RU2448072C2 - Composition to finish walls of buildings - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: composition to finish walls of buildings contains the following components in wt %: styrene acrylic emulsion Akratam AS 01.1 50.1-55.3, filler representing a mixture of sand and clay, 23.8-29.5, sol of silicic acid 2.8-3.7, surfactant OP-4 0.7-1.4, water 14.3-18.4.

EFFECT: faster hardening of the composition, increased strength of adhesion and hydrophobic properties of coatings based on the composition.

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Description

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

Known compositions containing cement, lime dough, animal glue, perlite sand, water (AS 664945, C04B 13/08, 1977).

The closest in technical essence and the achieved result is a composition containing a polyvinyl acetate emulsion, pulverized marshalite, titanium dioxide, lithopone, sodium pentachlorophenolate, water (P.N. Klochanov, A.B.Surzhaneko, I.Sh. Eidinov. Prescription and technological reference for finishing works. - M.: Stroyizdat, 1973, P.103).

The objective of the invention is to accelerate the curing of the composition, increasing the adhesion strength and hydrophobic properties of coatings based on the composition, eliminating these disadvantages.

The problem is solved in that the composition for decoration, including Akratam AS 01.1 styrene-acrylic emulsion, a filler, a silica-containing additive, a surfactant additive, water, contains an OP-4 additive as a surfactant additive, a sand and clay mixture as a filler, and a silica-containing additive as a filler silica sol in the following ratio of components, wt.%:

styrene acrylic emulsion Akratam AS 01.1 50.1-55.3 surfactant additive 0.7-1.4 filler 23.8-29.5 silica-containing additive 2.8-3.7 water 14.3-18.4

The filler is a mixture of sand and clay having a red-brown color. The granulometric composition of the filler, determined by the Rutkovsky method, is as follows (% by volume): clay particles - 11, sand - 77, dusty - 12. Chemical composition of sand is the following, wt.%: SiO ₂ - 89.34-95.48; Al ₂ O ₃ - 2.45-5.06; Fe ₂ O ₃ - 0.11-0.39; p.p.p. - 0.32-1.10. The pigment content in the sand is 97 kg / m ³ .

Additive OP-4 (TU 6-02-997-90) is a transparent, mobile, oily brown liquid without precipitate, readily soluble in mineral oils, ethanol and benzene. Belongs to the class of nonionic surfactants, in soft water forms a stable emulsion. Emulsifier OP-4 is a product of the interaction of alkyl phenols with ethylene oxide.

The introduction of a filler in a mixture with an OP-4 additive provides the preparation of an organomineral additive by adsorption of a surfactant additive on the surface of clay particles contained in a colored filler. The resulting organoclay regulates the rheological, technological properties of the composition for decoration.

The silica-containing additive is a silica sol. The additive is prepared as follows. A solution of sodium liquid glass Na ₂ SiO ₃ with a density of 1.46 g / cm ³ according to GOST 13078-81 is diluted with water, obtaining a 6% solution of Na ₂ SiO ₃ . The resulting liquid glass solution was passed through a cation exchange column to obtain a 4% sol of silicic acid H ₄ SiO ₄ with a pH of 4.0-5.0.

Styrene acrylic emulsion Akratam AS 01.1 (TU 2241-267-05800142-2006) is a copolymer of styrene, butyl acrylate and acrylic acid obtained by emulsion polymerization. In appearance it is a milky white liquid without mechanical impurities. The properties of the emulsion Akratam AS 01.1 are shown in table 1.

Table 1 The name of indicators Norm Mass fraction of non-volatiles,%, 50 ± 1 Mass fraction of residual monomers,%, no more 0.05 Dynamic viscosity at a temperature of 25 ° C, Pa · s, no more 0.7-1.5 The activity indicator of hydrogen ions, units pH 7.5-8.5 Density, g / cm ³ 1,04 Average particle size, microns, no more 0.1 Minimum film forming temperature, ° C +20

The preparation of the composition is as follows. Water and a surfactant additive are loaded into a mixer of any type, mixed, after which a filler is introduced and thoroughly mixed for 10 minutes, after which a silica-containing additive is added. Again mixed, add styrene acrylic emulsion Akratam AS 01.1, and then mixed again.

Specific examples of the compositions and their properties are given in tables 2, 3.

table 2 Name of ingredients Compositions, wt.% I II III IV V prototype Styrene acrylic emulsion 50.1 53.9 55.3 57 49 Additive surfactant (OP-4) 1.4 0.7 1,0 0.6 1,5 Filler (a mixture of sand and clay) 29.5 23.8 25.7 21 thirty Silica-containing additive (silica sol) 2,8 3.2 3,7 4.1 2.2 Water 16,2 18,4 14.3 17.3 17.3 14.8 PVA emulsion - - - - - 27 Marshalite Dusty - - - - - 27 Titanium dioxide - - - - - 12 a piece of chalk - - - - - 9 Pentachlorophenolate - - - - - sodium 0.2 Lithopone - - - - - 10

Table 3 The name of indicators The compositions of the examples I II III IV V prototype Shrinkage, cracks No No No No No No Drying time, min: to degree 3 twenty 22 eighteen eighteen 35 fifty to degree 5 45 fifty 40 45 65 120 Adhesion Strength, MPa 1,6 1,5 1,6 0.8 0.9 1,1 Wetting angle, deg 89 87 89 65 56 49

Claims (1)

Composition for wall decoration of buildings, including Akratam AS 01.1 styrene-acrylic emulsion, filler, silica-containing additive, surfactant additive, water, characterized in that it contains OP-4 additive as a surfactant additive, sand and clay as a filler, and as a silica-containing additive, a silica sol in the following ratio of components, wt.%:
styrene acrylic emulsion Akratam AS 01.1 50.1-55.3 surfactant additive 0.7-1.4 filler 23.8-29.5 silica-containing additive 2.8-3.7 water 14.3-18.4