水性聚氨酯涂料的研究进展

本综述了水性聚氨酯在涂料行业中的应用,介绍了水性聚氨酯木器涂料、织物涂料、防水涂料、防腐涂料、汽车涂料、功能性聚氨酯涂料的研究进展。     

聚焦功能性水性聚氨酯涂料的应用与发展

为了满足人们在生产和生活方面对具有新型功能的水性涂料的需求,近年来,绿色环保政策的推进以及人们环保观念的提高,使得水性聚氨酯涂料研究已成为行业热议话题,许多行业人士对此进行了深入研究。功能性水性聚氨酯涂料由于以水为分散介质并加入了各种功能性添加剂其成膜机理比溶剂型涂料更加复杂,需要进一步的加强研究,以便为产品的生产提供理论支持。人们通过对水性聚氨酯改性或添加助剂开发出了许多具有特殊物理和化学性质的水性聚氨酯     

高弹性水性聚氨酯橡胶涂料的研制

以水性丙烯酸改性聚氨酯(PUA)乳液为基料,加入功能性颜填料和助剂,制备出一种高弹性水性聚氨酯橡胶涂料。对高弹性水性聚氨酯涂料与传统橡胶涂料进行了一系列模拟涂覆橡胶管的对比试验,结果表明:高弹性水性聚氨酯涂料可以很好地满足工艺要求。     

水性聚氨酯涂料应用于金属防腐的技术进展

依据水性聚氨酯合成和成膜的基本原理,将水性聚氨酯涂料分为单组分、双组分和改性聚氨酯涂料,从树脂合成、涂料制备、性能特点以及涂料应用等方面进行分析和总结,展望了水性聚氨酯涂料在防腐领域的发展。     

功能型水性聚氨酯涂料的设计与应用最新进展

水性聚氨酯由于分子中引入了亲水基团,使其在耐水性、耐溶剂性、耐候性、干燥速度等方面表现欠佳,需要不断对其进行改性研究,如有机硅氟改性、环氧改性、纳米复合等。综述了近几年水性聚氨酯涂料的功能化设计、合成技术与应用进展,主要包括具有阻燃、防腐蚀、防霉杀菌、防涂鸦、透明隔热等特殊性能的功能型水性聚氨酯涂料的设计方法及应用实例。并对功能型水性聚氨酯涂料的未来发展前景作了展望,指出了功能性水性聚氨酯涂料的功能化设计方向。     

水性聚氨酯涂料新进展

综述了单组分水性聚氨酯涂料、双组分水性聚氨酯涂料和水性改性聚氨酯材料的特点及其新进展。     

水性聚氨酯功能涂料研究进展

介绍了功能性无机纳米材料ATO、ITO、Al2O3、SiO2、氧化铁和水滑石在水性聚氨酯涂料中的应用;并报导了水性聚氨酯在防腐、阻燃、防锈和导电等特殊功能涂料以及汽车涂料和外墙涂料中的应用.     

水性聚氨酯涂料发展迅速市场前景乐观

水性聚氨酯是一种环境友好型高分子材料。根据水性聚氨酯涂料将成为未来涂料产业的发展趋势,论述了水性聚氨酯广阔的市场空间,介绍了水性聚氨酯涂料的性能特点和主要应用领域,研究了水性聚氨酯木器漆常用的交联方法;并指出了水性聚氨酯木器漆的发展方向。     

绿色环保涂料的发展方向

指出绿色环保涂料的发展方向是水性化、高固体份化和粉末涂料,介绍了水性涂料、粉末涂料和高固体份涂料等三种绿色环保涂料的特点、制备方法和应用,重点介绍了水性环氧树脂涂料、水性聚氨酯涂料、水性光固化涂料。     

水性防腐蚀涂料的研究现状与展望

环境友好型水性无毒防腐蚀涂料是当今防腐蚀涂料发展的主要方向。总结了水性丙烯酸涂料、水性环氧涂料、水性无机富锌涂料和水性聚氨酯涂料的特点与最新研究动向,并提出了水性防腐蚀涂料目前存在的问题及今后的技术动向。     

生物3D打印蓖麻油基水性聚氨酯涂层固定化碳酸酐酶

以蓖麻油基阴离子水性聚氨酯为载体,采用生物3D打印技术制备含碳酸酐酶的生物活性聚氨酯涂层,并与传统涂覆法制备的含酶涂层进行对比。通过动态光散射、红外、扫描电镜-X射线能谱、热重、接触角等各种手段对涂层中酶与水性聚氨酯之间的相互作用进行了分析表征。结果表明,在形成生物活性涂层过程中,碳酸酐酶是通过与聚氨酯链段上阴离子基团的静电吸引被固定在聚氨酯涂层中。催化活性结果表明,与传统涂覆法相比,涂层的酶活回收率为50.51%,比传统涂覆法提高了4倍。这可能是由于生物3D打印技术制备的含酶涂层更薄、更均匀,表面更平滑。     

Effects of nanoparticulate silver on the corrosion protection performance of polyurethane coatings on mild steel in sodium chloride solution

Waterborne polyurethane (WPU) and high solid polyurethane (HPU) coatings containing nanoparticulate silver were coated on mild steel and compared to the corresponding coatings without nanoparticulate silver in NaCl solution using electrochemical impedance spectroscopy (EIS). The EIS results showed WPU coating degradation in the presence of nanoparticulate silver, while inclusion of nanoparticulate silver in HPU coating revealed no significant effect on the coating resistance. The WPU and HPU coatings morphology was investigated by SEM cross-section, which showed loss of WPU coating integrity in the presence of nanoparticulate silver, while no significant effect was observed for the HPU coating. The dual behavior of nanoparticulate silver in WPU and HPU coatings was connected to their different chemical structures confirmed by FTIR spectroscopy.     

国内外涂料工业现状及发展趋势(二)--中国涂料工业现状及发展思路

分析了中国涂料工业的发展现状以及面临的挑战。对我国各种功能型涂料———防火涂料、地坪涂料、氟碳涂料、纳米复合涂料、伪装涂料、船舶防污涂料、重防腐涂料、卷材涂料、水性聚氨酯涂料和隔热涂料等的研究现状进行了概述。提出了中国涂料工业的发展思路。     

建筑用水性聚氨酯涂料的研究进展

综述了建筑用水性聚氨酯(WPU)涂料的改性技术的研究进展,其改性技术包括交联改性、丙烯酸酯改性、环氧树脂改性、植物油改性和纳米材料改性等,并对建筑用WPU涂料的发展前景作了展望。     

Preparation and characterization of modified castor oil via photo-click chemistry for UV-curable waterborne polyurethane with enhanced water resistance and low conductive percolation threshold

A castor oil (CO) was modified via thiol-ene click chemistry reaction between CO and 3-mercaptopropyl trimethoxysilane, with the conversion of CC bonds of CO over 99% based on ¹HNMR spectra. The obtained modified castor oil (MCO) was used as a biobased polyol to prepare waterborne polyurethane (WPU) dispersions. The modification of CO exhibited a great effect on the properties of WPU dispersions and coatings, and an obvious change is the improvement of the water resistance of WPU coatings. WPU dispersions with MCO had good storage stability. A WPU coating with 7% MCO had high surface hydrophobicity, and its water absorption was as low as 3.2%. Conductive carbon black filled WPU coatings with MCO were cured by efficient UV radiation, and their conductive percolation threshold could decrease to 0.76%, which could be attributed to the well filler dispersion and strong filler-polymer interaction. The WPU dispersions are ecofriendly, and can be used to produce biobased WPU coatings with a great application potential in antistatic coating fields.     

汽车工业中的聚氨酯涂料

聚氨酯涂料作为重要涂料品种,在涂料市场占据较大份额。因其涂膜具有良好的耐磨性、耐腐蚀性、耐化学品性、硬度大、高弹性等优点,在汽车涂料领域也具有广泛应用及良好的发展前景。本文针对聚氨酯涂料在汽车工业中的应用作一简要叙述。     

Self-healing waterborne polyurethane coating by pH-dependent triggered-release mechanism

In this study, effect of high-loaded silica capsules with corrosion inhibitor on thermal degradation and self-healing properties of waterborne polyurethane (WPU) was investigated. Silica capsules were synthesized using an oil in water (O/W) microemulsion and WPU was prepared via the prepolymer method. Assembled capsules demonstrated pH dependent release of their core. Incorporating silica capsule as an inorganic component resulted to improve thermal and barrier properties of WPU coatings. WPU coating with 1% silica capsules demonstrated better barrier quality in corrosive media and adding more than that resulted a rapid deterioration in barrier properties. Furthermore, such coatings possess an excellent adhesive strength with steel substrate. Electrochemical impedance spectroscopy was used in corrosion monitoring and healing procedure. Moreover, capsule morphology and thermal degradation of the WPU coating has been investigated separately by scanning electron microscopy and thermal gravimetric analysis. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47082.     

Facile preparation and characterization of low-gloss waterborne polyurethane coatings using amine-based chain extenders

A novel waterborne polyurethane (WPU) coating with a self-roughed surface is prepared using a general prepolymer emulsion polymerization method. A rough surface is formed by crosslinking the WPU particles through the introduction of a polyfunctional amine-based chain extender. Ethylenediamine, diethylenetriamine (DETA) and triethylenetetramine (TETA) with different functional groups are used as chain extenders, and their effect on the surface morphology and gloss of WPU films is investigated. DETA and TETA form a rough surface on the WPU film by crosslinking the polymer chains and promoting phase separation between soft and hard segments. A rough surface reflects light diffusely, resulting in a decrease in the gloss of the film. Overall, the chain extension improves the thermal stability and tensile strength of the WPU film. In particular, the WPU film with DETA, exhibiting the highest chain extension effect, shows the lowest gloss value, the highest tensile strength and thermal stability. The present series of WPU materials, prepared without matting agents and special treatment processes, can be an effective alternative for producing low-gloss coatings. © 2022 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.     

Polydopamine functional reduced graphene oxide for enhanced mechanical and electrical properties of waterborne polyurethane nanocomposites

Waterborne polyurethane/polydopamine (PDA) functional reduced graphene oxide (WPU/PDRGO) nanocomposites were prepared by in situ emulsification method. The presence of a PDA layer and the partial reduction of GO by PDA were confirmed by FTIR, XRD, Raman spectra, and TGA. It was found that the interfacial PDA layers facilitated the dispersion of the PDRGO sheets in the WPU matrix and enhanced mechanical properties of the WPU matrix. The resulting WPU/PDRGO nanocomposite coatings show excellent electrical conductivity (9.9?×?10^?6–1.1?×?10^?4 S cm^?1) corresponding to a PDRGO content of 1–16 wt%. The obtained waterborne polyurethane/graphene nanocomposite dispersions are promising for anticorrosion, antistatic, conductive, and electromagnetic interference shielding coatings.