1. Aromatic Amine Antioxidants
Aromatic amine antioxidants, also known as rubber antioxidants, are produced in large quantities. These antioxidants are cheap and have significant antioxidant effects. However, they cause discoloration of the products, which limits their use in light-colored and white products. It is mainly used in plastics, synthetic fibers, latex, petroleum products, food, medicine and cosmetics. Important aromatic amine antioxidants include: diphenylamine, p-phenylenediamine, dihydroquinoline and other compounds and their derivatives or polymers, which can be used in products such as rubber, styrene-butadiene rubber, chloroprene rubber and isoprene rubber. .
2.Hindered Phenolic Antioxidants
Hindered phenolic antioxidants are phenolic compounds with steric hindrance. They have strong thermal oxidation resistance and will not pollute products. They are developing rapidly. There are many varieties of this type of antioxidants. Important products include: 2,6-tertiary butyl-4-methylphenol, bis(3,5-tertiary butyl-4-hydroxyphenyl) sulfide, tetrakis [β-(3,5-tertiary butyl-4-hydroxyphenyl) propionate] quaternary tetrahydrol ester, etc. This type of antioxidant is mainly used in plastics, synthetic fibers, latex, petroleum products, food, medicine and cosmetics. (The picture on the right shows the structure of hindered phenolic antioxidants)
3. Auxiliary Antioxidant
Thiodipropionic acid diester is a type of auxiliary antioxidant. It is often used together with hindered phenolic antioxidants and has a significant effect. For example, thiodipropionic acid diester is often used together with hindered phenolic antioxidants and has a significant effect. , the main products are: didecyl alcohol ester, distetradecanol ester and disoctadecyl alcohol ester.
Phosphite is also an auxiliary antioxidant. The main products are: trioctyl ester, tridecyl ester, tris(dodecanol) ester and tris(hexadecanol) ester.
