An antioxidant is an unsaturated double bond in a plastic that is attacked by oxygen atoms, heat and light to cause free radicals to break, thereby causing a chain reaction, causing the molecular chain to break or form a chain crosslink, resulting in a finished plastic product. The strength is reduced or becomes brittle. The function of antioxidants is to delay the decomposition of plastics due to oxidation and prolong the life of plastic products.
The antioxidants used in the plastics industry can be distinguished by function:
1) Oxidative chain reaction inhibitors: alkyl phenol, Butylated hydroxytoluene (BHT), aromatic amines, Phenyl-B-Naphthylamine And alkyl quinone, alkylene bisphenol, alkyl phenolthioether, Phenyl salicylate, and the like.
2) Peroxide decomposition agent: a thiol ether system, a Thio propionate ester, an organic phosphites, a disulfide sulfonate, and the like.
3) Heavy metal inactivating agents: such as amidates, urethanes, aromatic amine compounds, and the like.
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