Vulcanized nitrile butadiene rubber

Vulcanization system nitrile butadiene rubber mainly uses sulfur and sulfur-containing compounds as curing agents, but also can be vulcanized with peroxide or resin. As most nitrile-butadiene rubber products require small compression permanent deformation, low-sulfur and sulfur-containing compounds are often used, and sulfur-containing compounds (sulfur-free vulcanization system) or peroxides are used as curing agents. Sulfur accelerator system is the most widely used curing system of nitrile butadiene rubber. Sulfur can be used either sulfur powder or insoluble sulfur. As the solubility of sulfur in nitrile-butadiene rubber is lower than that of natural rubber, attention should be paid to controlling the amount of sulfur. With the increase of the amount of sulfur, the tensile stress and hardness increased, and the heat resistance decreased, but the oil resistance increased slightly and the cold resistance changed little. General soft rubber because the unsaturation of nitrile butadiene rubber is lower than that of natural rubber, the amount of sulfur needed can be less, generally 1.5 phr, vulcanization accelerator can be slightly more than natural rubber, commonly used 1 phr 3.5 phr. The optimum amount of sulfur for soft vulcanizate of nitrile rubber is about 1.5 phr. The amount of sulfur required for nitrile-butadiene rubber with different acrylonitrile content is not the same. When the content of acrylonitrile is high and the relative content of butadiene is low, the amount of sulfur required can be reduced due to the reduction of unsaturation. For example, butyronitrile-18, sulfur 1.75 phr, butyronitrile-26, 1.5 phr and 1.75 phr, have good comprehensive properties. The combination of low sulfur can improve the heat resistance of vulcanizate, reduce the compression permanent deformation and improve other properties, so nitrile butadiene rubber often adopts low sulfur (less than 0.5 phr of sulfur) and high accelerating curing system.


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It is not only an important basic industry of the national economy, but also a national leading industry.
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It should be noted that to improve the tensile strength of rubber, appropriate methods need to be selected according to the specific conditions, and experimental verification should be carried out. At the same time, other performance indicators such as aging resistance and medium resistance need to be considered to ensure that the quality of the final product meets the requirements.