Application Of Partial Esterified Esters Of Styrene-Maleic Anhydride Copolymer To The Dispersion Of Pigment

In this paper, partial esterified esters of styrene-maleic anhydride (SME) with different molecular weight were applied to the surface treatment of phthalocyanine blue pigment. We studied the surface properties of treated phthalocyanine blue pigment including critical wetting surface tension, the surface tension, and the distribution of particle size. We also studied its fluidity and dispersing stability in water. It has been found that the sodium salt of SME has significant effects on the properties of phthalocyanine blue pigment: the critical wetting surface tension of the treated pigment increases with the increase of percentage of the sodium salt of SME added in the pigments; its dispersion component of surface tension has little changes, but the polar component has obvious increase; its distribution of size moves from big size to small one; its fluidity and dispersing stability in water have also been improved greatly. The preferable intrinsic viscosity of SME used in the surface treatment ofphthalocyanine blue pigment is less than 0.37dl/g. The preferable percentage added into the pigments is 5%. Under this condition, its fluidity has increased by 2.3 times, the dispersing stability in water has increased by 31%, the percentage of particles whose diameters are from 0 μ m to 2 μ m has increased by 66%, the critical wetting surface tension has increased by 67%, and the surface tension has increased by 48%.