Performance and application of silicon micropowder

Silicon micro powder, also known as quartz powder, is made of natural quartz (SiO2) or molten quartz (natural quartz after high temperature melting, cooling amorphous SiO2) by crushing, ball grinding (or vibration, airflow grinding), flotation, pickling purification, high purity water treatment and other multi-channel processing of micro powder  

Properties of silica powder

In addition to the excellent properties such as low thermal expansion coefficient, excellent dielectric properties, high thermal conductivity and good suspension performance, silicon powder also has the following properties:  

(1) Good insulation: due to the high purity of silicon powder, low impurity content, stable performance, excellent electrical insulation performance, so that the cured material has good insulation performance and arc resistance.  

(2) it can reduce the exothermic peak temperature of epoxy resin curing reaction, reduce the linear expansion coefficient and shrinkage rate of the cured material, so as to eliminate the internal stress of the cured material and prevent cracking.  

(3) Corrosion resistance: silicon powder is not easy to react with other substances, and can not react with most acid and alkali. Its particles uniformly cover the surface of the object, and it has strong corrosion resistance.  

(4) Reasonable particle size distribution, use can reduce and eliminate precipitation, stratification phenomenon;  It can enhance the tensile strength and compressive strength of the cured material, improve the wear resistance, and increase the thermal conductivity of the cured material, increase the flame retardant performance.  

(5) The silicon powder treated by silane coupling agent has good infiltration, good adsorption performance, easy to mix, and no agglomeration phenomenon for all kinds of resins.  

(6) Silicon powder as filler, added to the organic resin, not only improve the performance of the cured material, but also reduce the cost of the product.  

Classification of silica powder

First, according to the different production process and production of silicon powder its quality is not the same, according to the different production process can be divided into: molten silicon powder, crystalline silicon powder, active silicon powder, quartz silica powder a total of four kinds.  

Two, from the morphology can be divided into: angular silicon powder and spherical silicon powder.  

Three, high-tech silicon powder can be divided into: ultrafine silicon powder, spherical silicon powder, high purity silicon powder.  

Four, the silicon powder applied to the integrated circuit copper clad plate can be divided into five varieties: crystalline silicon powder, molten (amorphous) silicon powder, spherical silicon powder, composite silicon powder, active silicon powder.  

Application of silica powder

Coating material  

In the coating industry, the properties of silicon powder such as particle size, whiteness, hardness, suspension, dispersity, low oil absorption and high resistivity can improve the corrosion resistance, wear resistance, insulation and high temperature resistance of coatings.  Silicon powder used in coating has been playing an important role in coating filler because of its good stability.  Especially for external wall coating, SiO2 raw materials play a decisive role in weather resistance.  

Plastic material  

Silicon powder in plastic can be used in polyvinyl chloride (PVC) floor, polyethylene and polypropylene film, electrical insulation materials and other products.  

The PVC floor tile that fills silicon micropowder can enhance the wear resistance of the product, in PVC floor, fineness 320 purpose quartz powder, filling amount is 160 ~ 180 when the floor is made completely accords with the requirement of GB4085-83 standard, floor surface smoothness is good, good resistance to scratch.  

In PVC acid resistant plate tube, the filling amount of 400 mesh quartz powder is 10% ~ 15%, compared with other filling materials, low viscosity, good fluidity, improve the processing performance, is conducive to the extrusion and molding of products, the acid resistance of acid resistant plate tube has been significantly improved.  

Polyethylene (PE) agricultural film filled with silicon powder with large specific surface area (more than 600 mesh) and high activity can improve the physical, chemical and optical properties of the product, while polypropylene can improve the mechanical properties of the product.

Electrician, electronics  

Electrical grade silicon powder is mainly used for insulation casting of ordinary electrical parts, insulation casting of high voltage electrical appliances, APG process injection material, epoxy potting material, high-grade ceramic glaze and so on.  

Electronic grade silicon powder is mainly used in integrated circuits, electronic components of the plastic and packaging materials.