CS217370B1 - baking paint based on glass dye for decoration of ceramic and porcelain objects. - Google Patents

Abstract

The invention relates to a firing paint based on glass pigment for decorating ceramic and pozzolanic objects. It solves the problem of damaging the decor before final firing. The essence of the paint according to the invention is that it contains 5 to 65 parts by weight of glass pigment, 1 to 55 parts by weight of organosilicon polymer and 5 to 90 parts by weight of an organic solvent, for example ΰό-terpineol, turpentine oil or xylene. The organosilicon polymer is formed by a solution of polymethylphenyl silicone with a ratio of phenyl and methyl groups of 0.5 to 1.3 and a ratio of methyl and phenyl to silicon of 1.2 to 2, or a solution of poly- -m-carborane silicone with a ratio of carborane to silicone from 2:1 to 4:1.

Description

BACKGROUND OF THE INVENTION The present invention relates to a baking dye based on a glass dye for decorating ceramic and porcelain articles, which is particularly suitable for glazing decoration.

The firing colors for the decoration of porcelain and ceramic articles consist essentially of a dye, a binder and a diluent.

Glass dyes are usually inorganic compounds, in particular metal oxides, of high melting point and of constant color shade.

Binders and diluents are of organic origin. The most commonly used binders are essential oils, balsams and synthetics resins. Diluents are high boiling solvents, for example turpentine oil, turpentine, decalin, terpineols. The dyes do not dissolve in the binder or the diluent and form with these components a suspension suitable for application to porcelain or ceramic by the appropriate theobnik. After evaporation of the diluent, the baking process of relatively low temperatures flows out during the baking process and the glass stain is combined with porcelain, res. ceramic. After this process, the glass dye retains the shape given to it with the binder and diluent when applied to the respective mass.

Basically, two teohniks are currently used to apply paint to porcelain or ceramic products. The first is older and consists of so-called ooelprinting, ie the relevant decor or mark is engraved in a flat and smooth ooel plate in the required size.

The color of suitable consistency is pressed by hand or machine wiping into the relief of the décor and the excess color is completely removed from the back. The speoial tissue paper (oigarette) is then applied to the plate and the paint is adhered to and removed from the plate. After. decor, the decor and the paper are glued to a porcelain or ceramic object and after moistening the paper is removed and the glass color remains on the object. After the object has been fired, the binder is removed from the paint and the object is ready for glazing and re-firing.

The second method of applying paint, respectively. decor is much more modern and less labor productivity. It consists essentially of applying the ink by screen printing to the elastic membrane from which it is then transferred to a ceramic or porcelain article, usually pneumatically. The decor is then fired with the object, subjected to glazing and fired for the last time. ·

The disadvantage of the existing colors under the glaze on porcelain and ceramic objects is that the binders of these colors are removed during firing and at this prooess they disrupt the strength of the decor, which eventually remains binder free and is easily disturbed by the slightest meohaniok touch, both during handling firing, so 1 in the glazing process. Damaged decor after firing is very retouched very well, which requires specially trained sprinklers. Damaged decor during glazing cannot be retouched and the product becomes scrap.

These drawbacks are eliminated by color firing for the decora- tion of ceramic and porcelain articles. The essence of said baking ink is that it contains 5 to 65 parts by weight. glass dye, 1 to 55 parts by weight. % organosilicon polymer and 5 to 90 wt. parts of an organic solvent such as β-terpineol, turpentine oil or xylene. The organosilicon polymer consists of a solution of polymethylphenylsilicone having a ratio of phenyl to methyl group of 0.5 to 1.3 and a ratio of methyl and phenyl to silicon of 1.2 to 2, or a solution of poly-m-carborane silicone with a ratio of carborane to silicone of 2: 1 to 4 : 1.

An advantage of the inventive harvests is that the dye is fixed by the polymer in the applied decor. The organometallic polymer binder is not removed by firing from the paint, but instead becomes a new chemical structure that resists normal mechanical handling when handling the product. The polymer binder mixes very well and is compatible with the glass stain and provides a color suitable for application to porcelain and ceramic articles by conventional techniques. After applying the decor, the paint dries quickly and holds the drawing well according to the pattern. The surface of the color decor is glossy and the artwork is sharp. The applied decor does not require virtually retouch, as it does not disturb. Another important advantage of the inventive ink is that no changes are necessary in the present process equipment.

The baking paint for decoration of ceramic and porcelain products is described in more detail in the following examples:

Example 1 parts by weight. of the cobalt dye was mixed with 40 parts by weight of cobalt dye. of a solution containing 20 parts by weight of the composition; % polymethylphenylsilicone having a ratio of phenyl to methyl of 0.78 and a ratio of methyl and phenyl to silicon of 1.7, 10 parts by weight; xylene and 30 parts by weight. o -terpineol. The mixture was thoroughly mixed in a dyeing three-roll mill and applied by screen printing through an elastic membrane to a porcelain article. Paint dries within 1 minute. After the pre-firing at 700 ° C has been fired, the decor is not scrubbed again. Then the decor item was glazed and it was found that the decor perfectly received the glaze. After firing the oglazed ballast at a temperature of 1370 ° C, the decor shows a sharp drawing and a characteristic color shade.

Example 2

200 parts by weight cobalt dye was mixed with a solution prepared from 36 parts by weight. a thermosetting polymethylphenylsilicone resin having a ratio of phenyl to methyl of 1.01 and a ratio of phenyl and methyl to silicon of 1.9 by dissolving in 40 parts by weight. of turpentine oil and thoroughly blended in a three-roll dye mill and further applied and processed as in Example 1. The obtained decor was distinguished by excellent adherence to the article and did not wipe off both before and after firing. In the final stage the decor had a sharp drawing with a characteristic color shade.

Example 3

300 parts by weight the cobalt dye was ground together with a solution consisting of 45 parts by weight. Polymers-m-carboran silicone with a 3: 1 carborane / silane ratio, 150 parts by weight. xylene and 35 parts by weight. O-terpineol. The prepared color composition is a homogeneous, supple, viscous mass which is very well applied to the foreplay by screen printing. The decor on the forehead is very firm, before firing 1 after firing. The glazing process took place very large, without disturbing the décor of burning the oglazed preheat.

Claims (3)

A PSEDMET OF THE INVENTION 1. A glass dye-based firing ink for ceramic and porcelain articles, in particular for glazing decoration, comprising 5 to 65 parts by weight. glass dye, 1 to 55 parts by weight. % organosilicon polymer and 5 to 90 wt. parts of an organic solvent, for example -terpineol, turpentine oil or xylene. A baking ink according to claim 1, characterized in that the organosilicon polymer consists of a solution of polymethylphenyl silicon having a ratio of phenyl to methyl of 0.5 to 1.3 and a ratio of methyl and phenyl to silicon of 1.2 to 2. 3. The baking ink according to claim 1, wherein the organosilicon polymer is a solution of poly-.alpha.-carborane silicone having a carborane to silicone ratio of from 2: 1 to 4: 1.