Flame retardant, heat stable or heat-resistant materials are products based on the refined processing of natural minerals. Compared with synthetic flame retardant, heat stable or heat-resistant materials, they have comprehensive advantages and characteristics such as green environmental protection, low manufacturing cost, moderate or unique performance. They are new functional materials with good development prospects, broad market application prospects and large market consumption capacity.

At present, the flame-retardant and smoke eliminating mechanism of mineral flame-retardant powder materials with high performance and large amount mainly includes four aspects:

(2) a large amount of water vapor or carbon dioxide gas produced by the decomposition of mineral materials can reduce the oxygen concentration in the combustion environment and prevent the rapid combustion;

(4) the oxides produced by decomposition require high chemical activity, which can not only absorb the free radicals, carbon and toxic gases produced by combustion, but also promote the fast formation of carbonized layer in the combustion process of the combusted products, so as to produce better flame retardant and smoke eliminating effects.

Wollastonite is a white calcium silicate mineral with chain structure, and its theoretical formula is CaSiO3. There are a lot of active groups such as Si-O-Si, Ca-O, Si-O, Si-OH on the surface of crushed wollastonite, which have strong binding ability with organic matrix. Wollastonite is generally used in combination with magnesium flame-retardant minerals or organic flame-retardant materials. The addition of fibrous wollastonite powder to the flame-retardant high impact polystyrene (HIPS) matrix can improve the elongation at break, bending modulus of elasticity, heat resistance and processing performance of the flame-retardant hips materials. Wollastonite is dispersed into the hips matrix with needle like fine strips with a certain length diameter ratio, which changes the glass fiber The role of sexual enhancement. Wollastonite is widely used in PP, EVA, polyamide, polystyrene and other polymer systems. Wollastonite accounts for 10% ~ 15% of the market of mineral filler, especially for the application environment exposed to ultraviolet and water immersion, the filled material can show excellent performance.