Water-borne polyurethane–silver nanoparticle antibacterial coating

An antibacterial coating composed of silver nanoparticles and water-borne polyurethane was synthesised for use on synthetic leather.

The scientists prepared silver nanoparticles and used them as nanofiller to impart antibacterial property. PublicDomainPictures / Pixabay. -

In a new study, silver nanoparticles were prepared and used as nanofiller to impart antibacterial property. Silver nanoparticles were synthesised by using poly(vinyl pyrrolidone) as dispersant and sodium borohydride (NaBH4) as reducing agent. Silver nanoparticles were characterized by transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) analysis.

Synthesising water-borne polyurethane

The optimum dispersant was selected according to the zeta potential of dispersions. Water-borne polyurethane was synthesised by using isophorone diisocyanate, 2-bis(hydroxymethyl)propionic acid, triethylamine, and polytetramethylene ether glycol. Water-borne polyurethane–silver antibacterial coating was obtained by ultrasonic dispersion, and then cast on the surface of synthetic leather.

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Investigating antibacterial property

The antibacterial property and coating adhesion were investigated. The results showed silver nanoparticles homogeneously dispersed in waterborne polyurethane and adhesion reaching grade 4. Antibacterial testing showed bacterial reduction of 99.99% for Escherichia coli and 87.5% for Staphylococcus aureus.

The study is published in: Journal of Coatings Technology and Research  March 2018, Volume 15, Issue 2, pp 415–423.

Image source: Pixabay

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