What are the properties of nitrile rubber?
NBR has excellent oil resistance. In a typical NBR structure, the trans form accounts for about 78%. Because NBR contains cyano groups in its molecular chain structure, its oil resistance (such as mineral oil, liquid fuel, animal and vegetable oil and solvent resistance) is better than natural rubber, neoprene rubber and styrene butadiene rubber. Compared with other rubbers, NBR has a wider range of use temperature. Its long-term use temperature is 120°C. At the same time, NBR has good low temperature resistance, and the lowest glass transition temperature can reach -55°C.
NBR has good chemical resistance and good processing performance. As the relative density of the acrylonitrile content in its structure increases, the vulcanization speed increases, and the tensile strength performance increases, but the resilience performance decreases and the cold resistance deteriorates. Since the cyano group in NBR is easily polarized by the electric field, the dielectric performance is reduced, and it is a semiconducting rubber. NBR can be divided into 5 categories: ultra-high, high, medium-high, medium and low acrylonitrile according to the level of ACN content. There are two production methods: continuous and batch polymerization. The continuous polymerization method is usually used for small variety and large-volume production, with low consumption. The batch polymerization method is suitable for multi-variety and small batch production, and the construction consumption is high.
