瞬间乳化在界面聚合法制备石蜡相变微胶囊中的应用

APPLICATION OF INSTANT EMULSIFICATION IN PREPARING MICROENCAPSULATED PHASE CHANGE MATERIALS BY INTERFACIAL POLYMERIZATION TECHNIQUE

实验以甲苯-2,4二异氰酸酯(TDI)和哌嗪(PIP)为单体,以界面聚合法制备石蜡MEPCM。考察了油酸质量分数、氢氧化钠质量分数、皂化反应时间、乳化速度对MEPCM成形和粒径的影响。实验结果表明:在油酸质量分数为1%,氢氧化钠质量分数为0.5%,皂化反应时间为5 s,搅拌速率为10 000r/min的条件下制备的MEPCM的平均粒径达到4.1μm,并具有良好的蓄热调温性能;瞬间乳化法制备的MEPCM平均粒径及粒径分布均优于普通乳化方法,可应用于界面聚合法制备MEPCM。

The purpose of this study is to reduce the average diameter of the microencapsulated phase change materials（MEPCM）prepared by interracial polymerization technique using an instant emulsion method. Paraffin MEPCM was prepared by interracial polymerization technique using toluene-2,4-di- isocyanate （TDI） and piperazine （PIP） as monomers. Influences of oleic acid concentration, sodium hydroxide concentration, saponification time and emulsification rate on formation and diameter of the microcapsules were discussed. Results indicated that the average diameter of MEPCM prepared with oleic acid concentration of 1%, sodium hydroxide concentration of 0.5 %, saponification time of 5 seconds and emulsification speed of 10 000 r/min could be 4.1 m, and the MEPCM obtained showed good thermal regulating capacity. The average diameter and diameter distribution of MEPCM prepared by instant emulsification method are better than that of common emulsification method; it can be used for MEPCM preparation by interracial polymerization technique.