Investigating the weathering performance of epoxy silicone nanocomposite coatings containing various loadings of Glycidoxypropyltrimethoxysilane-modified Zinc oxide nanoparticles

This research presents the modification of ZnO nanoparticles by Glycidoxypropyltrimethoxysilane (GPTMS) to produce hybrid nanostructured additives to improve the weathering resistance of epoxy silicone coatings. The modified ZnO nanoparticles were incorporated into epoxy silicone coatings at differe...

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Bibliographic Details
Published in:Progress in organic coatings 2022-11, Vol.172, p.107094, Article 107094
Main Authors: Amrollahi, S., Yari, H., Rostami, M.
Format: Article
Language:English
Subjects:
Additives
Carbonyls
Coatings
Contact angle
Diamond pyramid hardness
Fillers
Gloss
Low level
Nanocomposites
Nanoparticles
Optical microscopes
Weathering
Zinc oxide
Zinc oxides
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Summary:This research presents the modification of ZnO nanoparticles by Glycidoxypropyltrimethoxysilane (GPTMS) to produce hybrid nanostructured additives to improve the weathering resistance of epoxy silicone coatings. The modified ZnO nanoparticles were incorporated into epoxy silicone coatings at different loading dosages. The coatings were then weathered in an accelerated weathering chamber and removed after specific intervals (0, 500, and 1000 h) for further characterization. The effect of different loadings of modified ZnO nanoparticles (0.1, 0.5, and 1 wt%) on the weathering resistance of epoxy silicone coatings was studied using SEM, AFM, FTIR, and contact angle measurement, UV–visible spectroscopy, optical microscope, gloss, Vickers hardness, and gonio-spectrophotometer. All results showed that the addition of modified nanoparticles effectively promoted (6 times improvement based on carbonyl index) the weathering resistance of the epoxy silicone coating. It was also concluded that the coatings filled at a low level (0.1 wt%) of GPTMS-modified ZnO provided much more superior weathering performance than those loaded with higher filler content (0.5 and 1 wt%). It was explained by the more crosslinked network formed and the fine distribution of modified filler within the matrix at low filler content.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2022.107094