The preparation of environment friendly gelatin-gum arabic microcapsule for electrophoretic display

China) Abstract: The microencapsulated display device is the main choice for electrophoretic display. The application of environment friendly dispersion medium is very critical for the commercialization of this technology. The electrophoretic microcapsules using Isopar L, which is non-toxic, low aromatic concentration and volatility, as dispersion medium were prepared by complex coacervation between gelatin and acacia. The influence of the weight ratio of capsule material to core material, pH value, dispersion time and rate on the properties of microcapsules was investigated. Optimized technology was defined as follows: the ratio of capsule material to core material is 1:4, the microcapsule wall is cured at pH=8.5 with the temperature of 45 °C, the disperse time and rate was 20 min and 800 rpm, respectively. The particle size and yield of the microcapsule prepared under optimized conditions were 30-60 μm and 83.88%, respectively. The contrast ratio of the electrophoretic display device used the prepared microcapsules was as high as 2.09.