RU2669317C1 - Finishing composition - Google Patents

Abstract

FIELD: construction.SUBSTANCE: invention relates to the field of building materials, namely to the composition for finishing, and can be used as a filler for finishing external facades and internal walls of buildings. Composition for decoration, used as a filler for finishing external facades and internal walls of buildings, including a binder, mineral filler – microcalcite, contains as a binder the modified liquid glass obtained by mixing for 30 minutes of sodium liquid glass with a module of not less than 2.7 and lithium hydroxide in an amount of 0.5–1 % by weight of the liquid glass, followed by the addition of a silicic acid sol in an amount of 3–15 % by weight of the liquid glass, with the following component ratio, by weight: modified liquid glass 38–43; microcalcite 57–63.EFFECT: acceleration of curing, increase of water resistance of the finishing layer.1 cl, 7 tbl

Description

The invention relates to compositions used for finishing concrete and plaster surfaces.

Known compositions containing lime fluff, waste from the production of silicate brick, milled to a specific surface of 3500-4000 cm ² / g, additives, water [1].

The closest in technical essence and the achieved result is a composition including liquid glass, styrene acrylic emulsion, chalk, plasticizer additive [2].

The disadvantage of these compositions are low water resistance, low adhesion to substrates of various materials.

The objective of the invention is to remedy these disadvantages.

The problem is solved in that the composition for finishing, including a binder, a mineral filler, contains microcalcite as a mineral filler, and a modified liquid glass obtained as a binder, obtained by mixing sodium liquid glass with a module of at least 2.7 and lithium hydroxide for 30 minutes in an amount of 0.5-1% by weight of liquid glass, followed by the introduction of a sol of silicic acid in an amount of 3-15% by weight of liquid glass in the following ratio of components, mass. %:

modified liquid glass 38-43

microcalcite 57-62

The binder and composition are prepared as follows. At the first stage, anhydrous lithium hydroxide is introduced in portions into an aqueous solution of sodium silicate with a density of 1.46 g / cm ³ . Stirring of each portion is carried out until the lithium hydroxide particles are completely dissolved (disappeared), then a silica sol is introduced in portions and after mixing a modified binder is obtained.

At the last stage, microcalcite is introduced into the modified binder. The composition is stored in sealed containers.

To prepare the composition for decoration used the following materials:

Sodium water glass for construction, the properties are presented in table 1 [3].

Nanosil 20 was used as the silicic acid sol; the properties are shown in table 2.

Microcalcite (GOST R 56775-2015 Microcalcite for building materials. Technical conditions) [4].

In the work we used microcalcite of the grade KM 100, the properties are shown in table 3

Specific examples of formulations are shown in table 4.

The following methods were used to study the properties of the presented compositions.

Determination of adhesion of coatings to a substrate. The adhesion strength of coatings was determined by the method of lattice cuts and the method of separation of washers (normal separation) [5].

The method of lattice cuts is to assess the degree of adhesion of the paint film to the substrate by the number of cells dropped from the substrate when cutting the film.

At least five parallel incisions to the substrate at a distance of 1 mm from each other were made on the surface of the coating with a razor blade in a line. The same number of similar incisions were made perpendicularly to the first. After applying the squares, the film was cleaned of exfoliated pieces of film. Adhesion was evaluated by the condition of incisions on the coating and expressed in points (table 5).

The result was taken as the average value of the score obtained when testing at least two samples and on three surface areas of each sample.

The method of separation of the washers is based on the determination of the force of peeling of the washers from the surface by separation. Adhesion strength was calculated by the formula:

where: P is the contact area of the washer with the coating, cm ² ;

F - separation force, kg

Drying time was determined in accordance with GOST 19007-73 * [6].

Assessment of the degree of drying was carried out on a seven-point scale. The basis of the method is the ability of the coating to hold paper or glass balls on its surface, depending on the degree of cure, which is to determine the time during which the finishing layer turns into a layer with the desired degree of drying (table 6).

Assessment of water resistance of the finishing layer. The test composition was applied to two plates measuring 70 × 150 mm. After drying at a temperature of 20 ° C, vertically suspended coated plates were immersed at 2/3 of the height in a glass bath with distilled water. Previously, the ends along the perimeter of the plates were coated with paraffin so that water did not get through the end of the plate into the coating. After exposure to water at a temperature of 20 ± 2 ° C for 24 hours, the plates were removed from the water, dried with filter paper, kept in air for 1-2 hours and the appearance and color of the coating were evaluated [7]

The test results of the compositions for decoration are shown in table 7.

LITERATURE

1. Putty. Pat. RU 2281263 Ros. Federation: IPC С04В 28/18 V.I. Loganin; Applicant and patent holder of the Penza State University of Architecture and Construction - No. 2281263; declared 04/16/04; publ. 08/10/06.

2. Putty. Pat. 2402500, Ros. Federation: IPC С04В 26/04. Loganina V.I., Petukhova N.A., Kislitsyna S.N .; Applicant and patent holder of the Penza State University of Architecture and Construction - No. 2402500; declared 04/09/07; publ. 10/27/10.

3. GOST 13078-81 GLASS SODIUM LIQUID TECHNICAL CONDITIONS [Text], is approved and entered into force by the Resolution of the USSR State Committee for Standards dated 04.29.81 No. 1868; Moscow: USSR STATE COMMITTEE ON STANDARDS, 1982.

4. GOST R 56775-2015 Microcalcite for building materials. Specifications [Text] .- introduced 01.06.2016 Federal Agency for Technical Regulation and Metrology Federal State Unitary Enterprise - Moscow "Standardinform", 2016.

5. GOST 15140-78 PAINT MATERIALS Methods for determining adhesion [Text]. - Enter. 01/01/79 developed and introduced by the Ministry of the Chemical Industry approved and put into effect by Resolution of the State Committee of Standards of the Council of Ministers of the USSR dated 05/18/78 No. 1336 Moscow, IPK Standards Publishing House.

6. GOST 19007-73. MATERIALS PAINT AND VARNISHES

Method for determining the time and degree of drying Technical conditions [Text]. - Enter. 07/01/1974 APPROVED AND IMPLEMENTED BY Decision of the State Committee of Standards of the Council of Ministers of the USSR of July 20, 1973 No. 1789.

7. GOST 9.403-80 (ST SEV 5260-85) Unified system of protection against corrosion and aging (ESZKS). Varnish-and-paint coatings. Test methods for resistance to static effects of liquids (with Change N 1) [Text] - introduced. 1982-01-01 Decree of the USSR State Committee for Standards of December 30, 1980 N 6186-M .: IPK Standards Publishing House, 2002.

Claims (3)

Composition for decoration, used as a putty to finish the external facades and internal walls of buildings, including a binder, mineral filler, characterized in that it contains a modified liquid glass as a binder, obtained by mixing sodium liquid glass with a module of at least 2 for 30 minutes , 7 and lithium hydroxide in an amount of 0.5-1% by weight of water glass, followed by the introduction of a silica sol in an amount of 3-15% by weight of water glass, in the following ratio, wt.%: modified liquid glass 38-43 microcalcite 57-63