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ABS resin combustion mechanism

  • source:admin
  • Release date:2018-09-17
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ABS resin composition varies widely, its combustion performance also has its own difference. Generally, with the increase of butadiene component, the transparency of the resin is reduced and the flammability is increased. This is because the substituted tertiary carbon atoms exist in the polybutadiene phase, which is favorable for oxygen to take hydrogen from butadiene and initiate oxidation, accelerate ABS resin degradation. Some people think that thermal aging of ABS resin can be explained by the thermal degradation of acrylonitrile-butadiene and butadiene-styrene copolymer. There is no unique characteristic of acrylonitrile in the pyrolysis products of acrylonitrile-butadiene copolymer The product HCN, which is because the butadiene part of the pyrolysis produces unsaturated components, HCNN reaction quickly.
ABS resin is essentially the same as other polymers, the combustion process produces a special splash of HO · free radicals, and HO · concentration is the key to determine the burning rate. When polymer and HO · meet to generate polymer free radicals and water, in the presence of oxygen, HO · radicals are produced again, and the reaction proceeds. Finally, CO2 and H2O are generated [4]. In order to prevent the plastic from burning, the basic method is to suppress the occurrence of flammable gases and isolate the oxygen in the air. In general, the combustion process includes heating, melting, depolymerization, decomposition, oxidation and ignition and other steps. In the various steps of the combustion process, its speed will be subject to many factors, in addition to outside factors, the difficulty of combustion of polymer materials mainly depends on their combustion characteristics.