Heat preservation foaming agent, low-cost homogeneous self-heat-preservation material and application of low-cost homogeneous self-heat-preservation material

Abstract

The invention provides a thermal insulation foaming agent, a low-cost homogeneous self-thermal insulation material and application thereof, and belongs to the technical field of civil engineering. The thermal insulation foaming agent provided by the invention comprises the following components in percentage by mass: 15-20% of a surfactant, 15-20% of a foam stabilizer, 40-60% of a thermal insulation agent and 15-20% of a reinforcing agent, the foam stabilizer is coal gangue powder combustion residues; the heat preservation agent is aerogel. After the foaming agent is added into the homogeneous self-thermal-insulation material, the mechanical property and thermal insulation property of the homogeneous self-thermal-insulation material can be simultaneously improved macroscopically, microscopically and microscopically, so that the homogeneous self-thermal-insulation material meets the three technical indexes that the heat conductivity coefficient is smaller than or equal to 0.12 W / (m.K), the compressive strength is larger than or equal to 5 MPa and the dry density is smaller than or equal to 900 kg / m < 3 >; compared with EPS particles with the same mass, the cost of the homogeneous self-insulation material can be reduced by 10%.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and in particular to a thermal insulation foaming agent and a low-cost homogeneous self-insulating material and applications thereof. Background Art

[0002] Homogeneous self-insulating materials refer to materials with self-insulating properties that are produced by raw materials themselves or by combining other existing insulation materials.

[0003] Homogeneous self-insulating materials are suitable for non-load-bearing external infill walls, achieving energy-saving regulatory requirements through the masonry wall itself. The homogeneous self-insulating material is made entirely of inorganic materials, achieving Class A fire protection. Furthermore, by filling the insulating aggregates with EPS granules, the entire masonry unit is compact and dense, creating a one-piece structure that eliminates thermal bridges within the masonry, ultimately achieving energy savings of over 75% and preventing water seepage.

[0004] At present, the homogeneous self-insulating materials on the market all use a large amount of EPS particles (expanded polystyrene foam particles) to foam cement to achieve the thermal insulation performance of the homogeneous self-insulating materials. However, although the addition of EPS particles can make it have good thermal insulation performance, it will cause its compressive strength to decrease, resulting in the homogeneous self-insulating materials being unable to simultaneously meet the requirements of thermal conductivity ≤ 0.12W / (m·K), compressive strength ≥ 5MPa and dry density ≤ 900kg / m 3 These three technical indicators, together with the high cost of EPS particles, lead to high manufacturing costs for homogeneous self-insulating materials, making them less competitive in the market.

[0005] Therefore, how to make the homogeneous self-insulating material meet the above three technical indicators while reducing its production cost has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0006] The purpose of the present invention is to provide a thermal insulation foaming agent and a low-cost homogeneous self-insulating material and its application. The homogeneous self-insulating material prepared by the thermal insulation foaming agent provided by the present invention not only meets the requirements of thermal conductivity ≤ 0.12W / (m·K), compressive strength ≥ 5MPa and dry density ≤ 900kg / m 3 These three technical indicators also have lower production costs.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides a heat-insulating foaming agent, which comprises, by mass percentage, 15-20% of a surfactant, 15-20% of a foam stabilizer, 40-60% of a heat-insulating agent, and 10-16% of a reinforcing agent;

[0009] The foam stabilizer is the combustion residue of coal gangue powder; and the heat preservation agent is aerogel.

[0010] Preferably, the surfactant includes any one or two of alkyl glycoside (APG), saponin, fatty alcohol polyoxyethylene ether, α-olefin sulfonate (AOS), fatty alcohol polyoxyethylene ether sulfate (AES), fatty alcohol polyoxyethylene ether carboxylate (AEC), soapberry saponin, betulin (betulin), lupeol, γ-sitosterol, betaine, cocamide acetate, palmitamidopropyl diethylamine, oenotheinamide and cocamide.

[0011] Preferably, the heat-insulating agent is silicon-based aerogel.

[0012] Preferably, the reinforcing agent is cellulose.

[0013] The present invention provides a low-cost homogeneous self-insulating material, which uses the thermal insulation foaming agent described in the above technical solution as a foaming agent.

[0014] Preferably, the method for preparing the low-cost homogeneous self-insulating material comprises the following steps:

[0015] (1) mixing a foaming agent and water to obtain a foaming liquid;

[0016] (2) mixing a water reducer, cement, fly ash, and water, and then adding EPS particles to obtain a slurry;

[0017] (3) mixing the slurry obtained in step (2) and the foaming liquid obtained in step (1) to obtain a mixture, and then sequentially pouring and curing the mixture to obtain a low-cost homogeneous self-insulating material;

[0018] The preparation of step (1) and step (2) can be performed in no particular order.

[0019] Preferably, the mass ratio of cement, fly ash, water and water reducing agent in the mixture of step (3) is (150-350):(400-650):(100-220):(0.3-1.2).

[0020] Preferably, the mass ratio of cement, fly ash and water reducer in the mixture of step (3) is (150-350):(400-650):(0.3-1.2).

[0021] Preferably, the curing temperature in step (3) is 20±2° C., the curing relative humidity is ≥95%, and the curing time is ≥20 h.

[0022] The present invention provides the application of the low-cost homogeneous self-insulating material described in the above technical solution in the field of civil engineering.

[0023] The present invention provides a thermal insulation foaming agent, which comprises, by mass percentage, 15-20% of a surfactant, 15-20% of a foam stabilizer, 40-60% of a thermal insulation agent and 10-16% of an enhancer; the foam stabilizer is a residue from the combustion of coal gangue powder; and the thermal insulation agent is an aerogel. In the present invention, the surfactant can adjust the surface / interfacial tension of the system, thereby forming bubbles during the stirring process, and can form a closed void structure after being added to a homogeneous self-insulating material, thereby reducing the thermal conductivity of the homogeneous self-insulating material; the residue from the combustion of coal gangue powder has a microscopic size and a porous structure, and has a low thermal conductivity, which can reduce the thermal conductivity of the insulation material, thereby improving the thermal insulation performance of the insulation material; the particles in the aerogel are nano-sized, which can greatly improve the density of the insulation material, thereby reducing its thermal conductivity, and making the insulation material have higher thermal insulation performance; the enhancer can make the foaming agent The foaming agent improves the mechanical properties of the homogeneous self-insulating material and has a foam stabilizing effect, thereby ensuring that the insulation material has both high thermal insulation and high strength properties. At the same time, after the foaming agent is added to the homogeneous self-insulating material, the aerogel and coal gangue powder combustion residues can form a good synergistic effect with the aggregate (such as fly ash, etc.) in the homogeneous self-insulating material from different scales, thereby improving the mechanical properties and thermal insulation properties of the homogeneous self-insulating material at the macro, micro and meso levels, thereby making the homogeneous self-insulating material meet the requirements of thermal conductivity ≤0.12W / (m·K), compressive strength ≥5MPa and dry density ≤900kg / m 3 The cost of each component of the foaming agent used in the present invention is relatively low, and compared with EPS particles of the same quality, the cost can be reduced by 10%, which significantly improves the market competitiveness of the homogeneous self-insulating material. DETAILED DESCRIPTION

[0024] The invention provides a heat-insulating foaming agent, which comprises, by mass percentage, 15-20% of a surfactant, 15-20% of a foam stabilizer, 40-60% of a heat-insulating agent and 10-16% of an enhancer.

[0025] By mass percentage, the heat-insulating foaming agent provided by the present invention includes 15 to 20% of a surfactant. In the present invention, the surfactant preferably includes alkyl glycoside (APG), saponin, fatty alcohol polyoxyethylene ether, α-olefin sulfonate (AOS), fatty alcohol polyoxyethylene ether sulfate (AES), fatty alcohol polyoxyethylene ether carboxylate (AEC), soapberry saponin, betulin (betulin), lupeol, γ-sitosterol, betaine, coconut amine acetate, palmitamidopropyl diethylamine, oenotheinamide and cocamide any one or two; the fatty alcohol polyoxyethylene ether sulfate is preferably fatty alcohol polyoxyethylene ether sodium sulfate; the fatty alcohol polyoxyethylene ether carboxylate is preferably fatty alcohol polyoxyethylene ether sodium carboxylate. The present invention can adjust the surface / interfacial tension of the system by adding a surfactant, thereby forming stable bubbles.

[0026] As an embodiment of the present invention, the mass percentage of the surfactant can be 15%, 16%, 17%, 18%, 19% or 20%.

[0027] The thermal insulation foaming agent provided herein comprises 15-20% by mass of a foam stabilizer. In the present invention, the foam stabilizer is the residue from the combustion of coal gangue powder. The particle size of the residue from the combustion of coal gangue powder is preferably 10-80 μm. In the present invention, the residue from the combustion of coal gangue powder has a microscopic size and a porous structure, resulting in a low thermal conductivity. This can reduce the thermal conductivity of the insulation material, thereby improving the thermal insulation performance of the homogeneous self-insulating material.

[0028] As an embodiment of the present invention, the mass percentage of the foam stabilizer can be 15%, 16%, 17%, 18%, 19% or 20%.

[0029] The thermal insulation foaming agent provided by the present invention comprises 40-60% by mass of a thermal insulation agent. In the present invention, the thermal insulation agent is an aerogel, preferably a silica-based aerogel; the silica-based aerogel is preferably hydrophilic silica-based aerogel; and the silica-based aerogel preferably has a particle size of 20-500 nm. In the present invention, the nanosized particles in the aerogel can significantly increase the density of the thermal insulation material, thereby reducing its thermal conductivity and providing a homogeneous self-insulating material with higher thermal insulation performance.

[0030] As an embodiment of the present invention, the mass percentage of the heat preservation agent can be 40%, 45%, 50%, 55% or 60%.

[0031] The thermal insulation foaming agent provided herein comprises 10-16% by mass of a reinforcing agent. In the present invention, the reinforcing agent is preferably cellulose, more preferably methyl cellulose or carboxymethyl cellulose; the molecular weight of the cellulose is preferably 50,000 to 220,000. In the present invention, the reinforcing agent can enhance the mechanical properties of the homogeneous self-insulating material while also stabilizing the foam, thereby ensuring that the insulating material has both high thermal insulation and high strength properties.

[0032] As an embodiment of the present invention, the mass percentage of the enhancer can be 10%, 11%, 12%, 13%, 14%, 15% or 16%; the molecular weight of the cellulose can be 50,000, 100,000, 150,000, 200,000 or 220,000.

[0033] In the present invention, the surfactant can adjust the surface / interfacial tension of the system, thereby forming bubbles during the stirring process, and can form a closed void structure after being added to the homogeneous self-insulating material, thereby reducing the thermal conductivity of the homogeneous self-insulating material; the combustion residue of coal gangue powder has a microscopic size and a porous structure, and has a low thermal conductivity, which can reduce the thermal conductivity of the insulation material, thereby improving the insulation performance of the insulation material; the particles in the aerogel are nano-sized, which can greatly improve the density of the insulation material, thereby reducing its thermal conductivity, and making the insulation material have higher insulation performance; the reinforcing agent can make the aerogel have a micro-sized particle size ... reinforcing agent have a micro-sized particle size, which can The foaming agent improves the mechanical properties of the homogeneous self-insulating material and has a foam stabilizing effect, thereby ensuring that the insulation material has both high thermal insulation and high strength properties. At the same time, after the foaming agent is added to the homogeneous self-insulating material, the aerogel and coal gangue powder combustion residues can form a good synergistic effect with the aggregate (such as fly ash, etc.) in the homogeneous self-insulating material from different scales, thereby improving the mechanical properties and thermal insulation properties of the homogeneous self-insulating material at the macro, micro and meso levels, thereby making the homogeneous self-insulating material meet the requirements of thermal conductivity ≤0.12W / (m·K), compressive strength ≥5MPa and dry density ≤900kg / m 3 The cost of each component of the foaming agent used in the present invention is relatively low, and compared with EPS particles of the same quality, the cost can be reduced by 10%, which significantly improves the market competitiveness of the homogeneous self-insulating material.

[0034] The present invention also provides a low-cost homogeneous self-insulating material, which uses the thermal insulation foaming agent described in the above technical solution as a foaming agent.

[0035] In the present invention, the method for preparing the low-cost homogeneous self-insulating material preferably comprises the following steps:

[0036] (1) mixing a foaming agent and water to obtain a foaming liquid;

[0037] (2) mixing a water reducer, cement, fly ash, and water, and then adding EPS particles to obtain a slurry;

[0038] (3) mixing the slurry obtained in step (2) and the foaming liquid obtained in step (1) to obtain a mixture, and then sequentially pouring and curing the mixture to obtain a low-cost homogeneous self-insulating material;

[0039] The preparation of step (1) and step (2) can be performed in no particular order.

[0040] In the present invention, the foaming agent and water are preferably mixed to obtain a foaming liquid.

[0041] The present invention has no special limitation on the amount of the foaming agent and water, as long as the foaming agent is fully dispersed in the water and has a good foaming effect.

[0042] In the present invention, the foaming agent and water are preferably mixed by first mixing the surfactant and water, and then adding a foam stabilizer, a heat-insulating agent, and an enhancer to obtain a foaming liquid. In the present invention, the foaming agent and water are preferably mixed under stirring; the stirring rate is preferably 15 to 50 r / min, more preferably 20 to 30 r / min. The present invention does not have any particular restrictions on the mixing time, as long as the components in the foaming agent are fully dissolved or evenly mixed. By adopting the above-mentioned mixing method, the present invention can achieve a better foaming effect.

[0043] In the present invention, the water reducer is preferably a polycarboxylate water reducer; the cement is preferably Portland cement, more preferably 42.5 grade Portland cement; and the fly ash is preferably first-grade fly ash or second-grade fly ash. The present invention does not particularly limit the specific sources of the water reducer, cement, and silicate; commercially available products familiar to those skilled in the art may be used.

[0044] In the present invention, the mixing of the water reducing agent, cement, fly ash and water is preferably carried out in a mixer. The present invention has no particular limitation on the specific model of the mixer, and commercially available products well known to those skilled in the art can be used.

[0045] In the present invention, the water reducer, cement, fly ash, and water are preferably mixed by adding the water reducer, cement, and fly ash to water and then stirring. The stirring rate is preferably 30 to 100 r / min, more preferably 50 to 60 r / min. The stirring method is preferably clockwise for 2 to 5 minutes, followed by counterclockwise for 2 to 5 minutes. This mixing method allows for a more uniform mixing of the cement, fly ash, and water.

[0046] In the present invention, the EPS particles are preferably expanded first and then added to the mixture of water reducer, cement, fly ash and water. The present invention does not specifically limit the expansion method, and any expansion method known to those skilled in the art can be used.

[0047] In the present invention, the resulting mixture is preferably stirred after the EPS particles are added. In the present invention, the stirring rate is preferably 30 to 100 r / min, more preferably 50 to 60 r / min. The stirring method is preferably clockwise for 2 to 5 minutes, followed by counterclockwise for 2 to 5 minutes. By controlling the stirring rate and method, the present invention can achieve a more uniform mixing of the components.

[0048] After obtaining the foaming liquid and the slurry, the present invention preferably mixes the slurry and the foaming liquid to obtain a mixture, and then sequentially casts and cures the mixture to obtain a low-cost homogeneous self-insulating material.

[0049] In the present invention, the slurry and the foaming liquid are preferably mixed by injecting the foaming liquid into the slurry using a foaming machine, and then stirring and mixing. In the present invention, the power of the foaming machine is preferably 600-900W, more preferably 750-800W; the stirring and mixing rate is preferably 5-10r / min, more preferably 7-8r / min; the stirring and mixing method is preferably to stir clockwise for 1-2 minutes, and then stir counterclockwise for 1-2 minutes. The present invention has no special limitation on the specific source of the foaming machine, and a commercially available foaming machine familiar to those skilled in the art can be used. The present invention adopts the above-mentioned method for mixing, and under the action of the foaming machine, a large number of bubbles can be formed inside the foaming liquid, and then after mixing with the slurry, a large number of closed pores can be formed inside the thermal insulation material, thereby improving the thermal insulation performance of the self-insulating material.

[0050] In the present invention, the mass ratio of cement, fly ash, water, and water reducer in the mixture is preferably (150-350):(400-650):(100-220):(0.3-1.2). As an embodiment of the present invention, the mass ratio of cement, fly ash, water, and water reducer can be (180-300):(450-600):(120-200):(0.5-1.0), or (200-250):(500-580):(140-165):(0.65-0.8), or even 237:553:158:0.79. The present invention lays the foundation for the self-insulating material to have good mechanical properties by controlling the relationship between the amounts of cement, fly ash, water, and water reducer.

[0051] In the present invention, the mass ratio of cement, foaming agent and EPS particles in the mixture is preferably (150-350): (0.8-1.2): (3.5-8). As an embodiment of the present invention, the mass ratio of cement, foaming agent and EPS particles can be (180-300): (0.9-1.2): (4-7.44), or (200-250): (1-1.2): (4.5-6.5), or even 237: (1-1.1): (4.96-6.2). The present invention can control the thermal insulation performance and mechanical properties of the homogeneous self-insulating material by controlling the dosage relationship of cement, foaming agent and EPS particles, thereby obtaining a material that simultaneously satisfies the requirements of a thermal conductivity of less than 0.12W / (m·K), a compressive strength of 5MPa and a dry density of 800kg / m 3 The following three technical indicators of homogeneous self-insulating materials can effectively reduce the cost of homogeneous self-insulating materials.

[0052] The present invention has no special limitation on the pouring method, and the material can be poured directly into the template.

[0053] The present invention preferably further comprises curing the cast product. In the present invention, the curing temperature is preferably 20±2°C; the curing relative humidity is preferably ≥95%; and the curing time is preferably ≥20 hours, more preferably 24 hours.

[0054] In the homogeneous self-insulating material provided by the present invention, a foaming agent is used to replace part of the EPS particles, which not only can improve the strength and dry density of the homogeneous self-insulating material without affecting its thermal insulation performance, but also the cost of the foaming agent is lower, and the cost of the admixture can be reduced to 1 / 3 of the original, thereby significantly improving the market competitiveness of the homogeneous self-insulating material.

[0055] The present invention also provides the application of the low-cost homogeneous self-insulating material described in the above technical solution in the field of civil engineering.

[0056] The present invention has no particular limitation on the specific manner of application, and any application manner familiar to those skilled in the art may be used.

[0057] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0058] Example 1

[0059] A heat-insulating foaming agent, comprising, by mass percentage, 20% surfactant, 20% foam stabilizer, 40% heat-insulating agent and 20% enhancer;

[0060] The surfactant is sodium lauryl sulfate; the foam stabilizer is the combustion residue of coal gangue powder with a particle size of 10 to 80 μm; the heat preservation agent is hydrophilic silicon-based aerogel with a particle size of 20 to 500 nm; and the enhancer is methyl cellulose with a molecular weight of 200,000.

[0061] Example 2

[0062] A thermal insulation foaming agent, which comprises, by mass percentage, 18% of a surfactant, 18% of a foam stabilizer, 50% of a thermal insulation agent, and 14% of an enhancer;

[0063] The surfactant is sodium lauryl sulfate; the foam stabilizer is the combustion residue of coal gangue powder with a particle size of 10 to 80 μm; the heat preservation agent is hydrophilic silicon-based aerogel with a particle size of 20 to 500 nm; and the enhancer is methyl cellulose with a molecular weight of 200,000.

[0064] Example 3

[0065] A thermal insulation foaming agent comprises, by mass percentage, 14% of a surfactant, 14% of a foam stabilizer, 60% of a thermal insulation agent, and 12% of an enhancer. Other conditions are the same as those in Example 1.

[0066] The surfactant is sodium lauryl sulfate; the foam stabilizer is the combustion residue of coal gangue powder with a particle size of 10 to 80 μm; the heat preservation agent is hydrophilic silicon-based aerogel with a particle size of 20 to 500 nm; and the enhancer is methyl cellulose with a molecular weight of 200,000.

[0067] Application Example 1

[0068] A low-cost homogeneous self-insulating material is prepared by using the thermal insulation foaming agent of Example 2 as a raw material.

[0069] (1) First, a surfactant and water are mixed and stirred with a glass rod until the surfactant is dissolved. Then, a foam stabilizer, a heat-insulating agent and an enhancer are added and stirred with a glass rod until uniform to obtain a foaming liquid; the stirring rate is 20 r / min;

[0070] (2) Add water to the mixer, then add cement and fly ash, stir clockwise for 5 minutes, then stir counterclockwise for 5 minutes, then add a 15kg / m 3 EPS particles are stirred clockwise for 5 minutes and then counterclockwise for 5 minutes to obtain a slurry; the cement is 42.5 grade Portland cement and the fly ash is first grade fly ash; the stirring rate is 50 r / min;

[0071] (3) injecting the foaming liquid obtained in step (1) into the slurry obtained in step (2) by using a foaming machine, and then stirring and mixing, and obtaining a low-cost homogeneous self-insulating material after pouring; the power of the foaming machine is 800W; the stirring and mixing rate is 10r / min, and the stirring and mixing method is first stirring clockwise for 2 minutes, and then stirring counterclockwise for 2 minutes.

[0072] Application Examples 2-3

[0073] A low-cost homogeneous self-insulating material. The amount of raw materials is shown in Table 2. Other conditions are the same as those in Application Example 1.

[0074] Comparative Application Examples 1 to 3

[0075] A homogeneous self-insulating material, the amounts of raw materials are shown in Table 2, and the preparation method is the same as that of Application Example 1.

[0076] The performance of the homogeneous self-insulating materials obtained from Examples 1 to 3 and Comparative Examples 1 to 3 was tested, and the results are shown in Table 1:

[0077] Table 1 Properties of the homogeneous self-insulating materials obtained from application examples 1 to 3 and comparative application examples 1 to 3

[0078] Thermal conductivity / W / (m·K) Compressive strength / MPa <![CDATA[Dry density / kg / m 3 > Comparative Application Example 1 0.113 5.3 785 Comparative Application Example 2 0.102 5.4 786 Comparative Application Example 3 0.096 5.4 786 Application Example 1 0.106 5.5 789 Application Example 2 0.114 5.6 791 Application Example 3 0.118 5.7 795

[0079] In Table 1, the test standard for thermal conductivity is GB / T13475 Determination of adiabatic steady-state heat transfer properties and the guarded hot box method;

[0080] The test standard for compressive strength is GBT4111-2013 Test methods for concrete blocks and bricks;

[0081] The test standard for dry density is Xinjiang Standard XJJ109-2019 "Technical Standard for Application of Self-Insulating Blocks".

[0082] The prices of the homogeneous self-insulating materials obtained in Application Examples 1 to 3 and Comparative Application Examples 1 to 3 are shown in Table 2:

[0083] Table 2 Prices of homogeneous self-insulating materials obtained from application examples 1 to 3 and comparative application examples 1 to 3

[0084]

[0085] From the comparison of Table 1 and Table 2, it can be seen that by using the foaming agent provided by the present invention as a raw material, even after reducing the amount of EPS particles, the homogeneous self-insulating material can still be ensured not to be affected, and the cost of the homogeneous self-insulating material can be reduced by more than 10%.

[0086] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A thermal insulation foaming agent, comprising, by mass percentage, 15-20% of a surfactant, 15-20% of a foam stabilizer, 40-60% of a thermal insulation agent, and 10-16% of a reinforcing agent; The foam stabilizer is the combustion residue of coal gangue powder; and the heat preservation agent is aerogel.

2. The thermal insulation foaming agent according to claim 1, characterized in that The surfactant includes any one or two of alkyl glycoside (APG), saponin, fatty alcohol polyoxyethylene ether, α-olefin sulfonate (AOS), fatty alcohol polyoxyethylene ether sulfate (AES), fatty alcohol polyoxyethylene ether carboxylate (AEC), soapberry saponin, betulin (betulin), lupeol, γ-sitosterol, betaine, cocamide acetate, palmitamidopropyl diethylamine, oenotheinamide and cocamide.

3. The thermal insulation foaming agent according to claim 1, characterized in that The heat preservation agent is silicon-based aerogel.

4. The thermal insulation foaming agent according to claim 1, characterized in that The reinforcing agent is cellulose.

5. A low-cost homogeneous self-insulating material, using the thermal insulation foaming agent according to any one of claims 1 to 4 as a foaming agent.

6. The low-cost homogeneous self-insulating material according to claim 5, characterized in that: The method for preparing the low-cost homogeneous self-insulating material comprises the following steps: (1) mixing a foaming agent and water to obtain a foaming liquid; (2) mixing a water reducer, cement, fly ash, and water, and then adding EPS particles to obtain a slurry; (3) mixing the slurry obtained in step (2) and the foaming liquid obtained in step (1) to obtain a mixture, and then sequentially pouring and curing the mixture to obtain a low-cost homogeneous self-insulating material; The preparation of step (1) and step (2) is not in any particular order.

7. The low-cost homogeneous self-insulating material according to claim 6, characterized in that: The mass ratio of cement, fly ash, water and water reducing agent in the mixture of step (3) is (150-350): (400-650): (100-220): (0.3-1.2).

8. The low-cost homogeneous self-insulating material according to claim 6, characterized in that: The mass ratio of cement, fly ash and water reducing agent in the mixture of step (3) is (150-350): (400-650): (0.3-1.2).

9. The low-cost homogeneous self-insulating material according to claim 6, characterized in that: The curing temperature in step (3) is 20±2° C., the curing relative humidity is ≥95%, and the curing time is ≥20 h.

10. Use of the low-cost homogeneous self-insulating material according to any one of claims 5 to 9 in the field of civil engineering.

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