纺织品用长效释放生物质精油微胶囊

Biomass microcapsules encapsulating essential oils with long-lasting release properties for textiles

摘要:

为避免囊壳原料对环境造成危害，选择可降解的乙基纤维素（EC）为壁材，通过溶剂蒸发法制备了精油微胶囊。结果表明，搅拌速率对微胶囊粒径和表面微孔有较大影响，当搅拌速率为1200 r/min，EC和精油质量分别为1 g和1.5 g时，微胶囊中值粒径为70.8 μm，包封率为44.3%。通过湿法涂层工艺将制备的精油微胶囊用于吸湿透气型复合织物的制备。通过SEM表征可知，该方法保留了基底原形貌。30 d的释放后仍具有39.2%的香味保留率，这得益于胶囊化后精油中乙酸芳樟酯质量分数提高了27.09%，使精油的储存期延长。拉伸-涂层织物表面微胶囊分布均匀、黏覆量多，香味数值可高达382。拉伸和未拉伸制备的复合织物均具有600 mm/s以上的透气率，水洗5次保香率在35%以上，摩擦50次后质量保持在96%以上。这种复合材料的制备方法简单，可以有效改善透气性和牢度无法兼具的问题。

Abstract:

In order to avoid the harm of capsule raw materials to the environment, degradable ethyl cellulose ether (EC) was selected as the wall material, and essential oil microcapsules were prepared by solvent evaporation. The results showed that the stirring rate had a great influence on the particle size and surface micropores of microcapsules. When the stirring rate was 1200 r/min and the mass of EC and essential oil were 1 g and 1.25 g respectively, the median particle size of the microcapsules was 70.8 μm. The embedding rate was 44.3%. Then, the prepared essential oil microcapsule was used to prepare the hygroscopic and breathable composite fabric through the wet coating process. It could be seen from the SEM that this method retained the original shape of the substrate. The flavor retention rate after 30 days of release was 39.2%. This was due to the fact that the mass fraction of Linalyl Acetate in the encapsulated essential oil increased by 27.09%, which prolonged the storage life of the essential oil. The microcapsules were uniformly and massively distributed on the surface of the stretch coated fabric, making the fragrance value as high as 382. The air permeability of the stretched and un-stretched composite fabrics was more than 600 mm/s, the fragrance retention rate was more than 35% after washing for 5 times, and the quality remains more than 96% after rubbed for 50 times. The preparation method of the composite is simple and can effectively improve the problem that the air permeability and fastness cannot be obtained at the same time.