Novel antibacterial wood coatings

A new study portrays antibacterial wood coatings with soybean protein isolate nano-silver hydrosol.

The composite film had good antibacterial properties. Image source: denisismagilov - (symbol image).

As the new coronavirus pneumonia swept the world in 2020, the demand for antibacterial products significantly increased. In a new study, a soy protein isolate nano-silver hydrosol was prepared using an environmentally friendly Ag+ in situ reduction process, where the soy protein was ultrasonically blended with polyacrylic resin to obtain a polyacrylate-nano silver antibacterial wood coating. The structure of the soy protein isolate nano-silver hydrosol was assessed, and the structure and antibacterial and mechanical properties of the film were characterised. The results showed that the silver nanoparticles (AgNPs) exhibited good crystallinity and were evenly distributed in the emulsion.

Good antibacterial properties

The composite film had good antibacterial properties against gram-negative bacteria represented by Escherichia coli and gram-positive bacteria represented by Staphylococcus aureus. With increased nano-silver content, the diameter of the inhibition zone increased from 0 to 30 mm, and from 18 to 50 mm for the two bacteria, respectively. Moreover, the elastic modulus of the film increased from 8.173 to 97.912 MPa, and the elongation at break decreased from 240.601 to 41.038% as the content of AgNPs changed from 0.1 to 1%, respectively. Thus, this study provides a new method for preparing waterborne polyacrylate coatings with excellent antibacterial properties.

The study has been published in Progress in Organic Coatings, Volume 165, April 2022.

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