Nano-silica-containing acrylic polyurethane and acrylic-polyester hybrid polyurethane coatings for direct-to-metal (DTM) coating applications – a comparative study

IF 2.3 4区 材料科学 Q2 Chemistry
Sukanya Gangopadhyay, Prakash A. Mahanwar
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引用次数: 0

Abstract

In the era of sustainability, direct-to-metal coatings have proven to be a promising solution as it eliminates the need for underneath primer coating layers. In the present study, two coating systems, viz. acrylic polyurethane and acrylic-polyester hybrid polyurethane nano-composite coatings, were prepared by addition of nano-silica in various loadings for direct-to-metal coating applications. The addition of nano-silica along with selected resin systems enables to meet desired mechanical properties, chemical resistance along with weathering and corrosion resistance of DTM coating system. Incredible improvement in the overall mechanical properties of the coating including pencil hardness and scratch resistance has been observed by the addition of nano-silica. SEM technique was employed to evaluate the nano-silica dispersion into the coating system along with its morphology. SEM studies revealed thorough dispersion of the nanoparticles within the coating matrix for both the coating systems. Thermal properties were studied by thermogravimetric analysis along with structural characterization by Fourier transform infrared spectroscopy. Thermal stability of both the coating systems increased with the addition of nano-silica; however, acrylic-polyester hybrid polyurethane coatings revealed better thermal stability at 8% nano-silica loading. Color and gloss changes were studied before and after 500 h exposure to a QUV chamber. Anticorrosive properties were evaluated by salt spray exposure for 700 h. At 8% nano-silica loading, acrylic-polyester hybrid polyurethane coatings revealed better weathering performance along with anticorrosive properties and chemical resistance owing to the presence of hybrid polymer chains.

含纳米硅的丙烯酸聚氨酯和丙烯酸-聚酯混合聚氨酯涂料的直接到金属(DTM)涂层应用-比较研究
在可持续发展的时代,直接接触金属涂层已被证明是一种很有前途的解决方案,因为它消除了底层底漆涂层的需要。在本研究中,通过添加不同负载的纳米二氧化硅,制备了两种涂层体系,即丙烯酸聚氨酯和丙烯酸-聚酯混合聚氨酯纳米复合涂层,用于直接涂覆金属。纳米二氧化硅的加入以及所选择的树脂体系能够满足DTM涂层体系所需的机械性能、耐化学性以及耐风化性和耐腐蚀性。通过添加纳米二氧化硅,涂层的整体机械性能得到了令人难以置信的改善,包括铅笔硬度和抗划伤性。利用扫描电镜技术对纳米二氧化硅在涂层体系中的分散及其形貌进行了表征。扫描电镜研究表明,纳米颗粒在两种涂层系统的涂层基质中完全分散。热重分析研究了材料的热性能,并用傅里叶变换红外光谱对材料进行了结构表征。纳米二氧化硅的加入提高了两种涂层体系的热稳定性;然而,丙烯酸-聚酯混合聚氨酯涂层在8%纳米二氧化硅负载下表现出更好的热稳定性。在QUV室中暴露500小时前后,研究了颜色和光泽的变化。防腐性能通过盐雾暴露700小时来评估。在8%纳米二氧化硅负载下,由于混合聚合物链的存在,丙烯酸-聚酯混合聚氨酯涂料表现出更好的耐候性能、防腐性能和耐化学性。
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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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