RU2358931C2 - Composite high-strength gypsum material and method for its production - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: composite high-strength gypsum material is made of composition that includes the following components, wt %: gypsum binder - 31.5-78.5, calcium hydroxide - 0.09-0.28, potassium polymethyl siliconate - 0.32-1.50, sodium polycarboxylate - 0.30-1.53, sodium tripolyphosphate - 0.012-0.16, hydrazide of isonicotinic acid - 0.002-0.016, siliceous filler - 0-55.85, water - the rest. Method for production of composite high-strength gypsum material includes separate preparation of mixtures of aqueous solutions of calcium hydroxide and potassium polymethyl siliconate and mixture of aqueous solutions of sodium polycarboxylate, isonicotinic acid hydrazide and sodium tripolyphosphate, further combination of produced mixtures during mixing and introduction of gypsum binder into combined mixture in process of mixing to produce homogeneous suspension. Siliceous filler is added into produced suspension, and its final mixing is carried out to prepare homogeneous composition.

EFFECT: increased strength, water resistance and durability of composite materials.

3 cl, 20 ex, 2 tbl

Description

The invention relates to the production of a composite material based on a gypsum component, which can be used in the manufacture of building products (facade architectural and artistic products, wall blocks, bricks, putties, plaster compositions, gypsum boards, gypsum boards, etc.). In addition, it should be especially noted the possibility of using the proposed material for medical purposes.

Gypsum building parts are notable for their low mechanical strength and water resistance, therefore existing technologies for producing gypsum materials are mainly aimed at improving these properties.

From SU 563382, 06/30/1977, a composition is known for block models of structures and rocky foundations, including lime water, gypsum, sand and water, with the aim of ensuring uniform contact between the blocks, preventing water absorption from the materials of the blocks and obtaining the required similar conditions the shear characteristics of the joints and the ratio of their compressive and tensile strengths, it contains gypsum as semi-aquatic gypsum in the following ratio of components, wt.%:

Boiling lime 2.9-5.5 Gypsum 6.7-8.2 Sand 75.3-81.2 Water 8.7-11.0

The specified composition is obtained at room temperature (18-22 ° C) in the following sequence.

First, sand is mixed with lime-boiling water, gypsum is mixed with water, and then the resulting gypsum solution and the lime-sand mixture are thoroughly mixed. The time of manufacture and placement of the substance is limited by the hydration time of the gypsum.

The blocks of each tier are concreted in rows along the height of the model. In each row, at first one block is concreted, and then intermediate blocks are spreaded. The substance is stacked with tamping layers.

Varying the tensile strength of the joints and shear characteristics is achieved by using the smooth surface of previously laid blocks, giving it a certain roughness, rubbing or coating with a thin layer of lubricant - an aqueous suspension of powdery materials, such as ground limestone, etc.

A composite material is known consisting of activated wet phosphogypsum and an additive in the form of calcium sulfate α-hemihydrate, which is obtained by grinding phosphogypsum with a moisture content of up to 30% in a ball mill, mixed with calcium sulfate hemihydrate and then various products are manufactured by pressing (Terekhov V. A., Varlamov VN and others. Artificial gypsum stone from activated phosphogypsum. Building materials. 1985, No. 2).

Another composite material is known, including a gypsum binder and an additive. Silica-containing additives consisting of sand and mineral wool production waste are used as additives — kings, and wet phosphogypsum as a gypsum binder. The ratio of components in the mixture is the following, wt.%:

Sand 15-20 Kings 5-15 Phosphogypsum rest

The mixture is prepared as follows: all components are metered and poured into a ball mill. Grinding is carried out depending on the initial moisture content of phosphogypsum. Products obtained from this mixture are dried at a temperature of 50-55 ° C for 3-4 hours.

The use of this mixture allows to obtain sufficiently durable products, but the moisture resistance of the products is low due to the use of phosphogypsum. In addition, the range of application of this composite material is extremely small, because not environmentally friendly raw materials are used, namely phosphogypsum (RF patent 2052416, С04В 28/14, 1996).

Another method for producing composite material is also known, including crushing gypsum stone, calcining it at a temperature of 600-750 ° C to obtain a gypsum binder — anhydrite, drying the additive — sodium sulfate, dry mixing the resulting binder with the additive, and grinding them together (Volzhensky A. B. Gypsum binders and products. - M: Stroyizdat, p.69-70).

However, this method requires an additional operation - drying of sodium sulfate, because it is sufficiently hygroscopic and even the introduction of dried sodium sulfate into the composite material can cause a dispersion in the moisture content of the finished product, which reduces the quality of the finished product.

From RU 2203235, 04/20/2004, a raw material mixture is known for producing a water-resistant building material, including two-water secondary gypsum, lime and water, which as lime contains slaked lime in the form of a saturated solution and additionally slag Portland cement in the following ratio, wt.%: Two-water secondary gypsum 65-75, slag Portland cement 10.5-13.5, the specified slaked lime (dry) 0.0135-0.019, water - the rest.

The disadvantage of bonded gypsum mortar, gypsum flooring and gypsum coatings is, however, the low water resistance of these systems. The use of gypsum at present for external coatings, for example, as plaster, is still an insoluble problem.

It is known that imparting water-repellent properties to gypsum is achieved by the action of special polysiloxanes, which are added in amounts of up to 2 wt.%. But this, however, is disadvantageous, because the addition of polysiloxanes due to their biological indestructibility and their unfavorable eco-balance upon receipt strongly affects the environment. In addition, the quality of such modified gypsum is also not suitable for outdoor use.

German application laid out 3238390, 05/19/1983, presents a dry solution that contains gypsum or cement as an astringent, and then in an amount of 0.05 to 1 volume% (vol.%), Based on the volume of dry solution, the mixture from 60-88% of a mixture of paraffin hydrocarbons with 10-20 carbon atoms and / or glycerol ester, a higher fatty acid or fat, and from 12 to 40% of a surfactant as an emulsifier. The above mixture gave water-repellent properties, as a result of which the mortar showed the best heat-insulating properties and frost resistance.

A gypsum dispersant is known from Japanese Patent Application 82/61648, which contains a condensation product of (alkyl) naphthalene sulfonic acid and formaldehyde, as well as silicon dioxide powder and optionally another oil selected from mineral oils, synthetic lubricants and natural oils. Gypsum is thus well dispersed in water until it is bound to water during conversion. Separation of water from a mixture of water and gypsum, i.e. gypsum slurry, decreases upon binding, and hardened gypsum is obtained of higher quality.

Japanese patent application 79/10974 describes building panels with improved water resistance, which are produced when a relatively large amount of higher fatty acid or its salt is added to a hydraulic material, such as cement or calcined gypsum.

Reinforced gypsum concrete is known from the Belgian patent application 873812, which is obtained by thoroughly mixing gypsum and water, while part of the gypsum is replaced by a practically insoluble metal salt of a fatty acid. As a water-repellent agent, calcium, aluminum, barium, lead, magnesium, zinc, copper or nickel salts of stearic acid, oleic acid, palmitic acid or the like are used.

From Japanese Patent Application 82/3751, water-resistant bonded gypsum fittings are known which are produced by reacting a water-repellent agent with hemihydrate of calcium oxide, adding water, molding and heating in an atmosphere of carbon dioxide. This hydrophobic agent was added in an amount of from 0.5 to 12 wt.% To higher fatty acid, such as stearic acid, palmitic acid, oleic acid, coconut oil fatty acids, etc., and its salts with alkali / alkaline earth metals.

Japanese patent application 83/36955 relates to compositions for mortars in which granular blast furnace slag is used in the form of an aggregate characterized by very good stable quality. Such mixtures contain 10 parts by weight of calcium sulfate monohydrate and from 50 to 200 parts by weight of blast furnace slag granulate in the form of an aggregate, from 0.03 to 3 parts by weight of phosphate, from 0.03 to 3 parts by weight of a retarder based on protein and, if essential supplements, among others, a fatty acid salt.

From RU 2246460, 02.20.2005, there is known a gypsum-containing composition for the manufacture of various composite materials, which comprises from 0.1 to 30% of a special fatty chemical additive of various nature with a molecular weight of up to 20,000, based on the total dry mixture.

In the gypsum-containing composition according to the known invention, gypsum as anhydrite or hemihydrate with all occurring chemical modifications (ά- and β-hemihydrate, anhydrite I, II, III) based on natural gypsum, chemically obtained gypsum or gypsum is used as the main component obtained by desulfurization of flue gases. In principle, these hydraulically coupled calcium sulfate-based variants exist both in pure form and in a mixture.

According to the meaning of the present invention, fatty substances are understood to mean fatty acids, fatty alcohols and their derivatives obtained from natural, in particular from vegetable and animal oils.

Based on this, in addition to these fatty mixtures, the corresponding individual substances can also be used.

As examples of saturated fatty acids with 8-26 carbon atoms, preferably from 12 to 22 carbon atoms, mention should be made of: caproic, caprylic, capric, lauric, myristic, palmitic, stearic, arachinic, behenic, cerotinic, pentadecanoic, margaric, tridecanoic and lignoceric acid. As examples of unsaturated fatty acids with 8-26 carbon atoms, preferably from 12 to 22 carbon atoms, mention should be made of: myristinoleic, palmitoleic, oleic, elaidic, petrozelinic, erucic, linoleic, linolenic, arachidonic, clupanodonic, docosahexaenoic, eicosolenta .

From RU 2232733, 07.20.2004, a composite material and a method for its preparation are known. The composite material includes a gypsum binder and an additive, β-hemihydrate or water-soluble calcium sulfate anhydrite is used as a gypsum binder, and natural carbon-containing mineral - shungite with a dispersion of 1 to 200 μm in the following ratio, wt.%: Specified gypsum is used as an additive astringent 50-90, said shungite 10-50. In the method for producing said composite material, including crushing gypsum stone, calcining it at elevated temperatures, and dry mixing the obtained gypsum binder with an additive, calcining it to produce a gypsum binder - β-hemihydrate or water-soluble calcium sulfate anhydrite.

The resulting composite material has protective, biocidal and antiseptic properties while maintaining strength properties.

Increasing the strength of gypsum materials several times is an urgent task of modern building materials science.

In some cases, the manufacture of gypsum products and parts, especially for facade durable structures, is extremely difficult. To achieve this goal (increasing the strength characteristics of the product, its frost resistance, reducing porosity and, therefore, water absorption of the material), various technological methods are used, the main of which is the improvement of the formulation and the use of various organic polymer additives in the technology.

The increase in strength and improvement of other physical and mechanical properties of gypsum products can be achieved by reducing the water demand of the binder and increasing the mobility of gypsum systems. This increases the strength characteristics of gypsum materials, reducing energy costs and accelerating the kinetics of increasing the strength of materials when using natural drying. For low-quality gypsum, for example, Khabezsky, Novomoskovsky gypsum binders, bearing the brand G-5, Peshelansky or Arakchinsky gypsum binders - G-6, the use of plasticizers like C-3 (3-sodium sulfite 6-polymethyl naphthalene) allows you to increase the strength of the material from 4 up to 5 MPa.

From RU 2260572, 09/20/2005, an additive for modifying gypsum binders, mortars and concrete based on them is known, which includes,% by weight: hydraulic binder 50-90, active mineral component 10-45, plasticizing additive 0.1-2 , the regulator of the setting time and hardening of 0.001-1, the stabilizer of 0.001-5. Moreover, as a hydraulic binder, the additive contains Portland cement of any kind, white cement, non-ferrous cement, alumina cement, hydraulic lime or a mixture thereof in any proportion, as an active mineral component - fly ash, ash or buckwheat husks, ashes and slag of thermal power plants, ceramic dust, waste products from brick and other ceramic products, aluminum compounds, fine quartz sand, silica fume, pumice, glass break, silica gel, tuff, diatomite, white soot, aerosil, or any mixture thereof proportions, as a plasticizing additive - a superplasticizer containing compounds based on sulfonated melamine-formaldehyde compounds and / or complexes based on them, compounds based on sulfonated naphthalene formaldehyde compounds or complexes based on them, compounds based on modified lignosulfonates, or compounds based on water-soluble carboxylate polymers, or their mixture in any proportion, as regulators of the setting time and hardening - a moderator of gypsum hardening, as the stabilizer - water-soluble cellulose ether. In this case, one of the following components or semi-aquatic gypsum or anhydrite mixed in any proportion is used as gypsum binders, the dosage of the additive is carried out in an amount of 10-40% of their mass, and the specific surface value is 550-7000 m ² / g.

The technical task of the claimed invention is to increase the strength, water resistance and durability of composite materials and products based on gypsum binder.

The stated technical problem is solved by the claimed group of the invention, which includes composite high-strength gypsum material and the method for its preparation.

So, the stated technical problem is solved in that the composite high-strength gypsum material is made of a composition comprising a gypsum binder, calcium hydroxide, potassium polymethylsiliconate, sodium polycarboxylate, isonicotinic acid hydrazide, sodium tripolyphosphate, water and a silica-containing filler in the following ratio of components in wt.%:

gypsum binder  31.5-78.5 calcium hydroxide  0.09-0.28 potassium polymethylsiliconate  0.32-1.50 sodium polycarboxylate  0.30-1.53 sodium tripolyphosphate  0.012-0.16 isonicotinic acid hydrazide  0.002-0.016 silica filler  0-55.85 water  rest

The technical problem is also solved by the method of producing high-strength gypsum material, including the separate preparation of a mixture of aqueous solutions of calcium hydroxide and potassium polymethylsiliconate and a mixture of aqueous solutions of sodium polycarboxylate, isonicotinic acid hydrazide and sodium tripolyphosphate, the subsequent combination of the obtained mixtures with stirring, the introduction of a gypsum binder into the combined mixture stirring until a homogeneous suspension.

If necessary, a silica-containing filler is added to the resulting suspension and it is finally mixed until a homogeneous composition is obtained.

As a gypsum binder, binders of grades G-4-G-16 are used.

As a silica-containing filler, quartz sand or crushed sandstone, or crushed granite, or crushed ceramic brick are used.

The following examples illustrate the invention, but do not limit it.

Example 1. 190 g of calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were mixed in a mixer beforehand, 210 g of a 10% sodium polycarboxylate solution (containing 21 g of sodium polycarboxylate) was pre-mixed with another 2 g of a 5% solution of isonicotinic acid hydrazide (contains 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (contains 0.5 g of sodium tripolyphosphate).

The solutions were stirred for 2 minutes. Then both solutions were combined and mixed for 3 minutes. 1340 g of a high-strength gypsum binder grade G-16 was loaded into the resulting solution in an amount of 427 g and mixed until homogeneity was obtained, and then 1360 g of quartz sand was added to the resulting suspension with stirring and again mixed until uniform. Then the suspension was poured into the shape of the product, which was hardened and removed from the mold, dried at 50 ° C and tested for strength, water absorption and water resistance according to GOST 23789-79 (softening coefficient). The test results are shown in table.2.

Example 2. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 10 g of potassium polymethylsiliconate solution were pre-mixed in a mixer, 210 g of 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were pre-mixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Then they acted as in example 1.

Example 3. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 15 g of potassium polymethylsiliconate solution were pre-mixed in a mixer, 210 g of 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were pre-mixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Then they acted as in example 1.

Example 4. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 30 g of potassium polymethylsiliconate solution were pre-mixed in a mixer, 210 g of a 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were pre-mixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Then they acted as in example 1.

Example 5. 190 g of a clarified solution of calcium hydroxide (containing 3.8 g of calcium hydroxide) and 20 g of a solution of potassium polymethylsiliconate were pre-mixed in a mixer, 310 g of a 10% sodium polycarboxylate solution (31 g of sodium polycarboxylate contained) were pre-mixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Then they acted as in Example 1, and then 2360 g of silica sand was added to the resulting suspension with stirring and mixed again until smooth. Then they acted as in example 1.

Example 6. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were mixed in a mixer beforehand, 110 g of a 10% sodium polycarboxylate solution (11 g of sodium polycarboxylate contained) were premixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Then they acted as in Example 1, and then 1860 g of silica sand was added to the resulting suspension with stirring and mixed again until smooth. Then they acted as in example 1.

Example 7. 190 g of a clarified solution of calcium hydroxide (containing 3.8 g of calcium hydroxide) and 20 g of a solution of potassium polymethylsiliconate were pre-mixed in a mixer, and 180 g of a 10% sodium polycarboxylate solution (containing 18 g of sodium polycarboxylate) was pre-mixed in another mixer. with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Further, as in example 1. Then, the suspension was poured into the shape of the product, which was hardened and removed from the mold, dried at 30 ° C and tested as in example 1.

Example 8. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were mixed in a mixer beforehand, 210 g of a 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were premixed with 10 g of a 5% solution of isonicotinic acid hydrazide (containing 0.5 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Further, as in example 1.

Example 9. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were pre-mixed in a mixer, 210 g of a 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were pre-mixed with 6 g of a 5% solution of isonicotinic acid hydrazide (containing 0.3 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Further, as in example 1.

Example 10. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were mixed in a mixer beforehand, 210 g of a 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were pre-mixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 50 g of a 10% solution of sodium tripolyphosphate (containing 5 g of sodium tripolyphosphate). Further, as in example 1.

Example 11. In the mixer, 190 g of clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were mixed beforehand, in another mixer 210 g of 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were premixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 10 g of a 10% solution of sodium tripolyphosphate (containing 1 g of sodium tripolyphosphate). Further, as in example 1. To the resulting solution in an amount of 432 g was added a gypsum binder and filler, as in example 1. Next, as in example 1.

Example 12. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were pre-mixed in a mixer, 210 g of a 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were pre-mixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate).

The solutions were stirred for 1 min. Then both solutions were combined and mixed for 2 minutes. In the resulting solution in an amount of 427 g, 1340 g of high-strength gypsum binder grade G-16 was loaded and mixed until homogeneous, and then 1360 g of marble sand was added to the resulting suspension with stirring and mixed again until uniform. Further, as in example 7.

Example 13. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were pre-mixed in a mixer, 210 g of a 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were pre-mixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Next, as in example 12, and then to the resulting suspension, 1060 g of dolomite sand was added with stirring and mixed again until smooth. Further, as in example 1.

Example 14. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were mixed in a mixer beforehand, 210 g of a 10% sodium polycarboxylate solution (containing 21 g of sodium polycarboxylate) was pre-mixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Further, as in example 7, and then to the resulting suspension, 1060 g of ground ceramic bricks were added with stirring, again mixed until homogeneous. Further, as in example 1.

Example 15. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were mixed in a mixer beforehand, 210 g of a 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were premixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Next, as in example 1, and then 960 g of ground granite was added to the resulting suspension with stirring and mixed again until smooth. Further, as in example 1.

Example 16. 190 g of a clarified calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were mixed in a mixer beforehand, 210 g of a 10% sodium polycarboxylate solution (21 g of sodium polycarboxylate contained) were premixed with 2 g of a 5% solution of isonicotinic acid hydrazide (containing 0.1 g of hydrazide), 5 g of a 10% solution of sodium tripolyphosphate (containing 0.5 g of sodium tripolyphosphate). Further, as in example 1, and then into the resulting suspension, 1000 g of ground sandstone was added with stirring and mixed again until smooth. Further, as in example 1.

Example 17. 190 g of calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsilicate solution were pre-mixed in a mixer, 210 g of 10% sodium polycarboxylate solution (containing 21 g of sodium polycarboxylate) was pre-mixed with another 2 g of a 5% solution of isonicotinic acid hydrazide (contains 0.1 g of hydrazide), 50 g of a 10% solution of sodium tripolyphosphate (contains 5 g of sodium tripolyphosphate). Further, as in example 7. In the resulting solution in an amount of 472 g was loaded 900 g of building gypsum binder grade G-6 and mixed until uniform.

Example 18. 190 g of calcium hydroxide solution (containing 3.8 g of calcium hydroxide) and 20 g of potassium polymethylsiliconate solution were pre-mixed in a mixer, 210 g of 10% sodium polycarboxylate solution (containing 21 g of sodium polycarboxylate) was pre-mixed with another 2 g of a 5% solution of isonicotinic acid hydrazide (contains 0.1 g of hydrazide), 50 g of a 10% solution of sodium tripolyphosphate (contains 5 g of sodium tripolyphosphate). The solutions were stirred for 2 minutes. Then both solutions were combined and mixed for 3 minutes. 1700 g of high-strength gypsum binder grade G-16 was loaded into the resulting solution in an amount of 472 g and mixed until uniform. Further, as in example 1.

Example 19. The mixer was loaded with 480 ml of water, into which 1000 g of high-strength gypsum binder grade G-16 was supplied, then they were supplied as in example 1.

Example 20. The mixer was loaded with 600 ml of water, into which 1000 g of a building gypsum binder of grade G-6 was supplied, then they were supplied as in example 1.

The test results of samples of articles of composite material according to the invention are presented in table 2.

Claims (3)

1. Composite high-strength gypsum material made of a composition comprising a gypsum binder, calcium hydroxide, potassium polymethylsiliconate, sodium polycarboxylate, isonicotinic acid hydrazide, sodium tripolyphosphate, water and a silica-containing filler in the following ratio, wt.%:
gypsum binder 31.5-78.5 calcium hydroxide 0.09-0.28 potassium polymethylsiliconate 0.32-1.50 sodium polycarboxylate 0.30-1.53 sodium tripolyphosphate 0.012-0.16 isonicotinic acid hydrazide 0.002-0.016 silica filler 0-55.85 water rest 2. A method of obtaining a composite high-strength gypsum material according to claim 1, comprising separately preparing a mixture of aqueous solutions of calcium hydroxide and potassium polymethylsiliconate and a mixture of aqueous solutions of sodium polycarboxylate, isonicotinic acid hydrazide and sodium tripolyphosphate, subsequent combination of the obtained mixtures with stirring and the introduction of gypsum into the combined mixture binder with stirring until a homogeneous suspension. 3. The method according to claim 2, characterized in that a silica-containing filler is added to the resulting suspension and it is finally mixed until a homogeneous composition is obtained.