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Influence of functional group content in hydroxyl-functionalized urethane methacrylate oligomers on the crosslinking features of clearcoats

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Abstract

Crosslinking characteristics and surface mechanical properties of radical and urethane dual-curable clearcoats were investigated by changing quantities of C=C bonds and OH groups in hydroxyl-functionalized urethane methacrylate oligomer (HFUMO) resins. The isocyanate blocked with a thermal radical initiator (BL-Tri-cHD) was utilized as a hybrid dual-curable thermal crosslinker to expedite the crosslinking of the main resin. The dual reactions between various HFUMO resins and BL-Tri-cHD were efficiently monitored via Fourier transform infrared spectroscopy to measure the peaks before and after curing. The influence of each functional group (C=C bond or OH group) in HFUMO on the initiation and development of crosslinking in dual-curable clearcoats was investigated by real-time measurements using rotational rheometer and rigid body pendulum tester. Temperature-dependent mechanical properties of cured films were confirmed through dynamic mechanical analysis. The surface mechanical properties of cured clearcoat films were also evaluated via the nanoindentation and nanoscratch tests, demonstrating the variation in surface resistance with respect to the C=C bond content and the OH value. Thus, the low-temperature curing and desired mechanical properties of clearcoats can be optimized by adjusting the content of the functional groups in a HFUMO and using a dual-curable crosslinker to simultaneously generate both radical and urethane crosslinking reactions.

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Acknowledgments

This study was supported by research grants from the Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (Nos. 10067706, 20010256).

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Author notes

  1. Young-Gun June and Kevin Injoe Jung have contributed equally to this work.

Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea

    Young-Gun June, Kevin Injoe Jung, Dong Geun Lee & Hyun Wook Jung

  2. Research Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan, 44412, Republic of Korea

    Subin Jeong, Tae-Hee Lee, Young Il Park & Seung Man Noh

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  1. Young-Gun June
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Correspondence to Seung Man Noh or Hyun Wook Jung.

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June, YG., Jung, K.I., Lee, D.G. et al. Influence of functional group content in hydroxyl-functionalized urethane methacrylate oligomers on the crosslinking features of clearcoats. J Coat Technol Res 18, 229–237 (2021). https://doi.org/10.1007/s11998-020-00398-1

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  • DOI: https://doi.org/10.1007/s11998-020-00398-1

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