封闭型有机硅改性阳离子水性聚氨酯的合成及其应用

Synthesis and application of blocked silicone modified cationic waterborne polyurethane

为改善活性染料染色棉织物的湿摩擦色牢度,以端羟基侧胺基硅油为改性剂,丁酮肟为封闭剂,通过红外光谱监测封闭反应进程,合成了封闭型有机硅改性阳离子水性聚氨酯(BSC-WPU),并将其用于染色棉织物的整理。研究了端羟基侧胺基硅油的引入对乳液稳定性、整理织物表面形貌及其应用性能的影响。结果表明:引入端羟基侧胺基硅油后制备的BSC-WPU具有优异的乳液稳定性,将其用于染色织物的整理,能在纤维表层形成均匀光滑的聚合物膜,实现对纤维的良好"包覆";相比封闭型阳离子水性聚氨酯(BS-WPU),BSC-WPU能够提升染色织物湿摩擦色牢度1. 5级,提高织物手感1级,且整理织物无甲醛检出。

Blocked silicone modified cationic waterborne polyurethane (BSC-WPU)was synthesized using hydroxyl-terminated silicone with pendant amine groups (HSPAG)as the modifier and methylethylketoxime as the end-capping reagent.The obtained polyurethanes were then applied in the finishing of cotton fabric dyed with reactive dyes in order to improve its wet rub fastness.The influence of HSPAG on the emulsion stability of waterborne polyurethane (WPU),surface morphology of finished fabric and application properties of BC-WPU and BSC-WPU were studied.BSC-WPU exhibits excellent emulsion stability and forms a uniform smooth polymer film to coat the fabric fibers after finish.Compared with BC-WPU,the wet rub fastness of dyed fabric improved significantly and the wet rub fastness is improved by 1.5 degree with BSC-WPU.Moreover,the softness of finished fabric was increased by 1 degree.These results indicated the environment friendly BSC-WPU without formaldehyde could be a candidate for improving the wet rub fastness of fabric and hand feel at the same time.