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Tuesday, 24 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Studying the antifouling performance of polyurethane coatings

Wednesday, 4 May 2016

Chinese researchers from Dalian Maritime University prepared a type of polyurethane antifouling coating using 2,4-toluene diisocyanate and 1,4-butanediol as the hard segment and polyether polyols as the soft segment.

The coating of 40% hard segment content has the best antifouling performance. Source: Rudis-Fotoseite.de/pixelio.de

The coating of 40% hard segment content has the best antifouling performance. Source: Rudis-Fotoseite.de/pixelio.de

The influence of hard segment content on the chemical structure, mechanical properties, and surface properties of the coatings was investigated. Subsequently, the antifouling performance of the polyurethane coatings was investigated by benthic diatom adhesion and panel tests.

Surface properties change upon immersion in seawater

The results showed that coating H40 (polyurethane coating with a hard segment content of 40 wt.%) exhibited the best antifouling property. The antifouling performance of the coatings was further examined by evaluating the surface changes occurring in the polyurethane coatings during immersion in seawater. In situ diiodomethane contact angle measurements were performed to monitor such changes. The oil contact angle results were consistent with the results of the panel test. The oil contact angle and antifouling property are both determined by the surface roughness, which is determined by the level of microphase separation in the polyurethane coatings.

The study is published in: Progress in Organic Coatings, Volume 97, August 2016, Pages 115–121

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