调控丙烯酸酯橡胶交联程度对丙烯酸酯橡胶/聚甲醛热塑性硫化胶性能的影响  

Effect of regulating crosslinking degree of acrylic rubber on properties of acrylic rubber/polyoxymethylene thermoplastic vulcanizates

作　　者：黄鑫 公维颖 邓涛[1] HUANG Xin;GONG Wei-ying;DENG Tao(School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《合成橡胶工业》2025年第1期44-50,共7页China Synthetic Rubber Industry

摘　　要：以丙烯酸酯橡胶(ACM)、聚甲醛(POM)和热塑性聚氨酯弹性体为原料,六亚甲基氨基甲酸二胺(HMDC)为硫化剂,采用动态全硫化工艺制备了ACM/POM热塑性硫化胶(TPV),通过调控HMDC的用量研究了ACM交联程度对其硫化特性和ACM/POM TPV物理机械性能、动态力学性能、耐老化和耐油性能及力学松弛特性的影响。结果表明,随着HMDC用量的增加,ACM硫化时的转矩增大,其交联程度提高;当HMDC用量为1.8份(质量,下同)时,ACM/POM TPV的拉伸强度达到峰值、储能模量升高、损耗模量降低,拉伸应力松弛的不可松弛模量显著升高、松弛速率降低。当HMDC用量为2.1份时,ACM/POM TPV耐老化性能最佳,热氧老化后的拉伸强度和扯断伸长率变化率分别为2.87%和-4.05%,热油老化后的拉伸强度和扯断伸长率变化率则分别为-6.89%和-3.38%。Acrylate rubber(ACM)/polyoxymethylene(POM)thermoplastic vulcanizates(TPV)were prepared by dynamic full-vulcanization process with ACM,POM and thermoplastic polyurethane elastomer as raw materials,and hexamethylene diamine carbamate(HMDC)as vulcanizing agent,and the effects of the crosslinking degree of ACM on its curing characteristics and the physical and mechanical properties,dynamic mechanical properties,aging resistance,oil resistance and mechanical relaxation characteristics of ACM/POM TPV were investigated by regulating the HMDC amount.The results showed that with the increase in the HMDC amount,the torque during ACM vulcanization increased and the crosslin-king degree of ACM increased.When the HMDC amount was 1.8 phr(mass,similarly hereinafter),tensile strength of ACM/POM TPV reached the peak value,storage modulus increased and loss modulus decreased,non-relaxable modulus of tensile stress relaxation increased significantly,and relaxation rate decreased.When the HMDC amount was 2.1 phr,the aging resistance of ACM/POM TPV was the best,and the change rates of tensile strength and elongation at break after thermo-oxidative aging were 2.87%and-4.05%,respectively,while the change rates of tensile strength and elongation at break after hot-oil aging were-6.89%and-3.38%,respectively.

关 键 词：丙烯酸酯橡胶 热塑性硫化胶 表观交联密度 硫化特性 物理机械性能 动态力学性能 耐老化性能 耐油性能 力学松弛特性 

分 类 号：TQ333.97[化学工程—橡胶工业]