Aging behavior of three-proof polyurethane coatings under UV radiation

IF 1.1 4区工程技术 Q4 POLYMER SCIENCE

Polimery Pub Date : 2022-09-29 DOI:10.14314/polimery.2022.9.4

Jianfa Wang, Zhengzhou Gu, Jie Zhao, Susu Zhang, Peiyao Li, Chao Meng, J. Sui, Xiaoyi Zhang, Shaokai Hu, Jiaying Pan, Junyi Li

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Abstract

The influence of UV radiation on the physical and mechanical properties of polyurethane resins and three-proof polyurethane coatings was examined. Changes of mechanical properties and the gloss of resins and coatings were determined. The structure of materials was confirmed using scanning microscopy SEM and Fourier transform infrared spectroscopy FTIR; thermogravimetric TGA and DTG studies were also performed. It turned out that the gloss of finished protective coatings was worse than the gloss of individual resins, and aging significantly lowered these values (from 81.3° to 8.9° in case of resins and from 61.1° to 2.8° in case of coatings after 1200 hours of irradiation). Tensile strength of resins decreased constantly during aging while their elongation at break decreased than increased reaching minimum at exposure time of 100 hours. In case of coatings, both tensile strength and elongation at break firstly decreased than increased reaching minimum at exposure time of 800 hours; after long exposure time, more than 1200 hours, these properties decreased again.

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紫外线辐射下三防聚氨酯涂料的老化行为

研究了紫外线辐射对聚氨酯树脂和三防聚氨酯涂料物理力学性能的影响。测定了树脂和涂层的力学性能和光泽度的变化。利用扫描显微镜、扫描电镜和傅里叶变换红外光谱对材料的结构进行了确证;热重TGA和DTG研究也进行了。结果表明，成品保护涂层的光泽度比单个树脂的光泽度差，老化显著降低了这些值(树脂的光泽度从81.3°降至8.9°，涂层在辐照1200小时后从61.1°降至2.8°)。在时效过程中，树脂的抗拉强度不断下降，断裂伸长率先下降后增加，在100h时达到最小值。涂层的抗拉强度和断裂伸长率均先下降后上升，在800h时达到最小值;在长时间曝光后，超过1200小时，这些性能再次下降。

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来源期刊

Polimery Materials Science-Polymers and Plastics

CiteScore

2.90

自引率

6.20%

发文量

审稿时长

1 months

期刊介绍： The "Polimery" journal, of international circulation, is publishing peerreviewed scientific and technical research papers covering polymer science and technology in the field of polymers, rubbers, chemical fibres and paints. The range of topics covered are raw materials, polymer synthesis, processing and applications of polymers. Apart from scientific and technical research papers the monthly includes technical and commercial information such as reports from fairs and exhibitions as well as home, world and technical news. “Polimery "- an international journal covering the following topics: polymers, rubber, chemical fibres and paints. The Journal is addressed to scientists, managers and engineering staff of universities, Polish Academy of Sciences, R&D institutions, industry, specializing in polymer chemistry, physical chemistry, technology and processing. “Polimery” publishes original, reviewed research, scientific and technology papers in the field of polymer synthesis, analysis, technology and modification, processing, properties, applications and recycling.