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What are the commonly used tire additives?

What are the commonly used tire additives?

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Hindered phenolic antioxidants are some of the hindered phenolic compounds, their thermal oxidation effect is significant, will not contaminate the product, the development of fast. There are many varieties of antioxidants, important products are: 2,6-tertiary butyl-4-methyl phenol (b), bis (3,5-tertiary butyl-4-hydroxyphenyl) sulfur Ether (c) and tetrakis [β-(3,5-tertiary butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester (d). Tetrakis [β-(3,5-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester is an excellent antioxidant for polyolefins. Hindered phenolic antioxidants are mainly used in plastics, synthetic fibers, latex, petroleum products, food, medicine and cosmetics.
Aromatic amines Antioxidants, also known as rubber antioxidants, are the most widely produced categories, mainly used in rubber products. These antioxidants are inexpensive and have high antioxidant effects. However, due to the discoloration of the products, They are used in light and white products. Important aromatic amine antioxidants are: diphenylamine, p-phenylenediamine and dihydroquinoline and other compounds and their derivatives or polymers. Representative products are N-isopropyl-N'-phenyl-p-phenylenediamine (see structural formula a). The product is gray to purple crystal, the melting point of 70 ℃ or more, can be used in natural rubber, styrene-butadiene rubber, neoprene and isoprene rubber and other products.
The thermal oxidation process of organic compounds is a series of free radical chain reactions. Under the action of heat, light or oxygen, the organic molecules first break on the weakest chemical bonds to produce lively free radicals R and hydroperoxides. The hydroperoxide ROOH undergoes a decomposition reaction and also produces a hydrocarbon oxygen radical RO and a hydroxyl radical HO. These free radicals can lead to a series of free radical chain reaction, and finally lead to organic compounds and the nature of the fundamental changes in the structure. The role of antioxidants is to eliminate the free radicals, or to promote the decomposition of hydroperoxide, to prevent the chain reaction. Can eliminate free radical antioxidants are aromatic amines and hindered phenols and other compounds and their derivatives, known as the main antioxidant; can break down the antioxidant antioxidant phosphorus and phosphorus containing organic compounds, known as Auxiliary antioxidant.

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