安全脲醛树脂相变微胶囊制备及性能  

Preparation and Performance of Security Urea-Formaldehyde Resin Phase Change Microcapsules

作　　者：宋晓秋[1] 刘钦矿 段玉萍[1] 曹龙迪 杨改霞[1] 叶琳[1] 

机构地区：[1]上海应用技术学院香料香精技术与工程学院,上海201418

出　　处：《高分子材料科学与工程》2015年第7期129-134,共6页Polymer Materials Science & Engineering

基　　金：上海市"联盟计划"(LM201318)

摘　　要：采用原位聚合法以脲醛树脂为壁材,正十六烷为芯材,制备了有机相变微胶囊（OMPCMs）。优化了影响OMPCMs中甲醛含量的合成条件：尿素与甲醛摩尔比、尿素分批加料方式、固化终点pH值、反应时间及三聚氰胺与聚乙烯醇的用量。采用傅里叶变换红外光谱、透射电镜、热重分析仪、差示扫描量热仪分别对OMPCMs的组成、外貌形态、热稳定性及热焓值进行表征。实验结果表明,尿素与甲醛摩尔比为1∶1.6,尿素分65%,30%,5%共3批加料,固化终点pH为1.0-1.5,反应时间为4h,三聚氰胺与聚乙烯醇的用量均为尿素用量3%时所制备的OMPCMs为类球形,具有核壳结构,游离甲醛含量约为0.392g/kg,符合欧洲E3级标准（甲醛含量小于0.6g/kg）的规定。同时,OMPCMs的包埋率为56%,相变潜热为115.6J/g,耐热温度达到160℃。The organic phase change microcapsules（OMPCMs）were prepared by in-siu polymerization with urea-formaldehyde resin as outer membrane and n-hexadecane as core.The synthesis conditions affecting formaldehyde content of OMPCMs were optimized,such as urea/formaldehyde ratio,urea batch feeding methods,curing end pH value,reactive time,amount of melamine and polyvinyl alcohol（PVA）.The structure and composition,appearance,morphology,thermal stability,enthalpy of the OMPCMs were investigated by Fourier infrared spectroscopy（FT-IR）,transmission electron microscopy（TEM）,thermal gravimetric analysis（TG）and differential scanning calorimetry（DSC）.The experiments show that when urea/formaldehyde mole mratio is 1∶1.6,microcapsules are prepared by adding 3% of melamine and 3% of PVA under the urea batch feeding methods of 65%,30%,5%and curing end pH value of 1.0~1.5for 4h.The prepared microcapsules are spherical with a clear core-shell structure and formaldehyde content is 0.392g/kg meeting the European E3level（the content of formaldehyde less than 0.6g/kg）standards.The n-hexadecane encapsulation efficiency is56%,The phase change latent heat of microcapsules is 115.6J/g and the heat temperature rises up to 160 ℃.

关 键 词：微胶囊 正十六烷 脲醛树脂 包埋率 甲醛含量 

分 类 号：TQ323.3[化学工程—合成树脂塑料工业]