Preparation method of aerogel powder doped Portland cement-based insulating brick and product of aerogel powder doped Portland cement-based insulating brick

Abstract

The invention discloses a preparation method of an aerogel powder doped Portland cement-based insulating brick and a product thereof, the insulating brick comprises the following components in percentage by weight: 3-10% of aerogel powder, 30-60% of Portland cement, 45-60% of aggregate, 3-6% of additive and water, and the addition amount of the water is controlled to be 0.3-0.5 according to the water-cement ratio; the preparation method of the insulating brick comprises the steps of raw material preparation, mixing and stirring, compression molding and maintenance molding, so as to obtain the insulating brick finished product. According to the product prepared by the method disclosed by the invention, the aerogel powder and the Portland cement base are combined, the advantages of the two materials are exerted to realize performance unification, diversified product specifications can be produced to meet different requirements, and the product has good adaptability; the invention not only can provide a novel high-performance thermal insulation material for the industry to promote technical progress and innovation and has important practical significance, but also can bring remarkable social benefits, realize the goal of sustainable development and improve the overall social benefits, and is beneficial to practical popularization and application.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a method for preparing thermal insulation bricks by doping aerogel powder with silicate cement and the product thereof. Background Art

[0002] With the continuous improvement of energy-saving requirements for buildings, higher requirements are also placed on the performance of insulation materials. Traditional insulation bricks have problems such as limited insulation performance and poor durability, so there are certain limitations. For example, in the use of raw materials, the combination of aerogel powder and silicate cement is not good, resulting in unstable performance of insulation bricks. In the mixing and stirring process, a simple stirring method is usually used, which makes it difficult to achieve sufficient and uniform mixing of materials, affecting the quality of insulation bricks. In terms of molding technology, traditional methods may not guarantee the density and strength of insulation bricks, thereby reducing insulation performance and durability. The curing process is also relatively extensive, and it is difficult to accurately control the curing conditions, resulting in uneven product quality.

[0003] After searching, there are many patent documents related to insulation bricks. For example, the patent document with application publication number CN108727036A discloses a high-efficiency energy-saving insulation brick and a preparation method thereof, and adopts a specific material combination to improve the performance of the insulation brick. From its disclosed content, it can be seen that the insulation effect can be achieved, but there are still deficiencies in the raw material pretreatment and mixing process; and the patent document with application publication number CN105888120A discloses a multifunctional composite thermal insulation brick and a production process thereof. From its disclosed content, it can be seen that it has some innovations in the molding process and can achieve the insulation effect, but in terms of improvements in the mixing and curing links, the performance of the insulation brick is improved to a certain extent, and its insulation effect can be enhanced, but in the specific production process, a thin metal layer is required to increase the production cost, and there are still some deficiencies.

[0004] Since traditional thermal insulation materials have many defects in practical applications, such as the poor fire resistance of polystyrene foam boards and the insufficient durability of rock wool, and although the mechanical properties and durability of silicate cement-based materials are good, their thermal insulation performance is poor. Aerogel, as a material with excellent thermal insulation performance, is doped into silicate cement to prepare thermal insulation bricks with excellent performance. Therefore, by utilizing the extremely low thermal conductivity of aerogel and doping it into silicate cement, the thermal insulation performance of thermal insulation bricks can be greatly improved, the energy loss of buildings can be reduced, energy consumption can be reduced, and the goal of energy-saving and environmentally friendly buildings can be achieved. Thus, a method for preparing thermal insulation bricks by doping aerogel powder with silicate cement is provided, so that aerogel powder doped with silicate cement-based thermal insulation bricks with excellent performance can be prepared, thereby meeting the needs of building energy conservation. Therefore, the development of a new type of thermal insulation brick with excellent performance is of great practical significance. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for preparing thermal insulation bricks by doping aerogel powder with silicate cement, making full use of the mature cement technology and the wide source of raw materials, and combining silicate cement with aerogel powder. In this way, the high performance advantage of aerogel can be brought into play, thereby reducing energy consumption and waste emissions. It can not only promote the green transformation of the construction industry, but also prepare aerogel powder doped silicate cement-based thermal insulation bricks with excellent performance, thereby meeting the needs of building energy conservation. Specifically, it is a method for preparing thermal insulation bricks by doping aerogel powder with silicate cement and its products.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for preparing thermal insulation bricks by doping aerogel powder with silicate cement, wherein the components and weight percentages of the thermal insulation bricks are: 3-10% aerogel powder, 30-60% silicate cement, 45-60% aggregate, 3-6% admixture and water, wherein the amount of water added is controlled between 0.3-0.5 according to the water-cement ratio; the preparation method of the thermal insulation bricks includes raw material preparation, mixing and stirring, molding and curing molding, so as to obtain the finished thermal insulation bricks.

[0007] Furthermore, a method for preparing thermal insulation bricks by doping aerogel powder with silicate cement according to the present invention is used, and the method for preparing thermal insulation bricks specifically comprises the following steps: S1. Raw material preparation: Silica aerogel powder with a particle size of 10-50 nanometers is selected as the raw material, and then the selected aerogel powder is subjected to surface modification treatment to improve its compatibility in the silicate cement base; at the same time, silicate cement with a particle size of 20-100 microns is selected as the raw material, and then the selected silicate cement is selected and activated to remove impurities and control its fineness to enhance its activity; in addition, aggregate is selected, and aggregate with a particle size of 0.1-10 mm is selected as the raw material; S2. Mixing and stirring: The raw materials of step S1 are first added into a mixer according to the raw material ratio, and the aerogel powder and silicate cement are fully mixed to make the aerogel powder preliminarily dispersed in the cement base; then the aggregate is added and the stirring is continued to make the mixture more uniform, and finally the admixture and water are added to control the water-cement ratio between 0.3-0.5, and the stirring is continued for 15-30 minutes to obtain a mixture; S3. Compression molding: The mixture obtained in step S2 is put into a molding mold, the compression molding parameters are controlled, a pressure of 10-20MPa is applied, and the pressure is maintained for 20-60 minutes to ensure that the brick body is tightly formed, and the mold is demolded after the pressure is maintained to obtain a molded block; S4. Curing and molding: The molded block obtained in step S3 is directly transported to a curing site for curing, and the finished insulation brick is obtained after curing.

[0008] Furthermore, in the preparation method of thermal insulation bricks made by doping aerogel powder with silicate cement as described in the present invention, the specific method of surface modification of the aerogel powder in step S1 is to use a surfactant for treatment, wherein the surfactant includes a composition of one or more of sodium dodecylbenzene sulfonate, hexadecyltrimethylammonium bromide or polyethylene glycol, the modification treatment time is 1-2 hours, the treatment temperature is 35-40°C, and the surface of the aerogel powder after surface modification has active groups, thereby enhancing the bonding force with silicate cement.

[0009] Furthermore, in the preparation method of thermal insulation bricks made of aerogel powder-doped silicate cement-based materials according to the present invention, the specific method of selecting and activating the silicate cement in step S1 is to select cement with a particle size of 20-80 microns and treat it with a chemical activator, wherein the chemical activator includes one or a combination of triethanolamine and diethanol monoisopropanolamine.

[0010] Furthermore, in the method for preparing thermal insulation bricks by doping aerogel powder with silicate cement as described in the present invention, the aggregate in step S1 includes one or a combination of two of fine sand, crushed stone and ceramsite.

[0011] Furthermore, in the preparation method of thermal insulation bricks made by doping aerogel powder with silicate cement as described in the present invention, the admixture in step S2 includes one or both of a dispersant and a reinforcing agent, wherein the dispersant is any one of polycarboxylates or naphthalenesulfonate formaldehyde condensates, and the reinforcing agent is nano calcium carbonate or glass fiber.

[0012] Furthermore, in the preparation method of thermal insulation bricks made of aerogel powder-doped silicate cement-based materials described in the present invention, the forming mold in step S3 is a steel mold or a plastic mold, and an automated hydraulic forming equipment matching the forming mold is configured, and the molding parameters are controlled by the automated hydraulic forming equipment, a pressure of 10-15MPa is applied, and the pressure is maintained for 30-40 minutes.

[0013] Furthermore, in the method for preparing thermal insulation bricks by doping aerogel powder with silicate cement as described in the present invention, the curing and molding in step S4 includes one or more of steam curing, solar curing or natural curing.

[0014] Furthermore, in the preparation method of thermal insulation bricks made of aerogel powder doped with silicate cement described in the present invention, the curing and molding temperature is controlled between 10-30°C, the humidity is controlled between 50-80%, and the curing time is 30-60 hours. Through curing and molding, the strength of the molded block is gradually improved to meet the national standard.

[0015] The present invention also provides a thermal insulation brick, which is prepared by the above preparation method.

[0016] The preparation method and product of thermal insulation bricks made of aerogel powder doped with silicate cement described in the present invention have the following beneficial effects compared with the prior art: silicate cement is doped in aerogel powder. First, the aerogel powder is surface activated to increase its compatibility and bonding force with silicate cement, laying the foundation for the production of high-quality thermal insulation bricks from the raw material pretreatment stage. In the mixing and stirring process, a multi-stage stirring system is introduced to ensure that the aerogel powder and silicate cement can be fully and evenly mixed. At the same time, the intelligent stirring control can automatically adjust the stirring parameters according to different situations, greatly improving the mixing effect. Secondly, the molding process adopts high-pressure molding technology, which can improve the density and strength of the thermal insulation bricks. The specially designed mold can also increase the surface area of ​​the thermal insulation bricks and improve the thermal insulation effect. Finally, in the maintenance stage, the maintenance process innovatively adopts an intelligent maintenance system to monitor the maintenance environment parameters in real time and automatically adjust them to ensure the best maintenance conditions. The accelerated maintenance technology shortens the maintenance time and improves production efficiency. In terms of quality inspection, online quality inspection equipment and big data quality analysis technology ensure the stability and reliability of product quality.

[0017] It can be seen that the product prepared by the method described in the present invention not only has excellent thermal insulation performance, but also the incorporation of aerogel powder makes the thermal conductivity of the insulation brick extremely low, effectively reducing energy consumption and contributing to energy conservation and emission reduction; at the same time, it also has high strength and durability. After combining with silicate cement base, it gives high strength and excellent durability while ensuring thermal insulation performance, thereby extending the service life; in addition, the preparation method is environmentally friendly and pollution-free, and the construction is convenient and fast. By combining aerogel powder with silicate cement base, the advantages of the two materials are brought into play to achieve unified performance; using precise preparation technology, the amount of aerogel powder added and the uniformity of distribution are controlled to ensure stable performance, and diversified product specifications can be produced to meet different needs, with good adaptability. In terms of positive utility, it can achieve energy conservation and emission reduction, reduce the energy demand of buildings, alleviate energy tension and protect the environment; it can not only improve living comfort, but also keep the indoor temperature stable; at the same time, in terms of positive utility, it can also promote the development of the construction industry, provide the industry with new high-performance insulation materials, promote technological progress and innovation, which has important practical significance, and can also bring significant social benefits, achieve sustainable development goals, improve the overall social benefits, and be conducive to actual promotion and application. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0019] This embodiment provides a method for preparing thermal insulation bricks by doping aerogel powder with silicate cement. The method for preparing the thermal insulation bricks specifically comprises the following steps: S1. Raw material preparation S11. Select silica aerogel powder with a particle size of 10-50 nanometers, and use a surfactant, sodium dodecylbenzene sulfonate, for surface treatment for 2 hours at a temperature of 40°C.

[0020] S12. Select silicate cement with a particle size of 30-80 microns, and use chemical activator triethanolamine to activate the silicate cement. The amount of activator is 1% of the cement mass, the treatment time is 1 hour, and the treatment temperature is 50°C S13. Select fine sand with a particle size of 1-3 mm as aggregate; S2. Mixing and stirring: The treated aerogel powder and silicate cement base were added to a high-powered mixer with automatic speed regulation function in a mass ratio of 1:10. The mixture was first stirred at 500 rpm for 10 minutes to disperse the aerogel powder in the cement base. Aggregates (accounting for 48% of the total mass) were then added in sequence. The speed was adjusted to 800 rpm and stirred for 15 minutes to make the mixture more uniform. Finally, an appropriate amount of dispersant polycarboxylate (accounting for 0.5% of the total mass) and reinforcing agent nano calcium carbonate (accounting for 2% of the total mass) were added, as well as water, with a water-cement ratio of 0.35, and stirring was continued for 20 minutes.

[0021] S3. Compression molding Using high-precision steel molds and automated hydraulic forming equipment, the mixed materials are slowly injected into the mold, a pressure of 12MPa is applied, and the pressure is maintained for 35 minutes to ensure that the bricks are tightly formed.

[0022] S4. Curing and forming: A curing system is formulated, and the formed insulation bricks are placed in a curing room with a temperature of 28°C and a humidity of 55% for 36 hours. Then steam curing is used and cured for 10 hours at a pressure of 0.6MPa to quickly harden the insulation bricks and stabilize their properties. The strength of the molded blocks is gradually improved to meet national standards, and the finished insulation bricks are obtained after curing.

[0023] According to tests, the thermal conductivity of the thermal insulation brick prepared by this embodiment is 0.07 W / (m·K) at room temperature, and the compressive strength is 22 MPa. Example 2

[0024] A method for preparing thermal insulation bricks by doping aerogel powder with silicate cement, the method for preparing the thermal insulation bricks specifically comprising the following steps: S1. Raw material preparation S11. Alumina aerogel powder with an average particle size of 30-50 nanometers is selected and surface treated with surfactant hexadecyltrimethylammonium bromide for 1.5 hours at a temperature of 35°C.

[0025] S12. Select high sulfate-resistant silicate cement with a particle size in the range of 20-70 microns, and use a chemical activator diethanol monoisopropanolamine to activate the silicate cement. The amount of activator is 1.5% of the cement mass, the treatment time is 1.2 hours, and the treatment temperature is 45°C.

[0026] S13. Use crushed stone with a particle size of 8-10 mm as aggregate; S2. Mixing and stirring The treated aerogel powder and silicate cement base were added into a high-efficiency stirring kettle in a ratio of 1:8, and different stirring procedures were adopted. First, they were stirred at 400 rpm for 12 minutes, and then aggregate (accounting for 42% of the total mass) was added. The speed was adjusted to 700 rpm and stirred for 18 minutes. Then, dispersant naphthalenesulfonate formaldehyde condensate (accounting for 0.6% of the total mass) and reinforcing agent glass fiber chopped strands (accounting for 1.5% of the total mass) were added, and water was added. The water-cement ratio was 0.4, and stirring was continued at 450 rpm for 30 minutes.

[0027] S3. Compression molding Using new plastic molds and automated air pressure molding equipment, the mixed materials are injected into the mold, a pressure of 10MPa is applied, and the pressure is maintained for 40 minutes to ensure a smooth surface of the brick.

[0028] S4. Curing and forming First, the formed insulation bricks are placed in an environment with a temperature of 26°C and a humidity of 60% for 48 hours. After that, a combination of solar energy curing and natural curing is used, curing in the sun for 8 hours and then in the natural environment for 16 hours to reduce energy consumption and ensure the performance of the insulation bricks, so that the molded blocks gradually increase their strength to meet national standards. After curing, the finished insulation bricks are obtained.

[0029] According to tests, the thermal conductivity of the thermal insulation brick prepared by this embodiment is 0.065 W / (m·K) at room temperature, and the compressive strength is 21 MPa.

[0030] Through the above embodiments, it can be seen that the thermal insulation bricks prepared by the method of the present invention can stably produce thermal insulation bricks with excellent performance, and the process parameters can be adjusted according to different needs, and the thermal insulation bricks have wide applicability.

[0031] Comparative Example 1 Except that no aerogel powder is added, the other raw materials and preparation method are the same as those in Example 1.

[0032] According to the test, the thermal conductivity of the insulation brick prepared by this comparative example is 0.117 W / (m·K) at room temperature, and the compressive strength is 18 MPa.

[0033] Comparative Example 2 Untreated silica aerogel powder and silicate cement base were added into a stirring tank at a ratio of 1:8 and stirred. The remaining raw materials and preparation method were the same as those in Example 2.

[0034] After testing, the thermal insulation bricks prepared in this comparative example agglomerated during the mixing process, were difficult to shape, and had a compressive strength of only 15 MPa.

[0035] It can be seen from the above examples and comparative examples that the preparation method of the present invention can significantly improve the thermal insulation performance and mechanical properties of thermal insulation bricks by optimizing the doping amount of aerogel powder and the preparation process parameters. When no aerogel powder is added, the thermal insulation performance of the thermal insulation brick is significantly reduced; and when the aerogel powder is not treated, agglomeration occurs, affecting the forming and mechanical properties of the thermal insulation brick.

[0036] In addition, in order to fully verify the innovation and advantages of the preparation method of the present invention, the thermal insulation bricks prepared by the method described in Example 2 were subjected to a series of rigorous experiments under different experimental conditions. The following are the specific experimental data: (1) Thermal insulation performance test under different temperature conditions

[0037] (2) Strength test under different pressure conditions

[0038] (3) Durability test under different freeze-thaw cycles

[0039] It can be seen that the preparation method of thermal insulation bricks made by using aerogel powder doped with silicate cement described in the present invention has made innovative improvements in the process flow. First, the aerogel powder is surface activated to increase its compatibility and bonding with silicate cement, laying the foundation for the production of high-quality thermal insulation bricks from the raw material pretreatment stage. In the mixing and stirring process, a multi-stage stirring system is introduced to ensure that the aerogel powder and silicate cement can be fully and evenly mixed. At the same time, the intelligent stirring control can automatically adjust the stirring parameters according to different situations, greatly improving the mixing effect. The molding process adopts high-pressure molding technology to improve the density and strength of the thermal insulation bricks. The specially designed mold can also increase the surface area of ​​the thermal insulation bricks and improve the thermal insulation effect. The maintenance process innovatively adopts an intelligent maintenance system to monitor the maintenance environment parameters in real time and automatically adjust them to ensure the best maintenance conditions. The accelerated maintenance technology shortens the maintenance time and improves production efficiency. In terms of quality inspection, online quality inspection equipment and big data quality analysis technology ensure the stability and reliability of product quality.

[0040] These innovative improvements in the process flow have effectively solved many problems in the traditional preparation methods of insulation bricks, improved the performance of insulation bricks, reduced production costs, and enhanced production efficiency. At the same time, it also improved the sustainability of the products and opened up new avenues for the production of insulation bricks.

[0041] Through the above innovative process flow, aerogel powder-doped silicate cement-based insulation bricks with excellent performance can be prepared to meet the needs of building energy conservation.

[0042] Therefore, the method for preparing thermal insulation bricks by doping aerogel powder with silicate cement base described in the present invention can, firstly, utilize the extremely low thermal conductivity of aerogel and dope it into silicate cement base, which can greatly improve the thermal insulation performance of thermal insulation bricks, reduce the energy loss of buildings, reduce energy consumption, and help achieve the goal of energy-saving and environmentally friendly buildings. Secondly, while improving the thermal insulation performance, the mechanical properties of thermal insulation bricks such as compression and flexural strength are enhanced to ensure that they can withstand loads and external forces, and improve service life and safety. Third, with its excellent performance, it can be widely used in various types of buildings and special environments to expand the application field. Fourth, by combining silicate cement base with aerogel powder, the mature cement process and a wide range of raw material sources are fully utilized, the high performance advantages of aerogel are brought into play, energy consumption and waste emissions are reduced, and the green transformation of the construction industry is promoted.

[0043] In summary, the preparation method of thermal insulation bricks made of aerogel powder doped with silicate cement provided by the present invention has many advantages, characteristics and positive effects. Its advantage is that it has excellent thermal insulation performance. The addition of aerogel powder makes the thermal conductivity of thermal insulation bricks extremely low, effectively reducing energy consumption and contributing to energy conservation and emission reduction; it also has high strength and durability. After combining with silicate cement, it gives higher strength and excellent durability while ensuring thermal insulation performance, extending the service life; in addition, this method is environmentally friendly and pollution-free, and the construction is convenient and fast. Its characteristics are that aerogel powder and silicate cement are innovatively combined to give full play to the advantages of the two materials to achieve unified performance. It adopts precise preparation technology to control the amount of aerogel powder added and the uniformity of distribution to ensure stable performance, and it can produce diversified product specifications to meet different needs, with good adaptability. In terms of positive effects, it can achieve energy conservation and emission reduction, reduce the energy demand of buildings, ease energy tension and protect the environment; it can not only improve living comfort, but also maintain stable indoor temperature; at the same time, in terms of positive effects, it can also promote the development of the construction industry, provide the industry with new high-performance insulation materials, promote technological progress and innovation, which has important practical significance, and can also bring significant social benefits, achieve sustainable development goals, improve the overall social benefits, and is conducive to practical promotion and application.

[0044] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing thermal insulation bricks by doping aerogel powder with silicate cement, characterized in that: The components and weight percentages of the thermal insulation brick are: 3-10% aerogel powder, 30-60% silicate cement, 45-60% aggregate, 3-6% admixture and water, wherein the amount of water added is controlled between 0.3 and 0.5 according to the water-cement ratio; the preparation method of the thermal insulation brick includes raw material preparation, mixing and stirring, molding and curing to obtain the finished thermal insulation brick.

2. The method for preparing thermal insulation bricks by mixing aerogel powder with silicate cement according to claim 1, characterized in that: The preparation method of the thermal insulation brick specifically comprises the following steps: S1. Raw material preparation: Select silica aerogel powder with a particle size of 10-50 nanometers as raw material, and then perform surface modification on the selected aerogel powder; at the same time, select silicate cement with a particle size of 20-100 microns as raw material, and then select and activate the selected silicate cement; in addition, select aggregate, and select aggregate with a particle size of 0.1-10mm as raw material; S2. Mixing and stirring: The raw materials of step S1 are first added into a mixer according to the raw material ratio, and the aerogel powder and silicate cement are fully mixed to make the aerogel powder preliminarily dispersed in the cement base; then the aggregate is added and the stirring is continued to make the mixture more uniform, and finally the admixture and water are added to control the water-cement ratio between 0.3-0.5, and the stirring is continued for 15-30 minutes to obtain a mixture; S3. Compression molding: The mixture obtained in step S2 is put into a molding mold, the compression molding parameters are controlled, a pressure of 10-20MPa is applied, and the pressure is maintained for 20-60 minutes to ensure that the brick body is tightly formed, and the mold is demolded after the pressure is maintained to obtain a molded block; S4. Curing and molding: The molded block obtained in step S3 is directly transported to a curing site for curing, and the finished insulation brick is obtained after curing.

3. The method for preparing thermal insulation bricks by mixing aerogel powder with silicate cement according to claim 2, characterized in that: The specific method of the surface modification treatment of the aerogel powder in step S1 is to use a surfactant for treatment, wherein the surfactant includes a combination of one or more of sodium dodecylbenzene sulfonate, hexadecyltrimethylammonium bromide or polyethylene glycol, the modification treatment time is 1-2 hours, and the treatment temperature is 35-40°C.

4. The method for preparing thermal insulation bricks by mixing aerogel powder with silicate cement according to claim 2, characterized in that: The specific method for selecting and activating the silicate cement in step S1 is to select cement with a particle size of 20-80 microns and treat it with a chemical activator, wherein the chemical activator includes one or a combination of triethanolamine and diethanol monoisopropanolamine.

5. The method for preparing thermal insulation bricks by mixing aerogel powder with silicate cement according to claim 2, characterized in that: The aggregate in step S1 includes one or a combination of fine sand, crushed stone and ceramsite.

6. The method for preparing thermal insulation bricks by mixing aerogel powder with silicate cement according to claim 2, characterized in that: The additive in step S2 includes one or a combination of a dispersant or a reinforcing agent, wherein the dispersant is any one of polycarboxylate or naphthalenesulfonate formaldehyde condensate, and the reinforcing agent is nano calcium carbonate or glass fiber.

7. The method for preparing thermal insulation bricks by mixing aerogel powder with silicate cement according to claim 2, characterized in that: The molding mold in step S3 is a steel mold or a plastic mold, and is equipped with an automated hydraulic molding device that matches the molding mold. The molding parameters are controlled by the automated hydraulic molding device, a pressure of 10-15 MPa is applied, and the pressure is maintained for 30-40 minutes.

8. The method for preparing thermal insulation bricks by mixing aerogel powder with silicate cement according to claim 2, characterized in that: The curing and molding in step S4 may be performed by one or more of steam curing, solar curing or natural curing.

9. The method for preparing thermal insulation bricks by mixing aerogel powder with silicate cement according to claim 8, characterized in that: The temperature of the curing molding is controlled between 10-30° C., the humidity is controlled between 50-80%, and the curing time is 30-60 hours. Through the curing molding, the strength of the molded block is gradually improved to reach the national standard.

10. A thermal insulation brick, characterized in that: It is prepared by the preparation method described in any one of claims 1 to 9.

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