Xu Xinhua oil resistance nitrile rubber O-rings

Nitrile rubber O-rings referred NBR. Butadiene and acrylonitrile copolymer prepared a synthetic rubber. Xinhua Xu nitrile rubber O-rings for its excellent oil resistance, said Shi, oil resistance after polysulfide rubber, acrylic rubber and fluorine rubber, nitrile rubber O-rings in addition also has good abrasion resistance aging resistance and air tightness, but ozone resistance, electrical insulation and resistance to cold than the poor, and better conductivity. Xinhua Xu nitrile rubber O-ring production process has the following features:

, Nitrile rubber O-rings polar acrylonitrile monomer, resulting in less stable latex polymerization process, the greater the amount of acrylonitrile, the worse the stability of the latex.

, Nitrile rubber O-ring is too acidic or alkaline medium or high temperature will cause hydrolysis polymerization cyano group, namely: the resulting acid will destroy the emulsifier, which is one of the causes of latex instability.

, Intermediate amide group and a cyano group in the polymer chain nitrile rubber O-rings of the hydrolysis reaction at higher temperatures, are likely to carry out the crosslinking reaction, so that product quality deterioration.

, Nitrile rubber O-rings 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 a batch of acrylonitrile added cyano ways to improve distribution. NBR intermolecular forces stronger chain, the larger the hardness, it is more difficult to process, in which the polymerization temperature of the obtained PS 30 ? most difficult to process, after the required pre-plasticized to operate on a chill roll. 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 NBR rubber such as chloroprene 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.

Xinhua Xu nitrile rubber O-ring quality problems: production quality seal is closely related to the reliability of the final product. The Division has been in production after several visits, research and product testing. In the delivery process, we can provide true, accurate inspection reports.

 

 

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Shenzhen Xu Xinhua Rubber Products Co., Ltd.