What is silica? What are the uses of silica?
The chemical formula of silica is SiO2, there are two kinds of silica, crystalline silica and amorphous silica in nature. The use of silica is very extensive, this article describes its main applications. 1, thickener and thixotropic agent Relying on the surface of the hydroxyl ,silica is easy to form hydrogen bonds .When brushing and spraying it has better fluidity,so we usually use silica in the original paint in the paint to prevent sagging. 2, flatting agentSilica has good absorbance and high concentrations may lead to increased viscosity. The matting agent is capable of adjusting the extinction at 45 °, 60 ° and 85 ° orientation. Coatings with silica matting agents can be overcoated. 3, film anti-blocking agent / opening agent In polyethylene, polyphenylene, non-toxic polyvinyl chloride film production by adding silica, can make the film very easy to open. Because of the formation of tiny irregularities on the surface of the film, there is a slight geometric space between the films to prevent penetration of low-molecular substances. 4, the application of rubber Silica can greatly improve the physical and mechanical properties of rubber compounds to reduce rubber lag and reduce tire rolling resistance without losing wet skid resistance. It is widely used in all kinds of rubber products. 5, in plastic applications Due to the high strength, high mobility and small particle of silica,it can improve compactness, surface finish and wear resistance. 6, in the application of atomic ashSilica is the best anti-settling agent. In the production of ashes, the addition of silica improves the settling stability of the system, has good anti-settling effect and excellent thixotropy. In summary, silica is widely used in many industries, for example, can be used as the pharmaceutical industry tabletting additives, active ingredient carrier, semiconductor wafer polishing agent, powder material anti-caking agent.