自修复聚脲甲醛微胶囊的制备及成囊机理研究

Study On Preparation and Mechanism of Self-healing Poly(urea-formaldehyde) Microcapsules

采用原位聚合法制备了自修复聚脲甲醛包覆环氧树脂微胶囊。考察了原料用量、反应温度、酸化值和固化时间等对微胶囊粒径分布和表面形态的影响,确定了微胶囊的最佳制备工艺。借助显微镜实时监测微胶囊化过程,探讨了微胶囊的成囊机理,并将微胶囊填充到脲醛树脂中。结果表明:采用最佳制备工艺制得的微胶囊包覆率较高、结构紧密、粒度均匀,室温下保存一周后没有出现团聚和破裂;将9%微胶囊添加到脲醛树脂中,微胶囊分散均匀,脲醛树脂复合材料的韧性得到提高。

The self-healing poly（urea-formaldehyde） microcapsules were prepared by in-situ polymerization with epoxy resin as the core materials. The optimum preparation technology of microcapsule was determined by studying the effect of raw material amount, reaction temperature, acidification value and curing time on microcapsule particle size distribution and surface morphology. The forming mechanism of microcapsule was investigated by inspecting the forming process of microcapsule. The microcapsule was added into urea-formaldehyde resin. The results show that： the microcapsules with high coating ratio, compact structure, and even particle size are prepared by the optimum prepration technology, the microcapsules can be reserved at room temperature for one week without agglomeration and rupture; adding 9% microcapsules into urea-formldehyde resin, the distribution of the microcapsules is uniform, the toughness of urea-formaldehyde resin composite is improved.