White carbon black  CAS 10279-57-9 is the general term of white powder X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica, fumed silica and ultra-fine silica gel, as well as powder synthetic aluminum silicate and calcium silicate. White carbon black is a porous substance, and its composition can be represented by SiO2 · nH2O, where nH2O exists in the form of surface hydroxyl groups. Soluble in caustic soda and hydrofluoric acid, insoluble in water, solvents, and acids (excluding hydrofluoric acid). High temperature resistance, non flammable, odorless, odorless, and excellent electrical insulation.

Chinese name: White carbon black

Foreign name: Silica

CAS number: 10279-57-9

EINECS number: 238-878-4

Physical and chemical properties

physical property

Appearance: White powder or granular or irregular blocks.

True density: approximately 2.0g/mL

False density: approximately 0.2g/mL

High temperature resistance, non combustible, and good electrical insulation.

chemical property

Can react with caustic soda: SiO2 · nH2O+2NaOH=Na2SiO3+(n+1) H2O

Can react with hydrofluoric acid: SiO2 · nH2O+4HF=SiF4+(n+2) H2O

Purpose

Due to the series of advantages of white carbon black products, it can be widely used in many fields.

Rubber products

White carbon black is used in colored rubber products to replace carbon black for reinforcement, meeting the needs of white or semi transparent products. Silica also has super adhesion, tear resistance, heat resistance and aging resistance, so it can also replace part of carbon black in black rubber products to obtain high-quality rubber products, such as off-road tires, engineering tires, radial tires, etc.

Agricultural chemicals

In agricultural chemicals, such as pesticides and high-efficiency spraying fertilizers, using white carbon black as a carrier or diluent or disintegrant can improve the suspension rate when used as an disintegrant in the water dispersible particle agent WDG. It is recommended to use a content of about 10%. It can maintain long-lasting efficacy due to its extremely high surface area, high adsorption capacity, easy suspension, good affinity, and chemical stability. Even under rain, flushing, and hot conditions, it can remain unchanged for a long time.

Daily chemical products

Transparent colored and opaque toothpastes with white carbon black as filler and abradant have good flexibility, dispersibility, smoothness, softness, good abrasiveness, and do not abrade the toothpaste tube; It can maintain the stability of medicinal toothpaste. Especially with fluoride, it has good compatibility and can avoid the disadvantage of insoluble salts produced by calcium salts as abrasives.

Cementitious agent

Used in adhesives made of natural rubber or synthetic rubber, it provides thixotropy and reinforcement, while also improving adhesion due to its extensibility, making it high-quality and cost-effective.

Anti caking agent

White carbon black can be used in some products to improve free flow, such as grassland fertilizers, fungicides, grinding wheel abrasives, laundry bleach, phenolic injection molding of urotropine, plastic products of phenol and urea, manufacturing of rubber sulfur and anti caking mixtures.

Paper filler

Using white carbon black as a paper filler can improve the ink penetration resistance and mechanical strength of the paper, increase whiteness, and reduce unit weight. It can effectively achieve paper lightweight, reduce production costs, and improve paper performance.

In addition, it can also be used in many industries such as fire extinguishing agents, feed, cosmetics, matting agents, pigments, paints, etc.

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