The biggest feature of nitrile reclaimed rubber is excellent oil resistance, which can produce a variety of oil-resistant rubber products. Among the factors affecting the maximum oil resistance of nitrile regenerated rubber, the acrylonitrile content of nitrile rubber reclaimed rubber itself, so many customers prefer to use high-acrylonitrile NBR reclaimed rubber when choosing nitrile reclaimed rubber, but in actual production. Is the acrylonitrile content in the nitrile reclaimed rubber really higher?
Xiao Bian once discussed with everyone about the effect of acrylonitrile content on the oil resistance, heat resistance, cold resistance, and chemical stability of nitrile reclaimed rubber. It is no longer listed here in small series, and interested parties can search the site. "Acrylonitrile content affects the performance of nitrile reclaimed rubber" article. Acrylonitrile is one of the important monomers in the nitrile reclaimed rubber, which not only affects the oil resistance and heat resistance of the nitrile reclaimed rubber, but also has a great influence on the flexibility, elasticity, and permanent compression of the product. The higher the acrylonitrile content, the better the quality of the nitrile reclaimed rubber.
The higher the content of acrylonitrile in the nitrile regenerated rubber, the higher the cohesive energy density of the nitrile regenerated rubber itself, the higher the solubility parameter, the higher the polarity, the lowering of the internal molecular chain flexibility, the increase of the interchain forces, and the decrease of the double bond content. , Saturation increases, resulting in different acrylonitrile content of nitrile rubber reclaimed rubber performance differences, you can look from both good and bad:
The higher the content of acrylonitrile in a nitrile reclaimed rubber, the higher the oil resistance of nitrile reclaimed rubber, the better the antistatic performance, the improvement of air tightness, the increase of tensile strength, the better wear resistance, and the better aging resistance. 2 At the same time, due to the increase of acrylonitrile content in the nitrile reclaimed rubber, the internal molecular chain flexibility will be reduced, the softness and elasticity of the nitrile reclaimed rubber will be deteriorated, the compression set will increase, the processing performance will be worse, and the low temperature resistance And the electrical insulation performance has dropped.
It can be seen that the acrylonitrile content of nitrile rubber reclaimed rubber products is not as high as possible, which is determined according to the needs of rubber products: if you only produce rubber products with excellent oil resistance, reclaimed rubber with high acrylonitrile content is naturally the most suitable However, if urethane sealing products such as seals and seals are produced, acrylonitrile-based reclaimed rubber with high acrylonitrile content but large compression deformation and poor elasticity is not suitable. Nitrile reclaimed rubber with high rubber content and acrylonitrile content of about 40% has a high oil resistance coefficient, good feel elasticity, high fineness, and is easy to plasticize. It can directly replace nitrile rubber to produce various extruded or molded oil-resistant rubber products. , Wear-resistant and shock-absorbing products, or with nitrile rubber significantly reduce the cost of raw materials.
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