What is the principle of the antioxidant for PVC

The principle of the antioxidant for PVC film additives is that the thermal oxidation process of organic compounds is a series of free radical chain reactions. Under the action of heat, light or oxygen, the chemical bonds of organic molecules are broken, generating active free radicals and hydrogen. peroxide. Hydroperoxide undergoes a decomposition reaction, and also generates hydrocarbon oxygen radicals and hydroxyl radicals. These free radicals can initiate a series of free radical chain reactions, leading to fundamental changes in the structure and properties of organic compounds. The role of antioxidants is to eliminate free radicals that have just been generated, or to promote the decomposition of hydroperoxides and prevent the chain reaction from proceeding. Antioxidants that can eliminate free radicals include compounds such as aromatic amines and hindered phenols and their derivatives, called primary antioxidants; antioxidants that can decompose hydroperoxides include organic compounds containing phosphorus and sulfur, called Auxiliary antioxidants.