Effect of the particle sizes of silica on the properties of UV-curing matting coatings
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Effect of the particle sizes of silica on the properties of UV-curing matting coatings Ziyuan Yang, Jianbing Wu, Guozhang Ma, Caiying Hou, Yanxia Niu, Huafeng Duan, Xiaogang Hao
Ó American Coatings Association 2020 Abstract UV-curable matting composites were prepared by micron silica matting agent, polyether diol (PPG), isophorone diisocyanate (IPDI), and 2-hydroxyethyl methacrylate (HEMA) via the in situ polymerization method. The structure, surface morphology, and thermal stability of the composites were characterized by FTIR, SEM, and TGA, respectively. As the main resin in the UV-curable coating, the effects of particle sizes of silica on the gloss, abrasion resistance, adhesion, and hydrophilic properties of coatings were measured. The results show that the agglomeration phenomenon of the modified silica in the composite coating was obviously improved. The smaller the particle size, the lower the gloss of coatings with the same content. The adhesion strength and abrasion resistance of the composites were superior to those of pure UV-curing coatings without silica. The greater the particle sizes of the added modified silica, the stronger the hydrophilicity of the composite. Keywords Polyurethane acrylate, Silica matting agent, Glossiness, UV-curing, In situ method
Introduction A coating is usually considered to be a protective film on the surface of a substrate or coating film with certain functions and provides color and gloss to the Z. Yang, Y. Niu (&), H. Duan, X. Hao College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China e-mail: [email protected] J. Wu, G. Ma, C. Hou Shanxi Key Laboratory of Functional Polymers for Coatings, Shanxi Research Institute of Applied Chemistry, Taiyuan 030027, China
substrate in a harsh industrial environment.1,2 The functions of the coating are giving the material a sense of beauty, reducing the surface defects, preventing its corrosion, chemical damage, etc. With the improvement of people’s consumption level and actual aesthetic conception changes, although the high-gloss coatings have been a large proportion of the coatings market, the low-gloss coatings are in accord with contemporary aesthetic as well as functional and decorative requirements, which have received constant interest by the society. Because the low-gloss coatings can reduce glare of substrate and hide surface defects better, it also has a unique touch and natural appearance, compared with high-gloss coatings.3–5 Therefore, it was widely used in various fields, such as textiles, auto parts, furniture, and household appliances.6,7 In previous studies, the preparation process of lowgloss coatings is continuously improved. Etching or polishing the coating surface by using powdered abrasives or sandpapers for posttreatment is an original method to obtain low-gloss coatings. However, this method is expensive and time-consuming.8 Ou et al. prepared an acrylic polyurethane composite emulsion by semi-batch emulsion copolymerization method, and the glossiness of the
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