SU1390219A1 - Method of preparing porcelain slip - Google Patents

Abstract

The invention relates to the preparation of a porcelain slip used in the casting of sanitary ceramic products. In order to reduce the viscosity of the slip, sodium citrate is added to it in an amount of 0.05-0.5 by weight of dry matter in the slip. Humidity of the puffer is 30%, the time of the outflow of the slip from the viscometer in 30 seconds 6.0-10.0 s, the coefficient of thickening 1.4-1.8, pH 8.3-8.7. 1 tab.

Description

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The invention relates to the manufacture of ceramic products, in particular to the use of expanding additives for slips used to produce sanitary ceramics by the method of casting.

The purpose of the invention is to reduce the viscosity of the slip.

Sodium citrate is a sodium salt of citric acid (hydroxycarbonallylic acid or 2-hydroxide-1,2,3-propane tricarboxylic acid). Structural formula:

CH-COONA HE-SOOK

, 2 +

Sodium citrate is a water-soluble organic compound. When dissolved in water, sodium citrate dissociates to form Na d cations and fairly large organic anions. Na cations enter into ion exchange with Ca cations adsorbed on clay particles, and contribute to the creation of more powerful diffuse layers around them. In turn, anions of citric acid with the released cations form a slightly soluble compound Ca3 (jO-,) ,,, and thus shift the equilibrium concentration of Na cations and in the direction of the predominance of the NIN cation, preventing reverse exchange. In addition, citric anions are adsorbed (with the participation of hydrogen bonds) along the edges and hydroxyl planes of clay particles, neutralizing areas with positive charges, preventing the coagulation of clay particles and the formation of structure

ten

15

25

thirty

20 35 40

3902192

type of house of cards. This suggests that sodium citrate combines the properties of deflocula nta and the stabilizer of porcelain slips, which serves as soda and soluble glass at the same time. All this leads to high activity of sodium citrate as a thinner of porcelain slips used to produce sanitary products by the casting method.

Foundry porcelain mass (slip) is prepared by separately grinding non-plastic materials (quartz sand, pegmatite and bo porcelain products after firing) in porcelain mills and then mixing them with plastic materials pre-liquefied in propeller brooms - refractory clay and kaolin. A diluent is introduced into the slurry - sodium citrate 0.05-0.5% by weight of dry matter in the slurry. The grinding is carried out to a residue on a sieve of 0.063 1-2%. Casting products produced in

plaster molds. I

The table shows the technical

characteristics of the porcelain mass, depending on the type and amount of thinners introduced into the mass.

Claims (1)

Invention Formula A method for preparing a porcelain slip by introducing a citrate compound into it, characterized in that, in order to reduce the viscosity of the slip, sodium citrate is added as a citrate in an amount of 0.05-0.5% of the dry matter in the slip. Lemon Sodium Limonioki sly sodium . 10.0 1.8 8.3 6.0 8.0 1.5 8.5 6.2 Citric acid sodium, 5 Citric acid 0.1-0.65 Table continuation 6.0 1, A 8.7 6.4 Not flowing coaguli qi slip