Antimony trioxide-PVC flame retardant properties

Polyvinyl chloride has a flame-retardant effect because it contains chlorine atoms. However, when a large amount of plasticizer is added to the polyvinyl chloride to make it soft polyvinyl chloride, its flame-retardant treatment is very effective. necessary. What needs to be emphasized here is that in addition to flame retardant, smoke suppression is also an urgent problem to be solved by PVC. (L) Choose flame-retardant plasticizers-phosphate plasticizers (aryl phosphate, aryl alkyl phosphate), chlorinated paraffin and chlorinated fatty acid plasticizers, when selecting flame-retardant plasticizers Consideration should be given to using plasticizers that can both play a plasticizing effect and do not reduce the flame retardancy too much. (2) Synergistic flame retardant. Due to the synergistic effect between halogen and antimony, adding antimony trioxide to PVC can produce better flame retardant effect on PvC. If chlorinated paraffin is used at the same time, the effect is better. In soft PVC, zinc borate can be used to replace part of antimony trioxide to act as a synergist, improve flame retardancy and reduce smoke generation. (3) Inorganic fillers. Inorganic fillers, especially magnesium hydroxide and aluminum hydroxide, have a good flame retardant effect on soft PVC, and the greater the amount added, the better the effect.