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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Polymer microparticles with silver nanopar...

Tuesday, 17 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Polymer microparticles with silver nanoparticles reduce fouling

Monday, 26 May 2014

Gelatinous polymer matrix microparticles containing silver nanoparticles (AgNPs) were prepared by a novel method to obtain quasi non-swelling anti-fouling paint additives with slow-release characteristics.

The cristall  of the encapsultated  AgNPs is about 18 nm large Source: Gunnar 3000-Fotolia.com

The cristall  of the encapsultated  AgNPs is about 18 nm large Source: Gunnar 3000-Fotolia.com

A w/o type dispersion were elaborated with the aqueous phase of gelatin, urea, silver-nitrate and formaldehyde dispersed in linseed oil.

Product serves as additive for coatings in wet conditions

Gelatin was cross-linked by formaldehyde, together with urea for limiting the swelling of the product. Silver-nitrate was reduced with the assistance of gelatin and formaldehyde into homogenously dispersed AgNPs. The microparticles and embedded AgNPs were visualized by scanning and transmission electronmicroscopy. Encapsulated AgNPs with ∼18nm crystallite size were identified by X-ray powder diffraction. Characterization of gelatin-urea-formaldehyde polymer matrices was carried out by attenuated total reflectance FTIR spectroscopy. Silver dissolution from microparticles and paints with AgNP-containing microparticles was measured by inductively coupled plasma spectrometer and resulted in highly sustained release, compared to unmodified gelatin microparticles and paints containing encapsulated silver salts. A 7-month-long fouling experiment run in natural sweetwater media showed that solvent-based acrylic paint with AgNPs-containing gelatinous microparticles as additives offered resistance against biofouling at low Ag-release ratio.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 7, July 2014, Pages 1226-1232.

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