Antioxidant is a chemical substance. When it only exists in polymer system, it can delay or inhibit the oxidation process of polymer, so as to prevent polymer aging and prolong its service life. It is also called anti-aging agent.

Why Add Antioxidants to Plastics and Elastomers?

The effective solution to elastomer yellowing is to add antioxidant and ultraviolet absorber, which can effectively prevent and delay yellowing. For the processing of engineering plastics, antioxidants can prevent the thermal oxidative degradation of some polymers (such as ABS) in the processing process, so that the molding process can be carried out smoothly. The amount of antioxidant 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 phenol inhibiting antioxidants; It is mainly anti space blocking phenol and antioxidant 1010. Antioxidant 1076 belongs to this category. It plays an antioxidant role for a long time by capturing free radicals produced in the process of plastic degradation.

One is auxiliary antioxidant: decompose hydroperoxide, mainly phosphite and thioester. Auxiliary resistance - phosphite and thioester. Antioxidant 168 belongs to phosphite auxiliary resistance. It achieves the purpose of oxidation resistance by decomposing the peroxide produced by further degradation of plastic, mainly providing heat processing stability; Main resistance + auxiliary resistance can produce synergy.