Dong Chenghao, Xin Wei, Luo Yunjun
School of Materials Science and Engineering, Beijing Institute of Technology Beijing 100081 P. R. China
RSC Adv. 2018 Dec 18;8(73):42041-42048. doi: 10.1039/c8ra09123d. eCollection 2018 Dec 12.
In order to improve the stability of waterborne polyurethane fixative during the color-fixing treatment, a novel environment-friendly cationic waterborne polyurethane (CWPU) containing quaternary ammonium groups was synthesized from isophorone diisocyanate, polypropylene glycol, butanone oxime, and -methyl dihydroxyethyl allyl ammonium chloride (MDAAC) and dispersed in water by using diethylenetriamine as the post-chain extender. The structures of the MDAAC and CWPU were characterized by H-NMR and FTIR. Effects of -value, MDAAC content, post-chain extender and blocking agent on the properties of the waterborne polyurethane emulsion and the rubbing fastness of the treated dyed cotton fabrics were investigated. The investigation results showed that the -value and the cationic group content of the cationic waterborne polyurethane had no significant effect on the color-fixing performance, but the content of DETA had a great influence on the wet-rubbing fastness. The wet rubbing fastness of the treated cotton fabrics was promoted from grade 1-2 to grade 3. Furthermore, the quaternary ammonium groups were able to provide the surface charges for the stabilization of the resulting polymer in alkaline electrolyte solution which met the requirements of practical applications.
为提高水性聚氨酯固色剂在固色处理过程中的稳定性，以异佛尔酮二异氰酸酯、聚丙二醇、丁酮肟和甲基二羟乙基烯丙基氯化铵（MDAAC）为原料合成了一种含季铵基团的新型环保阳离子水性聚氨酯（CWPU），并以二乙烯三胺为后扩链剂将其分散于水中。采用核磁共振氢谱（H-NMR）和傅里叶变换红外光谱（FTIR）对MDAAC和CWPU的结构进行了表征。研究了-值、MDAAC含量、后扩链剂和封闭剂对水性聚氨酯乳液性能及处理后染色棉织物摩擦牢度的影响。研究结果表明，阳离子水性聚氨酯的-值和阳离子基团含量对固色性能影响不显著，但二乙烯三胺（DETA）含量对湿摩擦牢度影响较大。处理后棉织物的湿摩擦牢度从1-2级提高到3级。此外，季铵基团能够在碱性电解质溶液中为所得聚合物的稳定提供表面电荷，满足实际应用的要求。
