自修复双层微胶囊的制备及其在玄武岩织物上的应用

Preparation of self-healing double-layer microcapsules and its application for basalt fabrics

为提高玄武岩织物的抗折性能,首先用原位聚合法制备单层微胶囊,囊壁为三聚氰胺-尿素-甲醛共聚物(MUF),囊芯为环氧树脂;然后将固化剂二氨基二苯砜吸附在单层微胶囊表面,以MUF再次包覆制成双层微胶囊;最后将双层微胶囊涂覆到玄武岩织物表面。测试了微胶囊的微观形貌和化学结构,分析了微胶囊自修复玄武岩织物的自修复性能。结果表明:制备的微胶囊结构致密、表面光滑;当玄武岩纤维受到破坏时,微胶囊破裂流出修复剂和固化剂通过聚合反应生成网络大分子修复裂纹;修复7 d后玄武岩织物的最大断裂强力和折皱回复性能可基本恢复,延伸性能有很大改善,抗折性能得到有效提高。

In order to improve the bending resistance of basalt fabric,a monolayer microcapsules were prepared by in-situ polymerization.The wall of the monolayer microcapsule was melamine urea formaldehyde copolymer(MUF),and the core was epoxy resin.Then the curing agent diaminodiphenyl sulfone was adsorbed on the surface of the monolayer microcapsules,and then coated with MUF to make double microcapsules.Finally,the double microcapsules were coated on the surface of basalt fabric.The micromorphology and chemical structure of the microcapsules were tested,and the self-healing properties of the microcapsule self-healing basalt fabric were analyzed.The results show that the prepared microcapsules has a compact structure and a smooth surface.When the basalt fiber was damaged,the microcapsules releases the repair agent and curing agent to generate a network of macromolecules for repairing the cracks.After 7 d repair,the maximum breaking strength and the wrinkle recovery performance of the basalt fabric is basically restored,with the elongation and the flexural performance effectively improved.