Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats

A novel blocked isocyanate crosslinker was synthesized, and its applicability was investigated for the low-temperature curing of automotive clearcoats. Various pyrazole derivatives were prepared as blocking agents in isocyanate crosslinkers, which strongly affect the deblocking and curing properties...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Young-Gun June [verfasserIn] Kevin Injoe Jung [verfasserIn] Moonhyun Choi [verfasserIn] Tae Hee Lee [verfasserIn] Seung Man Noh [verfasserIn] Hyun Wook Jung [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Schlagwörter:	low-temperature curing automotive clearcoat blocked isocyanates pyrazole blocking agents urethane reaction crosslinking dynamics

Übergeordnetes Werk:	In: Coatings - MDPI AG, 2012, 10(2020), 961, p 961
Übergeordnetes Werk:	volume:10 ; year:2020 ; number:961, p 961

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/coatings10100961

Katalog-ID:	DOAJ059622180

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520			\|a A novel blocked isocyanate crosslinker was synthesized, and its applicability was investigated for the low-temperature curing of automotive clearcoats. Various pyrazole derivatives were prepared as blocking agents in isocyanate crosslinkers, which strongly affect the deblocking and curing properties of the urethane-bonded coating systems. The thermal curing properties of clearcoat samples containing a pyrazole-based blocked isocyanate crosslinker and polyol resin were characterized under two different temperature conditions (120 and 150 °C). The decrease in the amount of hydroxyl groups in the polyol before and after curing was expressed by the change in OH stretching frequency in the Fourier transform infrared (FT-IR) spectra. The real-time rheological storage moduli of the bulk clearcoat mixtures were measured via a rotational rheometer to determine the effect of pyrazole-based blocking agents on the curing dynamics. In addition, a rigid-body pendulum tester (RPT) was employed to investigate the curing behavior in the thin film form. The nano-indentation and the nano-scratch tests were conducted to examine the surface hardness and scratch resistance characteristics of the cured clearcoat films. The results show that a low-temperature curing system of clearcoats can be realized by tuning the curing temperature and reactivity of isocyanate crosslinkers blocked with pyrazole-based substituents.
650		4	\|a low-temperature curing
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allfields	10.3390/coatings10100961 doi (DE-627)DOAJ059622180 (DE-599)DOAJ568b1f5e55b04189b0ffd0251e9ed0e7 DE-627 ger DE-627 rakwb eng TA1-2040 Young-Gun June verfasserin aut Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A novel blocked isocyanate crosslinker was synthesized, and its applicability was investigated for the low-temperature curing of automotive clearcoats. Various pyrazole derivatives were prepared as blocking agents in isocyanate crosslinkers, which strongly affect the deblocking and curing properties of the urethane-bonded coating systems. The thermal curing properties of clearcoat samples containing a pyrazole-based blocked isocyanate crosslinker and polyol resin were characterized under two different temperature conditions (120 and 150 °C). The decrease in the amount of hydroxyl groups in the polyol before and after curing was expressed by the change in OH stretching frequency in the Fourier transform infrared (FT-IR) spectra. The real-time rheological storage moduli of the bulk clearcoat mixtures were measured via a rotational rheometer to determine the effect of pyrazole-based blocking agents on the curing dynamics. In addition, a rigid-body pendulum tester (RPT) was employed to investigate the curing behavior in the thin film form. The nano-indentation and the nano-scratch tests were conducted to examine the surface hardness and scratch resistance characteristics of the cured clearcoat films. The results show that a low-temperature curing system of clearcoats can be realized by tuning the curing temperature and reactivity of isocyanate crosslinkers blocked with pyrazole-based substituents. low-temperature curing automotive clearcoat blocked isocyanates pyrazole blocking agents urethane reaction crosslinking dynamics Engineering (General). Civil engineering (General) Kevin Injoe Jung verfasserin aut Moonhyun Choi verfasserin aut Tae Hee Lee verfasserin aut Seung Man Noh verfasserin aut Hyun Wook Jung verfasserin aut In Coatings MDPI AG, 2012 10(2020), 961, p 961 (DE-627)718627636 (DE-600)2662314-6 20796412 nnns volume:10 year:2020 number:961, p 961 https://doi.org/10.3390/coatings10100961 kostenfrei https://doaj.org/article/568b1f5e55b04189b0ffd0251e9ed0e7 kostenfrei https://www.mdpi.com/2079-6412/10/10/961 kostenfrei https://doaj.org/toc/2079-6412 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ 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 AR 10 2020 961, p 961
spelling	10.3390/coatings10100961 doi (DE-627)DOAJ059622180 (DE-599)DOAJ568b1f5e55b04189b0ffd0251e9ed0e7 DE-627 ger DE-627 rakwb eng TA1-2040 Young-Gun June verfasserin aut Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A novel blocked isocyanate crosslinker was synthesized, and its applicability was investigated for the low-temperature curing of automotive clearcoats. Various pyrazole derivatives were prepared as blocking agents in isocyanate crosslinkers, which strongly affect the deblocking and curing properties of the urethane-bonded coating systems. The thermal curing properties of clearcoat samples containing a pyrazole-based blocked isocyanate crosslinker and polyol resin were characterized under two different temperature conditions (120 and 150 °C). The decrease in the amount of hydroxyl groups in the polyol before and after curing was expressed by the change in OH stretching frequency in the Fourier transform infrared (FT-IR) spectra. The real-time rheological storage moduli of the bulk clearcoat mixtures were measured via a rotational rheometer to determine the effect of pyrazole-based blocking agents on the curing dynamics. In addition, a rigid-body pendulum tester (RPT) was employed to investigate the curing behavior in the thin film form. The nano-indentation and the nano-scratch tests were conducted to examine the surface hardness and scratch resistance characteristics of the cured clearcoat films. The results show that a low-temperature curing system of clearcoats can be realized by tuning the curing temperature and reactivity of isocyanate crosslinkers blocked with pyrazole-based substituents. low-temperature curing automotive clearcoat blocked isocyanates pyrazole blocking agents urethane reaction crosslinking dynamics Engineering (General). Civil engineering (General) Kevin Injoe Jung verfasserin aut Moonhyun Choi verfasserin aut Tae Hee Lee verfasserin aut Seung Man Noh verfasserin aut Hyun Wook Jung verfasserin aut In Coatings MDPI AG, 2012 10(2020), 961, p 961 (DE-627)718627636 (DE-600)2662314-6 20796412 nnns volume:10 year:2020 number:961, p 961 https://doi.org/10.3390/coatings10100961 kostenfrei https://doaj.org/article/568b1f5e55b04189b0ffd0251e9ed0e7 kostenfrei https://www.mdpi.com/2079-6412/10/10/961 kostenfrei https://doaj.org/toc/2079-6412 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ 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 AR 10 2020 961, p 961
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source	In Coatings 10(2020), 961, p 961 volume:10 year:2020 number:961, p 961
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topic_facet	low-temperature curing automotive clearcoat blocked isocyanates pyrazole blocking agents urethane reaction crosslinking dynamics Engineering (General). Civil engineering (General)
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container_title	Coatings
authorswithroles_txt_mv	Young-Gun June @@aut@@ Kevin Injoe Jung @@aut@@ Moonhyun Choi @@aut@@ Tae Hee Lee @@aut@@ Seung Man Noh @@aut@@ Hyun Wook Jung @@aut@@
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callnumber-first	T - Technology
author	Young-Gun June
spellingShingle	Young-Gun June misc TA1-2040 misc low-temperature curing misc automotive clearcoat misc blocked isocyanates misc pyrazole blocking agents misc urethane reaction misc crosslinking dynamics misc Engineering (General). Civil engineering (General) Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats
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topic_title	TA1-2040 Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats low-temperature curing automotive clearcoat blocked isocyanates pyrazole blocking agents urethane reaction crosslinking dynamics
topic	misc TA1-2040 misc low-temperature curing misc automotive clearcoat misc blocked isocyanates misc pyrazole blocking agents misc urethane reaction misc crosslinking dynamics misc Engineering (General). Civil engineering (General)
topic_unstemmed	misc TA1-2040 misc low-temperature curing misc automotive clearcoat misc blocked isocyanates misc pyrazole blocking agents misc urethane reaction misc crosslinking dynamics misc Engineering (General). Civil engineering (General)
topic_browse	misc TA1-2040 misc low-temperature curing misc automotive clearcoat misc blocked isocyanates misc pyrazole blocking agents misc urethane reaction misc crosslinking dynamics misc Engineering (General). Civil engineering (General)
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title	Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats
ctrlnum	(DE-627)DOAJ059622180 (DE-599)DOAJ568b1f5e55b04189b0ffd0251e9ed0e7
title_full	Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats
author_sort	Young-Gun June
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author_browse	Young-Gun June Kevin Injoe Jung Moonhyun Choi Tae Hee Lee Seung Man Noh Hyun Wook Jung
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author-letter	Young-Gun June
doi_str_mv	10.3390/coatings10100961
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title_sort	effect of urethane crosslinking by blocked isocyanates with pyrazole-based blocking agents on rheological and mechanical performance of clearcoats
callnumber	TA1-2040
title_auth	Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats
abstract	A novel blocked isocyanate crosslinker was synthesized, and its applicability was investigated for the low-temperature curing of automotive clearcoats. Various pyrazole derivatives were prepared as blocking agents in isocyanate crosslinkers, which strongly affect the deblocking and curing properties of the urethane-bonded coating systems. The thermal curing properties of clearcoat samples containing a pyrazole-based blocked isocyanate crosslinker and polyol resin were characterized under two different temperature conditions (120 and 150 °C). The decrease in the amount of hydroxyl groups in the polyol before and after curing was expressed by the change in OH stretching frequency in the Fourier transform infrared (FT-IR) spectra. The real-time rheological storage moduli of the bulk clearcoat mixtures were measured via a rotational rheometer to determine the effect of pyrazole-based blocking agents on the curing dynamics. In addition, a rigid-body pendulum tester (RPT) was employed to investigate the curing behavior in the thin film form. The nano-indentation and the nano-scratch tests were conducted to examine the surface hardness and scratch resistance characteristics of the cured clearcoat films. The results show that a low-temperature curing system of clearcoats can be realized by tuning the curing temperature and reactivity of isocyanate crosslinkers blocked with pyrazole-based substituents.
abstractGer	A novel blocked isocyanate crosslinker was synthesized, and its applicability was investigated for the low-temperature curing of automotive clearcoats. Various pyrazole derivatives were prepared as blocking agents in isocyanate crosslinkers, which strongly affect the deblocking and curing properties of the urethane-bonded coating systems. The thermal curing properties of clearcoat samples containing a pyrazole-based blocked isocyanate crosslinker and polyol resin were characterized under two different temperature conditions (120 and 150 °C). The decrease in the amount of hydroxyl groups in the polyol before and after curing was expressed by the change in OH stretching frequency in the Fourier transform infrared (FT-IR) spectra. The real-time rheological storage moduli of the bulk clearcoat mixtures were measured via a rotational rheometer to determine the effect of pyrazole-based blocking agents on the curing dynamics. In addition, a rigid-body pendulum tester (RPT) was employed to investigate the curing behavior in the thin film form. The nano-indentation and the nano-scratch tests were conducted to examine the surface hardness and scratch resistance characteristics of the cured clearcoat films. The results show that a low-temperature curing system of clearcoats can be realized by tuning the curing temperature and reactivity of isocyanate crosslinkers blocked with pyrazole-based substituents.
abstract_unstemmed	A novel blocked isocyanate crosslinker was synthesized, and its applicability was investigated for the low-temperature curing of automotive clearcoats. Various pyrazole derivatives were prepared as blocking agents in isocyanate crosslinkers, which strongly affect the deblocking and curing properties of the urethane-bonded coating systems. The thermal curing properties of clearcoat samples containing a pyrazole-based blocked isocyanate crosslinker and polyol resin were characterized under two different temperature conditions (120 and 150 °C). The decrease in the amount of hydroxyl groups in the polyol before and after curing was expressed by the change in OH stretching frequency in the Fourier transform infrared (FT-IR) spectra. The real-time rheological storage moduli of the bulk clearcoat mixtures were measured via a rotational rheometer to determine the effect of pyrazole-based blocking agents on the curing dynamics. In addition, a rigid-body pendulum tester (RPT) was employed to investigate the curing behavior in the thin film form. The nano-indentation and the nano-scratch tests were conducted to examine the surface hardness and scratch resistance characteristics of the cured clearcoat films. The results show that a low-temperature curing system of clearcoats can be realized by tuning the curing temperature and reactivity of isocyanate crosslinkers blocked with pyrazole-based substituents.
collection_details	GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ 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	961, p 961
title_short	Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats
url	https://doi.org/10.3390/coatings10100961 https://doaj.org/article/568b1f5e55b04189b0ffd0251e9ed0e7 https://www.mdpi.com/2079-6412/10/10/961 https://doaj.org/toc/2079-6412
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author2	Kevin Injoe Jung Moonhyun Choi Tae Hee Lee Seung Man Noh Hyun Wook Jung
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up_date	2024-07-04T00:15:05.862Z
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Effect of Urethane Crosslinking by Blocked Isocyanates with Pyrazole-Based Blocking Agents on Rheological and Mechanical Performance of Clearcoats

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