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Wide application of silica sol

Author:MikeSource:DongYing YiMing New Materials Co.,LtdLink:

1. Application of silica sol in precision casting

Silica sol is mainly used as a binder for precision casting coatings and can be used as surface coating and reinforcement coating for mold shells. Applying small-particle silica sol to precision casting instead of ethyl silicate can not only reduce costs, but also improve labor conditions. When used in precision casting of thin shells, the shell can have high strength, high dimensional accuracy, good casting finish, better shape than water glass, and is cheaper than ethyl silicate. It is especially suitable for large castings, castings with high surface finish requirements and castings with no or small margins. Using silica sol as a high-temperature resistant coating for casting molds can make the coating have good heat resistance and wear resistance, reduce the loss of molten metal to the mold at high temperatures, and facilitate demolding.

2. Application of silica sol in textiles

In the textile industry, fabrics treated with silica sol have high strength, stable fabric dimensions, and high recovery elasticity. The combined use of silica sol and synthetic wool oil increases the cohesion between fibers and increases the tensile strength, which improves production efficiency and can Spin high count products.

During the wool spinning process, silica sol is used as an additive for spinning sizing to reduce the breakage rate of wool fibers. Titanate fiber and silica sol are included in the coating to increase the surface heat resistance strength of the inorganic fiber material. The dosage of silica sol is generally controlled at 2 to 5%. The best adding state is when wool and fine short hair are first added, but the silica sol contains a certain amount of moisture, which must be calculated into the moisture regain on the machine.

Adding silica sol to the diameter yarn sizing can reduce breakage and save sizing; when using fine-grain rolling or twisting sizing, add silica sol to polyvinyl alcohol, carboxymethyl cellulose, natural starch, oil and other materials In the slurry, the radial yarns can be separated easily, and the yarns are anti-slip and continuous. The woven nylon fishing net has a strong knot and is not easy to slide and loosen; the nylon rope treated with silica sol can increase the friction between the single filaments. It is anti-slip and can reduce its elongation; bedding materials made of synthetic fibers are generally smoother. If you use fibers treated with silica sol, you can get a bedding that is fluffy, elastic and non-slippery. Treating chemical fibers with silica sol can also obtain a matting effect.

Silica sol can also be used in fabric dyeing. Because it has adhesive properties and can form an excellent protective liquid, it helps the pigment adhere to the surface of the fabric, increases the uniformity and fastness of dyeing, and prevents pigment aggregation; add silica sol with 60% of the pigment amount to the starch glue. Used to treat fabrics, such as carpets, etc. After treatment, they can be anti-slip, dust-proof, prevent static electricity, and do not stick to dust.

Nylon yarn is dipped in 5% silica sol solution and knitted into socks, which can prevent or reduce the generation of burrs. In short, the range of fabrics that can be treated with silica sol is very wide. Regardless of various textiles and knitwear, as well as fabrics made of nylon viscose fiber, polyester, acetate fiber, polypropylene, etc., it can be treated with good results.

3. Papermaking

When producing man-made fibers and cellophane, silica sol is used as a binder to prevent adhesion and entanglement between films; photosensitive paper is mixed with silica sol and photosensitive liquid to make the surface of the photosensitive paper smooth, the image is clear, and the photosensitive paper is enhanced. Large exposure range, making one-step imaging paper; used as a pre-coat for printing drawings, copy paper and offset printing, which can make the paper surface smooth, the image contrast is clear, and the contrast is good. After the surface of kraft paper and corrugated paper is treated with silica sol, the slip resistance of the paper can be improved, the slippage during transportation and storage can be reduced, and the temperature resistance and strength of the paper product can be improved; silica sol can be used to replace clay and talc in the manufacture of non-carbon copy paper. Powder and silica powder coating can make the color more vivid; plastic film and cellophane are easy to become sticky in summer. If treated with a mixture of silica sol and glyceryl monostearate, it can be successfully solved. The perforated paper used in electronic computers can be coated with silica sol to have high stability, anti-slip properties, and good printability.

4. Catalyst

In catalyst production, silica sol acts as a carrier under certain conditions to accelerate the catalytic speed and improve production efficiency. Its advantage is that it has no other by-products, salts, etc., and can obtain a certain specific surface area. At the same time, it has high SiO2 content, high processing rate, and is very good in terms of selectivity and activity. Silica sol with a SiO2 concentration of 40% has been successfully used to produce the carrier of acryl cyanide catalyst C-41. Others include benzene oxidation as a carrier for maleic anhydride, synthesis of methyl methacrylate, chlorination of hydrocarbons, dehydrogenation of alcohols, etc., which can be used as carriers. Industrial production often has different requirements for catalyst carrier particle size, specific surface area, pore diameter, pore volume and stiffness. For example, in fixed bed reactions, due to limitations of fluid resistance, large particle carriers are required; in sulfurized beds, fine particle carriers are required to improve efficiency; molybdenum and bismuth catalysts used for propylene ammonia oxidation require carrier particles The diameter is about 50 microns; the microsphere catalyst used for catalytic cracking of petroleum fractions requires a particle size of about 60 microns.

5. Silica sol is used to make silicon balls

There are inorganic particles of silica sol (SiO2) in the mixture of urea and formaldehyde. Due to the copolymerization of the organic matter urea and formaldehyde, the urea-formaldehyde copolymer and the colloidal particles in the solution copolymerize to form spherical particles.

6. Oil

Using silica sol as a monomer catalyst in the production of aromatic cyanide has opened up a new way to improve the recovery rate of aromatic cyanide. Silica sol is used in several petrochemical complex units introduced in my country. In the petroleum industry, silica sol is used as a binder and catalyst.

7. Paint

Silica sol is widely used as exterior wall building coating. It has the advantages of water resistance, weather resistance, fire resistance, stain resistance, high temperature resistance, high film hardness, bright color and non-fading. It can also be used for acid-resistant, alkali-resistant, fire-proof, water-releasing coatings and infrared radiation coatings.

8. Enamel

In the manufacture of enamel, adding silica sol can reduce the expansion coefficient to improve adhesion to tetrafluoroethylene. By mixing 25 to 30% silica sol into glass, high-quality borosilicate glass can be obtained.

9. Battery

The electrolyte of lead-acid batteries, sulfuric acid, easily overflows when cars, tanks and other motor vehicles make sharp turns. If a certain amount of silica sol is added to the sulfuric acid to gel it, it can prevent sulfuric acid from leaking and overflowing, and extend the life of the battery. .

10. Metal

Silica sol can be used to prevent white embroidery on galvanized sheets. Insulating film treatment of electromagnetic steel plates, sealing treatment of anti-corrosion aluminum, surface grinding treatment, and oxidation inhibitor during heat treatment.

11. Steel rolling

Adding a certain amount of silica sol to the coating solution can improve the appearance, insulation performance, and heat resistance of the insulation coating, reduce the expansion coefficient of the coating material, and improve the magnetism of silicon steel.

12. Broadcasting equipment

Silica sol can be used as a coating for bonding picture tubes in TV sets; when making transformer cores, it can be used as a binder to bond silicon steel sheets into one body, and it also plays the role of insulation, high temperature resistance, and raising the melting point. The effect is very good.

13. Using silica sol as far-infrared radiation coating has good adhesion, high temperature resistance, and does not affect radiation.

14. Use silica sol as a binder for ceramic fibers, impregnate the aluminum silicate fiber felt with silica sol, add a coagulant, and make a warm felt. It can be used as a thermal insulation refractory material and as a surface adhesive for refractory bricks in high-temperature furnaces. Binder, high bonding strength, high temperature resistance (above 1000℃), energy saving, it is economical and convenient to modify the furnace.

15. Semiconductor original polishing agent

Using large silica sol as a single crystal silicon polishing agent not only has good effect, but also has fast polishing speed.

16. Reinforced foam rubber

Natural rubber and most synthetic rubbers, such as styrene-butadiene rubber, neoprene and mixed rubber, can be reinforced with silica sol. Adding 5% silica sol to dry rubber can strengthen the porous foam rubber by 20%; for a certain volume of rubber, 20% of the rubber can be saved due to the increased elasticity, and adding silica sol during the beating operation can also Improves foam performance and produces more stable wet foam. In addition, foam rubber can also be prepared first and then treated with silica sol.

17. 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 effects.

18. Carbon products treated with silica sol can reduce losses caused by surface oxidation.

19. The pollution resistance of chemical fiber decorative items treated with silica sol can be doubled. It can be seen that silica sol is also an effective antifouling agent for surfaces such as wall coverings.

20. The anti-slip floor wax made from silica sol is well-known in industry and civilian use. The small SiO2 particles adhere to the wax film on the floor surface, which has good anti-slip effect and does not affect the soft luster.

21. Silica sol is an excellent water purifier. After it is mixed with aluminum sulfate, it can condense and remove metal salts and suspended matter in the water.

22. Adding a small amount of silica sol to fuel oil can prevent combustion ash from accumulating on the diesel engine.