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Journal of Coatings Technology and Research

, Volume 16, Issue 2, pp 597–605 | Cite as

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

  • Zijian Li
  • Cuiping Li
  • Dongxin Li
  • Yuxiang Jiang
  • Zaifeng LiEmail author
Article
  • 91 Downloads

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.

Keywords

Organo-montmorillonite Silica hybrid polyurethane Preparation Properties Electrophoresis 

Notes

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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Copyright information

© American Coatings Association 2018

Authors and Affiliations

  1. 1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of EducationOcean University of ChinaQingdaoChina
  2. 2.State Key Laboratory Base of Eco-chemical EngineeringQingdao University of Science and TechnologyQingdaoChina

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