为提高聚氨酯丙烯酸酯（ PUA）乳液的稳定性及固色性能，首先，利用高碘酸钠将海藻酸钠分子中的羟基部分氧化为醛基；然后，通过席夫碱反应与肉桂酰胺进行接枝，得到改性海藻酸钠（HMSA），用其配制 PUA光固化乳液对涂料印花织物进行固色。系统研究 HMSA对 PUA乳液稳定性及其成膜性质的影响，并通过摩擦牢度、水洗牢度、接触角测试等对涂料在棉织物上的固色效果进行表征。结果表明： HMSA可使 PUA乳液获得更小、更均匀的液滴，并使乳液的电位绝对值增大，乳液的稳定性也获得提高。此外， HMSA能增强 PUA固化膜耐酸碱、耐醇处理能力。同时光固化 HMSA/PUA体系也能将涂料颗粒包覆于织物表面，减少其在摩擦、水洗过程中脱落的几率，有效提高固色牢度。

In order to improve the stability and color fixation of polyurethane acrylate（PUA）resin，firstly，sodium periodate was used to oxidize the hydroxyl groups in sodium alginate molecule to aldehyde groups，and then cinnamamide was grafted through Schiff base reaction to obtain modified sodium alginate（HMSA）， the prepared UV-curable PUA emulsion was used to complete color fixation of pigment printed fabrics. The influence of HMSA on the stability and film forming properties of PUA emulsion was systematically studied，and the fixation effect of the coating on cotton fabric was characterized through tests such as friction fastness，washing fastness，and contact angle. The results showed that HMSA could make PUAemulsion obtain smaller and more uniform droplets，and increase its absolute potential and stability. In addition，HMSA could enhance the acid-base and alcohol-resistant ability of the film. Meanwhile，the UV curable HMSA/PUA system could coat the coating particles on the surface，reduce the probability of their falling off in the process of friction and washing，and thus effectively improve the color fastness.