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

Photopolymerisation process of UV powder coatings investigated

Thursday, 19 January 2012

New study highlights the suitability of such coatings for heat-sensitive substrates like wood based panels.

Study investigates properties of UV cured powder coatings
Source: Brenda Carson - Fotolia.com

Study investigates properties of UV cured powder coatings
Source: Brenda Carson - Fotolia.com

French Researchers (University of Haute Alsace) have correlated in their new study the characteristics of UV powder resins with the photochemical process and the final coating properties. RT-FTIR spectroscopy equipped with an environmental cell was implemented to follow photopolymerisation reactions of UV powder systems under temperature control. The influence of additional acrylate monomers into UV powders was assessed and linked to the properties of the final coatings. An increase in concentration of reactive functions was found to lead to higher reactivity, even for relatively low working temperature. Researchers have investigated glass transition temperature, crosslinking density and resistance towards scratch and solvent. These properties were found to be significantly improved, even for systems exhibiting a non negligible amount of unreacted groups after the curing step. These results highlight the suitability of such coatings for heat-sensitive substrates like wood based panels largely used in the furniture market. The study will appear in "Progress in Organic Coatings”, vol. 73, issue 2-3, 2012, pp. 250-256.
To the abstract of the study

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