Properties of UV-curing matting coatings

Scientists have evaluated the effect of the particle sizes of silica on the properties of UV-curing matting coatings.

A laboratory scene.
The addition of ceria with a content of 5 wt% was the most effective to enhance hydrophobicity. Image source: totojang1977 (symbol image)

UV-curable matting composites were prepared by micron silica matting agent, polyether diol (PPG), isophorone diisocyanate (IPDI), and 2-hydroxyethyl methacrylate (HEMA) via the in situ polymerization method. The structure, surface morphology, and thermal stability of the composites were characterised by FTIR, SEM, and TGA, respectively. As the main resin in the UV-curable coating, the effects of particle sizes of silica on the gloss, abrasion resistance, adhesion, and hydrophilic properties of coatings were measured.

The smaller the particle size, the lower the gloss

The results show that the agglomeration phenomenon of the modified silica in the composite coating was obviously improved. The smaller the particle size, the lower the gloss of coatings with the same content. The adhesion strength and abrasion resistance of the composites were superior to those of pure UV-curing coatings without silica. The greater the particle sizes of the added modified silica, the stronger the hydrophilicity of the composite.

The study has been published in Journal of Coatings Technology and Research, Volume 18, 2021.

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