pH值对低甲醛残留相变微胶囊性能的影响  

Influence of pH on the Performance of Low Formaldehyde Residual Phase Change Microcapsules

作　　者：王书颖 黄崇杏[3] 王军[1,2] 卢立新 高德 WANG Shuying;HUANG Chongxing;WANG Jun;LU Lixin;GAO De(School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China;Jiangsu Key Laboratory of Advanced Food manufacturing Equipment and Technology,Wuxi 214122,China;Light Industry and Food Engineering College,Guangxi University,Nanning 530004,China;Ningbo Institute of Technology,Zhejiang University,Ningbo 315100,China)

机构地区：[1]江南大学机械工程学院,江苏无锡214122 [2]江苏省先进食品装备制造技术重点实验室,江苏无锡214122 [3]广西大学轻工与食品工程学院,广西南宁530004 [4]浙江大学宁波理工学院,浙江宁波315100

出　　处：《材料科学与工程学报》2020年第6期1008-1013,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(BK20151128);中央高校基本科研业务费重点资助项目(JUSRP51403A);江苏省333工程资助项目(BRA20131360);浙江省自然科学基金资助项目(LY16A020004)。

摘　　要：以正十四烷为芯材,密胺树脂为壁材,采用原位聚合法制备相变微胶囊,改变传统制备工艺,将三聚氰胺分三次加入制备预聚体溶液。将溶液pH值调至2~5制备多组试样,探究pH值对相变微胶囊残余甲醛含量、相变性能、表观形貌等性能的影响。结果表明,pH值在2~4范围内可成功制取微胶囊;pH值在3.5~3.7范围内,制备的微胶囊球形完整,粒径分布均匀,残余甲醛含量低。当pH值为3.7时,制备的微胶囊残余甲醛含量最低为46.68mg·g-1。三聚氰胺三次加入法可有效降低微胶囊的残余甲醛含量。Melamine-formaldehyde(MF)prepolymer was prepared by incorporating formaldehyde once and melamine for three times.N-tetradecane was selected as the core,melamine-formaldehyde phase change microcapsules(MF MicroPCMs)were synthesized by in-situ polymerization.Emulsion pH was adjusted to 2 to 5 to prepare several samples and effect of pH on the remnant formaldehyde content,thermal properties and surface morphology of MF MicroPCMs was investigated.It is shown that samples with pH in the range of 2 to 4 can successfully fabricate MicroPCMs.When pH is in the range of 3.5-3.7,synthesized MicroPCMs are featured as smooth surface,good disparity,uniform particle size distribution and low remnant formaldehyde content.Microcapsules with the lowest residual formaldehyde content are prepared at pH 3.7 whose formaldehyde concentration is 46.68 mg·g-1.It can be certified that improved synthesis process is excessively beneficial to reduce the remnant formaldehyde content of MicroPCMs.

关 键 词：密胺树脂 相变微胶囊 PH值 残余甲醛含量 

分 类 号：TB34[一般工业技术—材料科学与工程]