Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Effect of Multi-functional Group of Acrylate Crosslinker on Properties of Waterborne Polyurethane-acrylate

  • Moon, Seok Kyu (Materials & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH)) ;
  • Kim, Eun-jin (Materials & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH)) ;
  • Kwon, Yong Rok (Materials & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH)) ;
  • Kim, Jung Soo (Materials & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH)) ;
  • Kim, Hae Chan (Materials & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH)) ;
  • Park, Han Soo (School of Intergrative Engineering, Chung-Ang University) ;
  • Kim, Dong Hyun (Materials & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH))
  • Received : 2022.09.08
  • Accepted : 2022.09.27
  • Published : 2022.09.30
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Abstract

Waterborne polyurethane-acrylate(WPUA) dispersions were prepared by surfactant-free emulsion polymerization in a two-step process. In the first step, polytetrahydrofuran, isophorone diisocyanate, dimethylol proponic acid, and 2-hydroxyethyl methacrylate were used to synthesize a vinyl-terminated polyurethane prepolymer. In the second step, styrene, methyl methacrylate, butyl acrylate, and different multi-functional crosslinkers were copolymerized. 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, and pentaerythritol tetraacrylate were used as the crosslinkers, and their effect on the mechanical and thermal properties of WPUA was investigated. Overall, as the number of functional groups of the cross-linker increased, the gel fraction improved to 79.26%, the particle size increased from 75.9 nm to 148.7 nm, and the tensile strength was improved from 5.86 MPa to 12.40 MPa. In thermal properties, the glass transition temperature and decomposition temperature increased by 9.9℃ and 18℃, respectively. The chemical structures of the WPUA dispersions were characterized by Fourier-transform infrared spectroscopy. The synthesized WPUA has high potential for applications such as coatings, leather coatings, adhesives, and wood finishing.

Keywords

Acknowledgement

본 연구는 산업통상자원부의 지원을 받는 소재부품기술개발사업(20010566, 수송기기용 VOC-free 수계 투명 코팅 바니쉬 소재 및 공정기술 개발)을 통해 수행되었습니다

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