1, amine anti-aging agent, amine anti-aging agent is mainly used to inhibit thermal oxygen aging, ozone aging, fatigue aging and heavy metal ion catalytic oxidation, the protective effect is particularly.Its disadvantage is pollution, which can be further divided into:
A, phenylnaphthylamine, such as anti-a or anti-a, anti-aging agent J or D,PBNA is the oldest anti-aging agent, mainly used to inhibit thermal oxygen aging and fatigue aging, because of the toxicity of the reason, this kind of anti-aging in foreign countries has been rarely used.
B, ketone amine kind of aging agent, can give diene kind of rubber very good heat resistance oxygen aging performance, in some cases give very good flexor cracking resistance performance, but very little inhibition of metal ions catalytic oxidation and ozone aging function.The most commonly used variety is BLE.Anti - aging RD. Anti - aging AW not only has the function of an antioxidant, but often used as an anti - odor oxygen agent.
C. Diphenylamine derivatives, which are equivalent to or less effective than dihydroquinoline polymers in inhibiting thermal aging, are equivalent to DD when used as antioxidants.But the protective effect on fatigue aging is lower than the latter.
D. Derivatives of p-phenylenediamine, this kind of anti-aging agent is currently widely used in the rubber industry.They can inhibit the ozone aging, fatigue aging, thermal oxygen aging and metal ion catalytic oxidation of rubber products.(e.g. UOP788).This kind of material has the special anti-static ozone aging, especially when there is no paraffin in the static ozone aging performance, and has a good inhibition of thermal oxygen aging.But there is a tendency to promote coke burning.
The combination of these substances with alkyl aryl p-phenylenediamine can effectively protect against ozone aging under static and dynamic conditions.In fact, dialkyl p - phenylenediamine is always used in conjunction with alkyl aryl p - phenylenediamine.Alkyl aryl p - phenylenediamine such as UOP588, 6PPD.This kind of material has outstanding protective effect to dynamic ozone ageing when be used with paraffin, also show outstanding protective effect to static ozone ageing, do not exist normally gush frost problem.The earliest variety 4010NA is still widely used.
6DDP is also commonly used as an anti-aging agent for these substances.Has its reason, it does not cause dermatitis, and other alkyl aryl para-phenylene diamine and dialkyl than para-phenylene diamine, its effect on processing safety, promote the charred tend to be small, with other alkyl aryl and alkyl than para-phenylene diamine, its volatile small, it is excellent stabilizer of SBR, and shows the characteristics of the antioxidants.When the substituents are all aryl groups, they are called p-phenylenediamines. Compared with alkyl aryl p-phenylenediamines, they have low price but low anti-ozone activity. Due to their slow migration speed, these substances have good durability and are effective antioxidants.They have the disadvantage that easy to spray is very low solubility in rubber, but it is very useful in CR because it can produce a good protective effect.And it will not cause the problem of promoting coke burning.
This kind of anti-aging agent is mainly used as an antioxidant, some varieties also have passivation of metal ions.However, the effectiveness of protection is not as good as amine anti-aging agents, the main advantage of this kind of anti-aging agent is non-pollution, suitable for light-colored rubber products.
Blocked phenol, this kind of anti-aging agent is widely used in the anti-aging agent 264, SP compared with other high-molecular weight anti-aging agents, this kind of material has high volatility and poor durability, but this kind of material has moderate protection efficiency.Anti-aging agent 264 can be used in food grade products.
Blocked bisphenol, commonly used varieties are 2246 and 2246S, this kind of material is better than blocked phenol in protection function and non-pollution, but the price is high, this kind of material can provide effective protection for rubber sponge products, also used in latex products.
Polyphenols, mainly refers to the derivatives of p-phenylenediamine, such as 2, 5-ditert pentyl hydroquinone is one of them, this kind of material is mainly used to maintain the viscosity of unvulcanized rubber film and adhesive, but also as a stabilizer of NBR BR.
Organic sulfide antiaging agent
As a stabilizer widely used in polyolefin plastics this kind of anti-aging agent can destroy hydroperoxide type anti-aging agent.Dithiocarbamate and thiol - based benzimidazole are widely used in rubber.Currently, zinc dibutyl dithiocarbamate is widely used.This substance is often used as a stabilizer in the production of butyl rubber.The other is nickel dibutyl dithiamine formic acid (NBC), can improve the NBR, CR, SBR static ozone aging protection.But NR contributes to the kang oxidation effect.
Such as anti-aging agent MB, MBZ, is also one of the commonly used anti-aging agents in rubber, they have a medium protective effect on NR, SBR, BR, NBR.It also has the function of inhibiting the catalytic oxidation of copper ions.This kind of anti - aging agent is often used in light color products.
Non - migratory anti - aging agent
All in the rubber to play a lasting protective effectiveness of the aging agent, called non-migratory aging agent, some also called non-extractive aging agent or persistent aging agent.Compared with general anti-aging agents, it is mainly difficult to extract, difficult to play and difficult to transfer. There are four methods to make anti-aging agents give lasting play to protection efficiency in rubber:
1. Increase the molecular weight of anti-aging agents.
2, in the process of aging and rubber chemical bond.
3. Graft the anti-aging agent onto the rubber before processing.
4. Copolymerize protective monomers with rubber monomers in the manufacturing process.
The latter three are sometimes referred to as reactive or polymer-bonded.