Amine antioxidants, amine antioxidants are mainly used to inhibit thermal oxygen aging, ozone aging, fatigue aging and heavy metal ion catalytic oxidation, the protection effect is exceptional. Its disadvantage is the pollution, according to the structure can be further divided into:

Phenyl naphthylamine class: such as anti-A or anti-A, antioxidant J or D, PBNA is the oldest antioxidant, mainly used to inhibit thermal oxygen aging and fatigue aging, due to toxicity reasons, this type of antioxidant has been rarely used in foreign countries.

Ketamine antioxidant: can give diene rubber very good heat and oxygen aging performance, in some cases to give good resistance to flexural cracking performance, but rarely inhibit the catalytic oxidation of metal ions and ozone aging function. Anti-aging agent RD. Anti-aging agent AW not only has the function of antioxidant, and often used as anti-odor oxygen agent.

Diphenylamine derivatives: These antioxidants inhibit the effectiveness of thermal oxygen aging equal to or less than the dihydroquinoline polymer, when used as an antioxidant, they are equivalent to antioxidant DD. but the protection against fatigue aging is lower than the latter.

Derivatives of p-phenylenediamine: These antioxidants are a class of antioxidants widely used in the rubber industry at present. They can inhibit ozone aging, fatigue aging, thermal oxygen aging and metal ion-catalyzed oxidation of rubber products. Dialkyl p-phenylenediamine (such as UOP788). These substances have a special anti-static ozone aging, especially static ozone aging performance without paraffin, and good inhibition of thermal oxygen aging effect. However, they have a tendency to promote scorching.

The use of these substances with alkyl aryl p-phenylenediamine can provide good protection against static dynamic ozone aging. In fact, dialkyl-p-phenylenediamine is always used in combination with alkyl-aryl-p-phenylenediamine. Alkyl aryl p-phenylenediamine such as UOP588, 6PPD. such substances have outstanding protection against dynamic ozone aging. when used with paraffin wax, they also show outstanding protection against static ozone aging and usually do not have the problem of spraying frost. The earliest variety, 4010NA, is still widely used.

6DDP is also a commonly used antioxidant in this category. The reasons for this are that it does not cause dermatitis, it has less effect on process safety compared to other alkyl aryl p-phenylenediamine and dialkyl p-phenylenediamine, it has less tendency to promote scorching, it is less volatile compared to other alkyl aryl and dialkyl p-phenylenediamine, it is an excellent stabilizer for SBR, and it shows the properties of an antioxidant. When the substituents are all aryl, it is called p-phenylenediamine. Compared with alkyl aryl p-phenylenediamine, the price is low, but the anti-ozonation activity is also low, and because of its slow migration rate, these substances have good durability and are effective antioxidants. Their disadvantage is that they are easy to spray cream in rubber with low solubility, but it is very useful in CR it can produce very good protection. And it does not produce the problem of promoting scorching.

Phenolic antioxidants

This type of antioxidant is mainly used as an antioxidant, individual varieties also have the role of passivation of metal ions. But the protective effect is not as good as the amine antioxidant, the main advantage of this type of antioxidant is non-polluting, suitable for light-colored rubber products.

Hindered phenol: this type of antioxidant is widely used antioxidant 264, SP and other high molecular weight antioxidants, compared to the volatility of such substances and therefore poor durability, but these substances have a medium protective effect. Anti-aging agent 264 can be used in food-grade products.

Hindered bisphenols: commonly used varieties of 2246 and 2246S, the protection function and non-pollution of these substances is better than hindered phenols, but the price is high, these substances can provide effective protection for rubber sponge products, but also used in latex products.

Multi-phenols, mainly refers to the derivatives of p-phenylenediamine, such as 2,5-di-tert-amylhydroquinone is one of them, these substances are mainly used to maintain the viscosity of unvulcanized rubber films and adhesives, but also NBR BR stabilizer.

Organic sulfide type antioxidant

This type of antioxidant is widely used as a stabilizer for polyolefin plastics as a hydroperoxide destroying antioxidant. More applications in rubber are dithiocarbamates and thiol-based benzimidazoles. The current application of a more is dibutyl dithiocarbamate zinc. This substance is commonly used in the production of butyl rubber stabilizer. Another is dibutyldithiocarbamic acid nickel (antioxidant NBC), can improve the protection of NBR, CR, SBR static ozone aging. But for NR helps kang oxidation effect.

Thiol-based benzimidazole

Such as antioxidants MB, MBZ, is also one of the commonly used antioxidants in rubber, they have a moderate protective effect on NR, SBR, BR, NBR. And have inhibited the catalytic oxidation of copper ions, such substances and some commonly used antioxidants and often produce synergistic effects. This type of antioxidant pollution is often used in light-colored products.

Non-migratory antioxidant

Where the rubber in a lasting protective effect of antioxidants, called non-migrating antioxidants, some are also called non-extractable antioxidants or persistent antioxidants. Compared with the general antioxidant is mainly difficult to extract, difficult to play and difficult to migrate, so that the antioxidant in the rubber to play a lasting protective effect of the following four methods:

1、Increase the molecular weight of the antioxidant.
2, the processing of antioxidants and rubber chemical bonding.
3、The antioxidant is grafted on the rubber before processing.
4, in the manufacturing process, so that the monomer with protective function and rubber monomer copolymerization.
The antioxidant in the latter three methods, sometimes also known as reactive antioxidant or polymer bonding antioxidant.