– Characteristics of silica sol
1. Silica sol has greater absorptivity: the innumerable network structure voids produced by countless micelles in silica sol can produce certain adsorption effects on inorganic and organic substances under certain conditions.
2. The specific surface area of silica sol is larger: generally: 150-300M2/g.
3. Good cohesion of silica sol: Because its micelle size is uniform, about 10-20m/u, it will produce certain bonding strength when air-dried, but the strength is relatively small. If the silica sol is added to a certain fibrous or granular material, and then dried and solidified, it becomes a firm gel structure. Will produce greater adhesion. (Generally 46.7kg/cm2)
4. Silica sol has good temperature resistance: generally, it can withstand high temperatures of about 1600°C.
5. Silica sol has good hydrophilicity and strong oil repellency: it can be diluted to any concentration with distilled water or ion-free pure water, and the stability increases with the increase of dilution; when organic matter or multiple metal ions are added, it can produce oil repellency.
6. In addition, silica sol has high dispersibility, good abrasion resistance, and good light transmittance. It can be used as a good dispersant, antiseptic, flocculant, coolant, etc.
– Silica sol use for
1. Used in the precision casting industry: instead of ethyl silicate, it is non-toxic. It can not only reduce costs, but also improve operating conditions, high dimensional accuracy, good casting finish, and can make the shell stronger and better shaped than using water glass. The high-temperature resistant coating used in the casting mold can make the coating have better heat resistance, reduce the loss of molten metal to the mold at high temperature, and facilitate demolding.
2. Application in the coating industry: It can make the coating firm, with the advantages of water resistance, fire resistance, stain resistance, high-temperature resistance, high hardness of the paint film, bright color, and no fading. It can also be used for acid-resistant, alkali-resistant, fire-resistant coatings and far-infrared radiation coatings.
3. Adhesive for refractory materials: It has the characteristics of high bonding strength and high-temperature resistance (1500-1600℃).
4. Application in the textile industry: It can be used as a sizing aid for radial spinning to reduce the rate of end breakage. Used for fabric dyeing. Because of its cohesive force, it can form an excellent protective solution and increase the adhesion of dyeing.
5. Paper industry: used as a processing agent for photosensitive paper and anti-sticking agent for cellophane; after processing other office paper, it can improve the printing effect and make the color more vivid.
6. Applied to catalysts: In the production of catalysts, under certain conditions, it can be used as a carrier to accelerate the speed of catalysis and improve production efficiency.
7. Petroleum application: In the production of aromatic nitrile, a silica gel monomer is used as a catalyst to open up a new way to increase the recovery rate of aromatic nitrile. In the petroleum industry, silica sol is used as a binder and catalyst.
8. Application in batteries: Ordinary lead-acid batteries have a short service life. If you use this product, it can be configured as the electrolyte of a solid battery, which greatly improves the service life of the battery. At the same time, ordinary electrolyte sulfuric acid is easy to overflow when a motor vehicle makes a sharp turn. The use of solid battery electrolytes can solve this problem. Effectively prevent the leakage and overflow of sulfuric acid and avoid environmental pollution.
9. Application in steel rolling: adding a certain amount of silica sol to the coating solution can improve the appearance, insulation performance, and heat resistance of the insulating coating, and can reduce the expansion coefficient of the coating, and improve the magnetic properties of silicon steel.
10. Application in enamel: In the manufacture of enamel products, after adding silica sol, the expansion coefficient can be reduced and the adhesion of tetrafluoroethylene can be improved. 25-30% silica sol can be added to the glass to obtain high-quality borosilicate glass.
11. Application in broadcasting equipment: Silica sol can be used as an adhesive for TV picture tubes; when making transformer cores, use it as an adhesive to bond silicon steel sheets into a whole, which can provide insulation and high-temperature resistance. effect. , Good results.
12. Application in ceramic fiber: the aluminum silicate fiber is impregnated with silica sol, and coagulant is added to make a warm adhesive, which is used as a thermal insulation material; as a surface adhesive for refractory bricks in high-temperature furnaces, with high bonding strength. High temperature resistance (above 1000°C), energy-saving, and it is economical and convenient to reform the furnace.
13. Polishing agent for semiconductor components: using large-particle silica sol as a polishing agent for single crystal silicon, not only has a good effect but also has a fast polishing speed.
14. Application in foam rubber: adding 5% silica sol to dry rubber can increase the strength of porous foam rubber by 20%. For a certain volume of rubber, 20% of rubber can be saved due to the increase in elasticity.
15. Silica sol can be used as a clarifying agent for soy sauce and rice wine without affecting the color, aroma, and taste. Silicon is non-toxic to the human body and has certain anti-cancer and anti-cancer effects.
16. After chemical fiber decorations are treated with silica sol, the pollution can be reduced by two times. It can be seen that silica sol is also an effective antifouling agent on the surface of wall decoration cloth.
17. The anti-skid floor wax made of silica sol has been used in industry and civil use and has a good anti-skid effect without affecting the gloss and softness.
18. Silica sol is an excellent water purifier. After being mixed with aluminum sulfate, it can condense and remove the metal salt and suspended turbidity in the water.
19. Add a small amount of silica sol to the fuel to prevent the ash after combustion from accumulating on the diesel engine.
20. Using silica sol as a binder for far-infrared radiation coatings is good, resistant to high temperatures, and does not affect radiation.
Post time: Dec-07-2021
