Marine coatings based on metal complexes of 4-amino-3-hydrazino-5-thio-1,2,4-triazole

Copper, cobalt, nickel and tin metal complexes of 4-amino-3-hydrazino-5-thio-1,2,4-triazole (I) have been prepared and their structure identified through IR and electronic spectra measurements. The cobalt and nickel have been found to be octahedral; on the other hand, a mixed structure is proposed for the copper complex. The complexes are incorporated in marine paint formulations in the presenceo of 4-(p-chlorobenzylideneamino)-3-(p-chlorobenzylidenehydrazino)-5-thio-1,2,4-triazole, 4-(3,4-dichlorobenzylideneamino)-3-(3,4-dichlorobenzyl idenehydrazino)-5-thio-1,2,4-triazole and 4-(p-nitrobenzylideneamino)-3-(p-nitrobenzylidenehydrazino)-5-thio-1,2,4-triazole. Each paint was applied to PVC and mild steel substrate and the panels were tested in Alexandria eastern harbour water. Paints containing copper, cobalt and nickel complexes of (I) in the presence of its chlorinated or nitro derivatives showed antifouling properties till about 4 months, while they protect steel substrate from marine corrosion for 1 month.     

水泥装饰板材瓷性建筑涂料研究与应用

以复合无机硅酸盐为基料,配以成膜助剂、颜填料和贮存稳定剂,开发了水泥装饰板材瓷性建筑涂料,该涂料的涂膜具有硬度高、防火性和耐水性好的特点。     

生物功能涂料的研究进展

本文综述了生物功能涂料的发展概况，并对国内外新型生物功能涂料的研究情况做了介绍，展望了生物功能涂料的发展前景。     

Exposure to Volatile Organic Compounds of Microbial Origin (MVOC) during Indoor Application of Water-based Paints

The market for water-based paints (WBP) is growing, and these paints are favoured due to their low emission of volatile organic compounds (VOC). Because of the risk for microbial growth, biocides are usually added to WBP. Our study aimed to measure exposure to VOCs potentially of microbial origin (MVOC), during indoor application of typical Scandinavian WBP. Low concentrations of three MVOCs, 3-methyl-furan, 1-octen-3-ol, and 2-octen-1-ol, were detected during 5 out of 20 painting operations (25%). Mean exposures to MVOC and TVOC were 0.15 and 5000 μg/m³, respectively. No relation between MVOC and TVOC was observed. The highest exposure to MVOC was measured from an ecological paint, claimed to be low in VOCs and chemical additives. The results suggest that microbial growth in WBP may occur, and that measurements of MVOCs could be used as a means of quality control for WBP. The use of biocides in paint should be guided by the principle of a balance between the risk of contact allergies or other possible health hazards from the biocides, and the risk of microbial growth. If microbial growth occurs in paint, it may cause both unpleasant odor and potential health hazards for house painters and dwellers.     

鲨鱼表皮微观形貌及防污性能研究

采用三维视频显微镜和环境扣描电镜(ESEM)观察了鲨鱼表皮的微观形貌,并测量了相关尺寸,同时结合贻贝和底栖硅藻附着试验对鲨鱼表皮防污性能进行了测试,初步探讨了鲨鱼表皮防污机理.     

大理石花纹漆的配方设计及施工工艺探讨

通过试验,用特殊改性丙烯酸树脂、染料、溶剂等制备大理石花纹漆,探讨了大理石花纹漆各漆层的施工工艺和配方设计,并讨论了树脂、颜料、助剂和有机溶剂等对大理石花纹漆性能和大理石效果的影响。     

变压器容量测试仪校验方法的研究

对变压器容量测试仪的校验方法进行研究,提出校验原理。采用三相标准表校验电压、电流测试误差,通过更准确的电压、电流测量,计算出模拟变压器容量,与被检变压器容量测试仪测量值比较,得出容量测试误差。     

Polypropylene composite hollow fiber ultrafiltration membranes with an acrylic hydrogel surface by in situ ultrasonic wave-assisted polymerization for dye removal

In this study, polypropylene composite hollow fiber membrane with an acrylic hydrogel layer was fabricated successfully by in situ ultrasonic wave-assisted polymerization. The ultrasonic irradiation can significantly improve the grafting efficiency of acrylic acid on the membrane surface. The modified membranes were characterized on the basis of physicochemical characteristics, permeation performance and antifouling property. The results revealed that the pure water flux of modified membranes was significantly increased when the graft density was lower than 0.82 mg cm⁻², due to the improvement of hydrophilicity. Interestingly, the optimized membrane PPM1.49 could efficiently remove organic dyes from aqueous solution, showing retentions of 99.5 and 98.7% to Congo red and methylthionine chloride, respectively. Meanwhile, its flux recovery ratio was elevated from 68.0 to 92.0% using bovine serum albumin aqueous solution as a foulant compared with the pristine membrane. These promising results indicate that modified membranes developed in this study are potentially applicable for dye removal from wastewater. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47099.     

Green and feasible fabrication of loose nanofiltration membrane with high efficiency for fractionation of dye/NaCl mixture by taking advantage of membrane fouling

Loose nanofiltration membrane emerges as required recently, since it is hard for conventional nanofiltration membrane to fractionate mixture of dyes and salts in textile wastewater treatment. However, the polymeric membranes unavoidably suffer from membrane fouling, which was caused by the adsorption of organic pollutants (like dyes). Normally, the dye fouling layer will shrink membrane pore size, thus resulting in flux decline and rejection increase. It is thought that membrane fouling may be a double-edged sword and can be an advantage if properly utilized. Thereby, loose nanofiltration membranes were constructed here by a green yet effective method to fractionate dyes/salt mixture by taking advantage of membrane fouling without using poisonous ingredients. A commercially available polyacrylonitrile (PAN) ultrafiltration membrane with high permeability was chosen as the substrate, and dyes were used to contaminate PAN substrate and formed a stable barrier layer when adsorption of dyes reached dynamic equilibrium. The resultant PAN-direct red 80 (DR80) composite membranes displayed superior permeability (~128.4 L m⁻² h⁻¹) and high rejection (~99.9%) to DR80 solutions at 0.4 MPa. Moreover, PAN-DR80 membranes allowed fast fractionation of dyes/sodium chloride (NaCl) mixture, which maintained a negligible dye loss and a low NaCl rejection (~12.4%) with high flux of 113.6 L m⁻² h⁻¹ at 0.4 MPa. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47438.