CN215974987U

CN215974987U - Aerogel articles

Info

Publication number: CN215974987U
Application number: CN202122436190.XU
Authority: CN
Inventors: 周昌兵; 王超; 许湘; 刘韶浦; 叶佳英; 骆菁; 王艺璇; 余盛锦
Original assignee: Nano Tech Co ltd
Current assignee: Nano Tech Co ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2022-03-08
Anticipated expiration: 2031-10-08

Abstract

The application discloses aerogel goods belongs to building materials technical field. An aerogel product comprises a porous hard substrate, wherein the porous hard substrate is provided with a plurality of holes, and aerogel is filled in the holes; the porosity of the porous hard substrate is not less than 20%. The application can solve the problem that the performance of each aspect of the current building insulation board is not good.

Description

Aerogel articles

Technical Field

The application belongs to the technical field of building materials, concretely relates to aerogel goods.

Background

The building insulation board can reduce the indoor heat of the building to be emitted to the outdoor by taking measures for the building envelope structure, so that the indoor temperature of the building can be kept. Besides, some building insulation boards also have the characteristics of water resistance, flame retardance and the like. However, some current building insulation boards are not ideal in the aspects of insulation effect, waterproof effect, strength and the like.

SUMMERY OF THE UTILITY MODEL

The purpose of this application embodiment is to provide an aerogel goods, can solve the problem that present building insulation board is ideal inadequately in the aspect of insulation effect, water-proof effects, intensity etc..

In order to solve the technical problem, the present application is implemented as follows:

an embodiment of the present application provides an aerogel product, including:

the porous hard substrate is provided with a plurality of holes, and aerogel is filled in the holes;

the porosity of the porous hard substrate is not less than 20%.

In the embodiment of the present application, since the porous hard substrate has a plurality of holes, the aerogel is filled in the plurality of holes to obtain the aerogel product. For improving aerogel filling amount, the porosity of the porous hard base material is designed to be not less than 20%, so that convenience can be provided for filling the aerogel, and the aerogel filling amount is increased. Based on above-mentioned setting, can make more aerogels fill in the hole of porous stereoplasm substrate to can improve thermal-insulated, waterproof, fire-retardant etc. aspect performance of aerogel goods, and, owing to adopt porous stereoplasm substrate as the base member, improved the intensity of aerogel goods.

Drawings

FIG. 1 is a schematic illustration of the structure of an aerogel article as disclosed in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a first porous hard substrate disclosed in embodiments herein;

fig. 3 is a schematic structural diagram of a second porous hard substrate disclosed in the examples of the present application.

Reference numerals:

100-a porous hard substrate;

200-aerogel.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

As shown in fig. 1 to 3, the present embodiment discloses an aerogel product, which includes a porous hard substrate 100, wherein the porous hard substrate 100 has a plurality of holes, and the plurality of holes are filled with aerogel 200.

It can be understood that the porous hard substrate 100 is a relatively large-hardness base body, the aerogel product manufactured by using the porous hard substrate 100 as the base body has large hardness and is not easy to deform, the strength of the aerogel product is improved to a certain extent, the aerogel product is not easy to damage, and the service life of the aerogel product is ensured.

To form the aerogel article, a plurality of holes are provided in the porous rigid substrate 100 through which the aerogel 200 can be filled to bond the aerogel 200 to the porous rigid substrate 100 to form the aerogel article. Based on this, on the one hand, the aerogel goods has the characteristic of porous stereoplasm substrate 100 to guarantee higher intensity, and on the other hand, the aerogel goods has aerogel 200 characteristic, thereby makes the aerogel goods have preferred thermal insulation performance, waterproof performance and fire behaviour etc..

Alternatively, the porous hard substrate 100 may be designed by way of a foaming agent, physical aeration, or particle packing to create a porous structure. The method specifically comprises the following steps: the porous structure may be a honeycomb structure caused by a foaming agent; may be a porous structure produced by aeration in cement mortar or other cementitious materials; or the gaps generated by the accumulation of the particles, and the particles are fixed by the bonding of the adhesive.

Optionally, the porous hard substrate 100 has a plurality of sub-regions distributed from the center to the outside in sequence, and in adjacent sub-regions, the sub-region near the outside is disposed around the sub-region near the inside, and the shapes of the holes in the adjacent sub-regions are different, and the density of the holes is also different.

Based on the above arrangement, the density of the holes in the sub-region close to the outer side is higher, which is beneficial to improving the overall strength of the porous hard substrate 100 and avoiding the deformation of the sub-region close to the outer side due to the interference. In addition, the holes in different sub-areas have different shapes, so that the shapes of the holes can be conveniently designed in different areas.

In order to increase the loading of the aerogel 200, in the embodiment of the present application, the porosity of the porous hard substrate 100 is not less than 20%, specifically including 20%, 25%, 30%, 50%, and the like, and of course, other porosities may also be included, and the porosity in the embodiment of the present application is not particularly limited.

It should be noted here that the porosity of the porous hard substrate 100 can also be understood as the volume ratio of the plurality of pores, and a high porosity (i.e., a high proportion of the pore volume) can facilitate the introduction of the aerogel 200, and the higher the porosity is, the more favorable the filling of the aerogel 200 is, and the higher the filling amount of the aerogel 200 is, so that the aerogel product has better thermal insulation performance, waterproof performance, flame retardant performance, and the like.

Based on the above arrangement, more aerogel 200 can be filled into the plurality of holes of the porous hard substrate 100, so that the thermal conductivity of the aerogel product can be reduced, and the heat insulation performance is improved; meanwhile, the aerogel 200 fills a plurality of holes of the porous hard substrate 100, so that the waterproof performance and the flame retardant performance can be improved; in addition, because the porous hard base material 100 is used as a matrix, the strength of the aerogel product can be improved, and the service life of the aerogel product is prolonged.

Optionally, the porous hard substrate 100 has a porosity of 25% to 95%. The method specifically comprises the following steps: 25%, 30%, 35%, 50%, 70%, 80%, 95%, etc. The specific value of the porosity of the porous hard substrate 100 is not limited in the examples of the present application as long as the actual requirements are satisfied. For example, when a better heat insulation effect, waterproof effect, and flame retardant effect are required, the porous hard substrate 100 with higher porosity can be selected, so that more aerogel 200 can be filled, and a better effect can be achieved; conversely, a porous hard substrate 100 having a relatively low porosity is selected.

Alternatively, the pores of the porous hard substrate 100 may include at least one of micron-sized pores and millimeter-sized pores. The method specifically comprises the following steps: the holes may include micro-scale holes or millimeter-scale holes, or both micro-scale holes and millimeter-scale holes, and the aerogel 200 filled into the holes has a nano-scale porous structure. Based on this, the aerogel 200 and the porous hard substrate 100 jointly form a millimeter-micron-nanometer multi-scale hole structure, so that better heat insulation, waterproof, flame retardant and other effects can be achieved. It should be noted here that the micro-pores, the millimeter-pores and the nano-porous structures can be understood as the pores with the sizes of micro-scale, millimeter-scale and nano-scale.

Alternatively, the porous hard substrate 100 may be a plate-like substrate or a brick-like substrate having a porous structure. Among them, the plate-like substrate having a porous structure may be a foamed cement board, a foamed ceramic board, a foamed glass board, a foamed concrete board, a gypsum board, or the like. The brick-shaped base material with the porous structure can be a foam brick, an air-added brick, a sponge brick, a water permeable brick and the like. Of course, the specific form of the porous hard substrate 100 is not limited in the embodiments of the present application as long as the process requirements are satisfied.

After filling the aerogel 200 in the various forms of porous rigid substrates 100, aerogel articles are formed comprising: aerogel foam cement board, aerogel foam brick, aerogel air entrainment brick, aerogel sponge brick, aerogel foam ceramic board, the permeable brick of aerogel, aerogel foam glass board, at least one of aerogel foam concrete board and aerogel gypsum board. The aerogel products in various forms can be used as building materials, so that the building is guaranteed to have better performances of heat preservation, water resistance, flame retardance and the like, and higher strength is achieved, and the requirements of the building materials are met.

Alternatively, the porous rigid substrate 100 has a plurality of holes in a honeycomb shape, and the aerogel 200 is filled into the plurality of holes in the honeycomb shape to form the aerogel product. For example, the porous rigid substrate 100 may be a honeycomb ceramic plate having a honeycomb-shaped hole. In addition, other panels or bricks with cellular pores are also possible. Here, it should be noted that the cellular pores on the porous hard substrate 100 may be formed by using a foaming agent in the process of manufacturing the porous hard substrate 100.

Alternatively, the plurality of holes of the porous hard substrate 100 may be a combination of at least one of a triangle, an ellipse, a rectangle, a pentagon, a circle, and a hexagon. When the plurality of pores are formed in various shapes, the porous hard substrate 100 can be distributed by making full use of the space.

Alternatively, the plurality of holes may be distributed in a regular form, and may also be distributed in an irregular form.

Alternatively, aerogel 200 may be made by a sol-gel process. The sol-gel method is characterized in that a compound containing high chemical activity components is used as a precursor, the raw materials are uniformly mixed in a liquid phase, hydrolysis and condensation chemical reactions are carried out, a stable transparent sol system is formed in a solution, the sol is slowly polymerized among colloidal particles after aging to form gel with a three-dimensional network structure, and a solvent losing fluidity is filled among gel grids to form the gel. The specific process can refer to the related art and is not described in detail herein.

Alternatively, the aerogel 200 may be filled into the pores of the porous hard substrate 100 by a syringe injection method. Such an approach may be referred to in the art and will not be described in detail herein.

Alternatively, the aerogel article can have a density of 200kg/m³～380kg/m³. The method specifically comprises the following steps: 200kg/m³、250kg/m³、280kg/m³、300kg/m³、350kg/m³、380kg/m³And the like, the density value of the aerogel product is not limited in the examples of the present application. It can be seen that the aerogel products provided by the embodiments of the present application have relatively low density to reduce weight.

Optionally, the aerogel article has a thermal conductivity of from 0.019W/(m.K) to 0.025W/(m.K). The method specifically comprises the following steps: 0.019W/(m.K), 0.02W/(m.K), 0.021W/(m.K), 0.022W/(m.K), 0.023W/(m.K), 0.024W/(m.K), 0.025W/(m.K) and the like, and specific values of the thermal conductivity of the aerogel product are not limited in the examples of the present application. Therefore, the aerogel product provided by the embodiment of the application has relatively small thermal conductivity coefficient so as to ensure the heat insulation effect.

Optionally, the aerogel product has a compressive strength of 1.6Mpa to 6.0 Mpa. The method specifically comprises the following steps: 1.6Mpa, 2.0Mpa, 2.4Mpa, 2.8Mpa, 3.0Mpa, 3.4Mpa, 3.8Mpa, 4.0Mpa, 4.5Mpa, 5.0Mpa, 5.5Mpa, 6.0Mpa, etc., and specific values of the compressive strength of the aerogel product are not limited in the examples of the present application. Therefore, the aerogel product provided by the embodiment of the application has relatively large compressive strength so as to ensure that the aerogel product is not easy to damage.

Optionally, the aerogel article has a hydrophobe between 99.2% and 99.7%. The method specifically comprises the following steps: 99.2%, 99.3%, 99.4%, 99.5%, 99.6%, 99.7%, etc., and the specific values of the hydrophobic character of the aerogel article are not limited in the examples herein. Therefore, the aerogel product provided by the embodiment of the application has relatively large hydrophobic rate so as to ensure the waterproof effect.

Optionally, the aerogel article has a volumetric water absorption of 0.02% to 0.04%. The method specifically comprises the following steps: 0.02%, 0.025%, 0.03%, 0.035%, 0.04%, etc., and the specific value of the volumetric water absorption of the aerogel product is not limited in the examples of this application. Therefore, the aerogel product provided by the embodiment of the application has relatively small volume water absorption rate so as to ensure the waterproof effect.

Alternatively, the aerogel article can be a silica aerogel slab or a silica aerogel brick. The silica aerogel plate or the silica aerogel brick can be used as a heat-insulating, waterproof and flame-retardant material, and is applied to the field of buildings so as to keep the indoor temperature in brief and play a good role in water resistance and flame retardance.

The embodiment of the application also discloses a preparation method for preparing the aerogel product, and the disclosed preparation method comprises the following steps:

mixing a silicon source precursor with a catalyst to obtain a mixed solution;

filling the mixed solution into at least part of holes of a porous hard substrate, and standing for gelation to obtain a wet gel-filled hard substrate;

and drying the hard substrate filled with the wet gel to obtain the aerogel product.

Alternatively, the silicon source precursor may be water glass. Wherein sodium silicate is commonly called sodium silicate, is an inorganic substance and has a chemical formula of Na₂O·nSiO₂The water solution is commonly called water glass and is an ore binder. In the embodiment of the present application, water glass is used as a silicon source precursor to prepare the aerogel, and in addition, other substances may also be used as the silicon source precursor.

Alternatively, the catalyst may be an acidic material, such that when the silicon source precursor is mixed with the catalyst, the two chemically react to provide a mixed solution.

In this application embodiment, regard as the substrate of preparation aerogel goods with porous stereoplasm substrate because porous stereoplasm substrate has a plurality of holes for mixed solution can fill at least part hole of porous stereoplasm substrate, so that carry out the shutoff to the hole of porous stereoplasm substrate.

It is understood that the above-mentioned at least part of the holes may be all holes filled with the mixed solution, or a part of the holes may be filled with the mixed solution while another part of the holes is not filled. However, in order to ensure the overall performance of the aerogel product, the mixed solution is usually used to fill all the holes, so as to obtain the aerogel product with better performance.

After the mixed solution is filled into the pores of the porous hard substrate, it is required to stand for a certain period of time to allow the mixed solution to gel. And after the solution is mixed for gelation, obtaining a hard base material filled with wet gel, and drying the wet gel to finally obtain the hard base material filled with dry gel, namely obtaining the aerogel product.

It is noted herein that the method of making the aerogel product can include an aging step in addition to the steps described above. Specifically, after the step of standing the gel to obtain the wet gel-filled hard substrate, before the step of drying the wet gel-filled hard substrate, the wet gel-filled hard substrate may be aged at 60 ℃ for 3 to 5 hours to change the physical structure or chemical structure of the wet gel.

Compared with aerogel plates prepared by mechanically mixing various raw materials with prepared aerogel powder, the aerogel product prepared by the preparation method of the aerogel product provided by the embodiment of the application has better heat insulation performance, waterproof performance, flame retardant performance and the like, and has higher strength, so that the aerogel plate is not easy to deform or damage. Therefore, the composite material meets the use requirements of some current building materials.

In some embodiments, the step of mixing the silicon source precursor with the catalyst comprises: mixing water glass and an acidic catalyst, wherein the silicon source precursor is water glass, and the catalyst is an acidic catalyst, so that the water glass can be subjected to chemical reaction under an acidic condition to obtain a mixed solution containing silicon dioxide when the silicon source precursor is mixed with the catalyst, and the silicon dioxide wet gel can be formed after standing for a period of time.

The acidic catalyst may include at least one of hydrochloric acid, nitric acid, sulfuric acid, acetic acid and oxalic acid, that is, may be in the form of one or a combination of acids to provide acidic conditions for the water glass. Of course, the specific form of the acidic catalyst is not limited in the examples of the present application.

In other embodiments, the step of mixing the silicon source precursor with the catalyst comprises: hydrolyzing the silicon source precursor under an acidic condition to obtain a silicon source precursor aqueous solution, and mixing the silicon source precursor aqueous solution with an alkaline catalyst.

Alternatively, the silicon source precursor may include at least one of methyl orthosilicate, ethyl orthosilicate, methyltrimethoxysilane, dimethyldimethoxysilane, trimethylmethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, and trimethylethoxysilane. The one or more types of silicon source precursors described above may be hydrolyzed under acidic conditions to obtain a silicon source precursor solution.

Alternatively, the acidic solution comprises at least one of hydrochloric acid, nitric acid, sulfuric acid, acetic acid, and oxalic acid, i.e., one or a combination of acids may be employed to obtain an acidic solution that provides acidic conditions for hydrolysis of the silicon source precursor. Of course, the specific form of the acidic solution is not limited in the examples of the present application.

Alternatively, the basic catalyst may comprise at least one of sodium hydroxide, sodium carbonate, sodium bicarbonate, aqueous ammonia, potassium hydroxide, and potassium carbonate, i.e., may take the form of a base or a combination of bases to provide basic conditions for the aqueous silicon source precursor solution. Of course, the specific form of the basic catalyst is not limited in the examples of the present application.

Optionally, the temperature of the standing gel may be 10 ℃ to 60 ℃, and specifically includes: 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃ and the like, and of course, other temperature values are included, and the specific temperature value of the standing gel is not limited in the embodiment of the application as long as the process requirements can be met.

Besides ensuring the temperature, the standing time is also required to be ensured, and in the embodiment of the application, the standing time can be 10 seconds to 48 hours. The specific standing time may be determined according to the characteristics of the mixed solution. For example, different silicon sources are mixed with different catalysts to obtain different kinds of mixed solutions, and the solutions have different characteristics, namely high partial gelling speed and low partial gelling speed.

Based on the gel temperature and the gel time, the mixed solution of the silicon source and the catalyst can be ensured to gel smoothly after being poured into the porous hard base material 100, so that the hard base material filled with wet gel is obtained; and then drying to obtain the required aerogel product.

Optionally, the step of drying comprises: at least one of supercritical drying, subcritical drying, atmospheric drying, vacuum drying and freeze drying.

The temperature of the normal pressure drying may be 50 ℃ to 200 ℃, specifically including 50 ℃, 75 ℃, 90 ℃, 100 ℃, 120 ℃, 150 ℃, 180 ℃, 200 ℃ and the like, and of course, other temperature values may also be included.

Besides, the drying time needs to be ensured, and in the embodiment of the application, the drying time can be 3 hours to 24 hours. The specific drying time may be determined according to the characteristics of the wet gel. For example, different types of wet gels have different characteristics, with a faster drying rate for a portion of the wet gel and a slower drying rate for a portion of the wet gel.

Based on the above drying temperature and drying time, it can be ensured that the wet gel forms aerogel 200 after drying, and finally the desired aerogel product is formed.

In some embodiments, when the wet gel-filled hard substrate is dried by an atmospheric drying method, the preparation method further comprises, after the step of standing the gel to obtain the wet gel-filled hard substrate and before the step of drying the wet gel-filled hard substrate: and (3) washing and modifying the hard substrate filled with the wet gel. The steps of washing and modifying the hard base material filled with the wet gel are specifically as follows:

the washing step can be washing with an alcohol solvent at 50-80 ℃ for 2-8 hours. Alternatively, the hard substrate filled with the wet gel may be soaked in ethanol in a soaking manner, and preferably, the hard substrate filled with the wet gel may be soaked in ethanol which flows circularly. In order to meet the washing requirements, the washing process can be repeatedly operated for 1-3 times so as to meet the process requirements.

The modification step may be to soak the hard base material filled with wet gel with a modifier at 50 to 80 ℃ for 2 to 8 hours. Alternatively, the modifier may include at least one of trimethylchlorosilane, hexamethyldisilazane, and hexamethyldisiloxane. For example, the hard substrate filled with wet gel is soaked by using trimethylchlorosilane, and preferably, the hard substrate filled with wet gel can be soaked in the circularly flowing trimethylchlorosilane to meet the modification requirement.

Alternatively, the temperature of supercritical drying may be 40 ℃ to 70 ℃, specifically including 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃, 65 ℃, 70 ℃ and the like, and of course, other temperature values may also be included, and the specific temperature value of supercritical drying is not limited in the embodiment of the present application.

The pressure for supercritical drying is 15Mpa to 25Mpa, specifically including 15Mpa, 17Mpa, 20Mpa, 22Mpa, 25Mpa, and the like, and of course, other pressure values may be included, and the specific pressure value for supercritical drying is not limited in the embodiment of the present application.

In addition, it is necessary to ensure the time for the supercritical drying, and in the present embodiment, the time for the supercritical drying is 4 to 10 hours. The specific drying time may depend on the characteristics of the wet gel. For example, different types of wet gels have different characteristics, with partially wet gels drying faster at supercritical levels and partially wet gels drying slower at supercritical levels.

Based on the above supercritical drying temperature, pressure and time, the wet gel can be ensured to form aerogel after being subjected to supercritical drying, and finally the required aerogel product is formed.

Example 1:

the preparation method of the aerogel product is used for preparing the aerogel brick and comprises the following specific process steps:

under the condition that the room temperature is 25 ℃, using water glass as a precursor and oxalic acid as a catalyst, adjusting the pH of a water glass solution to be 3.0, then pouring the mixed solution into the holes of the water permeable brick, standing for about 25 minutes, and filling the holes of the water permeable brick with sol-gel; soaking the permeable brick filled with the wet gel in ethanol at 80 ℃ for 3 hours, and then performing soaking modification on the permeable brick filled with the wet gel by using trimethylchlorosilane, wherein the modification conditions are as follows: the temperature is 80 ℃ and the time is 2 hours; and finally, placing the modified permeable brick filled with the wet gel in a fume hood for natural drying for 3 days to obtain the aerogel brick.

According to the test of GB/T34336-³5.6Mpa compressive strength, and hydrophobicityThe percentage was 99.7%, the water absorption by volume was 0.02%, and the class A fire resistance, in addition, the in-plane tensile strength was 8.3 MPa.

Based on the test results, the aerogel brick in the embodiment of the application has the advantages of good heat insulation performance, waterproof performance and flame retardant performance, high strength, good safety and the like, and meets the use requirements of the current building materials.

Example 2:

the specific process steps for preparing the aerogel foamed cement board by adopting the preparation method of the aerogel product are as follows:

200ml of distilled water, 800ml of ethanol and 135ml of dimethyldiethoxysilane are weighed and poured into a flask, 2ml of 1mol/L hydrochloric acid is added, the mixture is heated to 50 ℃, stirred and hydrolyzed for 8 hours at the temperature of 50 ℃, and naturally cooled to room temperature to obtain the precursor. Mixing 500ml of hydrolyzed precursor with 0.2mol/L sodium carbonate solution at room temperature, pouring the mixed solution into the holes of the foamed cement board, standing for 15 minutes, and filling the holes of the foamed cement board with sol-gel; and (3) carrying out supercritical drying on the foamed cement board filled with the wet gel for 8 hours at the temperature of 64 ℃ and under the pressure of 17Mpa to obtain the aerogel foamed cement board.

According to the test of GB/T34336-³The sheet had a compressive strength of 2.9MPa, a water repellency of 99.2%, a volume water absorption of 0.04%, and a class A fire resistance, and also had an in-plane tensile strength of 5.2 MPa.

Based on above-mentioned test result can know, aerogel foaming cement board in this application embodiment has thermal insulation performance, waterproof performance, the fire behaviour of preferred, and intensity is big, security advantage such as good, satisfies current building material's operation requirement.

Example 3:

the specific process steps for preparing the aerogel honeycomb ceramic plate by adopting the preparation method of the aerogel product are as follows:

200ml of distilled water, 800ml of ethanol, 275ml of methyltriethoxysilane and 55ml of ethyl orthosilicate are weighed and poured into a flask, 3.2ml of 1mol/L hydrochloric acid is added, the mixture is heated to 60 ℃, stirred and hydrolyzed for 5 hours at the temperature of 60 ℃, and naturally cooled to room temperature to obtain the precursor. Mixing 500ml of hydrolyzed precursor with 0.1mol/L sodium hydroxide solution at room temperature, pouring the mixed solution into holes of the honeycomb ceramic plate, standing for 30 minutes, and filling the holes of the honeycomb ceramic plate with sol-gel; and carrying out supercritical drying on the honeycomb ceramic plate filled with the wet gel for 6 hours at 70 ℃ and 15Mpa to obtain the aerogel honeycomb ceramic plate.

According to the test of GB/T34336-2017, the thermal conductivity coefficient of the aerogel honeycomb ceramic plate is 0.02317W/(m.K), and the density is 299.6kg/m³The sheet had a compressive strength of 4.9MPa, a water repellency of 99.3%, a volume water absorption of 0.04%, and a class A fire resistance, and also had an in-plane tensile strength of 7.2 MPa.

Based on above-mentioned test result can know, aerogel honeycomb ceramic plate in this application embodiment has thermal insulation performance, waterproof performance, the fire behaviour of preferred, and intensity is big, security advantage such as good, satisfies current building material's operation requirement.

In summary, in the embodiment of the present application, the aerogel product prepared by the above preparation method has good heat insulation performance, waterproof performance, flame retardant performance, and high strength, and is suitable for building materials.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An aerogel article, comprising: the porous hard substrate is provided with a plurality of holes, and aerogel is filled in the holes;

the porosity of the porous hard substrate is not less than 20%.

2. The aerogel article of claim 1, wherein the porous rigid substrate has a porosity of 25% to 95%.

3. The aerogel article of claim 1, wherein the pores comprise micron-sized pores and/or millimeter-sized pores;

the aerogel filled in the holes is of a nano-scale porous structure.

4. The aerogel article of claim 1, wherein the porous rigid substrate has a honeycomb shape of the plurality of pores.

5. The aerogel article of claim 1, wherein the aerogel is made by a sol-gel process.

6. Aerogel product according to any of claims 1 to 5, characterized in that it satisfies at least one of the following characteristics:

(a) the aerogel product has a density of 200kg/m³～380kg/m³；

(b) The thermal conductivity coefficient of the aerogel product is 0.019W/(m.K) -0.025W/(m.K);

(c) the compression strength of the aerogel product is 1.6MPa to 6.0 MPa;

(d) the hydrophobic rate of the aerogel product is 99.2% -99.7%;

(e) the volume water absorption rate of the aerogel product is 0.02-0.04%.

7. Aerogel product according to any of claims 1 to 5, wherein said aerogel product is a silica aerogel slab or a silica aerogel brick.

8. The aerogel article of claim 7, wherein the porous rigid substrate comprises at least one of a foamed cement board, a foamed brick, an aerated brick, a sponge brick, a foamed ceramic board, a water permeable brick, a foamed glass board, a foamed concrete board, or a gypsum board.