Research on Particle Size Influence Factors of Organic Pigment Microencapsulation

摘要

Microencapsulation of organic pigments can effectively improve the pigments' wettability and its dispersion. And controlling the particle size and its uniformity can significantly enhance its performance. The benzidine yellow microcapsules were prepared by single coacervation. The microcapsules had the core of benzidine yellow and the wall of the chitosan. The influences of the core/wall ratio, the emulsifier's dosage, pH value, and curing agent's dosage on the particle size of the microcapsules were investigated. The experimental results show that the core/wall ratio, the emulsifier's dosage, and pH change had the great influence on particle size. However, curing agent's dosage had less impact on particle size but more on its encystation effect. Controlling the parameters can effectively regulate the effect of microcapsules' encystment and provide uniform particle size distribution.