孔雀石绿-硼酸体系的热变色性能研究

Study on Thermochromic Properties of Malachite Green-Boric Acid Complex

选用羧酸类溶剂,采用固相法合成了孔雀石绿-硼酸系列可逆热致变色材料。考察了孔雀石绿和硼酸的配比、羧酸类溶剂的种类与用量对其热变色性能的影响并探讨了材料的变色机理。结果表明,孔雀石绿-硼酸体系的最佳配比(质量比)为1∶100,最佳溶剂为丙二酸,且m(孔雀石绿)∶m(硼酸)∶m(丙二酸)=1∶100∶10时,颜料变色敏锐,色彩鲜艳,变色温度降低到65℃,复色时间为25 s,可逆性好。DSC检测颜料的热变色过程发现,样品在58-72℃之间出现一个强的吸热峰。复配物体系的变色机理可归结为分子间的电子得失机理。

Applied some kinds of carboxylic acid as solvent, a series of malachite green-boric acid reversible ther-mochromic paints were prepared by solid phase synthesis method. The effects of the mass ratio of malachite green to boric acid, the sort and ratio of carboxylic acid on the thermochomic property of the paint were studied, and the thermochromic mechanism of the materials were presumed. The research results indicated that the best mass ratio（quality ratio） of malachite green to boric acid was 1： 100, the best solvent of malachite green-boric acid was malonic acid. With m （ malachite green） ： m （ boric acid） ： m （ malonic acid ） = 1 ： 100： 10, the paint was sensitive in color changing and the paint＇s color was vivid, the thermochomic temperature reduced to 65℃, the color-recovering time was 25s, and the reversible property was good. The thermochromic process of the paint was investigated by DSC, which showed one big peak of heat absorption at 58～72℃. The thermochromic mechanism of the paint was summarized for the obtaining or losing of the electrons among the molecules.