Nitrile reclaimed rubber is a reclaimed rubber made from waste nitrile rubber, while nitrile rubber is obtained by the copolymerization of acrylonitrile and butadiene, in which the content of acrylonitrile directly affects the performance of nitrile butadiene rubber and the raw material of nitrile butadiene rubber The performance of nitrile reclaimed rubber is also affected by acrylonitrile content.
First of all, let's see what is acrylonitrile? Acrylonitrile is a colorless liquid with an irritating smell, slightly soluble in water, easily soluble in most organic solvents, and has a strong reaction with oxidants, strong acids, alkali, amines and bromine and is an important rubber in the field of rubber monomer. Acrylonitrile content in nitrile rubber directly affects various properties of nitrile rubber.
1, acrylonitrile content of nitrile rubber oil resistance: nitrile rubber in the presence of acrylonitrile, nitrile rubber makes non-polar or low-grade solvent performance has strong stability, especially gasoline and aliphatic hydrocarbon oils, Therefore, nitrile rubber oil resistance superior to other rubber. The higher acrylonitrile content in nitrile rubber, the stronger the oil resistance.
2, Acrylonitrile content affects the chemical stability of nitrile rubber: The chemical resistance of nitrile rubber is better than that of natural rubber, which is due to the acrylonitrile and acrylonitrile inside the nitrile rubber can improve the stability of the rubber structure. It should be noted here is: nitrile rubber chemical stability, but it is less resistant to strong oxidizing acid.
3, acrylonitrile content of nitrile rubber heat resistance: heat resistance of nitrile rubber second only to EPDM, which is because acrylonitrile nitrile rubber structure can not only reduce the degree of molecular unsaturation, and Due to the strong electron-withdrawing ability of cyano group, the allyl hydrogen position is relatively stable, so that the heat resistance of nitrile rubber is better than that of common rubbers such as natural rubber and styrene-butadiene rubber. When acrylonitrile content in the right formula appropriate, the maximum temperature up to 130 ℃, in hot oil resistant to 150 ℃ high temperature. Therefore, the level of acrylonitrile directly affects the heat resistance of nitrile rubber.
In addition, the cold resistance of nitrile rubber with the acrylonitrile content decreased.
According to the level of acrylonitrile, nitrile rubber can be divided in five kinds, namely: very high acrylonitrile rubber (content above 43%), high acrylonitrile rubber (content 36-42%), high acrylonitrile rubber Content of 31-35%), acrylonitrile rubber (content of 25-30%) and low acrylonitrile rubber (content of 24% or less).
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