Preparation method and application of aerogel-loaded inorganic composite polyphenyl A-grade thermal insulation wave-absorbing plate

Abstract

The application belongs to the field of building thermal insulation wave-absorbing plate production method, and provides a preparation method and application of aerogel loaded inorganic composite polystyrene A-grade thermal insulation wave-absorbing plate. First, load aerogel in rigid porous framework material microbeads, silicon powder or zeolite powder. Then, encapsulate the porous aerogel composite material with paraffin oil, and then disperse it in polystyrene particle cement-based material containing adhesive film at a certain proportion, and press mold to obtain the aerogel loaded inorganic composite polystyrene A-grade thermal insulation wave-absorbing plate. It is found that the dry density reduction is more than 10%, the thermal conductivity reduction is more than 40%, the water absorption is less than 5%, the maximum tensile strength is 0.24 MPa, which meets 060 grade >= 0.12 MPa, the maximum compressive strength is 0.55 MPa, which meets 060 grade >= 0.2 MPa, and the maximum / minimum reflectivity in 2-18 GHz wave frequency is -43.2~ -17.6 dB.

Description

Technical Field

[0001] This invention belongs to the field of building insulation and wave-absorbing board production methods. Specifically, it relates to a method for preparing and applying an aerogel-loaded inorganic composite polystyrene Class A insulation and wave-absorbing board. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] In recent years, with the development of technology, external wall insulation materials have gradually come into view, demonstrating their importance as a focus of attention and a crucial component in the increasingly environmentally friendly and energy-saving trend. While common materials like polystyrene boards and extruded polystyrene boards offer good insulation, their poor fire resistance makes them prone to causing fires. Rock wool insulation boards, on the other hand, offer good fire resistance but lack sufficient insulation. Furthermore, these common insulation materials suffer from insufficient adhesion, leading to easy detachment with age and potential safety hazards in building construction. Meanwhile, high-end building insulation panels for locations near airports, docks, navigation markers, television stations, and receiving stations, or for research institutions, precision instrument factories, and national security units requiring electromagnetic interference protection and information leakage prevention, necessitate the development of energy-efficient, earthquake-resistant, and electromagnetic shielding and absorption properties. These panels, while maintaining basic physical and mechanical properties and thermal insulation, also possess excellent wave absorption capabilities, resulting in more cost-effective insulation boards with wider engineering applications.

[0004] Patent CN 114856010A discloses an inorganic / organic composite Class A insulation board, which is produced from a slurry made of polystyrene particles and a modifier. However, while ensuring its mechanical strength, the insulation performance of the aforementioned insulation board is still not good enough. Improvements are needed in the insulation performance of the insulation board, and its dry density and pore structure also need further improvement to effectively reduce its thermal conductivity while ensuring its basic mechanical properties. Furthermore, the wave absorption properties of the lightweight porous material have not been effectively utilized.

[0005] Currently, aerogel has become a widely accepted choice for thermal insulation materials. Most inorganic composite polystyrene insulation boards also incorporate aerogel to reduce their thermal conductivity. However, because polystyrene insulation boards require the addition of numerous inorganic materials as a supporting framework, this increases the density of the aerogel, reducing its performance. Under external forces, existing aerogels are prone to pore collapse and damage, have low heat resistance, and the porous materials produced by existing gel injection molding methods exhibit poor thermal insulation performance. Furthermore, Chinese invention patent application CN114736035A discloses a hollow glass microsphere-aerogel composite material and its preparation method, and patent application CN101525248B discloses a ceramic aerogel composite material and its preparation method. However, these aerogel-loaded microspheres and ceramic composite materials do not form a protective aerogel framework, nor do they address how to integrate them into cement-based insulation board systems to effectively improve their thermal insulation performance; simultaneously, they do not develop the good wave absorption properties of closed porous materials and polystyrene foam particles. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to prepare an aerogel-loaded inorganic composite polystyrene Class A thermal insulation and microwave absorbing board. This is achieved by first synthesizing and solidifying aerogel within the pores of natural porous framework materials such as microspheres, silica powder, and zeolite powder, then encapsulating it with a paraffin oil layer to create a porous aerogel composite material. This material is then incorporated into a cement-based modifier in a specific ratio, and finally mixed with polystyrene foam particles adhered to a cellulose ether adhesive film layer to produce the aerogel-loaded inorganic composite polystyrene Class A thermal insulation and microwave absorbing board. This effectively overcomes the problems of traditional methods where aerogel is directly added to insulation materials, resulting in easy collapse and damage of the aerogel pores under external force, low heat resistance, insufficient development of microwave absorption performance, and poor thermal insulation performance of porous materials produced by existing gel injection molding methods.

[0007] Compared with current inorganic composite polystyrene Class A thermal insulation and microwave absorbing panels, this invention firstly loads aerogel into the pores of skeleton materials such as microspheres and silica powder with rigid micro / nano-porous structures, effectively ensuring the integrity of the loaded aerogel pore structure under external forces; secondly, it encapsulates the corresponding porous aerogel composite material with a paraffin oil layer, effectively preventing aerogel escape and realizing the excellent thermal insulation performance of the thermal insulation and microwave absorbing panel with dispersed aerogel; thirdly, a cellulose ether adhesive film layer composed of cellulose and starch ether is adhered to the surface of polystyrene foam particles, which is stable over a wide shear rate range and has good shear resistance, ensuring that it will not break during stirring, effectively improving the interfacial bonding force between polystyrene foam particles and cement modifier slurry, ensuring the integrity of the thermal insulation and microwave absorbing panel material system, significantly improving the workability of polystyrene particle thermal insulation mortar, effectively preventing the problem of foam particle detachment, and at the same time possessing good electromagnetic wave absorption performance, resulting in a high overall cost-effectiveness.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a method for preparing an aerogel-supported inorganic composite polystyrene Class A thermal insulation and microwave absorbing plate, comprising:

[0010] By loading aerogels onto a rigid porous framework material, porous aerogel composite materials are obtained.

[0011] Paraffin oil is mixed with the porous aerogel composite material to obtain a porous aerogel composite material coated with a paraffin oil layer.

[0012] The porous aerogel composite material coated with the paraffin oil layer is dispersed in a cement-based modifier to obtain a modifier containing a porous aerogel composite material coated with a paraffin oil layer.

[0013] Cellulose and amylase are combined and water is added to prepare a cellulose ether solution. The cellulose ether solution is then sprayed onto the surface of polystyrene particles to obtain polystyrene foam particles with an adhesive cellulose ether film layer.

[0014] The modifier of HBSC and porous aerogel composite material containing paraffin oil layer is placed in a mixing tank and dry-mixed for 5-10 minutes. Then, water is added according to the ratio and the mixture is stirred in a mixing tank with a silicone sheet stirring paddle for 1-2 minutes to obtain a slurry of modifier of aerogel loaded porous composite material containing paraffin oil layer and cement.

[0015] The polystyrene foam particles with the cellulose ether adhesive film layer and the modifier of the aerogel-loaded porous composite material wrapped with the paraffin oil layer are mixed evenly with cement slurry, molded, initially cured, demolded, and then cured in the middle stage to obtain the final product.

[0016] The present invention adopts the following improvement idea:

[0017] 1) The introduction of porous aerogel composite materials solves the problem that the density of aerogel increases due to the skeleton support material, thereby reducing the performance of aerogel. It also solves the problems that existing aerogels are prone to pore collapse and damage under external force, have low heat resistance, and have poor thermal insulation performance of porous materials produced by existing gel injection molding methods. It effectively reduces the thermal conductivity of the inorganic composite polystyrene thermal insulation and microwave absorbing board, while this porous material also improves the microwave absorption performance of the insulation board.

[0018] 2) Paraffin oil is used to seal the porous aerogel composite material to prevent the aerogel from flowing out after composite, which would lead to a decrease in performance;

[0019] 3) The introduction of cellulose and starch ethers, and the resulting cellulose ether solution improves the stability and cohesiveness of the adhesive polystyrene foam particle system.

[0020] In the second aspect of the present invention, there is provided an aerogel-loaded inorganic composite polystyrene thermal insulation and wave-absorbing board, which is composed of the following raw materials in parts by weight: 42-48 parts of polystyrene particles, 400-450 parts of water, 100-200 parts of a porous aerogel composite material modifier wrapped with a paraffin oil layer, 500-600 parts of HBSC cement, and 5-10 parts of a cellulose and starch ether compounded cellulose ether solution.

[0021] In the third aspect of the present invention, there is provided an aerogel-loaded inorganic composite polystyrene thermal insulation and wave-absorbing board prepared by the above method.

[0022] In the fourth aspect of the present invention, there is provided the application of the above aerogel-loaded inorganic composite polystyrene thermal insulation and wave-absorbing board in the high-grade building wallboard industry.

[0023] Advantages of the present invention

[0024] (1) First, the Wuxi Steel Ben CFJB-10L double planetary high-speed mixer with a stirring paddle with a silica gel sheet is used to reduce the influence of the breakdown of the polystyrene foam wrapped by the cellulose ether bonding film on the experimental results. The silica gel sheet is soft and wear-resistant, which can effectively reduce the frictional damage to the machine and reduce the noise pollution caused by friction; the unique transmission structure design ensures the stability of the thermal insulation material during the stirring process; at the same time, the double-axis stirring enables it to have a higher rotation speed and shear force, making the combination of the thermal insulation material modifier slurry and the polystyrene light particles wrapped by the cellulose ether bonding film more uniform.

[0025] (2) The porous aerogel composite material, which integrates high-end thermal conductivity reducing materials, wave-absorbing materials, and skeleton supports in the modifier, overcomes the reduction of the aerogel performance caused by the addition of the skeleton support. Hollow microspheres / porous ceramsite are also common materials in the contemporary high-temperature heat insulation system. The combination of the two can significantly reduce the thermal conductivity of the thermal insulation and wave-absorbing board. The paraffin oil layer seals the aerogel in the porous skeleton material to prevent it from overflowing during the stirring process, and also ensures that the thermal insulation and heat insulation performance of the final thermal insulation and wave-absorbing board will not be reduced during service. Secondly, it also improves the wave-absorbing performance of the thermal insulation board.

[0026] (3) Spraying the cellulose ether on the surface of the polystyrene foam particles and then mixing it with the modifier slurry can effectively improve the stability and cohesion of the mixing system.

[0027] (4) The dry density of the inorganic / organic composite Class A thermal insulation and wave-absorbing board of the present invention is about 115-120 kg / m 3 , the thermal conductivity is as low as 0.019-0.020 W / (m·K), the water absorption rate is less than 5%, the maximum tensile strength is 0.24 MPa, meeting the requirement of Class 060 ≥ 0.12 MPa, the maximum compressive strength is 0.58 MPa, meeting the requirement of Class 060 ≥ 0.2 MPa, wave frequencyf Maximum / minimum reflectivity Γ within 2~18GHz dB It has a range of -43.2 to -17.6 dB, and its comprehensive performance is excellent in high-end wall panel projects. It is practical and easy to promote.

[0028] (5) The preparation method of the present invention is simple, practical and easy to promote. Attached Figure Description

[0029] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. Exemplary embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0030] Figure 1 This is a flowchart of the fabrication process for an aerogel-loaded inorganic composite polystyrene thermal insulation and microwave absorbing board. Wherein, 1—HBSC; 2—Modifier for the aerogel-loaded porous composite material containing a paraffin oil layer; 3—Aerogel-loaded porous composite material; 4—Paraffin oil; 5—Aerogel composite material containing a paraffin oil layer; 6—Modifier; 7—Dry mixture; 8—Water; 9—Mixed slurry of the modifier for the aerogel-loaded porous composite material containing a paraffin oil layer and cement; 10—Cellulose; 11—Starch ether; 12—Cellulose ether solution; 13—Polystyrene particles; 14—Polystyrene particles with a cellulose ether layer membrane; 15—Polystyrene particle concrete; 16—Polystyrene thermal insulation and microwave absorbing board; I—Mixing; II—Spraying; III—Pouring and curing; A—Planetary mixer with a silica gel sheet agitator. Detailed Implementation

[0031] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0032] A method for preparing an aerogel-supported inorganic composite polystyrene Class A thermal insulation and microwave absorbing plate includes:

[0033] (1) The method of preparing hollow glass microsphere-aerogel composite material according to patent CN114736035A / preparing ceramic aerogel composite material according to patent CN101525248 first loads aerogel in rigid porous skeleton material microspheres, silica powder or zeolite powder.

[0034] (2) Then, the paraffin oil is mixed with the porous aerogel composite material to obtain the porous aerogel composite material with the paraffin oil layer. Subsequently, the paraffin-encapsulated porous aerogel composite material is dispersed in the cement-based modifier in a certain proportion.

[0035] (3) The cellulose and amylase are combined and water is added to prepare a cellulose ether solution, which is then sprayed onto the surface of polystyrene particles.

[0036] (4) First, put HBSC and the modifier of porous aerogel composite material containing paraffin oil layer into the mixing tank and dry mix for 5-10 minutes. Then, add water to the mixing tank with silicone sheet stirring paddle and stir for 1-2 minutes to obtain the mixture of modifier of aerogel loaded porous composite material containing paraffin oil layer and cement.

[0037] (5) Add the polystyrene particles from step (3) to the modifier of the aerogel-loaded porous composite material with paraffin oil layer obtained in step (4) and the cement slurry, and stir for 1-2 minutes to make the concrete slurry fully and evenly coat the surface of the polystyrene particles.

[0038] (6) After brushing oil on the inner surface of the mold, put the mixture of concrete slurry and polystyrene particles into the mold and compact it to a strength of 0.2-0.3 MPa for 10-15 minutes to make the surface smooth. Then cover the surface with plastic wrap and place it in a standard curing room for initial curing for 1 day. After that, demold it and place it for another 5-7 days for intermediate curing.

[0039] More specifically, it includes the following steps:

[0040] (1) First, put HBSC and the modifier of porous aerogel composite material containing paraffin oil layer into a mixing tank with a stirring paddle with silica gel sheet according to the proportion and dry mix for 5 minutes. Then, add water to the mixing tank according to the proportion and stir for 1.5 minutes to obtain the mixture of modifier of porous aerogel loaded with paraffin oil layer and cement.

[0041] (2) Add the polystyrene particles after spraying the cellulose ether solution to the modifier of the aerogel-loaded porous composite material with paraffin oil layer obtained in step (1) and the cement slurry, stir for 1-2 minutes, so that the concrete slurry is fully and evenly coated on the surface of the polystyrene particles.

[0042] (3) After brushing oil on the inner surface of the mold, put the mixture of concrete slurry and polystyrene particles into the mold and compact it to make the surface smooth. Then cover the surface with plastic wrap and place it in a non-ventilated room for initial curing for 2 days. After that, demold it and place it for another 5 days for intermediate curing.

[0043] In some embodiments, the compaction strength is 0.2-0.3 MPa and the compaction time is 10-15 min.

[0044] An aerogel-loaded inorganic composite polystyrene thermal insulation and microwave absorbing board is composed of the following raw materials in parts by weight: 42-48 parts of polystyrene particles, 400-450 parts of water, 100-200 parts of a porous aerogel composite material modifier containing a paraffin oil layer, 500-600 parts of HBSC cement, and 5-10 parts of a cellulose ether solution composed of cellulose and starch ether.

[0045] The cement is HBSC, which has the characteristics of fast setting speed, micro-expansion, and high strength, and can effectively improve the strength of the thermal insulation and wave-absorbing board; the porous aerogel composite material solves the problem that the density of the aerogel increases due to the skeleton support material, thereby reducing the performance of the aerogel, and effectively reduces the thermal conductivity of the inorganic composite polystyrene thermal insulation and wave-absorbing board; the cellulose and starch ether, after being compounded, the cellulose ether obtained by the two improves the stability and cohesiveness of the system, effectively improves the workability of the prepared slurry, and allows it to be fully hydrated and combined with the lightweight polystyrene particles.

[0046] More specifically, it is composed of the following raw materials in parts by weight: 42-48 parts polystyrene particles, 400-450 parts water, 100-200 parts porous aerogel composite material modifier containing a paraffin oil layer, 700-800 parts HBSC, and 5-10 parts (1:5) cellulose ether compounded from cellulose and starch ether.

[0047] In some embodiments, the ratio of cellulose to starch ether is 1:5.

[0048] In some embodiments, the HBSC cement is one of type 425 or 525 sulfoaluminate cement.

[0049] In some embodiments, the polystyrene particles have a density of 5 g / m³. 3 7g / m 3 One type of lightweight polystyrene granules with a particle size of 10-15mm.

[0050] In some embodiments, the water is tap water.

[0051] In some embodiments, the porous aerogel composite material modifier containing a paraffin oil layer is obtained by dispersing the porous aerogel composite material containing the paraffin oil layer in a cement-based modifier. The cement-based modifier is composed of the following raw materials in parts by weight: 100 parts of internal waterproofing agent, 64 parts of aerogel load skeleton support agent (porous aerogel composite material containing paraffin oil layer), 140 parts of binder, 4 parts of suspension modifier, 50 parts of reinforcing internal curing agent, 2 parts of early strength stabilizer, and a mixture of 750 parts of low-end thermal conductivity reducing materials.

[0052] In some embodiments, the mixture of low-end thermal conductivity reducing materials is zeolite, silicon powder, microspheres, etc.

[0053] In some embodiments, the intrinsic waterproofing agent is either Evonik SITRENP750 (Germany) or Cerico SEASTRIL303P (Italy);

[0054] In some embodiments, the binder is WACKER redispersible latex powder 5044N from Germany;

[0055] In some embodiments, the suspension modifier is Sika 530P polycarboxylate superplasticizer from Switzerland;

[0056] In some embodiments, the enhanced internal health agent is a mixture of Na2SiO3·9H2O and hydroxypropyl cellulose PMC in a 1:1 ratio;

[0057] In some embodiments, the aerogel-supported skeleton is a hollow glass microsphere-aerogel composite material / porous ceramic aerogel composite material containing a paraffin oil layer.

[0058] In some embodiments, the early strength stabilizer is calcium acetate, lithium sulfate, lithium carbonate, calcium formate, aluminum dihydrogen phosphate, etc.

[0059] In some embodiments, the aerogel-supported skeleton is a porous zeolite containing aerogel encapsulated with paraffin oil, polyether, or organosilicon, such as silica powder, microspheres, or porous ceramics.

[0060] This invention also provides an application of aerogel-loaded inorganic composite polystyrene Class A thermal insulation and wave-absorbing board in northern building exterior wall engineering: a 20mm thick aerogel-loaded inorganic composite polystyrene Class A thermal insulation and wave-absorbing board is hung between the exterior wall decorative panel and the aerated concrete wall with tie bars using a dry-hanging method.

[0061] The present invention will be further described in detail below with reference to specific embodiments. It should be noted that the specific embodiments are explanations of the present invention and not limitations thereof.

[0062] Blank Example: The insulation board prepared by the method in Example 3 of CN 114856010 A was used as a blank control group, including the following raw materials in parts by weight: 40 parts of polystyrene particles, 410 parts of water, 100 parts of modifier, and 800 parts of PO425 silicate cement.

[0063] The modifier consists of: 65 parts of skeleton support agent, 130 parts of binder, 4 parts of suspension modifier, 750 parts of low-end thermal conductivity reducing material, 50 parts of internal strengthening agent, and 1 part of early strength stabilizer.

[0064] Example 1: Preparation of a modified inorganic composite polystyrene grade A thermal insulation and microwave absorbing plate, comprising the following raw materials in parts by weight: 48 parts of polystyrene particles sprayed with cellulose ether solution, 450 parts of water, 100 parts of a modifier containing a paraffin oil layer-coated hollow glass microsphere-aerogel composite material, and 800 parts of HBSC.

[0065] The modifier is composed of the following raw materials in parts by weight: 100 parts of internal waterproofing agent (Evonik SITRENP750, Germany), 64 parts of aerogel load-bearing skeleton support agent (hollow glass microspheres-aerogel composite material wrapped in paraffin oil), 140 parts of binder (WACKER redispersible latex powder 5044N, Germany), 4 parts of suspension modifier (Sika 530P polycarboxylate superplasticizer, Switzerland), 50 parts of reinforcing internal conditioning agent (a 1:1 mixture of Na2SiO3·9H2O and hydroxypropyl cellulose PMC), 2 parts of early strength stabilizer (calcium acetate), and 750 parts of a mixture of low-end materials that reduce thermal conductivity (a mixture of zeolite, silica powder, and microspheres in a 1:1:1 ratio).

[0066] Example 2: Preparation of an aerogel-loaded inorganic composite polystyrene thermal insulation and microwave absorbing plate, comprising the following raw materials in parts by weight: 45 parts of polystyrene particles sprayed with cellulose ether solution, 420 parts of water, 150 parts of a modifier containing a paraffin oil layer-coated hollow glass microsphere-aerogel composite material, and 750 parts of HBSC.

[0067] The composition of the modifier is the same as in Example 1.

[0068] Example 3: Preparation of an aerogel-loaded inorganic composite polystyrene Class A thermal insulation and microwave absorbing plate, comprising the following raw materials in parts by weight: 48 parts of polystyrene particles sprayed with cellulose ether solution, 450 parts of water, 100 parts of a modifier containing a paraffin oil layer encapsulating porous ceramic aerogel composite material, and 800 parts of HBSC.

[0069] Among them, the modifier uses porous ceramic aerogel composite material aerogel wrapped with paraffin oil layer as the load skeleton support agent, and the rest is the same as in Example 1.

[0070] Example 4: Preparation of an aerogel-loaded inorganic composite polystyrene Class A thermal insulation and microwave absorbing plate, comprising the following raw materials in parts by weight: 45 parts of polystyrene particles sprayed with cellulose ether solution, 420 parts of water, 150 parts of modified porous ceramic aerogel composite material containing a paraffin oil layer, and 750 parts of HBSC.

[0071] Among them, the modifier uses porous ceramic aerogel composite material aerogel wrapped with paraffin oil layer as the load skeleton support agent, and the rest is the same as in Example 1.

[0072] Comparative Example 1: Preparation of an aerogel-loaded inorganic composite polystyrene Class A thermal insulation and microwave absorbing plate, comprising the following raw materials in parts by weight: 48 parts of polystyrene particles sprayed with cellulose ether solution, 450 parts of water, 100 parts of a modifier containing a paraffin-free layer-coated hollow glass microsphere-aerogel composite material, and 800 parts of HBSC.

[0073] In this case, the modifier uses a hollow glass microsphere-aerogel composite material (prepared by the same method as in Example 5) without paraffin oil coating as the aerogel load skeleton support agent, and the other components and amounts of the modifier are the same as in Example 1.

[0074] Comparative Example 2: Preparation of an inorganic / organic composite Class A thermal insulation and microwave absorbing panel, comprising the following raw materials in parts by weight: 48 parts of polystyrene particles sprayed with cellulose ether solution, 450 parts of water, 100 parts of modifier, and 800 parts of HBSC.

[0075] In this case, a porous ceramic aerogel composite material (prepared by the same method as in Example 5) without paraffin oil coating was used as the aerogel load skeleton support agent, and the other components and amounts of the modifier were the same as in Example 1.

[0076] Comparative Example 3: Preparation of an inorganic / organic composite Class A thermal insulation and microwave absorbing panel, comprising the following raw materials in parts by weight: 48 parts of polystyrene particles without cellulose ether solution sprayed, 450 parts of water, 100 parts of modifier, and 800 parts of HBSC.

[0077] In this case, a porous ceramic aerogel composite material (prepared by the same method as in Example 5) without paraffin oil coating was used as the aerogel load skeleton support agent, and the other components and amounts of the modifier were the same as in Example 1.

[0078] Comparative Example 4: Preparation of an inorganic / organic composite Class A thermal insulation and microwave absorbing panel, comprising the following raw materials in parts by weight: 48 parts of polystyrene particles without cellulose ether solution sprayed, 450 parts of water, 100 parts of a modifier containing a paraffin oil layer encapsulating porous ceramic aerogel composite material, and 800 parts of HBSC.

[0079] Example 5: The preparation method of the inorganic composite polystyrene Class A thermal insulation and microwave absorbing plate described in Examples 1 to 4 and Comparative Examples 1 and 2 includes the following steps:

[0080] (1) Hollow glass microsphere-aerogel composite material is prepared by the method of Example 1 in patent CN114736035A / the method of preparing porous ceramic aerogel composite material in Example 1 in patent CN101525248, namely: firstly, aerogel is loaded in rigid porous skeleton support microspheres, silica powder or zeolite powder.

[0081] (2) Then, the paraffin oil and the porous aerogel composite material prepared in step (1) are mixed at a weight ratio of 3:5 to obtain the porous aerogel composite material with paraffin oil layer. Subsequently, the paraffin-encapsulated porous aerogel composite material is dispersed in the cement-based modified material in a certain proportion.

[0082] (3) The cellulose and amylase are compounded (the ratio of cellulose to starch ether is 1:5), and water is added to prepare a cellulose ether solution with a concentration of 2%. The cellulose ether solution is then sprayed onto the surface of polystyrene particles.

[0083] (4) First, put HBSC and the modifier of porous aerogel composite material containing paraffin oil layer into the mixing tank and dry mix for 8 minutes. Then, add water to the mixing tank with silicone sheet stirring paddle and stir for 2 minutes to obtain the mixture of modifier of aerogel loaded porous composite material containing paraffin oil layer and cement.

[0084] (5) Add the polystyrene particles from step (3) to the modifier of the aerogel-loaded porous composite material with paraffin oil layer obtained in step (4) and the cement slurry, and stir for 1 minute to make the concrete slurry fully and evenly coat the surface of the polystyrene particles.

[0085] (6) After brushing oil on the inner surface of the mold, put the mixture of concrete slurry and polystyrene particles into the mold and compact it to a strength of 0.2 MPa for 12 minutes to make the surface smooth. Then cover the surface with plastic wrap and place it in a standard curing room for initial curing for 1 day. After that, demold it and place it for another 7 days for intermediate curing.

[0086] Example 6: The following is an experimental method for testing the performance of a modified inorganic / organic composite Class A thermal insulation and wave-absorbing panel:

[0087] The dry density, water absorption rate, and compressive strength of the thermal insulation and wave-absorbing panels were tested in accordance with the specifications of "Foamed Concrete" JG / T266-2011 and "Test Methods for Performance of Foamed Concrete Products" (JC / T2357-2016). The dry density, water absorption rate, and compressive strength of inorganic / organic composite Class A thermal insulation and wave-absorbing panels with different mix ratios were tested sequentially using the weighing method, the saturation method, and the pressure method. The specimen size was 100mm×100mm×100mm cube specimens. The number of test groups was determined according to the product characteristics, with each group containing 3 specimens.

[0088] Thermal conductivity test: The test method shall comply with the provisions of GB / T 10294 for the testing of thermal conductivity / thermal resistance of insulation materials. After the specimen is dried, the thermal conductivity of the insulation and absorbing plate shall be measured by the flat plate thermal conductivity method. The specimen size is a 300mm×300mm×30mm cubic specimen, and the number of specimens in each group is 3.

[0089] Drying shrinkage test: Referring to the specifications of "Test Methods for Performance of Foamed Concrete Products" (JC / T2357-2016), the drying shrinkage performance of inorganic / organic composite Class A thermal insulation and wave-absorbing boards with different mix ratios and curing ages was measured using the length comparator method. The specimen size was 40 mm × 40 mm × 160 mm, and the number of specimens in each group was 3.

[0090] Reflectivity Testing: According to the national military standard GJB2038A-2011, the reflectivity testing methods for radar absorbing materials (RAM) include the radar cross section (RCS) test method and the bow-shaped test method. The bow-shaped test method is used to test the maximum / minimum reflectivity of the sample. The sample size is 200mm×200mm×25mm. The test radar bands include the X-band and Ku-band (2~18GHz). The samples are dried before testing. Three samples are used in each group, and the experimental result is the average of the three samples.

[0091] Table 1 Comparison of physical properties of several thermal insulation and wave-absorbing panel examples

[0092]

[0093] Experimental tests showed that all four embodiments described above can be improved based on CN 114856010 A. The introduction of the paraffin oil-coated hollow glass microsphere-aerogel composite material / ceramic aerogel composite material significantly reduced the dry density of the thermal insulation and absorbing plate, with a maximum reduction of over 10%. The thermal conductivity of the thermal insulation and absorbing plate decreased by approximately 40% or more. The tensile and compressive strengths were slightly improved, with a maximum tensile strength of 0.24 MPa, meeting the 060 grade requirement of ≥0.12 MPa, and a maximum compressive strength of 0.55 MPa, meeting the 060 grade requirement of ≥0.2 MPa. The volumetric water absorption rate was less than 5%. The indoor radar cross section (RCS) reflectivity method was used (the radar band includes the X-band and Ku-band, and meets the requirements). f ≥ cL / 2D 2 (Requirement) Measure the maximum / minimum reflectance Γ of the product. dB The wavelength range is -43.2 to -17.6 dB (wave frequency f ∈ 2-18 GHz). Further performance improvements were achieved while meeting the manufacturing standards for Class A thermal insulation and microwave absorbing panels of inorganic / organic composite materials.

[0094] Meanwhile, it can be seen that spraying cellulose ether onto the surface of polystyrene foam particles and then mixing it with the modifier slurry improves the stability and cohesiveness of the mixture system. As the bonding strength increases, the strength of the resulting insulation board is improved. At the same time, the pores between the particles are more compact, the insulation effect is improved, and the thermal conductivity is reduced.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing an aerogel-supported inorganic composite polystyrene Class A thermal insulation and microwave absorbing plate, characterized in that, include: By loading aerogels onto a rigid porous framework material, porous aerogel composite materials are obtained. Paraffin oil is mixed with the porous aerogel composite material to obtain a porous aerogel composite material coated with a paraffin oil layer. The porous aerogel composite material coated with the paraffin oil layer is dispersed in a cement-based modifier to obtain a modifier containing a porous aerogel composite material coated with a paraffin oil layer. The cement-based modifier is composed of the following raw materials in parts by weight: 100 parts of internal waterproofing agent, 64 parts of aerogel load-bearing skeleton support agent, 140 parts of binder, 4 parts of suspension modifier, 50 parts of reinforcing internal curing agent, 2 parts of early strength stabilizer, and a mixture of 750 parts of low-end thermal conductivity reducing materials. The aerogel load-bearing skeleton support agent is a hollow glass microsphere-aerogel composite material coated with a paraffin oil layer or a porous ceramic aerogel composite material coated with a paraffin oil layer. The mixture of low-end thermal conductivity reducing materials is zeolite, silica powder, and microspheres, with a mixing ratio of 1:1:

1. Cellulose and starch ether are compounded and water is added to prepare a cellulose ether solution. The cellulose ether solution is then sprayed onto the surface of polystyrene foam particles to obtain polystyrene foam particles with an adhesive cellulose ether film layer. HBSC cement and a modifier of porous aerogel composite material containing a paraffin oil layer are placed in a mixing tank and dry-mixed for 5-10 minutes. Then, water is added according to the ratio and the mixture is stirred for 1-2 minutes in a mixing tank with a silicone rubber agitator to obtain a slurry of modifier of aerogel loaded porous composite material containing a paraffin oil layer and cement. The polystyrene foam particles with the cellulose ether adhesive film layer and the modifier of the aerogel-loaded porous composite material wrapped with paraffin oil layer are mixed evenly with cement slurry, molded, initially cured, demolded, and then cured in the middle stage to obtain the final product.

2. The method for preparing aerogel-loaded inorganic composite polyphenyl A-grade thermal insulation and wave-absorbing plate according to claim 1, characterized in that, The molding strength is 0.2-0.3 MPa, and the molding time is 10-15 min.

3. The aerogel supported inorganic composite polyphenyl A-grade thermal insulation and wave absorption plate prepared by the method of claim 1 or 2, characterized in that, It is composed of the following raw materials in parts by weight: 42-48 parts polystyrene foam particles, 400-450 parts water, 100-200 parts modifier of porous aerogel composite material containing paraffin oil layer, 500-600 parts HBSC cement, and 5-10 parts cellulose ether solution.

4. The aerogel-loaded inorganic composite polyphenyl A-grade thermal insulation and wave-absorbing panel according to claim 3, characterized in that, The HBSC cement is one of the 425 and 525 type sulfoaluminate cements.

5. The aerogel-loaded inorganic composite polyphenyl A-grade thermal insulation and wave-absorbing panel according to claim 3, characterized in that, The polystyrene foam particles have a density of 5 g / m³. 3 Lightweight polystyrene foam particles with a particle size of 10-15 mm; or, the polystyrene foam particles with a density of 7 g / m³. 3 Lightweight polystyrene foam particles with a particle size of 10-15mm.

6. The aerogel-loaded inorganic composite polyphenyl A-grade thermal insulation and wave-absorbing panel according to claim 3, characterized in that, The water in question is tap water.

7. The aerogel-loaded inorganic composite polyphenyl A-grade thermal insulation and wave-absorbing panel according to claim 3, characterized in that, The internal waterproofing agent is Evonik SITRENP750 from Germany; Alternatively, the binder may be German WACKER redispersible latex powder 5044N; Alternatively, the suspension modifier may be Sika 530P polycarboxylate superplasticizer from Switzerland; Alternatively, the enhanced internal health-preserving agent is a mixture of Na2SiO3·9H2O and hydroxypropyl cellulose in a 1:1 ratio.

8. The application of the aerogel-loaded inorganic composite polystyrene Class A thermal insulation and wave-absorbing board as described in claim 3 in the building wall panel industry.

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