双层长效光致变色微胶囊的制备

Preparation of long-lasting photochromic microcapsules coated with SiO_(2)

为了扩展光致变色材料在纺织品中的应用,实现可逆型光致变色纺织品,针对光致变色材料容易受到光照、温度、氧气及pH值等因素影响而导致耐光照色牢度性能劣变的问题,设计了一种新型双层光致变色微胶囊的包覆方法,成功将受阻胺类光稳定剂包覆到微胶囊中,并在微胶囊表面形成外层由二氧化硅形成的无机囊壁,然后将制备的光致变色微胶囊掺入透明印花浆料,采用平网印刷工艺得到光致变色印花织物。结果表明:乳化剂添加量为40 g/L,硅酸钠质量浓度为14 g/L时,光致变色微胶囊粒径分布均匀,成型状况很好、包覆完整;光变微胶囊具有良好的光致变色性能,即便是最低光辐照度2,光照8 s,光变印花织物变色前后色差可达11.39,且变色寿命高于40 h。

In order to expand the application of photochromic materials in textiles and realize reversible photochromic textiles,a novel preparation method for double-layer photochromic microcapsule was designed to address the problem of poor light colorfastness caused by the complex and changeable external environment,such as light,temperature,oxygen,pH value and other factors.Herein,the hindered amine light stabilizer was firstly successfully packed into the microcapsules,and a second layer of silica was further formed on the surface of these microcapsules,and then the photochromic microcapsule was mixed with transparent printing paste,the photochromic printed fabric was obtained by flat screen printing process.The results show that when the emulsifier dosage was 40 g/L and the sodium silicate concentration was 14 g/L,the photochromic microcapsules had uniform particle size distribution,good molding condition and complete coating.The photochromic microcapsules have good photochromic properties.Even at the lowest light irradiance of 2 and illumination of 8 s,the color difference before and after color change of photochromic printed fabric can reach 11.39,and the color change life is more than 40 h.