封闭型异氰酸酯固化剂的合成及应用  

Synthesis and application of blocked isocyanate curing agent

作　　者：张余利 夏英 杨博翔 张李 刘志伟 刘灵芝 王书唯 Zhang Yuli;Xia Ying;Yang Boxiang;Zhang Li;Liu Zhiwei;Liu Lingzhi;Wang Shuwei(School of Textile and Material Engineering,Dalian Polytechnic University,Dalian 116034,Liaoning,China)

机构地区：[1]大连工业大学纺织与材料工程学院,辽宁大连116034

出　　处：《中国胶粘剂》2023年第8期43-47,共5页China Adhesives

基　　金：辽宁省教育厅A类项目(LJKZ0513);辽宁省教育厅青年科技人才项目(J2019046);“辽宁省‘兴辽英才计划’项目资助”(XLYC1906017)。

摘　　要：采用甲乙酮肟(MEKO)为封闭剂,与三苯基甲烷三异氰酸酯(TTI)反应,制备了封闭型三苯基甲烷三异氰酸酯(B-TTI)。探究了不同温度和不同时间下MEKO和TTI的反应程度。研究结果表明:50℃下MEKO与TTI的反应速率较快,封闭完成后体系内游离异氰酸根的含量降至0.05%以下,反应时间为4 h及以上时,产物储存性能较好;确定了解封温度为120℃左右,解封后会伴随着自聚反应的发生,解封后的产物可以与TTI进行快速固化反应;制备的B-TTI作为固化剂加入到TTI中,当m(B-TTI)∶m(TTI)=2∶10时,粘接效果较好,粘接强度可达4.76 MPa。The blocked triphenylmethane triisocyanate(B-TTI)was prepared by reacting with triphenylmethane triisocyanate(TTI)using methyl ethyl ketoxime(MEKO)as blocking agent.The degree of reaction between MEKO and TTI at different temperatures and different time was explored.The research results showed that at 50℃,the reaction rate between MEKO and TTI was relatively fast.After the blocking was completed,the content of free isocyanates in the system decreased to below 0.05%.When the reaction time was 4 hours or more,the storage performance of the product was good.It was confirmed that the unblocking temperature was around 120℃,selfpolymerization reaction would occur after unblocking,and the products after unblocking could undergo rapid curing reaction with TTI.The prepared B-TTI was added as the curing agent to TTI,when m(B-TTI)∶m(TTI)=2∶10,the bonding effect was good,and the bonding strength could reach 4.76 MPa.

关 键 词：三苯基甲烷三异氰酸酯 甲乙酮肟 封闭型 固化剂 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]