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Wednesday, 18 September 2019
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Raw materials & technologies, Technologies, UV/EB Coatings

Environmental friendly alternative to oil oxidation for the preparation of fatty coatings

Tuesday, 29 November 2016

In the quest for green and friendly processes in polymer chemistry, French researchers report a new process for bio-based coatings as an attractive alternative to the common drying of oils.

Fatty coatings are composed of 80 wt-% native or stand linseed oil. Source: Verena Münch/pixelio.de

Fatty coatings are composed of 80 wt-% native or stand linseed oil. Source: Verena Münch/pixelio.de

This process involves the photoinitiated thiol-ene chemistry under air for the preparation of linseed oil-based biocoatings.

Beneficial effect

Several parameters were investigated to determine the optimal formulation composition and irradiation conditions. Native or stand linseed oil triglycerides were then crosslinked in the presence of 0.5 equivalent of various thiols (SH/ene) under 20 min UV exposure, without photoinitiator nor solvent. 10–20 μm thick coatings constituted of about 80 wt% of linseed oil were obtained. They exhibited at least equal physico-chemical properties compared to coatings dried by simple oxidation. It was found that oxidation of fatty moieties occurred during and after irradiation and has a beneficial effect on the properties of the final coatings.

The study is published in: Progress in Organic Coatings, Volume 101, December 2016, Pages 216–224

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