Silica sol has the advantages of small particle size, large specific surface area and good chemical stability. It has been widely used in automotive exhaust three-way catalytic equipment, thermal power plant exhaust gas denitrification catalytic device, petrochemical product catalytic production and other fields.

The silica sol catalyst has the following characteristics: (1) good catalyst stability; (2) High catalytic strength; (3) Good catalytic reactivity; (4) The catalyst has strong resistance to metal poisoning; (5) The pore structure and activity of the catalyst can be adjusted.

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The particle size of silica gel is generally 5~120 nm, which is much smaller than that of general lotion. When mixed with other substances, the dispersivity and permeability of silica gel are very good. Silica sol molecules attach to the surface of the substrate and filler particles. With the evaporation of water, SiO2? Dehydrate between H2O particles to form a solid Si-O bond cross-linked three-dimensional network coating. Therefore, the silica sol has a certain film-forming property

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Adding silane modified colloidal silica to silicate coatings is a natural method to ensure that various buildings can obtain more lasting protection and coloring. It can improve the durability, weather resistance and stain resistance of coatings. In this type of silicate coating, potassium silicate and colloidal silica are combined to form the main adhesive. The results show that this system has excellent adhesion, scrub resistance, stain resistance, high air permeability and good water resistance.

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Recently, the industrial silicon market has presented a situation of upstream and downstream deadlock. To be specific, at present, the downstream is not willing to receive goods, but the silicon factory has a strong sentiment of price fixing in the near future, and the willingness to sell at a lower price is low. At present, there are few low-cost sources of metal silicon. Although the demand for organic silicon has warmed up recently and the market confidence has been boosted slightly, the market transaction is weak, and there are few stock replenishment inquiries. At the same time, the operation space of relevant traders is also small. Therefore, the downstream is in a heavy wait-and-see mood, and the market transaction is dominated by just in need procurement, while the upstream and downstream remain deadlocked as a whole. On the whole, the market pessimism has subsided, and the trading volume of industrial silicon market has recovered from the previous two weeks. It is understood that the export market of industrial silicon has improved. The export of industrial silicon in June was 58400 tons, an increase of 0.74% month on month. The export rose slightly compared with that in May. The export volume in the first half of the year exceeded 350000 tons, and the annual export volume is expected to exceed 700000 tons. With the advent of the rainy season in the southwest region, all factories are producing in succession, and the operating rate is increasing. In the short term, with the increase of the silicon factory's inventory, the factory's willingness to ship is increasing. It is expected that the metal silicon will weaken in the near future.

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Inorganic silica sol is compounded with organic polymer lotion in the form of mixing or lotion polymerization, showing good coating characteristics and application prospects. With excellent performance and high ecological benefits, silica sol coating has a very large market and development potential at present.

Shandong Yinfeng supplies a variety of series of silica sols for inorganic coatings in the Chinese market, which can be customized according to customer requirements. They are mainly recommended for dark inorganic coatings and high-grade inorganic exterior wall coatings. At present, the product has excellent comprehensive performance, good use effect and stable quality, and is recognized and praised by the majority of users through mass use verification feedback.

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Silica sol is a transparent solution of silicon dioxide. Its appearance is sky blue or light white liquid. Its solid content is usually 15% - 30%. It is non-toxic, harmless, stable, and environmentally friendly. Charge neutralization is an important basis for the application of silica sol in the beverage industry as a clarifier or flocculant. In acid fruit juice and wine, silica sol with negative charge reacts with gelatin with positive charge to achieve the purpose of flocculation and clarification. One colloid can excite another colloid and make it easy to be precipitated by electrolyte. Mixing colloidal solutions with different charges can make it coprecipitate;

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The price of polysilicon material continues to rise

At present, the domestic polysilicon price continues to rise, with a slight increase in the ring ratio. The average price increase of single crystal compound feed, single crystal dense feed and single crystal cauliflower is about 1.6%. On the one hand, the orders of the top four polysilicon enterprises in China have been overbooked to the first ten or middle of July, and the remaining amount available for signing this month is very small. The current situation of silicon material supply shortage supports the continuous rise of silicon material price; On the other hand, in June, the total domestic polysilicon supply of individual enterprises was lower than expected due to power rationing or unplanned production stoppages. The lack of supply caused by temporary production cuts led to an increase in urgent orders and individual orders in the short term. Therefore, the current situation of insufficient silicon supply has intensified again, supporting the rise in market prices; At the end of the month, the domestic single crystal compound feeding price range was 268-2800 yuan/ton, and the average transaction price was 273100 yuan/ton; The price range of single crystal dense material is 266-27800 yuan/ton, and the average transaction price is 270400 yuan/ton.




Power restriction for polysilicon enterprises

In this month, one of the domestic polysilicon enterprises in production was cut down due to power restriction, and the other stopped production unexpectedly, which affected the output of about 3500 tons in total. It is expected that the domestic silicon output in June will be lower than expected. In July, there were three domestic enterprises with maintenance plans, namely Xinjiang GCL, Xinjiang Daquan and Dongfang Hope. In the same period, although Leshan GCL, Baotou Xinte, Baotou Tongwei Phase II and other expanded capacities were put into production, the contribution of supply increment was small. It is expected that the monthly output of domestic polycrystalline silicon in July will be flat month on month, much lower than the original expectation. In the third quarter, the demand for silicon materials by domestic silicon chip enterprises for incremental production expansion continued to increase, while the temporary maintenance plans of some domestic polysilicon enterprises increased over the same period. For the silicon material market, which is already in short supply, the overall shortage of supply in the industry will become increasingly prominent in the short term. The impact on the market price in the short term is mainly due to the fact that the long order supply of unplanned maintenance enterprises can not be met on time, and the sudden loose orders and urgent orders will increase accordingly. The expected atmosphere of the market supports the continued upward trend of silicon material price. At the same time, judging from the total supply and demand of silicon material in the third quarter, the current situation of phased oversupply of polysilicon will be slightly extended.

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Modified silica sol chromate free passivation agent is a kind of passivation agent that can significantly improve the performance of chromate free passivation film on the surface of hot-dip galvanized steel sheet (corrosion resistance, blackness resistance, yellowing resistance and painting performance). It can be widely used in hot-dip galvanized steel plants as an environment-friendly passivation agent product. The modified silica sol chromate free passivator has the advantages of simple production process, low cost and good stability, which is conducive to expanding production and has a very high industrial application prospect.

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A certain amount of potassium methylsilicate is added to the silica sol, and the potassium methylsilicate is combined with the silica sol to form a potassium silicate solution, which is not easy to gel: PMS-40 reacts with CO2 and H2O in the air to form potassium carbonate and methyl silicic acid, and the silicon hydroxyl group in methyl silicic acid is relatively active It can polymerize with hydroxyl groups on the surface of silica sol to form a three-dimensional network structure, and obtain a relatively dense coating. When burning, the film expands more obviously, which can play a good role in heat insulation and high temperature resistance.

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Corrosion of metal materials is a process of changing from active metal materials to non active oxides under the action of water, oxygen and other corrosive media in the service environment. The corrosion of metal materials causes huge economic and property losses every year. For example, the corrosion and leakage of oil pipelines, storage equipment and production facilities containing toxic and other harmful media will cause environmental pollution, and thus cause huge potential safety hazards and environmental damage.

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This month, the metal silicon plants in some regions of Sichuan are currently subject to the electricity price in the normal water period. Some plants will resume work after the overhaul at the end of April. At present, the number of furnaces opened in Sichuan is about 60, mainly for the production of oxygen free metal silicon and chemical grade 421 # metal silicon. Some metal silicon plants in Yunnan are in normal production, and the overall operating rate is expected to reach a high level in June. At present, the commencement of metal silicon in Yunnan is mainly focused on the centralized production in Baoshan, Nujiang and Mangshi districts. Yingjiang district in Dehong Prefecture will be put into centralized production in early June. In 2022, the output of silicon metal will increase on a year-on-year basis. In addition, the rainy season is coming, and the output may rise to a higher level. At present, most people are still bearish about the future market. Compared with the situation at the consumer end, China largely hopes to increase the consumption of polysilicon and organic silicon when new projects are put into operation. At present, the 1.1 million tons of new silicone projects planned to be put into production in the first half of the year have reached the production capacity successively, while the later new projects are put into production individually or at the end of the year; The new polysilicon projects currently have an annual capacity of no more than 100000 tons, and the subsequent projects of 300+10000 tons may be released successively in the third and fourth quarters. However, the market price of polysilicon continues to be high and the trend is encouraging. The factory maintains a high level of operation, and the consumption shows a significant year-on-year growth trend. Of course, the growth of metal silicon output may be relatively large.

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Chemo mechanical abrasive slurry is a key raw material required for chip production, which is used to grind the surface of wafers. This CMP slurry, called Optiplane, is manufactured by Rohm&Haas of DuPont in Taiwan and Japan. CMC Materials Company sued this slurry for infringement of patent rights, so ITC ruled that it was prohibited to import into the United States.



According to CMC, Optiplane slurry uses the advanced technology owned by Cabot Microelectronics of the company, that is, silicon dioxide particles are used in slurry to grind semiconductors. The slurry of Cabot series is called iDiesel.

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Waterborne silicate inorganic zinc rich anti-corrosive primer contains a large amount of zinc powder and is mainly used on steel substrate. Therefore, the chemical reaction of silicate coating applied on inorganic substrate containing a large amount of calcium and magnesium ions is different from that discussed previously.

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Silica sol coating is an inorganic coating made of colloidal silica aqueous dispersion as film-forming material, mixed with pigments, fillers and additives. The film forming material silica sol is a highly dispersed polysilicic acid with particle size of 1~100nm. The coating is composed of the base material silica sol and organic lotion (pure acrylic, styrene acrylic, vinyl acetate, chloroform and other lotion). The pigments and fillers are mainly composed of titanium dioxide, light calcium, talcum powder, and dispersants, film forming additives, thickening agents and other materials need to be added.

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The rise of metal silicon price is mainly supported by the increase of cost due to the tight price of raw materials, the decrease of supply due to the periodic maintenance of individual factories at the supply end and the environmental protection inspection or production reduction in Xinjiang, and the increase of consumption due to the coming into operation of new downstream organic silicon projects and individual polycrystalline silicon commissioning projects. Therefore, the large social inventory will not affect the rise of silicon price when the silicon factory has capital hoarding. At present, we can't ignore the fact that the increase and decrease of silicon plants in various regions are simultaneous, and the supply increases rapidly when it is profitable.

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The storage stability of the modified silica sol is obviously improved compared with that before modification, and the colloidal state can be quickly recovered after several freezing thawing cycles. The water-borne silicone rubber coating was prepared with methyl silicone rubber lotion as the matrix and modified silicone sol as the reinforcing filler. With the increase of silane coupling agent concentration, the interaction between silicone sol and methyl silicone rubber was strengthened, and the mechanical properties of the coating were improved; With the increase of the amount of modified silica sol, the crosslinking density and mechanical strength of the waterborne silicone rubber coating increased.

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Architectural coatings are a kind of coatings with the largest consumption proportion and the fastest growth rate. Architectural coatings are gradually developing towards water-based, functionalized and resource saving. At present, the common architectural coatings in the market are lotion coatings with vinyl acetate acrylic acid copolymer lotion, styrene acrylic acid copolymer lotion, and pure acrylic acid series as film formers. Waterborne lotion coatings with water as dispersion phase increase construction safety, The environmental pollution and toxicity to human body are reduced, but the raw materials of lotion are all from the limited resource of petroleum. Therefore, it is urgent to find a material with simple production process, sufficient sources, environmental friendliness and low cost to replace lotion and develop a new generation of water-based coatings with low VOC requirements and composite functions.

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The series of silica sol products customized and developed by Shandong Yinfeng for the application of thermal insulation and refractory materials have the characteristics of strong adhesion, good corrosion resistance, good thermal shock resistance, and high temperature resistance of 1600 ℃. They can be used as adhesives for refractories, thermal insulation materials, etc., so that the material has high strength, high temperature volume stability, good thermal shock resistance, and can also improve the oxidation resistance and slag corrosion resistance of products.

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Silica sol coating is an inorganic coating made of colloidal silica aqueous dispersion as film-forming material, mixed with pigments, fillers and additives. The film forming material silica sol is a highly dispersed polysilicic acid with particle size of 5-40nm. The coating is composed of the base material silica sol and organic lotion (pure acrylic, styrene acrylic, vinyl acetate and other lotion). The most common pigments and fillers are mainly composed of titanium dioxide, heavy calcium, talcum powder or kaolin and other natural mineral powders. At the same time, the stable inorganic coating formula also needs to add dispersants, film forming additives, thickening agents and other materials.

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In the communication with many customers and technologies who are engaged in architectural coatings, most people doubt that silica sol can not be used in architectural coatings, but a few technical experts have made it. Even if it is made into a small trial, it has not dared to go to a large production line. The reason is that there are too many uncertain factors, as shown below

报错
笔记

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Silicate glass is a high-energy, hydrophilic surface with poor stain resistance, low self-cleaning ability, and easy to adhere to water droplets and fog droplets. The cleaning of glass takes time and effort, which brings a lot of inconvenience to people's life and work. Therefore, the research on the hydrophobic film on the glass surface has attracted much attention.

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With the rapid development of economy, people's living standards have further improved. In home decoration, people generally use ceramic tiles to make the living environment more beautiful. But ceramic tiles also make the ground more smooth. If you accidentally sprinkle water and other liquids on the tiles, it is very easy to make people slip.

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Since the 21st century, with the development of economy, the domestic polishing industry has developed well. Local governments have issued relevant preferential policies to vigorously support the development of the polishing industry. As China becomes a new manufacturing center in the world, China is gradually becoming a global polishing application market. However, China is in the stage of optimizing and upgrading the industrial structure, so the demand for high-quality polishing liquid will become larger and larger, and the market space will be broad.

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Based on its nano scale advantages, the application scope of silica sol in the coating field has also been expanded year by year. The coating with silica sol has greatly improved its properties of heat resistance, cold resistance, electrical insulation, radiation resistance, weather resistance, contamination resistance and chemical corrosion resistance. The adhesion between coating and substrate will also be greatly changed after the introduction of silica sol. The coating and the substrate can be combined by mechanical bonding, physical adsorption, formation of hydrogen bond and chemical bond, mutual diffusion and other actions. The adhesion generated by these actions determines the adhesion between the coating and the substrate. In order to make the paint have good adhesion, it is necessary to consider the role of many factors.

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Commencement and output of metal silicon in Inner Mongolia

The power supply in Inner Mongolia is severely limited. Many factories that started this month said that their shipments were very small. Seeing the rapid growth of silicon metal, they could not start work normally. The factories are also like ants on a hot pot. In September, 14 of the 24 silicon metal ore smelting furnaces in Inner Mongolia were opened normally, 2 less than that in August, with an operating rate of 8.33% and a month on month decrease of 8.33%. It is estimated that the production capacity will be 12290 tons in September, with a capacity release rate of 73.90%. It is estimated that the monthly output will be 3770 tons and the month on month production will be 3770 tons. The factories in Bameng region said that the silicon metal will still be under dual control next month, and the operating rate of silicon metal in Inner Mongolia region is expected to decrease next month.


Energy consumption dual control should be one size fits all!

At the beginning of this month, the Development and Reform Commission of Yunnan Province issued the Notice of Yunnan Provincial Energy Conservation Leading Group Office on Firmly Doing a Good Job in Dual Control of Energy Consumption, setting strict requirements on the control standards of key industries such as steel, cement, yellow phosphorus and green aluminum. Among them, the production control measures for industrial silicon are to ensure that the average monthly output of industrial silicon enterprises from September to December is not higher than 10% of the output in August (that is, 90% reduction in output). According to analysis and statistics, Yunnan's industrial silicon output in August was 71000 tons. According to the spirit of the document, Yunnan's average monthly industrial silicon output from September to December was only 7000 tons, and the maximum output from September to December was only 29000 tons. The production capacity was almost halved!

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Organic polymer coatings (emulsion paint for interior and exterior walls) have been widely used in exterior and interior wall decoration of buildings due to their excellent mechanical properties, easy painting and low price. However, the fire resistance and weather resistance of organic polymer coatings are poor, and a large amount of organic compounds will be volatilized, which will cause great fire pressure to buildings, and cause harm and pollution to human body and environment.

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The nano inorganic silica sol prepared by Yinfeng Company with a special process is a modified product of nano silica. In addition to all the characteristics of nano silica, it has other different and more excellent properties. In the production process, it has greater application advantages than silicon dioxide powder, with the characteristics of convenient use, no dust pollution, convenient transportation, easy storage, etc.

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The adsorption process of water in concrete is considered to be one of the main reasons for corrosion of reinforced concrete reinforcement. Concrete must be modified with polymer to improve its waterproof performance and maintain its strength and durability.

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Waterborne coatings have been paid more and more attention due to their low VOC, environmental protection and energy saving. Nanotechnology provides strong technical support for improving the performance of waterborne coatings and upgrading the traditional industrial structure. The preparation and use of waterborne nano silica sol modified waterborne coatings are very convenient, which can be used after simple mixing. In this experiment, 3% KH560 modified silica sol Ludox CL was selected to observe its change in water resistance of aqueous lotion film. The modification results of several typical polymer water lotion with different amounts of modified silica sol are listed in Table 2.



The white emulsion is easy to absorb water and whiten after being soaked in water, with high water absorption rate and poor water resistance. After absorbing water, the membrane has no strength, so water resistance modification is often required. The water resistance of nano silica sol after surface modification with KH560 is obviously improved, the content of silica sol increases, and the water absorption decreases, but its water absorption is still high, and it is easy to whiten after long water absorption. The water resistance of styrene acrylic lotion and silicone acrylic lotion has also been significantly improved after composite, especially the latter. The water resistance of lotion curing film can be significantly improved by nano composite modification under low silicone content (silicone acrylic lotion is 3% of the weight of silicone monomer in silicone acrylate copolymer). The water absorption rate has decreased from 10% to 2.3%, and no whitening phenomenon can be observed after soaking at room temperature for 30 days. In addition, the silica sol nano composite modified waterborne coating also improves the hardness and adhesion of the film, and the UV aging resistance and scrub resistance of the film are also improved.

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At present, the preparation methods of silica sol/organic polymer lotion composite coatings are mainly divided into two categories: physical blending method and chemical lotion polymerization method.



The physical blending method is to add the silica sol into the polymer lotion to be miscible. The selection range of polymer lotion is wide, and the styrene acrylic, pure acrylic, silicone acrylic, vinyl acetate and other lotion (pH adjusted to 8.5~10) can be used. After the silica sol is physically miscible with the organic polymer lotion, the organic macromolecules in the lotion are evenly distributed in the gap of the "silicon oxygen silicon" inorganic coating, shielding the remaining hydrophilic groups in the inorganic coating, so that the coating has a certain elasticity. The coating thus formed has the characteristics of both inorganic and organic coatings, and makes up for the shortcomings of both. In theory, it is an ideal coating, However, the stability of their miscibility has always been a problem that is difficult to solve thoroughly. In order to solve the stability problem of silica sol/organic polymer lotion composite system, some researchers have proposed chemical lotion polymerization. The mechanism is organic polymer lotion polymerization in the presence of inorganic silica particles, so that the two can be compounded to obtain a stable composite polymer lotion. However, this method can only obtain silica and lotion products with low solid content at present, and its practicability still needs to be improved.

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First, silica sol is a non-toxic and tasteless liquid. Because of its small colloidal particles, the particles are colorless and transparent, which will not affect the original color of the covered objects. Most importantly, the material also has good permeability, and has the characteristics of silica sol when mixed with other objects.





Secondly, the silica sol process is simple. Yinfeng Company adopts a simple silicon hydrolysis process when making this material. The process has high requirements for the process and the produced particles have good uniformity.





Third, the silica sol has good performance. Because of its high temperature resistance and strong adhesion, it is widely used in the coating industry, casting industry and refractory binder industry.





Fourth, one of the biggest advantages of silica sol in the coating industry is its good material permeability, which can be well complementary to the coating. After material supplement, the coating has stronger firmness and anti-aging function.

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Anticorrosive coatings, as the main means of metal corrosion protection, are highly valued by all sectors of society.



Epoxy resin is widely used to prepare waterborne anti-corrosion coatings because it contains functional groups such as epoxy group, has strong adhesion, good corrosion resistance and other advantages. The waterborne epoxy coating system has the advantages of high adhesion, excellent corrosion resistance, good construction performance, good environmental protection performance and economic benefits, and is widely used in the industrial anti-corrosion field.

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The surface treatment of nano particles of silica sol can improve the performance of coatings by changing the surface structure; After surface treatment, silica sol can not only stably exist in waterborne coatings, but also improve many properties of films of different kinds of coatings. The application fields of silica sol in waterborne coatings are shown in the table

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The main difference between silica sols of different brands is particle size (divided into large particle size silica sols and small particle size silica sols) and pH value (divided into acid silica sols, neutral silica sols and alkaline silica sols). In addition, it is distinguished according to its purity (metal ion content), concentration, stable ion type (such as Na+, K+, NH4+), etc. In addition, there are some silica sols with special specifications

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Silica sol can be used as a binder to prepare amorphous refractories. As a bonding agent, silica sol is mainly used in ordinary castables, gravity castables, ramming materials and other amorphous refractories. The performance, production process and bonding mechanism of amorphous refractories have always been the focus of research, among which the use of castables of amorphous refractories is the largest and the most widely used.

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Silica sol is a colloidal solution composed of silicic acid macromolecular polymer, also known as silicic acid solution. Its molecular formula is SiO2. nH2O. The polymer particles are usually at 7~20 nm. There are different ways to prepare silica sol. Common methods include ion exchange method, one-step hydrolysis of silica powder, silane hydrolysis method, etc.

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Silica sol is the solvent of silicon dioxide, which belongs to a kind of polymer material and is widely used in various industries by users. What are the reasons why this material is widely used by users? Here is a brief introduction to several aspects, hoping that more users can understand the advantages of this material.



First, silica sol is a non-toxic and odorless solution. Because of its small colloidal particles and colorless and transparent particles, it will not affect the original color of the covered material. Most importantly, the material also has good permeability, and it also has the characteristics of silica sol when mixed with other objects.



Second, the silica sol process is simple. When Yinfeng Company made this material, it adopted the hydrolysis process of silicon. The process has high requirements for technology, and the produced particles have good uniformity.



Third, silica sol has good performance. Because of its high temperature resistance and strong viscosity, it is widely used in the coating industry, casting industry and refractory adhesive industry.



Fourth, one of the biggest advantages of the application of silica sol in the coating industry is that the material has good permeability and can be well complementary with the coating. After the materials are complementary, the coating has stronger firmness and anti-aging function.

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Adding silica sol in architectural coatings can significantly improve the thixotropy and can opening effect of coatings, prevent coating sagging, and enhance the construction performance, especially improve the hydrophobicity of the coating film, greatly improve the anti fouling property of coatings, and have excellent self-cleaning performance. During the drying process of the film, SiO2 particles in the silica sol disperse to form a Si-O-Si network structure, which can improve the permeability, aging resistance and other properties of the film.



There are many kinds of silica sol and polymer lotion, and their properties are different. In some cases, the compatibility between the two is poor, and mechanical blending is easy to delaminate. This is because the interface between the two lacks affinity. Improving the interface affinity between the two is the key factor to solve the organic/inorganic compatibility. In some mixed systems, silica sol and polymer lotion are directly compounded by blending method, which can not achieve the expected modification effect, and may even lead to the decline of the performance of polymer lotion; By modifying the silica sol, it can be better compatible with the polymer lotion to expand the scope of application of silica sol.



The specially modified silica sol can make the coating performance more excellent, no matter in the film hardness, adhesion, or paint stain resistance, water resistance have been significantly improved. The silica sol system has better dispersion and wider application than nano SiO2 powder.

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UV curable waterborne wood coatings use water as solvent, which reduces the cost of coatings and VOC content; With the advantages of fast curing speed, low energy consumption, low pollution, green environmental protection and energy conservation, and high production efficiency, it is suitable for assembly line production and widely used in electronic components, printing, glass, wood coatings, construction, wood and other industries.

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Silica aerogel is the lightest solid material in the world, and it is also a special porous material,



It is a light blue transparent solid from the macro point of view, and a unique three-dimensional grid skeleton from the micro point of view



The framework structure is composed of loosely packed bonded silica particles. The good properties of silica aerogels include high specific surface area (400~1500m2 · g-1), high porosity (80%~99.8%), high visible light transmittance (>90%), low refractive index (<1.01), low dielectric constant (1.0~2.0), low sound velocity (100 m · s-1) and low thermal conductivity (<0.02 W · m-1 · K-1).

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In 2020, the supply and demand pattern of metal silicon has changed unprecedentedly under the influence of the COVID-19. The output has gradually shrunk, and the consumption has shifted from exports and the aluminum market to relying on polysilicon and organic silicon industries. At present, the impact of the epidemic situation is gradually decreasing. Is there any new opportunity for the development of the metal silicon industry? Is the production pattern changing again? Can overseas demand still occupy the first consumption? How about polysilicon and organic silicon expansion?

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With the gradual depletion of oil resources, the development of traditional petroleum based sound absorbing materials (such as polyurethane foam, polystyrene foam) is gradually restricted, so it is particularly important to develop green and environmentally friendly sound absorbing materials. Plant fiber is a kind of natural and degradable biomass material, which widely exists in natural plants and has abundant reserves. Rational utilization of this kind of resource can reduce the dependence of human beings on non renewable raw materials such as petroleum.

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Silica sol is a dispersion of nano silica.



The composition of silica sol is relatively simple, mainly including nano silica particles and dispersion medium. Therefore, the particle size of silica sol is a particularly important indicator. At present, the particle size of silica sol on the market is about 5nm-120nm.



The particle size of silica sol can be measured by the following methods:

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Silica sol is a colloidal system formed by the dispersion of amorphous silica nanoparticles in water. It is non-toxic and tasteless. It is one of the few nano materials that can realize large-scale industrial production and has a wide range of uses.

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Superhydrophobic surface usually refers to the surface with a contact angle of more than 150 ° between materials and water. Super hydrophobic textiles have excellent waterproof, anti pollution, self-cleaning, durability and other characteristics, and are widely used in protective clothing, shoes, tents, sleeping bags and other aspects.

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硅灰对灌浆料的性能会产生多方面的良好效果。无定形和极细的硅灰对高性能灌浆料有益的影响表现在物理和化学两个方面：起超细填充料的作用；在早期水化过程中起晶核作用，并有高的火山灰活性。

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Silica sol is the dispersion of nano silica particles in water or solvent, which is not specified as dangerous transport goods in the world, so it is suitable for land, sea and air transport.

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Silica sol refers to the dispersion system of nano silica particles in water or solvent. There are many excellent properties, such as large specific surface area, high adsorption, high dispersion (several nanometers to tens of nanometers), high fire resistance and thermal insulation. As SiO2 in the silica sol contains a large amount of water and hydroxyl, the silica sol can also be described as SiO2 · nH2O. Silica sol is widely used because of its many excellent properties.

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Small particle size silica sol has a wide range of good effects in product application. Due to its strong activity, small particle size silica sol should be properly preserved during use. If the preservation is not done well, the function of the product will be affected.

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Although silica sol shell cracking is rare, it occasionally occurs. According to the analysis, the surface of the shell is partially separated from the wax mold and lifted outwards, or the post coating flows between the wax mold and the surface after lifting, but the gap is not filled, and then the product sticks to the skin.

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Waterproof: nano silica sol particles have good permeability, penetrate into the pores on the surface of the substrate, block the pores, reduce the number of open pores, increase the number of closed pores, so as to inhibit and reduce the absorption of coating water by the base layer, making the absorption become very uniform, the drying become even, increase the density of the coating, and improve the waterproof ability.

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Acrylic resin has the advantages of good film-forming property, good color retention, high gloss, excellent adhesion, etc. Acrylic resin coatings have excellent weather resistance, pollution resistance and solvent resistance, and are widely used; However, there are some defects such as low hardness, poor adhesion, poor mechanical strength and poor thermal stability, which limit further application. Through modification, relevant properties can be improved. Silica sol is a colloidal solution of silicic acid macromolecular polymer, which has the characteristics of non-toxic, high hardness, good mechanical strength, and good heat resistance. However, it is a hydrophilic inorganic phase, and it is difficult to directly interact with organic monomers. At the same time, it has the disadvantages of easy cracking of the coating film. The silane coupling agent in the organic silicon is a kind of silane containing two groups with different chemical properties in the molecule at the same time. The end containing the siloxane bond can easily interact with the surface of the silica sol. Through the bridging effect of the organic silicon, the silica sol of the inorganic phase can be grafted onto the acrylic resin to prepare the inorganic organic modified acrylic resin composite, and improve the hardness, adhesion, impact resistance and other properties of the acrylic resin.

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Cement based materials are the most widely used building materials at present, but buildings built with cement based materials are often damaged to varying degrees before reaching the design service life, resulting in huge maintenance, reinforcement, demolition and reconstruction costs. In order to prolong the service life of buildings, we should not only pay attention to the mechanical properties of cement-based materials, but also pay attention to their durability, and find ways to effectively improve the performance of cement-based materials.

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Cement based materials are the most widely used building materials at present, but buildings built with cement based materials are often damaged to varying degrees before reaching the design service life, resulting in huge maintenance, reinforcement, demolition and reconstruction costs. In order to prolong the service life of buildings, we should not only pay attention to the mechanical properties of cement-based materials, but also pay attention to their durability, and find ways to effectively improve the performance of cement-based materials.

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It is estimated that the total installed capacity of global solar thermal power generation will reach 42GW in 2020 and 200GW in 2030. According to the construction cost of 2500 dollars per kilowatt, its industry can reach 3.2 trillion yuan!

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杨木是我国人工林的主要树种，但因材质软、强度低等缺点限制了其使用，需进行提质增值加工来拓宽应用范围。研究表明，用无机物与木材结合制备无机复合木材，其密度、抗弯强度和阻燃等性能均可以得到明显改善。硅溶胶具有黏度低、粒径小的特点，能够有效渗入木材孔隙结构中，经过凝胶、干燥后得到稳定的空间结构和较高的硬度；硅溶胶安全环保，无游离甲醛，具有较好的热稳定性和生物相容性，是一种很好的木材改性剂。

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Silicone rubber is a linear polysiloxane with high molecular weight, good flexibility and outstanding heat resistance. It is widely used as the basic polymer of coatings, but its mechanical strength is poor. It can be used only after being reinforced by reinforcing filler. With the enhancement of people's environmental awareness, waterborne silicone rubber coating has become a development trend. Silica is often used as reinforcing filler of liquid silicone rubber, but its compatibility with water system is poor, so it can not play a very good reinforcing role in water-based silicone rubber coating system. Silica sol is a silica gel in the form of water dispersion, with a large number of hydroxyl groups on the surface, which is well compatible with the aqueous system. Moreover, the silicon hydroxyl groups on the surface of silica particles can form a hydrogen bond with silicone rubber, thus playing a very good reinforcement effect.

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Calcium silicate board is a new type of building and industrial board made of calcium materials, siliceous materials, reinforced fiber materials, additives, etc., which are mixed in a certain proportion through a series of processes. It belongs to incombustible A1 grade material. It has the advantages of moisture resistance, weather resistance, heat insulation and sound insulation, high strength, long service life, non moth, non corrosion, etc. It is an ideal decorative board for ceiling and partition, It has broad development prospects. However, it is easy to be damaged and needs certain protection.

The heat resistance, hydrophobicity and mechanical properties of calcium silicate board can be improved by spraying silica sol coating on its surface.

Silica sol, also known as silicate solution, has a relatively large specific surface area, small colloidal particles, low viscosity, good dispersion and permeability. However, because the stiffness of the silicon oxygen bond is not enough to make the gel skeleton resist the capillary pressure generated by the volume contraction during drying, it is easy to form microcracks or even large cracks during the film forming process. In order to make up for these defects, the hardness, heat resistance, water resistance and pollution resistance of the coating film can be improved by modifying the silica sol.

Chen Lijun et al. studied the modification effect of different content of methyl triethoxysilane on silica sol at different temperatures. At the same time, hydrophobic films were prepared on the glass surface by immersion and gravity methods. After coating, the optical properties of the glass surface did not change significantly, but the hydrophobicity was greatly improved. Liu Jianxiang and others modified the methanol silica sol with methyltrimethoxysilane and methylethoxysilicone oil, and found that the hydrophobic modified silica sol had a greater impact on the mechanical properties of the acrylic coating. Ren Zhiwei et al γ- Glycidyl ether oxypropyl trimethoxy silane and methyl trimethoxy silane co hydrolyze to modify the silicon aluminum composite sol under acidic conditions, and add amine curing agent to prepare room temperature curable organic-inorganic hybrid polysiloxane coating.

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The primary purpose of most corrosion resistant coatings is to protect the substrate from corrosion. Due to the limitations of organic coatings such as poor temperature resistance and weather resistance, phosphate inorganic coatings, as an important component in the field of inorganic coatings, have received extensive attention. Phosphate inorganic coatings are colorless and tasteless, with excellent high temperature resistance (heat resistance temperature up to 1300~1600 ℃) and anti-corrosion performance. They can replace organic compounds as the matrix of ablation resistant materials; At the same time, the utility model has the advantages of good water resistance, high bonding strength, good metal adhesion, low cost, less pollution, non flammability, non explosion, etc.

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In order to improve the comprehensive performance of polyacrylate lotion and make it more widely used, it needs to be modified. The main existing technology is to directly modify it with organosilicon, but the organosilicon is easy to hydrolyze and cross link, so the silicon content of the silicone acrylic lotion produced is very low, and it is not obvious to improve the hardness, scratch resistance and water resistance of acrylate lotion coatings. The addition of SiO2 sol in the lotion polymerization process to synthesize organic-inorganic composite lotion can solve these problems. The content of silicon in the synthesized composite lotion is generally high. Nano-SiO2 particles are evenly dispersed into the acrylate lotion in an appropriate way, which can overcome the low hardness, poor wear resistance and heat resistance of the current acrylate lotion coating. It is a research hotspot in the field of acrylate lotion coating modification.



Organic polymer and inorganic SiO2 particles form strong chemical bond with each other under the action of organic silane coupling agent to obtain composite structure polymer. The research shows that when polymerization and grafting are carried out in the same reaction system, the organic polymer is immediately attracted to the surface of nano SiO2 particles under the action of free radicals after the completion of polymerization under the action of initiator, so that the functional groups of the organic polymer and inorganic nano particles form a chemical bond, and the organic polymer is grafted to the surface of inorganic particles; At the same time, the organic polymer continued to grow under the action of the initiator, so that the surface of the inorganic silica sol was coated by the organic phase.



During the synthesis of organic-inorganic composite lotion, electrostatic adsorption, adsorption layer mediation or graft reaction (chemical bonding) will be used to improve the interface bonding between organic and inorganic phases. According to the electrostatic interaction between different lotion polymerization components and inorganic substances, there are mainly two types: one is the interaction between monomers involved in polymerization and inorganic substances, and the other is the interaction between initiators and inorganic substances. Due to its own charge, organic polymers can coat inorganic particles on the polymer surface with the help of electrostatic interaction with inorganic particles with opposite charges. At the same time, the electrostatic effect can also make the inorganic particles coated with polyelectrolyte to obtain composite polymer coating. The organic-inorganic composite polymer formed by electrostatic adsorption has the advantages of easy control of reaction, multiple types of organic phase polymer and inorganic phase particles, etc.

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