Study Of Pigment Surface-modified By Styrene Copolymer

Organic pigments were used widely in the areas of textile, plastic, rubber, papermaking, architecture, for their excellent properties. Meanwhile, the uses of organic pigment were restricted partly for the disadvantages, such as weak surface polarity, difficulty dispersant and low fastness. To increase the polarity and rubbing fastness, the pigments were surface-modified by emulsion polymerization and phase separation. The changes of the characters of modified and no-modified pigments were studied, the effect of the technological process and modifier's structure was researched, and the changes of fastness were studied too.C.I.P.R.122 was surface modified by phase separation. The Different structure modifiers were obtained by the polymerizations condition change, such as the ratio of monomers, amount of monomers. The effects of the technological process and modifier's structure for the modified pigment's particle size and centrifugal stability were studied. Satisfactory experimental conditions, as modifier's structure, modifier's amount, grinding speed, the absorption accelerator's dripping acceleration, the pH value of the dispersant system, the amount of the polymeric dispersant were gained. The characters alters of modified pigment were expressed by particle sizes, Zeta potential, contact angle and surface morphology. The results indicated, while the pigment was modified, particle sizes and zeta potential increased with the amount of the modifier increased, contact angle with H2O decreased, surface morphology changed greatly.C. I. P.B. 15:1 was encapsulated by emulsion polymerization with styrene and butyl acrylate. The effects of the amount of surfactants and monomers on the average particle sizes, PDI, stabilities of the system were investigated. The morphologies of the nanoscale particles were observed by the scanning probe microscope. The results indicated, and the average particle sizes would change as the amount of the monomers increase; the amount of the surfactants would affect the average particle sizes and the stabilities of the system; the rubbing fastnesses of the modified pigment were superior than the no-encapsulated pigment.