Evaluation of the Pigment Dispersion of UV-Curable Inkjet Ink Using UV Absorption Spectrum

With the formulation experiment to design the UV inkjet ink of different pigment/binder ratios, UV inkjet ink samples of different dispersions are prepared. The size and distribution of pigment particles and UV absorption spectrum of the samples are then tested. The result indicates that: the pigment/binder ratio has a great impact on the dispersion of the UV inkjet ink, when the ratio is 2:1, the ink sample can obtain good dispersion; dispersion of the pigment particles affects the intensity of UV absorption of the ink system. The absorption spectrum has a strong dependence with the dispersion of ink. With the decreasing of the pigment particle size, the UV absorption intensity of the ink system increases. The main innovation of this study lies in the establishment of evaluating particle's dispersion according to the change of UV absorption spectrum of the ink system.