These 14 applications of white carbon black (1) Silica is also known as hydrated silica. The chemical formula is SiO 2 ·nH 2 O. It is a white, non-toxic, amorphous and fine powdered inorganic silicon compound with porosity, high dispersibility, light weight and chemical stability. It has excellent properties such as good performance, high temperature resistance, non-combustibility, and good electrical insulation. It has been widely used in many fields such as plastics, rubber, papermaking, coatings, dyes and inks.


On the other hand, the active silanol on the surface of the white carbon black makes the white carbon black hydrophilic, and it is difficult to infiltrate and disperse in the organic phase, making it unusable in some special fields. However, the modified white carbon black improves the surface activity, which greatly broadens the application field of the product.

Let's take a look at which industries are favored by silica.

01
Application in tires

Silica is used as a reinforcing agent, and the largest amount is in the rubber field, which accounts for 70% of the total. White carbon black can greatly improve the physical properties of the rubber, reduce the lag of the rubber, and reduce the rolling resistance of the tire without losing its wet skid resistance. In the rubber industry, carbon black is a very effective reinforcing agent. Its biggest disadvantage is that it cannot be used to prepare colored products. Ultrafine white carbon black is used as a reinforcing filler for the production of green tires. It can replace carbon black for sidewalls. It can significantly increase the tear strength and crack growth resistance of the sidewalls without significant impact on the curing time. It is resistant to ozone. Aging depends on the amount of antioxidants and silica. Adding white carbon black to the tire tread rubber can improve the cut and tear resistance of the tread, and reduce the jump and block. Compared with ordinary carbon black filled rubber compound, the rolling resistance can be reduced by 30%.


02
Application in defoamer

Vapor-phase silica generally has two types of products, hydrophilic and hydrophobic. Among them, the hydrophobic product is obtained by surface chemical treatment of hydrophilic products. Nowadays, hydrophobic vapor-phase silica is commonly used by defoamer manufacturers. The hydrophobic group on the surface attracts the hydrophobic end of the surfactant in the foaming system, so that the hydrophobic solid particles become hydrophilic, thereby reducing the concentration of the surfactant in the foam, promoting the collapse of the foam, and improving the defoaming speed.


03
Application in paint and coating industry

Silica can be used as a rheological additive, anti-settling agent, auxiliary dispersant, and matting agent in the production of coatings. It has the functions of thickening, anti-settling, thixotropy, and matting. It can also improve the weather resistance and scratch resistance of the coating, increase the adhesion strength between the coating and the substrate and the hardness of the coating, improve the anti-aging property of the coating, and improve the UV absorption and infrared light reflection characteristics.


04
Application in electronic packaging

By fully dispersing the fumed silica after surface activation treatment in the silicone modified epoxy resin encapsulant matrix, the curing time of the packaging material (2.0-2.5h) can be greatly shortened, and the curing temperature can be reduced to room temperature , So that the sealing performance of the OLED device is significantly improved, and the service life of the OLED device is increased.

The application of fumed silica has reduced the process of electronic device packaging that required special environments in the past to room temperature conditions, greatly reducing production costs, and shortening the curing time of packaging materials, greatly improving production efficiency and reducing production costs. It has a promoting effect on the popularization and application of the new generation of OLED display technology.


05
Application in plastics

White carbon black is also often used in new plastics. Adding a small amount of white carbon black during plastic mixing will have a significant reinforcing effect, improve the hardness and mechanical properties of the material, thereby improving the processing technology and the performance of the product. In addition, white carbon black has the characteristics of small particle size and high light transmittance, which can make the plastic more dense and increase the transparency of the plastic.


06
Application in ceramics

Using fumed white carbon black instead of nano Al 2 O 3 to add to 95 porcelain, it can not only play the role of nano particles, but also the second phase particles, which not only improves the strength and toughness of the ceramic material, but also improves the material's strength and toughness. The properties of hardness and elastic modulus are more ideal than adding Al 2 O 3. The use of fumed silica to composite the ceramic substrate not only improves the density, toughness and smoothness of the substrate, but also greatly reduces the sintering temperature. In addition, the application effect of fumed silica in ceramic products such as ceramic filters and corundum balls is also very significant.

According to the editors of China Powder Network, it can also be used as a carrier to load Ti, Ag or Cu ions into ceramic materials, which can have an antibacterial effect, thereby preparing antibacterial ceramic sanitary ware.


07
Application in the paper industry

In the paper industry, fumed silica products can be used as a paper sizing agent, can improve the whiteness and opacity of paper, and can improve oil resistance, abrasion resistance, feel, printability, and gloss. It can also be used for printing drawings, which can make the surface of the paper good, the ink is stable, and the back is free of cracks. It can also be used in azide paper to produce excellent blue drawings, which can be used in copper paper to replace titanium dioxide. Adding 1-2% fumed silica product can reduce the weight of the paper, and the paper is thin, can improve the strength, prevent ink penetration, can also make the printed text clear and increase the opacity.