High-strength heat-insulation aerogel magnesite cement tile, preparation method and application

Abstract

The invention relates to a high-strength heat-insulation aerogel magnesite cement tile, which is prepared from the following raw materials in parts by weight: 100 to 110 parts of magnesium oxide, 50 to 60 parts of magnesium chloride, 35 to 55 parts of water, 25 to 35 parts of silicon oxide aerogel, 1 to 5 parts of short glass fibers, 0.5 to 2 parts of foaming agents and 0.2 to 0.8 part of stabilizing agents. The preparation method comprises the following steps: mixing magnesium chloride with water, and stirring by using a stirrer to form brine; adding magnesium oxide into the brine, and stirring to prepare a mixture; a foaming machine is used for mixing a foaming agent, a stabilizer and air for foaming; adding the foam into the mixture, and then adding the silicon oxide aerogel; finally, adding short glass fibers to prepare slurry, pouring the prepared slurry into a mold for molding, and curing after molding to obtain a finished product. The heat conductivity coefficient of the obtained product is greatly reduced on the premise of ensuring sufficient mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline thermal insulation, and in particular to a high-strength thermal insulation aerogel magnesia cement tile, a preparation method and application thereof. Background Art

[0002] Driven by national policies, various industries have placed higher demands on energy conservation and thermal insulation. Pipeline insulation, as a key area for energy conservation and consumption reduction, has received increasing attention. To improve the overall energy-saving effects of pipeline insulation, not only the straight pipe sections need to be insulated, but also flanges, elbows, and pipe supports, which are prone to heat leakage, are particularly important. Pipe supports, in particular, suffer from the extremely high thermal conductivity of traditional metal materials, which causes severe heat leakage and severely impacts the overall energy efficiency of the pipeline. While adding ceramic fiber and other insulation pads can provide some insulation benefits, they fall far short of meeting the current high energy conservation and consumption reduction requirements. Therefore, the pipeline insulation industry urgently needs a tile material that combines high strength with efficient thermal insulation.

[0003] Magnesium cement (also known as magnesium oxychloride cement or Sorel cement) is a cementitious material formed by the reaction of magnesium oxide (MgO) and magnesium chloride (MgCl2) solutions. It offers advantages such as high compressive and flexural strength (≥50 MPa), low density (≤2.1 g / cm³, over 30% lighter than traditional cement), high temperature resistance (≥1000°C), high fire rating (A1), strong corrosion resistance, and a fast setting time, making it suitable for use in pipe insulation tiles. However, the thermal conductivity of magnesia cement is >0.1 W / (m·K), significantly lower than other insulation materials (rock wool has a thermal conductivity of 0.045 W / (m·K) and aerogel coating has a thermal conductivity of 0.035 W / (m·K)), and it still cannot solve the serious heat leakage problem. In order to further improve the thermal insulation performance of magnesite cement, it can be treated by adding fillers such as hollow glass microspheres, polystyrene particles, and aerogel particles. Among them, aerogel particles have the advantages of low thermal conductivity, low density, high fire resistance, and strong anti-aging ability. They are the preferred material for preparing high-strength thermal insulation aerogel magnesite cement tiles.

[0004] Patent CN 113149485 B discloses a "method for preparing chloropropylene emulsion-modified magnesium phosphate cement." This method combines materials such as aerogel with magnesium phosphate cement, using aerogel as a water-solidifying component in the system to rapidly repair cement roads without wasting raw materials, significantly improving construction efficiency and significantly saving production costs. However, this patent does not examine how aerogel particles can enhance the thermal insulation properties of magnesium phosphate cement. Patent CN 109467355 A discloses a "method for preparing lightweight concrete containing aerogel." This method introduces new materials to improve the slurry foaming and forming processes of lightweight concrete, reducing waiting time during production and improving production efficiency. However, it still does not disclose the thermal insulation effect of aerogel on the new system. Furthermore, lightweight concrete and magnesite cement are different systems, resulting in significant differences in preparation process and performance. The article "Preparation of Magnesium Oxychloride Cement-Based Composite Insulation Materials and Research on Their Performance in Heating Practice" points out that the addition of hydrophobic SiO2 aerogel into cement slurry can effectively reduce the thermal conductivity of the material. When the addition ratio is 1.5wt%, the thermal conductivity can reach 0.05 W / (m·K), but the mechanical properties are greatly reduced (compressive strength is 0.6MPa). The reduction in thermal conductivity will cause a significant decrease in mechanical properties, making it impossible to achieve the integration of high-efficiency thermal insulation performance and excellent mechanical properties, and unable to play a supporting role for the pipeline.

[0005] Based on this, how to greatly reduce the thermal conductivity of the product while ensuring sufficient mechanical properties is an urgent problem to be solved. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the present invention provides a high-strength thermal insulation aerogel magnesia cement tile, a preparation method and an application thereof.

[0007] In a first aspect, the present invention provides a high-strength thermal insulation aerogel magnesia cement tile comprising the following raw materials in parts by weight: 100-110 parts of magnesium oxide, 50-60 parts of magnesium chloride, 35-55 parts of water, 25-35 parts of silica aerogel, 1-5 parts of short glass fiber, 0.5-2 parts of foaming agent, and 0.2-0.8 parts of stabilizer.

[0008] Preferably, the active content of magnesium oxide is greater than 85%.

[0009] Preferably, the density of silica aerogel is 110-180 Kg / m 3, the particle size of silica aerogel particles is 80-100 μm. If the density of aerogel particles is too high, the specific surface area and porosity of the aerogel particles will be reduced, thereby affecting the thermal conductivity of the aerogel. If the density of aerogel particles is too low, the mixing difficulty and dispersion uniformity of aerogel and magnesia cement will be increased. In addition, aerogel particles with a higher density also reduce the cost of the product and improve the market competitiveness of the product, so it is particularly important to control the density of aerogel particles within a reasonable range. The size of aerogel particles is also a key factor affecting product performance. Reasonable control of the size of aerogel particles allows them to be distributed in the foam, significantly improving the thermal insulation performance of the composite material. Aerogel particles that are too large or too small are difficult to enter the pores of the foam, resulting in incompatibility between the foam and the aerogel particles, and the inability to achieve a synergistic effect of thermal insulation.

[0010] Preferably, the contact angle of silica aerogel is 100-140°. Hydrophilic aerogels in aqueous magnesia cement systems can cause structural collapse, resulting in loss of thermal insulation properties. Excessively hydrophobic aerogels in aqueous systems present difficulties with dispersion and easy agglomeration, leading to uneven dispersion of aerogel particles and heat leakage. This also limits the amount of aerogel particles added, making it difficult to produce products with high thermal insulation properties. Selecting silica aerogels with a contact angle of 100-140° can produce products with high thermal insulation properties.

[0011] Preferably, the length of the short glass fibers is 0.3-1 mm. If the fiber length of the short glass fibers is too long, the thermal conductivity coefficient will increase significantly, affecting the thermal insulation effect of the product, while if the fiber length is too short, it will not have a certain reinforcing effect.

[0012] Preferably, the foaming agent is an animal protein foaming agent, which can be a collagen foaming agent or a bone collagen foaming agent. The animal protein foaming agent has the characteristics of good foam stability, uniform pore size, environmental protection and non-toxicity. In addition, the protein molecules can partially participate in the hydration of magnesium cement and improve the later strength.

[0013] Preferably, the stabilizer is silicone resin polyether. The addition of the stabilizer can reduce the gas-liquid interfacial tension and enhance the elasticity of the foam film. Silicone resin forms a dense molecular film to resist external disturbances and improve the stability of the foam.

[0014] In a second aspect, the present invention provides a method for preparing the above-mentioned high-strength thermal insulation aerogel magnesia cement tile, comprising the following steps: (1) Mixing magnesium chloride with water and stirring using a blender to form brine; (2) adding magnesium oxide to the brine prepared in step (1) and stirring to prepare a mixture; (3) Use a foaming machine to mix the foaming agent, stabilizer and air for foaming, and control the pore size of the foam to be 100-200 μm; (4) adding the foam prepared in step (3) to the mixture prepared in step (2), and then adding the silica aerogel; (5) Finally, short glass fibers are added to prepare a slurry, which is poured into a mold for molding, and then cured to obtain a finished product.

[0015] Preferably, in step (1), when magnesium chloride is mixed with water, water is added to the magnesium chloride in small amounts and multiple times, and the brine Baume degree of the prepared brine is 23-28°Bé, and the stirrer speed is controlled at 300-500 rpm; Preferably, in step (2), when magnesium oxide is added to the brine, it is added in small amounts and multiple times to avoid agglomeration and uneven dispersion, and the stirrer speed is controlled at 300-700 rpm.

[0016] Preferably, in step (3), the stirring speed of the foaming machine is 900-1500 rpm. By reasonably controlling the amount of foaming agent and the speed of the foaming machine, a foam with a pore size of 100-200 μm is stably generated. If the foam pore size is too small, it will hinder the thermal insulation and thus affect the thermal insulation performance, while if the foam size is too large, it will affect the strength of the product. If the amount of foaming agent is too large, it is easy to cause the foam pore size to decrease, and even cause the bubbles to merge (coalesce) or break, resulting in uneven pore size or the appearance of large pores; if the amount of foaming agent is insufficient, it will result in a small number of bubble nuclei, a large space for bubble growth, and the formation of larger pore foam. If the stirring speed is too high, the high shear force makes the foaming agent or gas dispersed more finely in the matrix, the bubble nuclei are smaller and more evenly distributed, and tend to generate foam with smaller pore size. In addition, too high a speed may introduce too much mechanical energy, resulting in bubble breakage or structural instability; if the speed is too low, it is easy to cause uneven dispersion, with fewer and sparsely distributed bubble nuclei, and easily form large and uneven pores, or even a honeycomb structure.

[0017] Preferably, in step (4), the silica aerogel is added in small amounts and multiple times, and the stirrer speed is increased to 900-1000 rpm after the silica aerogel is added. The silica aerogel is also added in small amounts and multiple times during the process, because the density of aerogel particles is much lower than that of the sample in the system. Adding too much at one time can easily lead to uneven dispersion, agglomeration of aerogel particles, and severe heat leakage. In addition, the agglomerated aerogel particles affect the mechanical properties of the product and can easily cause cracking and other problems.

[0018] Preferably, in step (5), after the prepared slurry is poured into the mold, the bubbles therein are removed by slight vibration, and the mold is left to stand for 24 hours in an environment with a temperature of 20-35°C and a humidity of 60-70% to achieve the initial formation of the product.

[0019] Preferably, in step (5), the curing is continued at a temperature of 20-35℃, and the spraying treatment is carried out every day to keep the humidity at 70%-90% for 1-3 days, and then the natural curing is carried out at room temperature and in a ventilated condition for 6-8 days to obtain the final product. If the humidity is too low during the curing, the water evaporates quickly, the unhydrated cement particles stop reacting, and the strength is reduced, the surface is powdered, and shrinkage cracking occurs; if the humidity is too high, water may be precipitated, forming a weak layer, thereby reducing the strength of the product, and also delaying the setting time of the cement, affecting the production progress.

[0020] In a third aspect, the application provides the use of the high-strength heat-insulating aerogel magnesite cement tile prepared by the above preparation method in pipeline heat preservation.

[0021] The application has the following beneficial effects: 1. The high-strength heat-insulating aerogel magnesite cement tile prepared by the application has a thermal conductivity of ≤0.040 W / (m·K) and a compressive strength of ≥1 MPa, which greatly reduces the thermal conductivity of the product under the premise of ensuring sufficient mechanical properties, integrates the heat insulation and support functions of the pipeline, solves the problem of serious heat leakage in the pipe support part, and greatly improves the overall energy-saving efficiency of the pipeline.

[0022] 2. The application controls and optimizes the density, particle size, and hydrophobicity of the silica aerogel particles, improves the proportion of the aerogel particles in the composite system under the premise of ensuring uniform dispersion of the aerogel particles, and provides a basis for reducing the thermal conductivity of the aerogel magnesite cement tile.

[0023] 3. The application utilizes the structural characteristics of the combination of foaming foam and aerogel particles, utilizes the synergistic effect between the multiple pores, further improves the heat insulation performance and mechanical properties of the composite material, accurately controls the pore size of the foam and the size of the silica aerogel particles, makes the aerogel particles fully fill in the foam channels, and the coating of the foam can stabilize the aerogel particles to a certain extent, and the silica aerogel particles also support the foam to a certain extent, so that the design and construction of the multiple pore structure can improve the mechanical properties of the material. Reasonably distributing the aerogel particles in the foaming foam can significantly improve the heat insulation performance of the composite material. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The physical object diagram prepared by Example 1 of the application is shown in the figure; DETAILED DESCRIPTION

[0025] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0026] As introduced in the background technology section, although there are now products composited with aerogel and magnesia cement, the thermal conductivity is still above 0.05 W / (m·K). The reduction in thermal conductivity will cause a significant drop in mechanical properties, making it impossible to achieve the integration of efficient thermal insulation performance and excellent mechanical properties, and unable to play a supporting role for pipelines.

[0027] The high-strength thermal insulation aerogel magnesia cement tile prepared by the present invention has a thermal conductivity of ≤0.040 W / (m·K) and a compressive strength of ≥1 MPa. While ensuring sufficient mechanical properties, the thermal conductivity is greatly reduced.

[0028] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the technical solution of the present application will be described in detail below with reference to specific embodiments.

[0029] The test materials used in the examples of the present invention are all conventional test materials in the art and can be purchased through commercial channels. Example 1

[0030] A high-strength thermal insulation aerogel magnesia cement tile is composed of the following raw materials, calculated by weight: 100 parts of magnesium oxide, 55 parts of magnesium chloride, 40 parts of water, 30 parts of silicon oxide aerogel, 3 parts of short glass fibers, 1 part of foaming agent, and 0.6 part of stabilizer.

[0031] The active content of magnesium oxide is greater than 85%, and the density of silicon oxide aerogel is 110-180 Kg / m 3 The particle size of silica aerogel particles is 80-100 μm, and the contact angle of silica aerogel is 100-140°.

[0032] The length of the glass short fiber is 0.3-1 mm. The glass short fiber can be TS-UF300 produced by Taishan Glass Fiber Co., Ltd. or NF-UM200 produced by Nanjing Glass Fiber Research and Design Institute Co., Ltd.

[0033] The foaming agent is animal protein foaming agent, and the stabilizer is silicone resin polyether.

[0034] The preparation method comprises the following steps: (1) Mixing magnesium chloride with water to dissolve the magnesium chloride in the water, adding water in small amounts and multiple times, and stirring with a cement mixer. The prepared brine has a Baume degree of 23-28°Bé, and the speed of the cement mixer is controlled at 300-500 rpm; (2) Add magnesium oxide to the brine prepared in step (1) and stir. Add magnesium oxide in small amounts and multiple times to avoid agglomeration and uneven dispersion. Use a cement mixer to stir at a speed of 300-700 rpm. (3) Using a foaming machine, the foaming agent and stabilizer are mixed with air for foaming. The stirring speed of the foaming machine is 900 rpm-1500 rpm to generate stable foam. The pore size of the foam is controlled at 100-200 μm. (4) adding the foam prepared in step (3) to the mixture prepared in step (2), and then adding the silica aerogel in small amounts and multiple times. After adding the silica aerogel, the speed of the cement mixer is increased to 900-1000 rpm; (5) Finally, short glass fibers are added to prepare a slurry, which is poured into a mold and slightly shaken to remove bubbles. The slurry is left standing for 24 hours at a temperature of 20-35°C and a humidity of 60-70% to achieve preliminary shaping of the sample. The sample is then cured at 20-35°C and sprayed daily to ensure a humidity of 70%-90% for 1-3 days. The sample is then cured naturally at room temperature with ventilation for 6-8 days to obtain the final sample. Example 2

[0035] A high-strength thermal insulation aerogel magnesia cement tile is composed of the following raw materials, calculated by weight: 100 parts of magnesium oxide, 55 parts of magnesium chloride, 50 parts of water, 25 parts of silicon oxide aerogel, 2 parts of short glass fibers, 2 parts of foaming agent, and 0.5 parts of stabilizer.

[0036] The preparation method is the same as that in Example 1. Example 3

[0037] A high-strength thermal insulation aerogel magnesia cement tile is composed of the following raw materials, calculated by weight: 110 parts of magnesium oxide, 60 parts of magnesium chloride, 35 parts of water, 35 parts of silicon oxide aerogel, 5 parts of short glass fibers, 1 part of foaming agent, and 0.2 part of stabilizer.

[0038] The preparation method is the same as that in Example 1. Example 4

[0039] A high-strength thermal insulation aerogel magnesia cement tile is composed of the following raw materials, calculated by weight: 100 parts of magnesium oxide, 50 parts of magnesium chloride, 55 parts of water, 30 parts of silicon oxide aerogel, 1 part of short glass fiber, 0.5 part of foaming agent, and 0.8 part of stabilizer.

[0040] The preparation method is the same as that in Example 1. Example 5

[0041] A high-strength thermal insulation aerogel magnesia cement tile is composed of the following raw materials, calculated by weight: 105 parts of magnesium oxide, 55 parts of magnesium chloride, 50 parts of water, 35 parts of silicon oxide aerogel, 5 parts of short glass fibers, 1 part of foaming agent, and 0.6 part of stabilizer.

[0042] The preparation method is the same as that in Example 1.

[0043] The raw material components of each embodiment are shown in Table 1 below: Table 1 Raw material name Example 1 Example 2 Example 3 Example 4 Example 5 magnesium oxide 100 100 110 100 105 magnesium chloride 55 55 60 50 55 water 40 50 35 55 50 Silica aerogel 30 25 35 30 35 Short glass fiber 3 2 5 1 5 foaming agent 1 2 1 0.5 1 stabilizer 0.6 0.5 0.2 0.8 0.6 Comparative Example 1

[0044] Compared with Example 1, the difference is that the amount of silicon oxide aerogel added is 20 parts, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 2

[0045] Compared with Example 1, the difference is that the amount of silicon oxide aerogel added is 40 parts, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 3

[0046] Compared with Example 1, the difference is that: the component of added glass short fiber is 0 parts, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 4

[0047] Compared with Example 1, the difference is that the amount of glass short fiber added is 10 parts, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 5

[0048] Compared with Example 1, the difference is that the density of the added silica aerogel is 90 Kg / m 3 , the amounts of other raw materials and preparation methods remain unchanged. Comparative Example 6

[0049] Compared with Example 1, the difference is that the density of the added silica aerogel is 200Kg / m 3 , the amounts of other raw materials and preparation methods remain unchanged. Comparative Example 7

[0050] Compared with Example 1, the difference is that the contact angle of the added silica aerogel is 80°, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 8

[0051] Compared with Example 1, the difference is that the contact angle of the added silica aerogel is 160°, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 9

[0052] Compared with Example 1, the difference is that the particle size of the added silica aerogel particles is 60 μm, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 10

[0053] Compared with Example 1, the difference is that the particle size of the added silica aerogel is 120 μm, and the amounts of other raw materials and the preparation method remain unchanged.

[0054] The raw material compositions of Example 1 and Comparative Examples 1-10 are shown in Table 2 below: Table 2 Raw material name Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 magnesium oxide 100 100 100 100 100 100 100 100 100 100 100 magnesium chloride 55 55 55 55 55 55 55 55 55 55 55 water 40 40 40 40 40 40 40 40 40 40 40 Silica aerogel 30 20 40 30 30 30 30 30 30 30 30 Short glass fiber 3 3 3 0 10 3 3 3 3 3 3 foaming agent 1 1 1 1 1 1 1 1 1 1 1 stabilizer 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 <![CDATA[气凝胶密度;KG / m 3 ]]> 140 140 140 140 140 90 200 140 140 140 140 Aerogel hydrophobicity;° 120 120 120 120 120 120 120 80 160 120 120 Aerogel size; μm 100 100 100 100 100 100 100 100 100 60 120 Comparative Example 11

[0055] Compared with Example 1, the difference is that the amount of foaming agent added is 0.2 parts, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 12

[0056] Compared with Example 1, the difference is that the amount of foaming agent added is 4 parts, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 13

[0057] Compared with Example 1, the difference is that in step (3), the stirring speed of the foaming machine is 700 rpm, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 14

[0058] Compared with Example 1, the difference is that in step (3), the stirring speed of the foaming machine is 1700 rpm, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 15

[0059] Compared with Example 1, the difference is that in step (5), the humidity is maintained at 60% during the curing period, and the amounts of other raw materials and the preparation method remain unchanged. Comparative Example 16

[0060] Compared with Example 1, the difference is that in step (5), the humidity is maintained at 95% during the curing period, and the amounts of other raw materials and the preparation method remain unchanged.

[0061] The products prepared in Examples 1-5 and Comparative Examples 1-16 were subjected to performance tests. The thermal conductivity was tested using a thermal conductivity tester according to the reference standard GB / T 10294-2008. The compressive strength was tested using a universal testing machine. The density was calculated by measuring the volume and weight of the sample, and the surface was visually inspected for cracks.

[0062] The performance test results are shown in Table 3 below: Table 3 Serial number Thermal conductivity W / (m·K) Compressive strength (MPa) <![CDATA[密度(Kg / m 3 )]]> Cracking Example 1 0.037 1.5 380 No cracking Example 2 0.039 1.6 400 No cracking Example 3 0.035 1.3 370 No cracking Example 4 0.038 1.4 390 No cracking Example 5 0.036 1.7 380 No cracking Comparative Example 1 0.042 1.8 420 No cracking Comparative Example 2 0.036 1.2 360 Surface cracking Comparative Example 3 0.036 0.8 370 Surface cracking Comparative Example 4 0.044 2.0 390 No cracking Comparative Example 5 0.039 0.7 360 Surface cracking Comparative Example 6 0.042 1.7 390 No cracking Comparative Example 7 0.062 3.8 690 No cracking Comparative Example 8 0.051 0.8 370 Surface cracking Comparative Example 9 0.042 1.2 380 No cracking Comparative Example 10 0.049 1.5 380 Surface cracking Comparative Example 11 0.042 1.6 410 No cracking Comparative Example 12 0.043 1.3 370 No cracking Comparative Example 13 0.041 1.4 380 No cracking Comparative Example 14 0.044 1.8 380 No cracking Comparative Example 15 0.037 0.6 390 Surface cracking Comparative Example 16 0.039 0.9 380 No cracking The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A high-strength thermal insulation aerogel magnesia cement tile, characterized in that: The invention comprises the following raw materials in parts by weight: 100-110 parts of magnesium oxide, 50-60 parts of magnesium chloride, 35-55 parts of water, 25-35 parts of silicon oxide aerogel, 1-5 parts of short glass fibers, 0.5-2 parts of foaming agent and 0.2-0.8 parts of stabilizer.

2. The high-strength thermal insulation aerogel magnesia cement tile according to claim 1, characterized in that: The density of silica aerogel is 110-180 Kg / m 3 , the particle size of silica aerogel is 80-100 μm.

3. The high-strength thermal insulation aerogel magnesia cement tile according to claim 1, characterized in that: The contact angle of silica aerogel is 100-140°.

4. The method for preparing the high-strength thermal insulation aerogel magnesia cement tile according to any one of claims 1 to 3, characterized in that: The steps include: (1) Mixing magnesium chloride with water and stirring using a blender to form brine; (2) adding magnesium oxide to the brine prepared in step (1) and stirring to prepare a mixture; (3) Use a foaming machine to mix the foaming agent, stabilizer and air for foaming, and control the pore size of the foam to be 100-200 μm; (4) adding the foam prepared in step (3) to the mixture prepared in step (2), and then adding the silica aerogel; (5) Finally, short glass fibers are added to prepare a slurry, which is poured into a mold for molding, and then cured to obtain a finished product.

5. The preparation method according to claim 4, characterized in that In step (1), when magnesium chloride is mixed with water, water is added to the magnesium chloride, and the brine prepared has a Baume degree of 23-28°Bé, and the stirrer speed is controlled at 300-500 rpm.

6. The preparation method according to claim 4, characterized in that In step (3), the stirring speed of the foaming machine is 900-1500 rpm.

7. The preparation method according to claim 4, characterized in that In step (4), after adding the silica aerogel, the stirrer speed is increased to 900-1000 rpm.

8. The preparation method according to claim 4, characterized in that In step (5), the prepared slurry is poured into the mold and then allowed to stand for 24 hours in an environment with a temperature of 20-35°C and a humidity of 60-70% to achieve the initial formation of the product.

9. The preparation method according to claim 4, characterized in that In step (5), curing is continued at a temperature of 20-35°C, and spraying is performed every day to maintain the humidity at 70%-90% for 1-3 days, and then natural curing is carried out at room temperature under ventilation conditions for 6-8 days to obtain the final product.

10. Use of the high-strength thermal insulation aerogel magnesia cement tile prepared by the preparation method according to any one of claims 4 to 9 in pipeline insulation.

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