超低温热致变色复合物的制备与微胶囊包封研究

Study on fabrication of ultralow temperature thermochromic material and packing with microcapsule

为了拓宽低温可逆热致变色材料变色温度和变色时间的范围,以聚乙二醇400(PEG400)为辅剂,十二醇等为隐色剂,变色母料为显色剂,无水乙醇为溶剂制备了超低温热致变色复合物;采用原位聚合法制备了以阿拉伯树胶为壁材,热致变色复配物为芯材的微胶囊,并对其进行显微结构、粒径、变色温度和变色时间等方面的测试与分析。结果表明:使用十二醇时,变色温度为5~15℃,变色时间为210s,颜色按照深蓝-蓝色-浅蓝的顺序变化。聚氨酯的引入使变色膜变色温度下降,但降幅较小,可以起到保温隔热的作用。微胶囊化后材料具有优良的耐疲劳性能,还扩展了变色材料的应用领域。

In order to widen the alow temperature thermochromic temperature and time of materials,polyethylene glycol 400,lauryl alcohol,color masterbatch and anhydrous ethanol were used as adjuvant,chromophore,developer and solvent,respectively.The microcapsule was prepared with acacia gum by the method of in-situ polymerization as the outer membrane and organic reversible thermochromatic material as core material.Microstructure observation,grain size analysis,temperatures and time at which the color of capsule began to change were measured.The results indicated that the material of using lauryl alcohol：the thermochromic temperature were between 5℃ and 15℃ ,thermochromic time was 210 s,color was a variation of deep blue-blue-light blue.The introduction of PU can let the color film decresed in the color changing temperature slightly,acting as effect of heat preservation and heat insulation.In addition,the microcapsule basically had excellent resistance aging.And the usable range of material was enlarged.