Antimony trioxide flame retardant formula!

Release time:

2024-03-12 08:42

Most polymer materials are flammable, which will produce a lot of smoke and harmful gases in the combustion process, which seriously endanger the safety of human life, so it is very meaningful to carry out flame retardant treatment. Antimony trioxide is a highly efficient additive flame retardant, which can be used independently or with other flame retardants and smoke suppressants.


Antimony trioxide Sb2O3, also known as antimony white, is widely used as an auxiliary flame retardant for various synthetic materials because of its excellent synergistic flame retardant effect when combined with halogen flame retardants. Polyvinyl chloride itself is a halogen-containing polymer, which makes the application of antimony trioxide in flame retardant PVC plastics special and more common.

Antimony trioxide is mainly used as a flame retardant component of synthetic materials. In addition, it can also be used as a high-grade glass clarifying agent for picture tubes, fluorescent tubes, coatings, pigment additives (to improve water resistance, color persistence and flame retardant), heat-resistant colorants and glaze agents for enamel, ceramics, glass, alkaline dye mordant, petrochemical and synthetic fiber industry catalysts and raw materials for the manufacture of antimony salts.

Antimony trioxide is one of the general flame retardant synergistic agents. It is used as an additive flame retardant. When used alone, the flame retardant effect is very small (unless the flame retardant polymer already contains halogen). When used in combination with halogen flame retardant, the efficiency of halogen flame retardant can be greatly improved. It is a general flame retardant for polyethylene, polypropylene, polyvinyl chloride, polyester, polystyrene, epoxy resin, polyurethane and other plastics.

The flame retardant mechanism of antimony trioxide belongs to the gas phase flame retardant mechanism. In the early stage of combustion, the first is the melting process. A protective film is formed on the surface of the material to isolate the air, and the combustion temperature is reduced through internal endothermic reaction. Antimony is vaporized, diluting the oxygen concentration in the air, thus playing a flame retardant role. The melting point of antimony trioxide is 656 ℃, the boiling point is 1 425 ℃, the flame retardant effect is not significant when used alone. Usually, the excellent synergistic effect of antimony trioxide is used with other flame retardants and used to achieve flame retardant purposes.

Antimony trioxide

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