中文摘要：

以聚氨酯为壁材、偶氮染料分散于乙酸丁酯中作为囊芯,采用原位聚合法制备了聚氨酯包覆光致变色化合物的微胶囊。考察了分散剂种类及用量、芯壁质量比、均化速度和搅拌速度以及合成温度对聚氨酯微胶囊粒径的影响。实验结果表明,与Tween80、OP-10、PVC相比,平平加O乳化剂更适合用于聚氨酯微胶囊的制备,且当平平加O用量从5%增加到15%时,微 胶 囊 的 平 均 粒 径 从0.6171μm降 低 到0.5236μm。随着芯壁质量比从1∶1减小到1∶8,聚氨 酯 微 胶 囊 的 平 均 粒 径 从0.4731μm增 大 到0.7147μm。随着均化速度及搅拌速度的增大,微胶囊平均粒径与速度成反比。预聚温度20~60℃,扩链温度90-100℃对聚合和微胶囊平均粒径比较合适。

英文摘要：

Polyurethane was used as wall material. Azo dyes were dispersed in butyl acetate as core materials. The photochromic compound microcapsules coated by polyurethane were prepared via in-situ polymerization. The influences of emulsifier type and its dosage, core/wall ratio, homogenization speed, stirring speed and synthesis temperature on the particle size of the microcapsules were investigated. The experimental results showed that peregal O emulsifier was more suitable for the preparation of polyurethane microcapsules than TweenS0, OP-10 and PVC, the average particle size of microcapsules decreased from 0. 6171μm to 0. 5236μm as the pere- gal O concentration increased from 50% to 15%. With the reduction of the core/wall weight ratio in the range from 1 ： 1 to 1 ： 8, the average particle size improved from 0. 4731μm to 0. 7147μm. The average particle size of the microcapsules was inverse to the speeds while homogenization speed and stirring speed increased. 20-60℃prepolymerization temperature and 90-100℃ chain extension temperature were appropriate for polymerization and average particle size of microcapsules.