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Saturday, 21 September 2019
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Raw materials & technologies, Technologies

Self-photoinitiated oligomers of water-diluted polyurethane acrylate

Friday, 29 June 2018

In order to eliminate some problems of organic photoinitiators, self-photoinitiated oligomers of water-diluted polyurethane acrylate grafted with 0.1–0.3 wt.% zinc oxide (ZnO) were prepared.

The study demonstrated that novel oligomers grafted with ZnO of low concentrations can be self-photoinitiated. Source: kasto – stock.adobe.com.

The study demonstrated that novel oligomers grafted with ZnO of low concentrations can be self-photoinitiated. Source: kasto – stock.adobe.com.

ZnO was first facilely treated by vacuum dehydration and sonication, and then reacted into the oligomers by NCO and OH groups. The oligomers were synthesised using toluene diisocyanate, polyether diols, 2, 2-dimethylol propionic acid, hydroxyl propyl acrylate, pentaerythritol triacrylate, ZnO, and triethylamine. The prepared oligomers were characterised by Fourier transform infrared spectroscopy, scanning electron microscopy, particle size analyser, and UV–vis spectroscopy. The kinetics of the UV-curing process was investigated.

Self-photoinitiated and facilely preparation

The scientists observed a maximum kinetic rate constant with ZnO content of 0.2%, and the best film performance with ZnO content around 0.25%. The photoinitiation efficiency of the oligomers was similar to the value of 2-hydroxyl-2-methyl-1-phenyl-1-propanone. In general, the physical properties of the films with physically mixed ZnO were worse than those of the films with chemically grafted ZnO. This investigation demonstrated novel oligomers grafted with a few ZnO can be self-photoinitiated and facilely prepared.

The study is published in: Progress in Organic Coatings Volume 120, July 2018, Pages 208-216.

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