Introduction
Chemical name: Acrylonitrile Butadiene Styrene, English name: Acrylonitrile Butadiene Styrene, Specific gravity: 1.05 g/cm³, Molding shrinkage: 0.4-0.7%, Molding temperature: 200-240℃, Drying conditions: 80-90℃ for 2 hours.
Combustion mechanism
The combustion mechanism of ABS resin is extremely complex, due to the variety of raw materials, proportions, process conditions, and production methods used.ABSThe actual composition of resins varies greatly, and so do their combustion properties. Generally, as the butadiene content increases, the transparency of the resin decreases and its flammability increases. This is because substituted tertiary carbon atoms in the polybutadiene phase facilitate oxygen's abstraction of hydrogen from butadiene, initiating oxidation and accelerating the degradation of ABS. Some also believe that the thermal-oxidative aging of ABS can be explained by the thermal degradation of acrylonitrile-butadiene and butadiene-styrene copolymers. In the pyrolysis products of acrylonitrile-butadiene copolymers, no specific product HCN, characteristic of acrylonitrile, was found; this is due to the unsaturated components generated from the thermal decomposition of the butadiene part, which quickly react with HCN. Essentially, like other polymers, ABS generates highly reactive free radicals HO· during combustion, and the concentration of HO· is key to determining the combustion rate. When polymers encounter HO·, they form polymer radicals and water, and in the presence of oxygen, produce more HO· radicals, allowing the reaction to continue until CO2 and H2O are ultimately formed.
