低甲醛、高芯壁比相变微胶囊的制备及其热性能  

Preparation and thermal properties of phase change microcapsules with low formaldehyde content and high core-wall ratio

作　　者：罗成林 赵路通 秘一芳 曹志海[1] LUO Chenglin;ZHAO Lutong;MI Yifang;CAO Zhihai(Key Laboratory of Advanced Textile Materials and Manufacturing Technology,Ministry of Education,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学先进纺织材料与制备技术教育部重点实验室,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2022年第1期23-30,共8页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(51573168)。

摘　　要：相变微胶囊的储能能力以及环保性是决定其应用价值的关键指标。选用熔点为28℃的石蜡芯材,通过原位聚合并结合除醛处理,制备低甲醛、高芯壁比的三聚氰胺甲醛(MF)相变微胶囊。通过红外光谱、差示扫描量热仪、扫描电镜等对MF相变微胶囊的结构、形貌和性能进行了表征,探究芯壁比对MF相变微胶囊热性能的影响。结果表明:石蜡经过微胶囊化后,不仅可以防止石蜡泄露,还能提高石蜡的热稳定性;MF相变微胶囊呈现良好的表面形貌,在水中具有良好的分散性;通过调控芯材与壁材的比例,MF相变微胶囊包覆率可高达93.3%,焓值为214.5 J/g;通过分批次加入三聚氰胺制备预聚体的方式,可有效地将MF相变微胶囊甲醛残留量从361.3 mg/kg降低至317.7 mg/kg,在此基础上添加40%的尿素可以将甲醛残留量进一步降低至121 mg/kg。The energy storage capacity and environmental friendliness of phase change microcapsules are the key indicators to determine their application value. In this paper, the melamine-formaldehyde(MF) phase change microcapsules with low formaldehyde and high core-wall ratio were prepared by using paraffin core material with a melting point of 28 ℃, via in situ polymerization and aldehyde removal. The structure, morphology, and properties of MF phase change microcapsules were characterized by infrared spectroscopy, differential scanning calorimetry and scanning electron microscopy, etc., and the impact of core-wall ratio on the thermal properties of MF phase change microcapsules was explored. The results indicate that the microencapsulation of paraffin can not only prevent the leakage of paraffin, but also promote the thermal stability of paraffin. MF phase change microcapsules have good surface morphology and good dispersibility in water. By adjusting the ratio of core material to wall material, the encapsulation ratio of MF phase change microcapsules reaches 93.3%, and the enthalpy value is 214.5 J/g. More importantly, by adding melamine in batches to prepare prepolymers, the formaldehyde residue in MF phase change microcapsules can be effectively lowered from 361.3 mg/kg to 317.7 mg/kg. On this basis, adding 40% urea can further reduce the formaldehyde residue to 121 mg/kg.

关 键 词：原位聚合 相变微胶囊 三聚氰胺甲醛树脂 低甲醛 高芯壁比 

分 类 号：TQ323[化学工程—合成树脂塑料工业]