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Investigating the correlation between the curing behavior and properties of acrylic powder coatings

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Abstract

Acrylic powder coatings are environmentally friendly, solvent-free solid coatings with excellent durability and corrosion resistance that protect substrates from corrosive environments. The curing behavior of acrylic powder coatings affects the coating film properties. In this study, a catalyst was used to control the curing conversion rate, and the curing characteristics and physical properties were compared for coatings with and without the catalyst. Differential scanning calorimetry and an isoconversional method were used to obtain activation energies, and the conversion rate under different isothermal conditions was computed. Notably, complete curing could not be achieved without the catalyst; however, the catalyst-containing coating was entirely cured. With sufficient curing established, the addition of the catalyst was found to increase the adhesion, impact resistance, and corrosion resistance. However, the recoatability was reduced owing to a lack of unreacted monomers on the surface of the catalyst-containing coating film, as verified by Fourier-transform infrared spectroscopy. In general, the addition of a catalyst to acrylic powder coatings enabled complete curing and enhanced most physical properties, offering an improved formulation for applications across high-corrosion environments.

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Authors and Affiliations

  1. KCC Central Research Institute, 17-3, Mabuk-ro 240beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Republic of Korea

    Da Eun Lee, Jae Jun Lee, Han-Jung Cho & Jin Seok Lee

  2. School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, Republic of Korea

    Da Eun Lee

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  1. Da Eun Lee
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Appendix

Appendix

The results of each property test are presented below as separate appendices, with images (a) to (h) in each referring to different specimens as follows:

  1. (a)

    STD (165°C)

  2. (b)

    STD (175°C)

  3. (c)

    STD (185°C)

  4. (d)

    STD (195°C)

  5. (e)

    TPP-Br (165°C)

  6. (f)

    TPP-Br (175°C)

  7. (g)

    TPP-Br (185°C)

  8. (h)

    TPP-Br (195°C)

Appendix 1: Adhesion test results

figure a

Appendix 2: Impact resistance test results

figure b

Appendix 3: CASS test results

figure c

Appendix 4: Recoatability results

figure d

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Lee, D.E., Lee, J.J., Cho, HJ. et al. Investigating the correlation between the curing behavior and properties of acrylic powder coatings. J Coat Technol Res 20, 1039–1052 (2023). https://doi.org/10.1007/s11998-022-00722-x

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  • DOI: https://doi.org/10.1007/s11998-022-00722-x

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