White carbon black is a general term for white powder X- ray amorphous silica and silicate products. It mainly refers to precipitated silica, fumed silica, ultrafine silica gel and aerogel, including powdered synthetic aluminum silicate and calcium silicate. Silica is a porous material, and its composition can be SiO2 & middot; NH2O, where nH2O exists in the form of surface hydroxyl groups. Soluble in caustic soda and hydrofluoric acid, insoluble in water, solvents and acids (except hydrofluoric acid). High temperature resistance, nonflammable, tasteless, odorless, with good electrical insulation.
component
According to the production method, white carbon black can be divided into precipitation white carbon black and gas phase white carbon black. Under normal conditions, fumed silica is white amorphous flocculent semi silica transparent solid colloidal nanoparticles (particle size less than 100nm), non-toxic and has huge specific surface area. Fumed silica is all nano silica, the purity of the product can reach 99% and the particle size can reach 10 ~ 20 nm, but the preparation process is complex and expensive; Precipitated silica is also divided into traditional precipitated silica and special precipitated silica. The former refers to silicon dioxide produced by sulfuric acid, hydrochloric acid, CO2 and sodium silicate as raw materials. The latter refers to silica produced by special methods such as high gravity technology, sol-gel method, chemical crystal method, two crystallization method or inverse micelle microemulsion method. Precipitated silica is mainly used as reinforcing agent for natural rubber and synthetic rubber, toothpaste friction agent, etc. Fumed silica is mainly used as reinforcing agent, coating and unsaturated resin thickener for silicone rubber. Ultrafine silica gel and aerogel are mainly used as paint matting agents, thickening agents, plastic film openings, etc.
purpose
Due to a series of advantages of silica 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 to meet the needs of white or translucent products. White carbon black has strong adhesion, tear resistance, heat resistance and aging resistance at the same time, so it can also replace some carbon black in black rubber products to obtain high quality rubber products, such as off-road tires, engineering tires, meridian tyres and so on.
Agricultural chemicals
In agricultural chemicals, such as pesticides and high-efficiency spraying fertilizers, using white carbon black as carrier or diluent can maintain long-lasting efficacy, because it has high adsorption capacity, easy suspension, good affinity and chemical stability. It can remain unchanged for a long time even under rain, flushing and hot conditions.
Daily chemical products
Transparent color and opaque toothpaste with white carbon black as filler and abrasive. This kind of toothpaste has good flexibility and dispersion. The paste is smooth, soft and has good abrasiveness. It does not abrade the toothpaste tube; It can keep the drug toothpaste stable. In particular, it has good compatibility with nitrides, which can avoid the disadvantage of insoluble salt produced by calcium salt as abrasive.
Cementing agent
It is used in the adhesive made of natural rubber or synthetic rubber to provide thixotropy and reinforcement. At the same time, due to its extensibility, it can also improve the adhesion, high quality and low price.
Anti caking agent
White carbon black can be used in some products to improve free fluidity, such as grassland fertilizer, fungicide, grinding wheel abrasive, laundry bleach, phenolic injection molding Urotropine, plastic products of phenol and urea, manufacturing rubber sulfur and anti caking mixture.
Papermaking filler
Using white carbon black as paper filler can improve the ink penetration resistance and mechanical strength of paper, increase whiteness and reduce unit weight. It can effectively realize the lightweight of paper, reduce the production cost and improve the performance of paper.
In addition, it can also be used in many industries such as fire fighting agent, feed, cosmetics, matting agent, pigment, paint and so on.
