CN114276057B - Heat-insulating cement mortar and application thereof - Google Patents
Heat-insulating cement mortar and application thereof Download PDFInfo
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Abstract
The invention discloses heat-insulating cement mortar and application thereof, wherein the heat-insulating cement mortar is prepared by the following method: mixing 85-115 parts by weight of limestone, 40-62 parts by weight of mineral aggregate or modified mineral aggregate, 21-27 parts by weight of silicon powder, 5-13 parts by weight of glass filling fiber, 7-13 parts by weight of polyethylene glycol trimethoxy silicon propyl ether, 1-5 parts by weight of foaming agent, 1-5 parts by weight of dispersing agent and 130-155 parts by weight of water at 20-30 ℃, and then stirring at the rotating speed of 80-100rpm for 20-35min to obtain the composite material. The heat-insulating cement mortar disclosed by the invention is used in construction of building walls, and has excellent heat-insulating effect, fireproof effect and alkali-resistant effect.
Description
Technical Field
The invention belongs to the technical field of cement mortar, and particularly relates to heat-insulating cement mortar and application thereof.
Background
In order to improve the heat preservation and insulation effect of cement mortar, some auxiliary materials with high porosity, such as ceramic aggregate and glass, are usually added to realize the heat preservation and insulation functions. But the surface of the ceramic aggregate is smooth, the dispersibility and the compatibility are poor when the ceramic aggregate is blended with cement mortar, and in addition, the ceramic aggregate has low density and is easy to float and delaminate, thereby increasing the construction difficulty. Chinese patent CN106467380A discloses a heat-preservation and heat-insulation cement mortar, which is prepared from the following components: 80-100 parts of cement, 20-30 parts of fly ash, 50-60 parts of gypsum powder, 2-3 parts of hydrogen peroxide, 5-8 parts of ash calcium, 4-8 parts of latex powder, 2-8 parts of light heat insulation material, 1-3 parts of antifreezing agent, 2-3 parts of expanding agent and 30-50 parts of water; the cement mortar is stable, has a good using effect, has strong adhesive force, effectively plays a role in heat preservation and insulation and is low in manufacturing cost; however, the alkali resistance of cement mortar is not good and the durability thereof is affected.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides heat-insulating cement mortar and application thereof.
In order to solve the technical problems, the invention adopts the technical scheme that:
the preparation method of the heat insulation cement mortar comprises the following steps: mixing 85-115 parts by weight of limestone, 40-62 parts by weight of mineral aggregate or modified mineral aggregate, 21-27 parts by weight of silicon powder, 5-13 parts by weight of glass filling fiber, 7-13 parts by weight of polyethylene glycol trimethoxy silicon propyl ether, 1-5 parts by weight of foaming agent, 1-5 parts by weight of dispersing agent and 130-155 parts by weight of water at 20-30 ℃, and then stirring at the rotating speed of 80-100rpm for 20-35min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture of kaolin, diatomite and talcum powder according to the mass ratio of (1-10) to (1-6) to (2-5).
Preferably, the preparation method of the modified mineral aggregate comprises the following steps:
adding mineral aggregate into 10-30wt% of nitric acid water solution according to the solid-liquid ratio of 1kg (3-6) L, and soaking for 1-3h, wherein the mineral aggregate is a mixture of kaolin, diatomite and talcum powder according to the mass ratio of (1-10) to (1-6) to (2-5); filtering, washing with water to neutrality, drying at 50-70 deg.C for 5-10 hr, pulverizing, and sieving with 100-300 mesh sieve to obtain pretreated mineral aggregate; mixing 3-aminopropyltriethoxysilane, tris (trimethylsilyl) phosphite and the pretreated mineral aggregate in a mass ratio of (1-3) to (3-6) to (60-80), and stirring at a rotating speed of 700-1000rpm for 2-5h to obtain the modified mineral aggregate.
The foaming agent is at least one of a vegetable protein foaming agent, an animal protein foaming agent, coconut oleic acid diethanolamide and casein borate.
Preferably, the foaming agent is a mixture of coconut diethanolamide and casein borate.
The casein borate has good foaming capacity, and can be used together with coconut diethanolamide to ensure that the heat-insulating cement mortar obtains a rich, fine and uniform foam structure. Because the air has high specific heat capacity and low heat conductivity coefficient, the existence of a large number of bubble cavities can obviously reduce the heat conductivity coefficient of the cement, and the heat preservation and insulation capacity of the cement is improved. And the amino group in the casein, the aminosiloxane and the polyurethane have higher affinity and compatibility because of containing nitrogen elements, the glass filling fiber added with the polyurethane group can enhance the foaming capacity of the casein borate, and the casein borate can also enhance the heat preservation, the heat insulation and the alkali resistance of the glass filling fiber, thereby generating unexpected technical effects. Moreover, the boron element in the casein borate adopted by the invention also forms a covalent bond with the boron element in the glass fiber, so that the whole cement material system has better stability, and unexpected technical effects are obtained.
More preferably, the foaming agent is a mixture of coconut diethanolamide and casein borate in a mass ratio of (1-5) to (3-12).
The dispersant is at least one of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide.
Preferably, the dispersing agent is a mixture of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide according to the mass ratio of (1-8.5) to (1-7) to (2-8).
The polyacrylamide structural unit contains amide groups, hydrogen bonds are easy to form, and various modifiers with branched chains or network structures are easy to obtain through grafting or crosslinking. According to the invention, polyacrylamide is used as one of cement dispersants, a large number of hydrogen bonds are generated among amide groups in the polyacrylamide, the aminosiloxane and the polyurethane, and a three-dimensional space network crosslinking relation with rich branched chains and high strength is further generated in the cement matrix with a rich fine foam honeycomb structure, so that the stability, the heat preservation and insulation property and the alkali resistance of the cement are improved. And the foaming capacity of the latter and the stability of the obtained foam are enhanced by the polyacrylamide and the casein borate, rich, fine, uniform and lasting foam is obtained, a honeycomb internal structure with good heat preservation and insulation performance is formed, and the heat-insulation cement mortar with better heat preservation and insulation performance is obtained.
The preparation method of the glass filling fiber comprises the following steps:
f1, mixing silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide, and then putting the mixture into a planetary ball mill for ball milling to obtain a prefabricated material;
f2, smelting the prefabricated material under the protection of nitrogen, and then putting the prefabricated material into a wire drawing machine to draw the prefabricated material into wires to obtain glass wires;
f3, mixing and homogenizing polyurethane, aminosiloxane, acrylic acid and water to obtain finishing emulsion;
and F4, mixing the glass fibers, the finishing emulsion and the maleic anhydride polymer, carrying out ultrasonic-assisted reaction, filtering, washing filter residues with water, and drying with hot air to obtain the glass filling fibers.
The radius of the boron atom is 90pm, and the valence electronic structure is 2s2p, so that boron has the characteristics of high ionization energy, high electronegativity and easy formation of covalent bond molecules. According to the invention, boron oxide, silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, iron oxide and titanium dioxide are mixed to be used as sintering raw materials of glass fibers, so that the glass fibers with low thermal expansion coefficient, thermal shock resistance, heat resistance, corrosion resistance and high mechanical strength are obtained, and the glass fibers are used in the heat-insulating cement mortar and the preparation method thereof to obtain the cement mortar with good heat-insulating property and strong alkali resistance.
In the traditional preparation process of the glass fiber reinforced cement, glass reinforced fibers are directly added into a cement system, but because glass phases and minerals in the cement system have different lattice coefficients and different grain boundary energies, internal stress is easy to occur in the cement due to changes of conditions such as environmental temperature and humidity in the curing and subsequent service processes of an obtained cement product, the property of the material is in a metastable state due to the existence of the internal stress, namely the material has a tendency of generating deformation phenomena including cracking and the like to release redundant internal stress, and the potential safety hazard is undoubtedly brought.
Compared with PVC foaming materials, the polyurethane has better stability, chemical resistance, rebound resilience, mechanical strength and smaller compression deformation rate, and also has good heat insulation, sound insulation and earthquake resistance. Therefore, the invention utilizes the amino siloxane, acrylic acid and other raw materials to modify the surface of the obtained glass fiber with the polyurethane, so that the compatibility between the glass fiber and a cement system is enhanced by virtue of the molecular structure of the polyurethane, the stability of the cement is improved, the heat conductivity coefficient of the cement is reduced, and the heat insulation capability of the cement is improved.
Preferably, the preparation method of the glass-filled fiber comprises the following steps:
f1, mixing silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide according to the mass ratio of (58-63.2): (10.4-12.7): (21.5-25.8): (1.1-3.2): (0.1-0.7): (0.2-0.9): 0.3-1) at 20-30 ℃, putting into a planetary ball mill, and carrying out ball milling at the rotating speed of 300-500rpm for 5-8h, wherein the material of a grinding ball is sintered corundum, and the ball-material ratio is (12-15): 1 to obtain a prefabricated material;
f2, under the protection of nitrogen, smelting the prefabricated material at 1640-1645 ℃ for 2.5-4h, and then putting the prefabricated material into a wire drawing machine to draw wires at a wire drawing speed of 90-110m/min to obtain glass wires with the diameter of 8-10 mu m;
f3, homogenizing polyurethane, aminosilicone, acrylic acid and water according to the mass ratio of (1-1.4): (3.5-4): (2.5-3): (4-6) at the temperature of 48-55 ℃ and the rotating speed of 4000-5000rpm for 10-20min to obtain finishing emulsion;
f4, mixing the glass fiber, the finishing emulsion and the maleic anhydride polymer according to the mass ratio of (4.5-5.5) to (7.5-9) to (0.75-0.9), carrying out ultrasonic auxiliary reaction at 79-83 ℃ with the frequency of 38-42kHz and the power of 300-330W for 230-280min, washing filter residue with water at the temperature of 43-48 ℃ and the flow rate of 1-2L/min for 10-15min after filtering, and then washing the filter residue with water at the temperature of 75-80 ℃ and the air volume of 6000-7000m 3 And (4) drying for 2-3h under the working condition of/h by hot air to obtain the glass filling fiber.
The aminosiloxane is at least one of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane.
The aminosiloxane is amino contained in N- (3-acryloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane and the amino groups and the unique molecular weight and the unique molecular configuration of the amino groups respectively, so that the amino groups can be further connected with carbon nitrogen bonds in polyurethane after being grafted to the surface of the glass fiber, and nitrogen elements contained in the amino groups and the amino groups share an electron cloud, so that the crosslinking strength between the aminosiloxane and the polyurethane is further improved.
Preferably, the aminosiloxane is a mixture of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane in a mass ratio of (3-5): (4-6): (5-9).
The maleic anhydride polymer is at least one of styrene-maleic anhydride random copolymer, castor oil and maleic anhydride polymer.
The benzene structure in the styrene-maleic anhydride random copolymer and the long carbon chain in the polymer of castor oil and maleic anhydride can enhance the compatibility between the glass filling fiber and the nonpolar groups in the coconut diethanolamide and the polyethylene glycol monoallyl ether, so that the dispersity of the obtained glass filling fiber in a cement matrix is modified, the agglomeration phenomenon possibly caused by introducing polyurethane is avoided, the mortar obtains a more uniform and isotropic structure after curing, and the internal stress and even damage deformation possibly generated along with the change of external conditions including temperature, humidity, pressure and the like in the subsequent service process are avoided.
Preferably, the maleic anhydride polymer is a mixture of a styrene-maleic anhydride random copolymer and a polymer of castor oil and maleic anhydride in a mass ratio of (1-3) to (1-3).
The carbon-carbon double bonds contained in the two maleic anhydride polymers are respectively in different molecular configurations, so that when the two maleic anhydride polymers are compounded to be used for preparing the glass filling fiber, the crosslinking complexity of polyurethane and the aminosiloxane is further enhanced, the compatibility between the glass filling fiber and a cement system is improved by improving the energy state of a grafting group, the dispersion condition of the glass filling fiber is improved, the mortar obtains a more uniform and isotropic structure after curing, rich, fine, uniform and lasting foam is obtained, a honeycomb internal structure with good heat insulation performance is formed, the heat insulation cement mortar with better heat insulation performance is obtained, and unexpected technical effects are obtained.
More preferably, the maleic anhydride polymer is a mixture of a styrene-maleic anhydride random copolymer, a polymer of castor oil and maleic anhydride in a mass ratio of 1.
The heat-insulating cement mortar is applied to construction of building walls.
The invention has the beneficial effects that: the heat-insulating cement mortar is prepared by mixing and stirring limestone, mineral aggregate or modified mineral aggregate, silicon powder, glass filling fiber, polyethylene glycol trimethoxy silicon propyl ether, a foaming agent, a dispersing agent and water, and has excellent heat-insulating effect, fireproof effect and alkali-resistant effect. The glass filling fiber is prepared by taking silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, ferric oxide, titanium dioxide and boron oxide as raw materials, performing ball milling, sintering and wire drawing treatment, and adding finishing emulsion under an ultrasonic condition for reaction, and has good dispersibility and compatibility in cement mortar.
Detailed Description
The above summary of the present invention is described in further detail below with reference to specific embodiments, but it should not be understood that the scope of the above subject matter of the present invention is limited to the following examples.
Introduction of some raw materials in this application:
limestone, CAS No.: 1317-65-3, changxing Qingsheng calcium industry Co., ltd, mesh: 200, performing the standard: GB/T30190-2013 limestone powder concrete.
Kaolin, CAS number: 1318-74-7, shanghai Yangjiang chemical Co., ltd., mesh number: 150 mesh, execution standard: JC/T2370-2016 fine kaoline.
Diatomaceous earth, CAS No.: 68855-54-9, jinan Shuangying chemical Co., ltd, mesh number: 100 mesh, execution standard: JC/T414-2017 diatomite.
Talc, CAS No.: 14807-96-6, changxing morning bright chemical Co., ltd., mesh number: 400 mesh, execution standard: GB/T15342-2012 Talc powder.
Silicon powder, CAS number: 7440-21-3, shandongtian collar building materials Co., ltd, mesh number: 600 mesh, execution standard: DL/T5777-2018 technical Specification for silica powder for hydraulic concrete mixing.
Polyethylene glycol trimethoxysilylpropyl ether, no. CSA: 98358-37-3, caruncle facile chemie limited, molecular weight: 2 ten thousand.
Coconut oil diethanolamide, CAS No.: 68603-42-9, manufactured by Wande chemical Co., ltd, hubei.
Casein borate, CAS No.: 68131-51-1, wuhan pluov biotechnology limited, molecular weight: 2.3 ten thousand.
Alkali lignin, CAS number: 8068-05-1, shanghai Zi reagent factory, cat #: 093932, molecular weight: 505.01.
Polyethylene glycol monoallyl ether, CAS No.: 27274-31-3, hubei Chu scintillation Biotechnology Inc., molecular weight: 102.1317.
Polyacrylamide, CAS No.: 9003-05-8, chengdu He Pont chemical Co., ltd., molecular weight: 830 ten thousand.
Silica, CAS No.: 7631-86-9 Rugao Feidao chemical plant, particle size: 200 meshes.
Alumina, CAS number: 1302-74-5, rugao Feida chemical plant, particle size: 200 meshes.
Calcium oxide, CAS No.: 1305-78-8, rugao Feida chemical plant, particle size: 250 meshes.
Magnesium oxide, CAS No.: 1309-48-4, rugao Feida chemical plant, particle size: 200 meshes.
Iron oxide, CAS No.: 1332-37-2, satsugao Feidao chemical plant, particle size: 150 meshes.
Titanium dioxide, CAS No.: 1317-80-2, satsugao Feida chemical plant, particle size: 400 meshes.
Boron oxide, CAS No.: 1303-86-2, rugao Feida chemical plant, particle size: 100 meshes.
Polyurethane, CAS No.: 9009-54-5, shandongkei polyurethane Co., ltd, molecular weight: 3 ten thousand.
N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, CAS No.: 123198-57-2.
3- (3-aminophenoxy) propyltrimethoxysilane, CAS No.: 55648-29-8.
N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane, CAS No.: 70240-34-5.
3-aminopropyltriethoxysilane, CAS No.: 919-30-2.
Tris (trimethylsilyl) phosphite, CAS No.: 1795-31-9.
Styrene-maleic anhydride random copolymer, CAS No.: 31959-78-1, molecular weight: 1.7 million, tianmen Changchang chemical Co.
Polymer of castor oil with maleic anhydride, CAS number: 68308-83-8, molecular weight: 2.4 million, tianmen Changchang chemical Co.
Commercially available glass wool, shandong Sen hong engineering materials Co., ltd., cargo number: 5575, fiber length: 15mm, fiber diameter: 10 μm, modulus of elasticity: 80GPa, softening point: 860 deg.C.
Example 1
The preparation method of the heat insulation cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of mineral aggregate, 25 parts by weight of silica powder, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at 100rpm for 25min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture consisting of kaolin, diatomite and talcum powder according to a mass ratio of 4.
The foaming agent is a mixture consisting of coconut diethanolamide and casein borate according to a mass ratio of 4.
The dispersing agent is a mixture consisting of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide in a mass ratio of 5.
Example 2
The preparation method of the heat-insulating cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of mineral aggregate, 25 parts by weight of silicon powder, 10 parts by weight of glass-filled fiber, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at a rotation speed of 100rpm for 25min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture consisting of kaolin, diatomite and talcum powder according to a mass ratio of 4.
The foaming agent is a mixture consisting of coconut diethanolamide and casein borate in a mass ratio of 4.
The dispersing agent is a mixture consisting of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide in a mass ratio of 5.
The preparation method of the glass filling fiber comprises the following steps:
f1, homogenizing polyurethane, aminosilicone, acrylic acid and water at a mass ratio of 1.2;
f2, mixing commercially available glass fibers, finishing milk and a maleic anhydride polymer according to a mass ratio of 5 3 And (4) drying for 2 hours by hot air under the working condition of/h to obtain the glass filling fiber.
The aminosiloxane is a mixture consisting of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane in a mass ratio of 4.
The maleic anhydride polymer is a styrene-maleic anhydride random copolymer.
Example 3
The preparation method of the heat insulation cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of mineral aggregate, 25 parts by weight of silicon powder, 10 parts by weight of glass-filled fiber, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at a rotation speed of 100rpm for 25min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture consisting of kaolin, diatomite and talcum powder according to a mass ratio of 4.
The foaming agent is a mixture consisting of coconut diethanolamide and casein borate according to a mass ratio of 4.
The dispersing agent is a mixture consisting of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide in a mass ratio of 5.
The preparation method of the glass filling fiber comprises the following steps:
f1, mixing silica, alumina, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide at a mass ratio of 60;
and F2, under the protection of nitrogen, smelting the prefabricated material at 1642 ℃ for 3h, and then putting the prefabricated material into a wire drawing machine to draw the prefabricated material into wires at a wire drawing speed of 100m/min to obtain the glass filling fibers with the diameter of 9 microns.
The aminosiloxane is a mixture consisting of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane in a mass ratio of 4.
The maleic anhydride polymer is a styrene-maleic anhydride random copolymer.
Example 4
The preparation method of the heat insulation cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of mineral aggregate, 25 parts by weight of silica powder, 10 parts by weight of glass-filled fiber, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at 100rpm for 25min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture consisting of kaolin, diatomite and talcum powder in a mass ratio of 4.
The foaming agent is a mixture consisting of coconut diethanolamide and casein borate according to a mass ratio of 4.
The dispersing agent is a mixture consisting of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide in a mass ratio of 5.
The preparation method of the glass filling fiber comprises the following steps:
f1, mixing silica, alumina, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide at a mass ratio of 60;
f2, under the protection of nitrogen, smelting the prefabricated material at 1642 ℃ for 3h, and then putting the prefabricated material into a wire drawing machine to draw the prefabricated material into wires at a wire drawing speed of 100m/min to obtain glass wires with the diameter of 9 mu m;
f3, homogenizing the polyurethane, the triethoxysilane, the acrylic acid and the water at the mass ratio of 1.2;
f4, mixing the glass fiber, the finishing milk and the maleic anhydride polymer according to a mass ratio of 5.85 3 And (4) drying for 2 hours by hot air under the working condition of/h to obtain the glass filling fiber.
The maleic anhydride polymer is a styrene-maleic anhydride random copolymer.
Example 5
The preparation method of the heat insulation cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of mineral aggregate, 25 parts by weight of silica powder, 10 parts by weight of glass-filled fiber, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at 100rpm for 25min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture consisting of kaolin, diatomite and talcum powder according to a mass ratio of 4.
The foaming agent is a mixture consisting of coconut diethanolamide and casein borate according to a mass ratio of 4.
The dispersing agent is a mixture of alkali lignin and polyethylene glycol monoallyl ether in a mass ratio of 5.
The preparation method of the glass filling fiber comprises the following steps:
f1, mixing silica, alumina, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide at a mass ratio of 60;
f2, under the protection of nitrogen, smelting the prefabricated material at 1642 ℃ for 3h, and then putting the prefabricated material into a wire drawing machine to draw the prefabricated material into wires at a wire drawing speed of 100m/min to obtain glass wires with the diameter of 9 mu m;
f3, homogenizing the polyurethane, the aminosilicone, the acrylic acid and the water for 15min at the rotation speed of 5000rpm at the temperature of 50 ℃ according to the mass ratio of 1.2;
f4, mixing the glass fiber, the finishing emulsion and the maleic anhydride polymer according to a mass ratio of 5.85 3 And (4) drying for 2 hours by hot air under the working condition of/h to obtain the glass filling fiber.
The aminosiloxane is a mixture consisting of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane in a mass ratio of 4.
The maleic anhydride polymer is a styrene-maleic anhydride random copolymer.
Example 6
The preparation method of the heat insulation cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of mineral aggregate, 25 parts by weight of silica powder, 10 parts by weight of glass-filled fiber, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at 100rpm for 25min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture consisting of kaolin, diatomite and talcum powder in a mass ratio of 4.
The foaming agent is coconut diethanolamide.
The dispersing agent is a mixture consisting of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide in a mass ratio of 5.
The preparation method of the glass filling fiber comprises the following steps:
f1, mixing silica, alumina, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide at a mass ratio of 60;
f2, under the protection of nitrogen, smelting the prefabricated material at 1642 ℃ for 3h, and then putting the prefabricated material into a wire drawing machine to draw the prefabricated material into wires at the wire drawing speed of 100m/min to obtain glass wires with the diameter of 9 mu m;
f3, homogenizing the polyurethane, the aminosilicone, the acrylic acid and the water at the mass ratio of 1.2;
f4, mixing the glass fiber, the finishing milk and the maleic anhydride polymer according to a mass ratio of 5.85 3 And h, drying for 2h by hot air under the working condition of/h to obtain the glass filling fiber.
The aminosiloxane is a mixture consisting of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane in a mass ratio of 4.
The maleic anhydride polymer is a styrene-maleic anhydride random copolymer.
Example 7
The preparation method of the heat insulation cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of mineral aggregate, 25 parts by weight of silicon powder, 10 parts by weight of glass-filled fiber, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at a rotation speed of 100rpm for 25min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture consisting of kaolin, diatomite and talcum powder according to a mass ratio of 4.
The foaming agent is a mixture consisting of coconut diethanolamide and casein borate in a mass ratio of 4.
The dispersing agent is a mixture consisting of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide in a mass ratio of 5.
The preparation method of the glass filling fiber comprises the following steps:
f1, mixing silica, alumina, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide at a mass ratio of 60;
f2, under the protection of nitrogen, smelting the prefabricated material at 1642 ℃ for 3h, and then putting the prefabricated material into a wire drawing machine to draw the prefabricated material into wires at a wire drawing speed of 100m/min to obtain glass wires with the diameter of 9 mu m;
f3, homogenizing the polyurethane, the aminosilicone, the acrylic acid and the water at the mass ratio of 1.2;
f4, mixing the glass fiber, the finishing emulsion and the maleic anhydride polymer according to a mass ratio of 5.8510min, then 80 deg.C, 7000m air volume 3 And (4) drying for 2 hours by hot air under the working condition of/h to obtain the glass filling fiber.
The aminosiloxane is a mixture consisting of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane and the mass ratio of the components is 4.
The maleic anhydride polymer is a polymer of castor oil and maleic anhydride.
Example 8
The preparation method of the heat insulation cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of mineral aggregate, 25 parts by weight of silicon powder, 10 parts by weight of glass-filled fiber, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at a rotation speed of 100rpm for 25min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture consisting of kaolin, diatomite and talcum powder according to a mass ratio of 4.
The foaming agent is a mixture consisting of coconut diethanolamide and casein borate according to a mass ratio of 4.
The dispersing agent is a mixture consisting of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide in a mass ratio of 5.
The preparation method of the glass filling fiber comprises the following steps:
f1, mixing silica, alumina, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide at a mass ratio of 60;
f2, under the protection of nitrogen, smelting the prefabricated material at 1642 ℃ for 3h, and then putting the prefabricated material into a wire drawing machine to draw the prefabricated material into wires at a wire drawing speed of 100m/min to obtain glass wires with the diameter of 9 mu m;
f3, homogenizing the polyurethane, the aminosilicone, the acrylic acid and the water for 15min at the rotation speed of 5000rpm at the temperature of 50 ℃ according to the mass ratio of 1.2;
f4, mixing the glass fiber, the finishing emulsion and the maleic anhydride polymer according to a mass ratio of 5.85 3 And (4) drying for 2 hours by hot air under the working condition of/h to obtain the glass filling fiber.
The aminosiloxane is a mixture consisting of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane in a mass ratio of 4.
The maleic anhydride polymer is a styrene-maleic anhydride random copolymer.
Example 9
The preparation method of the heat insulation cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of mineral aggregate, 25 parts by weight of silica powder, 10 parts by weight of glass-filled fiber, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at 100rpm for 25min to obtain the heat-insulating cement mortar.
The mineral aggregate is a mixture consisting of kaolin, diatomite and talcum powder according to a mass ratio of 4.
The foaming agent is a mixture consisting of coconut diethanolamide and casein borate according to a mass ratio of 4.
The dispersing agent is a mixture consisting of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide in a mass ratio of 5.
The preparation method of the glass filling fiber comprises the following steps:
f1, mixing silica, alumina, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide at a mass ratio of 60;
f2, under the protection of nitrogen, smelting the prefabricated material at 1642 ℃ for 3h, and then putting the prefabricated material into a wire drawing machine to draw the prefabricated material into wires at a wire drawing speed of 100m/min to obtain glass wires with the diameter of 9 mu m;
f3, homogenizing the polyurethane, the aminosilicone, the acrylic acid and the water for 15min at the rotation speed of 5000rpm at the temperature of 50 ℃ according to the mass ratio of 1.2;
f4, mixing the glass fiber, the finishing emulsion and the maleic anhydride polymer according to a mass ratio of 5.85 3 And (4) drying for 2 hours by hot air under the working condition of/h to obtain the glass filling fiber.
The aminosiloxane is a mixture consisting of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane in a mass ratio of 4.
The maleic anhydride polymer is a mixture of a styrene-maleic anhydride random copolymer, castor oil and maleic anhydride polymer in a mass ratio of 1.
Example 10
The preparation method of the heat insulation cement mortar comprises the following steps: 100 parts by weight of limestone, 50 parts by weight of modified mineral aggregate, 25 parts by weight of silica powder, 10 parts by weight of glass-filled fiber, 10 parts by weight of polyethylene glycol trimethoxysilylpropyl ether, 3 parts by weight of a foaming agent, 3 parts by weight of a dispersing agent and 145 parts by weight of water were mixed at 22 ℃, and then stirred at a rotation speed of 100rpm for 25 minutes to obtain the thermal insulation cement mortar.
The preparation method of the modified mineral aggregate comprises the following steps:
adding 1kg of mineral aggregate into 25wt% of nitric acid water solution according to a solid-liquid ratio of 1kg; filtering, washing with water to neutrality, drying at 65 deg.C for 5 hr, pulverizing, and sieving with 200 mesh sieve to obtain pretreated mineral aggregate; mixing 3-aminopropyltriethoxysilane, tris (trimethylsilyl) phosphite and the pretreated mineral aggregate in a mass ratio of 1.5.
The foaming agent is a mixture consisting of coconut diethanolamide and casein borate in a mass ratio of 4.
The dispersing agent is a mixture consisting of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide in a mass ratio of 5.
The preparation method of the glass filling fiber comprises the following steps:
f1, mixing silica, alumina, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide at a mass ratio of 60;
f2, under the protection of nitrogen, smelting the prefabricated material at 1642 ℃ for 3h, and then putting the prefabricated material into a wire drawing machine to draw the prefabricated material into wires at the wire drawing speed of 100m/min to obtain glass wires with the diameter of 9 mu m;
f3, homogenizing the polyurethane, the aminosilicone, the acrylic acid and the water at the mass ratio of 1.2;
f4, mixing the glass fiber, the finishing emulsion and the maleic anhydride polymer according to a mass ratio of 5.85 3 And (4) drying for 2 hours by hot air under the working condition of/h to obtain the glass filling fiber.
The aminosiloxane is a mixture consisting of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane and the mass ratio of the components is 4.
The maleic anhydride polymer is a mixture of a styrene-maleic anhydride random copolymer, castor oil and maleic anhydride polymer in a mass ratio of 1.
Test example 1
And (3) testing alkali resistance: the alkali-resistant strength retention rate of the glass-filled fibers obtained in examples 2 to 9 of the present invention was tested according to GB/T38143-2019 alkali-resistant glass-filled fibers for cement concrete and mortar.
The length of the test piece was 35mm. The sample was placed in an oven at 50 ℃ to dry for 1h. The tensile speed of the tensile testing machine was 1mm/min. For each example, 20 different samples were taken and tested, and the results averaged.
TABLE 1 alkali-resistant Strength Retention of glass-filled fibers
| Alkali-resistant Strength Retention (%) | |
| Example 2 | 82.2 |
| Example 3 | 77.5 |
| Example 4 | 89.0 |
| Example 7 | 94.8 |
| Example 8 | 97.5 |
| Example 9 | 98.4 |
The radius of the boron atom is 90pm, and the valence electronic structure is 2s2p, so that boron has the characteristics of high ionization energy, high electronegativity and easy formation of covalent bond molecules. According to the invention, boron oxide, silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, iron oxide and titanium dioxide are mixed to be used as sintering raw materials of glass fibers, so that the glass fibers with low thermal expansion coefficient, thermal shock resistance, heat resistance, corrosion resistance and high mechanical strength are obtained, and the glass fibers are used in the heat-insulating cement mortar and the preparation method thereof, so that the cement mortar with good heat-insulating property and strong alkali resistance is obtained. The polyurethane has good alkali resistance, and the amino groups contained in the aminosiloxane consisting of N- (3-acryloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane and the unique molecular weight and molecular configuration of the amino groups respectively enable the amino groups to be further connected with carbon-nitrogen bonds in the polyurethane after being grafted to the surface of the glass filling fiber together with the polyurethane, and the nitrogen elements contained in the amino groups and the polyurethane share an electron cloud to reduce the free energy of the glass filling fiber, so that the energy states of the glass filling fiber and the obtained cement tend to be lower in energy and more stable, and one of the performances is to improve the alkali resistance. The carbon-carbon double bonds contained in the two maleic anhydride polymers adopted by the invention are respectively in different molecular configurations, so that when the two maleic anhydride polymers are compounded for preparing the glass filling fiber, the crosslinking degree of polyurethane and the aminosiloxane is further enhanced, the energy state of a grafting group is improved, and the chemical resistance including alkali resistance of the glass filling fiber and the obtained cement is further enhanced.
Test example 2
And (3) testing the fireproof performance: the heat-insulating cement mortars obtained in examples 9 to 10 of the present invention were tested for their combustion rating according to GB 8624-2012 "grading of combustion properties of building materials and products".
The heat-insulating cement mortar obtained in the examples 9 to 10 of the invention is used for obtaining a block-shaped sample with the length of 10cm, the width of 10cm and the thickness of 2cm by a conventional pouring mode (the temperature of a pouring environment is 23 ℃ and the relative humidity is 50%). The heat insulation cement mortar is adjusted in an environment with the temperature of 23 ℃ and the relative humidity of 50% after the pouring is finished, and the total time from the beginning of pouring to the completion of the adjustment is 7d. For each example, 5 different samples were taken and tested, and the results averaged.
TABLE 2 fireproof Properties of Heat-insulating Cement mortars
| Grade of combustion | |
| Example 9 | A2 |
| Example 10 | A1 |
Test example 3
Testing the heat insulation performance: the thermal conductivity of the heat-insulating cement mortar obtained in examples 1 to 9 of the present invention was measured according to GB/T32064-2015 transient planar heat source test method for thermal conductivity and thermal diffusivity of construction materials, and the thermal conductivity was used as an index for measuring the heat-insulating ability.
The heat-insulating cement mortar obtained in the examples 1 to 9 of the invention is used for obtaining a block-shaped sample with the length of 10cm, the width of 10cm and the thickness of 2cm by a conventional pouring mode (the temperature of a pouring environment is 23 ℃ and the relative humidity is 50%). The heat insulation cement mortar is adjusted in an environment with the temperature of 23 ℃ and the relative humidity of 50% after the pouring is finished, and the total time from the beginning of pouring to the completion of the adjustment is 7d. The test environment temperature was 25 ℃ and the relative humidity was 55%. For each example, 5 different samples were taken and tested, and the results averaged.
TABLE 3 Heat insulating Properties of Heat insulating Cement mortar
| Thermal conductivity (W/(m.K)) | |
| Example 1 | 0.064 |
| Example 2 | 0.040 |
| Example 3 | 0.052 |
| Example 4 | 0.036 |
| Example 5 | 0.033 |
| Example 6 | 0.037 |
| Example 7 | 0.031 |
| Example 8 | 0.028 |
| Example 9 | 0.026 |
In the traditional preparation process of the glass fiber reinforced cement, glass reinforced fibers are directly added into a cement system, but because glass phases and minerals in the cement system have different lattice coefficients and different grain boundary energies, internal stress is easy to appear in the cement due to changes of conditions such as environmental temperature and humidity in the curing and subsequent service processes of an obtained cement product, the material is in a metastable state due to the existence of the internal stress, namely the material has a tendency of generating deformation phenomena including cracking and the like to release redundant internal stress, and the potential safety hazard is undoubtedly brought. Compared with PVC foaming materials, the polyurethane has better stability, chemical resistance, rebound resilience, mechanical strength and smaller compression deformation rate, and also has good heat insulation, sound insulation and earthquake resistance. Therefore, the invention utilizes the amino siloxane, acrylic acid and other raw materials to modify the surface of the obtained glass fiber with the polyurethane, so that the compatibility between the glass fiber and a cement system is enhanced by virtue of the molecular structure of the polyurethane, the stability of the cement is improved, the heat conductivity coefficient of the cement is reduced, and the heat insulation capability of the cement is improved. The aminosiloxane is amino contained in N- (3-acryloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane and the amino groups and the unique molecular weight and the unique molecular configuration of the amino groups respectively, so that the amino groups can be further connected with carbon nitrogen bonds in polyurethane after being grafted to the surface of the glass fiber, and nitrogen elements contained in the amino groups and the amino groups share an electron cloud, so that the crosslinking strength between the aminosiloxane and the polyurethane is further improved. The casein borate has good foaming capacity, and can be matched with coconut oleic acid diethanolamide to ensure that the heat-insulating cement mortar obtains a rich, fine and uniform foam structure. Because the air has high specific heat capacity and low heat conductivity coefficient, the existence of a large number of bubble cavities can obviously reduce the heat conductivity coefficient of the cement, and the heat preservation and insulation capacity of the cement is improved. And the amino group in the casein, the aminosiloxane and the polyurethane have higher affinity and compatibility because of containing nitrogen elements, the glass filling fiber added with the polyurethane group can enhance the foaming capacity of the casein borate, and the casein borate can also enhance the heat preservation, the heat insulation and the alkali resistance of the glass filling fiber, thereby generating unexpected technical effects. Moreover, the boron element in the casein borate adopted by the invention also forms a covalent bond with the boron element in the glass fiber, so that the whole cement material system has better stability, and unexpected technical effects are obtained. The polyacrylamide structural unit contains amide groups, hydrogen bonds are easy to form, and various modifiers with branched chains or net structures are easy to obtain in a grafting or crosslinking mode. According to the invention, polyacrylamide is used as one of cement dispersants, a large number of hydrogen bonds are generated among amide groups in the polyacrylamide, the aminosiloxane and the polyurethane, and a three-dimensional space network crosslinking relation with rich branched chains and high strength is further generated in the cement matrix with a rich fine foam honeycomb structure, so that the stability, the heat preservation and insulation property and the alkali resistance of the cement are improved. And the foaming capacity of the latter and the stability of the obtained foam are enhanced by the polyacrylamide and the casein borate, rich, fine, uniform and lasting foam is obtained, a honeycomb internal structure with good heat preservation and insulation performance is formed, and the heat-insulation cement mortar with better heat preservation and insulation performance is obtained. The benzene structure in the styrene-maleic anhydride random copolymer and the long carbon chain in the polymer of castor oil and maleic anhydride can enhance the compatibility between the glass filling fiber and the nonpolar groups in the coconut diethanolamide and the polyethylene glycol monoallyl ether, so that the dispersity of the obtained glass filling fiber in a cement matrix is modified, the agglomeration phenomenon possibly caused by introducing polyurethane is avoided, the mortar obtains a more uniform and isotropic structure after curing, and the internal stress and even damage deformation possibly generated along with the change of external conditions including temperature, humidity, pressure and the like in the subsequent service process are avoided. The carbon-carbon double bonds contained in the two maleic anhydride polymers are respectively in different molecular configurations, so that when the two maleic anhydride polymers are compounded for preparing the glass filling fiber, the crosslinking complexity of polyurethane and the aminosiloxane is further enhanced, the compatibility between the glass filling fiber and a cement system is improved by improving the energy state of a grafting group, the dispersion condition of the glass filling fiber is improved, the mortar obtains a more uniform and isotropic structure after curing, abundant, fine, uniform and durable foam is obtained, a honeycomb internal structure with good heat insulation performance is formed, the heat insulation cement mortar with better heat insulation performance is obtained, and unexpected technical effects are obtained.
Claims (5)
1. The preparation method of the heat insulation cement mortar is characterized by comprising the following steps: mixing 85-115 parts by weight of limestone, 40-62 parts by weight of modified mineral aggregate, 21-27 parts by weight of silicon powder, 5-13 parts by weight of glass filling fiber, 7-13 parts by weight of polyethylene glycol trimethoxy silicon propyl ether, 1-5 parts by weight of foaming agent, 1-5 parts by weight of dispersing agent and 130-155 parts by weight of water at 20-30 ℃, and then stirring at the rotating speed of 80-100rpm for 20-35min to obtain the heat-insulating cement mortar;
the preparation method of the modified mineral aggregate comprises the following steps:
adding mineral aggregate into 10-30wt% of nitric acid water solution according to the solid-to-liquid ratio of 1kg (3-6) L, and soaking for 1-3h, wherein the mineral aggregate is a mixture of kaolin, diatomite and talcum powder according to the mass ratio of (1-10) to (1-6) to (2-5); filtering, washing with water to neutrality, drying at 50-70 deg.C for 5-10 hr, pulverizing, and sieving with 100-300 mesh sieve to obtain pretreated mineral aggregate; mixing 3-aminopropyltriethoxysilane, tris (trimethylsilyl) phosphite ester and the pretreated mineral aggregate according to the mass ratio of (1-3) to (3-6) to (60-80), and stirring at the rotating speed of 700-1000rpm for 2-5h to obtain the modified mineral aggregate;
the preparation method of the glass filling fiber comprises the following steps:
f1, mixing silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, iron oxide, titanium dioxide and boron oxide according to the mass ratio of (58-63.2): (10.4-12.7): (21.5-25.8): (1.1-3.2): (0.1-0.7): (0.2-0.9): 0.3-1) at 20-30 ℃, putting into a planetary ball mill, and carrying out ball milling at the rotating speed of 300-500rpm for 5-8h, wherein the material of a grinding ball is sintered corundum, and the ball-material ratio is (12-15): 1 to obtain a prefabricated material;
f2, under the protection of nitrogen, smelting the prefabricated material at 1640-1645 ℃ for 2.5-4h, and then putting the prefabricated material into a wire drawing machine to draw wires at a wire drawing speed of 90-110m/min to obtain glass wires with the diameter of 8-10 mu m;
f3, homogenizing polyurethane, aminosiloxane, acrylic acid and water according to the mass ratio of (1-1.4): 3.5-4): 2.5-3): 4-6 at 48-55 ℃ and the rotating speed of 4000-5000rpm for 10-20min to obtain finishing milk;
f4, mixing the glass fiber, the finishing emulsion and the maleic anhydride polymer according to the mass ratio of (4.5-5.5) to (7.5-9) to (0.75-0.9), carrying out ultrasonic auxiliary reaction at 79-83 ℃ with the frequency of 38-42kHz and the power of 300-330W for 230-280min, washing filter residue with water at the temperature of 43-48 ℃ and the flow rate of 1-2L/min for 10-15min after filtering, and then washing the filter residue with water at the temperature of 75-80 ℃ and the air volume of 6000-7000m 3 Hot air drying for 2-3h under the working condition of/h to obtain the glass filling fiber; the aminosiloxane is a mixture of N- (3-acryloyloxy-2-hydroxypropyl) -3-aminopropyltriethoxysilane, 3- (3-aminophenoxy) propyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane; the maleic anhydride polymer is a mixture of a styrene-maleic anhydride random copolymer, castor oil and a polymer of maleic anhydride.
2. The method for preparing heat-insulating cement mortar of claim 1, wherein: the foaming agent is at least one of a vegetable protein foaming agent, an animal protein foaming agent, coconut diethanolamide and casein borate.
3. The method for preparing heat-insulating cement mortar of claim 1, wherein: the dispersant is at least one of alkali lignin, polyethylene glycol monoallyl ether and polyacrylamide.
4. Heat-insulating cement mortar, its characterized in that: the method according to any one of claims 1 to 3.
5. Use of the heat-insulating cement mortar according to claim 4 in construction of a building wall.
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