The structural changes of rubber in the process of thermo-oxidative aging can be divided into two categories: one is the thermo-oxidative aging reaction (cracking) mainly based on the degradation of molecular chains; the second type is based on the cross-linking between molecular chains. Aging (structured).
Natural rubber, etc. contain isoprene rubber, butyl rubber, ethylene propylene diene rubber, homopolymeric chlorohydrin rubber and copolymerized chlorohydrin rubber. The appearance of this type of rubber after thermal oxidative aging is soft and sticky.
In the process of thermal oxidation aging of butadiene-containing butadiene rubber, cross-linking reaction occurs mainly. Similar rubber varieties include NBR/SBR/CR/ERDM/FPM/CSM and so on. The appearance of this type of rubber after thermal oxidative aging is hard and brittle.
Since the aging of rubber is a complex comprehensive chemical reaction process, and it is impossible to absolutely prevent the aging of rubber, appropriate measures can be taken to delay the speed of rubber aging, so as to achieve the purpose of prolonging the service life of rubber. Anti-aging measures mainly include physical protection and chemical protection.
The physical protection method refers to avoiding the interaction between rubber and various aging factors as much as possible, such as using surface layer or treatment, adding light shielding agent, adding paraffin, etc.
The chemical protection method refers to adding certain substances to prevent or delay the aging of rubber, such as adding amine or phenolic chemical antioxidants.
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