RU2237036C1 - Dry plaster mix - Google Patents

Abstract

FIELD: manufacture of building materials.

SUBSTANCE: dry plaster mix suitable for finishing operations contains, wt %: gypsum 94.0-96, perlite 2.6-3.6, lime 1.13-1.8, retardant 0.032-0.042, cellulose ether 0.082-0.12, re-dispersed latex powder 0.02-0.03, starch ether 0.082-0.12, and air-entraining additive 0.02-0.03. Mix can be used when plastering walls with rough surface.

EFFECT: improved plasticity and increased water retention.

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Description

The invention relates to the production of building mixtures, in particular to obtaining dry building mixtures for the production of finishing work.

Known gypsum mixture according to patent No. 2090533 (publ. 09/20/97), including semi-aquatic gypsum and the addition of alkaline effluents for the production of caprolactam based on dicarboxylic acids SHCHSPK, it additionally contains a multidentate chelating ligand and trisodium phosphate in the following ratio, wt.%: Semi-aquatic gypsum 47 -72; the addition of alkaline effluents for the production of caprolactam based on dicarboxylic acids ShchSPK 0.2-0.8; multidental chelating ligand 0.03-0.15; trisodium phosphate 0.05-0.1; water is the rest.

The described composition has the following disadvantages: the stability of the composition due to its water-emulsion state is limited, the resulting coating has low adhesive strength.

The closest analogue is a dry stucco mixture containing gypsum, lime, a moderator, ether cellulose and an air-entraining additive (see KZ 11511 A, publ. 15.05.2002).

The invention solves the problem of creating a dry stucco mixture providing improved adhesion properties and extended setting time.

To achieve the technical result, a dry stucco mixture, including gypsum, lime, a moderator, ether cellulose and an air-entraining additive, additionally contains perlite, redispersed latex powder and starch ether in the following ratio of components, wt.%:

Gypsum 94-96

Perlite 2.6-3.8

Lime 1.13-1.8

Retarder 0.032-0.042

Ether cellulose 0.12-0.15

Redispersed latex powder 0.015-0.04

Ether of starch 0,082-0,12

Air entraining additive 0.02-0.03

The resulting mixture is based on gypsum with additives, which can be used for plastering walls with a rough surface. The mixture is plastic and has increased water retention.

Dry plaster mix is obtained by mixing gypsum, perlite and lime with special additives. For example, tartaric acid, citric acid, glycerin are used as retardants, and Bermodoll AEA 2800, nonionic hydrophilic powder, saponified wood pitch, sodium abietate, is used as an air-entraining additive. The dosage of the components of additives for the production of dry mixtures is designed to give the mixture plasticizing qualities and water-holding properties. Semi-aquatic gypsum or anhydrite is used as gypsum, and carboxymethyl cellulose or tylose as etherocellulose.

The solution is prepared as follows: pour the mixture into clean cold water in a ratio of 1: 0.7 and mix to a homogeneous (without lumps) consistency manually or using a mixer.

The setting time of the solution depends on the surface being treated. The setting time of the mortar mixture (including cooking, applying and grouting) is 55 ± 10 minutes from the beginning of mixing. The prepared plaster mortar can be used within 20 minutes from the moment of mixing. The mixture does not emit harmful chemicals into the environment and belongs to class 1 in terms of the specific effectiveness of natural radionuclides.

The proposed composition has the following advantages:

- firstly, convenience in work, which is expressed in the fact that mixtures of this brand are quickly prepared, do not form lumps, and easily and efficiently fit on the surface to be treated;

- secondly, the high quality of the final product, primarily water resistance and resistance to mechanical stress;

- thirdly, safety for health, because mixtures, on the one hand, do not contain chemically harmful substances, and on the other hand, have high air permeability;

- fourthly, the optimal combination of high quality and affordable price, which naturally depends on the components that make up the recipe.

The experience of using dry mixes in construction has shown their high efficiency and advantages compared to traditional solutions based on a mixture of sand and cement.

For experimental verification of the claimed composition, mixtures were prepared, two of which (2 and 3) showed optimal results (see tables 1 and 2). The composition of the dry mixture with the invention is shown in examples 2-3 of table 1, as well as examples 1, 4 of the control compositions. The analysis of the obtained coatings on the surface of the tested samples in accordance with the compositions indicated in examples 1-4 are given in table 2.

From the analysis of the mixtures it follows that an increase or decrease in the amount of moderator, ethercellulose and redispersed latex powder, starch ether, and air-entraining additives leads to a decrease in the compressive strength, to an increase in the ductility of the composition and the ability of water retention.

An increase or decrease in the content of gypsum and lime in the composition leads to a deterioration of the technological parameters of the coatings, to a deterioration of the coatings during operation, to a deterioration of the coatings in terms of moisture resistance.

An increase in perlite beyond the stated limits leads to a deterioration in workability of the coating. An increase and decrease in the percentage of perlite beyond the stated limits leads to a decrease in adhesive strength.

According to this invention, a mixture based on gypsum with additives is obtained, which can be used for plastering walls with a rough surface providing plasticity and increased water retention.

Claims (1)

A dry plaster mixture comprising gypsum, lime, a moderator, etherocellulose, an air-entraining additive, characterized in that it additionally contains perlite, redispersed latex powder and starch ether in the following ratio of components, wt.%: Gypsum 94-96 Lime 1.13-1.8 Retarder 0.032-0.042 Ether cellulose 0.12-0.15 Air entraining additive 0.02-0.03 Perlite 2.6-3.8 Redispersed latex powder 0.015-0.04 Ether of starch 0,082-0,12

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