Xinhua Xu nitrile rubber.

Xinhua Xu nitrile rubber abbreviation NBR. Butadiene and acrylonitrile copolymer prepared by a synthetic rubber. Nitrile rubber hydraulic seal its excellent oil resistance, said Shi, oil resistance after polysulfide rubber, acrylic rubber and fluorine rubber, nitrile rubber hydraulic seal in addition also has good abrasion resistance, aging and air tightness, but ozone resistance, electrical insulation and resistance to cold than the poor, and better conductivity.

Nitrile rubber hydraulic seals in the rubber industry and therefore have a wide range of applications. NBR acrylonitrile content (%) 42 ~ 46,36 ~ 41,31 ~ 35,25 ~ 30, 18 ~ 24 and so on five. Acrylonitrile content, the more oil the better, but the cold is correspondingly reduced. It can be used in an oil or in the long-term 150 ? 120 ? in air. In addition, it has good water resistance, air tightness and excellent bonding properties. Widely used in making a variety of oil and rubber products, a variety of oil washers, gaskets, hydraulic seals, hydraulic O-rings, and other materials, become essential elastic material in the automotive, aerospace and other industries ,,.

NBR world's annual output of about 400kt, about 3% of the total output of synthetic rubber, ranking seventh. Use of nitrile rubber emulsion continuous production. Its process is similar to the SBR. The temperature can be 30 ? or about 5 ?, the conversion rate is generally maintained at 70% to 85%.

Nitrile rubber hydraulic seals production process has the following features:

? Hydraulic seals nitrile rubber relatively strong polar monomers acrylonitrile, resulting in the latex during polymerization is not stable, the greater the amount of acrylonitrile, the poorer the stability of the latex.

Alkaline or acidic ? nitrile rubber hydraulic seal polymerization medium is too strong or too high a temperature will cause hydrolysis of the cyano group, namely: the resulting acid will destroy the emulsifier, which is one of the causes of latex instability.

? nitrile rubber hydraulic seal the hydrolysis reaction of intermediate amide group and cyano group in the polymer chain at higher temperatures, are likely to carry out the crosslinking reaction, so that product quality deterioration.

? hydraulic seals nitrile rubber and acrylonitrile butadiene reactivity ratios differ quite far (at 40 ? were 0.3 and 0.02), therefore, the copolymer composition and distribution of the monomer, the dependence of the conversion rate larger. By batch of acrylonitrile added approach can improve cyano distribution. Nitrile rubber intermolecular chain force is stronger, greater hardness, it is more difficult to process, in which the polymerization temperature is 30 ? the obtained PS most difficult process, the need to advance on a chill roll after plasticized before operation. Often used to more effectively regulate the molecular weight of the industrial and the polymerization temperature was reduced to 5 ?, in order to reduce side reactions to improve its processability. On the other hand, also through a variety of nitrile rubber such as neoprene rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber and synthetic resins such as polyvinyl chloride, phenolic resin blends (see Polymer Blends thereof), so that the performance is improved.

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Shenzhen Xu Xinhua Rubber Products Co., Ltd.