The product coated on the surface of silica powder particles by a specific process not only retains the original characteristics of ordinary silica powder, but also greatly improves the interfacial crosslinking effect between epoxy resin and silica powder, reduces the viscosity, increases the fluidity, and improves the mechanical strength of the product.
The silica powder is coated with the activator on the surface of the transformer, which makes it more miscible with epoxy resin and greatly reduces the stratification and precipitation of the product.Without changing the quality and standard of the product, the amount of filler can be increased and the amount of epoxy resin can be reduced, so as to reduce the production cost and improve the economic benefit.
According to the needs of special customers for the activation degree and hydrophobic performance of silica powder, we specially add long-acting active silica powder products, which increases the hydrophobic performance of products without changing the original performance, especially without increasing the viscosity, thus eliminating the phenomenon of product layering in the curing system.It can be combined with epoxy resin and curing agent, but it will not promote and retarding curing reaction speed of epoxy resin and curing agent system, nor will it affect casting performance.
Electrician grade silica powder used in transformer: choose high grade natural quartz, high purity crystalline silica powder processed by pickling, high pure water treatment and other processes.Its color is white, texture is pure, no noise particles.
1. It is a special filler for epoxy pouring for high-voltage power transmission and transformation system, and the most ideal insulation material for pouring in the electrical industry;
2, used in the production of silicae rubber wear resistance, heat resistance, large filling capacity;
3, fine powder can be used in paint, paint production as wear-resisting high temperature filler.
Performance of silica powder for casting of transformer
Good insulation: due to high purity of silica powder, low impurity content, stable performance and excellent electrical insulation performance, the cured products have good insulation performance and anti-arc performance.
Reduce the exothermic peak temperature of epoxy resin curing reaction, reduce the linear expansion coefficient and shrinkage rate of cured products, so as to eliminate the internal stress of cured products and prevent cracking.
Corrosion resistance: silica powder is not easy to react with other substances, and can not react with most acids and alkalis. Its particles cover the surface of objects evenly, so it has strong corrosion resistance.
Reasonable grain gradation can reduce and eliminate precipitation and stratification.It can enhance the tensile and compressive strength of the solidified products, improve the abrasion resistance, and increase the thermal conductivity of the compounds, and increase the flame retardant performance.
As filler, silica powder is added into organic resin, which not only improves the properties of cured products, but also reduces the product cost.