10 Major Application Fields of Silica Powder
Microsilica powder is a silica powder made from crystalline quartz, fused quartz, etc., and processed through grinding, precision classification, impurity removal and other processes. It is widely used in copper-clad laminates, epoxy plastic sealants, electrical insulation materials, rubber, Plastics, coatings, adhesives, artificial stone, honeycomb ceramics, cosmetics and other fields.
1. Copper clad laminate
At present, silica powder used in copper-clad laminates can be divided into crystalline silica powder, fused silica powder, spherical silica powder and composite silica powder. The filling weight ratio of resin in the copper clad laminate is about 50%, and the filling rate of silica powder in the resin is generally 30%, that is, the filling weight ratio of silica powder in the copper clad laminate is about 15%.
2. Epoxy plastic sealing compound
Microsilica powder is the most important filler in epoxy molding compound (EMC), accounting for about 60%-90%. The performance improvement of epoxy molding compound needs to be achieved by improving the performance of silica powder. Therefore, the particle size, purity and sphericity of silica powder are important. degree has higher requirements.
3. Electrical insulation materials
Microsilica powder is used as epoxy resin insulating filler for electrical insulation products. It can effectively reduce the linear expansion coefficient of the cured product and the shrinkage rate during the curing process, reduce internal stress, and improve the mechanical strength of the insulating material, thereby effectively improving and improving the insulating material. mechanical and electrical properties.
4. Rubber
Silica powder has the advantages of small particle size, large specific surface area, good heat resistance and wear resistance, and can improve the wear resistance, tensile strength and modulus, high tear and other properties of rubber composite materials. However, the surface of silica powder contains a large amount of If the acidic silanol groups are not modified, the silica powder will be unevenly dispersed in the rubber, and the acidic groups will easily react with alkaline accelerators, prolonging the vulcanization time of the rubber composite.
5. Plastic
Microsilica powder can be used as a filler in polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polyphenylene ether (PPO) and other materials in the process of making plastics. It is widely used in construction, automobiles, electronic communications , insulation materials, agriculture, daily necessities, national defense and military industry and many other fields.
6. Paint
Microsilica powder can be used as a filler in the coating industry. It can not only reduce the cost of preparing coatings, but also improve the high temperature resistance, acid and alkali resistance, wear resistance, weather resistance and other properties of coatings. It can be widely used in building materials, automobiles, pipes, hardware, etc. Household appliances and other fields.
7. Adhesive
As an inorganic functional filling material, silicone powder can effectively reduce the linear expansion coefficient of the cured product and the shrinkage during curing when filled in the adhesive resin, improve the mechanical strength of the adhesive, improve heat resistance, permeability and heat dissipation performance, thereby improving the adhesion knotting and sealing effect.
The particle size distribution of silica powder will affect the viscosity and settling properties of the adhesive, thereby affecting the processability of the adhesive and the linear expansion coefficient after curing.
8. Artificial quartz stone
When silica powder is used as a filler in artificial quartz slabs, it can not only reduce the consumption of unsaturated resin, but also improve the wear resistance, acid and alkali resistance, mechanical strength and other properties of artificial quartz slabs.
9. Automobile honeycomb ceramics
The automotive exhaust filter DPF (Diesel Particulate Filter) made of honeycomb ceramic carrier for automobile exhaust purification and cordierite material for diesel engine exhaust purification is made of alumina, silica powder and other materials through mixing, extrusion molding, drying, sintering, etc.
10. Cosmetics
Spherical silica powder has good fluidity and large specific surface area, making it used in cosmetics such as lipstick, powder cake, and foundation cream.
Different application fields of silica powder have different quality requirements. The application research of silica powder will mainly focus on high-tech fields such as high-end copper-clad laminates, high-end coatings, high-performance adhesives, and insulating materials produced using spherical silica powder as raw materials. Refinement and functionality Specialization will be the mainstream direction of silica powder application in the future.