Silica sol

First, performance
Silica sol is a colloidal solution that is odorless and non-toxic. The molecular formula can be expressed as mSiO2·nH2O. Since the colloidal particles are fine (10 – 20 nm) and have a relatively large specific surface area, the particles themselves are colorless and transparent, and do not affect the true color of the covering. The viscosity is low and the water can penetrate where it penetrates, so the dispersibility and permeability are very good when mixed with other substances. When the silica sol evaporates, the colloidal particles adhere firmly to the surface of the object, and the silicon-oxygen bond is formed between the particles, which is a good binder.
Second, use
Silica sol can be widely used in various industries due to its good adhesion, high temperature resistance, film forming property, gelation property, chargeability, large specific surface area, non-toxicity and odorlessness.
1. Precision casting
Due to its good adhesion, low shrinkage and its perfect glass phase conversion at high temperatures, silica sol is widely used as a shell binder in the precision casting industry.
2. Refractory materials
Silicate refractory fiber with silica sol as the main raw material is widely used as thermal insulation material for thermal and industrial equipment such as furnaces and kiln due to its excellent energy saving and high temperature resistance. Other amorphous refractories using silica sol as a binder, because they do not bring in various low-melting oxides, improve the use performance, and have high mold release strength, high temperature volume stability, high temperature thermal shock resistance, etc. advantage. In addition, acid-resistant cement or ceramics treated with silica sol can prepare chemical equipment resistant to strong acids, which can prevent acid penetration and withstand higher pressures.
3. Coating
A composite varnish with a silica sol as the main film-forming material and a synthetic cream liquid (such as styrene-acrylic emulsion, vinyl acetate resin emulsion) as an auxiliary film-forming material, plus pigments, fillers and additives, has unique water resistance, Refractory, washable and stain resistant, in recent years, has become a leader in architectural coatings.
The cast paint prepared by mixing the silica sol with the refractory powder can better prevent the molten steel from melting and the flat plate wear when casting the steel ingot.
4. Textile industry
The use of silica sol and wool treated with wool can improve the spinnability of the wool, reduce breakage, prevent flying, and improve the yield; used in the sizing of the light yarn, can improve the adhesion of the slurry, and is easy to fall. To shorten the drying time, etc.; added to the textile resin, the yarn can be slip-proof, the fabric is crisp, the dry feeling is felt, and the gloss of the fabric can be controlled. As a flocking additive, silica sol can greatly improve the antistatic ability of the fluff. In addition, silica sol can also be widely used in the treatment of various fabrics, regardless of various textiles and knitwear, or fabrics made of nylon, viscose, acetate, polyester, polypropylene, etc. , all have the advantages of matting, non-slip, wear-resistant, washable, anti-pollution, anti-static and so on.
5. Paper industry
Cellophane and plastic film are easy to stick in summer, and can be satisfactorily solved by treating with a mixture of silica sol and monostearyl glyceride. The photosensitive paper is treated with a mixture of a silica sol and a photosensitive liquid to make the photographic paper surface smooth, the image is sharp, and the exposure range is increased. It is used for pre-coating of printing paper, copy paper and offset paper, 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 sliding in transportation and storage can be reduced, and the moisture resistance of the paper product can be improved. In the manufacture of non-carbon carbon paper, the use of silica sol instead of clay, talc and carbon dioxide powder coatings makes the color more vivid. The punch card used in the electronic computer, after being coated with the silica sol, can have high stability and anti-slip property, and has good printability.
6.Battery industry
The silica sol is added to the electrolyte of the battery to form a gel with conductive properties, which can prevent leakage of the electrolyte, reduce pollution, and prolong the service life of the battery.
7. Catalyst industry
Using the large specific surface area and activity of the silica sol, it can also be used as a catalyst carrier,
8.Other
Silica sol can also be used as a water purifying agent, a clarifying agent, a dispersing agent for a tube coating, a semiconductor component polishing agent, and can also be used for processing carbon products, woven decorative articles, and reinforced foam rubber.
Third, packaging and storage
[Effective period]: Alkaline one year, acidic half year
[Package]: 25kg plastic drum or 250kg plastic drum.
[Storage and transportation conditions]: Keep the storage box at 0-40 degrees during transportation to prevent freezing and exposure.
Fourth,technical indicators