超分散剂对紫色中性墨水颜料分散影响及应用

研究了超分散剂聚环氧乙烷-稠环芳烃嵌段共聚物的用量、研磨时间等对颜料紫23粒径、热稳定性及离心稳定性的影响。通过TEM观察墨水微观分散状态，并结合FTIR分析分散剂对颜料紫23的作用机制。结果表明：添加质量分数为15%的超分散剂，2800r/min研磨2.5h，紫色色浆粒径可达138nm，且分散稳定性最佳。该分散剂与颜料紫23的吸附作用推动力应为分散剂的疏水基团（稠环芳烃）与颜料紫23结构中苯环结构通过π-π堆积作用发生吸附，从而引起C—H键的红外吸收发生变化。用自制紫色色浆调制的中性墨水，触变值为5.47，符合国家标准，该墨水长期储存性、线条落墨情况、耐水性均较好。

Effect of super dispersant on dispersion of violet gel Ink pigment and its application

The effects of the dosage and grinding time of the super dispersant polyethylene oxide-thick cyclic aromatic hydrocarbon block copolymer on the particle size, thermal stability and centrifugal stability of pigment violet 23 were studied. The microscopic dispersion of ink was observed by TEM, and the mechanism of dispersant on pigment violet was analyzed by infrared spectroscopy. The results showed that the particle size of the purple paste was up to 138nm, and the dispersion stability was the best, after grinding for 2.5h with 15% super-dispersant. The adsorption between the dispersant and the pigment violet is driven by the adsorption of the hydrophobic group of the dispersant -- the thick cyclic aromatic hydrocarbon and the benzene ring structure of the pigment violet 23 by accumulation, which causes the infrared absorption change of the C-H bond. The thixotropic value is 5.47, which is in line with the national standard. And the long-term storage of ink, line, hydrolytic resistance are better.