Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Chemical Structure Effect of Diisocyanate on the Coating Performance of Polyurethane-based Gel-coats

  • Park, Jin Hwan (Department of Polymer Science & Engineering, Dankook University) ;
  • Baek, Seung-Suk (Department of Polymer Science & Engineering, Dankook University) ;
  • Kim, Oh Young (Department of Polymer Science & Engineering, Dankook University) ;
  • Hong, Seheum (Department of Polymer Science & Engineering, Dankook University) ;
  • Park, Dong Hyup (Applied Polymer Research Center, Korea Conformity Laboratory) ;
  • Hwang, Seok-Ho (Department of Polymer Science & Engineering, Dankook University)
  • Received : 2019.01.14
  • Accepted : 2019.01.24
  • Published : 2019.03.31
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Abstract

Four different diisocyanates (IPDI; isophorone diisocyanate, HDI; hexamethylene diisocyanate, HMDI; dicyclohexylmethane-4,4'-diisocyanate, and XDI; m-xylylene diisocyanate) were used to prepare polyurethane gel-coats, and the weatherabilities, physical properties, and surface characteristics of the gel-coats were investigated with respect to the chemical structure of the diisocyanates. The weathering test results indicated that all of the diisocyanates used in this study were suitable for use in the preparation of the polyurethane gel-coat. However, the set-to-touch times and physical properties of the polyurethane gel-coat indicated that the cycloaliphatic diisocyanate (IPDI and HMDI) were ideal for the preparation of polyurethane gel-coats.

Keywords

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Figure 1. The chemical structure of the diisocyanates used in this study.

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Figure 2. The set-to-touch time of the gel-coat depending on chemical structure of the diisocyanate.

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Figure 3. The surface hardness of the gel-coat depending on chemical structure of the diisocyanate.

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Figure 4. The tensile strength of the gel-coat depending on chemical structure of the diisocyanate.

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Figure 5. The pull-off test results of the gel-coat depending on chemical structure of the diisocyanate.

Table 1. Differences in color parameters of the gel-coat depending on chemical structure of the diisocyanate before and after QUV-exposure tests.

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