What is imported butadiene rubber o O-ring? Butadiene rubber is made from butadiene and acrylonitrile via emulsion polymerization. It is mainly produced by low-temperature emulsion polymerization, with good oil resistance, high abrasion resistance, good heat resistance and strong adhesion. Its disadvantages are poor low temperature resistance, poor ozone resistance, poor electrical performance, and slightly low elasticity. Butadiene rubber is mainly used to manufacture oil resistant rubber products.
Butadiene rubber o Introduction to V-seal ring: English name: nitrile butadiene rubber It is also called NBR 。 It is prepared by copolymerization of butadiene and acrylonitrile synthetic rubber 。 It is oil resistant ( Especially alkane oil ) Synthetic rubber with good aging resistance. Acrylonitrile content in butadiene rubber (%) yes forty-two ～ forty-six 、 thirty-six ～ forty-one 、 thirty-one ～ thirty-five 、 twenty-five ～ thirty 、 eighteen ～ twenty-four Wait five kinds. The more acrylonitrile content, the better oil resistance , However, the cold resistance decreased accordingly. It can be used in one hundred and twenty ℃ in air or in one hundred and fifty ℃ oil for long-term use. In addition, it also has good water resistance, air tightness and excellent bonding properties. It is widely used for making various oil resistant rubber products and various oil resistant Washer , gasket, sleeve, flexible packaging, flexible hose, printing and dyeing cots Cable Glue materials have become essential elastic materials in automobile, aviation, petroleum, copy and other industries.
Butadiene acrylonitrile butadiene rubber NBR , average molecular weight seventy About 10000 yuan. Grayish white to light color massive or powdery solid, relative density zero point nine five ～ one 。 The content of acrylonitrile is 26% Butadiene rubber Glass Melting temperature Tg= one fifty-two ℃, embrittlement temperature Tb= one forty-seven ℃, while acrylonitrile content is 40% Glass transition temperature of butadiene rubber Tg= one twenty-two ℃。 Solubility parameter δ =8.9 ～ nine point nine , soluble in ethyl acetate, butyl acetate, chlorine benzene , methyl ethyl ketone, etc. Butadiene rubber has excellent oil resistance, which is only inferior to polysulfide rubber and fluororubber, and has wear resistance and air tightness. The disadvantage of butadiene rubber is that it is not resistant to ozone and aromatic, halogenated hydrocarbon, ketone and ester solvents, and is not suitable for insulation materials. The heat resistance is better than that of styrene butadiene rubber and chloroprene rubber one hundred and twenty ℃ long-term operation. Air tightness is second only to butyl rubber. The properties of butadiene rubber are affected by acrylonitrile content. With the increase of acrylonitrile content, the tensile strength, heat resistance, oil resistance, air tightness and hardness increase, but the elasticity and cold resistance decrease. Butadiene rubber has poor ozone resistance and electrical insulation performance. Good water resistance.
Butadiene rubber o The function of the V-shaped seal ring: the butadiene rubber has very strong compatibility with other polymers in general, but it has good compatibility with chloroprene rubber, modified phenolic resin, PVC and other polymers with strong compatibility, especially with chlorine containing polymers, and is often used in combination. In addition, in order to improve processability and service performance, butadiene rubber is often used together with non comparative rubber such as natural rubber, styrene butadiene rubber and cis-1,4-polybutadiene rubber. It should be pointed out that NBR is characterized by good oil resistance, and when used together with other polymers (except PVC), there is a trend to reduce oil resistance.
High performance cyanated butadiene rubber o Type seal ring:
With the development of the automobile industry, strict requirements have been put forward for the heat resistance, oil resistance and chemical corrosion resistance of the sealing materials such as rubber used in automobile fuel and lubrication systems and engines. For a long time, the automobile industry has been using butadiene rubber with good oil resistance. Due to its own defects, only one hundred and twenty Long term use below ℃; Moreover, due to poor ozone resistance, weather resistance and radiation resistance, it can not meet the sealing requirements of motor vehicles such as automobiles for engines. Cyanated butadiene rubber (HNBR) It is the green product of butadiene rubber. It not only has good oil resistance, ozone resistance, abrasion resistance and chemical corrosion resistance, but also has good compression deformation, heat resistance and low temperature resistance, which can be used to manufacture sealing products used under harsh conditions. The effect of vulcanizing agent, vulcanizing aid and carbon black on HNBR The influence of compression time, deformation, tensile strength and other properties.
