Relationship between curing characteristics and rheological/mechanical properties of soft-feel coatings for automotive plastic parts

Sung Ho Yoon, Dong Geun Lee, Na Hee Kim, Kevin Injoe Jung, Choon Soo Lee, Ji Won Lee, Gil Sun Lee, Hyun Wook Jung

Research output: Contribution to journalArticle


In order to investigate the properties of soft-feel coating paints for automotive interior plastics, the characteristics of coating systems were systematically determined by changing the main resin composition, isocyanate type cross-linker ratio, and curing temperature conditions. During the thermal curing process, the change in cross-linked network structure of coating systems was analyzed from the rheological properties using a rotational rheometer and curing behaviors of thin coating films were scrutinized by a rigid-body pendulum tester. After finalizing the curing process, the change in the amount of functional groups, according to the ratio (NCO/OH ratio) between main resin and crosslinker, was checked by Fourier transform infrared spectroscopy (FTIR). Also, thermal and mechanical properties of cured films were measured via dynamic mechanical analysis and nano-indentation test. Through these analyses, the relationship between curing characteristics of soft-feel paints during the curing process and various properties of final cured coating films was elucidated.

Original languageEnglish
Pages (from-to)303-310
Number of pages8
JournalPolymer (Korea)
Issue number2
Publication statusPublished - 2018 Mar 1



  • Crosslinker ratio
  • Nano-indentation test
  • Real-time rheological properties
  • Soft-feel coatings
  • Thermal curing

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

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