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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Evaluating tannin as antifouling agent in...

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

Evaluating tannin as antifouling agent in epoxy paint for marine application

Friday, 6 February 2015

Development of non-toxic or less toxic paints has become a target for researchers due to the awareness of the impacts from the use of toxic antifouling paints.

One of the modern alternatives to produce an environmental friendly paint is by using natural products. Source: virtua73/Fotolia

One of the modern alternatives to produce an environmental friendly paint is by using natural products. Source: virtua73/Fotolia

One of the modern alternatives to produce an environmental friendly paint is by using natural products. This study investigated the mangrove, Rhizophora apiculata tannin derivatives (zinc tannate) for antifouling properties by incorporating the powdered extract with different amount in epoxy paint formulation.

Mangrove bark extract was sensitive to all target bacteria

The antifouling activity of zinc tannate was proved by antifouling crystal violet assay and the specimens have been exposed in seawater environment. The initial and final weights of mild steel were recorded to obtain the mass accretion which indicates the weight of biofouling settlement over the specimen surface. The effectiveness of this antifouling agent depends on the amount of zinc tannate in the paint and their leaching rate in seawater. Low concentration of zinc tannate (2.736 mg/ml) was found sufficient to inhibit the growth of bacteria, Bacillus cereus.

The study is published in: Progress in Organic Coatings, Volume 81, April 2015, Pages 125-131

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