Performance and mechanism of laser transmission joining between glass fiber‐reinforced PA66 and PC

On account of the large compatibility difference between glass fiber‐reinforced Polyamide 66 (GFR‐PA66) and Polycarbonate (PC), it is difficult to weld them directly by laser. A new technology is introduced in this article by which the transparent PC is successfully welded with GFR‐PA66 using cold spraying in order to spray a 20 μm‐thick aluminum film on GFR‐PA66 as the absorbed layer. Tensile shear tests show the tensile strength of welded joints is highly enhanced. The influences of bubbles, glass fiber, and aluminum atoms on the performance of the joins are investigated via the optical microscope. X‐ray Photoelectron Spectrometer (XPS) is used to detect the chemical information of fracture sections on PC. In terms of the generation of bubbles, the influence of glass fiber, the distribution of aluminum atoms, and the formation of new chemical bonds, this article analyses the mechanism why the two different materials can be welded successfully. The micro‐anchor influence of glass giber in fiber‐reinforced polymers is important. The generation of new chemical bonding (Al–O–C) between aluminum and upper PC is the main reason why the joining strength is enhanced greatly. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43068.     

Multifunctional coatings created using an antimicrobial polymer as a platform for titania precipitation on cotton

Titania precipitation on cotton has been achieved using a commercially available antimicrobial polymer, Reputex 20. The cotton swatches precipitated with titania retain antimicrobial activity, and we have also shown the ability to encapsulate diisopropylfluorophosphatase (DFPase), an enzyme capable of breaking down organofluorophosphates. Cotton swatches are easily prepared and precipitation occurs at room temperature in aqueous solutions at neutral pH. Both the antimicrobial properties of Reputex 20 and the hydrolytic activity of the DFPase enzyme are retained after titania precipitation, generating a cotton material exhibiting multifunctional properties. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43199.     

工业涂料市场营销理念与策略

分析了工业涂料的市场特点,评述了传统营销和市场营销的理念差异,提出了市场营销的主要策略。     

Analysis of Fluorine Coating in Rubber ＆ Plastic Mold Surface

The article briefly introduced the influence factors of polymer product mold failure; noted that the effect of surface protecting of the mold was better than improving the surface hardness. Pointed out the release agents had a few shortcomings like single function so could not meet the development of modern industry after the release agent usage analysis. Analyzed three fluorine coatings which had obvious advantages： solvent-based, water-based and powder type. Its release mechanism was named as self- layering technology; fluorine coating not only enabled mold to have a smooth release at a complex surface, but itself had a good corrosion resistance, so the environmental protection composite coating is the future trend of industrial surface protection.     

工程机械表面涂层早期缺陷与防治措施

针对采用液体涂料进行涂装的各类工程机械,调查表面涂层常出现的早期缺陷,分析其产生的原因并提出了防治建议措施。     

Finite Element Analysis of Ceramic Coatings under Spherical Indentation with Metallic Interlayer: Part Ⅰ Uncracked Coatings

Spherical indentation of ceramic coatings with metallic interlayer was performed by means of axisymmetric finite element analysis (FEA). Two typical ceramic coatings with relatively high and low elastic modulus deposited on aluminum alloy and carbon steel were considered. Various combinations of indenter radius-coating thickness ratios and interlayer thickness-coating thickness ratios were used in the modeling. The effects of the interlayer, the coating and the substrate on the indentation behavior, such as the radial stress distribution along the coating surface as well as the coating interface, and the plastic deformation zone evolution in the substrate were investigated in connection with the above mentioned ratios. The coating cracking dominant modes were also discussed within the context of the peak tensile stresses on the coating surface and on the coating interface.     

Water absorption by lacquer coatings

The amount of water absorbed by lacquer coatings on a metallic substrate was determined on the basis of electrical measurements. The time necessary for penetration of water down to the substrate was determined which allowed the evaluation of diffusion coefficients. Capacitance measurements were also carried out. The results obtained with these two methods were consistent within the limits of experimental error. The calculations were made with the assumption that the transport of water occurs in accordance with Fick's law. The knowledge of the diffusion coefficient for water can be the basis for the comparative evaluation of varnish coating quality from the protective properties point of view.     

跨海大桥钢结构防腐涂料设计方案

介绍了跨海大桥钢结构防护涂层(包括防锈底漆、中间漆和面漆)的选择标准、原则以及主桥钢箱梁热喷涂防腐蚀涂层体系和热喷涂锌、铝涂层钢铁防护标准.通过实例说明了跨海大桥钢箱梁防腐涂料体系设计方案及其涂装注意事项.论述了钢丝主缆涂装工艺及钢质护栏内、外表面防腐涂装方案.     

水性防腐涂料贮存稳定性的研究

由于水性树脂、颜料和填料等多方面的影响,水性防腐涂料在贮存中容易分层、沉淀,在不同体系中添加不同类型的触变剂可以有效地改善产品的贮存稳定性,使之在不同的环境温度下避免分层、沉淀等问题。     

饰面型防火涂料性能实验测试及应用研究

简要论述了膨胀型饰面防火涂料的阻燃机理,通过西子PC60—3饰面型木结构防火涂料性能测试分析论述了膨胀型防火涂料的耐火性能,并对比分析了饰面型防火涂料与其他类型防火涂料在涂料性能、耐燃时间等方面的不同,分析探讨各种防火涂料的特点、性价比和使用场所的环境对其的影响。最后,对饰面型防火涂料未来的发展趋势进行了展望。