Superfine silica powderThe preparation generally includes chemical synthesis and natural mineral purification, but through long-term research, it has been found that chemical synthesis has high cost and low yield, which cannot meet the demand. Using natural quartz minerals as raw materials to prepare ultrafine powders can not only meet market demand, but also better reduce the content of harmful impurities in the powder.

The raw materials used for the production of ultrafine silicon powder are vein quartz, quartzite, fused quartz and composite raw materials. The choice of raw materials is very important, because the quality of raw materials used in production will directly affect the length of the production process, the level of production costs, and the quality of the final product. Example: When producing crystalline silicon powder, vein quartz with relatively pure texture (SiO2 content is generally ≥99.9%) is generally selected, while some surface pollution, quartzite and quartz conglomerate, which are easy to remove by ordinary chemical methods, are ignored. Of minerals. Quartzite and quartz conglomerate in some areas of our country are also very pure in texture. They are good raw materials for processing and producing high-purity and ultra-fine silicon powder, and their hardness is slightly softer than vein quartz and easy to process.

Ultrafine silicon powder used in plastics can effectively increase the bending and compressive strength of plastics, and can also improve the load-bearing capacity of most plastic products; it can replace carbon black in rubber products to improve the elongation and tearing of rubber. Crack strength and anti-aging performance; as an additive to coatings, it can significantly improve the wear resistance of coatings and enhance its coloring ability. However, its market prospects are to be used in the fields of plastic packaging materials for large-scale and ultra-large-scale integrated circuits, electronic components plastic packaging materials, and epoxy castable potting materials.

In the epoxy molding compound, high-purity silicon powder is the main raw material. Because SiO2 has stable physical and chemical properties, good light transmittance, linear expansion and excellent high temperature performance, SiO2 is the ideal epoxy plastic package at present The filling rate can reach 70%~90%. At the same time, high-purity ultra-fine silicon powder is also a substrate material for semiconductor integrated circuits. The world's demand for high-purity ultra-pure silicon powder will develop rapidly with the development of the IC industry. It is estimated that the world's demand for it will increase at a rate of 20% in the next 10 years.

The above is a brief description of the main raw material selection of ultra-fine silica powder. You can simply understand it. The content is for reference only, you can contact us if you need to consult.