Procedure for the production and use of porcelain stoneware tiles with antibacterial activity

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Patent Details

Publication Number
WO2012018273
PT105240
Priority Date
2010-08-06
Publication Date
2012-02-09
International Patent Classification
C04B41/89
C09C1/00

Figures

figura
Reduction of tested bacteria in contact with ceramic pieces containing distinct amounts of pigment.

Abstract

The present invention describes the production process to obtain porcelain stoneware tiles with antibacterial action. The material promotes the bacteria’s death, while all the other required technological characteristics, particularly the chemical resistance and anti-staining properties, are assured. The product is made from a porcelain stoneware paste with a black ceramic pigment containing iron and chromium in its composition; the deposition, by jet spraying, of a small layer of a transparent glaze (typically used to enhance the surface characteristics) and the firing schedule is similar to that used to obtain similar products. Once fired, a chemical (sodium nitrate and silver nitrate solution) and thermal (at 4300 ºC) treatment is optionally carried out. Under optimized conditions the material shows effective antibacterial action: killing of 77% S. Aureus bacteria and 81% E. Coli bacteria, i.e., the survival percentage of the tested bacteria is only about 20%.

Innovative aspects & main advantages

The present invention describes the production process to obtain porcelain stoneware tiles, for use as floor or wall coating, with excellent antibacterial properties. The technical features associated with this type of material (high chemical and deep abrasion resistance and anti-staining properties) are not affected.
The novelty of this product comes from the combination of the ancient knowledge about the antibacterial effect of some heavy metals (e.g. Ag, Fe, Cr), and a high performance building ceramic material. Moreover, part of the anti-bacterial action is achieved only by using ceramic pigments, a raw material commonly utilized in this type of product in order to obtain aesthetic effects, for which the antibacterial action was never reported.

Applications

The potential industrial sectors for this invention are the wall and floor ceramic tiles producers, in particular the porcelain stoneware tiles manufactures. The industrial production of the developed product does not require any equipment beyond that which these plants typically have.

Inventors

Seabra, Maria; Batista, João; Grave, Cristina

Our Inventors

foto João António Labrincha Batista

João António Labrincha Batista

Associate Professor with Aggregation
foto Maria Paula Seabra

Maria Paula Seabra

Assistant Professor

Applicant

Universidade de Aveiro

Groups Involved

4 - biorefineries, biobased materials and recycling

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