A production method of aerogel felt and the aerogel felt produced thereby

Abstract

The present invention discloses a production method of aerogel felt and the aerogel felt produced thereby. A wet gel felt is prepared; a segmented composite winding device is used for segmented winding. The segmented composite winding device includes two discs, a winding drum and a sleeve. The sleeve is formed by splicing two half sleeves axially split in half. The two discs are arranged relatively at intervals. The winding drum is horizontally installed between the two discs. The discs are evenly and densely provided with a plurality of first drying holes, the winding drum is evenly and densely provided with a plurality of second drying holes, and the half sleeves are evenly and densely provided with third drying holes. The process of segmented winding is as follows: First, the wet gel felt and a flexible water-permeable material are compositely wound on the winding drum to complete the front-segment winding. Then, the two half sleeves are assembled around the front-segment wound felt roll. Thereafter, the wet gel felt and the flexible water-permeable material are compositely wound on the assembled sleeve to complete the rear-segment winding. Then, it is dried and the sleeve is disassembled. The present invention solves the problem of indentations generated by the flexible water-permeable material on the fiber surface of the wet gel felt.

Description

Technical Field

[0001] The present invention belongs to the technical field of aerogel felt preparation, and particularly relates to a production method of aerogel felt and the aerogel felt produced thereby. Background Art

[0002] SiO2 aerogel is a type of heat insulation material that has received extensive attention. It is a porous material prepared from highly cross-linked inorganic gels through a special drying process. The pore size ranges from a few nanometers to dozens of nanometers, and it has a very high specific surface area. This special structure enables the SiO2 aerogel material to have an extremely low thermal conductivity, which can effectively inhibit heat conduction and heat convection, and is considered to be the solid material with the best heat insulation performance.

[0003] Due to the brittleness of silica aerogel, the use range of particles, blocks or powders is greatly limited. Therefore, it is necessary to compound the aerogel with flexible fiber materials to improve the mechanical properties of the aerogel and expand its use range. The current compounding methods mainly include the following two:

[0004] 1. Batch production: Place the fiber material in a suitable container, pour the sol into it, and the sol penetrates into the pores between the fiber materials. After a certain period of time, the gelation is completed. After the gelation is completed, usually the entire roll of material needs to be taken out for unwinding, and the fiber composite gel and the flexible interlayer permeable to fluids are wound up again. This permeable fluid interlayer separates the layers of the fiber composite gel, aiming to facilitate the outflow of the liquid for gel aging, and in the subsequent drying process, it strengthens the replacement of the drying medium and the solvent in the gel in the radial direction, and in the height direction, the drying medium can smoothly flow through the inside of the entire roll of material, both of which can shorten the entire drying time. This method can meet the production requirements to a certain extent.

[0005] 2. Semi-continuous production: Unroll the roll-shaped fiber material on the equipment and move it in one direction driven by a moving element. During the conveying process, the unfolded fibers are combined with the sol, and the sol penetrates into the fiber materials and moves together with the fiber materials. After gelation on the moving element, it is wound up at the other end of the equipment. When winding up after the gelation is completed, it is necessary to compound and wind up the fiber composite gel and the flexible interlayer permeable to fluids. This permeable fluid interlayer separates the layers of the fiber composite gel, and the purpose is also to facilitate the outflow of the liquid for gel aging.

[0006] In the above production process, after winding up the flexible interlayer permeable to fluids and the fiber material together for production, it will inevitably cause indentations on the surface of the fiber material by the flexible interlayer, affecting the product quality of the fiber-reinforced aerogel composite material. Summary of the Invention

[0007] In order to solve the problem of indentation on the surface of fiber materials caused by the flexible interlayer during the production process, the purpose of the present invention is to provide a production method of aerogel felt.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A production method of aerogel felt, the steps are as follows:

[0010] (1) Prepare a wet gel felt;

[0011] (2) Composite the wet gel felt obtained in step (1) with a flexible water-permeable material and wind it on a reel. Among them, the composite winding is carried out in sections by a sectional composite winding device. The sectional composite winding device includes two discs, a reel and a sleeve. The sleeve is formed by splicing two half-sleeves that are axially split in half. The two discs are arranged at intervals. The reel is horizontally installed between the two discs. The discs are evenly distributed with a number of first drying holes, the reel is evenly distributed with a number of second drying holes, and the half-sleeves are evenly distributed with a number of third drying holes. The process of sectional winding is as follows: First, composite the wet gel felt obtained in step (1) with a flexible water-permeable material and wind it on the reel until the pressure of the outermost layer of the obtained wound felt on the innermost layer is 3-8 kPa, then complete the front-section winding to obtain a front-section wound felt. Then, assemble the two half-sleeves around the front-section wound felt to form a complete sleeve. There is a gap (1-3 cm) reserved between the inner wall of the sleeve and the front-section wound felt. The two ends of the two half-sleeves are respectively fixed on the two discs. After that, composite the wet gel felt with the flexible water-permeable material and wind it on the assembled sleeve to complete the rear-section winding to obtain a rear-section wound felt;

[0012] (3) Dry the sectional composite winding device in step (2) together with the front-section wound felt and the rear-section wound felt on it. After drying, disassemble the sleeve, remove the rear-section wound felt and the front-section wound felt and remove the flexible water-permeable material to obtain the aerogel felt.

[0013] In the present invention, there are preferably two ways to fixedly connect the two half-sleeves to the two discs, specifically as follows:

[0014] Connection method 1: At both inner walls of the half sleeve, a semi-circular first connecting plate is fixedly connected respectively. When the two half sleeves are assembled into a complete sleeve, the two semi-circular first connecting plates are also assembled into a complete circular first connecting plate. A number of bolt holes are evenly and densely distributed on the semi-circular first connecting plate, and one bolt hole corresponds to one first drying hole. The diameter of the bolt hole is smaller than that of the first drying hole. Nuts corresponding to the bolt holes one by one are fixed on the inner side wall of the semi-circular first connecting plate. A positioning circular plate is installed in the first drying hole corresponding to the bolt hole. A positioning hole with the same size as the bolt hole is opened at the center of the positioning circular plate. A T-shaped bolt is inserted through the positioning hole and the bolt hole, and the head of the T-shaped bolt is located on the outer side wall of the disc and the tail is screwed and fixed in the nut.

[0015] Preferably, the positioning circular plate is frustum-shaped, and the small end of the positioning circular plate faces outward and is installed in the first drying hole.

[0016] Connection method 2: At both inner walls of the half sleeve, a semi-circular first connecting plate is fixedly connected respectively. A circular second connecting plate is fixedly connected to the outer side walls of the two discs respectively. When the two half sleeves are assembled into a complete sleeve, the two semi-circular first connecting plates are also assembled into a complete circular first connecting plate, and the size and position of the circular first connecting plate correspond exactly to those of the circular second connecting plate. A number of pairs of bolt holes corresponding to each other are evenly and densely distributed on the semi-circular first connecting plate and the second connecting plate respectively, and each pair of bolt holes corresponds to one first drying hole. The diameter of the bolt hole is smaller than that of the first drying hole. Nuts corresponding to the bolt holes one by one are fixed on the inner side wall of the semi-circular first connecting plate. A T-shaped bolt is inserted through each pair of bolt holes on the semi-circular first connecting plate and the second connecting plate, and the head of the T-shaped bolt is located on the outer side wall of the disc and the tail is screwed and fixed in the nut.

[0017] Through the above two connection methods, the sleeve of the present invention can be quickly installed and fixed on the disc, and the sleeve can be quickly disassembled after production is completed, which is convenient for the staff to install and disassemble.

[0018] Preferably, when the two half sleeves are assembled into a sleeve, a gap is provided axially between the two half sleeves for the wet gel felt (the thickness of the wet gel felt is 0.1 - 10 mm) to pass through. Since the fiber felt used in the preparation of the wet gel felt is usually a 20 - 100 m continuous fiber felt, and the lengths of fiber felts with different thickness specifications are different. By providing a gap axially between the two half sleeves for the wet gel felt to pass through, it can be avoided that the continuous fiber felt is cut when the front section is not completely wound up during the installation of the sleeve.

[0019] Preferably, in step (3), before drying, the segmented composite winding device together with the front-section winding felt and the rear-section winding felt thereon is subjected to aging treatment. The aging treatment is carried out by maintaining the material to be aged at 30-70 °C for 1-10 h. The aging step can bond more Si-O-Si bonds, form a more stable gel network structure of the wet gel, promote the retention of the pore structure in the subsequent drying process, and thus improve the mechanical stability of the aerogel felt. The gelled wet gel felt is aged within an appropriate temperature range to reduce the gel microporous structure, enhance the optimal pore structure, and increase the permeability and mechanical properties of the gel. When the aging temperature is lower than 30 °C, the aging time will be longer. When the aging temperature is higher than 70 °C, the temperature exceeds the boiling point of ethanol, which will evaporate and cause solvent loss.

[0020] Preferably, in step (3), before drying, the segmented composite winding device together with the front-section winding felt and the rear-section winding felt thereon is subjected to surface hydrophobic treatment with a hydrophobization modification liquid. When both aging treatment and surface hydrophobic treatment exist before drying, the aging treatment is carried out first and then the surface hydrophobic treatment. The hydrophobization modification liquid is a modification liquid formed by mixing a hydrophobization reagent and ethanol in a molar ratio of 1:(2-5). The hydrophobization reagent is an organosilane compound, and the organosilane compound includes trimethylchlorosilane, hexamethyldisilazane, methyltrimethoxysilane, trimethylethoxysilane, ethyltriethoxysilane, phenyltriethoxysilane, etc. The surface hydrophobic treatment with the hydrophobization modification liquid means that the material to be hydrophobized is impregnated in the hydrophobization modification liquid for modification, and after modification, 1-2 washings are carried out. The washing is to remove impurities such as unreacted substances and by-products during the modification reaction.

[0021] Preferably, in step (3), after drying but before removing the rear-section winding felt and the front-section winding felt by splitting the sleeve and removing the flexible water-permeable material, the segmented composite winding device together with the front-section winding felt and the rear-section winding felt thereon is subjected to surface hydrophobic treatment with a gas-phase hydrophobization reagent; or after removing the rear-section winding felt and the front-section winding felt by splitting the sleeve and removing the flexible water-permeable material, the aerogel felt is cut into aerogel sheet felts or rewound into aerogel roll felts. At this time, the aerogel sheet felts or aerogel roll felts are subjected to surface hydrophobic treatment with a gas-phase hydrophobization reagent. The gas-phase hydrophobization reagent is obtained by heating the hydrophobization reagent into steam, and the surface hydrophobic treatment with the gas-phase hydrophobization reagent means introducing the gas-phase hydrophobization reagent into the material to be hydrophobized for modification.

[0022] Surface hydrophobization treatment makes the hydroxyl groups on the wet gel felt, such as the silanol groups (Si-OH) present in the silica gel skeleton, react with the functional groups of the hydrophobization reagent, converting the silanol groups and the hydrophobization reagent into hydrophobic groups on the silica gel skeleton. The amount of hydrophobization reagent used for surface hydrophobization modification with a gaseous hydrophobization reagent is relatively less than that used for surface hydrophobization modification with a liquid-phase hydrophobization modification solution, which can effectively reduce the production cost.

[0023] Preferably, in step (3), the aerogel felt is cut into aerogel sheet felts or rewound into aerogel roll felts, so that the aerogel felt products are finally applied in the form of aerogel roll felts and aerogel sheet felts.

[0024] Preferably, the flexible water-permeable material refers to an elastic material with a porous surface for convenient liquid passage. The flexible water-permeable material is larger than or equal to the width of the wet gel felt in the width direction and also larger than or equal to the length of the wet gel felt in the length direction. Under a pressure of 1-15 Mpa, the thickness of the flexible water-permeable material can be compressed by 10-90%. Its material is selected from one or more of polyurethane, polysiloxane (silicone rubber), fluoropolymer, polyvinyl chloride, polyacrylate, polyoxymethylene, polyolefin, polystyrene, polyacrylonitrile, polyamide, polyether ether ketone, polyethersulfone resin, polyester resin, and polyetherimide, and it can be reused. The flexible water-permeable material of the present invention preferably uses a flexible wire mesh of the above materials.

[0025] An aerogel felt produced by the described production method.

[0026] Beneficial effects: By setting a rigid sleeve during winding, the rigid sleeve is installed on the periphery of the front-section wound felt, and the rear-section is wound on the rigid sleeve. The rigid sleeve exerts no pressure on the front-section wound felt and provides a supporting force for the rear-section wound felt. The rigid sleeve can prevent the rear-section wound felt from generating a tension force on the front-section wound felt during the winding process and avoid the rear-section wound felt from exerting a pressure on the front-section wound felt, thereby solving the problem of the flexible water-permeable material generating indentations on the fiber surface of the wet gel felt due to the action of pressure and tension force, improving the qualified rate of the aerogel felt products, reducing the production cost, and since the rigid sleeve is provided with a plurality of third drying holes, the rigid sleeve has water permeability and does not affect the fluid flow inside the wound wet gel felt. Description of the Drawings

[0027] Figure 1 : Front view of the segmented composite winding device before installing the sleeve;

[0028] Figure 2 : Figure 1 Left / right side view of;

[0029] Figure 3: Front view of the segmented composite winding device after installing the sleeve;

[0030] Figure 4 : Figure 3 Left / right side view of

[0031] Figure 5 : Figure 3 A - A sectional view of

[0032] Figure 6 : Front view of the connection schematic diagram between the semi - sleeve and the semi - circular first connecting plate;

[0033] Figure 7 : Figure 6 Left / right side view of

[0034] Figure 8 : Perspective view of the connection schematic diagram between the semi - sleeve and the semi - circular first connecting plate;

[0035] Figure 9 : Schematic diagram of the first connection method between two semi - sleeves and two discs;

[0036] Figure 10 : Schematic diagram of the second connection method between two semi - sleeves and two discs;

[0037] Figure 11 : Front view of the segmented composite winding device after installing the sleeve (with a gap provided on the sleeve);

[0038] Among them, the reference numerals are: 1 - disc; 2 - winding drum; 3 - semi - sleeve; 41 - first drying hole, 42 - second drying hole, 43 - third drying hole; 5 - semi - circular first connecting plate; 6 - bolt hole; 7 - nut; 8 - positioning circular plate; 9 - positioning hole; 10 - T - shaped bolt; 11 - circular second connecting plate; 12 - gap. Detailed implementation method

[0039] To make the present invention clearer and more definite, the following further details the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] Embodiment 1

[0041] A production method of aerogel felt is as follows:

[0042] (1), Prepare a wet gel felt according to the existing technology;

[0043] (2), Compound and wind the wet gel felt obtained in step (1) with a flexible water - permeable material (polyurethane wire mesh) on a reel; among them, the compound winding is carried out in segments by a segmented composite winding device, and the structure of the segmented composite winding device is asFigure 1-8 As shown in the figure, it includes two discs 1, a reel 2 and a sleeve. The sleeve is formed by splicing two half-sleeves 3 that are axially split in half; the two discs 1 are arranged at intervals relative to each other. The reel 2 is horizontally installed between the two discs 1. The disc 1 is evenly and densely distributed with a number of first drying holes 41, the reel 2 is evenly and densely distributed with a number of second drying holes 42, and the half-sleeve 3 is evenly and densely distributed with a number of third drying holes 43. The process of segmented winding is as follows: First, the wet gel felt obtained in step (1) and the flexible permeable material are compounded and wound on the reel 2 until the pressure of the outermost layer of the obtained wound felt on the innermost layer of the wound felt is 5 kPa, and the front-segment winding is completed to obtain the front-segment wound felt. Then, the two half-sleeves 3 are assembled around the front-segment wound felt to form a complete sleeve. A gap (2 cm) is reserved between the inner wall of the sleeve and the front-segment wound felt. The two ends of the two half-sleeves 3 are respectively fixed on the two discs 1. After that, the wet gel felt and the flexible permeable material are compounded and wound on the assembled sleeve to complete the rear-segment winding and obtain the rear-segment wound felt.

[0044] (3) Dry the segmented composite winding device in step (2) together with the front-segment wound felt and the rear-segment wound felt thereon. After drying, disassemble the sleeve, remove the rear-segment wound felt and the front-segment wound felt, and remove the flexible permeable material, and then wind again to obtain the aerogel wound felt.

[0045] Among them, in this embodiment, the fixed connection method between the two half-sleeves 3 and the two discs 1 is as Figure 9 shown: The inner walls of the two ends of the half-sleeve 3 are respectively fixedly connected with a semi-circular first connecting plate 5. The two semi-circular first connecting plates 5 are spliced into a complete circular first connecting plate while the two half-sleeves 3 are spliced into a complete sleeve. The semi-circular first connecting plate 5 is evenly and densely distributed with a number of bolt holes 6 and one bolt hole 6 corresponds to one first drying hole 41. The diameter of the bolt hole 6 is smaller than the diameter of the first drying hole 41. A nut 7 corresponding to the bolt hole 6 is fixed on the inner side wall of the semi-circular first connecting plate 5. A positioning circular plate 8 is installed in the first drying hole 41 corresponding to the bolt hole 6. The positioning circular plate 8 is frustum-shaped, and the small end of the positioning circular plate 8 faces outward and is installed in the first drying hole 41. A positioning hole 9 with the same size as the bolt hole 6 is opened in the center of the positioning circular plate 8. A T-shaped bolt 10 is passed through the positioning hole 9 and the bolt hole 6, and the head of the T-shaped bolt 10 is located on the outer side wall of the disc 1 and the tail is screwed and fixed in the nut 7.

[0046] Embodiment 2

[0047] The difference between this embodiment and Embodiment 1 is that the fixed connection method between the two half-sleeves 3 and the two discs 1 is as Figure 10As shown in the figure: At both ends of the semi-sleeve 3, an inner wall is fixedly connected with a semi-circular ring-shaped first connecting plate 5 respectively. On the outer side walls of the two discs 1, a circular ring-shaped second connecting plate 11 is fixedly connected respectively. When the two semi-sleeves 3 are combined into a complete sleeve, the two semi-circular ring-shaped first connecting plates 5 are also combined into a complete circular ring-shaped first connecting plate, and the size and position of this circular ring-shaped first connecting plate correspond exactly to those of the circular ring-shaped second connecting plate 11. A number of corresponding pairs of bolt holes 6 are uniformly and densely distributed on the semi-circular ring-shaped first connecting plate 5 and the second connecting plate respectively, and each pair of bolt holes 6 corresponds to a first drying hole 41. The aperture of the bolt hole 6 is smaller than that of the first drying hole 41. Nuts 7 corresponding to the bolt holes 6 one by one are fixed on the inner side wall of the semi-circular ring-shaped first connecting plate 5. A T-shaped bolt 10 is inserted into each pair of bolt holes 6 on the semi-circular ring-shaped first connecting plate 5 and the second connecting plate, and the head of the T-shaped bolt 10 is located on the outer side wall of the disc 1, and the tail is screwed and fixed in the nut 7.

[0048] Others are the same as in Embodiment 1.

[0049] Embodiment 3

[0050] The difference from Embodiment 1 is that in step (3), before drying, the segmented composite winding device together with the front-segment winding felt and the rear-segment winding felt thereon is subjected to an aging treatment, and the aging treatment means keeping the segmented composite winding device together with the front-segment winding felt and the rear-segment winding felt thereon at 60 °C for 5 h.

[0051] Others are the same as in Embodiment 1.

[0052] Embodiment 4

[0053] The difference between this embodiment and Embodiment 3 is that in step (3), after the aging treatment before drying, the segmented composite winding device together with the front-segment winding felt and the rear-segment winding felt thereon is immersed in a hydrophobically modified liquid for hydrophobic modification, and after modification, it is washed twice; the hydrophobically modified liquid is formed by mixing trimethylethoxysilane and absolute ethanol in a molar ratio of 1:3.

[0054] Others are the same as in Embodiment 3.

[0055] Embodiment 5

[0056] The difference from Embodiment 1 is that in step (3), after drying but before removing the rear-segment winding felt and the front-segment winding felt from the split sleeve and removing the flexible water-permeable material, a gas-phase hydrophobically modifying reagent is introduced into the segmented composite winding device together with the front-segment winding felt and the rear-segment winding felt thereon for hydrophobic modification; the gas-phase hydrophobically modifying reagent is obtained by heating methyltrimethoxysilane to 102 °C to form steam.

[0057] Others are the same as in Embodiment 1.

[0058] Example 6

[0059] The difference from Example 3 is as follows: In step (3), after the aging treatment before drying, after removing the rear-section winding felt and the front-section winding felt and removing the flexible water-permeable material after taking down the split sleeve, the aerogel felt is cut into aerogel sheet felts, and a gas-phase hydrophobizing reagent is introduced into the aerogel sheet felts for hydrophobization modification; the gas-phase hydrophobizing reagent is obtained by heating ethyltriethoxysilane to 157 °C to form steam.

[0060] Others are the same as those in Example 3.

[0061] Example 7

[0062] The difference from Example 1 is that as Figure 11 shown, when the two half sleeves are assembled into a sleeve, there is a gap 12 axially arranged between the two half sleeves for the wet gel felt to pass through, and the thickness of the wet gel felt is 8 mm.

[0063] Others are the same as those in Example 1.

Claims

1. A production method of aerogel felt, characterized in that, The steps are as follows: (1) Prepare a wet gel felt; (2) Composite the wet gel felt obtained in step (1) with a flexible water-permeable material and wind it up on a reel. Among them, the composite winding is carried out in sections by a sectional composite winding device. The sectional composite winding device includes two discs, a reel and a sleeve. The sleeve is formed by splicing two half-sleeves that are axially split in half. The two discs are arranged at intervals relative to each other. The reel is horizontally installed between the two discs. The discs are evenly and densely provided with a number of first drying holes. The reel is evenly and densely provided with a number of second drying holes. The half-sleeves are evenly and densely provided with third drying holes. The process of sectional winding is as follows: First, composite the wet gel felt obtained in step (1) with a flexible water-permeable material and wind it up on the reel until the pressure from the outermost layer to the innermost layer of the obtained wound felt is 3-8 kPa, then complete the front-section winding to obtain a front-section wound felt. Then, assemble the two half-sleeves around the front-section wound felt to form a complete sleeve. There is a gap reserved between the inner wall of the sleeve and the front-section wound felt. The two ends of the two half-sleeves are respectively fixed on the two discs. After that, composite the wet gel felt with a flexible water-permeable material and wind it up on the assembled sleeve to complete the rear-section winding and obtain a rear-section wound felt; (3) Dry the sectional composite winding device in step (2) together with the front-section wound felt and the rear-section wound felt thereon, disassemble the sleeve, remove the rear-section wound felt and the front-section wound felt, and remove the flexible water-permeable material to obtain an aerogel felt.

2. The production method of the aerogel felt according to claim 1, characterized in that The fixed connection method between the two half-sleeves and the two discs is as follows: The inner walls of the two ends of the half-sleeves are respectively fixedly connected with a semi-circular first connecting plate. When the two semi-circular first connecting plates are spliced into a complete sleeve, they are also spliced into a complete circular first connecting plate. The semi-circular first connecting plate is evenly and densely provided with a number of bolt holes, and one bolt hole corresponds to one first drying hole. The diameter of the bolt hole is smaller than the diameter of the first drying hole. Nuts corresponding to the bolt holes are fixed on the inner side wall of the semi-circular first connecting plate. A positioning circular plate is installed in the first drying hole corresponding to the bolt hole. A positioning hole with the same size as the bolt hole is opened in the center of the positioning circular plate. A T-shaped bolt is inserted through the positioning hole and the bolt hole, and the head of the T-shaped bolt is located on the outer side wall of the disc and the tail is screwed and fixed in the nut.

3. The production method of the aerogel felt according to claim 2, wherein: The positioning circular plate is in a frustum shape, and the small end of the positioning circular plate faces outward and is installed in the first drying hole.

4. The production method of the aerogel felt according to claim 1, characterized in that: The fixed connection method between the two half sleeves and the two discs is as follows: at both ends of the inner wall of the half sleeve, a semi-circular ring-shaped first connecting plate is fixedly connected respectively. On the outer side walls of the two discs, a circular ring-shaped second connecting plate is fixedly connected respectively. When the two half sleeves are combined into a complete sleeve, the two semi-circular ring-shaped first connecting plates are also combined into a complete circular ring-shaped first connecting plate, and the size and position of the circular ring-shaped first connecting plate correspond exactly to those of the circular ring-shaped second connecting plate. A number of corresponding pairs of bolt holes are uniformly and densely distributed on the semi-circular ring-shaped first connecting plate and the second connecting plate respectively, and each pair of bolt holes corresponds to a first drying hole. The aperture of the bolt hole is smaller than that of the first drying hole. Nuts corresponding to the bolt holes one by one are fixed on the inner side wall of the semi-circular ring-shaped first connecting plate. A T-shaped bolt is inserted into each pair of bolt holes on the semi-circular ring-shaped first connecting plate and the second connecting plate, and the head of the T-shaped bolt is located on the outer side wall of the disc, and the tail is screwed and fixed in the nut.

5. The production method of the aerogel felt according to claim 1, characterized in that: When the two half sleeves are combined into a sleeve, a gap for the wet gel felt to pass through is provided axially between the two half sleeves.

6. The production method of the aerogel felt according to claim 1, characterized in that: In step (3), before drying, the segmented composite winding device together with the front-segment winding felt and the rear-segment winding felt thereon is subjected to an aging treatment.

7. The production method of the aerogel felt according to claim 1, characterized in that: In step (3), before drying, the segmented composite winding device together with the front-segment winding felt and the rear-segment winding felt thereon is subjected to a surface hydrophobic treatment with a hydrophobization modification liquid.

8. The production method of the aerogel felt according to claim 1, characterized in that: In step (3), after drying but before disassembling the sleeve to remove the rear-segment winding felt and the front-segment winding felt and removing the flexible water-permeable material, the segmented composite winding device together with the front-segment winding felt and the rear-segment winding felt thereon is subjected to a surface hydrophobic treatment with a gas-phase hydrophobization reagent; or after disassembling the sleeve to remove the rear-segment winding felt and the front-segment winding felt and removing the flexible water-permeable material, the aerogel felt is cut into aerogel sheet felts or rewound into aerogel roll felts. At this time, the aerogel sheet felts or aerogel roll felts are subjected to a surface hydrophobic treatment with a gas-phase hydrophobization reagent.

9. The production method of the aerogel felt according to claim 1, characterized in that: In step (3), the aerogel felt is cut into aerogel sheet felts or rewound into aerogel roll felts.

10. An aerogel felt produced by the production method according to any one of claims 1-9.

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