Thermal crosslinking characteristics of dual-curable isocyanate blocked with methacrylate-functionalized amine derivatives for eco-friendly automotive clearcoats

Ho Yeon Moon, Seung Man Noh, Hyun Wook Jung

Research output: Contribution to journalArticlepeer-review

Abstract

A novel isocyanate blocked with an amine derivative blocking agent (2-(tert-butylamino) ethyl methacrylate, TBEMA) was designed as a thermal crosslinker for an eco-friendly automotive clearcoat system. New dual-curable blocked isocyanate (BITBEMA) was effectively deblocked at curing temperatures of 120 and 130 °C, which are lower than the conventional curing temperature of 150 °C. The deblocking features of BITBEMA were verified through experimental measurements and density functional theory simulations. The amine-based blocking agent with the methacrylate functionality directly participated in free radical polymerization with C[dbnd]C double bonds in the main resin (hydroxyl functionalized urethane methacrylate oligomer) during thermal curing, leading to enhanced crosslinking networks as well as reduced emissions of volatile organic compounds. The real-time crosslinking behaviors and mechanical properties of the clearcoat with BITBEMA were compared to those of clearcoats with mono-curable amine-based blocked isocyanate and a commercial crosslinker, confirming the excellent crosslinking characteristics of the dual-curable isocyanate crosslinker.

Original languageEnglish
Article number155058
JournalApplied Surface Science
Volume607
DOIs
Publication statusPublished - 2023 Jan 1

Keywords

  • Amine-based blocked isocyanate
  • Dual-curing
  • Eco-friendly clearcoat
  • Methacrylate functionalization
  • Thermal crosslinking

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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