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Tuesday, 24 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Designing acrylic-styrenic coatings bearing reactive aldehyde functions

Wednesday, 6 May 2015

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

The polymers were cross-linked by phenol-aldehyde reaction with catechin, a natural and non-toxic phenolic compound. Source: Franz Pfluegl/Fotolia

The polymers were cross-linked by phenol-aldehyde reaction with catechin, a natural and non-toxic phenolic compound. Source: Franz Pfluegl/Fotolia

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

High level of 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 cross-linking system gives a high level of performance with high cross-linking 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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