Reactivity and Curing Efficiency of Isocyanate Cross-linkers with Imidazole-Based Blocking Agents for Low-Temperature Curing of Automotive Clearcoats

For the application of low-temperature curing on automotive clearcoats, isocyanate cross-linkers blocked with imidazole derivatives were newly synthesized. The effect of the alkyl groups in the imidazole derivatives on the deblocking behavior and curing kinetics was investigated. The free isocyanate...
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Autor*in:	Moonhyun Choi [verfasserIn] Maeng Gi Kim [verfasserIn] Kevin Injoe Jung [verfasserIn] Tae Hee Lee [verfasserIn] Miran Ha [verfasserIn] Woochan Hyung [verfasserIn] Hyun Wook Jung [verfasserIn] Seung Man Noh [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Schlagwörter:	automotive clearcoat blocked isocyanates low-temperature curing imidazole blocking agent cross-linking properties urethane reaction

Übergeordnetes Werk:	In: Coatings - MDPI AG, 2012, 10(2020), 974, p 974
Übergeordnetes Werk:	volume:10 ; year:2020 ; number:974, p 974

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/coatings10100974

Katalog-ID:	DOAJ047079738

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language	English
source	In Coatings 10(2020), 974, p 974 volume:10 year:2020 number:974, p 974
sourceStr	In Coatings 10(2020), 974, p 974 volume:10 year:2020 number:974, p 974
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	automotive clearcoat blocked isocyanates low-temperature curing imidazole blocking agent cross-linking properties urethane reaction Engineering (General). Civil engineering (General)
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container_title	Coatings
authorswithroles_txt_mv	Moonhyun Choi @@aut@@ Maeng Gi Kim @@aut@@ Kevin Injoe Jung @@aut@@ Tae Hee Lee @@aut@@ Miran Ha @@aut@@ Woochan Hyung @@aut@@ Hyun Wook Jung @@aut@@ Seung Man Noh @@aut@@
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callnumber-first	T - Technology
author	Moonhyun Choi
spellingShingle	Moonhyun Choi misc TA1-2040 misc automotive clearcoat misc blocked isocyanates misc low-temperature curing misc imidazole blocking agent misc cross-linking properties misc urethane reaction misc Engineering (General). Civil engineering (General) Reactivity and Curing Efficiency of Isocyanate Cross-linkers with Imidazole-Based Blocking Agents for Low-Temperature Curing of Automotive Clearcoats
authorStr	Moonhyun Choi
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topic_title	TA1-2040 Reactivity and Curing Efficiency of Isocyanate Cross-linkers with Imidazole-Based Blocking Agents for Low-Temperature Curing of Automotive Clearcoats automotive clearcoat blocked isocyanates low-temperature curing imidazole blocking agent cross-linking properties urethane reaction
topic	misc TA1-2040 misc automotive clearcoat misc blocked isocyanates misc low-temperature curing misc imidazole blocking agent misc cross-linking properties misc urethane reaction misc Engineering (General). Civil engineering (General)
topic_unstemmed	misc TA1-2040 misc automotive clearcoat misc blocked isocyanates misc low-temperature curing misc imidazole blocking agent misc cross-linking properties misc urethane reaction misc Engineering (General). Civil engineering (General)
topic_browse	misc TA1-2040 misc automotive clearcoat misc blocked isocyanates misc low-temperature curing misc imidazole blocking agent misc cross-linking properties misc urethane reaction misc Engineering (General). Civil engineering (General)
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title	Reactivity and Curing Efficiency of Isocyanate Cross-linkers with Imidazole-Based Blocking Agents for Low-Temperature Curing of Automotive Clearcoats
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title_full	Reactivity and Curing Efficiency of Isocyanate Cross-linkers with Imidazole-Based Blocking Agents for Low-Temperature Curing of Automotive Clearcoats
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author_browse	Moonhyun Choi Maeng Gi Kim Kevin Injoe Jung Tae Hee Lee Miran Ha Woochan Hyung Hyun Wook Jung Seung Man Noh
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title_sort	reactivity and curing efficiency of isocyanate cross-linkers with imidazole-based blocking agents for low-temperature curing of automotive clearcoats
callnumber	TA1-2040
title_auth	Reactivity and Curing Efficiency of Isocyanate Cross-linkers with Imidazole-Based Blocking Agents for Low-Temperature Curing of Automotive Clearcoats
abstract	For the application of low-temperature curing on automotive clearcoats, isocyanate cross-linkers blocked with imidazole derivatives were newly synthesized. The effect of the alkyl groups in the imidazole derivatives on the deblocking behavior and curing kinetics was investigated. The free isocyanate groups exposed by the deblocking of imidazole-based blocking agents were monitored by real-time Fourier-transform infrared spectroscopy. The bond dissociation energy, activation energy of deblocking, and H–N distance were interpreted through density functional theory simulation of various imidazole-based blocked isocyanates. To evaluate their applicability to automotive clearcoats, the synthesized imidazole-based blocked isocyanates were mixed with a polyol binder containing hydroxyl groups, and the clearcoat samples were cured at relatively low curing temperatures (100, 110, and 120 °C). The real-time storage modulus was measured using a rotational rheometer to elucidate the thermal curing dynamics by the blocking agents. In addition, the surface hardness of the cured clearcoat layers, which is affected by the chemical structure of the imidazole derivatives, was evaluated by nanoindentation test. In-depth analyses of the deblocking behaviors and thermal curing properties of clearcoats using imidazole-based blocked isocyanates demonstrated that the newly developed coating system could be suitably applied for the development of low-temperature curing technology.
abstractGer	For the application of low-temperature curing on automotive clearcoats, isocyanate cross-linkers blocked with imidazole derivatives were newly synthesized. The effect of the alkyl groups in the imidazole derivatives on the deblocking behavior and curing kinetics was investigated. The free isocyanate groups exposed by the deblocking of imidazole-based blocking agents were monitored by real-time Fourier-transform infrared spectroscopy. The bond dissociation energy, activation energy of deblocking, and H–N distance were interpreted through density functional theory simulation of various imidazole-based blocked isocyanates. To evaluate their applicability to automotive clearcoats, the synthesized imidazole-based blocked isocyanates were mixed with a polyol binder containing hydroxyl groups, and the clearcoat samples were cured at relatively low curing temperatures (100, 110, and 120 °C). The real-time storage modulus was measured using a rotational rheometer to elucidate the thermal curing dynamics by the blocking agents. In addition, the surface hardness of the cured clearcoat layers, which is affected by the chemical structure of the imidazole derivatives, was evaluated by nanoindentation test. In-depth analyses of the deblocking behaviors and thermal curing properties of clearcoats using imidazole-based blocked isocyanates demonstrated that the newly developed coating system could be suitably applied for the development of low-temperature curing technology.
abstract_unstemmed	For the application of low-temperature curing on automotive clearcoats, isocyanate cross-linkers blocked with imidazole derivatives were newly synthesized. The effect of the alkyl groups in the imidazole derivatives on the deblocking behavior and curing kinetics was investigated. The free isocyanate groups exposed by the deblocking of imidazole-based blocking agents were monitored by real-time Fourier-transform infrared spectroscopy. The bond dissociation energy, activation energy of deblocking, and H–N distance were interpreted through density functional theory simulation of various imidazole-based blocked isocyanates. To evaluate their applicability to automotive clearcoats, the synthesized imidazole-based blocked isocyanates were mixed with a polyol binder containing hydroxyl groups, and the clearcoat samples were cured at relatively low curing temperatures (100, 110, and 120 °C). The real-time storage modulus was measured using a rotational rheometer to elucidate the thermal curing dynamics by the blocking agents. In addition, the surface hardness of the cured clearcoat layers, which is affected by the chemical structure of the imidazole derivatives, was evaluated by nanoindentation test. In-depth analyses of the deblocking behaviors and thermal curing properties of clearcoats using imidazole-based blocked isocyanates demonstrated that the newly developed coating system could be suitably applied for the development of low-temperature curing technology.
collection_details	GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700
container_issue	974, p 974
title_short	Reactivity and Curing Efficiency of Isocyanate Cross-linkers with Imidazole-Based Blocking Agents for Low-Temperature Curing of Automotive Clearcoats
url	https://doi.org/10.3390/coatings10100974 https://doaj.org/article/c5df92833d43401b84c8ea35f14b19d7 https://www.mdpi.com/2079-6412/10/10/974 https://doaj.org/toc/2079-6412
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author2	Maeng Gi Kim Kevin Injoe Jung Tae Hee Lee Miran Ha Woochan Hyung Hyun Wook Jung Seung Man Noh
author2Str	Maeng Gi Kim Kevin Injoe Jung Tae Hee Lee Miran Ha Woochan Hyung Hyun Wook Jung Seung Man Noh
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up_date	2024-07-03T23:57:27.063Z
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Reactivity and Curing Efficiency of Isocyanate Cross-linkers with Imidazole-Based Blocking Agents for Low-Temperature Curing of Automotive Clearcoats

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