RU2237034C1 - Dry plaster mix - Google Patents

Abstract

FIELD: manufacture of building materials.

SUBSTANCE: dry plaster mix suitable for finishing operations contains, wt %: gypsum 96.0-97.3, perlite 1.7-2.35, lime 0.85-1.4, retardant 0.045-0.08, cellulose ether 0.012-0.145, and re-dispersed latex powder 0.014-0.02.

EFFECT: improved adhesive characteristics and prolonged cementation time.

2 tbl

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 from 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, alkaline effluent additive for the production of caprolactam based on dicarboxylic acids ShchSPK 0.2-0.8, multidentate chelating ligand 0.03-0.15, trisodium phosphate 0.05-0.1, water - 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 of the analogues is a dry gypsum plaster mix, which contains gypsum binder, sand from expanded vermiculite, lime, a moderator - citric acid, ether cellulose in the form of carboxymethyl cellulose, an air-entraining additive - sulfonol, a superplasticizer (see, for example, KZ No. 115.02, opubl. .2002, 4 pp.).

The present invention solves the problem of creating a dry stucco mixture, providing increased adhesion and having an extended setting time.

To achieve the technical result, a dry stucco mixture, including gypsum, lime, a moderator, etherocellulose, additionally contains perlite and redispersed latex powder in the following ratio, wt.%:

Gypsum 96.0-97.3

Perlite 1.7-2.35

Lime 0.85-1.4

Retarder 0.045-0.08

Ether cellulose 0.12-0.145

Redispersed latex powder 0.014-0.02

Dry plaster mix is obtained by mixing gypsum, perlite and lime with special additives. A retarder, for example, “Tartaric acid”, glycerin or citric acid, is used as a retardant. Expanded perlite is used as perlite, 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 preparation, application and grouting) is 60 ± 10 min 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.

The use of dry building mixtures allows you to:

- increase labor productivity;

- reduce material consumption, significantly improve the quality of construction work.

For experimental verification of the claimed composition, mixtures were prepared, 2 of which (2 and 3) showed optimal results (see tables 1, 2). The composition of the dry mixture with the invention is shown in examples 2-3, table 1, as well as examples of 1.4 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 tables it follows that an increase or decrease in the amount of retarder, etherocellulose and redispersed latex powder leads to a reduction in the setting time, and the adhesive ability deteriorates.

An increase or decrease in the content of gypsum and lime in the composition leads to a deterioration in the technological parameters of coatings in terms of their ability to be applied to multidirectional surfaces, to a deterioration in the performance of coatings during operation, and to a deterioration in the performance of 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 the invention, a composition is obtained that provides increased adhesion having an extended setting time.

Claims (1)

Dry stucco mixture, including gypsum, lime, moderator, etirocellulose, characterized in that it additionally contains perlite and redispersed latex powder in the following ratio, wt.%: Gypsum 96-97.3 Lime 0.85-1.4 Retarder 0.045-0.08 Ether cellulose 0.12-0.145 Perlite 1.7-2.35 Redispersed latex  powder 0.014-0.02

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