纳米ZnO-氧化石墨烯及ZnO-氧化石墨烯/水性聚氨酯复合涂层的抗菌性能

循环冷却水系统滋生细菌会导致生物黏泥产生及设备腐蚀，为解决这一问题，由硅烷偶联剂γ-氨丙基三乙氧基硅烷（KH550）改性纳米ZnO，改性纳米ZnO与氧化石墨烯（GO）在二甲基乙酰胺中复合，获得纳米ZnO-GO复合抗菌材料，并利用纳米ZnO-GO改性水性聚氨酯（PU），得到纳米ZnO-GO/PU复合涂层。对纳米ZnO-GO复合抗菌材料进行表征分析及抗菌性能测试，对纳米ZnO-GO/PU复合涂层进行抗菌性能测试及物理性能分析。结果表明，纳米ZnO成功负载在GO表面，纳米ZnO-GO纯度较高，当GO质量分数为35wt%、纳米ZnO-GO使用量为160 mgL^-1时，其抗菌率可达97.16%；当纳米ZnO-GO质量分数为2.33wt%时，纳米ZnO-GO/PU复合涂层抗菌率可达90.29%，同时拥有4 H的铅笔硬度及93.26%的缓蚀性能。

Antibacterial properties of nano ZnO-graphene oxide and ZnO-graphene oxide/waterborne polyurethane composite coating

Microorganism growth can result in biofouling formation and equipment corrosion. In order to solve the biofouling and corrosion problems in recirculating cooling water system, nano ZnO was modified by the silence coupling agent γ-aminopropyltriethoxysilane(KH550). The modified nano ZnO and graphene oxide(GO) were compounded in the dimethylacetamide, and the nano ZnO-GO antibacterial composites were obtained. The waterborne polyurethane(PU) was modified by nano ZnO-GO to get nano ZnO-GO/PU coating composites. The characterizations and antibacterial properties of nano ZnO-GO and the antibacterial properties and physical properties of nano ZnO-GO/PU coating composites were tested and analyzed. The results show that nano ZnO is successfully supported on the surface of GO, and the purity of nano ZnO-GO is high. When the mass fraction of GO is 35wt% and the dosage of nano ZnO-GO is 160 mgL^-1, the antibacterial rate of nano ZnO-GO is 97.16%. When the mass fraction of nano ZnO-GO is 2.33wt% in the coating, the antibacterial rate of nano ZnO-GO/PU composite coating is up to 90.29% and it has 4 H pencil hardness and 93.26% corrosion inhibition performance.