分散剂对红色颜料分散体系稳定性的影响及其在白板笔墨水中的应用

以高分子化合物——聚乙烯醇缩丁醛(PVB)、聚氧乙烯聚氧丙烯嵌段共聚物(F68)、聚乙烯吡咯烷酮(PVP)及其分别与非离子型表面活性剂脂肪醇聚氧乙烯醚(AEO-6)复配作为分散剂,研究不同分散剂对醇溶性白板笔墨水红色颜料分散体系稳定性的影响。通过离心分离-吸光度测试、粒径分析判断其稳定性;通过流变性测试探究高分子化合物与AEO-6之间的作用关系。将稳定性好的分散剂用于制备红色白板笔墨水,并通过流变性测试、粒径分析表征墨水的稳定性能。结果表明,采用3种高分子分散剂的红色颜料分散体系稳定性好,且添加质量分数为1%PVB的体系稳定性最佳。在高分子分散剂与AEO-6复配分散的颜料体系中,高分子分散剂对体系稳定性起主导作用,AEO-6并没有起到明显的作用。在红色白板笔墨水中,PVB分散的墨水体系稳定性最佳,此结果与红色颜料分散体系相一致。

Effects of dispersants on stability of the red pigment dispersions and its application in White-Board-Marker ink

The effects of dispersants on stability of the red pigment dispersions in alcohol-soluble ink for white-board-marker have been studied in this paper. The non-ionic surfactant fatty alcohol polyoxyethylene ether (AEO-6), polymeric dispersant polyvinyl butyral (PVB), polyoxyethylene polyoxypropylene block copolymer (F68), polyvinyl pyrrolidone (PVP) and its mix respectively with AEO-6 were investigated regarding this purpose. The stability of the red pigment dispersion was evaluated by centrifugal separation-absorption spectrophotometry tests and particle size analysis. And in order to explore the interaction between polymer and surfactant, the rheological behaviour of the dispersions was tested. Finally, the dispersants which made the dispersion with good stability were used to prepare red white-board-marker ink, and the stability of ink was characterized through rheological tests and particle size analysis. The results show that the stability of the red pigment dispersions is considerably improved by the polymeric dispersants. Particularly the dispersion with the mass fraction of 1% PVB has exhibited excellent stability properties. In the pigment dispersions with the mixture of polymer and AEO-6, polymeric dispersants play a significant role, AEO-6 does not play a main role. The red white-board-marker ink which dispersed by PVB has excellent stability properties. This result is consistent with the red pigment dispersion.