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Saturday, 21 September 2019
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Raw materials & technologies, Science today - coatings tomorrow

Study on microcapsule-based self-healing anticorrosive coatings available

Thursday, 20 September 2012

Researchers from the Technical University of Denmark and R&D Specialists from Hempel investigated the ways of reducing the size of poly(urea–formaldehyde) microcapsules, filled with linseed oil and intended for a microcapsule-based self-healing anticorrosive coating. The influence of microcapsules on epoxy coating performance was also studied.

Microcapsule-based self-healing anticorrosive coatings were investigated / Source: Fotolia

Microcapsule-based self-healing anticorrosive coatings were investigated / Source: Fotolia

The synthesis parameters investigated are stirrer geometry, agitation rate, temperature, and stabilizer concentration. It was found that an increase in stirring rate, correct choice of temperature, and a high stabilizer concentration all caused a decrease in microcapsule size but were accompanied by excessive formation of nanoparticles.

Addition of capsules does not compromise coating performance

Researchers evaluated coating performance using salt spray exposure and impact testing. Results of the impact testing showed that addition of microcapsules to a binder matrix did not compromise resistance of the coating to mechanical damage and led to formation of fewer and shorter cracks compared to a filler-containing coating. Flaking of the coating was also reduced.

Exposure testing

Results of the salt spray testing (3 weeks exposure) showed that with an increase of microcapsule content, in the interval 30-50 vol%, the extent of corrosion and potential coating delamination decreased and was identical to that of a full commercial anticorrosive coating.

The complete study "Microcapsule-based self-healing anticorrosive coatings: Capsule size, coating formulation, and exposure testing” will appear in "Progress in Organic Coatings”, issue 4, vol. 75, pp. 309-318.

related links:

To the abstract of the study

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