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

Degradable polyurethanes based on polyester polyols for marine antifouling

Friday, 31 July 2015

Researchers have prepared star-shaped polyester polyols based on initiators (trimethylolpropane or pentaerythritol) and ɛ-caprolactone by polycondensation reaction.

The degradable PU coatings were effective for marine antifouling. Source: Rainer Sturm/pixelio.de

The degradable PU coatings were effective for marine antifouling. Source: Rainer Sturm/pixelio.de

They synthesised degradable polyurethane (PU) by mixing star-shaped polyester polyols and crosslinker agent (hexamethylene diisocyanate trimer).

Tests demonstrated beneficial effect

The hydrolytic degradation and water absorption experiments demonstrated that the PU films could erode in artificial sea water, which were controlled by varying the ratios of ɛ-caprolactone/trimethylolpropane and the arm number of star-shaped polyester polyols. The mechanical properties of PU films and coatings increased with decreasing the ratios of ɛ-caprolactone/trimethylolpropane and increasing the arm number of star-shaped polyester polyols. The surfaces of PU films and coatings kept eroding, which were revealed by scanning electron microscopy. The copper ion release rates from PU coatings reached steady state at about 31 days. The marine field tests of PU coatings demonstrated that the degradable PU coatings based on star-shaped polyester polyols were effective coatings for marine antifouling.

The study is published in: Progress in Organic Coatings, Volume 87, October 2015, Pages 161–170

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