An introduction to hindered phenolic antioxidants

An introduction to hindered phenolic antioxidants
I. Introduction.

Hindered phenol antioxidants are phenolic compounds with a spatially hindered structure. They are the main type of chain-terminating antioxidants, which, to put it bluntly, trap free radicals, thereby delaying the degradation process of polymeric materials. According to the number of hindered phenol functional groups in the molecule is generally divided into mono- and multi-hindered phenols.

Second, the mechanism of action.

Hindered phenol antioxidants are mostly used in rubber and plastic products, polyurethane products and other polymer field, and phosphite, thioether and other auxiliary antioxidants to show the effect of coordination between.

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Third, the market situation.

There are representative varieties of 2,8 a di-tert-butyl-4 a methyl phenol, that is, BHT, antioxidant 1010, antioxidant l1076, etc.. These products are particularly common in polymer products.

Since the 1990s, foreign patents have gradually been made public, and domestic manufacturers have started to make antioxidants, the effect of which is in fact much the same as that of carbolic acid. But the price is 25-30% cheaper than carbide. So gradually by the domestic manufacturers favoured. Among them, Beijing Jieyi, Shandong Sanfeng, Yingkou scenery, is the main manufacturers of domestic alkyl phenol series.

However, the production process of each manufacturer is not the same, and slowly some antioxidants for various polymer fields have been developed one after another. Such as polyurethane special antioxidant 1135, cross-linked polyethylene special antioxidant 300, polyamide special antioxidant 1098, PPR pipe special antioxidant 330 and so on.

Fourth, summary.

For their own research and development system selection of antioxidants, to improve the weather resistance of their own products, is particularly important.