水性聚氨酯-丙烯酸酯包覆颜料色浆在涂料染色中的应用

为提高涂料染色色浆分散稳定性，简化染色工艺流程，以颜料聚丙烯酸酯为核、聚氨酯为壳，采用无皂乳液聚合法制成了水性聚氨酯丙烯酸酯包覆颜料色浆，用于棉织物涂料轧染。借助纳米粒度仪与透射电子显微镜对有色乳液平均粒径及分布、颗粒形貌进行分析；通过调节浸轧工艺配方中海藻酸钠用量，改变浸轧次数与焙烘温度优化染色工艺条件。结果表明：水性聚氨酯丙烯酸酯包覆颜料乳胶粒具有明显的核壳结构，平均粒径为126 nm；染色配方中海藻酸钠质量分数为0.2%，二浸二轧，80 ℃烘干，140 ℃焙烘，染色织物得色量较高；经柔软整理，织物手感较好，干摩擦牢度达到4~5 级，湿摩擦牢度达到4级，皂洗褪色牢度达到4 级。

Application of waterborne polyurethane-acrylate coated pigment

In order to improve the stability of the paste form of pigment and facilitate the pigment dyeing process, awaterborne polyurethane-acrylate coated pigment adhesives was preparedfrom polyurethane as shell and pigment-polyacrylate as core by emulsifier-free emulsion polymerization. It was used for pigment pad dyeing of cotton fabric. The size distribution, mean diameter and surface morphology of polymer emulsions were characterized by nanometer particle sizer and transmission electron microscopy. The pigment dyeing process was optimized by adjusting the dosage of waterborne polyurethane-acrylate coated pigment adhesives, sodium alginate, padding process and drying and curing parameters on the padding process. The results showed that waterborne polyurethane-acrylate coated pigment latex particles exhibit obvious core-shell structure.The mean diameter is 126 nm. The dyed fabrics also show higher coloration when the dosage of sodium alginate is 0.2%, pre-dryed at 80 °C and cured at 140 °C by two-dipping-two-padding. The dyed fabrics displayed good flexibility after softening finishing with dry crocking fastness up to 4-5 level, wet crocking fastness up to 4 level and soaping fastness reached grade 4.