Nanoscale phthalocyanine blue pigment dispersion was prepared using allyloxy Nonyl-phenoxy propanol polyoxyethylene ether ammonium sulfate (ANPS) as dispersant, the effect of amount of ANPS and milling time on particle size were investigated, the further performance of the prepared dispersion was also measured. The results showed that the optimal process condition was that the weight ratio of dispersant to pigment 20%, milling speed 1800r/min for 2 hours. The dispersion which prepared as these conditions had small particle size and narrow particle size distribution, the particle size changed small when the dispersion was treated below 60°C and almost remained the same when pH value was in the range of 6 to 10. The absorbance changed little when the dispersion was centrifuged below 4000r/min for 30min. The fluidity of the dispersion shows shear thinning behavior.
Mingjun Zhang, Shaohai Fu, Anli Tian, Xia Zhang, Chaoxia Wang, "Preparation of Nanoscale Phthalocyanine Blue Pigment Dispersion for Inkjet Printing Inks With Polymerizable Dispersant" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP25), 2009, pp 291 - 294, https://doi.org/10.2352/ISSN.2169-4451.2009.25.1.art00082_1