CS249890B1 - Raw material mixture for matt glaze production - Google Patents

Abstract

The purpose of the solution is to improve the surface quality of matt glazes and achieve a high degree of whiteness in white matt glaze. The stated purpose is achieved by maintaining the stated weight percentage of the individual components of the raw material mixture, namely: 60 to 70% of silica and boric oxide based rubs, 7 to 19% of dolomite, 3 to 10% of floated kaolin, 18 to 24% of zinc white, traces of up to 1% of electrolyte and traces of up to 1% of flow agent. The addition of electrolytes such as sodium chloride, potassium chloride, etc. and flow agents such as sodium pyrophosphate, sodium carbonate, etc. is aimed at achieving optimal rheological properties of the glaze. The addition of ceramic pigments in a weight amount of 0.01 to 10 percent to the raw material mixture achieves a wide range of glaze color shades. Matt glaze is used in the production of facing materials, such as tiles, consumer ceramics, art ceramics, etc.

Description

249890

BACKGROUND OF THE INVENTION The present invention relates to a raw material composition for producing a matt glaze which, when applied to a ceramic casing and screed, is intended to form a smooth, good remelted, matte surface, free from surface defects, with a discharge temperature of 950 ° C to. 1000 ° C and firing time under 24 hours.

The previously used matt glazes are prepared on the basis of commercially produced matt frits. The matt frit is blended with an ido addition of 40% by weight of the frit, 5 to 10% by weight of the floated kaolin, electrolyte and flowmeter to the desired fineness. The addition of a cover frit in the preparation glaze controls the degree of matting of the glaze surface after firing, the addition of floated kaolin, the electrolyte, and the scrubber to monitor the achievement of optimum rheological properties of the glaze. The appearance of the finish of the matte glaze of the final product can be characterized as non-temperate, poorly remelted, with considerable surface defects such as craters, punctures, air bubbles in the glaze layer.

Another drawback of the thus prepared glaze is that a high degree of whiteness of the glaze after firing can only be achieved by adding micronized zirconium silicate in an amount of up to 20% by weight, which is very demanding in terms of the cost of this raw material.

The above mentioned drawbacks are eliminated by the matglazing prepared from the raw material composition of the present invention, which is based on a weight of 60 to 70% frits based on SiO2 silica and B02O3, 7 to 19% dolomite, 3 to 10% plaque. of kaolin, 18-24% zinc white, traces up to 1% electrolyte, traces up to 1% volatilizer.

Sodium chloride, potassium chloride and the like are used as the electrolyte. and, as the steucide, use sodium pyrophosphate, carbonate, and the like. With the addition of ceramic paints in an amount of 0.01 to 10% by weight, a wide variety of color shades can be achieved. Silica and boron oxide-based frits are blended with addition of zolite and zinc white as the paint reagents, float kaolin, electrolyte and agglomerate to the desired fineness, with a dry matter content in the glaze above 50%. After grinding to the desired fineness and achieving optimum rheological properties, the glaze is suitable for glazing.

By adhering to the composition of the raw material composition of the matt glaze according to the invention, the matt glaze is emptied by which a perfectly smooth surface is obtained, which is completely refined, matt, practically free from surface defects. The firing results in a high degree of whiteness of the matt glaze, which moves at the level of the whiteness of the glossy white glaze.

By using ceramic dyes, the possible glaze made from the raw material composition of the invention is dyed into a wide range of color shades. A temperature-expansion coefficient of 62.10 -7 K-1 is suitable. Examples of particular preparation and used glazes are as follows: Example 1

Weight composition of raw material mixture for the production of white matt glaze and its properties: frit based on S1O2, B2O3 (ZFR 6465) 61.1 dolomite Oslany 9.0 float kaolin Sedlec 7.0 zinc white 22.5 electrolyte (sodium chloride) 0, 2 Flow Liquid (Sodium Pyrophosphate) 0.2 Weighed raw materials were wet-wetted with a drum mill to a 0.25% residue on site0063. glazing volume density kinematic viscosity mass content dry weight 1 650 kg. m-33.6.10-6m2. s_162,5%

Glazing is realized on glazing. A coated glazing layer of 0.220 kg is applied to the fired potato shovel. m ~ 2 and a layer of matt glaze of 0.80 kg is applied to the glazed glazing. m-2, with a time interval between glossy glaze and glaze glaze being 4 s.

Mass composition of the raw material mixture for the production of glossy white glaze and its properties: frit based on S1O2, B2O3 (ZFR 6465) float kaolinSedium electrolyte (sodium chloride) flowing agent (sodium pyrophosphate) bulk density glaze kinematic viscosity weight content of dry matter 93% 7% 0.25% 0.05% 1,523 kg. m-32.0.10-6 m2. s-158%

The glazed tiles are burned at 960 ° C in a tunnel muffle furnace. The firing time is 22 hours.

Claims (2)

5 249890 Example 2 S1O2, B2O3-based frit Material composition of raw material (ZFR 6465) 81% for the production of blue matt glaze and its frit based on the properties: S1O2, B2O3 (ZFR 6470) 10% S1O2-based frit, B2O3 floated kaolin ZFR 6465) 51.4% Sedlec 7% S1O2-based frit, B2O3 blue dye (ZFR 6470) 10.0% ZrSiV 2% Dolomite Oslany 16.0% (K 204 68) Float kaolin Sedlec 3.2% Electrolyte 0.3% zinc white 18.5% (sodium chloride) blue dye based on ZrSiV (K 204 68) 0.5% (0.1 O / o carbonate (sodium chloride) 0.2% sodium) sodium pyrophosphate 0.25% glazure kinematics 1530 kg. m ~ 3 The weight of the raw materials is wet milled to a viscosity of 1.85.10 " m.sup.2 with a drum mill to a residue of 0.25% by weight 58% by weight 0063. dry weight content Glacial volume kinematic viscosity weight content of dry matter 1 645 kg. -33.6.10 ~ 6 m2 s-162.5% The process of glazing, the amount of deposits and the time spacing between glaze and glaze glazing are the same as in Example 1. The composition of the raw material mixture for the production of glossy blue glaze and its properties: Tile firing and time firing is also as in Example 1. (The surface of a matte glaze made from a dry mix of the invention appears perfectly smooth, matte, good remelted, virtually free of surface defects. It can be used in the production of facing materials such as tiles and floor tiles, consumer ceramics, artistic ceramics, etc. T 1. A raw material composition for the production of matt glazing characterized in that it is comprised of 60 to 70% silicon dioxide SiO2 and boron oxide B2O3, 7 to 19% dolomite, 3 to 10% floatkolin, 18 to 24% zinc white. , traces of inventing up to 1% of electrolyte, traces of up to 1% of steeping fluid. 2. A raw material composition for producing a matt glaze according to claim 1, characterized in that it contains ceramic dyes in a weight ratio of 0.01 to 10%.