Preparation method of hydrophobic aerogel thermal insulation felt material

Abstract

The invention provides a preparation method of a hydrophobic aerogel thermal insulation felt material, which comprises the following steps: adding 10-50 parts by weight of silicon dioxide aerogel powder and 50-90 parts by weight of porous or high-surface-area powder into a stirrer for high-speed mixing to obtain composite powder; aluminum-magnesium fibers are arranged into thin felts with the thickness of 0.1-1 mm, the composite powder is evenly sprayed on the thin felts through a spray head, then the thin felts with the powder are laid layer by layer, and fiber felts are obtained through pressing; the fiber felt is soaked in the hydrophobic emulsion to make full contact with the hydrophobic emulsion, the soaking time is 24-48 h, the soaked fiber felt is dried, the drying temperature is 55-65 DEG C, and the hydrophobic aerogel heat preservation felt is obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal insulation materials, and particularly relates to a preparation method of a hydrophobic aerogel thermal insulation felt material. Background Art

[0002] Due to its three-dimensional network structure, silica aerogel is filled with small pores inside, which blocks the path of heat conduction. It is currently the solid material with the lowest thermal conductivity and also the thermal insulation material with the best comprehensive performance at present. However, due to the poor mechanical strength of silica aerogel, its further popularization and application are hindered. Currently, preparing silica aerogel thermal insulation felt by compounding fibers with silica aerogel is an effective way to further expand the application of silica aerogel. However, porous materials are prone to water absorption, and the moisture content has a significant impact on the thermal insulation effect, which will seriously reduce the thermal insulation effect of the material. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a preparation method of a hydrophobic aerogel thermal insulation felt material, which can effectively improve the hydrophobicity of the aerogel thermal insulation felt.

[0004] In order to achieve the purpose of the present invention, the technical scheme adopted by the present invention is as follows:

[0005] A preparation method of a hydrophobic aerogel thermal insulation felt material includes the following steps:

[0006] A. Add 10 - 50 parts by weight of silica aerogel powder and 50 - 90 parts by weight of porous or high-surface-area powder into a blender and mix at high speed to obtain a composite powder;

[0007] B. Arrange aluminosilicate fibers into a thin felt with a thickness of 0.1 - 1 mm, evenly spray the composite powder on the thin felt through a nozzle, then layer by layer stack the thin felt with the powder sprinkled on it, and press to obtain a fiber felt;

[0008] C. Immerse the fiber felt into a hydrophobic emulsion to make it fully contact, the immersion time is 24 - 48 hours, and dry the immersed fiber felt, the drying temperature is 55 - 65 °C, to obtain a hydrophobic aerogel thermal insulation felt.

[0009] The porous or high-surface-area powder described in the present invention is one or more of expanded perlite powder, expanded vermiculite powder, 4A zeolite powder, porous diatomite, and ultrafine talc powder.

[0010] Mix the silica aerogel powder with the porous material or high-surface-area powder at high speed in a high-speed blender. The powders collide and rub against each other, and the powders break to generate new interfaces and broken chemical bonds. The broken chemical bonds have extremely high reactivity and recombine with each other to form new aggregates.

[0011] The aerogel powder in the composite powder is firmly adsorbed on the surface of the porous or high-surface powder, forming a complete aerogel coating on its surface, making the interfacial properties of the whole powder show the characteristics of aerogel. When plugging the fiber pores, it shows the characteristics of aerogel powder, and the obtained composite material has the same heat insulation performance as that completely using aerogel powder.

[0012] The weight ratio of the silica aerogel powder described in the present invention in the composite powder is more than 25%.

[0013] In step A of the present invention, the stirring speed is 400 - 1000 rpm, the stirring temperature is 80 - 120 °C, stirring is carried out for 10 - 15 min, and after cooling, a composite powder is obtained.

[0014] Under high-speed stirring at 400 - 1000 rpm, the aerogel powder is fully mixed and collided with other high-surface or porous powders to generate new interfaces. The aerogel powder is firmly adsorbed on the surface of the porous or high-surface powder, forming a complete aerogel coating on its surface. Controlling the temperature at 80 - 120 °C can allow low-molecular volatile substances such as moisture in the powder to volatilize during stirring. The performance of the composite powder obtained by generating new interfaces through collision is more stable. Exceeding 15 min will cause the material temperature to be too high, resulting in unstable material performance.

[0015] The preparation method of the hydrophobic emulsion described in the present invention includes the following steps:

[0016] C1. Under a nitrogen atmosphere, add polymerization monomers, cationic surfactants and deionized water into a container for pre-emulsification reaction; then slowly dropwise add an initiator and continue the reaction to obtain emulsion A;

[0017] C2. Under a nitrogen atmosphere, add polymerization monomers, cationic surfactants and deionized water into a container for pre-emulsification reaction to obtain emulsion B;

[0018] C3. Slowly dropwise add emulsion B and the initiator together into emulsion A and react to obtain a cationic emulsion.

[0019] C4. Mix the cationic emulsion with an ethanol-water solvent, stir evenly, add sepiolite powder, stir evenly, and let it stand for 20 - 24 h, then add epoxy resin powder, stir evenly to obtain a hydrophobic emulsion.

[0020] Sepiolite is a phyllosilicate mineral with a layer-chain structure. In its structure, two layers of silicon-oxygen tetrahedrons sandwich a layer of magnesium-oxygen octahedrons to form a layered structure. Sepiolite contains zeolite pores and voids that penetrate the entire structure, so it has strong adsorption capacity. In this invention, a cationic emulsion is first used to carry out ion-exchange modification with sepiolite, adsorbing organic cations to replace the magnesium ions at the edge of the octahedral structure. At the same time, the hydrophobic alkyl chains wrap sepiolite, preventing water molecules from entering the interior of sepiolite, turning the hydrophilic clay surface into a lipophilic one, improving the dispersibility of sepiolite in the organic phase, strengthening the interfacial adhesion between sepiolite and the thermal insulation material, and enhancing the physical and mechanical properties of the material. After sepiolite is dispersed in the emulsion and fully soaked and modified for 20 - 24 h, it is added to epoxy resin. The compatibility between the modified sepiolite and the epoxy resin matrix increases, and a superhydrophobic layer is prepared.

[0021] Preferably, in the C1 step and the C2 step, the solid-liquid mass ratio of the reaction raw materials is 1:5, and among them, the cationic surfactant accounts for 20% of the mass of the solid raw materials.

[0022] Preferably, the polymerization monomers in the C1 step are styrene, allyl hexanoate, and dimethyldodecylallylammonium chloride, and the mass ratio is 5:5:1; the polymerization monomers in the C2 step are butyl acrylate, butyl methacrylate, and dodecyl acrylate, and the mass ratio is 5:4:2.

[0023] Preferably, in the C4 step, the mass ratio of the raw materials is: 25 - 35 parts of cationic emulsion, 50 parts of epoxy resin, 8 - 10 parts of sepiolite, 80 - 120 parts of ethanol, and 300 - 500 parts of deionized water.

[0024] Further preferably, the volume ratio of ethanol to deionized water is 1:4, and the stability of the latex particles is the best.

[0025] Preferably, the cationic surfactant is cetyltrimethylammonium chloride, and the initiator is azodiisobutylamidine hydrochloride.

[0026] Preferably, the reaction conditions for pre-emulsification are: at room temperature, the rotation speed is 600 - 1000 rpm / min, and pre-emulsification is carried out for 30 min; the initiator is slowly added dropwise to the emulsion at 80 - 90 °C, and the reaction is kept warm for 2 - 3 h.

[0027] Preferably, the particle size of the sepiolite powder is 200 mesh.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. The present invention relates to a nano thermal insulation material composed of aluminous magnesian fiber, aerogel and other powders. Two powders are mixed by a conventional high-speed mixer, so that the powders collide and rub against each other and recombine to form a new combination. The amount of aerogel powder material obtained by the supercritical drying method is significantly reduced, the cost is low, and the same thermal insulation effect can be achieved at the same time.

[0030] 2. The process of the present invention is different from the traditional sol-gel method. Without liquid solvents, the aerogel composite powder is sprayed into the fiber felt through a nozzle, and the powder adheres to the fiber felt under the action of force, thereby preventing air from flowing in the fiber gaps and avoiding heat transfer caused by air convection. The obtained composite material is a nano microporous composite material with low thermal conductivity. Moreover, the process does not use solvents and supercritical processes, and can be realized by conventional equipment, with low equipment cost and easy to popularize and apply.

[0031] 3. For the hydrophobic emulsion of the present invention, styrene and allyl hexanoate are selected as hard monomers, butyl acrylate, butyl methacrylate and dodecyl acrylate are selected as soft monomers. By strictly controlling the monomer ratio, the stability and dispersibility of the emulsion polymer can be effectively controlled; dimethyldodecylallylammonium chloride and cetyltrimethylammonium chloride are used as cationic monomers, which participate in the polymerization and introduce positive charges on the polymer chain segments, which is beneficial to be adsorbed by sepiolite and tightly wrapped; the initiator is a water-soluble azo initiator, and the decomposed free radicals carry positive charges, which are the same as the electric charges of the emulsion particles. After polymerization on the surface of the emulsion particles, it is beneficial to improve the stability of the composite cationic emulsion and form hydrophobic cationic emulsion particles with positive charges on the surface.

[0032] 4. Under the action of cationic monomers and initiators, a cationic emulsion with a core-shell structure is successfully synthesized by a two-step semi-continuous polymerization method, which has good thermal stability. The sepiolite modified by the latex particles has good compatibility and hydrophobicity with the epoxy resin matrix. Specific Embodiments

[0033] In order to more clearly and detailedly illustrate the technical solutions of the present invention, the present invention will be further described through relevant embodiments below. The following embodiments are only for specifically illustrating the implementation methods of the present invention and do not limit the protection scope of the present invention.

[0034] Example 1

[0035] A preparation method of a hydrophobic aerogel thermal insulation felt material includes the following steps:

[0036] A. Add 30 parts by weight of silica aerogel powder and 80 parts by weight of expanded perlite powder into a mixer and mix at high speed to obtain a composite powder;

[0037] B. Arrange aluminosilicate fibers into a thin felt with a thickness of 0.1 - 1 mm, evenly sprinkle the composite powder on the thin felt through a nozzle, then stack the thin felt with the powder layer by layer, and press to obtain a fiber felt;

[0038] C. Immerse the fiber felt in the hydrophobic emulsion to fully contact with it for 24 - 48 hours, and then dry the immersed fiber felt at a drying temperature of 55 - 65 °C to obtain a modified hydrophobic fiber felt material.

[0039] Example 2

[0040] The preparation method of the hydrophobic emulsion of the present invention includes the following steps:

[0041] C1. Under a nitrogen atmosphere, add polymerization monomers, cationic surfactants, and deionized water into a container for pre - emulsification reaction; then slowly dropwise add an initiator and continue the reaction to obtain emulsion A;

[0042] C2. Under a nitrogen atmosphere, add polymerization monomers, cationic surfactants, and deionized water into a container for pre - emulsification reaction to obtain emulsion B;

[0043] C3. Slowly dropwise add emulsion B and the initiator together into emulsion A, and react to obtain a cationic emulsion.

[0044] C4. Mix the cationic emulsion with an ethanol - water solvent, stir evenly, add sepiolite powder, stir evenly, and let it stand for 20 - 24 h, then add epoxy resin powder, stir evenly to obtain a hydrophobic emulsion.

[0045] According to the above method, a variety of polymerization monomers were experimented to obtain a series of hydrophobic emulsions, and the specific monomer combinations are shown in Table 1.

[0046] Table 1 Different monomer combinations

[0047]

[0048] Pre - emulsification reaction was carried out with the above different monomer combinations and the cationic surfactant cetyltrimethylammonium chloride, and 2,2'-azobis(2 - methylpropionamidine) dihydrochloride was used as the initiator to obtain 6 groups of cationic emulsions. Each group of cationic emulsions was used to prepare a hydrophobic emulsion: mix the cationic emulsion with an ethanol - water solvent, stir evenly, let it stand for 20 h, then add epoxy resin powder, stir evenly to obtain a hydrophobic emulsion.

[0049] Apply this batch of hydrophobic emulsions to the aerogel fiber felts of Example 1 respectively. Immerse the fiber felts into the hydrophobic emulsions to make them in full contact. The immersion time is 24 hours. Transfer the modified fiber felts to an oven, and the drying temperature is 65°C to obtain modified fiber felt hydrophobic materials. Conduct hydrophobic effect tests on the modified fiber felts: Weigh the materials as W1, place them in a constant temperature and humidity chamber, and the set conditions of the constant temperature and humidity chamber are: temperature 50°C, humidity 95%, time 96 hours, take them out and weigh as W2. Comparative Example 1 is the fiber felt material without immersion treatment, and Comparative Example 2 is the commercially available aerogel fiber felt material.

[0050] Mass moisture absorption rate = (W2 - W1) / W1.

[0051] Table 2 Test results of aerogel fiber felts

[0052]

[0053]

[0054] As can be seen from Table 2, the emulsion prepared from the monomers in Group 3 has the lowest moisture absorption rate, and after adding sepiolite powder, the water absorption rate is significantly improved.

[0055] Example 3

[0056] A preparation method of a hydrophobic aerogel thermal insulation felt material includes the following steps:

[0057] A. Add 15 parts by weight of silica aerogel powder and 50 parts by weight of expanded vermiculite powder to a blender and mix at high speed to obtain a composite powder;

[0058] B. Arrange aluminous-magnesious fibers into a thin felt with a thickness of 0.1 - 1 mm. Evenly spray the composite powder on the thin felt through a nozzle, then layer by layer stack the thin felt with the powder sprinkled on it, and press to obtain a fiber felt;

[0059] C. Immerse the fiber felt into the hydrophobic emulsion to make it in full contact. The immersion time is 48 hours. Dry the immersed fiber felt, and the drying temperature is 55°C to obtain a modified fiber felt hydrophobic material. The thermal conductivity of the fiber felt is 0.032, and the mass moisture absorption rate is 2.42%.

[0060] Example 4

[0061] A preparation method of a hydrophobic aerogel thermal insulation felt material includes the following steps:

[0062] A. Add 32 parts by weight of silica aerogel powder and 90 parts by weight of 4A zeolite powder to a blender and mix at high speed to obtain a composite powder;

[0063] B. Arrange aluminosilicate fibers into a thin felt with a thickness of 0.1 - 1 mm, evenly spray the composite powder on the thin felt through a nozzle, then stack the powder-sprinkled thin felts layer by layer, and press to obtain a fiber felt;

[0064] C. Immerse the fiber felt in a hydrophobic emulsion to make full contact with it for 48 hours, and then dry the immersed fiber felt to obtain a modified hydrophobic fiber felt material. The thermal conductivity of the fiber felt is 0.031, and the mass moisture absorption rate is 2.36%.

[0065] Example 5

[0066] A method for preparing a hydrophobic aerogel thermal insulation felt material, comprising the following steps:

[0067] A. Add 50 parts by weight of silica aerogel powder and 110 parts by weight of porous diatomite into a blender and mix at high speed to obtain a composite powder;

[0068] B. Arrange aluminosilicate fibers into a thin felt with a thickness of 0.1 - 1 mm, evenly spray the composite powder on the thin felt through a nozzle, then stack the powder-sprinkled thin felts layer by layer, and press to obtain a fiber felt;

[0069] C. Immerse the fiber felt in a hydrophobic emulsion to make full contact with it for 48 hours, and then dry the immersed fiber felt at a drying temperature of 65 °C to obtain a modified hydrophobic fiber felt material. The thermal conductivity of the fiber felt is 0.032, and the mass moisture absorption rate is 2.45%.

[0070] Example 6

[0071] A method for preparing a hydrophobic aerogel thermal insulation felt material, comprising the following steps:

[0072] A. Add 35 parts by weight of silica aerogel powder and 100 parts by weight of ultrafine talc powder into a blender and mix at high speed to obtain a composite powder;

[0073] B. Arrange aluminosilicate fibers into a thin felt with a thickness of 0.1 - 1 mm, evenly spray the composite powder on the thin felt through a nozzle, then stack the powder-sprinkled thin felts layer by layer, and press to obtain a fiber felt;

[0074] C. Immerse the fiber felt in a hydrophobic emulsion to make full contact with it for 48 hours, and then dry the immersed fiber felt at a drying temperature of 60 °C to obtain a modified hydrophobic fiber felt material. The thermal conductivity of the fiber felt is 0.030, and the mass moisture absorption rate is 2.28%.

[0075] Example 7

[0076] This example is based on Example 3:

[0077] Preparation method of the hydrophobic emulsion:

[0078] C1. Under a nitrogen atmosphere, styrene, allyl hexanoate, dimethyldodecylallylammonium chloride, cetyltrimethylammonium chloride and deionized water are added into a container for pre-emulsification reaction; then an initiator is slowly added dropwise, and the reaction is continued to obtain emulsion A;

[0079] C2. Under a nitrogen atmosphere, butyl acrylate, butyl methacrylate, dodecyl acrylate, cetyltrimethylammonium chloride and deionized water are added into a container for pre-emulsification reaction to obtain emulsion B;

[0080] C3. Emulsion B and azodiisobutyramidine hydrochloride are slowly added dropwise into emulsion A together, and a cationic emulsion is obtained by reaction.

[0081] C4. The cationic emulsion is mixed with an ethanol-water solvent in a ratio of 1:4, and after stirring evenly, sepiolite powder is added, stirred evenly, and left standing for 20 h, and then epoxy resin powder is added, and after stirring evenly, a hydrophobic emulsion is obtained.

[0082] Example 8

[0083] This example is based on Example 4:

[0084] Preparation method of the hydrophobic emulsion:

[0085] C1. Under a nitrogen atmosphere, styrene, allyl hexanoate, dimethyldodecylallylammonium chloride, cetyltrimethylammonium chloride and deionized water are added into a container for pre-emulsification reaction; then an initiator is slowly added dropwise, and the reaction is continued to obtain emulsion A;

[0086] C2. Under a nitrogen atmosphere, butyl acrylate, butyl methacrylate, dodecyl acrylate, cetyltrimethylammonium chloride and deionized water are added into a container for pre-emulsification reaction to obtain emulsion B;

[0087] C3. Emulsion B and azodiisobutyramidine hydrochloride are slowly added dropwise into emulsion A together, and a cationic emulsion is obtained by reaction.

[0088] C4. The cationic emulsion is mixed with an ethanol-water solvent in a ratio of 1:4, and after stirring evenly, sepiolite powder is added, stirred evenly, and left standing for 22 h, and then epoxy resin powder is added, and after stirring evenly, a hydrophobic emulsion is obtained.

[0089] The mass ratio of the styrene, allyl hexanoate and dimethyldodecylallylammonium chloride is 5:5:1; the mass ratio of the butyl acrylate, butyl methacrylate and dodecyl acrylate is 5:4:2.

[0090] In the C1 step and the C2 step described above, the solid-liquid mass ratio of the reaction raw materials is 1:5, wherein cetyltrimethylammonium chloride accounts for 20% of the mass of the solid raw materials.

[0091] In the C4 step described above, the mass ratio of the raw materials is: 25 parts of cationic emulsion, 50 parts of epoxy resin, 8 parts of sepiolite, 80 parts of ethanol, and 320 parts of deionized water.

[0092] Example 9

[0093] This example is based on Example 5:

[0094] The preparation method of the hydrophobic emulsion described above:

[0095] C1. Under a nitrogen atmosphere, styrene, allyl hexanoate, dimethyldodecylallylammonium chloride, cetyltrimethylammonium chloride, and deionized water are added into a container for pre-emulsification reaction; then an initiator is slowly added dropwise, and the reaction continues to obtain emulsion A;

[0096] C2. Under a nitrogen atmosphere, butyl acrylate, butyl methacrylate, dodecyl acrylate, cetyltrimethylammonium chloride, and deionized water are added into a container for pre-emulsification reaction to obtain emulsion B;

[0097] C3. Emulsion B and azobisisobutyramidine hydrochloride are slowly added dropwise into emulsion A together, and the reaction obtains a cationic emulsion.

[0098] C4. The cationic emulsion is mixed with an ethanol-water solvent in a ratio of 1:4, stirred evenly, sepiolite powder is added, stirred evenly, and left standing for 24 h, then epoxy resin powder is added, and after stirring evenly, a hydrophobic emulsion is obtained.

[0099] The mass ratio of styrene, allyl hexanoate, and dimethyldodecylallylammonium chloride is 5:5:1; the mass ratio of butyl acrylate, butyl methacrylate, and dodecyl acrylate is 5:4:2.

[0100] In the C1 step and the C2 step described above, the solid-liquid mass ratio of the reaction raw materials is 1:5, wherein cetyltrimethylammonium chloride accounts for 20% of the mass of the solid raw materials.

[0101] In the C4 step described above, the mass ratio of the raw materials is: 35 parts of cationic emulsion, 50 parts of epoxy resin, 10 parts of sepiolite, 120 parts of ethanol, and 480 parts of deionized water.

[0102] The reaction conditions for the pre-emulsification are: the temperature is room temperature, the rotation speed is 600-1000 rpm / min, and the pre-emulsification is carried out for 30 min; the initiator is slowly added dropwise to the emulsion at 80-90 °C, and the heat preservation reaction is carried out for 2-3 h.

[0103] The particle size of the sepiolite powder is 200 mesh.

[0104] The above embodiments merely represent specific implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A method for preparing a hydrophobic aerogel thermal insulation felt material, characterized in that: The following steps are involved: A. Add 10-50 parts by weight of silica aerogel powder and 50-90 parts by weight of porous or high surface area powder into a blender and mix at high speed to obtain a composite powder; B. Arrange the aluminum-magnesium fibers into a 0.1-1 mm thick thin felt, spray the composite powder evenly on the thin felt through a nozzle, and then stack the powder-sprinkled thin felts layer by layer, and press to obtain a fiber felt; C. Immerse the fiber felt in the hydrophobic emulsion to fully contact with the emulsion for 24-48 hours, and dry the soaked fiber felt at a temperature of 55-65° C. to obtain a hydrophobic aerogel thermal insulation felt.

2. The method for preparing the hydrophobic aerogel thermal insulation felt material according to claim 1, characterized in that: The porous or high surface area powder is one or more of expanded pearlite powder, expanded vermiculite powder, 4A zeolite powder, porous diatomaceous earth and ultrafine talc powder.

3. The method for preparing the aerogel thermal insulation composite material according to claim 1, characterized in that: The weight proportion of the silica aerogel powder in the composite powder is above 25%.

4. The method for preparing the aerogel thermal insulation composite material according to claim 1, characterized in that: The stirring speed of step A is 400-1000 rpm, the stirring temperature is 80-120° C., the stirring is performed for 10-15 minutes, and the composite powder is obtained after cooling.

5. The method for preparing the aerogel thermal insulation composite material according to claim 1, characterized in that: The preparation method of the hydrophobic emulsion comprises the following steps: C1. In a nitrogen atmosphere, a polymerization monomer, a cationic surfactant and deionized water are added into a container to perform a pre-emulsification reaction; then an initiator is slowly added dropwise and the reaction is continued to obtain an emulsion A; C2. Under a nitrogen atmosphere, adding polymerization monomers, cationic surfactants and deionized water into a container to perform a pre-emulsification reaction to obtain emulsion B; C3. Slowly add emulsion B and initiator into emulsion A to react and obtain a cationic emulsion. C4. Mix the cationic emulsion with the ethanol-water solvent, stir evenly, add the sepiolite powder, stir evenly, and let stand for 20-24 hours, then add the epoxy resin powder, stir evenly to obtain the hydrophobic emulsion.

6. The method for preparing the aerogel thermal insulation composite material according to claim 5, characterized in that: In the steps C1 and C2, the solid-liquid mass ratio of the reaction raw materials is 1:5, wherein the cationic surfactant accounts for 20% of the mass of the solid raw materials.

7. The method for preparing the hydrophobic aerogel thermal insulation felt material according to claim 5, characterized in that: The polymerization monomers of step C1 are styrene, allyl hexanoate and dimethyldodecyl allyl ammonium chloride, with a mass ratio of 5:5:1; the polymerization monomers of step C2 are butyl acrylate, butyl methacrylate and dodecyl acrylate, with a mass ratio of 5:4:

2.

8. The method for preparing the hydrophobic aerogel thermal insulation felt material according to claim 5, characterized in that: In the C4 step, the mass ratio of the raw materials is: 25-35 parts of cationic emulsion, 50 parts of epoxy resin, 8-10 parts of sepiolite, 80-120 parts of ethanol and 300-500 parts of deionized water.

9. The method for preparing the hydrophobic aerogel thermal insulation felt material according to claim 8, characterized in that: The volume ratio of the ethanol to the deionized water is 1:

4.

10. The method for preparing the hydrophobic aerogel thermal insulation felt material according to claim 5, characterized in that: The cationic surfactant is hexadecyltrimethylammonium chloride, and the initiator is azobisisobutylamidine hydrochloride.

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