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. Silica can greatly improve the physical properties of the compound, reduce the lag of the compound, 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, and its biggest disadvantage is that it cannot be used to prepare colored products. Ultrafine white carbon black is used as a reinforcing filler to produce green tires. It can be used in the sidewall instead of carbon black. It can significantly increase the tear strength and crack growth resistance of the sidewall, but has no obvious effect on the vulcanization time. It is resistant to ozone. Aging is dependent on antioxidant and silica levels. Adding silica to the tread compound of tires can improve the cutting resistance and tear resistance of the tread, and reduce the jumping and falling blocks. Compared with ordinary carbon black filled compounds, the rolling resistance of silica filled compounds can be reduced by 30%.

02 Application in defoamer
Fumed silica generally has two types of products: hydrophilic and hydrophobic. Among them, the hydrophobic product is obtained by surface chemical treatment of the hydrophilic product. Now various defoamer manufacturers generally use hydrophobic fumed silica. The hydrophobic group on its surface is used to attract 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 bursting of the foam, and improving the defoaming. speed.

03 Application in paint and coating industry
Silica can be used as a rheology aid, anti-settling agent, dispersant, and matting agent in coating production, and has the functions of thickening, anti-settling, thixotropy, and matting. It can also improve the weather resistance and scratch resistance of the coating, improve the adhesion strength between the coating and the substrate and the hardness of the coating, improve the aging resistance of the coating, and improve the characteristics of ultraviolet absorption and infrared light reflection.