高能电子束辐射交联丁腈橡胶/聚氯乙烯胶辊生胶

High energy electron beam irradiation for producing crosslinked nitrile butadiene rubber/polyvinyl chloride raw rubber cots

分别采用高能电子束辐射(EB)以及传统硫磺硫化制备丁腈/聚氯乙烯硫化胶,研究了吸收剂量对硫化胶性能、结构的影响,以及两种硫化工艺制得的硫化胶各项性能及结构间的差异。实验结果表明:EB硫化中,随着吸收剂量增大,硫化胶交联程度提高,断裂截面更加平滑,玻璃化转变温度向高温区移动,结晶度提高,且当吸收剂量为150 kGy时,硫化胶性能最优,EB硫化胶凝胶份数为97.2%,交联密度为2.12×10^−3 mol/g,较硫磺硫化胶分别提高了7%、15%;断裂强度为20.83 MPa,较硫磺硫化胶降低了17.7%;硬度、回弹性分别为90HA、13,分别提高了7%、100%;耐磨性下降。EB硫化较传统硫磺硫化的硫化胶截面更加光滑,玻璃化转变温度、结晶度相差不多。性能可满足纺纱用胶辊产品的最低使用要求,硫化时间缩短了40 min,硫化效率提高了66.5%。

Nitrile butadiene rubber/polyvinyl chloride vulcanized rubber was prepared by high-energy electron beam(EB)irradiation and sulfur vulcanization.The effects of the absorbed dose and of these two curing processes on the properties and structure of the vulcanized rubber were examined.Increasing the absorbed dose during EB curing increased the vulcanized rubber crosslinking density,glass temperature,and crystallinity,and caused the fracture section to become smoother.Optimal EB vulcanized rubber properties were observed when the absorbed dose was 150 kGy,which provided a gel fraction of 97.2%and a crosslinking density of 2.12×10^-3 mol/g,both of which were 7%and 15%higher than those provided by sulfur vulcanization,respectively.Furthermore,the tensile strength of the EB-cured rubber was 20.83 MPa,which was 17.7%lower than that of the sulfur-vulcanized rubber.The hardness increased by 7%to 90 HA and the impact resilience increased by 100%to 13,while the wear resistance decreased.These properties meet the minimum requirements for spinning cots;also,the curing time decreased by 40 min and the curing efficiency increased by 66.5%.