Antioxidants are a class of chemicals that, when present in only small amounts in polymer systems, can delay Or inhibit the oxidation process of the polymer, thereby preventing the aging of the polymer and extending its service life, also known as “anti-aging agent”.
Why add antioxidants to plastics and elastomers:
The effective solution to the yellowing of elastomers is to add antioxidants and ultraviolet absorption agent, which can effectively prevent and delay yellowing. For engineering plastics processing, antioxidants can prevent thermal oxidation degradation during the processing of certain polymers (such as ABS, etc.), allowing the molding process to proceed smoothly. The amount of antioxidants added is generally only 0.1-0.5 parts.
Classification of antioxidants added to plastics and elastomers:
Classification of antioxidants, one is the main antioxidant: capturing oxidation Free radicals, mainly hindered phenol antioxidants; the main resistance is spatially hindered phenols, antioxidant 1010 and antioxidant 1076 belong to this category, which exert long-term and sustained antioxidant effects by capturing free radicals generated during the degradation of plastics. .
One is an auxiliary antioxidant: it decomposes hydroperoxides, mainly phosphites and thioesters. Auxiliary antioxidants – phosphites and thioesters. Antioxidant 168 is a phosphite auxiliary antioxidant. It achieves antioxidant purposes by decomposing peroxides produced by further degradation of plastics. It mainly provides thermal processing stability; main Using resistance + auxiliary resistance together can produce a synergistic effect.
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