A heat-resistant heating and warning insulating tape and its preparation method

Abstract

The present invention relates to the technical field of insulating tapes, and specifically discloses a high-temperature-resistant heat warning insulating tape and a preparation method thereof. The preparation method comprises: surface treating a polyimide film and coating one side of the polyimide film with a temperature color-developing layer; mixing alumina, silicon dioxide, and urea, subjecting the mixture to high-speed ball milling and microwave treatment, and then modifying the mixture with a surfactant to obtain a modified filler; preparing a coating liquid comprising the following components: 40 parts of silicone rubber, 50-60 parts of silicone resin, 80-160 parts of solvent, 10-18 parts of modified filler, 1-2 parts of a cross-linking agent, and 0.1-0.5 parts of a catalyst; and uniformly coating the silicone pressure-sensitive adhesive coating liquid on the other side of the polyimide film to obtain an adhesive layer. The high-temperature-resistant heat warning insulating tape prepared by the present invention can provide a warning of high-temperature heat generation through the temperature color-developing layer, facilitating the timely detection of potential dangers. The heat resistance and viscosity of the insulating tape are improved by the modified filler. The preparation method is simple and easy to operate, and the raw materials are inexpensive and readily available.

Description

Technical Field

[0001] The present invention relates to the technical field of insulating tapes, and in particular to a high-temperature resistant heating warning insulating tape and a preparation method thereof. Background Art

[0002] Insulating tape is used for electrical insulation. Its main function is to prevent the risk of leakage and provide insulation protection. It is widely used in wrapping wire connection points, insulating electrical components, and insulating and repairing various types of resistor elements. For example, insulating tape provides indispensable insulation protection in wire joint wrapping, transformers, motors, capacitors, voltage stabilizers and other motors and electronic components. Insulating tape has excellent insulation pressure resistance and flame retardancy. However, there are some problems when using insulating tape: insulating tape needs to be wrapped in multiple layers when used. Multiple layers of winding can easily prevent the heat from dissipating and accumulate. If the heat is not dissipated in time, the temperature will rise. If the high temperature phenomenon is not discovered in time, it can easily cause electrical equipment or parts to melt due to high temperature, causing power outages and accidents.

[0003] Compared to traditional insulating tapes, thermochromic warning insulation tapes with multi-layer structures offer more functional advantages. For example, they can change color with temperature changes, providing a visual temperature warning effect. Chinese patent application publication number CN107151536 A discloses a heat-dissipating and temperature-displaying electrical insulating tape that can display temperature changes at the wrapping guard and has excellent heat dissipation and thermal conductivity. However, thermochromic warning insulation tapes still have shortcomings in terms of high-temperature resistance and adhesion, and need further improvement. Currently, most methods improve the high-temperature resistance of insulating tapes by adding thermally conductive and heat-resistant fillers. While high-temperature resistance improves with increasing filler content, adding too much thermally conductive and heat-resistant fillers can affect the adhesiveness of the insulating tape. Summary of the Invention

[0004] In view of the above shortcomings, the present invention provides a method for preparing a high-temperature resistant heating warning insulating tape. The prepared insulating tape has the characteristics of heating warning, high temperature resistance, good adhesion, etc. The specific technical solution is as follows:

[0005] A method for preparing a high-temperature resistant heating warning insulating tape, wherein the insulating tape has a multi-layer structure and comprises, from top to bottom, a temperature color developing layer, a polyimide matrix layer, and an adhesive layer. The preparation method comprises the following steps:

[0006] (1) Surface treatment of the polyimide film substrate is performed, and a temperature color developing layer is coated on one side of the polyimide film;

[0007] (2) Mix alumina, silica, and urea by high-speed ball milling at a weight ratio of 1:0.4 - 0.6:0.05 - 0.1, and then perform microwave treatment to obtain a mixed filler. Add the mixed filler into an ethanol solution to obtain a suspension. Add a surfactant to the suspension, perform ultrasonic oscillation, filter, and dry to obtain a modified filler.

[0008] (3) Prepare an organosilicon pressure-sensitive adhesive coating solution, which includes the following components by weight: 40 parts of organosilicon rubber, 50 - 60 parts of silicone resin, 80 - 160 parts of solvent, 10 - 18 parts of modified filler, 1 - 2 parts of crosslinking agent, and 0.1 - 0.3 parts of catalyst.

[0009] (4) Uniformly coat the organosilicon pressure-sensitive adhesive coating solution prepared in step (3) on the other side of the polyimide film obtained in step (1), and keep it warm in an oven at 140 - 160 °C for 4 - 6 min to obtain an adhesive layer, thus completing the preparation of the high-temperature resistant heat-generating warning insulating tape.

[0010] The working principle of the technical solution of the present invention is as follows: On the one hand, by setting a temperature color display layer on the surface of the substrate, it can warn of the high-temperature heat-generating phenomenon, which is beneficial to timely discover potential dangers. On the other hand, adding a modified filler to the organosilicon pressure-sensitive adhesive coating solution improves the heat dissipation and high-temperature resistance performance of the tape. Urea is used to modify the filler composed of alumina and silica. First, the three are subjected to high-speed ball milling, which not only makes the three evenly mixed, but more importantly, improves the reaction activity of each substance. Then, combined with microwave treatment, urea promotes nitrogen doping of alumina and silica, improving the thermal conductivity and heat resistance performance of the filler, thereby enhancing the heat dissipation and high-temperature resistance performance of the insulating tape. Further, a surfactant is used to perform surface modification on the mixed filler, enhancing the infiltration of the adhesive to the mixed filler, improving the combination of the mixed filler and the adhesive, improving the dispersibility and stability of the mixed filler in the adhesive, reducing the influence of the filler on the adhesiveness, and improving the adhesiveness of the insulating tape.

[0011] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, in step (2), the microwave treatment process parameters are: microwave power is 1000 - 1500 W, and the treatment time is 10 - 30 min.

[0012] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, in step (2), the ball milling speed is 1000 - 1500 rpm, and the ball milling time is 2 - 4 h.

[0013] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, the surfactant is composed of dodecylphenol polyoxyethylene ether, sodium stearate and silane coupling agent, and the mass ratio of dodecylphenol polyoxyethylene ether, sodium stearate and silane coupling agent is 1-2:1-2:3-5, and the addition amount of the surfactant is 3-8% of the mass of the mixed filler. The surfactant composed of the three of dodecylphenol polyoxyethylene ether, sodium stearate and silane coupling agent is used to modify the mixed filler, forming an organic-inorganic hybrid network structure, improving the dispersibility of the mixed filler in the glue and the combination of the mixed filler and the glue.

[0014] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, in the step (2), the ultrasonic oscillation power is 800-1000W, the ultrasonic oscillation time is 30min-60min, and the ultrasonic frequency is 30-50KHz.

[0015] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, in the step (3), the specific steps of preparing the organosilicon pressure-sensitive adhesive coating solution include:

[0016] S1. Mix 40 parts of organosilicon rubber, 50-60 parts of silicone resin, 0.1-0.3 parts of catalyst and 60-110 parts of solvent, and then stir and react at 95-105°C for 3-4h to obtain an organosilicon pressure-sensitive adhesive;

[0017] S2. Disperse 10-18 parts of modified filler into 10-30 parts of solvent to obtain a modified filler dispersion;

[0018] S3. Add 1-2 parts of cross-linking agent to 10-20 parts of solvent to dissolve, and prepare a cross-linking agent solution;

[0019] S4. Add the modified filler dispersion obtained in step S2 and the cross-linking agent solution obtained in step S3 to the organosilicon pressure-sensitive adhesive obtained in step S1, and stir and mix at high speed to obtain an organosilicon pressure-sensitive adhesive coating solution.

[0020] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, the cross-linking agent is dibenzoyl peroxide, and the catalyst is dibutyltin dilaurate.

[0021] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, the organosilicon rubber is hydroxyl-terminated silicone rubber with a molecular weight of 100,000-300,000; the silicone resin is MQ silicone resin with a molecular weight of 3000-6000.

[0022] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, the particle size of the alumina is 300-800nm, and the particle size of the silica is 20-35nm.

[0023] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, the thickness of the polyimide film is 15-30 μm, the thickness of the adhesive layer is 10-30 μm, and the surface treatment is corona treatment or plasma surface treatment.

[0024] Preferably, in the preparation method of the above-mentioned high-temperature resistant heat-generating warning insulating tape, the preparation of the temperature color-developing layer includes: mixing a thermochromic powder, a binder, and a dispersant to prepare a temperature color-developing slurry, coating the temperature color-developing slurry on the surface of the polyimide film, and curing to obtain the temperature color-developing layer.

[0025] On the other hand, the present invention also provides a high-temperature resistant heat-generating warning insulating tape, which is prepared by the above-mentioned preparation method.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. The high-temperature resistant heat-generating warning insulating tape prepared by the present invention can warn of high-temperature heat-generating phenomena through the temperature color-developing layer, which is beneficial to timely discovery of potential dangers. The heat resistance and viscosity of the insulating tape are improved by modified fillers, and it also has good chemical corrosion resistance. The preparation method is simple and easy to operate, and the raw materials are cheap and easily available.

[0028] 2. In the preparation method of the high-temperature resistant heat-generating warning insulating tape of the present invention, urea combined with high-speed ball milling and microwave treatment is used to modify the filler composed of alumina and silica, improving the thermal conductivity and heat resistance of the filler, thereby enhancing the heat resistance of the insulating tape. Further, a surfactant is used to perform surface modification on the mixed filler to form an organic-inorganic hybrid network structure, enhancing the infiltration of the glue into the mixed filler, improving the combination of the mixed filler and the glue, reducing the influence of the filler on the adhesiveness of the glue, and improving the adhesiveness of the insulating tape. Specific Embodiments

[0029] The specific embodiments of the present invention will be described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments. Unless otherwise defined, all professional terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention. Unless otherwise specifically stated, all raw materials, reagents, instruments, and equipment used in the present invention can be obtained through market purchase or can be prepared by existing methods.

[0030] Example 1

[0031] A high-temperature resistant heat-generating warning insulating tape, the insulating tape is a multi-layer structure, and sequentially includes a temperature display layer, a polyimide matrix layer, and an adhesive layer from top to bottom, and the adhesive layer is an organosilicon pressure-sensitive adhesive layer.

[0032] A preparation method of a high-temperature resistant heat-generating warning insulating tape, comprising the following steps:

[0033] (1) Prepare modified filler: Mix alumina (D50 = 0.8μm), silica (D50 = 20nm), and urea according to a weight ratio of 1:0.5:0.08, ball mill for 3h at a ball mill speed of 1200rpm, and then treat with a microwave power of 1200W for 20min to obtain a mixed filler; add the mixed filler to an ethanol aqueous solution with a volume concentration of 80% to obtain a suspension, and the weight ratio of the mixed filler to the ethanol aqueous solution is 1:10. Add a surfactant composed of dodecylphenol polyoxyethylene ether, sodium stearate, and γ-aminopropyltriethoxysilane to the suspension. The mass ratio of dodecylphenol polyoxyethylene ether, sodium stearate, and γ-aminopropyltriethoxysilane is 1.5:1.5:4, and the addition amount of the surfactant is 5% of the mass of the mixed filler. Perform ultrasonic oscillation, the ultrasonic oscillation power is 1000W, the ultrasonic oscillation time is 1h, the ultrasonic frequency is 40KHz, filter, and place in a vacuum drying oven at 80°C for vacuum drying to obtain the modified filler;

[0034] (2) Prepare an organosilicon pressure-sensitive adhesive coating solution: The organosilicon pressure-sensitive adhesive coating solution comprises the following components by weight: 40 parts of organosilicon rubber (107 silicone rubber with a molecular weight of 200,000), 55 parts of MQ silicone resin (molecular weight of 4000), 120 parts of xylene, 14 parts of modified filler, 1.5 parts of dibenzoyl peroxide, and 0.2 parts of dibutyltin dilaurate;

[0035] (3) Perform corona treatment on both sides of a polyimide film substrate with a thickness of 25μm. Coat a temperature display slurry on one side of the polyimide film. The slurry is mainly composed of a thermochromic powder and a binder. The thermochromic powder can select different temperature-sensitive thermochromic powders according to the use scenario, or a multi-layer structure can be set with reference to the prior art to display different temperature ranges. The specific composition of the temperature display slurry in this embodiment by weight is: 50 parts of high-temperature resistant epoxy resin, 3 parts of thermochromic powder, 5 parts of amine curing agent, 0.6 part of BYK-110 dispersant, and 20 parts of xylene. Add the thermochromic powder to xylene and perform ultrasonic dispersion evenly, then add the dispersant and epoxy resin and grind and disperse evenly, and finally add the curing agent and stir evenly to obtain the temperature display slurry. Coat the temperature display slurry evenly on one side of the polyimide film, and then cure at 100°C for 2h to obtain the temperature display layer, and the thickness of the temperature display layer is 25μm;

[0036] (4) Coating the silicone pressure-sensitive adhesive coating solution prepared in step (2) evenly on the other side of the polyimide film obtained in step (3), and keeping it warm in an oven at 150 °C for 5 min to obtain an adhesive layer with a thickness of 22 μm, thus completing the preparation of the high-temperature resistant heat-generating warning insulating tape.

[0037] The specific steps for preparing the silicone pressure-sensitive adhesive coating solution include:

[0038] S1. Mix 40 parts of silicone rubber, 55 parts of silicone resin, 0.2 part of dibutyltin dilaurate, and 80 parts of xylene, and then stir and react at 100 °C for 4 h to obtain a silicone pressure-sensitive adhesive;

[0039] S2. Ultrasonically disperse 14 parts of modified filler evenly into 25 parts of xylene to obtain a modified filler dispersion;

[0040] S3. Dissolve 1.5 parts of benzoyl peroxide in 15 parts of xylene to prepare a benzoyl peroxide solution;

[0041] S4. Add the modified filler dispersion obtained in step S2 and the benzoyl peroxide solution obtained in step S3 to the silicone pressure-sensitive adhesive obtained in step S1, stir and mix evenly at a high speed, stir at a speed of 1500 r / min for 2 h to obtain a silicone pressure-sensitive adhesive coating solution.

[0042] Example 2

[0043] A high-temperature resistant heat-generating warning insulating tape, the insulating tape is a multi-layer structure, and successively includes a temperature color display layer, a polyimide matrix layer, and an adhesive layer from top to bottom, and the adhesive layer is a silicone pressure-sensitive adhesive layer.

[0044] A preparation method of a high-temperature resistant heat-generating warning insulating tape, comprising the following steps:

[0045] (1) Prepare a modified filler: Mix alumina (D50 = 0.8 μm), silica (D50 = 20 nm), and urea in a weight ratio of 1:0.4:0.05, ball mill at a ball mill speed of 1300 rpm for 2.5 h, and then treat at a microwave power of 1000 W for 30 min to obtain a mixed filler; add the mixed filler to an ethanol aqueous solution with a volume concentration of 80% to obtain a suspension, the weight ratio of the mixed filler to the ethanol aqueous solution is 1:10, add a surfactant composed of dodecylphenol polyoxyethylene ether, sodium stearate, and γ-aminopropyltriethoxysilane to the suspension, the mass ratio of dodecylphenol polyoxyethylene ether, sodium stearate, and γ-aminopropyltriethoxysilane is 1:1.8:5, the addition amount of the surfactant is 5% of the mass of the mixed filler, perform ultrasonic oscillation, the ultrasonic oscillation power is 1000 W, the ultrasonic oscillation time is 1 h, the ultrasonic frequency is 40 KHz, filter, and place it in a vacuum drying oven at 80 °C for vacuum drying to obtain a modified filler;

[0046] (2) Prepare the silicone pressure-sensitive adhesive coating solution: The silicone pressure-sensitive adhesive coating solution includes the following components by weight: 40 parts of silicone rubber (107 silicone rubber with a molecular weight of 200,000), 50 parts of MQ silicone resin (with a molecular weight of 4000), 120 parts of xylene, 15 parts of modified filler, 1.5 parts of dibenzoyl peroxide, and 0.18 part of dibutyltin dilaurate;

[0047] (3) Perform corona treatment on both sides of a 25-μm-thick polyimide film substrate. Coat a temperature-sensitive color-developing slurry on one side of the polyimide film. The slurry is mainly composed of a thermosensitive color-changing powder and a binder. The thermosensitive color-changing powder can be selected according to different usage scenarios, and different temperature-sensitive color-developing powders can be used, or a multi-layer structure can be set to display different temperature ranges. The specific composition of the temperature-sensitive color-developing slurry in this example by weight is: 50 parts of epoxy resin, 3 parts of thermosensitive color-changing powder, 5 parts of curing agent, 0.6 part of BYK-110 dispersant, and 20 parts of xylene. Add the thermosensitive color-changing powder to xylene and disperse it evenly by ultrasonic, then add the dispersant and epoxy resin and grind and disperse them evenly, and finally add the curing agent and stir evenly to obtain the temperature-sensitive color-developing slurry. Coat the temperature-sensitive color-developing slurry evenly on one side of the polyimide film, and then cure it at 100°C for 2 h to obtain a temperature-sensitive color-developing layer with a thickness of 25 μm;

[0048] (4) Uniformly coat the silicone pressure-sensitive adhesive prepared in step (2) on the other side of the polyimide film obtained in step (3), and keep it warm in an oven at 150°C for 5 min to obtain an adhesive layer with a thickness of 22 μm, completing the preparation of the high-temperature resistant heat-generating warning insulating tape.

[0049] The specific steps for preparing the silicone pressure-sensitive adhesive coating solution include:

[0050] S1. Mix 40 parts of silicone rubber, 50 parts of silicone resin, 0.18 part of dibutyltin dilaurate, and 80 parts of xylene, and then stir and react at 100°C for 4 h to obtain a silicone pressure-sensitive adhesive;

[0051] S2. Ultrasonically disperse 15 parts of modified filler evenly into 25 parts of xylene to obtain a modified filler dispersion;

[0052] S3. Dissolve 1.5 parts of dibenzoyl peroxide in 15 parts of xylene to prepare a dibenzoyl peroxide solution;

[0053] S4. Add the modified filler dispersion obtained in step S2 and the dibenzoyl peroxide solution obtained in step S3 to the silicone pressure-sensitive adhesive obtained in step S1, stir and mix evenly at a high speed, and stir at a speed of 1500 r / min for 2 h to obtain the silicone pressure-sensitive adhesive coating solution.

[0054] Comparative Example 1

[0055] This comparative example is different from Example 1 in that: in step (1), urea is not added, and the others are the same as in Example 1.

[0056] Comparative Example 2

[0057] This comparative example is different from Example 1 in that: in step (1), ball milling is carried out at a ball milling speed of 400 rpm for 5 h, and the others are the same as in Example 1.

[0058] Comparative Example 3

[0059] This comparative example is different from Example 1 in that: in step (1), the microwave is treated with a microwave power of 700 W for 60 min, and the others are the same as in Example 1.

[0060] Comparative Example 4

[0061] This comparative example is different from Example 1 in that: in step (1), the surfactant is γ-aminopropyltriethoxysilane, and the others are the same as in Example 1.

[0062] The performance of the insulating tapes in the examples and comparative examples was tested:

[0063] 180° peel strength: The 180° peel strength of the insulating tapes in the examples and comparative examples from the stainless steel plate was tested according to Method 1 in the standard GB / T 2792-2014, and the peeling speed was 300 mm / min;

[0064] Initial tack: The initial tack performance of the insulating tape was tested according to Method A in the standard GB / T 4852-2002;

[0065] High-temperature holding tack performance: The holding tack strength was tested with reference to the standard GB / T 4851-1998. The polyimide tape was pasted on the stainless steel plate with an area of 25×25 mm 2 and rolled back and forth 3 times with a 2 kg pressure roller. After standing for 20 min, the polyimide tape was subjected to a shearing force of 500 g, and the time required for the polyimide tape to fall off the stainless steel plate was measured in an oven at 280°C.

[0066] Test of high-temperature resistance: The high-temperature performance was tested according to the method in the standard GB / T 2423.2-2008. The temperature was set at 240°C, the exposure time was 30 min, and then it was taken out and the 180° peel strength was tested.

[0067] Table 1 shows the performance data of the insulating tapes in each group. It can be seen from the table that the insulating tape prepared by the present invention has high peel strength and high temperature resistance, and good initial tack and high temperature holding tack. There is no obvious difference in the peel strength at room temperature between Comparative Example 1 and Example 1. However, after the high temperature resistance test, the peel strength retention rate of Example 1 is 96.2%, and that of Comparative Example 1 is 87.6%. The peel strength of Comparative Example 1 decreases significantly after the high temperature test, indicating that the modification of the mixed filler with urea can significantly improve the heat resistance of the insulating tape. Comparing Example 1 with Comparative Examples 2-3, it can be seen that the ball milling parameters and microwave parameters will affect the modification effect of urea on the mixed filler, thereby affecting the high temperature performance of the insulating tape. Comparing the performance data of Example 1 and Comparative Example 4, it can be known that the surface modification of the mixed filler with a surfactant composed of the composite of dodecylphenol polyoxyethylene ether, sodium stearate and γ-aminopropyltriethoxysilane is more conducive to improving the bonding between the mixed filler and the glue, and improving the viscosity and high temperature resistance of the tape.

[0068] Table 1 Performance Data of Insulating Tapes in Each Group

[0069]

[0070] The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the present invention, as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A preparation method of a high-temperature resistant heat-generating warning insulating tape, characterized in that, The insulating tape is a multi-layer structure, which sequentially includes a temperature indicating layer, a polyimide matrix layer, and an adhesive layer from top to bottom. The preparation method includes the following steps: (1) Surface-treat the polyimide film substrate, and coat a temperature indicating layer on one side of the polyimide film; (2) Mix alumina, silica, and urea according to a weight ratio of 1:0.4 - 0.6:0.05 - 0.1, and perform high-speed ball milling. The ball milling speed is 1000 - 1500 rpm, and the ball milling time is 2 - 4 h; then perform microwave treatment. The microwave treatment process parameters are: the microwave power is 1000 - 1500 W, and the treatment time is 10 - 30 min; obtain a mixed filler; add the mixed filler into an ethanol solution to mix and obtain a suspension, and add a surfactant to the suspension. The surfactant consists of dodecylphenol polyoxyethylene ether, sodium stearate, and a silane coupling agent. The mass ratio of dodecylphenol polyoxyethylene ether, sodium stearate, and the silane coupling agent is 1 - 2:1 - 2:3 - 5, and the addition amount of the surfactant is 3 - 8% of the mass of the mixed filler; perform ultrasonic oscillation, filtration, and drying to obtain a modified filler; (3) Prepare an organosilicon pressure-sensitive adhesive coating solution. The organosilicon pressure-sensitive adhesive coating solution includes the following components by weight: 40 parts of organosilicon rubber, 50 - 60 parts of silicone resin, 80 - 160 parts of solvent, 10 - 18 parts of modified filler, 1 - 2 parts of crosslinking agent, and 0.1 - 0.3 parts of catalyst; (4) Uniformly coat the organosilicon pressure-sensitive adhesive coating solution prepared in step (3) on the other side of the polyimide film obtained in step (1), and keep it warm in an oven at 140 - 160 °C for 4 - 6 min to obtain an adhesive layer, thus completing the preparation of the high-temperature resistant heat-generating warning insulating tape.

2. The preparation method of the high-temperature resistant heat-generating warning insulating tape according to claim 1, characterized in that, In step (2), the ultrasonic oscillation power is 800 - 1000 W, the ultrasonic oscillation time is 1 h - 2 h, and the ultrasonic frequency is 30 - 50 KHz.

3. The preparation method of the high-temperature resistant heat-generating warning insulating tape according to claim 1, characterized in that, In step (3), the specific steps for preparing the organosilicon pressure-sensitive adhesive coating solution include: S1. Mix 40 parts of organosilicon rubber, 50 - 60 parts of silicone resin, 0.1 - 0.3 parts of catalyst, and 60 - 110 parts of solvent, and then stir and react at 95 - 105 °C for 3 - 4 h to obtain an organosilicon pressure-sensitive adhesive; S2. Disperse 10 - 18 parts of modified filler into 10 - 30 parts of solvent to obtain a modified filler dispersion; S3. Add 1 - 2 parts of crosslinking agent into 10 - 20 parts of solvent to dissolve and prepare a crosslinking agent solution; S4. Add the modified filler dispersion obtained in step S2 and the crosslinking agent solution in step S3 into the organosilicon pressure-sensitive adhesive obtained in step (1), and stir and mix at high speed to obtain an organosilicon pressure-sensitive adhesive coating solution.

4. The preparation method of the high-temperature resistant heat-generating warning insulating tape according to claim 1, characterized in that, The crosslinking agent is dibenzoyl peroxide, and the catalyst is dibutyltin dilaurate.

5. The preparation method of the high-temperature resistant heat-generating warning insulating tape according to claim 1, characterized in that, The thickness of the polyimide film is 15 - 30 μm, the thickness of the adhesive layer is 10 - 30 μm, and the surface treatment is corona treatment or plasma surface treatment.

6. The preparation method of the high-temperature resistant heat-generating warning insulating tape according to claim 1, characterized in that, The preparation of the temperature color display layer includes: mixing a temperature-sensitive color-changing powder, a binder, and a dispersant to prepare a temperature color display slurry, coating the temperature color display slurry on the surface of a polyimide film, and curing to obtain the temperature color display layer.

7. A high-temperature resistant heating and warning insulating tape, characterized in that, The insulating tape is prepared by the preparation method according to any one of claims 1 to 6.

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