Wear-resistant/antifouling integrated coating protection technology of polyethylene cable

Polymer cables are being applied increasingly in fields such as deep-sea mooring and cage culture. How to improve their wear resistance and prevent microbial adhesion is an urgent problem to be solved. In this work, the surface of the cable was treated by the polyvinylpyrrolidone cross-linking method and the anchoring effect of one-dimensional linear nanomaterials, which improved the adhesion of the water-based coating. Meanwhile, the protective effect of the coating was improved through the addition of antifouling agents and wear-resistant agents. The microstructure and intermolecular forces of the coating were characterized by scanning electron microscopy and infrared spectroscopy. The net hanging test results show that the surface-treated cable exhibits better abrasion resistance and antifouling effects, and the shedding phenomenon is significantly improved.     

基于壳聚糖的防污涂膜制备及性能评估

在最佳成膜条件下,用流延法制备6种壳聚糖膜。比较了6种膜的物理特性、抑菌效果及对低浓度铜离子的吸附性能。结果表明,6种膜均具有良好的吸水性和透气性,加入交联剂戊二醛会改变膜的柔韧性,加入纳米TiO2的膜透光率降低。6种膜都具有一定的抑菌效果,而且吸附铜离子后抑菌效果有所增强。6种壳聚糖膜对铜离子的吸附具有快速高效的特点,为基于壳聚糖的自抛光、低表面能新型海洋防污损涂膜的研发提供了依据。     

Enhanced the antifouling and antibacterial performance of PVC/ZnO-CMC nanoparticles ultrafiltration membrane

Inorganic nanoparticles (NPs) have been employed in modification for polyvinyl chloride (PVC) membrane intrinsic hydrophobicity. Carboxymethyl chitosan (CMC), a natural organic matter, was used to relieve the agglomeration of zinc oxide (ZnO) NPs in the membrane matrix. In this paper, ZnO-CMC NPs were successfully prepared via co-precipitation approach, blended with PVC membranes, and the effect of ZnO-CMC NPs for the membrane properties was studied. The SEM and EDX confirmed excellent dispersion of ZnO-CMC NPs on the membrane surface. The enhanced hydrophilicity, porosity and inter-connected finger-like strcture of modified membranes confirmed by water contact angle and SEM. In addition, pure water flux of PVC/ZnO-CMC composite membrane was 107.36 L m⁻² h⁻¹ (PVC/ZnO-CMC (0.25 wt%)), which was higher than that of neat PVC membrane (83.11 L m⁻² h⁻¹). Importantly, the modified membranes exhibits lower static BSA adsorbtion because of the improved hydrophilicity, and a higher flux recovery rate (>90%) after three sequential filtration cycles. The antibacterial behavior of PVC/ZnO-CMC membrane was tested simply using Escherichia coli, and the results indicated that all composite membranes possess excellent antibacterial properties. Our work presents PVC/ZnO-CMC NPs composite membrane a promising future in wastewater treatment and antibacterial application.     

Nacre-Inspired Metal-Organic Framework Coatings Reinforced by Multiscale Hierarchical Cross-linking for Integrated Antifouling and Anti-Microbial Corrosion

A long-standing quest in marine materials science has been the development of tough and effective antifouling coatings for diverse surface protection. However, most commercial coatings are severely limited by poor mechanical behavior and unsustainable passive biocidal effect, leading to irreversible marine biofouling and even microbiologically influenced corrosion (MIC). Herein, inspired by the amorphous/crystalline feature within nacreous platelets, a mechanically robust antifouling coating composed of biopolymer-based hydrogel and dense metal-organic frameworks (MOFs) is developed. Tailoring the cross-linked networks across multiscale interfaces can furnish strength, dissipate strain, and improve toughness of the building blocks, resulting in a firm and scalable configuration on various substrates regardless of material category and surface topology. The resultant coating as a suitable reservoir exhibits a unique active defensive behavior of intelligent MOF degradation or drug release, enabling a groundbreaking performance for broad-spectrum biofouling and corrosion control. Notably, neither attachment of marine organisms nor MIC of metal substrates is observed and aggravated during the prolonged testing process in complex biological environments. This study provides distinctive insights into the underlying multimechanisms of comprehensive anti-fouling-corrosion and pioneer a rational strategy to design next-generation reliable MOFs-derived coatings in marine environments.     

氟硅耐候自清洁涂层的制备及在高铁动车组上应用

利用甲基丙烯酸甲酯（MMA）、甲基丙烯酸羟乙酯（HEMA）、甲基丙烯酸硬脂酸酯（SMA）、3-(丙烯酰氧基)丙基三异丙氧基硅烷（AC-76）和2-(全氟辛基)乙基甲基丙烯酸酯（FOEMA）合成一系列不同单体比例的聚合物（P1~P5），并用于构建耐候自清洁涂层。利用FTIR、1HNMR对聚合物结构进行表征，采用紫外-可见分光光度计及接触角测量仪测试了FOEMA和SMA质量分数涂层的透光率及疏水性的影响，当SMA质量分数为10%，FOEMA质量分数为15%（以反应体系总质量计，下同）时制备的涂层P3具有最大的透光率和水接触角，分别为98.6%和105.3°；人工加速老化实验结果表明，涂层P3具有极佳的耐候性，加速老化5000 h后，涂层的保光率及疏水性变化很小；液滴滑落及涂鸦实验结果表明，涂层P3具有优异的抗污及自清洁效果；摩擦实验结果表明，涂层P3在900 g压力下摩擦100次后其接触角仍大于95°，说明其具有优异的机械稳定性。最后，将该涂层喷涂到高铁动车组上，该涂层对动车组外车身实际污染物具有明显的自清洁效果。