超声波辅助制备超细粒径双壳相变储湿胶囊及其性能

ULTRASONIC ASSISTED PREPARATION OF DOUBLE-SHELL PHASE CHANGE HUMIDITY STORAGE CAPSULES WITH ULTRAFINE PARTICLE SIZE AND ITS PERFORMANCE

采用超声波技术辅助制备以正十八烷为核材、甲基丙烯酸甲酯为内壳、壳聚糖为外壳的超细粒径双壳相变储湿胶囊,考察乳化剂、引发剂、交联剂对超细粒径双壳相变储湿胶囊的粒径分布、相变调温性能、储湿调湿性能与微观形貌的影响。结果表明:超细粒径双壳相变储湿胶囊的最佳工艺参数:正十八烷(N-O)用量5.0 g、司盘-80用量1.0 g、吐温-80用量0.5 g、十六烷基三甲基溴化铵(CTAB)用量0.2 g、十二烷基硫酸钠(SDS)用量0.3 g、苯乙烯(St)用量5.0 g、偶氮二异丁腈(AIBN)用量0.3 g、甲基丙烯酸甲酯(MMA)用量3.5 g、壳聚糖(C)用量3.0 g、二乙烯基苯(DVB)用量0.2 g、四乙烯五胺(TEPA)用量0.2 g、超声波功率700 W。超细粒径双壳相变储湿胶囊的粒径分布为124.60~389.10 nm,其中d50=217.63 nm;超细粒径双壳相变储湿胶囊具有良好的相变调温性能与储湿调湿性能,即相变温度为26.75~29.53℃、相变焓为70.67~72.84 J/g、渗透率为6.45%~7.52%,相对湿度35%~65%的平衡含湿量为0.0583~0.1276 g/g、损耗率为5.71%~6.90%。

Double-shell phase change humidity storage capsule was prepared by ultrasonic technology using noctadecane as core material,methyl methacrylate as inner shell,chitosan as outside shell,which presented ultrafine particle size. The effect of emulsifier,initiator and crosslinking agent on particle size distribution,phase change temperature controlling performance,humidity storage humidity controlling performance and microstructure of the capsules was investigated. The results revealed that the best process parameters of double-shell phase change humidity storage capsules:n-octadecane(N-O)amount is 5.0 g,Span-80 amount is 1.0 g,Tween-80 amount is 0.5 g,cetyltrimethyl ammonium bromide(CTAB)amount is 0.2 g,sodium lauryl sulphate(SDS)amount is 0.3 g,styrene(St)amount is 5 g,azodiisobutyronitrile(AIBN)amount is 0.3 g,methyl methacrylate(MMA)amount is 3.5 g,chitosan(C)amount is 3.0 g,divinyl benzene(DVB)amount is 0.2 g,tetraethylenepentamine(TEPA)amount is 0.2 g,ultrasonic power is 700 W. The capsules presented particle size distribution from the 124.60 nm to 389.10 nm,with d50 of217.63 nm. And also,the double-shell phase change humidity storage capsules showed good phase change temperature controlling performance and humidity storage humidity controlling performance,such as phase transition temperature is26.75-29.53 ℃,phase change enthalpy is 70.67-72.84 J/g,permeability is 6.45%-7.52%,equilibrium moisture content is 0.0583-0.1276 g/g in relative humidity of 35%-65% and attrition rate of 5.71%-6.90%.