Degradation of acrylic-melamine based varnish containing Tinuvin 292 with accelerated exposure in fluorescent UV and condensation

Authors

  • Trung Thanh Nguyen*

Keywords:

accelerated exposure testing, acrylic-melamine varnish coating, degradation, FT-IR, physico-mechanical properties, thermal oxidation resistance, Tinuvin 292

Abstract

The durability of an acrylic-melamine (AC-ML) based varnish containing Tinuvin 292 when exposed to 100 cycles of accelerated exposure testing in fluorescent UV and condensation was investigated. Fourier-transform infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA), and scanning electron microscope (SEM) were used to evaluate the changes between the initial and aged coatings. The obtained results showed that gloss loss, adhesion, flexibility, impact resistance, and relative hardness of the AC-ML varnish were enhanced with 2.5 wt.% of Tinuvin 292. FT-IR spectrums of the initial and aged samples without Tinuvin 292 illustrated strong changes in intensity of CH2 and C=O (ester) groups. AC-ML varnish with 2.5 wt.% of Tinuvin 292 exhibited changes in the peaks of the CH2 and ester groups after accelerated exposure testing. SEM images showed that the surface of the aged AC-ML varnish without Tinuvin 292 was rougher than that of the coating with Tinuvin 292. TGA results also showed that 2.5 wt.% of Tinuvin 292 had improved thermal oxidation stability of the AC-ML based varnish.

DOI:

https://doi.org/10.31276/VJSTE.65(3).21-26

Classification number

2.2, 2.3

Author Biography

Trung Thanh Nguyen

Institute of Technology, General Department of Defence Industry, Dong Ngac Ward, Bac Tu Liem District, Hanoi, Vietnam

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Published

2023-09-15

Received 1 July 2022; revised 22 September 2022; accepted 28 September 2022

How to Cite

Trung Thanh Nguyen. (2023). Degradation of acrylic-melamine based varnish containing Tinuvin 292 with accelerated exposure in fluorescent UV and condensation. Vietnam Journal of Science, Technology and Engineering, 65(3), 21-26. https://doi.org/10.31276/VJSTE.65(3).21-26

Issue

Section

Physical Sciences