Effect of Dispersing Agents on the Quality of Water Based Inkjet using Black Pigment

摘要

Objective of the present research was to study some dispersing agents for carbon black pigment in an aqueous based inkjet ink. The experiment tested on 6 different surfactants which were alcohol ethoxylate, ethylenediamine ethyleneoxide propyleneoxide blockcopolymer, polypropylene glycol blockcopolyme, sodium dodecyl sulphate, sodium polycarboxylate and polymerized naphthalene sulfonate having CMC in a range of 0.01 to 1 %wt studied by measuring surface tension and conductivity of their solution. The black pigment sediment was observed by leaving on a shelf for 30 days. The amorphous particle of the carbon black pigment had a size average in a range of 0.14-0.24 μm dispersed in the inks. The pigmented inks prepared from polymeric dispersants: alcohol ethoxylate and polymerized naphthalene sulfonate gave a high optical density. The pigmented inks which had a small and narrow size distribution gave good inkjet printing runability comparatively.