ANTIBACTERIAL ZINC-CONTAINING SEMI-COATED GLAZES FOR PORCELAIN STONEWARE

The results of research on the synthesis of zinc-containing glaze coatings with antibacterial properties used for porcelain stoneware are presented. The glaze coatings were obtained by single firing at a temperature of 1200  5°С for 60  2 minutes using a multicalcium frit synthesized in the Na2O–K2O–CaO–MgO–Al2O3–B2O3–SiO2 system. Zinc whitewash, dolomite, as well as alumina, feldspar, quartz sand, kaolin and refractory clay are also used in the multicomponent raw material mixture. The technological modes of obtaining coatings are determined, their decorative characteristics and physico-chemical properties in a wide range of compositions are studied. The antibacterial activity of the glazes in relation to the test strains of Escherichia coli and Staphylococus aureus was determined. The structure and phase composition of coatings, depending on the compositions, and the processes of phase transitions during their formation are studied.