【摘要】 水性聚氨酯(PU)乳液干燥后,表面膜层连续致密,对油墨的吸收能力差,影响油墨的干燥和色彩还原。为了提高PU膜层对油墨的吸收,通过加入纳米氧化铝粉体砂磨,得到了浆料,在支持体上涂布得到了PU吸墨涂层。研究了不同纳米粉体含量对涂层透光率及色块实地密度的影响,不同软、硬段PU对图像分辨率和耐水性的影响。实验发现,涂层的透光率随着纳米粉体的增加而降低;用硬段PU得到的涂层,墨滴扩散小,图像的分辨率比软段PU的高,而且硬段涂层上油墨的实地密度较高。同时,印刷色块在硬段PU的涂层上有更好的耐水性能。更多还原

【Abstract】 Water-based polyurethane forms continuous and dense film after fully drying.Ink is lowly absorbed by PU film,affecting drying rate and color reproduction.In order to improve the absorption of ink on PU film,PU/nano alumina compound was prepared by adding nano alumina in PU and stirring at high speed.PU ink absorption coating was got by being coated on the substrate.The influences of different content of nano alumina to transmittance of coating and solid density of color blocks were researched.The influences of soft and hard segment of PU to image resolution and water resistance were also researched.It can be seen that transmittance reduces when content of nano alumina increases.Droplets spread less when using PU of hard segment and image resolution and solid density are also higher.At the same time,water resistance of solid blocks is much better when printed on PU of hard segment.更多还原