论文部分内容阅读
采用三聚氰胺-甲醛树脂(PMF)为壁材,三羟甲基丙烷三(3-巯基丙酸酯)(TMPMP)作为芯材,原位乳液聚合法制备了TMPMP@PMF微胶囊固化剂。研究了表面活性剂种类及用量,囊壁质量比,反应温度,反应时间,p H值对合成TMPMP@PMF微胶囊粒径及稳定性等影响。结果表明:当反应乳液中芯材的质量达到2%,同时芯材与壁材的单体质量比达到2时,能制备出粒径在100?m,粒径均匀的TMPMP@PMF微胶囊。TMPMP@PMF微胶囊的结构稳定,耐热性好,并且呈闭孔结构。采用TMPMP@PMF微胶囊为固化剂,与环氧树脂(EP)基材混合配制压敏型TMPMP@PMF/EP固化剂,发现微胶囊结构在受到外力作用时能及时破裂,室温甚至低温下都能短时间使环氧树脂固化,并且能够很好地改善固化剂的抗冲击性能。
TMPMP @ PMF microcapsule curing agent was prepared by in situ emulsion polymerization using melamine-formaldehyde resin (PMF) as the wall material and trimethylolpropane tris (3-mercaptopropionate) (TMPMP) as the core material. The effects of the type and amount of surfactants, mass ratio of wall, reaction temperature, reaction time and p H value on the particle size and stability of TMPMP @ PMF microcapsules were studied. The results show that TMPMP @ PMF microcapsules with particle size of 100 μm and uniform size can be prepared when the mass of core material reaches 2% and the monomer mass ratio of core to wall material reaches 2. TMPMP @ PMF microcapsules have stable structure, good heat resistance and closed cell structure. TMPMP @ PMF microcapsule was used as curing agent to prepare pressure-sensitive TMPMP @ PMF / EP curing agent mixed with epoxy resin (EP) substrate. It was found that the microcapsule structure could rupture in time when subjected to external force. Epoxy resin can be cured for a short time, and can well improve the impact resistance of the curing agent.