基于电泳沉积工艺的低黏附抗菌涂层的制备

Preparation of low adhesion antibacterial coating based on electrophoretic deposition

以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、甲基丙烯酸二甲氨基乙酯(DMAEMA)、甲基丙烯酸羟丙酯(HPMA)和乙烯基硅油(Vi-PDMS)为单体,合成了乙烯基硅油改性聚丙烯酸酯。将其与六亚甲基二异氰酸酯三聚体(HDIT)固化剂共混,利用电泳沉积工艺,阳离子树脂带动功能性单体定向移动到阴极表面与羟基反应并沉积,经过交联固化后,进一步负载纳米银杀菌剂,获得了兼具抗细菌黏附与杀菌功能的涂层。采用FTIR、^(1)HNMR、SEM对涂层进行了表征,采用光学接触角测量仪测试了涂层的水接触角和滑动角,对其抗细菌黏附性能及杀菌性能进行了测试。结果表明,成功合成了兼具低黏附与杀菌功能涂层。涂层表面具有优异的防油污、细菌及猪血黏附的能力,涂层对大肠杆菌和金黄色葡萄球菌的抗细菌黏附效果达到99.9%以上。即使经过强酸、强碱等极端环境以及摩擦3000次后,涂层表面仍具有优异的防液体黏附效果。

Vinyl silicone oil(Vi-PDMS) modified polyacrylate was prepared from methyl methacrylate(MMA),butyl acrylate(BA),dimethylaminoethyl methacrylate(DMAEMA),hydroxypropyl methacrylate(HPMA),and Vi-PDMS,and then blended with hexamethylene diisocyanate trimer(HDIT) curing agent.The mixture,after crosslinking and curing under electrophoretic deposition by which cationic resin drove the functional monomers to move selectively to the cathode surface for reaction with hydroxyl groups and deposition,nanosilver antibacterial agent was further loaded to obtain a coating with both low adhesion and bactericidal functions.The dual functional coating was then characterized and analyzed by FTIR,^(1)HNMR,SEM,and the water contanct angle and sliding angle of the coating were tested by optical contact angle meter,followed by evaluation on its antibacterial adhesion and bactericidal performance.The results showed that the coating exhibited low adhesion and bactericidal functions with excellent oil,dirt,bacteria and pig blood adhesion resistance.The anti-bacterial adhesion rate of the coating against E.coli and S.aureus exceeded 99.9%.Even after exposure to extreme conditions such as strong acid,strong alkali,and 3000 cycles of friction,the coating surface still maintained excellent anti-liquid adhesion effect.