摘要
以尿素、甲醛及癸酸为原料,利用原位聚合法制备了脲醛树脂包覆癸酸的相变微胶囊。以芯壁质量比、乳化剂用量、乳化转速及固化剂含量为变量设计正交实验,采用ESEM、FTIR和DSC分别表征癸酸微胶囊的微观形貌、化学结构及热性能,利用渗漏率实验测试癸酸微胶囊的防渗性能。结果表明,m(OP-10)∶m(Span-80)=4∶1的复合乳化剂有利于改善癸酸微胶囊颗粒特性。癸酸微胶囊P(芯壁质量比3∶2、乳化剂用量占芯材质量5%、乳化转速1400 r/min、固化剂间苯二酚用量占尿素质量12%)在微观形貌上分散良好且大小均一,相变潜热为123.91 J/g,渗漏率和包覆率分别为6.95%和69.7%,与癸酸微胶囊S(芯壁质量比1∶1、乳化剂用量占芯材质量6%、乳化转速1100 r/min、固化剂用量占尿素质量10%)相比,癸酸微胶囊P的渗漏率降低了57.2%,包覆率反而提高了132.3%,具有良好的热性能。
Phase change microcapsules of capric acid coated with urea-formaldehyde resin were prepared by in-situ polymerization using urea,formaldehyde and capric acid as raw materials.The factors affecting the coating rate of microcapsules such as core-wall mass ratio,emulsifier dosage,emulsifying speed and curing agent content were investigated by orthogonal experiment.The morphology,chemical structure and thermal storage properties of capric acid microcapsules were characterized by ESEM,FTIR and DSC.The anti-seepage property of capric acid microcapsules were tested by leak rate test.The results showed that the composite emulsifier of OP-10 and Span-80 with a mass ratio of 4∶1 could improve the particle characteristics of capric acid microcapsules.When the core-wall mass ratio was 3∶2,the amount of emulsifier dosage accounted for 5%of the core material mass,the emulsifying speed was 1400 r/min,and the curing agent dosage accounted for 12%of urine mass,the prepared capric acid microcapsules P exhibited good dispersion and uniform size.Its latent heat of phase transformation was 123.91 J/g,its leakage rate and coating rate were 6.95%and 69.7%,respectively.Compared with those of the capric acid microcapsules S(core-wall mass ratio 3∶2,emulsifier dosage accounting for 5%of core material mass,emulsifying speed 1400 r/min,curing agent dosage accounting for 12%of urine mass),the leakage rate of capric acid microcapsules P decreased by 57.2%,while the coating rate increased by 132.3%.Capric acid microcapsules P possessed good thermal properties.
作者
王信刚
陈忠发
徐伟
尹皓
WANG Xin-gang;CHEN Zhong-fa;XU Wei;YIN Hao(School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,Jiangxi,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2019年第11期2207-2212,共6页
Fine Chemicals
基金
国家自然科学基金（51972158T和51562024）
江西省杰出青年人才（20162BCB23014）
南昌大学创新项目（CX2018062)
关键词
相变材料
微胶囊
癸酸
防渗性能
热性能
功能材料
phase change materials
microcapsules
capric acid
anti-seepage performance
thermal property
functional materials
