TY - JOUR
T1 - Thermal crosslinking characteristics of dual-curable isocyanate blocked with methacrylate-functionalized amine derivatives for eco-friendly automotive clearcoats
AU - Moon, Ho Yeon
AU - Noh, Seung Man
AU - Jung, Hyun Wook
N1 - Funding Information:
This research was supported by the Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (grant numbers 20017536 and 20010256) and the Korea Research Institute of Chemical Technology (KRICT) Research and Development (R&D, SS2241-10) program.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1/1
Y1 - 2023/1/1
N2 - 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.
AB - 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.
KW - Amine-based blocked isocyanate
KW - Dual-curing
KW - Eco-friendly clearcoat
KW - Methacrylate functionalization
KW - Thermal crosslinking
UR - http://www.scopus.com/inward/record.url?scp=85139080468&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2022.155058
DO - 10.1016/j.apsusc.2022.155058
M3 - Article
AN - SCOPUS:85139080468
SN - 0169-4332
VL - 607
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 155058
ER -