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Preparation of novel organo-montmorillonite and its influence on the acid resistance of hybrid cathodic electrodeposition polyurethane coating

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Abstract

Based on the super-composite effect of clay minerals consisting of silicate layers on the polymer, nano-hybrid organic–inorganic composites have attracted great interest. In this paper, a novel organoclay with reactive hydroxyl group was prepared by incorporation into a hydroxyl-terminated cationic polyurethane oligomer (HTCPU) via interlamination. Sodium montmorillonite was organically modified with HTCPU oligomers in the water medium. The modified organo-montmorillonite was characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction, and thermogravimetric analysis. After sequential poly-addition reactions, the hydroxyl-terminated polyurethane hybrid resins with nano-silica layers were prepared and then the resin mixed with blocked hexamethylene diisocyanate trimer (crosslinking agent) in advance and then was emulsified with deionized water to produce the nano-hybrid electrophoresis coating. A series of PU films were prepared by the electrophoresis process. The optimized baking temperature was determined by in situ FTIR, and the effect of the organo-montmorillonite content on the acid resistance of film was studied. When the mass fraction of organo-montmorillonite was about 0.35%, the PU film showed the best acid resistance. It was found that the desirable appearance and properties could be obtained by a prebake of a temperature of 80°C to remove water in the wet film to avoid the pinholes in the paint film for 20 min, followed by a baking temperature of 135°C for 60 min.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (No. 21676150, 21176126) and Shandong Key Research and Development Project (2018GGX102018).

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Authors and Affiliations

  1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong, China

    Zijian Li & Cuiping Li

  2. State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, Shandong, China

    Zijian Li, Dongxin Li, Yuxiang Jiang & Zaifeng Li

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  1. Zijian Li
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Correspondence to Zaifeng Li.

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Li, Z., Li, C., Li, D. et al. Preparation of novel organo-montmorillonite and its influence on the acid resistance of hybrid cathodic electrodeposition polyurethane coating. J Coat Technol Res 16, 597–605 (2019). https://doi.org/10.1007/s11998-018-0141-9

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