Manufacturing method of cellosilk heat insulation sheet

Abstract

The invention provides a manufacturing method of a cellosilk heat-resisting sheet. The manufacturing method comprises the following steps: mixing materials such as precipitated silicon dioxide, silicate and fumed silica with a binder, and carrying out compression molding. A three-dimensional network structure can be formed in the cellosilk heat insulation sheet manufactured through the manufacturing method, the heat insulation performance is good under high-temperature long-time burning, burning through is avoided under the condition of 1200 DEG C high-temperature burning, the production efficiency is greatly improved, and the cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat insulation material processing, and in particular to a method for manufacturing a fiber insulation sheet. Background Art

[0002] The statements herein merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] In the fields of new energy vehicles, buildings, pipelines, batteries, e-cigarettes, etc., high-temperature combustion of fire and the spread of thermal runaway will seriously affect public safety, and there is a high demand for thermal insulation, flame retardant and fireproof materials.

[0004] In the industry, equipment that needs insulation or flammable materials are usually wrapped with insulation sheets for insulation. Aerogel has extremely low density and thermal conductivity. The existing technology often uses flame retardant coatings on aerogels to prepare insulation sheets. The flame retardant coatings solidify and adhere to the aerogels to achieve flame retardant properties, improve insulation effects and protect the substrate from high temperature damage. It is widely used in the aerospace field, thermal insulation of battery modules of new energy vehicles, thermal protection of battery cells, and overall thermal insulation of vehicle bodies and battery shells.

[0005] According to the inventors' understanding, the existing technology mostly adopts the method of combining flame retardant coating with aerogel, such as applying thermal insulation coating on aerogel in Document 1 to improve thermal insulation performance, and packaging aerogel felt after combining aerogel with flame retardant coating in Document 2 to prevent powder loss from affecting thermal insulation performance. However, due to the insufficient structural strength of aerogel itself, the thermal insulation structure formed by combining with flame retardant materials is limited, and the thermal insulation performance increased by improving the thermal insulation performance of flame retardant materials on aerogel in the existing technology is also relatively limited.

[0006] References:

[0007] Document 1: China invention patent publication, publication number CN119242107A, non-stick flame retardant coating and thermal insulation sheet

[0008] Document 2: China invention patent publication, publication number CN118029170A, an environmentally friendly flame retardant coating for aerogel felt packaging and its preparation method Summary of the invention

[0009] In view of the problems in the current production process of thermal insulation sheets, the present invention provides a method for making a fiber insulation sheet, comprising the following steps:

[0010] S1: Mixing raw materials and fiber filaments under vacuum conditions

[0011] Calculated by mass, the raw materials include:

[0012] 10-30 parts of precipitated silica,

[0013] 1-10 parts of silicate, wherein the silicate is aluminum silicate and / or calcium silicate,

[0014] 70-90 parts of fumed silica,

[0015] 1-5 parts antioxidants;

[0016] The fiber filaments include first fiber filaments and second fiber filaments, the mass of the first fiber filaments is 1-10% of the mass of the raw material, and the mass of the second fiber filaments is 5-20% of the mass of the raw material.

[0017] The mixing under vacuum conditions described in the present invention can be achieved by existing vacuum mixing methods or equipment. The specific principles and implementations thereof will not be described in detail in the present invention. Mixing under such conditions can form a vacuum structure inside the raw material particles, and the thermal conductivity is almost 0, which can greatly improve the thermal insulation performance of the raw materials.

[0018] The antioxidants in the raw material components of the present invention refer to some organic compounds that can inhibit or delay the thermal oxidation of polymers and other organic compounds in the air, that is, substances that can prevent polymer materials from deteriorating due to oxidation. Commonly used industrial antioxidants mainly include aromatic amine antioxidants and hindered phenol antioxidants, which can effectively improve the high temperature resistance and thermal insulation effect of the fiber insulation sheet.

[0019] The fiber filaments in the present invention have low thermal conductivity, which makes them have strong thermal insulation properties. Commonly used thermal insulation fiber filaments in the industry include ceramic fiber, high silica fiber, basalt fiber, aluminum silicate fiber, glass fiber, etc., and there is no need to limit the specific types. After adding the fiber filaments, it can be mixed with the raw materials to form a more stable structure, thereby improving the thermal insulation performance and stress-strain performance of the finished product.

[0020] S2: Add binder and mix;

[0021] The binder in the present invention does not need to be specifically limited in type. The binder is a commonly used adhesive in the industry, such as an inorganic binder and an organic binder, which is convenient for evenly bonding the raw materials and facilitating subsequent molding.

[0022] S3: Compression molding.

[0023] The pressing method in the present invention does not need to be particularly limited, and the common manual pressing, roller pressing, molding and other methods in the industry can all achieve the pressing and forming effect.

[0024] Furthermore, the mixing condition in S1 is stirring at a speed of 600-2000 rpm. The stirring speed setting in the present invention can make the raw materials and fiber filaments fully dispersed and stirred evenly, and the stirring time does not need to be limited and can be adjusted according to the uniformity of stirring and mixing.

[0025] Furthermore, the mixing condition in S2 is spraying. Furthermore, the spraying method is: spraying the binder around the mixed material in S1. The spraying method in the present invention can be achieved by existing methods without specific limitation, such as manual spraying, spraying device, etc. The particle size of the binder droplets sprayed by spraying is finer, which can make the binder more evenly dispersed in the raw materials and fiber filaments, enhance the overall bonding effect and heat insulation effect, and improve the scratch resistance of the finished product, so that the finished product is not easy to scrape off the powder, and increase the service life.

[0026] Furthermore, the pressing method in S3 is roller pressing. Roll pressing can be achieved by existing methods and devices in the industry, and no further elaboration is required. Roll pressing can evenly lay and shape the raw materials and fiber filaments, making it easy to control the total amount of raw materials and fiber filaments per square area according to actual needs.

[0027] Furthermore, the pressing method in S3 is rolling followed by molding, and the molding pressure is not higher than 1 MPa. Molding can also be achieved by existing methods and devices in the industry, and the material can be pressed to the required thickness, but the pressure must not be too high. If the pressure is higher than 1 MPa, the hollow structure in the raw material powder may be damaged, affecting the thermal insulation performance of the finished product.

[0028] Furthermore, the silicate is 1-5 parts of aluminum silicate and 1-5 parts of calcium silicate.

[0029] Furthermore, the length of the first fiber filament is 5-10 mm.

[0030] Furthermore, the length of the second fiber filament is 1-5 mm.

[0031] Furthermore, the mass of the second fiber filaments is not lower than the mass of the first fiber filaments.

[0032] In the present invention, the first fiber filament and the second fiber filament may be the same or different types of fiber filaments. Whether the first fiber filament and B are the same material or not, the conductive properties of the finished product will not be significantly affected. The length of the first fiber filament and the second fiber filament should not be too long or too short. If the length exceeds the range, it will be difficult to mix and disperse fully, and the pressed finished product will present a filamentary texture. If the length is shorter than the range, the fiber filament structure inside the finished product will be unstable, and it will be easy to lose powder and break.

[0033] In the present invention, the length of the second fiber filament is shorter than that of the first fiber filament, so that the mesh structure formed by the mixing of the longer first fiber filaments can be filled with the second fiber filaments to form a more stable structure, so that the stress-strain performance and thermal insulation performance of the fiber insulation sheet produced can be improved. Moreover, adding more second fiber filaments can make it more fully fill the gaps interwoven by the first fiber filaments, increase the flatness of the finished product, help improve the powder loss problem of the finished product, and improve the stress-strain and thermal insulation performance of the fiber insulation sheet.

[0034] Further, the precipitated silica is modified, and the particle size after modification is not greater than 40 nanometers. Modification is a method of changing the surface properties and structure of the powder, which can improve the dispersibility, stability and compatibility of the powder particles with polymers, so that it can better adapt to the specific application requirements. The modification treatment and the specific treatment process and principle can be achieved by existing methods in the art, and can be adaptively adjusted with reference to common sense knowledge, which will not be repeated here. Precipitated silica can be modified by any existing modification technology, such as by mixing coupling agents, surfactants, organic oligomers, unsaturated organic acids, silicones, water-soluble polymers, and metal oxides and alcohol salts with powders at high speeds, thereby improving the dispersibility of the precipitated silica during mixing and the thermal insulation performance during high-temperature combustion, so that the surface of the fiber insulation sheet can be cured more quickly after high-temperature combustion, and the flame retardant and thermal insulation performance is improved. When the particle size of the precipitated silica in the raw material composition of the present invention is greater than 40 nanometers, the fiber insulation sheet produced is prone to uneven pressing and powder loss after high-temperature burning.

[0035] Furthermore, the particle size of the aluminum silicate is not greater than 6 microns. When the particle size of the aluminum silicate or calcium silicate in the present invention is greater than 6 microns, the fiber insulation sheet produced is prone to uneven pressing, powdering after high-temperature burning, etc., but it does not significantly affect the insulation performance.

[0036] Further, the raw material also includes at least one of mica, colorant, cellulose, and nano-aluminum trioxide. Further, the mass fraction of the mica is 1-5 parts, and the particle size is not greater than 6 microns. Further, the mass fraction of the colorant is 1-5 parts. Further, the mass fraction of the cellulose is 1-5 parts. Further, the mass fraction of the nano-aluminum trioxide is 1-5 parts.

[0037] Mica is a general term for mica minerals, which have very high insulation and heat insulation properties, good chemical stability, and resistance to strong acids, strong alkalis, and pressure. If the fiber insulation sheet is used in fields that require insulation, such as electronic devices, the present invention preferably adds mica to the raw materials, which can greatly improve the insulation performance of the fiber insulation sheet. In order to match the other mixed components in the present invention, the particle size of mica should not be greater than 6 microns, otherwise the fiber insulation sheet produced is also prone to uneven coating, powder loss after high-temperature burning, and other phenomena.

[0038] The colorant in the present invention can dye the fiber filaments, and the colorant can be a dyeing material of any color, and can be added as needed during the production process of the fiber filament thermal insulation sheet.

[0039] Cellulose is a common natural macromolecular compound with good viscosity and stability. In the present invention, cellulose is preferably added to the raw material to increase the viscosity of the mixture and improve the adhesion of the slurry on the fiber fabric.

[0040] Nano-alumina is aluminum oxide with a nanometer particle size, high resistivity, good insulation and anti-reflection properties. Adding nano-alumina to the mixture of the present invention can increase the anti-ultraviolet performance of the fiber insulation sheet, so that it is suitable for use in a variety of outdoor scenes and increases the service life. If the fiber insulation sheet is used in a light-proof scene such as battery pack packaging, it is not necessary to add nano-alumina.

[0041] Furthermore, the mass of the binder is 1-10% of the mass of the raw material. Furthermore, the binder includes at least one of inorganic silica sol, cellulose, and starch ether. The main function of the binder is to bond the raw material to the fiber filament, and its mass ratio should not be too high. If it is higher than 10% of the raw material mass, it may affect the thermal insulation and fireproof performance of the finished product.

[0042] Furthermore, it also includes S4: vacuum packaging the fiber insulation sheet with a flame retardant film. The flame retardant film is a common wrapping material in the industry, such as polyester film, PET film, etc., which has good thermal insulation and flame retardant properties and a small thickness. Wrapping the fiber insulation sheet with the flame retardant film can increase the stress-strain performance and prevent the finished product from falling off.

[0043] Furthermore, before S4, a hydrophobic material is sprayed on the surface of the pressed fiber insulation sheet. Hydrophobic materials are commonly used in the industry, including aerogel coatings, polysiloxane coatings, etc. After being sprayed on the surface of the fiber insulation sheet, it can be used in a humid environment. The moisture in the environment will not affect the powder in the fiber insulation sheet, and it is suitable for more usage scenarios.

[0044] As another aspect of the present invention, there is also provided a method for manufacturing a fiber insulation sheet, comprising the following steps:

[0045] S1: Mixing raw materials and fiber filaments under vacuum conditions

[0046] The raw materials include, by weight: 10-30 parts of precipitated silica, 70-90 parts of fumed silica, 1-5 parts of aluminum silicate, 1-5 parts of calcium silicate, 1-5 parts of mica, 1-5 parts of colorant, 1-5 parts of cellulose, 1-5 parts of nano aluminum oxide, and 1-5 parts of antioxidant.

[0047] The fiber filaments include a first fiber filament and a second fiber filament, the mass of the first fiber filament is not less than the mass of the second fiber filament, the mass of the first fiber filament is 1-3% of the mass of the raw material, and the mass of the second fiber filament is 5%-10% of the mass of the raw material,

[0048] The length of the first fiber filament is 5-10 mm, the length of the second fiber filament is 1-5 mm,

[0049] The particle size of the precipitated silica is not greater than 40 nanometers, and the particle sizes of the aluminum silicate and the mica are not greater than 6 micrometers;

[0050] In the present invention, the first fiber filaments and the second fiber filaments may be of the same or different types without limitation. The quality of the first fiber filaments and the second fiber filaments may be adjusted according to the type and length, and both may be used to make fiber insulation sheets.

[0051] S2: Add binder and mix

[0052] The binder is an inorganic adhesive, and its mass is 1-5% of the mass of the raw material;

[0053] S3: Roller pressing;

[0054] S4: Molding, pressure not higher than 1MPa;

[0055] Furthermore, it also includes:

[0056] S5: spraying a hydrophobic material on the surface of the pressed fiber insulation sheet;

[0057] S6: vacuum-packaging the fiber insulation sheet with a flame-retardant film.

[0058] In the present invention, compression molding and packaging are not essential steps and can be adopted according to the actual needs of the finished fiber insulation sheet.

[0059] The limitation of relevant values ​​in the above description does not absolutely exclude values ​​outside the description range. In order to circumvent the protection scheme of this patent, those skilled in the art may choose to adjust the relevant values ​​within a small range in order to circumvent the protection of this patent by reducing production capacity and / or reducing product quality, which should be regarded as equivalent to infringement. In addition, those skilled in the art may also replace the substances used in this patent with similar substances with similar functions and effects in order to circumvent the protection scheme of this patent, which should also be regarded as equivalent to infringement.

[0060] The present invention has the following technical effects:

[0061] The present invention uses precipitated silica, silicate and other commonly used inorganic materials and fiber filaments to mix and compress the heat insulation cloth to achieve good flame retardant, burn-through resistance and heat insulation effects, and can adapt to scenes with heat insulation requirements. Moreover, the present invention has a simple process, greatly improves production efficiency and cost, and can meet the needs of mass production and use.

[0062] The fiber filament thermal insulation sheet prepared by the present invention can also replace the traditional aerogel thermal insulation material and the existing thermal insulation glass fiber cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is the first production flow chart of the fiber yarn thermal insulation sheet of the present invention.

[0064] Figure 2 This is a second production flow chart of the fiber yarn thermal insulation sheet of the present invention. DETAILED DESCRIPTION

[0065] Since the relevant types of chemical materials and mixing equipment and coating equipment are already existing technologies, the embodiment section only describes some of the more relevant parameters. As for the properties of the relevant materials and other necessary operating specifications or the use and adjustment of relevant parameters, reference can be made to the general knowledge in the field and they will not be repeated in the embodiments.

[0066] Example 1

[0067] 1. A method for making a fiber insulation sheet, comprising the following steps (eg Figure 1 ):

[0068] S1: Mix the raw materials and fiber filaments evenly under vacuum conditions

[0069] The raw materials include, by weight: 10 parts of precipitated silica, 1 part of aluminum silicate, 70 parts of fumed silica, and 1 part of antioxidant;

[0070] The fiber filaments include ceramic fibers and high-silica fibers. The mass of the ceramic fibers is 1% of the mass of the raw materials, and the mass of the high-silica fibers is 5% of the mass of the raw materials. The length of the ceramic fibers is 5 mm, and the length of the high-silica fibers is 1 mm.

[0071] The raw materials and fiber filaments are stirred and mixed under vacuum at a speed of 600 rpm, and the powder and fiber filaments in the raw materials are evenly dispersed and mixed, which can make the thermal insulation performance of the finished product more uniform, and it is not easy to have problems such as filament defects or powder loss due to the failure of some fiber filaments to be dispersed. The vacuum mixer is an existing equipment, and the specific structure and principle are not repeated here.

[0072] S2: Add binder and mix;

[0073] The binder is inorganic silica sol, which is added to 1% of the raw material mass. The binder is evenly sprayed into the raw material and fiber filament mixture in S1 by manual spraying, so that the raw material and the fiber filament are bonded to facilitate subsequent pressing and molding.

[0074] S3: Compression molding.

[0075] The fiber insulation sheet can be obtained by spreading and shaping the mixture of S2 and the spray glue to a desired shape and thickness using a roller press.

[0076] The fiber filament thermal insulation sheet product obtained by Example 1 has excellent properties such as flame retardancy, high thermal insulation, flexibility, light weight, and certain mechanical strength. At the same time, since the fiber filament thermal insulation sheet obtained in this embodiment has a hollow structure between and inside the powder, it has certain stress-strain properties and can be further compressed to meet the actual assembly scenario with limited space.

[0077] Example 2

[0078] Compared with Example 1, the raw material further includes 5 parts of mica with a particle size of 6 microns. Due to the good insulation performance of mica, the insulation performance of the fiber insulation sheet made by adding mica is effectively increased without affecting the fireproof and heat-insulating performance of the fiber insulation sheet.

[0079] Example 3

[0080] Compared with Example 1, the raw material further includes 5 parts of blue colorant. After adding the colorant, the fiber filament thermal insulation sheet is blue, which does not affect the fireproof and thermal insulation performance of the fiber filament thermal insulation sheet.

[0081] Example 4

[0082] Compared with Example 1, the raw material further includes 5 parts of cellulose. The viscosity of the mixed slurry in this example is higher than that in Example 1, and the adhesion after being coated on the high-silica fiber cotton is stronger and less likely to fall off.

[0083] Example 5

[0084] Compared with Example 1, the raw material further comprises 5 parts of nano aluminum oxide. The insulation performance and anti-reflection performance of the fiber insulation sheet produced in this example are both higher than those in Example 1, and can be applied to scenes requiring insulation and anti-ultraviolet aging.

[0085] Example 6

[0086] Compared with Example 1, the pressing method in S2 is to first use a roller press for pressing, and then use a roller press for molding. The roller press and the molding machine are both prior art, and the specific principles will not be repeated. The use of a roller press can make the material evenly laid on the fiber cotton, and the mass of the mixed material laid per unit area can be controlled. Then, the molding machine can be used to press according to the required thickness and shape, and the fiber filament thermal insulation sheet can be quickly and accurately pressed and shaped evenly. The thermal insulation and fireproof performance of the fiber filament thermal insulation sheet produced in this embodiment is evenly distributed, which is better than the single rolling method in Example 1.

[0087] Example 7

[0088] A method for making a fiber insulation sheet comprises the following steps (eg Figure 2 ):

[0089] S1: Mixing raw materials and fiber filaments under vacuum conditions

[0090] The raw materials include, by weight: 10-30 parts of precipitated silica, 70-90 parts of fumed silica, 1-5 parts of aluminum silicate, 1-5 parts of calcium silicate, 1-5 parts of mica, 1-5 parts of colorant, 1-5 parts of cellulose, 1-5 parts of nano aluminum oxide, and 1-5 parts of antioxidant.

[0091] The fiber filaments include a first fiber filament and a second fiber filament, both of which are aluminum silicate fibers, the mass of the first fiber filament is 3% of the mass of the raw material, and the mass of the second fiber filament is 10% of the mass of the raw material,

[0092] The length of the first fiber filament is 10 mm, the length of the second fiber filament is 5 mm,

[0093] The particle size of the precipitated silica is not greater than 40 nanometers, and the particle sizes of the aluminum silicate and the mica are not greater than 6 micrometers;

[0094] The raw materials and fiber filaments prepared in this step are evenly mixed and in powder form, and enter step S2 through a blanking device. The blanking device is a commonly used device in the industry, and its structure and principle need not be elaborated.

[0095] S2: Add binder and mix

[0096] The powders dropped in step S1 are uniformly sprayed with an inorganic binder, the mass of which is 5% of the mass of the raw materials. The inorganic binder is dispersed into extremely fine droplets and uniformly adheres to the powders, so that the raw materials and fiber filaments in the powders can be bonded to form a stable structure, greatly improving the thermal insulation effect.

[0097] S3: Roller pressing;

[0098] The material is pressed and flattened using existing roller pressing equipment, and the quality of the material per unit area is controlled to facilitate precise mass production.

[0099] S4: Molding, pressure is 1MPa;

[0100] The rolled fiber insulation sheet is shaped by existing molding equipment and molded to a thickness of 2 mm.

[0101] S5: spraying a hydrophobic material on the surface of the pressed fiber insulation sheet;

[0102] In step S4, the surface of the fiber insulation sheet after compression molding is uniformly sprayed with a polysiloxane coating so that the fiber insulation sheet is covered with a hydrophobic layer. Compared with Example 1, the finished product prepared in this example can be used in a humid environment, the fiber insulation sheet will not lose its insulation effect due to soaking in water, and the problem of powder falling is reduced.

[0103] S6: vacuum-packaging the fiber insulation sheet with a flame-retardant film.

[0104] The fiber insulation sheet is vacuum packaged with a flame-retardant PET film having a heat-insulating effect. The technology of vacuum packaging film is common knowledge in the industry, and there is no need to elaborate on the equipment and principle. Compared with Example 1, the fiber insulation sheet after packaging has stronger stress-strain performance and better heat-insulating effect.

[0105] The fiber insulation sheet produced in this embodiment has high insulation performance and does not burn through under high temperature combustion of 1200°C. One side of the fiber insulation sheet in this embodiment is continuously burned at 500°C, and the temperature of the other side is detected every minute and the temperature difference is calculated. The average insulation temperature difference within 30 minutes of the test is 418°C, that is, the average temperature of the other side is only 82°C.

[0106]

[0107] The specific parameters of the flame retardant and electrical properties are shown in the following table. It can be seen that the fiber insulation sheet produced in this embodiment has a small density, excellent insulation performance and good flame retardancy.

[0108]

[0109] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for making a fiber insulation sheet, comprising the following steps: S1: Mixing raw materials and fiber filaments under vacuum conditions Calculated by mass, the raw materials include: 10-30 parts of precipitated silica, 1-10 parts of silicate, wherein the silicate is aluminum silicate and / or calcium silicate, 70-90 parts of fumed silica, 1-5 parts antioxidants; The fiber filaments include a first fiber filament and a second fiber filament, and the first fiber filament and the second fiber filament have different lengths; S2: Add binder and mix; S3: Compression molding.

2. The method according to claim 1, characterized in that The mixing condition in S1 is stirring, and the rotation speed is 600-2000 rpm.

3. The method according to claim 1, characterized in that The mixing condition in S2 is spraying.

4. The method according to claim 3, characterized in that The spraying method is: spraying the binder around the mixed material in S1.

5. The method according to claim 1, characterized in that The pressing method in S3 is roller pressing.

6. The method according to claim 5, characterized in that The pressing method in S3 is rolling followed by molding, and the molding pressure is not higher than 1 MPa.

7. The method according to claim 1, characterized in that The mass of the first fiber filaments is 1-10% of the mass of the raw material, and the mass of the second fiber filaments is 5-20% of the mass of the raw material.

8. The method according to claim 1, characterized in that The silicate is 1-5 parts of aluminum silicate and 1-5 parts of calcium silicate.

9. The method according to claim 1, characterized in that: The length of the first fiber filament is 5-10 mm, and the length of the second fiber filament is 1-5 mm.

10. The method according to claim 1 or 9, characterized in that: The mass of the second fiber filaments is not lower than the mass of the first fiber filaments.

11. The method according to claim 1, characterized in that: The precipitated silica is modified so that the particle size is no greater than 40 nanometers.

12. The method according to claim 1, characterized in that The particle size of the aluminum silicate is no greater than 6 microns.

13. The method according to claim 1, characterized in that The raw materials also include at least one of mica, colorant, cellulose and nano-aluminum oxide.

14. The method according to claim 13, characterized in that The mass fraction of the mica is 1-5 parts, and the particle size is no more than 6 microns.

15. The method according to claim 13, characterized in that The mass fraction of the colorant is 1-5 parts.

16. The method according to claim 13, characterized in that The mass fraction of the cellulose is 1-5 parts.

17. The method according to claim 13, characterized in that The mass fraction of the nano-aluminum oxide is 1-5 parts.

18. The method according to claim 1, characterized in that The mass of the binder is 1-10% of the mass of the raw material.

19. The method according to claim 18, characterized in that The binder includes at least one of inorganic silica sol, cellulose and starch ether.

20. The method according to claim 1, characterized in that The method further comprises S4: vacuum packaging the fiber insulation sheet with a flame retardant film.

21. The method according to claim 20, characterized in that Before S4, a hydrophobic material is sprayed on the surface of the pressed fiber insulation sheet.

22. A method for making a fiber insulation sheet, comprising the following steps: S1: Mixing raw materials and fiber filaments under vacuum conditions Calculated by mass, the raw materials include: 10-30 parts of precipitated silica, 70-90 parts of fumed silica, 1-5 parts of aluminum silicate, 1-5 parts of calcium silicate, 1-5 parts of mica, 1-5 parts of colorant, 1-5 parts of cellulose, 1-5 parts of nano aluminum oxide, 1-5 parts of antioxidant, The fiber filaments include a first fiber filament and a second fiber filament, the mass of the second fiber filament is not less than the mass of the first fiber filament, the mass of the first fiber filament is 1-3% of the mass of the raw material, and the mass of the second fiber filament is 5%-10% of the mass of the raw material, The length of the first fiber filament is 5-10 mm, the length of the second fiber filament is 1-5 mm, The particle size of the precipitated silica is not greater than 40 nanometers, and the particle sizes of the aluminum silicate and the mica are not greater than 6 micrometers; S2: Add binder and mix The binder is an inorganic adhesive, and its mass is 1-5% of the mass of the raw material; S3: Roller pressing; S4: Molding, pressure not higher than 1MPa.

23. The method according to claim 22, characterized in that Also includes: S5: spraying a hydrophobic material on the surface of the pressed fiber insulation sheet; S6: vacuum-packaging the fiber insulation sheet with a flame-retardant film.

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