阅读说明：本技术 一种气凝胶纤维芯材真空绝热板及其制备方法与应用 (Aerogel fiber core material vacuum insulation panel and preparation method and application thereof ) 是由 张学同 李太岭 刘增伟 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种气凝胶纤维芯材真空绝热板及其制备方法与应用。所述气凝胶纤维芯材真空绝热板包括：芯材,其包括气凝胶纤维、由所述气凝胶纤维形成的纤维制品、由所述气凝胶纤维与粘结剂共混形成的复合纤维制品,以及高阻隔膜,包覆设置于芯材四周并围合形成封闭结构；所述气凝胶纤维芯材真空绝热板的热导率低于10mW/(m·K),密度小于300kg/m～3。本发明的气凝胶纤维芯材的多级孔结构降低了芯材对板内气压敏感性,延长了真空绝热板的使用寿命；另外丰富的孔道结构可以捕获真空绝热板使用过程中产生的少量气体,避免了吸气剂的使用,气凝胶纤维芯材真空绝热板在工业及建筑、绝热、复合材料、能源等领域具有广阔应用前景。(The invention discloses an aerogel fiber core material vacuum insulation panel and a preparation method and application thereof. The aerogel fiber core material vacuum insulation panel comprises: the core material comprises aerogel fibers, a fiber product formed by the aerogel fibers, a composite fiber product formed by blending the aerogel fibers and a binder, and a high-barrier film, wherein the high-barrier film is coated on the periphery of the core material and surrounds the core material to form a closed structure; the thermal conductivity of the aerogel fiber core material vacuum insulation board is lower than 10 mW/(m.K), and the density is less than 300kg/m 3 . The hierarchical pore structure of the aerogel fiber core material reduces the sensitivity of the core material to the air pressure in the plate, and prolongs the service life of the vacuum insulation plate; in addition, abundant pore structure can capture a small amount of gas generated in the use process of the vacuum insulation panel, the use of a getter is avoided, and the aerogel fiber core material vacuum insulation panel has the advantages in the fields of industry, buildings, heat insulation, composite materials, energy sources and the likeHas wide application prospect.)

1. An aerogel fiber core material vacuum insulation panel, characterized by comprising:

the composite fiber product comprises aerogel fibers, a fiber product formed by the aerogel fibers and a composite fiber product formed by blending the aerogel fibers and a binder, wherein the volume ratio of the aerogel fibers in the composite fiber product is 80-99%, and the aerogel fibers, the fiber product or the composite fiber product have a hierarchical pore structure mainly comprising mesopores, micropores and macropores;

the high barrier film is coated on the periphery of the core material and encloses to form a closed structure;

the thermal conductivity of the aerogel fiber core material vacuum insulation board is lower than 10 mW/(m.K), and the density is less than 300kg/m³。

2. The aerogel fiber core vacuum insulation panel according to claim 1, wherein: the aerogel fiber comprises any one or the combination of more than two of polyamide aerogel fiber, silicon oxide aerogel fiber, polyimide aerogel fiber, graphene aerogel fiber and cellulose aerogel fiber; and/or the diameter of the aerogel fiber is 500-0.1 μm, the porosity is 3-99.5%, preferably 20-99.5%, wherein the pore diameter of the pores contained in the aerogel fiber is 4 nm-1 μm, and/or the aerogel fiber comprises short fibers with a selected interface shape, wherein the selected interface shape comprises any one or a combination of more than two of a circle, a hollow, a triangle, a quadrangle, a trefoil, a multilobal shape, a lotus root shape and a cross shape; preferably, the aerogel fibers have an aspect ratio greater than 10: 1.

3. The aerogel fiber core vacuum insulation panel according to claim 1, wherein: the aerogel fibers comprise one or a combination of more than two of hydrophilic aerogel fibers, hydrophobic aerogel fibers and amphiphilic aerogel fibers.

4. The aerogel fiber core vacuum insulation panel according to claim 1, wherein: the form of the fiber product formed by the aerogel fibers comprises any one or the combination of more than two of aerogel fiber flocculus, aerogel fiber felt and aerogel fiber composite felt;

and/or the aerogel fiber also comprises an auxiliary agent which is a reinforcing material, wherein the reinforcing material comprises any one or a combination of more than two of metal oxide, carbon material and nano material; preferably, the reinforcing material comprises any one or a combination of more than two of carbon nano tubes, graphene, Mxene materials, carbon black and white carbon black.

5. The aerogel fiber core vacuum insulation panel according to claim 1, wherein: the form of the binder is liquid or solid, preferably, the volume ratio of the binder in the composite fiber product is 0.1-20%, preferably, the liquid binder comprises a selected macromolecule and/or a selected macromolecule precursor, wherein the selected macromolecule comprises any one or a combination of more than two of polyacrylate, polyurethane and epoxy resin; preferably, the solid adhesive comprises a hot-melt type polymer and/or an inorganic material, and particularly preferably comprises any one or a combination of more than two of polyester fiber, polyethylene, polypropylene, glass fiber and low-melting-point glass powder.

6. The aerogel fiber core vacuum insulation panel according to claim 1, wherein: the high-barrier film comprises any one or the combination of more than two of an aluminum-plastic composite film, an aluminum-plated film and a transparent film.

7. A method of making an aerogel fiber core vacuum insulation panel according to any of claims 1 to 6, comprising:

providing aerogel fibers, a fiber product formed by the aerogel fibers and a composite fiber product formed by the aerogel fibers and a binder as core materials, and drying, wherein the volume ratio of the aerogel fibers in the composite fiber product is 80-99%;

and providing a high-barrier film, coating the core material by adopting the high-barrier film, enclosing to form a closed structure, vacuumizing to a preset vacuum degree, and carrying out heat sealing after pressure maintaining to obtain the aerogel fiber core material vacuum insulation panel.

8. The method of claim 7, wherein: the preset vacuum degree is 0.1-50 mbar.

9. The method of claim 7, wherein: the drying temperature is 100-200 ℃, and the drying time is 30-120 min; and/or maintaining the pressure for 5-60 min; and/or the heat sealing temperature is 140-150 ℃.

10. Use of the aerogel fiber core vacuum insulation panel of any of claims 1-6 in the field of construction, transportation, electrical insulation, cold chain logistics or medical insulation boxes.

Technical Field

The invention relates to a vacuum insulation panel, in particular to a novel aerogel fiber core material vacuum insulation panel and a preparation method and application thereof, and belongs to the field of vacuum insulation panels.

Background

A Vacuum insulation Panel (VIP Panel for short) is a new type of thermal insulation material, and is generally obtained by using a porous material with good thermal insulation performance as a core material, using a high gas barrier composite film as an encapsulation barrier material, and performing Vacuum pumping treatment to extract gas in the system and performing heat sealing. The thermal conductivity of the vacuum insulation panel is generally below 10mW/(m K), and the vacuum insulation panel is a thermal insulation material with the lowest thermal conductivity known at present. Currently, VIP core materials are mainly glass fiber core materials, foam material core materials and fiber/fumed silica powder core materials.

The aerogel is a nano porous amorphous solid material and has the characteristics of low density, large specific surface area and high porosity, and the density variation range is 0.003-0.15 g/cm³The specific surface area can be as high as 1500m²The porosity can reach 99.8 percent, and is one of the solid materials with the lowest known thermal conductivity. The low thermal conductivity of aerogel materials is mainly due to three reasons: 1. the lengthy nanoscale framework inside the aerogel material forms an infinite long path effect, so that solid heat conduction needs to pass through a long path. 2. The pore size of the aerogel is smaller than the molecular free path of air, preventing the heat conduction of gas molecules inside the aerogel. 3. The air inside the aerogel is static, preventing thermal convection of the air inside the aerogel. Aerogels therefore have good insulating properties and are referred to as "super-insulating materials".

The aerogel structure and performance characteristics meet the basic requirements of the core material of the vacuum insulation panel, and the aerogel core material can be theoretically used for processing the vacuum insulation panel. When the aerogel powder is used as a core material of the vacuum insulation panel, the powder is difficult to form due to the flowability of the powder, and the powder is easy to leak in the processing process; the thermal conductivity of the aerogel powder core material formed by using the binder is generally increased, and the binder is easy to generate gas in the using process, so that the vacuum degree in the plate is reduced, and the heat insulation performance of the vacuum heat insulation plate is influenced. The aerogel felt also has the problem of powder leakage when being used as the core material of the vacuum heat insulation board, and due to the existence of the high-density fiber felt body, a certain heat transfer path is provided, so that the advantages of low density and low heat conductivity of the aerogel are lost when the density of an aerogel product is increased.

Therefore, how to solve the problems existing when the prior aerogel product is used as a core material is very important to obtain the high-performance aerogel vacuum insulation panel.

Disclosure of Invention

In order to solve the problems of the aerogel core material vacuum insulation panel, the invention provides a novel aerogel fiber core material vacuum insulation panel, wherein aerogel fibers and products thereof are used as a core material of the vacuum insulation panel, and the novel vacuum insulation panel with low density, low air pressure sensitivity, low thermal conductivity and long service life is processed.

The invention also aims to provide a preparation method and application of the aerogel fiber core material vacuum insulation panel.

In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:

the embodiment of the invention provides an aerogel fiber core material vacuum insulation panel, which comprises:

the composite fiber product comprises aerogel fibers, a fiber product formed by the aerogel fibers and a composite fiber product formed by blending the aerogel fibers and a binder, wherein the volume ratio of the aerogel fibers in the composite fiber product is 80-99%, and the aerogel fibers, the fiber product or the composite fiber product have a hierarchical pore structure mainly comprising mesopores, micropores and macropores;

the high barrier film is coated on the periphery of the core material and encloses to form a closed structure;

the thermal conductivity of the aerogel fiber core material vacuum insulation board is lower than 10 mW/(m.K), and the density is less than 300kg/m³。

In some embodiments, the aerogel fibers include, but are not limited to, polyamide aerogel fibers, silica aerogel fibers, polyimide aerogel fibers, graphene aerogel fibers, cellulose aerogel fibers, and the like, in any one or combination of two or more thereof.

In some embodiments, the aerogel fibers include one or a combination of two or more of hydrophilic aerogel fibers, hydrophobic aerogel fibers, amphiphilic aerogel fibers, and the like, but are not limited thereto.

Further, the form of the fiber product formed by the aerogel fibers includes any one or a combination of two or more of aerogel fiber flakes, aerogel fiber felt, aerogel fiber composite felt, and the like, but is not limited thereto.

The embodiment of the invention also provides a preparation method of the aerogel fiber core material vacuum insulation panel, which comprises the following steps:

providing aerogel fibers, a fiber product formed by the aerogel fibers and a composite fiber product formed by the aerogel fibers and a binder as core materials, and drying, wherein the volume ratio of the aerogel fibers in the composite fiber product is 80-99%;

and providing a high-barrier film, coating the core material by adopting the high-barrier film, enclosing to form a closed structure, vacuumizing to a preset vacuum degree, and carrying out heat sealing after pressure maintaining to obtain the aerogel fiber core material vacuum insulation panel.

The embodiment of the invention also provides application of the aerogel fiber core material vacuum insulation panel in the fields of buildings, transportation, electric appliance heat insulation, cold chain logistics, medical insulation boxes and the like.

Compared with the prior art, the invention has the advantages that:

1) the aerogel fiber core material provided by the invention can be formed, and can also be processed into an aerogel fiber felt, an aerogel fiber flocculus or a felt made by blending with a binder and other common fibers, so that the advantages of low density and low thermal conductivity of the aerogel are kept, and the density of the whole vacuum insulation panel is reduced;

2) compared with the traditional solid fiber, the single aerogel fiber provided by the invention has a more redundant heat transfer path due to the rich pore structure, so that the overall heat conductivity of the vacuum insulation panel is obviously reduced;

3) compared with the common fiber felt, the aerogel fiber felt body provided by the invention has a hierarchical pore structure, and the sensitivity of the core material to the internal air pressure of the board is reduced due to the existence of mesopores; the abundant pore structure can capture a small amount of gas generated in the use process of the vacuum insulation panel, the use of a getter is avoided, a certain heat insulation capability can be maintained by depending on the heat insulation performance of the aerogel material body after the outer layer barrier film is damaged, and the service life of the vacuum insulation panel is prolonged;

4) the aerogel fiber core material vacuum insulation panel has wide application prospect in the fields of industry, buildings, heat insulation, composite materials, energy sources and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a digital photograph of aerogel fibers in example 1 of the present invention;

FIG. 2 is a digital photograph of an aerogel fiber batting according to example 5 of the present invention;

FIG. 3 is a scanning electron micrograph of a batt of aerogel fibers according to example 5 of the present invention;

FIG. 4 is a digital photograph of a composite core of aerogel fiber batts and glass fibers according to example 6 of the present invention;

fig. 5 is a digital photograph of the aerogel fiber core vacuum insulation panel obtained in example 6 of the present invention.

Detailed Description

In view of the defects in the prior art, the inventor of the present invention has made extensive research and practice to provide a technical scheme of the present invention, which mainly provides a vacuum insulation panel with aerogel fiber core material, wherein aerogel fibers and products thereof are used as core materials, and a high barrier film with excellent barrier property is coated on the outer layer to form a closed structure. The thermal conductivity of the aerogel fiber core material vacuum insulation board is lower than 10 mW/(m.K), and the density is smallAt 300kg/m³. The technical solution, its implementation and principles, etc. will be further explained as follows.

An aspect of an embodiment of the present invention provides an aerogel fiber core vacuum insulation panel, which includes:

the composite fiber product comprises aerogel fibers, a fiber product formed by the aerogel fibers and a composite fiber product formed by blending the aerogel fibers and a binder, wherein the volume ratio of the aerogel fibers in the composite fiber product is 80-99%, and the aerogel fibers, the fiber product or the composite fiber product have a hierarchical pore structure mainly comprising mesopores, micropores and macropores;

the high barrier film is coated on the periphery of the core material and encloses to form a closed structure;

the thermal conductivity of the aerogel fiber core material vacuum insulation board is lower than 10 mW/(m.K), and the density is less than 300kg/m³。

Furthermore, the aerogel fiber core material vacuum insulation panel takes aerogel fibers and products thereof as the core material of the vacuum insulation panel, and the outer layer of the vacuum insulation panel is coated with a high-barrier membrane with excellent barrier property to form a closed structure.

In some embodiments, a specific structure of the aerogel fiber core vacuum insulation panel comprises an aerogel fiber core comprising aerogel fibers, an aerogel fiber blanket, an aerogel fiber batt, or a binder composite; the high-barrier film is coated on the periphery of the aerogel fiber core material to form a closed vacuum structure. Placing the aerogel fiber core material in a barrier bag, vacuumizing until the vacuum degree in the board is 0.1-50 mbar, and performing heat sealing and edge folding to obtain the aerogel fiber core material vacuum insulation board.

In some embodiments, the aerogel fibers include, but are not limited to, polyamide aerogel fibers, silica aerogel fibers, polyimide aerogel fibers, graphene aerogel fibers, cellulose aerogel fibers, and the like, in any one or combination of two or more thereof.

Further, the diameter of the aerogel fiber is 500-0.1 μm, the porosity is 3-99.5%, preferably 20-99.5%, and the pore diameter of the pores contained in the aerogel fiber is 4 nm-1 μm.

In some embodiments, the aerogel fibers comprise short fibers having a selected interface shape, wherein the selected interface shape includes, but is not limited to, round, hollow, triangular, tetragonal, trilobal, multilobal, lotus root, cross-shaped, and other geometrically designed fibers.

Further, the aerogel fibers have an aspect ratio greater than 10: 1.

In some embodiments, the aerogel fibers include one or a combination of two or more of hydrophilic aerogel fibers, hydrophobic aerogel fibers, amphiphilic aerogel fibers, and the like, but are not limited thereto.

In some embodiments, the form of the fiber product formed by the aerogel fibers includes any one or a combination of two or more of aerogel fiber batting, aerogel fiber mat, aerogel fiber composite mat, and the like, but is not limited thereto.

Further, the aerogel fiber comprises single-component aerogel fiber, flocculus, fiber felt or fiber products obtained by blending with a binder and other fibers.

The aerogel fiber core material provided by the invention can be molded, and can also be processed into an aerogel fiber felt, an aerogel fiber flocculus or a binder, or is blended with other common fibers for making a felt, so that the advantages of low density and low thermal conductivity of the aerogel are kept, the density of the material is greatly reduced, and the weight is reduced; in addition, the existence of the mesopores with the hierarchical pore structure reduces the sensitivity of the core material to the air pressure in the plate and prolongs the service life of the vacuum insulation plate; in addition, the abundant pore structure has a more lengthy heat transfer path, a small amount of gas generated in the use process of the vacuum insulation panel can be captured, and the use of a getter is avoided.

In some embodiments, certain reinforcing additives can be further added to the aerogel fibers to improve the mechanical strength of the filling material and provide functional modification, and the auxiliary components are mainly reinforcing materials.

In some embodiments, the reinforcing material includes any one or a combination of two or more of metal oxides, carbon materials, nanomaterials, and the like, but is not limited thereto.

Further, the reinforcing material includes any one or a combination of two or more of carbon nanotubes, graphene, Mxene material, carbon black, white carbon black, and the like, but is not limited thereto.

In some embodiments, the other fibers may include any one or a combination of two or more of glass fiber mats, glass fiber cotton, basalt fiber, rock wool fiber, boron fiber, ceramic fiber, microfiber, and the like, but are not limited thereto.

Further, the aerogel fiber composite mat is a composite fiber product obtained by combining aerogel fibers and any one or more than two of a glass fiber mat, glass fiber cotton, basalt fibers, rock wool fibers, boron fibers, ceramic fibers, superfine fibers and the like.

In some embodiments, the form of the binder is liquid or solid, and the volume ratio of the binder in the composite fiber product is 0.1-20%.

Further, the liquid binder includes a solution of a selected polymer and/or a precursor of a selected polymer, wherein the selected polymer may include, for example, one or a combination of two or more of polyacrylate, polyurethane, epoxy resin, and the like, but is not limited thereto.

Further, the solid adhesive includes a hot-melt type polymer and/or other inorganic materials, and may preferably include, for example, any one or a combination of two or more of polyester fiber, polyethylene, polypropylene, glass fiber, low-melting glass frit, and the like, but is not limited thereto.

Furthermore, the form of the binder used in the aerogel fiber core material is liquid or solid, the liquid binder is a solution or a polymer precursor (such as polyacrylate solution, polyurethane solution, epoxy resin, etc.) of a certain polymer, and the solid binder is a hot-melt polymer (such as polyester fiber, polyethylene, polypropylene, etc.).

In some embodiments, the high barrier film includes any one or a combination of two or more of an aluminum-plastic composite film, an aluminum-plated film, a transparent film, and the like, but is not limited thereto.

In another aspect of the embodiments of the present invention, there is also provided a method for preparing an aerogel fiber core vacuum insulation panel, including:

providing aerogel fibers, a fiber product formed by the aerogel fibers and a composite fiber product formed by the aerogel fibers and a binder as core materials, and drying, wherein the volume ratio of the aerogel fibers in the composite fiber product is 80-99%;

and providing a high-barrier film, coating the core material by adopting the high-barrier film, enclosing to form a closed structure, vacuumizing to a preset vacuum degree, and carrying out heat sealing after pressure maintaining to obtain the aerogel fiber core material vacuum insulation panel.

In some more specific embodiments, the method for preparing the aerogel fiber core vacuum insulation panel specifically comprises the following steps:

(1) the core material takes aerogel fibers as main materials, the aerogel fibers are arranged into corresponding shapes according to use requirements, and the corresponding shapes are placed into a high-temperature drying box for drying;

(2) putting the aerogel core material obtained in the step (1) into a barrier bag made of a dried high-barrier film, and then putting the barrier bag into a vacuum packaging machine;

(3) and vacuumizing the vacuum cavity by the vacuum packaging machine until the vacuum cavity reaches high vacuum degree, maintaining the pressure for a period of time, performing heat sealing, taking out the sample plate after the equipment is deflated, and performing edge folding treatment to obtain the aerogel fiber core material vacuum insulation plate.

In some embodiments, in step (1), the aerogel fibers include any one or a combination of two or more of polyamide aerogel fibers, silica aerogel fibers, polyimide aerogel fibers, graphene aerogel fibers, cellulose aerogel fibers, and the like, but are not limited thereto.

In some embodiments, in step (1), the aerogel fibers include one or a combination of two or more of hydrophilic aerogel fibers, hydrophobic aerogel fibers, amphiphilic aerogel fibers, and the like, but are not limited thereto.

In some embodiments, in step (1), the form of the fiber product formed by the aerogel fibers includes any one or a combination of two or more of aerogel fiber flakes, aerogel fiber felt, aerogel fiber composite felt, and the like, but is not limited thereto.

Further, the aerogel fiber comprises single-component aerogel fiber, flocculus, fiber felt or fiber products obtained by blending with other fibers.

Further, the aerogel fiber composite mat is a composite fiber product obtained by combining aerogel fibers and any one or more than two of a glass fiber mat, glass fiber cotton, basalt fibers, rock wool fibers, boron fibers, ceramic fibers, superfine fibers and the like.

Furthermore, the form of the binder used in the aerogel fiber core material is liquid or solid, the liquid binder is a solution or a polymer precursor (such as polyacrylate solution, polyurethane solution, epoxy resin, etc.) of a certain polymer, and the solid binder is a hot-melt polymer (such as polyester fiber, polyethylene, polypropylene, etc.).

In addition, in the present invention, a method of uniformly mixing aerogel fibers with a binder includes: the aerogel fiber is prepared into a certain three-dimensional shape and naturally accumulated to form a flocculus with a stable three-dimensional structure by taking the aerogel fiber as a main body and main raw materials, or a certain amount of binder is added for thermal shaping, so that the aerogel fiber is mutually adhered and overlapped to form a composite fiber product with a three-dimensional structure.

In some embodiments, the method of making comprises: and fully and uniformly mixing the aerogel fibers with the binder by at least any one of spraying, coating, mechanical mixing and the like. That is, stated another way, the binder and aerogel fibers can be mixed in a variety of ways, including but not limited to: spraying, coating, mechanical mixing, and the like.

Further, the method of mixing includes: a solution comprising a binder is sprayed onto at least a portion of the surface of the aerogel fibers.

Further, the method of mixing includes: a solution comprising a binder is applied to at least a portion of the surface of the aerogel fibers.

Further, the method of mixing includes: mechanically mixing the aerogel fibers with a solid binder.

In some more specific embodiments, the method specifically comprises the following steps: the aerogel fibers and the binder can be mixed by spraying a binder solution onto the aerogel fibers, coating a part of the surface of the aerogel fibers with the binder solution, and mechanically mixing the aerogel fibers and the solid binder (fibrous or powdery).

In some more specific embodiments, the method of preparing the aerogel fibers comprises: the preparation method comprises the steps of preparing solvent-containing fibers by adopting a spinning process, and then drying the solvent-containing fibers by adopting at least any one of supercritical drying, freeze drying, vacuum drying, normal-pressure drying and the like, so as to obtain the aerogel fibers.

Further, the spinning process adopted in the method can be a wet spinning process or a dry-jet wet spinning process, and the main step is to form the formed fiber in a coagulating bath by using a high molecular solution or sol as a spinning solution in an extruding mode.

In some more specific embodiments, the aerogel fiber material can be added with certain additives to improve the mechanical strength of the filling material, and the additives are mainly reinforcing materials.

In some embodiments, the reinforcing material includes any one or a combination of two or more of metal oxides, carbon materials, nanomaterials, and the like, but is not limited thereto.

Further, the reinforcing material includes any one or a combination of two or more of carbon nanotubes, graphene, Mxene material, carbon black, white carbon black, and the like, but is not limited thereto.

Further, in the step (1), the drying temperature is 100-200 ℃ and the drying time is 30-120 min.

In some embodiments, in step (2), the high barrier film comprises one or two of an aluminum-plastic composite film, an aluminum-plated film and a transparent film.

In some embodiments, in step (3), the vacuum chamber is preset to have a vacuum degree of 0.1-50 mbar.

Further, the pressure maintaining time is 5-60 min.

Further, the heat sealing temperature is 140-150 ℃.

The invention also provides application of the aerogel fiber core material vacuum insulation panel in the fields of buildings, transportation, electric appliance heat insulation, cold chain logistics, medical insulation boxes and the like.

Furthermore, the aerogel fiber core material vacuum insulation panel has wide application prospects in the fields of industry, buildings, heat insulation, composite materials, energy sources and the like.

In conclusion, by the technical scheme, the hierarchical pore structure of the aerogel fiber core material reduces the sensitivity of the core material to the air pressure in the plate, and prolongs the service life of the vacuum insulation plate; in addition, abundant pore structure can capture a small amount of gas generated in the use process of the vacuum insulation panel, the use of a getter is avoided, and the aerogel fiber core material vacuum insulation panel has wide application prospect in the fields of industry, buildings, heat insulation, composite materials, energy sources and the like.

The technical solutions of the present invention will be described in further detail below with reference to several preferred embodiments and accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. It should be noted that the following examples are intended to facilitate the understanding of the present invention, and do not limit the present invention in any way, and those skilled in the art may make modifications according to the actual circumstances. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. The experimental materials used in the examples used below were all available from conventional biochemical reagents companies, unless otherwise specified.

Example 1

The preparation method of the novel aerogel fiber core material vacuum insulation panel in the embodiment comprises the following steps:

(1) selecting polyamide aerogel fibers with the porosity of 98% and the circular cross-section shape as core materials, finishing and flattening the aerogel fibers, and drying in a high-temperature drying oven at 100 ℃ for 30 min; figure 1 shows a digital photograph of aerogel fibers in this example.

(2) Putting the aerogel core material obtained in the step (1) into a barrier bag made of a dried aluminized barrier film, and then putting the barrier bag into a vacuum packaging machine;

(3) and (3) vacuumizing the vacuum packaging machine until the vacuum degree in the vacuum cavity is 0.1mbar, maintaining the pressure for 30min, then performing heat sealing, taking out the sample plate after the equipment is deflated, and performing edge folding treatment to obtain the aerogel fiber core material vacuum insulation plate. The thermal conductivity, density and other performance parameters of the aerogel fiber core material vacuum insulation panel are provided in table 1.

Example 2

The preparation method of the novel aerogel fiber core material vacuum insulation panel in the embodiment comprises the following steps:

(1) selecting silica aerogel fiber with porosity of 88% and triangular cross section as core material, polyester fiber as binder, finishing the aerogel fiber and the polyester fiber to be flat, and drying in a high temperature drying oven at 130 deg.C for 30 min.

(2) Putting the aerogel core material obtained in the step (1) into a barrier bag made of a dried aluminum-plastic composite film, and then putting the barrier bag into a vacuum packaging machine;

(3) and (3) vacuumizing the vacuum packaging machine until the vacuum degree in the vacuum cavity is 10mbar, maintaining the pressure for 30min, then carrying out heat sealing, taking out the sample plate after the equipment is deflated, and carrying out edge folding treatment to obtain the aerogel fiber core material vacuum insulation plate. The thermal conductivity, density and other performance parameters of the aerogel fiber core material vacuum insulation panel are provided in table 1.

Example 3

The preparation method of the novel aerogel fiber core material vacuum insulation panel in the embodiment comprises the following steps:

(1) selecting graphene aerogel fibers with the porosity of 98% and the cross-sectional shape of a trefoil as a core material, using epoxy resin as a binder, finishing the aerogel fibers to be flat, spraying the epoxy resin on the surface, and then putting the aerogel fibers into a high-temperature drying oven at 100 ℃ for drying for 30 min;

(2) putting the aerogel core material obtained in the step (1) into a barrier bag made of a dried aluminized barrier film, and then putting the barrier bag into a vacuum packaging machine;

(3) and (3) vacuumizing the vacuum packaging machine until the vacuum degree in the vacuum cavity is 40mbar, maintaining the pressure for 30min, then carrying out heat sealing, taking out the sample plate after the equipment is deflated, and carrying out edge folding treatment to obtain the aerogel fiber core material vacuum insulation plate. The thermal conductivity, density and other performance parameters of the aerogel fiber core material vacuum insulation panel are provided in table 1.

Example 4

The preparation method of the novel aerogel fiber core material vacuum insulation panel in the embodiment comprises the following steps:

(1) selecting graphene reinforced polyimide aerogel fibers with the porosity of 95% and irregular multi-leaf cross section as core materials, using polyethylene fibers as binders, mixing the aerogel fibers with the polyethylene fibers, finishing and flattening, and drying in a high-temperature drying oven at 170 ℃ for 30 min;

(2) putting the aerogel core material obtained in the step (1) into a barrier bag made of a dried aluminized barrier film, and then putting the barrier bag into a vacuum packaging machine;

(3) and vacuumizing the vacuum packaging machine until the vacuum degree in the vacuum cavity is 50mbar, maintaining the pressure for 5min, then performing heat sealing, taking out the sample plate after the equipment is deflated, and performing edge folding treatment to obtain the aerogel fiber core material vacuum insulation plate. The thermal conductivity, density and other performance parameters of the aerogel fiber core material vacuum insulation panel are provided in table 1.

Example 5

The preparation method of the novel aerogel fiber core material vacuum insulation panel in the embodiment comprises the following steps:

(1) selecting cellulose aerogel fiber with the porosity of 91% and the circular cross-section shape as a core material, using low-melting-point glass powder as a binder, processing the aerogel fiber into aerogel fiber flocculus, and drying in a high-temperature drying oven at 180 ℃ for 30 min; FIG. 2 shows a digital photograph of the aerogel fiber batting of this example, which is a SEM photograph of the aerogel fiber batting shown in FIG. 3.

(2) Putting the aerogel core material obtained in the step (1) into a barrier bag made of a dried aluminized barrier film, and then putting the barrier bag into a vacuum packaging machine;

(3) and (3) vacuumizing the vacuum packaging machine until the vacuum degree in the vacuum cavity is 0.1mbar, maintaining the pressure for 30min, then performing heat sealing, taking out the sample plate after the equipment is deflated, and performing edge folding treatment to obtain the aerogel fiber core material vacuum insulation plate. The thermal conductivity, density and other performance parameters of the aerogel fiber core material vacuum insulation panel are provided in table 1.

Example 6

The preparation method of the novel aerogel fiber core material vacuum insulation panel in the embodiment comprises the following steps:

(1) selecting Mxene reinforced polyamide aerogel fiber with porosity of 88% and porous lotus-root-shaped cross section as a core material, arranging the aerogel fiber in order, pressing and processing the aerogel fiber into an aerogel fiber felt, mixing a certain amount of glass fiber with the aerogel fiber flocculus, and drying the mixture in a high-temperature drying oven at 200 ℃ for 30 min; a digital photograph of the aerogel fiber batting and glass fiber composite core in this example can be seen in FIG. 4.

(2) Putting the aerogel core material obtained in the step (1) into a barrier bag made of a dried aluminized barrier film, and then putting the barrier bag into a vacuum packaging machine;

(3) and (3) vacuumizing the vacuum packaging machine until the vacuum degree in the vacuum cavity is 0.1mbar, maintaining the pressure for 30min, then carrying out heat sealing, taking out the sample plate after the equipment is deflated, and carrying out edge folding treatment to obtain the aerogel fiber core material vacuum insulation plate, wherein a digital photo graph of the aerogel fiber core material vacuum insulation plate can be shown in figure 5. The thermal conductivity, density and other performance parameters of the aerogel fiber core material vacuum insulation panel are provided in table 1.

Example 7

The preparation method of the novel aerogel fiber core material vacuum insulation panel in the embodiment comprises the following steps:

(1) selecting carbon nano tube reinforced polyamide aerogel fibers with the porosity of 78% and cross-shaped cross-section as core materials, mixing and pressing the aerogel fibers and polyethylene fibers to form an aerogel fiber composite felt, and putting the aerogel fiber composite felt into a high-temperature drying oven at 140 ℃ to dry for 120 min;

(2) putting the aerogel core material obtained in the step (1) into a barrier bag made of a dried transparent film, and then putting the barrier bag into a vacuum packaging machine;

(3) and (3) vacuumizing the vacuum packaging machine until the vacuum degree in the vacuum cavity is 10mbar, maintaining the pressure for 60min, then carrying out heat sealing, taking out the sample plate after the equipment is deflated, and carrying out edge folding treatment to obtain the aerogel fiber core material vacuum insulation plate. The thermal conductivity, density and other performance parameters of the aerogel fiber core material vacuum insulation panel are provided in table 1.

Comparative example 1

(1) Selecting silica aerogel powder as a core material and polyester fiber as a binder, uniformly mixing the aerogel powder and the polyester fiber, finishing and flattening, and drying in a high-temperature drying oven at 130 ℃ for 30 min;

(2) putting the aerogel core material obtained in the step (1) into a barrier bag made of a dried aluminum-plastic composite film, and then putting the barrier bag into a vacuum packaging machine;

(3) and (3) vacuumizing the vacuum packaging machine until the vacuum degree in the vacuum cavity is 0.1mba r, maintaining the pressure for 30min, then performing heat sealing, taking out the sample plate after the equipment is deflated, and performing edge folding treatment to obtain the aerogel fiber core material vacuum insulation plate. The performance parameters of the aerogel powder core material vacuum insulation panel, such as thermal conductivity, density and the like, are provided in table 1.

Comparative example 2

(1) Selecting glass fiber cotton as a core material, finishing and flattening the glass fiber cotton, and then putting the glass fiber cotton into a high-temperature drying oven at 130 ℃ for drying for 30 min;

(2) putting the core material obtained in the step (1) into a barrier bag made of a dried aluminum-plastic composite film, and then putting the barrier bag into a vacuum packaging machine;

(3) and (3) vacuumizing the vacuum cavity by using a vacuum packaging machine until the vacuum degree in the vacuum cavity is 0.1mba r, maintaining the pressure for 30min, then carrying out heat sealing, taking out the sample plate after the equipment is deflated, and carrying out edge folding treatment to obtain the vacuum insulation panel. Table 1 provides the thermal conductivity, density, etc. performance parameters of the vacuum insulation panel.

TABLE 1 thermal conductivity, Density of vacuum insulation panels of examples 1-7, comparative examples 1-2

In addition, the inventor also refers to the mode of example 1-example 7, and experiments are carried out by using other raw materials and conditions listed in the specification, and tests show that the aerogel fiber core material vacuum insulation panels also have the excellent performances mentioned in the specification.

The aspects, embodiments, features and examples of the present invention should be considered as illustrative in all respects and not intended to be limiting of the invention, the scope of which is defined only by the claims. Other embodiments, modifications, and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.

The use of headings and chapters in this disclosure is not meant to limit the disclosure; each section may apply to any aspect, embodiment, or feature of the disclosure.

Throughout this specification, where a composition is described as having, containing, or comprising specific components or where a process is described as having, containing, or comprising specific process steps, it is contemplated that the composition of the present teachings also consist essentially of, or consist of, the recited components, and the process of the present teachings also consist essentially of, or consist of, the recited process steps.

It should be understood that the order of steps or the order in which particular actions are performed is not critical, so long as the teachings of the invention remain operable. Further, two or more steps or actions may be performed simultaneously.

While the invention has been described with reference to illustrative embodiments, it will be understood by those skilled in the art that various other changes, omissions and/or additions may be made and substantial equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.