Environmentally Friendly Water-Based Self-Crosslinking Acrylate Dispersion Containing Magnesium Nanoparticles and Their Films Exhibiting Antimicrobial Properties

Denisa Steinerová,Marcela Pejchalová,Jana Machotová,Andréa Kalendová

doi:10.3390/coatings10040340

Denisa Steinerová, Marcela Pejchalová + Show 2 more

Open Access

https://doi.org/10.3390/coatings10040340

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Journal: Coatings	Publication Date: Apr 1, 2020
Citations: 12	License type: CC BY 4.0

Affiliation: University of Pardubice

Abstract

A water-based polymeric acrylate dispersion (latex) containing MgO nanoparticles, which had been added at a concentration of 1.5% (with respect to the monomers) during the preparation procedure, was investigated as an environmentally friendly binder for sanitary interior paints. The properties of this new latex were compared to those of a reference system free of the magnesium nanoparticles, synthesized by the same route, i.e., by semi-continuous emulsion polymerization. Tests were made in order to ascertain the mechanical and chemical properties, flash corrosion resistance and antimicrobial effect of the latex films. The results revealed that the new latex containing magnesium nanoparticles provided solvent-resistant coating films having pronounced antimicrobial activity against all the tested bacterial and fungal strains. The desirable antimicrobial properties can be ascribed to the sharp-edged character of magnesium nanoparticles, the peroxidation of lipids and the formation of reactive oxygen species. Moreover, no flash corrosion was formed beneath coating films containing magnesium nanoparticles, which can be attributed to the alkaline action due to the dissolution of a fraction of MgO in latex medium. The results of all of the tests provided evidence of the superiority of the polymeric dispersion with the magnesium nanoparticles to the reference system containing no nanoparticles.

Highlights

A number of efforts are currently made to eliminate volatile organic compounds (VOC) from common use, meaning that water-based paints are coming to the fore [1,2,3]
Water-based paints and their coatings films are subject to microbial colonization, which is an effect that needs to be prevented not just because of their possible bio-deterioration associated with economic impact [7], and from health and safety reasons, as pathogenic microorganisms can be transferred from coatings to humans [8,9]
The latexes were prepared from monomeric methyl methacrylate (MMA), n-butyl acrylate (BA), methacrylic acid (MAA) and diacetone acrylamide (DAAM) supplied by Sigma-Aldrich, Prague, Czech

Summary

Introduction

A number of efforts are currently made to eliminate volatile organic compounds (VOC) from common use, meaning that water-based paints are coming to the fore [1,2,3]. The majority of water-based paints contain up to 80% water plus some organic solvents such as glycol ethers [4]. These paints are beneficial in that they are environmentally friendly, meeting both U.S Water-based acrylate dispersions (latexes) constitute a universal, high-quality and environmentally friendly option [10]. Their synthesis has been brought to a high level [11]. The interfacial crosslinking, using the keto-hydrazide self-crosslinking pathway, is based on a reaction of the carbonyl group (diacetone acrylamide) at the polymeric chain and a diamine (adipic acid dihydrazide (ADH)) dissolved in the aqueous phase. The advantages of this keto-hydrazide self-crosslinking include a fast reaction at normal temperatures and one-component composition [12,13,14]

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