自着色水性聚氨酯制备及其在棉织物涂层中的应用

为解决低分子染料的耐热迁移性差和涂层色浆配制时外添加涂料、染料等着色剂的烦琐性,将1-氨基-4-羟基-2(6-羟基己氧基)蒽醌通过共价键引入水性聚氨酯骨架中合成端羟基自着色水性聚氨酯。借助红外光谱仪、紫外-可见光谱仪和热重分析仪研究了自着色水性聚氨酯的化学结构和热稳定性。考察了蒽醌发色体质量分数、固化剂质量分数和焙烘条件对涂层棉织物K/S值、色牢度和手感的影响。结果表明:随着自着色水性聚氨酯制备过程中蒽醌发色体质量分数增加,涂层棉织物K/S值增大;当固化剂质量分数为20%,于150 ℃焙烘5 min,涂层棉织物K/S值为5.20,干、湿摩擦色牢度为4~5级,褪色牢度为3~4级,沾色牢度为4~5级,手感为3级。

Synthesis of self-colored waterborne polyurethane and its application in coating of cotton fabric

Hydroxyl terminated self-colored waterborne polyurethane was synthesized by covalently bonding 1-amino-4-hydroxy-2-(6-hydroxy-hexyloxy) anthraquinone into waterborne polyurethane skeleton to solve the poor thermal migration of low molecular dye and complexity of pigment, dye or extra colorant for coating slurry. The chemical structure and thermal stability were studied by Fourier transform infrared spectrometer, ultraviolate-visible spectrometer and thermal gravity analysis. The effects of chromophore mass fraction, curing agent mass fraction and baking conditions on K/S value, color fastness and hand feeling were investigated. Results show that the K/S value of coated cotton fabric increases with the increase of anthraquinone chromophore dosages in the preparation of self-colored waterborne polyurethane. The K/S value of coated cotton fabric is 5.20 under the condition of 20% curing agent and baking at 150 ℃ for 5 min. The dry rubbing fastness and wet rubbing fastness are 4-5 grade. The fading fastness can reach 3-4 grade and staining fastness is 4-5 grade. The hand feeling is 3 grade.