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NBR Rubber Products Used In The Manufacture Of Rubber Products

Nitrile rubber is made of butadiene and acrylonitrile by emulsion polymerization, nitrile rubber is mainly produced by low temperature emulsion polymerization, excellent oil resistance, high wear resistance, good heat resistance, strong bonding The The disadvantage is poor resistance to low temperature, poor resistance to ozone, poor insulation performance, slightly lower elasticity. Nitrile rubber is mainly used in the manufacture of oil-resistant rubber products. Referred to as NBR, butadiene and acrylonitrile copolymerization and made of a synthetic rubber. Is oil (especially alkane oil), anti-aging properties of synthetic rubber. The content of acrylonitrile in nitrile rubber is 42 ~ 46, 36 ~ 41, 31 ~ 35, 25 ~ 30, 18 ~ 24 and so on. The more acrylonitrile content, the better the oil resistance, but the corresponding decline in cold resistance. It can be used in air at 120 ° C or in oil at 150 ° C for a long period of time. In addition, it also has good water resistance, air tightness and excellent bonding properties. Widely used in a variety of oil-resistant rubber products, a variety of oil-resistant gaskets, gaskets, casing, flexible packaging, soft hose, printing and dyeing roller, cable plastic materials, in the automotive, aviation, oil, copying and other industries become essential Of elastic material

NBR has excellent oil resistance. The dibenzene monomer can be copolymerized into three different chain structures of cis, trans and 1,2-tentyl. Typical NBR structure in the reverse accounted for about 78%. As the NBR molecular chain structure contains cyano, oil resistance (such as resistance to mineral oil, liquid fuels, animal and vegetable oils and solvents) is better than natural rubber, chloroprene rubber and styrene butadiene rubber. Compared with other rubber NBR has a wider range of temperature, its long-term use temperature of 120oC, while NBR has good resistance to low temperature performance, the minimum glass transition temperature of up to -55oC.

NBR has good chemical stability and good processing performance. With the increase of the relative density of the nitrile content in the structure, the vulcanization speed is accelerated and the tensile strength is improved, but the springback performance is decreased and the cold resistance is deteriorated. Since the cyanide in the NBR is susceptible to the polarization of the electric field, the dielectric properties are reduced, which is a semiconductor rubber. NBR can be divided according to the level of ACN, divided into high, high, high, medium and low acrylonitrile 5 categories. Production methods are divided into two kinds of continuous and intermittent polymerization. Continuous polymerization is usually used for less variety and large production production, low consumption. Intermittent polymerization method for multi-species and small batch production, the use of a small number of polymerization, the construction of high consumption. So far, we can not see the trend of mutual substitution.

Nitrile rubber, although with excellent physical and mechanical properties and processing performance, but long-term use in acidic gasoline and high temperature (150oC) environment, such as fluorine-like glue and acrylic soft plastic, for this German companies, Canadian companies and Japanese companies Developed with excellent hydrogenated nitrile rubber (HNBR). In addition, also developed a very cold and high purity nitrile rubber and shuttle nitrile rubber (XNBR) and so on.

Nitrile rubber has a very strong polarity and is not well compatible with other polymers, but is highly reactive with chloroprene rubber, modified phenolic resin, polyvinyl chloride and other polymers, especially chlorine Polymers have good compatibility and are often used in combination. In addition, in order to improve the processing and the use of performance, nitrile rubber and often with natural rubber, styrene butadiene rubber, butadiene rubber and other non-polar rubber and use. It should be noted that nitrile rubber is characterized by good oil resistance and the use of other polymers (except for polyvinyl chloride) there is a tendency to reduce oil resistance.

High performance hydrogenated nitrile rubber

With the development of the automotive industry, the automotive fuel and lubrication systems and the engine used in sealing materials such as rubber heat, oil, resistance to corrosion of various chemicals, such as the performance of the demanding requirements. For a long time, the automotive industry has been using oil-resistant nitrile rubber, because of its own shortcomings, only 120 ℃ long-term use; and, due to resistance to ozone, weather and radiation resistance is poor, can not meet the motor The vehicle is required to seal the engine. Hydrogenated nitrile rubber (HNBR) is a hydrogenated product of nitrile rubber. It has good oil resistance, ozone resistance, wear resistance and chemical resistance, but also has good compression permanent deformation, heat and low temperature performance, can be used in the manufacture of harsh conditions, the use of sealing products.