As an important means of modifying polymer composite materials, crystalline silicon micropowder inorganic powder has received increasing attention. Filling the polymer with inorganic powder can not only reduce the cost of the material, but also improve the various properties of the polymer, such as strength, rigidity, heat distortion temperature, thermal conductivity, corrosion resistance, flame retardancy, and insulation. Among them, as an important inorganic filler, silicon micropowder has been widely used in rubber and plastics due to its superior stability, reinforcement, thickening, thixotropy, thermal conductivity, heat resistance, high insulation, and low expansion. , Adhesives and coatings.

Silicon micropowder is a powder material with a certain particle size distribution, and it mainly becomes SiO2. It is made of natural quartz (SiO2) or fused quartz through crushing, ball milling (or vibration, jet milling), flotation, pickling purification, high-purity water treatment and other processes. According to different preparation processes, it can be divided into crystalline silicon powder and fused silicon powder. The fused silicon powder has two forms, angular and spherical.

Among the various forms of silicon powder, crystalline silicon powder has no effect on the polymer system. Its dispersibility and sedimentation resistance are not as good as fused spherical silicon powder, and its thermal shock resistance and thermal expansion coefficient are not as good as fused angular silicon powder. The performance is even worse than the recently developed nano silicon powder. However, considering the cost and economic benefits, the price of crystalline silicon powder is lower than that of fused silicon powder, and the thermal conductivity is higher than that of fused silicon powder. Therefore, it is more inclined to use high-purity resultant silicon powder in practical applications.

Ultra-fineness is the development trend of non-metallic mineral processing and utilization. Ultrafine silicon powder has the advantages of large specific surface area, large surface activity, and good dispersibility. Compared with ordinary silicon powder, ultra-fine silicon powder has more surface defects and more non-coordinating atoms, and it is more likely to be physically or chemically combined with the polymer, which enhances the interface bonding between the particles and the polymer matrix. Therefore, it is widely used in coatings, Paint, engineering plastics, adhesives and silicone rubber.

The above is the application of crystalline silicon powder in polymer that the editor told you. You can simply understand it. The content is for your reference only, you can contact us if you need to know about it.