CN113292310A - Gypsum-based heat-insulating slurry and preparation method thereof - Google Patents
Gypsum-based heat-insulating slurry and preparation method thereof Download PDFInfo
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- CN113292310A CN113292310A CN202110693577.5A CN202110693577A CN113292310A CN 113292310 A CN113292310 A CN 113292310A CN 202110693577 A CN202110693577 A CN 202110693577A CN 113292310 A CN113292310 A CN 113292310A
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- gypsum
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- expanded perlite
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- 239000010440 gypsum Substances 0.000 title claims abstract description 69
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 69
- 239000002002 slurry Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000007613 slurry method Methods 0.000 title description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000010451 perlite Substances 0.000 claims abstract description 51
- 235000019362 perlite Nutrition 0.000 claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000002893 slag Substances 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 39
- 239000002131 composite material Substances 0.000 claims abstract description 30
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 238000009413 insulation Methods 0.000 claims abstract description 18
- 239000002562 thickening agent Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 30
- 229910021487 silica fume Inorganic materials 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 12
- -1 carboxypropyl Chemical group 0.000 claims description 10
- 229920002678 cellulose Polymers 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 6
- 235000010980 cellulose Nutrition 0.000 claims description 6
- 239000001923 methylcellulose Substances 0.000 claims description 6
- 235000010981 methylcellulose Nutrition 0.000 claims description 6
- 239000001509 sodium citrate Substances 0.000 claims description 6
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 6
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 6
- 229920000609 methyl cellulose Polymers 0.000 claims description 5
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 4
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 4
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 4
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 235000011083 sodium citrates Nutrition 0.000 claims description 2
- 230000002940 repellent Effects 0.000 claims 2
- 239000005871 repellent Substances 0.000 claims 2
- 239000004570 mortar (masonry) Substances 0.000 abstract description 5
- 239000004566 building material Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 239000011810 insulating material Substances 0.000 description 9
- 239000004793 Polystyrene Substances 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 8
- 229920002223 polystyrene Polymers 0.000 description 8
- 239000008187 granular material Substances 0.000 description 6
- 229920002635 polyurethane Polymers 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000013329 compounding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011468 face brick Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B30/00—Compositions for artificial stone, not containing binders
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/14—Minerals of vulcanic origin
- C04B14/18—Perlite
- C04B14/185—Perlite expanded
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention belongs to the field of building materials, and particularly discloses gypsum-based heat-insulating slurry and a preparation method thereof, wherein the gypsum-based heat-insulating slurry comprises the following raw materials per cubic meter: 60-90kg of hydrophobic modified expanded perlite, 350kg of gypsum-steel slag composite gel, 1.5-5kg of water reducing agent, 0.5-5kg of retarder, 0.5-6kg of waterproof agent, 1-5kg of thickening agent and 200kg of water. The gypsum-based heat-insulating slurry prepared by the invention has large volume and light weight, can avoid the phenomenon of separation from a wall panel caused by shrinkage of the dried material, ensures that the wall body is tightly attached to the wall panel, and improves the comprehensive bearing capacity of the wall body; meanwhile, the gypsum-based heat-insulating slurry has good volume stability, heat-insulating property and water resistance, and can replace heat-insulating mortar for building heat insulation.
Description
Technical Field
The invention relates to the field of building materials, in particular to gypsum-based heat-insulating slurry and a preparation method thereof.
Background
In recent years, along with the development of economy, the attention degree of China to the field of building energy conservation is gradually improved. In China, the building energy consumption accounts for about 28% of the world energy consumption, together with the production of building materials and the building construction process, the energy consumption accounts for about 50% of the total social energy consumption, and in the building energy consumption, the heating energy consumption accounts for 70% of the total energy consumption. In order to realize energy conservation and consumption reduction of buildings, the current strategy adopted in China is mainly to treat the building maintenance structure so as to reduce the heat transfer coefficient of walls and roofs, and the specific approach is to increase and lay heat-insulating materials in the building maintenance structure. The heat insulation and preservation of the building are important aspects of saving energy, improving living environment and using function, and the building adopting the outer wall heat preservation technology is one of the most direct and scientific energy-saving modes.
Most of the building heat-insulating materials produced and applied in China at present are organic materials, typically polystyrene granules or polyurethane granules are used as main materials to prepare a polystyrene board heat-insulating system and a polyurethane heat-insulating system, the polystyrene granule or polyurethane granules have lower heat conduction coefficients, and the heat-insulating effect can be improved when the polystyrene granule or polyurethane granules are used in a building maintenance structure. However, the polystyrene board is used as a heat insulation material, the construction process is complex, and the comprehensive cost is high; meanwhile, as the hydrophobicity of the polystyrene board is not suitable for the conventional hydrophilic material, the subsequent construction quality except the surface layer is not easy to guarantee, the quality problems of surface layer mortar cracking, falling, hollowing and the like are easy to occur, and the polystyrene board has great restriction on the use or construction of external decorations of buildings such as face bricks and coatings. The heat-insulating materials made of other organic materials, such as polystyrene particle heat-insulating mortar, foamed polyurethane boards, foamed polyethylene, foamed polypropylene and the like, have the common defects of flammability and easy aging.
At present, as the fire-proof problem of the heat-insulating material is more and more emphasized, the development of domestic inorganic heat-insulating materials is more and more rapid. Compared with organic heat-insulating materials, the traditional inorganic heat-insulating materials have the advantages of good compressive strength and breaking strength, excellent fire resistance and high durability, and the defects of the traditional inorganic heat-insulating materials are highlighted along with the increase of market proportion of the inorganic heat-insulating materials, such as poor heat-insulating property, complex construction steps, large application range limitation and the like due to the use of a large amount of mortar.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention aims to provide gypsum-based heat-insulating slurry and a preparation method thereof.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a gypsum-based thermal insulation slurry, wherein each cubic of the slurry comprises the following raw materials: 60-90kg of hydrophobic modified expanded perlite, 350kg of gypsum-steel slag composite gel, 1.5-5kg of water reducing agent, 0.5-5kg of retarder, 0.5-6kg of waterproof agent, 1-5kg of thickening agent and 200kg of water.
According to the gypsum-based insulating slurry, each cubic raw material composition is preferably as follows: 70-80kg of hydrophobic modified expanded perlite, 300kg of gypsum-steel slag composite gel 200-containing materials, 2.5-4kg of water reducing agent, 1.5-4kg of retarder, 1.5-5kg of waterproof agent, 2-4kg of thickening agent and 190kg of water-containing materials.
According to the gypsum-based insulating slurry, each cubic raw material composition is preferably as follows: 75kg of hydrophobic modified expanded perlite, 250kg of gypsum-steel slag composite gel, 3kg of water reducing agent, 2kg of retarder, 3.5kg of waterproof agent, 3kg of thickening agent and 142kg of water.
According to the gypsum-based insulation slurry, preferably, the hydrophobic modified expanded perlite comprises hydrophobic modified expanded perlite with the grain size of more than 2.36mm and less than or equal to 4.75mm, hydrophobic modified expanded perlite with the grain size of more than 1.80mm and less than or equal to 2.36mm, and hydrophobic modified expanded perlite with the grain size of less than or equal to 1.80mm according to the mass ratio of (2-4): (1-2.5): (5-5.5) are compounded. .
According to the gypsum-based thermal insulation slurry, preferably, the preparation method of the gypsum-steel slag composite gel comprises the following steps: uniformly mixing gypsum and steel slag, adding silica fume, mixing, then adding water, mixing uniformly, and forming to obtain gypsum-steel slag composite gel; wherein the mass ratio of the gypsum to the steel slag is (65-90): (10-35); the dosage of the silica fume is 0.5 to 4 percent of the total weight of the gypsum and the steel slag.
According to the gypsum-based heat preservation slurry, preferably, the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
According to the gypsum-based heat-insulating slurry, the retarder is preferably at least one of sodium citrate, sodium tripolyphosphate and sodium polyphosphate.
According to the gypsum-based heat preservation slurry, the waterproof agent is preferably an organosilicon emulsion type waterproof agent.
According to the gypsum-based insulation slurry, the thickener is preferably at least one of carboxymethyl cellulose, carboxypropyl cellulose, hydroxyethyl cellulose, methyl cellulose and carboxypropyl methyl cellulose.
In a second aspect, the invention provides a preparation method of the gypsum-based thermal insulation slurry, which comprises the following steps:
(1) mixing the hydrophobic modified expanded perlite and the gypsum-steel slag composite gel to obtain a mixture A;
(2) uniformly mixing a water reducing agent, a retarder, a waterproof agent, a thickening agent and water to obtain a mixture B;
(3) and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the gypsum-based heat-insulating slurry.
Compared with the prior art, the invention has the following positive beneficial effects:
(1) the added multi-level aggregate can reduce the self weight of the material to a certain extent; and because of the existence of the aggregate, the volume stability of the heat-insulating slurry can be ensured, so that the phenomenon of separation from the wall panel caused by shrinkage of the dried material is avoided, the close fitting of the wall body and the wall panel is ensured, and the comprehensive bearing capacity of the wall body is improved.
(2) The added multistage aggregate has large volume and light weight, so that the gypsum-based heat-insulating slurry has good heat-insulating property.
(3) Because the gypsum is not water-resistant, the gypsum-steel slag composite gel is adopted to replace pure gypsum, so that the water resistance of the gypsum-based heat-insulating slurry can be effectively improved.
(4) The heat-insulating slurry prepared by taking the multi-level aggregate and the gypsum-steel slag composite gel as main raw materials can replace mortar to be used for building heat insulation.
(5) The dry density of the gypsum-based heat-insulating slurry prepared by the invention is 210-276kg/m3The compression strength is 0.21-0.48MPa, the softening coefficient is 0.51-0.60, the bonding strength is 0.11-0.15MPa, and the heat conductivity is only 0.064-0.069W/(m.K), so that the heat insulation material has good mechanical property and heat insulation property.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the scope of the present invention is not limited thereto.
Example 1:
a gypsum-based insulating slurry, each cube of which consists of: 75kg of hydrophobic modified expanded perlite, 250kg of gypsum-steel slag composite gel, 3kg of polycarboxylic acid high-performance water reducing agent, 2kg of sodium citrate, 3.5kg of organosilicon emulsion type waterproof agent, 3kg of carboxymethyl cellulose and 142kg of water. The preparation method of the gypsum-based heat-insulating slurry comprises the following steps:
(1) uniformly mixing 75kg of water-adding modified expanded perlite and 250kg of gypsum-steel slag composite gel to obtain a mixture A; wherein the water-increasing modified expanded perlite comprises hydrophobic modified expanded perlite with the grain diameter being more than 2.36mm and less than or equal to 4.75mm, hydrophobic modified expanded perlite with the grain diameter being more than 1.80mm and less than or equal to 2.36mm, and hydrophobic modified expanded perlite with the grain diameter being less than or equal to 1.80mm according to the mass ratio of 4: 1: 5, compounding; the gypsum-steel slag composite gel is prepared by uniformly mixing gypsum and steel slag according to the mass ratio of 65:35, adding silica fume, mixing, adding water, uniformly mixing and forming, wherein the use amount of the silica fume is 2% of the total mass of the gypsum and the steel slag;
(2) uniformly mixing a polycarboxylic acid high-performance water reducing agent, sodium citrate, an organic silicon emulsion type waterproof agent, carboxymethyl cellulose and water according to the mass to obtain a mixture B;
(3) and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the gypsum-based heat-insulating slurry.
Example 2:
a gypsum-based insulating slurry, each cube of which consists of: 70kg of hydrophobic modified expanded perlite, 200kg of gypsum-steel slag composite gel, 2.5kg of polycarboxylic acid high-performance water reducing agent, 1.5kg of sodium tripolyphosphate, 1.5kg of organosilicon emulsion type waterproof agent, 2kg of carboxypropyl cellulose and 135kg of water. The preparation method of the gypsum-based heat-insulating slurry comprises the following steps:
(1) uniformly mixing 70kg of water-increasing modified expanded perlite and 200kg of gypsum-steel slag composite gel to obtain a mixture A; wherein the water-increasing modified expanded perlite comprises hydrophobic modified expanded perlite with the grain diameter being more than 2.36mm and less than or equal to 4.75mm, hydrophobic modified expanded perlite with the grain diameter being more than 1.80mm and less than or equal to 2.36mm, and hydrophobic modified expanded perlite with the grain diameter being less than or equal to 1.80mm according to the mass ratio of 2: 2.5: 5.5 are compounded; the gypsum-steel slag composite gel is prepared by uniformly mixing gypsum and steel slag according to the mass ratio of 90:10, adding silica fume, mixing, adding water, uniformly mixing and forming, wherein the use amount of the silica fume is 0.5% of the total mass of the gypsum and the steel slag;
(2) uniformly mixing a polycarboxylic acid high-performance water reducing agent, sodium tripolyphosphate, an organosilicon emulsion type waterproof agent, carboxypropyl cellulose and water according to the mass to obtain a mixture B;
(3) and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the gypsum-based heat-insulating slurry.
Example 3:
a gypsum-based insulating slurry, each cube of which consists of: 80kg of hydrophobic modified expanded perlite, 300kg of gypsum-steel slag composite gel, 4kg of polycarboxylic acid high-performance water reducing agent, 3kg of sodium polyphosphate, 5kg of organosilicon emulsion type waterproof agent, 4kg of methyl cellulose and 150kg of water. The preparation method of the gypsum-based heat-insulating slurry comprises the following steps:
(1) uniformly mixing 80kg of water-adding modified expanded perlite and 300kg of gypsum-steel slag composite gel to obtain a mixture A; wherein the water-increasing modified expanded perlite comprises hydrophobic modified expanded perlite with the grain diameter being more than 2.36mm and less than or equal to 4.75mm, hydrophobic modified expanded perlite with the grain diameter being more than 1.80mm and less than or equal to 2.36mm, and hydrophobic modified expanded perlite with the grain diameter being less than or equal to 1.80mm, the mass ratio of the hydrophobic modified expanded perlite to the water-increasing modified expanded perlite is 3.5: 1.5: 5, compounding; the gypsum-steel slag composite gel is prepared by uniformly mixing gypsum and steel slag according to the mass ratio of 85:15, adding silica fume, mixing, adding water, uniformly mixing and forming, wherein the use amount of the silica fume is 4% of the total mass of the gypsum and the steel slag;
(2) uniformly mixing a polycarboxylic acid high-performance water reducing agent, sodium polyphosphate, an organosilicon emulsion type waterproof agent, methyl cellulose and water according to the mass to obtain a mixture B;
(3) and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the gypsum-based heat-insulating slurry.
Example 4:
a gypsum-based insulating slurry, each cube of which consists of: 60kg of hydrophobic modified expanded perlite, 150kg of gypsum-steel slag composite gel, 1.5kg of polycarboxylic acid high-performance water reducing agent, 0.5kg of sodium citrate, 0.5kg of organosilicon emulsion type waterproof agent, 2kg of carboxypropyl cellulose and 130kg of water. The preparation method of the gypsum-based heat-insulating slurry comprises the following steps:
(1) uniformly mixing 60kg of water-increasing modified expanded perlite and 150kg of gypsum-steel slag composite gel to obtain a mixture A; wherein the water-increasing modified expanded perlite comprises hydrophobic modified expanded perlite with the grain diameter being more than 2.36mm and less than or equal to 4.75mm, hydrophobic modified expanded perlite with the grain diameter being more than 1.80mm and less than or equal to 2.36mm, and hydrophobic modified expanded perlite with the grain diameter being less than or equal to 1.80mm according to the mass ratio of 3: 1.8: 5.2 are compounded; the gypsum-steel slag composite gel is prepared by uniformly mixing gypsum and steel slag according to the mass ratio of 80:20, adding silica fume, mixing, adding water, uniformly mixing and forming, wherein the use amount of the silica fume is 2% of the total mass of the gypsum and the steel slag;
(2) uniformly mixing a polycarboxylic acid high-performance water reducing agent, sodium citrate, an organic silicon emulsion type waterproof agent, carboxypropyl cellulose and water according to the mass to obtain a mixture B;
(3) and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the gypsum-based heat-insulating slurry.
Example 5:
a gypsum-based insulating slurry, each cube of which consists of: 90kg of hydrophobic modified expanded perlite, 350kg of gypsum-steel slag composite gel, 5kg of polycarboxylic acid high-performance water reducing agent, 5kg of sodium tripolyphosphate, 6kg of organosilicon emulsion type waterproofing agent, 5kg of hydroxyethyl cellulose and 155kg of water. The preparation method of the gypsum-based heat-insulating slurry comprises the following steps:
(1) uniformly mixing 90kg of water-adding modified expanded perlite and 350kg of gypsum-steel slag composite gel to obtain a mixture A; wherein the water-increasing modified expanded perlite comprises hydrophobic modified expanded perlite with the grain diameter being more than 2.36mm and less than or equal to 4.75mm, hydrophobic modified expanded perlite with the grain diameter being more than 1.80mm and less than or equal to 2.36mm, and hydrophobic modified expanded perlite with the grain diameter being less than or equal to 1.80mm, the mass ratio of the hydrophobic modified expanded perlite to the water-increasing modified expanded perlite is 3.4: 1.6: 5, compounding; the gypsum-steel slag composite gel is prepared by uniformly mixing gypsum and steel slag according to the mass ratio of 60:40, adding silica fume, mixing, adding water, uniformly mixing and forming, wherein the use amount of the silica fume is 2% of the total mass of the gypsum and the steel slag;
(2) uniformly mixing a polycarboxylic acid high-performance water reducing agent, sodium tripolyphosphate, an organosilicon emulsion type waterproof agent, hydroxyethyl cellulose and water according to the mass to obtain a mixture B;
(3) and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the gypsum-based heat-insulating slurry.
The gypsum-based heat-insulating slurry prepared in examples 1 to 5 was subjected to mechanical property and heat-insulating property tests according to GB/T5486-2008 and GB/T10294-2008, and the test results are shown in Table 1.
TABLE 1 data of mechanical and thermal insulation properties of gypsum-based insulation slurries prepared according to the present invention
As can be seen from Table 1, the gypsum-based thermal insulation slurry prepared by the present invention can have a dry density of 210kg/m or less3The compression strength can reach 0.48MPa to the maximum, the bonding strength is more than 0.11MPa, and the thermal conductivity coefficient is less than 0.069W/(m.K), so that the heat-insulating slurry prepared by the invention has good heat-insulating property, volume stability, certain mechanical strength, water resistance and bonding strength, can increase the bonding between the slurry and a substrate, and cannot generate cracks and hollowing.
The foregoing description only expresses several embodiments of the present invention, and the description is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The gypsum-based heat-insulating slurry is characterized in that each cube of raw materials comprises the following components: 60-90kg of hydrophobic modified expanded perlite, 350kg of gypsum-steel slag composite gel, 1.5-5kg of water reducing agent, 0.5-5kg of retarder, 0.5-6kg of waterproof agent, 1-5kg of thickening agent and 200kg of water.
2. The gypsum-based insulating slurry according to claim 1, wherein each cube of raw materials consists of: 70-80kg of hydrophobic modified expanded perlite, 300kg of gypsum-steel slag composite gel 200-containing materials, 2.5-4kg of water reducing agent, 1.5-4kg of retarder, 1.5-5kg of waterproof agent, 2-4kg of thickening agent and 190kg of water-containing materials.
3. The gypsum-based insulating slurry according to claim 2, wherein each cube of raw materials consists of: 75kg of hydrophobic modified expanded perlite, 250kg of gypsum-steel slag composite gel, 3kg of water reducing agent, 2kg of retarder, 3.5kg of waterproof agent, 3kg of thickening agent and 142kg of water.
4. The gypsum-based thermal insulation slurry according to claim 3, wherein the hydrophobic modified expanded perlite comprises hydrophobic modified expanded perlite with the grain size of 2.36mm < 4.75mm, hydrophobic modified expanded perlite with the grain size of 1.80mm < 2.36mm, and hydrophobic modified expanded perlite with the grain size of 1.80mm < 1.80mm, according to the mass ratio of (2-4): (1-2.5): (5-5.5) are compounded.
5. The gypsum-based thermal insulation slurry according to claim 4, wherein the preparation method of the gypsum-steel slag composite gel comprises the following steps: uniformly mixing gypsum and steel slag, adding silica fume, mixing, then adding water, mixing uniformly, and forming to obtain gypsum-steel slag composite gel; wherein the mass ratio of the gypsum to the steel slag is (65-90): (10-35); the dosage of the silica fume is 0.5 to 4 percent of the total weight of the gypsum and the steel slag.
6. The gypsum-based insulation slurry according to claim 5, wherein the water reducing agent is a polycarboxylic acid high performance water reducing agent.
7. The gypsum-based insulation slurry according to claim 6, wherein the retarder is at least one of sodium citrate, sodium tripolyphosphate, and sodium polyphosphate.
8. The gypsum-based insulation slurry according to claim 7, wherein the water repellent is an organosilicon emulsion type water repellent.
9. The gypsum-based insulation slurry according to claim 8, wherein the thickener is at least one of carboxymethyl cellulose, carboxypropyl cellulose, hydroxyethyl cellulose, methyl cellulose, carboxypropyl methyl cellulose.
10. A method of preparing the gypsum-based insulating slurry according to any one of claims 1 to 9, comprising the steps of:
(1) mixing the hydrophobic modified expanded perlite and the gypsum-steel slag composite gel to obtain a mixture A;
(2) uniformly mixing a water reducing agent, a retarder, a waterproof agent, a thickening agent and water to obtain a mixture B;
(3) and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the gypsum-based heat-insulating slurry.
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