Hydrophobic copper phthalocyanine blue organic pigment (PB) can be effectively encapsulated by co-poly(styrene-acrylate)via in-situ micro-suspension polymerization.In order to adjust and control the morphology of pigment microcapsules
the effects of homogenization shear rate
agitation speed
dispersant TCP amount and pigment concentration on the particles size and size distribution of polymerization products were investigated.It was found that there was a critical agitation speed of 250 r·in-1 for achieving a stable size and size distribution of dispersed phase during polymerization.TCP amount had a significant effect on the stability of micro-suspension system but a limited effect on particle size control.Homogenization shear rate played an obvious role in controlling particle size
while the effect of pigment concentration on particle size was not obvious.Thus a series of pigment microcapsules with controllable particle size
narrow distribution and high pigment content could be obtained.