Preparation of in situ modified hydrogenated nitrile rubber with unsaturated carboxylic acid from biomass

Zinc sorbate (ZDS) reinforced hydrogenated nitrile rubber was prepared using sorbic acid and zinc oxide as raw materials by in situ generation method, and the in situ reaction mechanism of sorbic acid and effect of zinc sorbate on physical and mechanical properties of the hydrogenated nitrile rubber were investigated. The results showed that zinc sorbate could be generated in situ during the vulcanization stage. With increase of addition of sorbic acid and zinc oxide, the crosslinking degree of vulcanizate gradually increased, and tensile strength showed a trend of first increasing and then decreasing. When the addition amount of sorbic acid and zinc oxide were 23 g and 10 g, respectively, the tensile strength reached maximum of 24.5 MPa. Pretreatment of the rubber compound could significantly improve its mechanical properties, but the pretreatment time should not be too long, otherwise the mechanical properties would decrease.