The aim of this research is to develop a novel non-leaching antimicrobial waterborne polyurethane (WPU) leather coating material with covalently attached quaternary phosphonium salt (QPS). The structure of the QPS-bearing WPU has been identified, and their thermal stability, mechanical property, and antimicrobial performance have been investigated. The results reveal that the incorporation of QPS slightly reduces the thermal stability of WPU material but would not affects its usability as leather coating. Despite the presence of hydrophobic benzene in QPS structure, the strong hydration of its cationic groups leads to the increased surface contact angle (SCA) and water absorption rate (WAR) of the films, suggesting that the water resistance of the films needs to be improved for the purpose of leather coatings. Antibacterial tests demonstrate that when the QPS content is 20 wt%, QPS-bearing WPU shows effective antimicrobial activity against bacteria. The WPU containing QPS prepared in this study is a non-leaching antimicrobial material and has great potential application as leather coating.

中文翻译：

---

季phospho盐官能化的新型非浸出抗菌水性聚氨酯皮革涂料的简便制备

这项研究的目的是开发一种新型的具有共价键合的季salt盐（QPS）的非浸出型抗菌水性聚氨酯（WPU）皮革涂料。已经确定了带有QPS的WPU的结构，并研究了它们的热稳定性，机械性能和抗菌性能。结果表明，掺入QPS会稍微降低WPU材料的热稳定性，但不会影响其作为皮革涂料的可用性。尽管QPS结构中存在疏水性苯，但其阳离子基团的强水合导致膜的表面接触角（SCA）和吸水率（WAR）增大，这表明需要改善膜的耐水性用于皮革涂料。抗菌测试表明，当QPS含量为20 wt％时，带有QPS的WPU表现出对细菌有效的抗菌活性。这项研究中制备的含有QPS的WPU是一种非浸出抗菌材料，具有很大的潜在应用作为皮革涂料。