Fireproof adhesive tape for protecting coil and preparation method thereof

Abstract

The invention discloses a fireproof adhesive tape for protecting a coil and a preparation method thereof, and relates to the technical field of fireproof adhesive tape, the adhesive tape comprises a base material layer and an adhesive layer, the base material layer comprises the following raw materials: polyurethane, glass fiber, modified boron nitride nanotubes, a flame retardant, a cross-linking agent, a defoaming agent, an auxiliary agent and water; wherein the modified boron nitride nanotubes comprise boron nitride nanotubes, carboxymethyl cellulose sodium and hyaluronic acid in a mass ratio of 5: 6: 6, the boron nitride nanotubes are modified, so that the distribution uniformity of the boron nitride nanotubes can be greatly improved, sodium ether salt is formed on the surfaces of the boron nitride nanotubes, and the stability, strength and flame-retardant and fireproof effects of the base material layer are improved; therefore, the fireproof adhesive tape for protecting the coil has higher flame-retardant and fireproof performance.

Description

Technical Field

[0001] The invention relates to the technical field of fireproof tapes, and in particular to a fireproof tape for protecting a coil and a preparation method thereof. Background Art

[0002] The coil may generate high temperature during operation, especially in some high-power or long-running equipment. In high temperature environment, the insulation layer of the coil is prone to aging, cracking, and even fire. Fireproof tape has excellent high temperature resistance and can effectively prevent the coil from being damaged at high temperature. When a fire occurs, the coil is a key component of electrical equipment. Once damaged, it may cause equipment failure or even aggravate the fire. Fireproof tape is made of flame-retardant or flame-retardant materials, which can resist the burning of flames for a certain period of time, buy time for personnel evacuation and fire fighting, and reduce the degree of damage to the coil caused by the fire.

[0003] Based on this, improving the flame retardancy of fireproof tape is of great significance for preventing fires caused by electrical faults. Summary of the invention

[0004] The purpose of the present invention is to provide a fireproof tape for protecting coils and a preparation method thereof, so as to solve the following technical problems:

[0005] How to improve the flame retardancy of fireproof tape?

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] In a first aspect, the present invention discloses a fireproof tape for protecting a coil, comprising a substrate layer and an adhesive layer, wherein the substrate layer comprises the following raw materials in parts by weight:

[0008] 50-80 parts of polyurethane, 5-10 parts of glass fiber, 10-15 parts of modified boron nitride nanotubes, 15-20 parts of flame retardant, 0.5-1 parts of crosslinking agent, 0.1-0.2 parts of defoaming agent, 0.5-1 parts of auxiliary agent, 50-80 parts of water;

[0009] The modified boron nitride nanotubes include boron nitride nanotubes, sodium hydroxymethyl cellulose and hyaluronic acid in a mass ratio of 5:6:6.

[0010] Furthermore, the preparation method of the modified boron nitride nanotubes is:

[0011] The first step is to dissolve boron nitride nanotubes in water to form solution A, dissolve hydroxymethyl cellulose in water to form solution B, mix solution A and solution B evenly, add acetic acid to adjust the pH to 4, and react at 60°C for 2 hours to obtain a mixed solution; in this process, sodium hydroxymethyl cellulose undergoes a grafting reaction with the boron nitride nanotubes, thereby being grafted on the surface of the boron nitride nanotubes, so that the surface of the boron nitride nanotubes is modified, which can enhance its dispersion performance in water, and make the obtained mixed solution homogeneous.

[0012] Preferably, the mass fraction of boron nitride nanotubes in solution A is 5-10%, preferably 8%; the mass fraction of hydroxymethyl cellulose in solution B is 20-25%, preferably 24%.

[0013] Step 2: Dissolve hyaluronic acid in water to form solution C, pour solution C into the mixed solution at room temperature, stir while pouring, continue stirring for 10 minutes after completion, then filter and wash the filter material with ethanol, vacuum dry the filter material, grind it into powder to obtain modified boron nitride nanotubes; hyaluronic acid contains a large number of hydroxyl groups, in this process, a large number of hydroxyl groups react with sodium in sodium hydroxymethyl cellulose grafted on the surface of boron nitride nanotubes to form sodium ether salt, the sodium ether salt has good stability and is in microcrystalline form, which can enhance the surface strength of boron nitride nanotubes.

[0014] Preferably, the mass fraction of hyaluronic acid in solution C is 20-25%, preferably 24%.

[0015] Preferably, the filter material is placed in a vacuum drying oven for drying, the vacuum drying temperature is 80-100° C., and the drying time is 12 h;

[0016] Preferably, the drying temperature is 90°C.

[0017] Based on this, a preferred preparation method of the modified boron nitride nanotubes of the present invention is obtained, which is as follows:

[0018] Step 1: dissolving boron nitride nanotube powder (Dalian Yibang Technology Co., Ltd., 20um) in water to form a solution A with a mass fraction of 8%, dissolving hydroxymethyl cellulose in water to form a solution B with a mass fraction of 24%, mixing solution A and solution B evenly, adding acetic acid dropwise to adjust the pH to 4, and reacting at 60°C for 2h to obtain a mixed solution;

[0019] Step 2: Dissolve hyaluronic acid in water to form a solution C with a mass fraction of 24%, pour the solution C into the mixed solution at room temperature, stir while pouring, continue stirring for 10 minutes after completion, then filter and wash the filter material with ethanol, place the filter material in a vacuum drying oven at 90°C for 12 hours, add the filter material to a grinder and grind it into powder to obtain modified boron nitride nanotubes.

[0020] Furthermore, the flame retardant is a composite flame retardant, including nitrogen-based flame retardants, phosphorus-based flame retardants, and silicon-based flame retardants; among which, the nitrogen-based flame retardant is preferably melamine, the phosphorus-based flame retardant is preferably tributyl phosphate, and the silicon-based flame retardant is preferably polysiloxane.

[0021] Furthermore, the crosslinking agent is any one of diisopropylbenzene peroxide, diethylenetriamine, tetrahydrophthalic acid glycoside, and hexahydrophthalic anhydride, preferably tetrahydrophthalic acid glycoside.

[0022] Furthermore, the defoaming agent is one of polydimethylsiloxane or ethylene oxide; preferably polydimethylsiloxane.

[0023] Furthermore, the auxiliary agent is any one of benzyl alcohol, ethylene glycol butyl ether, and propylene glycol methyl ether acetate; preferably benzyl alcohol.

[0024] Furthermore, the material of the adhesive layer is organic silicone water.

[0025] Based on this, a preferred embodiment of the present invention is obtained:

[0026] In a second aspect, the present invention further discloses a method for preparing the fireproof tape for protecting a coil as described above, comprising the following steps:

[0027] S1: polyurethane, glass fiber, defoamer, additive, and water are sequentially added into a stirring tank and mixed evenly, and then modified boron nitride nanotubes, flame retardant, and cross-linking agent are sequentially added under stirring and stirred evenly to obtain a mixture, and the mixture is prepared into a film by a film making machine to obtain a substrate layer;

[0028] Preferably, the film making machine can be an extruder, a film blowing machine, a coater, or the like.

[0029] S2: Evenly apply organic silica gel water on one side of the substrate layer, bake it at high temperature and then roll it into a material to obtain a fireproof tape for protecting the coil.

[0030] Beneficial effects of the present invention:

[0031] (1) In the fireproof tape for protecting coils of the present invention, modified boron nitride nanotubes are added to the substrate layer, and the surface of the boron nitride nanotubes is grafted with sodium hydroxymethyl cellulose to improve the dispersibility of the boron nitride nanotubes, so that the boron nitride nanotubes are distributed more evenly on the substrate surface to enhance their performance. At the same time, sodium ether salt is generated by the reaction of hyaluronic acid and sodium hydroxymethyl cellulose. The sodium ether salt has good stability and is in a microcrystalline state, which can enhance the surface strength of the boron nitride nanotubes. At the same time, the sodium ether salt etherifies the boron nitride nanotubes and makes them sticky, which can better combine with other substances in the substrate layer, and can greatly improve the distribution uniformity of the modified boron carbide nanotubes and improve the stability of the substrate layer.

[0032] (2) In the fireproof tape for protecting coils of the present invention, the sodium in the sodium ether salt on the surface of the nanotubes in the modified boron nitride nanotubes has a low melting point and is easy to form a molten state when heated, and has good mass transfer and heat transfer effects, and can quickly and evenly transfer heat to the surface of the substrate layer, so that the flame retardant components therein quickly reach the decomposition temperature, thereby decomposing to produce flame-retardant gases such as CO2, CO, NH3, N2, H2O, etc. During the process of gas release, air is prevented from entering the substrate layer. At the same time, under high temperature and oxygen deficiency conditions, some substances in the flame retardant are carbonized to form a dense carbon layer, thereby achieving a better flame retardant effect.

[0033] (3) In the fireproof tape for protecting coils of the present invention, the boron nitride nanotubes in the modified boron nitride nanotubes contain boron and nitrogen elements, so they themselves have good thermal insulation and flame retardancy. In addition, due to their tubular structure, they can achieve a good smoke capture mechanism. That is, the flame-retardant gas generated by the decomposition of the flame retardant can be quickly absorbed into the tube by the boron nitride nanotubes to prevent it from continuing to generate smoke, thereby improving its smoke suppression ability and further improving the flame retardant and fire prevention effect. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The invention discloses a fireproof tape for protecting a coil, comprising a base material layer and an adhesive layer, wherein the material of the adhesive layer is organic silica gel water, and the base material layer comprises the following raw materials in parts by weight:

[0036] 50-80 parts of polyurethane, 5-10 parts of glass fiber, 10-15 parts of modified boron nitride nanotubes, 15-20 parts of flame retardant, 0.5-1 parts of crosslinking agent, 0.1-0.2 parts of defoaming agent, 0.5-1 parts of auxiliary agent, 50-80 parts of water;

[0037] The modified boron nitride nanotubes include boron nitride nanotubes, sodium hydroxymethyl cellulose and hyaluronic acid in a mass ratio of 5:6:6, and the preparation method thereof is as follows:

[0038] The first step is to dissolve boron nitride nanotubes in water to form a solution A with a mass fraction of 5-10%, dissolve hydroxymethyl cellulose in water to form a solution B with a mass fraction of 20-25%, mix solution A and solution B evenly, add acetic acid dropwise to adjust the pH to 4, and react at 60° C. for 2 hours to obtain a mixed solution; during this process, sodium hydroxymethyl cellulose undergoes a grafting reaction with the boron nitride nanotubes, thereby being grafted onto the surface of the boron nitride nanotubes, so that the surface of the boron nitride nanotubes is modified, and its dispersibility in water can be enhanced, so that the obtained mixed solution is in a homogeneous state;

[0039] Step 2: dissolving hyaluronic acid in water to form a solution C with a mass fraction of 20-25%, pouring the solution C into the mixed solution at room temperature, stirring while pouring, and continuing to stir for 10 minutes after the end, then filtering and washing the filter material with ethanol, vacuum drying the filter material at 80-100°C for 12 hours, grinding it into powder to obtain modified boron nitride nanotubes; hyaluronic acid contains a large number of hydroxyl groups. In this process, a large number of hydroxyl groups react with the sodium in the sodium hydroxymethyl cellulose grafted on the surface of the boron nitride nanotubes to generate sodium ether salts. The sodium ether salts have good stability and are in a microcrystalline state, which can enhance the surface strength of the boron nitride nanotubes. At the same time, the sodium ether salts etherify the boron nitride nanotubes and make them sticky, which can better combine with other substances in its substrate layer.

[0040] The flame retardant is a composite flame retardant, including nitrogen flame retardant, phosphorus flame retardant and silicon flame retardant; among them, the nitrogen flame retardant is preferably melamine, the phosphorus flame retardant is preferably tributyl phosphate, and the silicon flame retardant is preferably polysiloxane.

[0041] The crosslinking agent is any one of diisopropylbenzene peroxide, diethylenetriamine, tetrahydrophthalic acid glycoside, and hexahydrophthalic anhydride, preferably tetrahydrophthalic acid glycoside.

[0042] The defoaming agent is one of polydimethylsiloxane or ethylene oxide; polydimethylsiloxane is preferred.

[0043] The auxiliary agent is any one of benzyl alcohol, ethylene glycol butyl ether, and propylene glycol methyl ether acetate; preferably benzyl alcohol.

[0044] The preparation method of the fireproof tape for protecting coils of the present invention comprises the following steps:

[0045] S1: polyurethane, glass fiber, defoamer, additive, and water are sequentially added into a stirring kettle and mixed evenly, and then modified boron nitride nanotubes, flame retardant, and crosslinking agent are sequentially added under stirring and stirred evenly to obtain a mixture, and the mixture is prepared into a film by a film-making machine such as an extruder, a film blowing machine, or a coater to obtain a substrate layer;

[0046] S2: Evenly apply organic silica gel water on one side of the substrate layer, bake it at high temperature and then roll it into a material to obtain a fireproof tape for protecting the coil.

[0047] The fireproof tape for protecting coils of the present invention has excellent fireproof and flame retardant properties, which is mainly because the modified boron nitride nanotubes added in the substrate layer play a more flame retardant role. The tape is wrapped around the outside of the coil to protect the coil. When exposed to high temperature or fire, the sodium in the sodium ether salt on the surface of the modified boron nitride nanotubes has a low melting point and is easy to form a molten state when heated. It has good mass transfer and heat transfer effects, and can quickly and evenly transfer heat to the surface of the substrate layer, so that the flame retardant components therein quickly reach the decomposition temperature, thereby decomposing to produce flame retardant gases such as CO2, CO, NH3, N2, H2O, etc., and preventing air from entering the substrate layer during the process of gas release. At the same time, under high temperature and oxygen deficiency, some substances in the flame retardant are carbonized to form a dense carbon layer, thereby achieving a better flame retardant effect.

[0048] At the same time, the sodium ether salt on the surface of the boron nitride nanotubes has good stability and is in a microcrystalline state, which can enhance the surface strength of the boron nitride nanotubes. At the same time, the sodium ether salt makes the boron nitride nanotubes etherified and sticky, which can better combine with other substances in its substrate layer, making the distribution of the boron nitride nanotubes better. The flame-retardant gas generated by the decomposition of the flame retardant can be quickly absorbed into the boron nitride nanotubes to prevent them from continuing to produce smoke, thereby improving their smoke suppression ability and further improving the flame retardant and fire prevention effects.

[0049] The following will be combined with specific examples and comparative examples to prove that the base material layer in the fireproof tape for protecting coils of the present invention has stronger fireproof performance. The experimental methods in the following examples are conventional methods unless otherwise specified, and are carried out according to the techniques or conditions described in the literature in the field or according to the product instructions. The materials, reagents, etc. used in the following examples, unless otherwise specified, can all be obtained from commercial channels.

[0050] Example 1

[0051] Preparation of modified boron nitride nanotubes:

[0052] Step 1: Pour 242 mL of water into beaker 1, then add 20 g of boron nitride nanotube powder (Dalian Yibang Technology Co., Ltd., 20 um), and stir evenly with a clean glass rod to obtain solution A; Pour 76 mL of water into beaker 2, then add 24 g of sodium hydroxymethyl cellulose, and stir evenly with a clean glass rod to obtain solution B, then pour solution B into beaker 1 and mix with solution A, stirring while pouring, and after stirring evenly, add acetic acid (mass fraction: 80%) to beaker 1 with a rubber-tipped dropper, adjust the pH to 4, and then transfer beaker 1 to a water bath, heat the water bath to 60°C and keep warm, continue stirring for 2 hours, and obtain a mixed solution.

[0053] Step 2: Pour 76 mL of water into beaker 3, then add 24 g of hyaluronic acid, stir evenly with a clean glass rod to obtain solution C; after the mixed solution is cooled to room temperature, slowly pour solution C into the mixed solution, stirring while pouring, and continue stirring for 10 minutes after pouring, then filter with a funnel to obtain a filter material, repeatedly wash the filter material with ethanol three times, place the filter material in a vacuum drying oven, vacuum dry at 90°C for 12 hours, and then add it to a ball mill to grind into powder to obtain 51 g of modified boron nitride nanotubes.

[0054] Comparative Example 1

[0055] Preparation of modified boron nitride nanotubes: Compared with Example 1, the only difference is that solution C is not added, and other conditions are exactly the same. The specific preparation steps are as follows:

[0056] Step 1: Exactly the same as step 1 in Example 1.

[0057] Step 2: Filter the mixed solution with a funnel to obtain a filter material, wash the filter material repeatedly with ethanol three times, place the filter material in a vacuum drying oven, vacuum dry it at 90° C. for 12 hours, and then add it to a ball mill to grind it into powder to obtain modified boron nitride nanotubes.

[0058] Example 2

[0059] Preparation of substrate layer: 50g polyurethane, 5g glass fiber, 0.1g polydimethylsiloxane, 0.5g benzyl alcohol, 50g water were added into a stirring tank, stirred at 500rpm for 30min, then 10g modified boron nitride nanotubes prepared in Example 1, 15g flame retardant (5g melamine, 5g tributyl phosphate, 5g polysiloxane), 0.5g tetrahydrophthalic acid glycoside were added in sequence and stirred at 500rpm for 1h to obtain a mixture, the mixture was spread on a glass plate with a thickness of 2mm, and then the glass plate was placed in a vacuum drying oven and vacuum dried at 80°C for 10h. After taking out, the mixture formed a transparent film on the glass plate, the film was scraped off from the glass plate with a knife, and then the length and width of the film were cut to 3cm with scissors to obtain the substrate layer.

[0060] Example 3

[0061] Preparation of substrate layer: Compared with Example 2, the only difference is that the amount of each raw material component of the substrate layer is different, and other conditions are exactly the same. Specifically, the amount of each raw material component of the substrate layer is:

[0062] 65g polyurethane, 8g glass fiber, 0.15g polydimethylsiloxane, 0.8g benzyl alcohol, 65g water, 12g modified boron nitride nanotubes prepared in Example 1, 18g flame retardant (6g melamine, 6g tributyl phosphate, 6g polysiloxane), 0.8g tetrahydrophthalic acid glycoside;

[0063] Finally, a substrate layer with a length and width of 3 cm was obtained.

[0064] Example 4

[0065] Preparation of substrate layer: Compared with Example 2, the only difference is that the amount of each raw material component of the substrate layer is different, and other conditions are exactly the same. Specifically, the amount of each raw material component of the substrate layer is:

[0066] 80g polyurethane, 10g glass fiber, 0.2g polydimethylsiloxane, 1g benzyl alcohol, 80g water, 15g modified boron nitride nanotubes prepared in Example 1, 20g flame retardant (7g melamine, 7g tributyl phosphate, 6g polysiloxane), 1g tetrahydrophthalic acid glycoside;

[0067] Finally, a substrate layer with a length and width of 3 cm was obtained.

[0068] Comparative Example 2

[0069] Preparation of substrate layer: Compared with Example 3, the only difference is that the modified boron nitride nanotubes prepared in Example 1 are replaced by the modified boron nitride nanotubes prepared in Comparative Example 1, and other conditions are exactly the same. Finally, a substrate layer with a length and width of 3 cm is prepared.

[0070] Comparative Example 3

[0071] Preparation of substrate layer: Compared with Example 3, the only difference is that the modified boron nitride nanotubes prepared in Example 1 are replaced by unmodified boron nitride nanotubes, and other conditions are exactly the same. Finally, a substrate layer with a length and width of 3 cm is prepared.

[0072] Comparative Example 4

[0073] Preparation of substrate layer: Compared with Example 3, the only difference is that the modified boron nitride nanotubes prepared in Example 1 are not added, and other conditions are exactly the same. Finally, a substrate layer with a length and width of 3 cm is prepared.

[0074] The performance test of the substrate layer prepared in Examples 2-4 and Comparative Examples 2-4 was carried out, and the test method was referred to the following method:

[0075] Thermal conductivity: measured using FM-3615 pulse width modulation thermal conductivity tester;

[0076] Heat release rate: measured using cone calorimeter (CONE);

[0077] Flame retardant grade (UL94): vertical burning test;

[0078] Tensile modulus: GB / 1447.

[0079] The test results are listed in Table 1, which is as follows:

[0080] Table 1

[0081]

[0082] By analyzing the data in Table 1, it can be seen that the substrate layers prepared in Examples 2-4 have lower thermal conductivity, higher heat release rate, and higher flame retardant grade than those in Comparative Examples 1-3, which indicates that the substrate layers in Examples 2-4 have better flame retardant and fireproof properties. At the same time, their tensile modulus is smaller, which indicates that they also have higher mechanical strength.

[0083] Specifically, compared with Examples 2-4, the modified boron nitride nanotubes in Comparative Example 2 do not contain sodium ether salts brought by hyaluronic acid modification, which indicates that the addition of the modified boron nitride nanotubes in the present invention can enhance the flame retardant and fireproof properties and mechanical strength of the substrate layer; compared with Comparative Example 2, the boron nitride nanotubes in Comparative Example 3 are not modified, which indicates that the addition of boron nitride nanotubes whose surfaces are modified with sodium hydroxymethyl cellulose can enhance the flame retardant and fireproof properties and mechanical strength of the substrate layer; compared with Comparative Example 3, the boron nitride nanotubes not added in Comparative Example 4 are not modified, which indicates that the addition of boron nitride nanotubes whose surfaces are modified with sodium hydroxymethyl cellulose can enhance the flame retardant and fireproof properties and mechanical strength of the substrate layer.

[0084] In summary, the modified boron nitride nanotubes added to the substrate layer of the present invention can enhance the flame retardant and fireproof properties combined with the mechanical strength of the substrate layer, thereby enabling the adhesive tape of the present invention to have better flame retardant and fireproof properties combined with mechanical strength.

[0085] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A fireproof tape for protecting a coil, comprising a substrate layer and an adhesive layer, characterized in that: The substrate layer comprises the following raw materials in parts by weight: 50-80 parts of polyurethane, 5-10 parts of glass fiber, 10-15 parts of modified boron nitride nanotubes, 15-20 parts of flame retardant, 0.5-1 parts of crosslinking agent, 0.1-0.2 parts of defoaming agent, 0.5-1 parts of auxiliary agent, 50-80 parts of water; The modified boron nitride nanotubes include boron nitride nanotubes, sodium hydroxymethyl cellulose and hyaluronic acid in a mass ratio of 5:6:

6.

2. The fireproof tape for protecting coils according to claim 1, characterized in that: The preparation method of the modified boron nitride nanotubes is: Step 1: dissolving boron nitride nanotubes in water to form solution A, dissolving hydroxymethyl cellulose in water to form solution B, mixing solution A and solution B evenly, adding acetic acid dropwise to adjust the pH to 4, and reacting at 60° C. for 2 hours to obtain a mixed solution; Step 2: Dissolve hyaluronic acid in water to form solution C, pour solution C into the mixed solution at room temperature, stir while pouring, continue stirring for 10 minutes after completion, then filter and wash the filter material with ethanol, vacuum dry the filter material, grind it into powder to obtain modified boron nitride nanotubes.

3. The fireproof tape for protecting coils according to claim 2, characterized in that: The mass fraction of boron nitride nanotubes in the solution A is 5-10%, the mass fraction of hydroxymethyl cellulose in the solution B is 20-25%, and the mass fraction of hyaluronic acid in the solution C is 20-25%.

4. The fireproof tape for protecting coils according to claim 2, characterized in that: The filter material is vacuum dried at a temperature of 80-100°C and a drying time of 12 hours.

5. The fireproof tape for protecting coils according to claim 1, characterized in that: The flame retardant is a composite flame retardant, including a nitrogen-based flame retardant, a phosphorus-based flame retardant, and a silicon-based flame retardant.

6. The fireproof tape for protecting coils according to claim 1, characterized in that: The cross-linking agent is any one of diisopropylbenzene peroxide, diethylenetriamine, tetrahydrophthalic acid glycoside and hexahydrophthalic anhydride.

7. The fireproof tape for protecting coils according to claim 1, characterized in that: The defoaming agent is one of polydimethylsiloxane or ethylene oxide.

8. The fireproof tape for protecting coils according to claim 1, characterized in that: The auxiliary agent is any one of benzyl alcohol, ethylene glycol butyl ether and propylene glycol methyl ether acetate.

9. The fireproof tape for protecting coils according to claim 1, characterized in that: The material of the adhesive layer is organic silica gel water.

10. A method for preparing a fireproof tape for protecting a coil according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: polyurethane, glass fiber, defoamer, additive, and water are sequentially added into a stirring tank and mixed evenly, and then modified boron nitride nanotubes, flame retardant, and cross-linking agent are sequentially added under stirring and stirred evenly to obtain a mixture, and the mixture is prepared into a film by a film making machine to obtain a substrate layer; S2: Evenly apply organic silica gel water on one side of the substrate layer, bake it at high temperature and then roll it into a material to obtain a fireproof tape for protecting the coil.

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