2019 Coatings Industry Issue 12 Summary (II)

Process Technology
5, Laser and Plasma Treatment Effects on Composite Surface Coating Adhesion
Abstract: In order to improve the adhesion of epoxy coatings on fiber-reinforced polypropylene composites, laser and plasma surface pre-treatment methods are used, ultra-depth-of-field microscopes, roughness The effects of laser and plasma surface treatment on fiber-reinforced polypropylene composite surface appearance, surface roughness and surface water contact angle were studied, and the effects of these two surface treatment methods on adhesion of epoxy coating on composite materials were studied. The results show that the adhesion of epoxy coating on substrate can be significantly improved by 2 treatment methods, and the adhesion can be increased from less than 1MPa to more than 8MPa.
keywords: laser treatment; plasma treatment; Composites; surface roughness; surface appearance; contact angle; adhesion; epoxy coatings
Tang Peng 1, 2, Wang Yang 1, 2, Cao Dong Ping 1,2, Gao Lixin 3, Zhou Ganhua 3, Zhu Hao 3, Liu Xiusheng x1,2 (1. Wuhan Materials Protection Research Institute Co., Ltd., Wuhan 430030; 2. Special surface protection materials National Key Laboratory of Applied Technology, Wuhan 430030; 3. Chery New Energy Vehicle Technology Co., Ltd., Wuhu, Anhui Province, 241000)
Health, Safety, Environment
6, acrylic modified trench oil-based water-based aleate anti-corrosion coating preparation
Abstract: the use of trench oil as raw material synthetic water-based aleate resin, and then the use of acrylic acid to its modified, water-based alcohol-resistant resin. The results show that the synthetic process conditions are: acid value range of 50 to 80 mg KOH/g, alcohol and acid solution temperature of 230 to 240 degrees C, the obtained paint properties are satisfied with HG/T4847-20 15 requirements, table dry time is less than 8h, dry time is less than 24h, water resistance and salt water resistance is good, volatile organic matter content (VOC) is low, only 37g/L, waste environmental protection, good application prospects.
keywords: trench oil; acrylic modified; water-based alcoholic acid resin; anti-corrosion coatings
Wang Yao 1, Deng Yuequan x1, Guo Liqin 1, Yang Wei 1, Jiang Zhengxing 1, Jia Bin 2 (1. Southwest University of Science and Technology School of Materials Science and Engineering, Sichuan Mianyang 621010; 2. Micron particle application research and technology international cooperation laboratory, Sichuan Mianyang 621010
Polyester/TGIC Powder Coating Curing Dynamics Analysis
Abstract: Analysis of the curing process of EWA1113 and PWA1221 polyester/TGIC powder coatings by Fourier Transform Infrared Spectroscopy (FT-IR), to determine whether the powder coating has a curing reaction, and to analyze the curing process of powder coatings using differential scanning thermal analysis (DSC). The results show that the theoretical curing temperature range of EWA1113 and PWA1221 powder coatings is 133.2 to 232.2 degrees C and 151.6 to 232.2 degrees C, respectively; β extraterring method determines the curing process parameters of EWA1113 powder, linear fit can obtain gelding temperature T0 is 97 degrees C, curing temperature TP is 159.6 degrees C, and post-treatment temperature Tf is 19 5.98 degrees C; the active energy of the reaction is studied by Kissinger and Doyle-Ozawa equations; the active energy Ea is 92.14kJ/mol by computational analysis; and the Crane empirical equation is used. It is calculated that the curing reaction stage n is 0.93, and through DSC analysis of the curing characteristics of the coating, the relationship between curing degree and temperature, the theoretical minimum curing time, etc., the conclusion is drawn that the slower the heating rate, the greater the curing degree of the powder coating.
key words: powder coating; curing dynamics; FT-IR; DSC
Wang Literature, Wang Yuxuan, Han Yuying, Liu Yuliang, Wang Chuanxing (Qingdao University of Science and Technology School of Chemical Engineering, Qingdao, Shandong 266042)
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