Research on Particle Size Influence Factors of Organic Pigment Microencapsulation
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 b
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Research on Particle Size Influence Factors of Organic Pigment Microencapsulation Zhengrong Yan, Qiong Xue, Chunyan Du and Jingjing Du
Abstract 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. Keywords Chitosan
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Size control Coacervation Organic pigment
Introduction
Printing ink is a uniform mixture composed of pigment, ink vehicle, fillers, and additives [1]. Along with the continuous renewal of printing process and its development, especially the emergence of high-speed printing, higher requirements on the application properties of the organic pigment such as transparency, tinting strength, and gloss are put forward. Pigment is evenly dispersed in aqueous oily ink medium. In order to make it disperse good and wettability, pigment must be carried on surface modification. The microencapsulation of organic pigment is one of the good ways to improve [2].
Z. Yan Q. Xue (&) C. Du J. Du College of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou, Hunan, China e-mail: [email protected] © Springer Science+Business Media Singapore 2016 Y. Ouyang et al. (eds.), Advanced Graphic Communications, Packaging Technology and Materials, Lecture Notes in Electrical Engineering 369, DOI 10.1007/978-981-10-0072-0_112
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Microencapsulation is an embedding technology that makes tiny core materials such as solid, liquid, and gas embed inside wall material consisting of natural or synthetic polymer compounds [3, 4]. Microcapsule technology began in the late 1940s and since then has developed for 70 years. Along with the development of science, microencapsulation is becoming more and more mature and has been widely applied in the areas of medicine, food, cosmetics, ink, pesticide, etc. [5–9]. The preparation of organic pigment microencapsulation can improve wettability and dispersion of pigment particles in the ink medium, which can significantly increase their application performance [10, 11]. Microencapsulation of organic pigment had been successfully made by single coacervation with benzidine yellow as core material and natural polymer chitosan as wall material. The influences of the core/wall ratio, the emulsifier’s dosage, pH value, flocc
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