微胶囊相变材料对聚氨酯注浆材料固化放热行为的影响  

Effects of Microencapsulated Phase Change Materials on Exothermic Behavior of Polyurethane Grouting Material During Curing Process

作　　者：樊康鑫 董晓宇 王俊杰 刘志 徐佳乐 王晨曦 齐新慧 张雪敏 丁运生 Kangxin Fan;Xiaoyu Dong;Junjie Wang;Zhi Liu;Jiale Xu;Chenxi Wang;Xinhui Qi;Xuemin Zhang;Yunsheng Ding(Department of Polymer Materials and Engineering,School of Chemistry and Chemical Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Key Laboratory of Advanced Functional Materials and Devices,Hefei 230009,China)

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009 [2]先进功能材料与器件安徽省重点实验室,安徽合肥230009

出　　处：《高分子材料科学与工程》2024年第7期1-9,共9页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(U2001223);国家重点研发计划(2020YFC1909900);安徽省重大科技专项揭榜挂帅类项目(2021e03020008)。

摘　　要：聚氨酯注浆材料在固化时由于芯部热量的聚集会发生热解甚至阴燃,造成材料性能劣化和使用安全性隐患。文中通过将相变蓄热微胶囊引入聚氨酯注浆材料中实现对材料固化放热行为的可控调节。通过界面聚合制备了一系列以聚氨酯为壳、石蜡为芯的微胶囊相变材料(MEPCMs),并与多元醇、催化剂共混后与多异氰酸酯反应制备聚氨酯注浆材料。使用激光粒度仪、差示扫描量热仪、热重分析仪和红外热像仪对所合成的MEPCMs的粒径与热行为进行了表征,并使用旋转黏度计、万能试验机等测试了聚氨酯注浆材料A组分的浆液黏度、固结体的力学性能与固化行为。结果表明,与未改性的聚氨酯注浆材料相比,加入MEPCMs可使固化最高反应温度显著降低,固化时间明显延长,固化放热速率降低。随着MEPCMs含量的增加,A组分浆液黏度增加,固结体强度下降。当MEPCMs质量分数为15%时,A组分浆液黏度为551.9 m Pa·s,固化最高反应温度为98.7℃,固化时间为235 s,固结体压缩及拉伸强度分别为44.9 MPa和14.7 MPa。所制备的相变材料改性的聚氨酯注浆材料在保持良好的浆液可注性、固结体强度及热稳定性的同时,实现了对固化放热行为的调控。During the curing process of polyurethane grouting material,thermal decomposition or even smoldering of the material will occur due to the accumulation of heat in the core,resulting in deterioration of material performance and potential safety hazards in use.In this study,microencapsulated phase change materials were introduced into the polyurethane grouting material to achieve a controllable adjustment of the exothermic behavior during its curing process.A series of microencapsulated phase change materials(MEPCMs)with polyurethane as shell and paraffin wax as core were prepared by interfacial polymerization and blended with polyols and catalysts,and then reacted with polyisocyanates to prepare polyurethane grouting materials.The particle size and thermal behavior of the synthesized MEPCMs were characterized by laser particle size meter,differential scanning calorimeter,thermogravimetric analyzer,and infrared thermography.The slurry viscosity,mechanical properties of the cured material and curing behavior of the component A of polyurethane grouting material were tested by rotational viscometer and universal testing machine.The results show that compared with the unmodified polyurethane grouting material,the addition of MEPCMs significantly reduces the maximum exothermic temperature during its curing process,increases the curing time,and reduces the heat release rate.With the increase of MEPCMs content,the viscosity of the component A increases,and the strength of the cured material decreases.When the mass fraction of MEPCMs is 15%,the slurry viscosity of componentAis 551.9 mPa·s,the maximum exothermic temperature is 98.7℃,the curing time is 235 s,and the compressive and tensile strengths of the cured material are 44.9 MPa and 14.7 MPa,respectively.The prepared polyurethane reinforcing materials modified with phase change materials achieve ideal thermal stability,while maintaining an ideal slurry injectability,strength of solid body and thermal stability.

关 键 词：微胶囊相变材料 聚氨酯 注浆材料 固化放热 

分 类 号：TV42[水利工程—水工结构工程]