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Sunday, 15 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Designing innovative acrylic-styrenic coatings bearing aldehyde functions

Tuesday, 31 March 2015

French researchers synthesised acrylic-styrenic coatings bearing reactive aldehyde functions by copolymerisation of vinylbenzaldehyde with methyl methacrylate, butyl acrylate and styrene comonomers.

Crosslinking study of oligomeric-size aldehyde compounds with bio-based and non toxic phenolic compounds. Source: AkzoNobel

Crosslinking study of oligomeric-size aldehyde compounds with bio-based and non toxic phenolic compounds. Source: AkzoNobel

These polymers were crosslinked by phenol-aldehyde reaction with catechin, a natural and non-toxic phenolic compound.

Alternative crosslinking system shows high performance

First, model studies confirmed that aldehyde functions on the polymer chain remain reactive toward phenolic compounds. Then, acrylic-styrenic oligomers were synthesised with different aldehyde function concentrations from 0 to 6%w and, tuning butylacrylate composition, with different glass transition temperatures for coating applications. Lastly, after screening those two parameters, the analytical tests of the cured coatings confirmed that this alternative crosslinking system gives a high level of performance with high crosslinking degree, high thermal stability, good adhesion properties and excellent impact resistance.

The study is published in: Progress in Organic Coatings, Volume 84, July 2015, Pages 1-8.

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