RU2075460C1 - Method of preparing binding composition - Google Patents

Abstract

FIELD: manufacture of building materials. SUBSTANCE: invention deals with binding agent for pastes, crack fillers, and protective and ornamental coatings for building materials. To prepare binding composition, first 10-15% of liquid glass based on its total amount is mixed with alkali metal phosphate aqueous solution and a surfactant for 0.5-2.5 h, whereupon 1/3 of resultant mixture is dispersed with remaining portion of liquid glass, dye, and filler, and 2/3 of this mixture is mixed with a latex for 15-30 min. Further the both parts are combined and agitated for 30-40 min to produce binding composition containing (in weight parts): liquid glass, 100; 2% alkali metal phosphate aqueous solution, 15-35; surfactant, 1.5-2.5; dyes, 3-50; fillers, 30-180; latex, 10-20; water, 6-15. Characteristics: viscosity 39 sec; bending strength of 50-mcm composition layer 1 kg/sq.cm, impact strength 50 kg/sq.cm, spreadable life 90 days, moisture resistance (thickness 50 mcm) 24 h, moisture absorption 0.3%, limiting wetting angle up to 10 deg, adhesion up to 4 MPa, cold resistance 15 cycles. EFFECT: improved quality. 2 cl, 1 tbl

Description

 The invention relates to construction, and in particular to a method for preparing a cementitious composition, which can be used in the manufacture of putties, putties, protective and decorative coatings for building materials.

Known composition, including, by weight alkaline silicate 100, binder 10 100, converter 2 30, foam stabilizer 0.1 50, siliceous dust 5 70, synthetic resin or rubber 3 50 [1]
Closest to the claimed method is a method of obtaining a cementitious composition by displacement of polyoxyethylene ether of alkyl phenol, carboxymethyl cellulose, Na polyphosphate, pentachlorophenolate Na and water and displacement of the resulting aqueous solution with TiO ₂ , chalk, kaolin, talc and ultramarine followed by dispersion in a bead mill surfactant and urea-melamine-formaldehyde resin in the mixer for 1 h until a homogeneous mass. Phosphoric acid is introduced into the resulting mass, mixed thoroughly for 5-10 minutes and liquid glass is introduced.

The prepared composition is diluted with water [2]
The resulting composition has a low viability, a high contact angle, and the coating based on it has insufficient adhesion.

 The technical result, the achievement of which the alleged invention provides, is to increase the viability of the cementitious composition, reduce its contact angle, and also increase the adhesion of the coating based on it.

 The specified technical result is achieved by the fact that in the method of preparation of the cementitious composition, which consists in mixing liquid glass, latex, alkali metal phosphate, pigment, filler and water, initially 10-15% of the total amount of liquid glass is mixed for 0.5 2.5 h with an aqueous solution of alkali metal phosphate and a surfactant, after which 1/3 of the resulting mixture is dispersed with the rest of the water glass, pigment and filler, and 2/3 of this mixture is mixed with latex for 15 30 minutes, and mix Both parts for 30 to 40 minutes.

 The ratio of components is, wt. h

Liquid glass 100
Alkali metal phosphate (dry matter) 0.4 1.0
Surfactant 1.5 2.5
Pigment 3.0 50.0
Filler 30.0 180
Latex 10.0 20.0
Water 6 15
Characteristics of the components used:
liquid glass,
sodium liquid glass (module 3.1; density 1.2 g / cm ³ ) (GOST 13078-81),
potassium liquid glass (module 3.5, density 1.12), (TU 6-18-204-74),
potassium sodium liquid glass (module 3.2; density 1.2 g / cm ³ ).

Latexes
styrene-butadiene latex (GOST 38.103550-84),
styrene acrylic latex,
divinyl acrylic latex (GOST 13522-78) and others.

Surfactants
polyoxyethylene ethers of alkyl phenols OP-7, OP-10 (GOST 8433-81),
TU 10-RSFSR-506-80-89 sodium liquid soap,
sulfanol NP-3 (STU 110-218-58-04),
sulfonate
carboxymethyl cellulose (OST 6-05-385-80),
polyacrylic acid sodium salt,
hydroxyethyl cellulose (TU 605-221-317-75),
Alkali metal phosphates
trisodium phosphate Na (GOST 13493-86).

polyphosphate K (GOST 20291-80),
Na hexametaphosphate (GOST 20291-80) and others.

Pigments
titanium dioxide (GOST 9808-84),
yellow iron oxide pigment (GOST 18172-80),
red minium iron (GOST 8135-74),
chromium oxide (GOST 2912-79),
lithopone (GOST 907-72) and others.

Fillers
enriched natural chalk (GOST 12085-88),
muscovite mica (TU 21-25-298-88),
ground talc (GOST 19729-74),
enriched kaolin (GOST 21285-75) and others.

 Below are examples of the proposed method.

 Example 1

 58 g of water, 0.4 g of sodium trisodium phosphate, 0.8 g of sodium liquid glass, 0.4 g of sodium sulfonate, 0.4 g of carboxymethyl cellulose are loaded into a stirrer. Dissolve within 1 hour. Then the resulting solution is treated with stirring 15 g (15%) of sodium liquid glass for 30 minutes. After that, 1/3 of the obtained colloidal solution (25 g) was combined with the remaining part of sodium liquid glass (85 g), 40 g of titanium dioxide, 130 g of chalk, 32 g of talc, 12 g of kaolin, 6 g of mica and dispersed in a bead mill. 2/3 of the colloidal solution (50 g) is mixed with 10 g of styrene-butadiene latex for 15 minutes. The resulting mixture was combined with stirring for 30 minutes.

 Example 2

 27 g of water, 0.7 g of potassium polyphosphate, 0.2 g of sulfanol, 2 g of sodium salt of polyacrylic acid are loaded into a stirrer, dissolved in 1 hour. Then, the resulting solution is treated with stirring 10 g (10%) of potassium-sodium liquid glass for 2.5 hours. After that, 1/3 of the obtained colloidal solution (17 g) is combined with the remaining part of potassium-sodium liquid glass (90 g), 1 g of yellow iron oxide pigment, 1.5 g of red iron oxide, 0.5 g of chromium oxide, 100 g of chalk, 50 g of talc, 15 g of mica and dispersed in a bead mill. 2/3 of the colloidal solution (34 g) is mixed with 17 g of styrene acrylic latex for 20 minutes. The mixture obtained above is combined with stirring for 40 minutes.

 Example 3

 30 g of water, 1 g of sodium hexametaphosphate, 1 g of polyoxyethylene ether of alkylphenol OP-7, 1 g of hydroxyethyl cellulose are loaded into a stirrer. Dissolve within 1 hour. Then the resulting solution is treated with stirring 12 g (12%) of potassium water glass for 1 hour. After this, 1/3 of the obtained colloidal solution (16 g) is combined with the remaining part of potassium water glass (88 g), 50 g of lithopone, 20 g of chalk, 10 g of talc, 5 g of mica and dispersed in a bead mill. 2/3 of the colloidal solution (32 g) is mixed with 20 g of divinyl acrylic latex for 30 minutes. The resulting mixture was combined with stirring for 35 minutes.

 The table shows the test results of the composition obtained by the proposed method, and the composition obtained by the prototype method.

 The viability of the composition is determined at a primary viscosity of 18 20 s using a B3 4 viscometer and after the specified days after reaching a viscosity of B3 4 50 s.

 The moisture resistance of the coating is determined as follows.

 The composition is applied to a concrete substrate d 8 cm and a thickness of 6 cm on both sides and tested for water resistance on the 7th day after application. Visually determine the state of the substrate and the exposure time of the coating until a rash, blisters, etc.

 To measure the wetting angle, a drop of the test liquid is applied using a glass capillary or a microsyringe onto a plate mounted on a stage. Next, adjust the magnifier and the stage so that the drop image is clearly visible in the eyepiece and that the intersection of the “cross” of the eyepiece coincides with the contact point of the three phases (solid surface-liquid-air). The contact angle can be measured both on the left and on the right side of the drop.

 The adhesion of the coating to the metal substrate is determined by the method of "shear". Two plates after coating are folded with the painted side and placed under the load for seven days. Then the sample is tested for shear under a press.

The adhesion is calculated by the formula
A = P / S,
where A is adhesion to a metal substrate;
P is the force developed by the press during shear of the plate, H;
S is the area of resistance of the plates, cm ² .

Claims (2)

 1. The method of preparation of the astringent composition, which consists in mixing water glass, latex, alkali metal phosphate, filler and water, characterized in that at first 10 15% of the total amount of water glass is mixed for 0.5 2.5 hours with an aqueous solution of phosphate alkali metal and surfactant, after which 1/3 of the mixture is dispersed with the rest of the liquid glass, pigment and filler, and 2/3 of this mixture is mixed with latex for 15 30 minutes and the two parts are mixed together for 30 40 min  2. The method according to p. 1, characterized in that the ratio of the components is, parts by weight Liquid glass 100
Alkali metal phosphate (dry matter) 0.4 1.0
Surfactant 1.5 2.5
Pigment 3.0 50.0
Filler 30.0 180.0
Latex 10.0 20.0
Water 6.0 15.0e

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