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Sunday, 15 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Polyurethane self-polishing coating for marine antifouling application

Wednesday, 13 April 2016

To fabricate antifouling coatings, Chinese researchers have prepared a series of environmentally friendly thermoplastic poly(propylene carbonate) polyurethane (PPCU) by two-step condensation polymerisation.

A series of environmentally friendly thermoplastic poly(propylene carbonate) polyurethane (PPCU) was used to fabricate antifouling coatings. Source: Rainer Sturm/pixelio.de
A series of environmentally friendly thermoplastic poly(propylene carbonate) polyurethane (PPCU) was used to fabricate antifouling coatings. Source...

The poly(propylene carbonate) (PPC) segments served as degradable moieties.

Coating possessed antibiofouling ability

Quartz crystal microbalance with dissipation (QCM-D) measurements revealed that the polyurethane could degrade in the presence of enzyme and the degradation rate increases with the decrease of the molecular weight of the polyurethane. Investigation on the hydrolytic degradation behaviour and the release rate test of the antifoulants in artificial seawater also demonstrated that the hydrolysis rate and the release rate increased as the molecular weight decreased, which makes the coating controllable at the hydrolysis rate range of 0.012–0.051 g/(m2d). Marine field tests and algae settlement assay tests revealed that the polyurethane coating possessed antibiofouling ability due to its self-renewal property and the release of antifoulants.

The study is published in: Journal of Applied Polymer Science.

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