论文部分内容阅读
讨论了反应温度、聚合反应时间、原料配比、溶剂用量等因素对羧基亚硝基氟橡胶(CNR)聚合反应影响,并通过硫化加工考核了聚合橡胶的基本力学性能。结果表明:降低反应温度有利于提高橡胶分子量,延长反应时间可提高单体转化率和橡胶收率,四氟乙烯适当过量不会造成橡胶分子量和酸含量的明显变化;硫化点单体加料摩尔分数在0.72%以下时,橡胶酸含量随其加入量增大成比例提高,随后趋向平衡;综合橡胶分子量和反应控制,溶剂二氯甲烷用量为单体总质量的75%较合适。硫化橡胶的力学性能测试显示,其拉伸强度、扯断伸长率分别达到了9.0MPa和400%;扯断永久变形率、压缩永久变形率分别低于22%和20%,显示橡胶具有很好的密封性能。
The effects of reaction temperature, polymerization time, the ratio of raw materials and the amount of solvent on the polymerization of carboxyl nitroso fluororubber (CNR) were discussed. The basic mechanical properties of the polymerized rubber were evaluated by vulcanization. The results showed that reducing the reaction temperature was beneficial to increasing the molecular weight of rubber and prolonging the reaction time to improve the monomer conversion and rubber yield. The appropriate excess of tetrafluoroethylene would not cause obvious change of molecular weight and acid content of rubber. Below 0.72%, the content of rubber acid increases with the increase of the amount of rubber acid, then tends to balance; The synthesis of rubber molecular weight and reaction control, the amount of solvent methylene chloride 75% of the total mass of the monomer is more appropriate. The mechanical properties of the vulcanized rubber showed that the tensile strength and elongation at break reached 9.0MPa and 400%, respectively. The values of permanent set and tensile set under 22% and 20%, respectively, showed good rubber The sealing performance.