蓖麻油基双键封端聚氨酯预聚物/混炼型聚氨酯可降解密封材料的制备与性能  

Preparation and properties of degradable sealing materials from castor oil double bond terminated polyurethane prepolymer and millable polyurethane rubber

作　　者：张全胜[1] 吕玮[1] 程凯 李玉宝 李娜 李再峰[2] ZHANG Quan-sheng;Lü Wei;CHENG Kai;LI Yu-bao;LI Na;LI Zai-feng(Research Institute of Petroleum Engineering Technology,Shengli Oilfield Company,SINOPEC,Dongying 257000,China;State Key Laboratory Base of Eco-chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]中国石化胜利油田分公司胜利石油工程技术研究院,山东东营257000 [2]青岛科技大学生态化工国家重点实验室培育基地,山东青岛266042

出　　处：《合成橡胶工业》2020年第6期452-457,共6页China Synthetic Rubber Industry

基　　金：国家科技重大专项(2017ZX05072);国家自然科学基金资助项目(21676150);山东省重点研发计划项目(2018GGX102018)。

摘　　要：以蓖麻油、甲苯二异氰酸酯和甲基丙烯酸羟乙酯为原料制得双键封端聚氨酯预聚物(DTPUP),再将混炼型聚氨酯(MPU)与DTPUP、炭黑及其他橡胶助剂共混制备出新型可降解聚氨酯密封材料,研究了DTPUP用量对复合材料力学性能、降解行为及热稳定性的影响。结果表明,随着DTPUP用量的增加,复合材料的拉伸强度和扯断伸长率均先增大后减小,100%定伸应力、撕裂强度和邵尔A硬度均逐渐增大;复合材料在100℃清水中浸泡的降解效应随DTPUP用量的增加而减弱,当MPU与DTPUP质量共混比为70/30时,复合材料浸泡120 h后拉伸强度保持率最高可达16.1%;复合材料的初始分解温度、硬段和软段的最快分解速率对应的温度随着DTPUP用量的增加均有所提高,即其热稳定性得以改善。Double bond terminated polyurethane prepolymer(DTPUP)was prepared with castor oil,toluene diisocyanate and hydroxyethyl methacrylate as raw materials and then a novel degradable polyurethane(PU)sealing material was prepared via blending millable polyurethane rubber(MPU)with DTPUP,carbon black and other vulcanizing agents.Effect of the content of DTPUP on mechanical pro-perties,degradation behavior and thermal stability of the composites were investigated.The results showed that tensile strength and elongation at break of the degradable PU composites all increased first and then decreased,and 100%tensile strength,tear strength and shore A hardness increased gradually with an increase in the content of DTPUP.Degradation rate of the composites in 100℃water decreased with an increase in the content of DTPUP.When the content of DTPUP was 30 phr,the retention rate of mechanical properties of the composites could be up to 16.1%after being immersed for 120 h.The initial decomposition temperature and the temperature corresponded to the maximum decomposition rate of hard segment and soft segment all increased with an increase in the content of DTPUP,which indicated thermal stability of the composites was improved.

关 键 词：可降解材料 混炼型聚氨酯 蓖麻油 双键封端预聚物 密封材料 降解行为 

分 类 号：TQ334.1[化学工程—橡胶工业]