Nitrile rubber is a copolymer of acrylonitrile and butadiene monomer, which is mainly produced by low-temperature lotion polymerization. It has excellent oil resistance, high abrasion resistance, good heat resistance and strong adhesion. Its disadvantages are poor low temperature resistance, poor ozone resistance, poor insulation performance and slightly low elasticity.

NBR has good chemical stability and good processing performance. With the increase of acrylonitrile content in its structure, its relative density increases, the curing rate increases, and the tensile strength increases, but the resilience decreases, and the cold resistance becomes poor. Because the cyano group in NBR is easy to polarize in the electric field, the dielectric property of NBR is reduced, which is semiconductor rubber. NBR can be divided into five categories according to the ACN content: ultra-high, high, medium-high, medium-low acrylonitrile. There are two production methods: continuous polymerization and batch polymerization. The continuous polymerization method is usually used for small variety and large yield production with low consumption. The batch polymerization method is applicable to multiple varieties and small batch production, and the engineering construction consumption is high. [1]

Although nitrile rubber has excellent physical and mechanical properties and processing properties, it is not as good as fluororubber and acrylate rubber in acid gasoline and high temperature (150 ℃) environment for a long time. Therefore, hydrogenated nitrile rubber (HNBR) with excellent performance has been developed. In addition, nitrile rubber and carboxyl nitrile rubber (XNBR) with extremely cold resistance and high purity have also been developed.

Because of its excellent oil resistance and physical and mechanical properties, NBR is widely used in the manufacture of various oil-resistant rubber products, such as O-ring, gasket, hose and fuel tank rubber lining, printing drum, oil tank lining, insulating floor plate, oil-resistant shoe sole, hard rubber parts, fabric coating, pipe thread protection layer, pump impeller, wire sheath, adhesive, film for food packaging, rubber gloves and other fields.