Manufacturing method of fiber fabric heat insulation sheet

Abstract

The invention provides a manufacturing method of a fiber fabric heat insulation sheet, which comprises the following steps: mixing silicon dioxide, aluminum silicate, calcium silicate, fumed silica, an antioxidant and a solvent, and coating a fiber fabric with the mixture for curing. The fiber fabric heat insulation sheet manufactured by the manufacturing method has good heat insulation performance under high-temperature long-time burning, and is not burnt through under the condition of 1200 DEG C high-temperature burning, and the production efficiency and the cost are greatly improved.

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 fabric heat 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. The flame retardant coating on the insulation sheet is a special fireproof protective material. Through its excellent flame retardant properties, it improves the insulation effect and protects its substrate from high temperature damage. Aerogel is a material with a three-dimensional network structure and has extremely low density and thermal conductivity. Therefore, due to the light weight and excellent thermal insulation performance of aerogel, the prior art often uses a combination of aerogel and insulation materials to prepare insulation sheets, so that it has both flame retardant and thermal insulation effects. It is widely used in the aerospace field, battery module insulation of new energy vehicles, battery cell insulation protection, and overall insulation of the body and battery housing. Thermal management. However, the structural strength of aerogel itself is insufficient, and the insulation structure formed by combining with flame retardant materials is limited. In actual application, it needs to be prepared into a felt body, i.e., aerogel felt, for easy application. Moreover, the preparation process of aerogel and its insulation materials is complicated and the cost is extremely high. The price of insulation sheets with aerogel as the substrate remains high. Summary of the invention

[0005] In view of the problems in the current production process of thermal insulation sheets, the present invention provides a method for making a fiber fabric thermal insulation sheet, comprising the following steps:

[0006] A method for manufacturing a fiber fabric thermal insulation sheet comprises the following steps:

[0007] S1: Mixing raw materials with solvent

[0008] The raw materials include, by weight: 10-30 parts of precipitated silica, 1-10 parts of silicate, 70-90 parts of fumed silica, and 1-5 parts of antioxidant.

[0009] The silicate is aluminum silicate and / or calcium silicate, and the solvent is an alcohol solvent or an ester solvent;

[0010] The solvent in the present invention can be an alcohol solvent or an ester solvent in the chemical industry, such as ethanol, ethyl acetate, etc. The present invention does not exclude anhydrous solvents and diluted solvents, and can achieve uniform dissolution of each component. The solvent and the raw material can be mixed in a certain proportion to form a paste slurry with a certain adhesion, which is convenient for subsequent coating on the substrate.

[0011] 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 fabric insulation sheet.

[0012] S2: coating on fiber fabric;

[0013] The fiber fabric in the present invention does not need to be particularly limited, and existing fiber fabrics in the industry can be used, such as glass fiber, ceramic fiber, high silica fiber or basalt fiber commonly used in the industry. The coating method can be completed by existing methods and equipment, such as manual coating, blade coating, etc., and no further description is needed.

[0014] S3: Pressing and forming;

[0015] The pressing method in the present invention does not need to be particularly limited, and the common manual pressing, roller pressing and other methods in the industry can achieve the pressing and forming effect.

[0016] S4: Dry.

[0017] The drying method in the present invention does not need to be particularly limited, and the drying method commonly used in the industry, such as room temperature drying and heating drying, can complete the drying and solidify the slurry on the fiber fabric.

[0018] Further, the precipitated silica is subjected to a modification treatment, and the particle size after modification is no more 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 are common knowledge in this field, and can be adaptively adjusted with reference to common sense knowledge, and will not be repeated here. Precipitated silica can be modified by any existing modification technology, such as by mixing the powder with a coupling agent, a surfactant, an organic oligomer, an unsaturated organic acid, an organosilicon, a water-soluble polymer, and a metal oxide and an alkoxide with a high-speed stirring, thereby improving the dispersibility of the precipitated silica during mixing and the thermal insulation performance during high-temperature combustion. When the particle size of the precipitated silica in the raw material composition of the present invention is greater than 40 nanometers, the fiber fabric thermal insulation sheet produced is prone to uneven pressing, powder loss after high-temperature burning, and the like.

[0019] Furthermore, the silicate is 1-5 parts of aluminum silicate and 1-5 parts of calcium silicate.

[0020] Furthermore, the solvent is ethanol, and its mass is 10-30% of the mass of the raw material.

[0021] Furthermore, the fiber fabric has a mesh structure. Furthermore, the fiber fabric is fiber cotton. Fiber cotton has the characteristics of high temperature resistance, non-flammability, low thermal conductivity, low density, etc.

[0022] The fiber fabric used in the present invention can be selected from commonly used fiber structure fabrics, such as glass fiber, ceramic fiber, high silica fiber or basalt fiber with a mesh structure, and fiber cotton is preferably used. Fiber cotton is a special ultra-fine polyester chemical fiber material with fiber pores formed by a mesh structure, which has the characteristics of breathability, heat insulation, and fluffy, and has a certain flexibility. As the base material of the fiber fabric thermal insulation sheet, it not only has good thermal insulation performance, but also can be easy to fold and wrap, and can be compressed. It can also be replaced with other fiber fabrics according to actual needs. Based on the pore structure inside the fiber fabric, applying the thermal insulation mixture slurry to the fiber fabric can isolate the air from the gaps in the fabric, further enhancing the thermal insulation effect.

[0023] Furthermore, the fiber cotton is high-silica fiber cotton or ceramic fiber cotton. Both high-silica fiber cotton and ceramic fiber cotton can maintain a low thermal conductivity at high temperatures above 1000°C. Compared with aerogel, fiber cotton is flexible, easy to obtain, has a low production cost, and can be applied to a wider range of thermal insulation scenarios.

[0024] 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 fabric thermal insulation sheet produced is prone to uneven pressing, powdering after high-temperature burning, and the like.

[0025] Further, it is characterized in that the raw material also includes at least one of mica, colorant, cellulose, and nano-aluminum trioxide. Further, it is characterized in that 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.

[0026] 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 fabric thermal insulation sheet is used in fields that require insulation, such as electronic devices, mica can be added to the raw materials according to actual needs to improve the insulation performance of the thermal 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 fabric thermal insulation sheet produced is also prone to uneven coating, powder loss after high-temperature burning, and other phenomena.

[0027] 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.

[0028] The colorant in the mixture components of the present invention can dye the fiber fabric without limiting the type, and can be added as needed during the production process of the fiber fabric thermal insulation sheet.

[0029] Nano-aluminum oxide is aluminum oxide with a nanometer particle size, high resistivity, good insulation and anti-reflection properties. Adding nano-aluminum oxide to the mixture of the present invention can increase the anti-ultraviolet performance of the fiber fabric heat insulation sheet, so that it is suitable for use in a variety of outdoor scenes and increases the service life. If the fiber fabric heat insulation sheet is used in a light-proof scene such as battery pack packaging, it is not necessary to add nano-aluminum oxide.

[0030] Furthermore, the coating method in S2 is blade coating. The blade coating in the present invention is a common coating method in the industry, and there is no need to elaborate on the principle. The material can be evenly coated by manual blade coating, mechanical blade coating, etc.

[0031] Furthermore, the pressing method in S3 is roller pressing. The roller pressing method can be implemented by existing equipment in the industry and no further elaboration is required. Roller pressing can evenly spread and shape the slurry, making it easy to control the total amount of slurry per square area according to actual needs.

[0032] Furthermore, molding is performed after the rolling. The realization and principle of molding are common knowledge in the industry and need not be further elaborated. The fiber fabric heat insulation sheet can be shaped and pressed to a desired thickness.

[0033] Furthermore, the curing condition in S4 is heating. Furthermore, the heating temperature is 78-135°C. Curing by heating can greatly shorten the curing time and improve the preparation efficiency. The heating temperature should not be lower than 78°C, otherwise the solvent will not evaporate fully, and the solvent itself is a flammable or heat-conductive substance, which will greatly reduce the thermal insulation effect of the prepared fiber fabric thermal insulation sheet; the heating temperature should not be higher than 135°C, otherwise the paste may crack, causing the internal structure of the slurry to change, thereby affecting the thermal insulation effect of the fiber fabric thermal insulation sheet.

[0034] Furthermore, the drying condition is room temperature or heating.

[0035] As another aspect of the present invention, there is also provided a method for manufacturing a fiber fabric thermal insulation sheet, comprising the following steps:

[0036] S1: Mixing raw materials with solvent

[0037] The raw materials include, by weight: 10-30 parts of precipitated silicon dioxide, 1-5 parts of aluminum silicate, 1-5 parts of calcium silicate, 70-90 parts of fumed silicon dioxide, 1-5 parts of antioxidant, 1-5 parts of mica, 1-5 parts of colorant, 1-5 parts of cellulose, and 1-5 parts of nano aluminum oxide.

[0038] The solvent is ethanol, and its mass is 10-30% of the mass of the raw material.

[0039] 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;

[0040] S2: coating on ceramic fiber cotton by blade coating;

[0041] S3: Roller pressing;

[0042] S4: Compression molding;

[0043] S5: heating and drying, the heating temperature is 80-130℃.

[0044] 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.

[0045] The present invention has the following technical effects:

[0046] The present invention utilizes a clever mix of commonly used inorganic materials such as silicon dioxide and silicate to form a mixture slurry. After being coated on the fiber fabric, the slurry penetrates into the gaps in the fiber structure and firmly adheres to the fiber fabric to form a tight fireproof layer. The thermal insulation cloth produced by this method can significantly improve the flame retardancy, burn-through resistance and heat insulation effects of the fiber fabric thermal insulation sheet. At the same time, the material acquisition and preparation methods of the coating method are simple. The present invention greatly improves production efficiency and cost, and can meet the needs of large-scale production and use.

[0047] The fiber fabric thermal insulation sheet prepared by the present invention can also replace the aerogel thermal insulation material, and can achieve a better fireproof and thermal insulation effect than the aerogel thermal insulation material. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is the first production flow chart of the fiber fabric thermal insulation sheet of the present invention.

[0049] Figure 2 This is a second production flow chart of the fiber fabric thermal insulation sheet of the present invention. DETAILED DESCRIPTION

[0050] 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.

[0051] Example 1

[0052] A method for making a fiber fabric heat insulation sheet comprises the following steps (eg Figure 1 ):

[0053] S1: Mixing raw materials with solvent

[0054] The raw materials include 30 parts of precipitated silica, 5 parts of aluminum silicate, 5 parts of calcium silicate, 90 parts of fumed silica, 5 parts of antioxidant, and a solvent, wherein the solvent is ethyl acetate, and the mass of the solvent is 30% of the total mass of the raw materials;

[0055] The "portions" in this embodiment refer to mass multiples. For example, based on 1 kg, the mixture is 30 kg of precipitated silica, 5 kg of aluminum silicate, 5 kg of calcium silicate, 90 kg of fumed silica, 5 kg of antioxidant, and the mass of ethanol is 40.5 kg.

[0056] S2: Coating on fiber fabric

[0057] The mixture obtained in S1 is applied manually onto the high-silica fiber cotton until the coating is uniform.

[0058] High silica glass fiber is a high temperature resistant inorganic fiber that can be used for a long time at 900°C. Due to its stable chemical properties, high temperature resistance, and ablation resistance, it is widely used in aerospace, metallurgy, chemical industry, building materials, fire protection and other industrial fields.

[0059] S3: Pressing

[0060] The high-silica fiber cotton coated in S2 is manually rolled to make the thickness and shape of the high-silica fiber cotton meet the requirements.

[0061] S4: Drying

[0062] The high-silica fiber cotton pressed and formed in S3 is placed at room temperature to dry, and the coated slurry is allowed to air dry and solidify naturally.

[0063] The fiber fabric thermal insulation sheet product obtained by Example 1 has excellent properties such as flame retardancy, high thermal insulation, light weight, and certain mechanical strength. One side of the fiber fabric thermal insulation sheet is not burned through under high temperature combustion of 1200°C, and the temperature difference between the two sides exceeds 300 degrees. The fiber fabric thermal insulation sheet product obtained in this embodiment also has the physical properties of being light, thin, and flexible, and can be applied to the fire insulation needs of a small space, and can be bent to wrap the items to be insulated in all directions.

[0064] Example 2

[0065] Compared with Example 1, the raw material further includes 5 parts of mica with a particle size of 6 microns, and the corresponding mass of the solvent ethyl acetate is 8.8 kg. Due to the good insulation performance of mica, the insulation performance of the fiber fabric thermal insulation sheet made by adding mica is effectively increased without affecting the fireproof and heat-insulating performance of the fiber fabric thermal insulation sheet.

[0066] Example 3

[0067] Compared with Example 1, the raw material further includes 5 parts of blue colorant, and the corresponding mass of the solvent ethyl acetate is 8.8 kg. After adding the colorant, the finished fiber fabric thermal insulation sheet is blue, which does not affect the fireproof and thermal insulation performance of the fiber fabric thermal insulation sheet.

[0068] Example 4

[0069] Compared with Example 1, the raw material further includes 5 parts of cellulose, and the corresponding mass of the solvent ethyl acetate is 8.8 kg. The viscosity of the mixed slurry in this example is higher than that in Example 1, and the adhesion after coating on the high-silica fiber cotton is stronger and less likely to fall off.

[0070] Example 5

[0071] Compared with Example 1, the raw material further includes 5 parts of nano-aluminum oxide, and the corresponding mass of the solvent ethyl acetate is 8.8 kg. The insulation performance and anti-reflection performance of the fiber fabric thermal insulation sheet produced in this embodiment are both higher than those in Example 1, and can be applied to scenes requiring insulation and anti-ultraviolet aging.

[0072] Example 6

[0073] Compared with Example 1, the pressing method in S3 is to 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 slurry evenly spread on the fiber cotton, and the mass of the slurry applied per unit area can be controlled. The molding machine can be used to press according to the required thickness and shape, and the fiber fabric thermal insulation sheet can be quickly and accurately pressed and shaped evenly, so that the slurry is more fully attached to the fiber. The thermal insulation and fireproof performance of the fiber fabric thermal insulation sheet produced in this embodiment is evenly distributed, which is better than the method of manual pressing in Example 1.

[0074] Example 7

[0075] A method for making a fiber fabric heat insulation sheet comprises the following steps (eg Figure 2 ):

[0076] S1: Mixing raw materials with solvent

[0077] In terms of mass, the mixture is 15 parts of precipitated silica, 3 parts of aluminum silicate, 3 parts of calcium silicate, 80 parts of fumed silica, 2 parts of antioxidant, 2 parts of mica, 1 part of gray colorant, 1 part of cellulose, 2 parts of nano-aluminum oxide, and the solvent is ethanol, which accounts for 20% of the total mass of the mixture.

[0078] The "portions" in this embodiment refer to mass multiples. For example, based on 1 kg, the mixture is 15 kg precipitated silica, 3 kg aluminum silicate, 3 kg calcium silicate, 80 kg fumed silica, 2 kg antioxidant, 2 kg mica, 1 kg colorant, 1 kg cellulose, 2 kg nano-aluminum oxide, and the mass of ethanol is 21.8 kg.

[0079] The particle size of the silicon dioxide is 40 nanometers, and the particle sizes of the aluminum silicate and the mica are 6 micrometers;

[0080] S2: coating on ceramic fiber cotton by blade coating;

[0081] The slurry prepared in S1 is evenly coated on the ceramic fiber cotton using a scraper coater. The scraper coater is a common equipment in the industry that can control the coating thickness and make the coating more even. The fiber fabric thermal insulation sheet prepared has a high yield rate.

[0082] S3: Use a roller press to roll the ceramic fiber cotton coated in S2 evenly;

[0083] S4: Using a molding machine to mold the ceramic fiber wool pressed in S3 into a desired thickness and shape;

[0084] S5: One-time heating and drying, the heating temperature is 130℃. The speed of heating and drying is faster than that of natural drying, which can improve production efficiency and is suitable for mass production.

[0085] The fiber fabric heat insulation sheet produced in this embodiment has high and excellent electrical insulation performance and heat insulation performance, and will not burn through when burned at a high temperature of 1200°C. One side of the fiber fabric heat 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 heat insulation temperature difference within 30 minutes of the test is 371°C, that is, the average temperature of the other side is only 129°C.

[0086]

[0087] The specific parameters of flame retardancy and electrical performance are shown in the following table, which shows that the fiber fabric thermal insulation sheet produced in this embodiment has low density, excellent insulation performance and good flame retardancy.

[0088]

[0089] 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 fabric thermal insulation sheet, comprising the following steps: S1: Mixing raw materials with solvent Calculated by mass, the raw materials include: 10-30 parts of precipitated silica, 1-10 parts of silicate, 70-90 parts of fumed silica, 1-5 parts of antioxidant, The silicate is aluminum silicate and / or calcium silicate, and the solvent is an alcohol solvent or an ester solvent; S2: coating on fiber fabric; S3: Pressing and forming; S4: Dry.

2. 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.

3. 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.

4. The method according to claim 1, characterized in that: The solvent is ethanol, and its mass is 10-30% of the mass of the raw material.

5. The method according to claim 1, characterized in that The fiber fabric has a mesh structure.

6. The method according to claim 5, characterized in that The fiber fabric is fiber cotton.

7. The method according to claim 6, characterized in that The fiber cotton is high-silica fiber cotton or ceramic fiber cotton.

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

9. 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.

10. The method according to claim 9, characterized in that The mass fraction of the mica is 1-5 parts, and the particle size is no more than 6 microns.

11. The method according to claim 9, characterized in that The mass fraction of the colorant is 1-5 parts.

12. The method according to claim 9, characterized in that The mass fraction of the cellulose is 1-5 parts.

13. The method according to claim 9, characterized in that The mass fraction of the nano-aluminum oxide is 1-5 parts.

14. The method according to claim 1, characterized in that The coating method in S2 is blade coating.

15. The method according to claim 1, characterized in that The pressing method in S3 is roll pressing.

16. The method according to claim 15, characterized in that The rolling is followed by compression molding.

17. The method according to claim 1, characterized in that The curing condition in S4 is heating.

18. The method according to claim 17, characterized in that The heating temperature is 78-135°C.

19. The method according to claim 1, characterized in that The drying condition is room temperature or heating.

20. A method for making a fiber fabric thermal insulation sheet, comprising the following steps: S1: Mixing raw materials with solvent Calculated by mass, the raw materials include: 10-30 parts of precipitated silica, 1-5 parts of aluminum silicate, 1-5 parts of calcium silicate, 70-90 parts of fumed silica, 1-5 parts of antioxidant, 1-5 parts of mica, 1-5 parts of colorant, 1-5 parts of cellulose, 1-5 parts of nano-aluminum oxide, The solvent is ethanol, and its mass is 10-30% of the mass of the raw material. 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: Apply to fiber cotton by blade coating; S3: Roller pressing; S4: Compression molding; S5: heating and drying, the heating temperature is 80-130℃.

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