Insulating single-winding fireproof composite belt resistant to high pressure and high temperature as well as preparation method and application of insulating single-winding fireproof composite belt

Abstract

The invention discloses a high-pressure-resistant and high-temperature-resistant insulating single-winding fireproof composite belt as well as a preparation method and application thereof. The high-pressure-resistant and high-temperature-resistant insulating single-winding fireproof composite belt comprises a double-sided adhesive layer, a fireproof layer, a glass fiber layer and a fireproof stripping layer which are sequentially stacked. According to the high-pressure-resistant and high-temperature-resistant insulating single-winding fireproof composite belt provided by the invention, the overall hardness is reduced and the flexibility is improved through the low-hardness fireproof layer, and the composite belt is attached without wrinkles during winding; a stripping auxiliary agent is added into the fireproof stripping layer, so that the double-faced adhesive tape layer and the fireproof stripping layer are directly attached and rolled and subsequently unrolled without damage; the double-sided adhesive layer is designed to be strong and weak in viscosity, the high-viscosity surface is stably combined with the fireproof layer, the low-viscosity surface is convenient to unwind and separate and has no residual adhesive during reworking, and the requirements of automation and reworking are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fireproof composite tape, in particular to a high-pressure and high-temperature resistant insulation single-receiving fireproof composite tape and a preparation method and application thereof. BACKGROUND

[0002] In recent years, with the continuous improvement of the energy density of lithium-ion power batteries, although the battery life has been effectively extended, the risk of thermal runaway of the battery under extreme conditions such as overcharging, short circuit, high temperature, impact and the like has significantly increased, and safety accidents such as spontaneous combustion and explosion have occurred frequently. When the power battery is in thermal runaway, a large number of metal conductive parts such as copper bars and aluminum bars are exposed inside the vehicle body, which not only easily causes structural damage due to high temperature, but also can conduct current and voltage, causing serious electric shock risk to the people inside the vehicle, and also causing a series of serious consequences such as burning of the vehicle and property loss. Therefore, developing a material that can adapt to metal parts such as copper bars and aluminum bars, has excellent high-pressure and high-temperature resistance, insulation and fireproof performance, and can realize automatic coating has become a key technical problem to be solved in the new energy vehicle industry.

[0003] In the prior art, CN116004129A discloses a power battery fireproof high-temperature insulation ceramic composite tape and its preparation and application. The ceramic composite tape has the flexibility of silicone at room temperature, and the thickness is controlled in the ultra-thin range of 0.15-0.5 mm, which ensures that it can be wound on the battery assembly without being easily warped. However, in actual application, when facing the complex irregular shape of the metal parts inside the vehicle, the composite tape is prone to wrinkling during winding, making it difficult to achieve close fitting. At the same time, during the single-receiving (single-winding) process, the double-sided tape is prone to reverse sticking, which causes slight damage to the fireproof layer and affects the overall performance stability.

[0004] CN218665889U discloses a new energy battery adhesive tape. The adhesive tape body includes an adhesive layer, the lower surface of the adhesive layer is provided with a release film layer, and the top is sequentially provided with a high-temperature resistant layer, a flame-retardant layer, an insulating layer, a protective layer and a wear-resistant layer. This scheme avoids the sticking problem of the adhesive layer during storage and transportation by setting the release film layer, but during actual coating operation, the release film needs to be manually peeled off, which cannot meet the demand for automatic coating of metal parts in the production process of new energy vehicles, seriously affecting the production efficiency and making it difficult to meet the requirements of large-scale industrial production.

[0005] CN222097208U discloses a battery pack fireproof mica tape, which adopts the structure of first mica tape layer, second mica tape layer and double-sided adhesive tape in between, and sets heat dissipation holes on the surface of the mica tape. The first mica tape layer and the second mica tape layer are both mica tape, which is composed of mica paper and glass fiber cloth by epoxy resin. However, the mica tape and glass fiber cloth composite material used in this structure has high hardness, which is easy to cause warping when wrapping metal parts, and needs to use additional adhesive tape for strong fixation, which not only increases the material cost of the user, but also increases the operation process, further reduces the production efficiency, and cannot meet the efficient and low-cost automatic production demand.

[0006] In summary, the existing fireproof insulating material for power battery metal part wrapping still has obvious deficiencies in aspects such as adapting to irregular shape metal part wrapping, avoiding single collection and reverse sticking, preventing fireproof layer damage, reducing use cost and simplifying operation process, and cannot meet the urgent demand of new energy automobile industry for high safety, high adaptability and high efficiency material. Therefore, it has important practical significance and broad application prospect to develop a composite tape which can effectively solve the above technical problems, has high pressure and high temperature resistance, insulation, fireproof performance, can realize automatic wrapping of irregular metal parts, has no risk of reverse sticking during single collection, is convenient to use and cost controllable. SUMMARY

[0007] To solve the above technical problems, the present application provides a high pressure and high temperature resistant insulation single collection fireproof composite tape and its preparation method and application.

[0008] The present application is realized by the following technical solutions:

[0009] The present application provides a high pressure and high temperature resistant insulation single collection fireproof composite tape in the first aspect, which comprises a double-sided adhesive layer, a fireproof layer, a glass fiber layer and a fireproof peeling layer arranged in sequence.

[0010] The double-sided adhesive layer comprises a low-adhesion acrylic adhesive layer, a PET layer and a high-adhesion acrylic adhesive layer, and the high-adhesion acrylic adhesive layer is close to the fireproof layer. One side of the high-adhesion acrylic adhesive layer in the double-sided adhesive layer is a high-adhesion side, and the 180° peeling force between the high-adhesion side and the fireproof layer is 8-12 N / cm. The other side of the low-adhesion acrylic adhesive layer in the double-sided adhesive layer is a low-adhesion side, and the 180° peeling force between the low-adhesion side and the fireproof peeling layer is 4-7 N / cm.

[0011] The fireproof layer is formed by curing an organosilicon composition, which comprises, by weight percentage: 27-40% organosilicon, 0.5-3% curing agent, 0.01-0.5% reaction aid, 20-30% flame-retardant filler, and 30-40% inorganic ceramic filler; the organosilicon is selected from one or more of vinyl-terminated polydimethylsiloxane, divinyl-terminated phenylmethylsiloxane, methyl vinyl MQ silicone resin, and methyl-terminated polymethyl vinyl siloxane. The mixture comprises polymethylhydrosiloxane and hydrogen-terminated polydimethylsiloxane; the curing agent includes low-hydrogen-content side-chain hydrogen-containing silicone oil and high-hydrogen-content side-chain hydrogen-containing silicone oil, wherein the low-hydrogen-content side-chain hydrogen-containing silicone oil has a hydrogen content of 0.18-0.75%, the high-hydrogen-content side-chain hydrogen-containing silicone oil has a hydrogen content of 1.0-1.6%, and the mass ratio of the low-hydrogen-content side-chain hydrogen-containing silicone oil to the high-hydrogen-content side-chain hydrogen-containing silicone oil is (8-9):(1-2); the reaction aids include alkynol inhibitors and Pt catalysts;

[0012] The fire-retardant release layer is formed by curing an organosilicon release composition, which comprises an organosilicon composition and a release aid. The organosilicon release composition contains, by weight percentage: 27-40% organosilicon, 0.5-3% curing agent, 0.01-0.5% reaction aid, 20-30% flame-retardant filler, 30-40% inorganic ceramic filler, and 0.3-1.0% release aid. The organosilicon is selected from one or more of vinyl-terminated polydimethylsiloxane, divinyl-terminated phenylmethylsiloxane, methyl vinyl MQ silicone resin, and methyl-terminated polymethyl vinyl siloxane, as well as polymethyl hydrosiloxane. The mixture comprises alkyl and hydrogen-terminated polydimethylsiloxane; the curing agent includes low-hydrogen-content side-chain hydrogen-containing silicone oil and high-hydrogen-content side-chain hydrogen-containing silicone oil, wherein the low-hydrogen-content side-chain hydrogen-containing silicone oil has a hydrogen content of 0.18-0.75%, the high-hydrogen-content side-chain hydrogen-containing silicone oil has a hydrogen content of 1.0-1.6%, and the mass ratio of the low-hydrogen-content side-chain hydrogen-containing silicone oil to the high-hydrogen-content side-chain hydrogen-containing silicone oil is (8-9):(1-2); the reaction aid includes alkynyl alcohol inhibitor and Pt catalyst; the stripping aid includes γ-methacryloyloxypropyltrimethoxysilane and organosilicon stripping agent, wherein the active ingredient of the organosilicon stripping agent is a vinylsiloxane functional polymer.

[0013] In this invention, "single winding" refers to a method in which, during the winding process of the composite tape, no release film, release paper, or any other release material is used to isolate the adhesive surface of the tape. Instead, the adhesive surface of the tape is made to directly contact the surface of the fire-retardant release layer on the other side of the composite tape, and the winding is completed in this state.

[0014] This invention relates to a high-pressure, high-temperature resistant, insulating single-wrap fireproof composite tape. By designing the fireproof layer to have low hardness, the overall hardness of the product is effectively reduced, while imparting excellent flexibility. This allows it to adhere tightly to the wound component during winding, preventing wrinkles and curling. Simultaneously, by introducing a release agent into the fireproof release layer, the fireproof composite tape achieves direct adhesion between the double-sided adhesive layer and the fireproof release layer, and facilitates subsequent unwinding and separation, even in a relatively soft state. Furthermore, the double-sided adhesive layer employs a unique strong-weak adhesion structure design. The high-adhesion side ensures a stable bond with the fireproof layer, while the low-adhesion side facilitates the unwinding and separation of the fireproof release layer and the double-sided adhesive layer. No adhesive residue is left during rework, thus meeting the market's new demands for automated production and reworkability.

[0015] Furthermore, the thickness of the double-sided adhesive layer is 0.03-0.10 mm, for example, it can be 0.03 mm, 0.05 mm, 0.07 mm, 0.10 mm, or a range formed by any two values.

[0016] Furthermore, the thickness of the low-viscosity acrylic adhesive layer is 0.008-0.03 mm, the thickness of the PET layer is 0.012-0.036 mm, and the thickness of the high-viscosity acrylic adhesive layer is 0.01-0.035 mm.

[0017] In a specific embodiment, the low-tack acrylic adhesive layer is a low-tack acrylic pressure-sensitive adhesive, and the high-tack acrylic adhesive layer is a high-tack acrylic pressure-sensitive adhesive.

[0018] Furthermore, the thickness of the fireproof layer is 0.03-0.10 mm, for example, it can be 0.03 mm, 0.05 mm, 0.08 mm, 0.10 mm, or a range formed by any two values.

[0019] Furthermore, the fireproof layer is made of an organic silicone layer mixed with ceramicized composite filler.

[0020] Furthermore, the thickness of the glass fiber layer is 0.03-0.20 mm, for example, it can be 0.03 mm, 0.08 mm, 0.13 mm, 0.18 mm, or a range formed by any two values.

[0021] Furthermore, the glass fiber layer is made of glass fiber.

[0022] Furthermore, the thickness of the fireproof peeling layer is 0.03-0.10 mm, for example, it can be 0.03 mm, 0.05 mm, 0.08 mm, 0.10 mm, or any two values ​​within a range.

[0023] Furthermore, the fireproof release layer is made of an organic silicone layer mixed with ceramic composite filler and release agent.

[0024] Furthermore, the thickness of the insulating single-layer fireproof composite tape is 0.20-0.40 mm, for example, it can be 0.20 mm, 0.25 mm, 0.30 mm, 0.35 mm, 0.40 mm, or any two values ​​within a range.

[0025] Furthermore, the viscosity of the vinyl-terminated polydimethylsiloxane is 1000-5000 mPa·s, and the vinyl content is 0.2-1.0 wt%.

[0026] In a specific embodiment, the vinyl-terminated polydimethylsiloxane is a vinyl-terminated polydimethylsiloxane with a branched structure (such as DY-V411 from Shandong Dayi).

[0027] Furthermore, the vinyl content in the divinyl-terminated phenylmethylsiloxane is 0.3-0.8 wt%, and the phenyl content is 5-15 wt%.

[0028] Furthermore, the viscosity of the methyl vinyl MQ silicone resin is 12000-20000 mPa·s, the vinyl content is 1.2-1.3 wt%, and the M / Q ratio is 0.6-1.0.

[0029] Furthermore, the vinyl content in the methyl-terminated polymethylvinylsiloxane is 0.1-0.5 wt%.

[0030] Furthermore, the viscosity of the polymethylhydrosiloxane (with hydrogen in the side chain) is 20-500 mPa·s, and the hydrogen content is 0.18-1.6 wt%.

[0031] Furthermore, the hydrogen content in the hydrogen-terminated polydimethylsiloxane is 0.03-0.40 wt%.

[0032] Preferably, the silicone is vinyl-terminated polydimethylsiloxane, methyl vinyl MQ silicone resin, polymethylhydrosiloxane, and hydrogen-terminated polydimethylsiloxane.

[0033] Further, the mass ratio of the vinyl-terminated polydimethylsiloxane, methyl vinyl MQ silicone resin, polymethylhydrosiloxane, and hydrogen-terminated polydimethylsiloxane is (8.4-9.5):(0.01-0.5):(0.03-1.0):(0.01-0.5), for example, it can be 8.4:0.5:1.0:0.1, 9.0:0.2:0.5:0.3, 9.5:0.05:0.35:0.1, or any two ratios forming a range, preferably (8.1-9.1):(0.01-0.02):(0.08-0.09):(0.04-0.05).

[0034] Furthermore, the mass ratio of the low-hydrogen-content side-chain type hydrogen-containing silicone oil to the high-hydrogen-content side-chain type hydrogen-containing silicone oil is (8-9):(1-2), for example, it can be 8:2, 8.5:1.5, 9:1, or any range of two ratios.

[0035] Furthermore, the curing agent also includes one or more of methyl hydrogen MQ type silicone resin, bis(2,4-dichlorobenzoyl) peroxide and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.

[0036] Furthermore, the hydrogen content in the methyl hydrogen-containing MQ type silicone resin is 0.5-1.5 wt%, and the M / Q ratio is 0.6-1.0.

[0037] Further, the alkynol inhibitor is ethynylcyclohexanol (ECH) and / or 2-methyl-3-butyn-2-ol (MBEA); the Pt catalyst is a caster platinum catalyst; the mass ratio of the inhibitor to the Pt catalyst is 1:(3-20).

[0038] Furthermore, the Pt content in the Pt catalyst is 1000-3000 ppm.

[0039] Furthermore, the flame-retardant filler is selected from one or more of aluminum hydroxide, magnesium hydroxide, benzotriazole and carbon black, preferably aluminum hydroxide and benzotriazole.

[0040] Further, the mass ratio of aluminum hydroxide to benzotriazole is (97-99.5):(0.5-3), for example, it can be 97:3, 98:2, 99:1, 99.5:0.5, or any two ratios within a range.

[0041] Furthermore, the aluminum hydroxide has a D50 particle size ≤ 10 μm and a D90 particle size ≤ 50 μm.

[0042] Furthermore, the inorganic ceramic filler is selected from one or more of the following: silazane-treated fumed silica, silica powder, borax, boric acid, lithium carbonate, sodium carbonate, sodium nitrate, kaolin, wollastonite, mica powder, fluorite, clay, glass powder, zinc borate, diatomaceous earth, zinc oxide, aluminum oxide, and magnesium oxide.

[0043] Furthermore, the silazane is hexamethyldisilazane (HMDS) or diphenyldisilazane (DPDS).

[0044] Furthermore, the specific surface area of ​​the silazane-treated fumed silica is 100-250 m². 2 / g.

[0045] Furthermore, the D50 particle size of the silica powder, kaolin, wollastonite, mica powder, clay, glass powder, zinc borate, and diatomaceous earth is ≤10 μm, and the D90 particle size is ≤50 μm; the D50 particle size of the borax, boric acid, lithium carbonate, sodium carbonate, sodium nitrate, zinc oxide, aluminum oxide, and magnesium oxide is ≤10 μm; and the D50 particle size of the fluorite is 5-20 μm.

[0046] Preferably, the inorganic ceramic filler includes at least silazane-treated fumed silica, zinc borate, mica powder, and kaolin.

[0047] Furthermore, the mass ratio of the silazane-treated fumed silica, zinc borate, mica powder, and kaolin is (5-20):(4-12):(10-40):(15-50), for example, it can be 8:12:40:40, 10:10:30:50, 20:8:30:42, 20:5:30:45, or any two of these ratios forming a range.

[0048] Preferably, the mass ratio of γ-methacryloxypropyltrimethoxysilane to the organosilicon stripper is (1-2):(0.5-1), for example, it can be 1:0.5, 1.5:0.7, 2:0.8, 2:1, or any range of two ratios.

[0049] In a specific embodiment, the silicone stripping agent is SYL-OFF manufactured by Dow Chemical. TM Series of products (e.g., SYL-OFF) TM 7678), whose active ingredient is a vinylsiloxane functional polymer.

[0050] Furthermore, the stripping agent also includes dodecyltrimethoxysilane.

[0051] The second aspect of this invention provides a method for preparing the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape described in the first aspect, comprising the following steps:

[0052] (1) Add organosilicon, inorganic ceramic filler, flame retardant filler, curing agent, alkynol inhibitor and Pt catalyst into a mixer and mix evenly to obtain organosilicon composition;

[0053] (2) At 80-100 ℃, add silicone, inorganic ceramic filler, release agent and flame retardant filler into a mixer, mix evenly and then cool down to below 40 ℃, add curing agent, alkynol inhibitor and Pt catalyst, mix evenly to obtain silicone release composition.

[0054] (3) Using glass fiber as a substrate, the silicone composition obtained in step (1) is coated on one side of the substrate to form a fireproof layer; the silicone release composition obtained in step (2) is coated on the other side of the glass fiber to form a fireproof release layer; a double-sided adhesive layer is attached to the side of the fireproof layer away from the glass fiber, and the high-viscosity acrylic adhesive layer of the double-sided adhesive layer is close to the fireproof layer to obtain the high-pressure and high-temperature resistant insulating single-layer fireproof composite tape.

[0055] Further, in step (1), the silicone, inorganic ceramic filler, flame retardant filler, curing agent, alkynol inhibitor and Pt catalyst are added to the mixer in sequence and mixed evenly to obtain the silicone composition.

[0056] In a specific embodiment, in step (1), the silicone is added to a mixer and mixed evenly for 10-20 min; inorganic ceramic filler is added and mixed evenly for 10-20 min; flame retardant filler is added and mixed evenly for 10-20 min; curing agent and alkynol inhibitor are added and mixed evenly for 20-40 min; Pt catalyst is added and mixed evenly for 20-40 min to obtain the silicone composition.

[0057] Further, in step (2), at 80-100 ℃, the silicone, inorganic ceramic filler, release agent and flame retardant filler are added to the mixer in sequence, mixed evenly and then cooled to below 40 ℃, and the curing agent, alkynol inhibitor and Pt catalyst are added in sequence and mixed evenly to obtain the silicone release composition.

[0058] In a specific embodiment, in step (2), silicone is added to a mixer, heated to 80-100 ℃, mixed evenly, and stirred for 10-20 min; while maintaining 80-100 ℃, inorganic ceramic filler and release agent are added and mixed evenly, and stirred for 10-20 min; while maintaining 80-100 ℃, flame retardant filler is added and mixed evenly, and stirred for 10-20 min; while cooling to below 40 ℃, curing agent and alkynol inhibitor are added, mixed evenly, and stirred for 20-40 min; while always controlling the temperature below 40 ℃, Pt catalyst is added, mixed evenly, and stirred for 20-40 min to obtain silicone release composition.

[0059] Further, in step (3), a release film is pre-attached to the side of the low-tack acrylic adhesive layer of the double-sided adhesive layer away from the PET layer; before winding, the release film is peeled off to expose the low-tack acrylic adhesive layer of the double-sided adhesive layer, and then it is wound up so that it comes into direct contact with the fireproof release layer to obtain the high-pressure and high-temperature resistant insulating single-wrap fireproof composite tape.

[0060] In this invention, the release film is only used temporarily when applying double-sided adhesive and is peeled off when rewinding.

[0061] The third aspect of this invention provides the application of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape described in the first aspect in new energy vehicles, especially suitable for insulation protection and fireproof sealing of core high-voltage components such as high-voltage wiring harnesses, battery pack modules, motor controllers and charging and distribution units in new energy vehicles.

[0062] The beneficial effects of this invention are:

[0063] This invention reduces the hardness and increases the flexibility of the fireproof layer by introducing hydrogen-terminated polydimethylsiloxane and polymethylhydrosiloxane into the fireproof layer, enabling the fireproof composite tape to meet the requirements of smooth and wrinkle-free automatic winding of irregular metal parts. In the fireproof release layer, the synergistic effect of functional polymers such as polymethylhydrosiloxane, γ-methacryloyloxypropyltrimethoxysilane, and vinylsiloxane improves the apparent strength and easy peeling of the fireproof release layer, realizing single-batch production and automated operation. At the same time, the high-adhesion side of the high- and low-adhesion double-sided adhesive layer ensures strong bonding with the fireproof layer without delamination, while the low-adhesion side supports the automated unwinding of the fireproof composite tape without residue. Detailed Implementation

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0065] The present invention will be further described below with reference to specific embodiments, so that those skilled in the art can better understand and implement the present invention, but the embodiments are not intended to limit the present invention.

[0066] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the materials and reagents used are commercially available.

[0067] In the following examples, the viscosity of vinyl-terminated polydimethylsiloxane is 1000 mPa·s, with a vinyl content of 0.28 wt%; the viscosity of methyl vinyl MQ silicone resin is 15000 mPa·s, with a vinyl content of 1.25 wt% and an M / Q ratio of 0.6-1.0; the viscosity of polymethylhydrosiloxane is 350 mPa·s, with a hydrogen content of 0.18-1.6 wt%; the hydrogen content in hydrogen-terminated polydimethylsiloxane is 0.07 wt%; and the specific surface area of ​​silazane-treated fumed silica is 200 m². 2 / g; the D50 particle size of zinc borate is 2 μm and the D90 particle size is 45 μm; the D50 particle size of mica powder is 5 μm and the D90 particle size is 45 μm; the D50 particle size of kaolin is 1.2 μm and the D90 particle size is 45 μm; the D50 particle size of aluminum hydroxide is 1.5 μm and the D90 particle size is 45 μm; the hydrogen content of the low hydrogen content side-chain type hydrogen-containing silicone oil is 0.40%; the hydrogen content of the high hydrogen content side-chain type hydrogen-containing silicone oil is 1.5%; the Pt content in the Castel platinum catalyst is 2000 ppm.

[0068] Example 1

[0069] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.06 mm, a fireproof layer with a thickness of 0.07 mm, a glass fiber layer with a thickness of 0.20 mm, and a fireproof release layer with a thickness of 0.07 mm, which are stacked sequentially.

[0070] The double-sided adhesive layer comprises a low-tack acrylic adhesive layer with a thickness of 0.023 mm, a PET layer with a thickness of 0.012 mm, and a high-tack acrylic adhesive layer with a thickness of 0.025 mm. The high-tack acrylic adhesive layer is located close to the fireproof layer. The side of the double-sided adhesive layer containing the high-tack acrylic adhesive layer is the high-tack side, and when the high-tack side is bonded to the fireproof layer, the 180° peel force is 9 N / cm. The side of the double-sided adhesive layer containing the low-tack acrylic adhesive layer is the low-tack side, and when the low-tack side is bonded to the fireproof release layer, the 180° peel force is 6 N / cm.

[0071] The fireproof layer is formed by curing an organosilicon composition, which comprises the following components by weight percentage: 35% organosilicon (specifically, 30% vinyl-terminated polydimethylsiloxane, 0.5% methyl vinyl MQ silicone resin, 3% polymethylhydrosiloxane, and 1.5% hydrogen-terminated polydimethylsiloxane), 1% curing agent (specifically, 0.8% low-hydrogen-content side-chain type hydrogen-containing silicone oil and 0.2% high-hydrogen-content side-chain type hydrogen-containing silicone oil), 0.35% reaction aid (specifically, 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 23.65% flame-retardant filler (specifically, 23.5% aluminum hydroxide and 0.15% benzotriazole), and 40% inorganic ceramicized filler (specifically, 8% silazane-treated fumed silica, 4% zinc borate, 12% mica powder, and 16% kaolin).

[0072] The fire-retardant release layer is formed by curing an organosilicon release composition, which comprises an organosilicon composition and a release agent. The organosilicon release composition contains the following components by weight percentage: 34.55% organosilicon (specifically, 29.7% vinyl-terminated polydimethylsiloxane, 0.35% methyl vinyl MQ silicone, 3% polymethylhydrosiloxane, and 1.5% hydrogen-terminated polydimethylsiloxane), and 1% curing agent (specifically, 0.8% low-hydrogen content side). The product composition includes: chain-type hydrogen-containing silicone oil, 0.2% high-hydrogen-content side-chain hydrogen-containing silicone oil, 0.35% reaction aids (specifically 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 23.65% flame-retardant fillers (specifically 23.5% aluminum hydroxide and 0.15% benzotriazole), 40% inorganic ceramicized fillers (specifically 8% silazane-treated fumed silica, 4% zinc borate, 12% mica powder, and 16% kaolin), and 0.45% stripping aids (specifically 0.3% γ-methacryloyloxypropyltrimethoxysilane and 0.15% SYL-OFF). TM 7678).

[0073] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape in Example 1 includes the following steps:

[0074] (1) Add 30 parts of vinyl-terminated polydimethylsiloxane, 0.5 parts of methyl vinyl MQ silicone resin, 3 parts of polymethylhydrosiloxane and 1.5 parts of hydrogen-terminated polydimethylsiloxane to a mixer, mix evenly and stir for 10 min; add 8 parts of silazane-treated fumed silica, 4 parts of zinc borate, 12 parts of mica powder and 16 parts of kaolin and continue to mix evenly and stir for 20 min; add 23.5 parts of aluminum hydroxide and 0.15 parts of benzotriazole and continue to mix evenly and stir for 20 min; add 0.8 parts of low hydrogen content side-chain type hydrogen-containing silicone oil, 0.2 parts of high hydrogen content side-chain type hydrogen-containing silicone oil and 0.05 parts of ethynylcyclohexanol, mix evenly and stir for 20 min; add 0.3 parts of caster platinum catalyst, mix evenly and stir for 30 min to obtain an organosilicon composition.

[0075] (2) Add 29.7 parts of vinyl-terminated polydimethylsiloxane, 0.35 parts of methyl vinyl MQ silicone resin, 3 parts of polymethylhydrosiloxane and 1.5 parts of hydrogen-terminated polydimethylsiloxane to a mixer, heat to 80 °C, mix evenly and stir for 10 min; keep at 80 °C, add 8 parts of silazane-treated fumed silica, 4 parts of zinc borate, 12 parts of mica powder, 16 parts of kaolin, 0.3 parts of γ-methacryloyloxypropyltrimethoxysilane and 0.15 parts of SYL-OFF TM 7678 was mixed thoroughly and stirred for 20 min; while maintaining 80 ℃, 23.5 parts of aluminum hydroxide and 0.15 parts of benzotriazole were added and mixed thoroughly and stirred for 20 min; the temperature was lowered to below 40 ℃, and 0.8 parts of low-hydrogen-content side-chain type hydrogen-containing silicone oil, 0.2 parts of high-hydrogen-content side-chain type hydrogen-containing silicone oil and 0.05 parts of ethynylcyclohexanol were added, mixed thoroughly and stirred for 20 min; while maintaining the temperature below 40 ℃, 0.3 parts of caster platinum catalyst were added, mixed thoroughly and stirred for 20 min to obtain the silicone release composition.

[0076] (3) Using glass fiber with a thickness of 0.20 mm as the substrate, the silicone composition obtained in step (1) is coated on one side of the substrate by a coating machine, and after drying, a fireproof layer with a thickness of 0.07 mm is formed; the silicone release composition obtained in step (2) is coated on the other side of the glass fiber by a coating machine, and after drying, a fireproof release layer with a thickness of 0.07 mm is formed; a double-sided adhesive layer with a thickness of 0.06 mm is attached to the side of the fireproof layer away from the glass fiber, the high-tack acrylic adhesive layer of the double-sided adhesive layer is close to the fireproof layer, and the low-tack acrylic adhesive layer of the double-sided adhesive layer is pre-attached with a release film on the side away from the PET layer; before winding, the release film is peeled off to expose the low-tack acrylic adhesive layer of the double-sided adhesive layer, and then the tape is wound up so that it is in direct contact with the fireproof release layer, to obtain a high-pressure and high-temperature resistant insulating single-wrap fireproof composite tape with a thickness of 0.40 mm.

[0077] Example 2

[0078] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.05 mm, a fireproof layer with a thickness of 0.05 mm, a glass fiber layer with a thickness of 0.20 mm, and a fireproof release layer with a thickness of 0.05 mm, which are stacked sequentially.

[0079] The double-sided adhesive layer comprises a low-tack acrylic adhesive layer with a thickness of 0.013 mm, a PET layer with a thickness of 0.012 mm, and a high-tack acrylic adhesive layer with a thickness of 0.025 mm. The high-tack acrylic adhesive layer is located close to the fireproof layer. The side of the double-sided adhesive layer containing the high-tack acrylic adhesive layer is the high-tack side, and when the high-tack side is bonded to the fireproof layer, the 180° peel force is 8 N / cm. The side of the double-sided adhesive layer containing the low-tack acrylic adhesive layer is the low-tack side, and when the low-tack side is bonded to the fireproof release layer, the 180° peel force is 4 N / cm.

[0080] The fireproof layer is formed by curing an organosilicon composition, which comprises the following components by weight percentage: 30.25% organosilicon (specifically, 26.8% vinyl-terminated polydimethylsiloxane, 0.65% methyl vinyl MQ silicone resin, 2% polymethylhydrosiloxane, and 0.8% hydrogen-terminated polydimethylsiloxane), 0.9% curing agent (specifically, 0.75% low-hydrogen-content side-chain type hydrogen-containing silicone oil and 0.15% high-hydrogen-content side-chain type hydrogen-containing silicone oil), 0.35% reaction aid (specifically, 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 30.5% flame-retardant filler (specifically, 30% aluminum hydroxide and 0.5% benzotriazole), and 38% inorganic ceramicized filler (specifically, 6% silazane-treated fumed silica, 6% zinc borate, 11% mica powder, and 15% kaolin).

[0081] The fire-retardant release layer is formed by curing an organosilicon release composition, which comprises an organosilicon composition and a release aid. The organosilicon release composition contains the following components by weight percentage: 29.7% organosilicon (specifically 26.25% vinyl-terminated polydimethylsiloxane, 0.65% methyl vinyl MQ silicone resin, 2% polymethylhydrosiloxane, and 0.8% hydrogen-terminated polydimethylsiloxane), and 0.9% curing agent (specifically 0.75% low-hydrogen content polydimethylsiloxane). The product composition includes: 0.15% high-hydrogen-content side-chain hydrogen-containing silicone oil, 0.35% reaction aid (specifically 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 30.5% flame-retardant filler (specifically 30% aluminum hydroxide and 0.5% benzotriazole), 38% inorganic ceramicized filler (specifically 6% silazane-treated fumed silica, 6% zinc borate, 11% mica powder, and 15% kaolin), and 0.55% stripping aid (specifically 0.35% γ-methacryloyloxypropyltrimethoxysilane and 0.2% SYL-OFF). TM 7678).

[0082] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape in Example 2 includes the following steps:

[0083] (1) Add 26.8 parts of vinyl-terminated polydimethylsiloxane, 0.65 parts of methyl vinyl MQ silicone resin, 2 parts of polymethylhydrosiloxane and 0.8 parts of hydrogen-terminated polydimethylsiloxane to a mixer, mix evenly and stir for 10 min; add 6 parts of silazane-treated fumed silica, 6 parts of zinc borate, 11 parts of mica powder and 15 parts of kaolin and continue to mix evenly and stir for 20 min; add 30 parts of aluminum hydroxide and 0.5 parts of benzotriazole and continue to mix evenly and stir for 20 min; add 0.75 parts of low hydrogen content side-chain type hydrogen-containing silicone oil, 0.15 parts of high hydrogen content side-chain type hydrogen-containing silicone oil and 0.05 parts of ethynylcyclohexanol, mix evenly and stir for 20 min; add 0.3 parts of caster platinum catalyst, mix evenly and stir for 30 min to obtain an organosilicon composition.

[0084] (2) Add 26.25 parts of vinyl-terminated polydimethylsiloxane, 0.65 parts of methyl vinyl MQ silicone resin, 2 parts of polymethylhydrosiloxane and 0.8 parts of hydrogen-terminated polydimethylsiloxane to a mixer, heat to 80 °C, mix evenly and stir for 10 min; keep at 80 °C, add 6 parts of silazane-treated fumed silica, 6 parts of zinc borate, 11 parts of mica powder, 15 parts of kaolin, 0.35 parts of γ-methacryloyloxypropyltrimethoxysilane and 0.2 parts of SYL-OFF TM7678 was mixed thoroughly and stirred for 20 min; while maintaining 80 ℃, 30 parts of aluminum hydroxide and 0.5 parts of benzotriazole were added and mixed thoroughly and stirred for 20 min; the temperature was lowered to below 40 ℃, and 0.75 parts of low-hydrogen-content side-chain type hydrogen-containing silicone oil, 0.15 parts of high-hydrogen-content side-chain type hydrogen-containing silicone oil and 0.05 parts of ethynylcyclohexanol were added, mixed thoroughly and stirred for 20 min; while maintaining the temperature below 40 ℃, 0.3 parts of Castel platinum catalyst were added, mixed thoroughly and stirred for 20 min to obtain the silicone release composition.

[0085] (3) Using glass fiber with a thickness of 0.20 mm as the substrate, the silicone composition obtained in step (1) is coated on one side of the substrate by a coating machine, and after drying, a fireproof layer with a thickness of 0.05 mm is formed; the silicone release composition obtained in step (2) is coated on the other side of the glass fiber by a coating machine, and after drying, a fireproof release layer with a thickness of 0.05 mm is formed; a double-sided adhesive layer with a thickness of 0.05 mm is attached to the side of the fireproof layer away from the glass fiber, the high-tack acrylic adhesive layer of the double-sided adhesive layer is close to the fireproof layer, and the low-tack acrylic adhesive layer of the double-sided adhesive layer is pre-attached with a release film on the side away from the PET layer; before winding, the release film is peeled off to expose the low-tack acrylic adhesive layer of the double-sided adhesive layer, and then the tape is wound up so that it is in direct contact with the fireproof release layer, to obtain a high-pressure and high-temperature resistant insulating single-wrap fireproof composite tape with a thickness of 0.35 mm.

[0086] Example 3

[0087] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.05 mm, a fireproof layer with a thickness of 0.06 mm, a glass fiber layer with a thickness of 0.13 mm, and a fireproof release layer with a thickness of 0.06 mm, which are stacked sequentially.

[0088] The double-sided adhesive layer comprises a low-tack acrylic adhesive layer with a thickness of 0.013 mm, a PET layer with a thickness of 0.012 mm, and a high-tack acrylic adhesive layer with a thickness of 0.025 mm. The high-tack acrylic adhesive layer is located close to the fireproof layer. The side of the double-sided adhesive layer containing the high-tack acrylic adhesive layer is the high-tack side, and when the high-tack side is bonded to the fireproof layer, the 180° peel force is 8 N / cm. The side of the double-sided adhesive layer containing the low-tack acrylic adhesive layer is the low-tack side, and when the low-tack side is bonded to the fireproof release layer, the 180° peel force is 6 N / cm.

[0089] The fireproof layer is formed by curing an organosilicon composition, which comprises the following components by weight percentage: 30.25% organosilicon (specifically, 26.8% vinyl-terminated polydimethylsiloxane, 0.65% methyl vinyl MQ silicone resin, 2% polymethylhydrosiloxane, and 0.8% hydrogen-terminated polydimethylsiloxane), 0.9% curing agent (specifically, 0.75% low-hydrogen-content side-chain type hydrogen-containing silicone oil and 0.15% high-hydrogen-content side-chain type hydrogen-containing silicone oil), 0.35% reaction aid (specifically, 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 30.5% flame-retardant filler (specifically, 30% aluminum hydroxide and 0.5% benzotriazole), and 38% inorganic ceramicized filler (specifically, 6% silazane-treated fumed silica, 6% zinc borate, 11% mica powder, and 15% kaolin).

[0090] The fire-retardant release layer is formed by curing an organosilicon release composition, which comprises an organosilicon composition and a release aid. The organosilicon release composition contains the following components by weight percentage: 29.7% organosilicon (specifically 26.25% vinyl-terminated polydimethylsiloxane, 0.65% methyl vinyl MQ silicone resin, 2% polymethylhydrosiloxane, and 0.8% hydrogen-terminated polydimethylsiloxane), and 0.9% curing agent (specifically 0.75% low-hydrogen content polydimethylsiloxane). The product composition includes: 0.15% high-hydrogen-content side-chain hydrogen-containing silicone oil, 0.35% reaction aid (specifically 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 30.5% flame-retardant filler (specifically 30% aluminum hydroxide and 0.5% benzotriazole), 38% inorganic ceramicized filler (specifically 6% silazane-treated fumed silica, 6% zinc borate, 11% mica powder, and 15% kaolin), and 0.55% stripping aid (specifically 0.35% γ-methacryloyloxypropyltrimethoxysilane and 0.2% SYL-OFF). TM 7678).

[0091] The preparation method of the high-pressure and high-temperature resistant insulating single-roll fireproof composite tape in Example 3 is basically the same as that in Example 2. The difference is that in step (3), glass fiber with a thickness of 0.13 mm is used as the substrate, and the silicone composition obtained in step (1) is coated on one side of the substrate by a coating machine. After drying, a fireproof layer with a thickness of 0.06 mm is formed. On the other side of the glass fiber, the silicone release composition obtained in step (2) is coated on the substrate by a coating machine. After drying, a fireproof release layer with a thickness of 0.06 mm is formed. A double-sided adhesive layer with a thickness of 0.05 mm is attached to the side of the fireproof layer away from the glass fiber. The high-tack acrylic adhesive layer of the double-sided adhesive layer is close to the fireproof layer, and the low-tack acrylic adhesive layer of the double-sided adhesive layer is pre-attached with a release film on the side away from the PET layer. Before winding, the release film is peeled off to expose the low-tack acrylic adhesive layer of the double-sided adhesive layer. Then, the tape is wound up so that it is in direct contact with the fireproof release layer to obtain a high-pressure and high-temperature resistant insulating single-roll fireproof composite tape with a thickness of 0.30 mm.

[0092] Example 4

[0093] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.05 mm, a fireproof layer with a thickness of 0.04 mm, a glass fiber layer with a thickness of 0.13 mm, and a fireproof release layer with a thickness of 0.04 mm, which are stacked sequentially.

[0094] The double-sided adhesive layer comprises a low-tack acrylic adhesive layer with a thickness of 0.013 mm, a PET layer with a thickness of 0.012 mm, and a high-tack acrylic adhesive layer with a thickness of 0.025 mm. The high-tack acrylic adhesive layer is located close to the fireproof layer. The side of the double-sided adhesive layer containing the high-tack acrylic adhesive layer is the high-tack side, and when the high-tack side is bonded to the fireproof layer, the 180° peel force is 7 N / cm. The side of the double-sided adhesive layer containing the low-tack acrylic adhesive layer is the low-tack side, and when the low-tack side is bonded to the fireproof release layer, the 180° peel force is 5 N / cm.

[0095] The fireproof layer is formed by curing an organosilicon composition, which comprises the following components by weight percentage: 27.25% organosilicon (specifically, 23.8% vinyl-terminated polydimethylsiloxane, 0.5% methyl vinyl MQ silicone resin, 2.3% polymethylhydrosiloxane, and 0.65% hydrogen-terminated polydimethylsiloxane), 0.75% curing agent (specifically, 0.6% low-hydrogen-content side-chain type hydrogen-containing silicone oil and 0.15% high-hydrogen-content side-chain type hydrogen-containing silicone oil), 0.35% reaction aid (specifically, 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 31.65% flame-retardant filler (specifically, 31% aluminum hydroxide and 0.65% benzotriazole), and 40% inorganic ceramicized filler (specifically, 6% silazane-treated fumed silica, 8% zinc borate, 10% mica powder, and 16% kaolin).

[0096] The fire-retardant release layer is formed by curing an organosilicon release composition, which comprises an organosilicon composition and a release agent. The organosilicon release composition contains the following components by weight percentage: 26.6% organosilicon (specifically 23.15% vinyl-terminated polydimethylsiloxane, 0.5% methyl vinyl MQ silicone, 2.3% polymethylhydrosiloxane, and 0.65% hydrogen-terminated polydimethylsiloxane), and 0.75% curing agent (specifically 0.6% low-content...). The product composition includes: hydrogen-containing side-chain silicone oil (0.15% high-hydrogen-content side-chain silicone oil), 0.35% reaction aid (specifically 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 31.65% flame-retardant filler (specifically 31% aluminum hydroxide and 0.65% benzotriazole), 40% inorganic ceramicized filler (specifically 6% silazane-treated fumed silica, 8% zinc borate, 10% mica powder, and 16% kaolin), and 0.65% stripping aid (specifically 0.4% γ-methacryloyloxypropyltrimethoxysilane and 0.25% SYL-OFF). TM 7678).

[0097] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape in Example 4 includes the following steps:

[0098] (1) Add 23.8 parts of vinyl-terminated polydimethylsiloxane, 0.5 parts of methyl vinyl MQ silicone resin, 2.3 parts of polymethylhydrosiloxane and 0.65 parts of hydrogen-terminated polydimethylsiloxane to a mixer, mix evenly and stir for 10 min; add 6 parts of silazane-treated fumed silica, 8 parts of zinc borate, 10 parts of mica powder and 16 parts of kaolin and continue to mix evenly and stir for 20 min; add 31 parts of aluminum hydroxide and 0.65 parts of benzotriazole and continue to mix evenly and stir for 20 min; add 0.6 parts of low hydrogen content side-chain type hydrogen-containing silicone oil, 0.15 parts of high hydrogen content side-chain type hydrogen-containing silicone oil and 0.05 parts of ethynylcyclohexanol, mix evenly and stir for 20 min; add 0.3 parts of caster platinum catalyst, mix evenly and stir for 30 min to obtain an organosilicon composition.

[0099] (2) Add 23.15 parts of vinyl-terminated polydimethylsiloxane, 0.5 parts of methyl vinyl MQ silicone resin, 2.3 parts of polymethylhydrosiloxane and 0.65 parts of hydrogen-terminated polydimethylsiloxane to a mixer, heat to 80 °C, mix evenly and stir for 10 min; keep at 80 °C, add 6 parts of silazane-treated fumed silica, 8 parts of zinc borate, 10 parts of mica powder, 16 parts of kaolin, 0.4 parts of γ-methacryloyloxypropyltrimethoxysilane and 0.25 parts of SYL-OFF TM 7678 was mixed thoroughly and stirred for 20 min; while maintaining 80 ℃, 31 parts of aluminum hydroxide and 0.65 parts of benzotriazole were added and mixed thoroughly and stirred for 20 min; the temperature was lowered to below 40 ℃, and 0.6 parts of low-hydrogen-content side-chain type hydrogen-containing silicone oil, 0.15 parts of high-hydrogen-content side-chain type hydrogen-containing silicone oil and 0.05 parts of ethynylcyclohexanol were added, mixed thoroughly and stirred for 20 min; while maintaining the temperature below 40 ℃, 0.3 parts of Castells platinum catalyst were added, mixed thoroughly and stirred for 20 min to obtain the silicone release composition.

[0100] (3) Using glass fiber with a thickness of 0.13 mm as the substrate, the silicone composition obtained in step (1) is coated on one side of the substrate by a coating machine, and after drying, a fireproof layer with a thickness of 0.04 mm is formed; the silicone release composition obtained in step (2) is coated on the other side of the glass fiber by a coating machine, and after drying, a fireproof release layer with a thickness of 0.04 mm is formed; a double-sided adhesive layer with a thickness of 0.05 mm is attached to the side of the fireproof layer away from the glass fiber, the high-tack acrylic adhesive layer of the double-sided adhesive layer is close to the fireproof layer, and the low-tack acrylic adhesive layer of the double-sided adhesive layer is pre-attached with a release film on the side away from the PET layer; before winding, the release film is peeled off to expose the low-tack acrylic adhesive layer of the double-sided adhesive layer, and then the tape is wound up so that it is in direct contact with the fireproof release layer, to obtain a high-pressure and high-temperature resistant insulating single-wrap fireproof composite tape with a thickness of 0.26 mm.

[0101] Example 5

[0102] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.05 mm, a fireproof layer with a thickness of 0.05 mm, a glass fiber layer with a thickness of 0.10 mm, and a fireproof release layer with a thickness of 0.05 mm, which are stacked sequentially.

[0103] The double-sided adhesive layer comprises a low-tack acrylic adhesive layer with a thickness of 0.013 mm, a PET layer with a thickness of 0.012 mm, and a high-tack acrylic adhesive layer with a thickness of 0.025 mm. The high-tack acrylic adhesive layer is located close to the fireproof layer. The side of the double-sided adhesive layer containing the high-tack acrylic adhesive layer is the high-tack side, and when the high-tack side is bonded to the fireproof layer, the 180° peel force is 7 N / cm. The side of the double-sided adhesive layer containing the low-tack acrylic adhesive layer is the low-tack side, and when the low-tack side is bonded to the fireproof release layer, the 180° peel force is 5 N / cm.

[0104] The fireproof layer is formed by curing an organosilicon composition, which comprises the following components by weight percentage: 27.25% organosilicon (specifically, 23.8% vinyl-terminated polydimethylsiloxane, 0.5% methyl vinyl MQ silicone resin, 2.3% polymethylhydrosiloxane, and 0.65% hydrogen-terminated polydimethylsiloxane), 0.75% curing agent (specifically, 0.6% low-hydrogen-content side-chain type hydrogen-containing silicone oil and 0.15% high-hydrogen-content side-chain type hydrogen-containing silicone oil), 0.35% reaction aid (specifically, 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 31.65% flame-retardant filler (specifically, 31% aluminum hydroxide and 0.65% benzotriazole), and 40% inorganic ceramicized filler (specifically, 6% silazane-treated fumed silica, 8% zinc borate, 10% mica powder, and 16% kaolin).

[0105] The fire-retardant release layer is formed by curing an organosilicon release composition, which comprises an organosilicon composition and a release agent. The organosilicon release composition contains the following components by weight percentage: 26.6% organosilicon (specifically 23.15% vinyl-terminated polydimethylsiloxane, 0.5% methyl vinyl MQ silicone, 2.3% polymethylhydrosiloxane, and 0.65% hydrogen-terminated polydimethylsiloxane), and 0.75% curing agent (specifically 0.6% low-content...). The product composition includes: hydrogen-containing side-chain silicone oil (0.15% high-hydrogen-content side-chain silicone oil), 0.35% reaction aid (specifically 0.05% ethynylcyclohexanol and 0.3% caster platinum catalyst), 31.65% flame-retardant filler (specifically 31% aluminum hydroxide and 0.65% benzotriazole), 40% inorganic ceramicized filler (specifically 6% silazane-treated fumed silica, 8% zinc borate, 10% mica powder, and 16% kaolin), and 0.65% stripping aid (specifically 0.4% γ-methacryloyloxypropyltrimethoxysilane and 0.25% SYL-OFF). TM 7678).

[0106] The preparation method of the high-pressure and high-temperature resistant insulating single-roll fireproof composite tape in Example 5 is basically the same as that in Example 4. The difference is that in step (3), glass fiber with a thickness of 0.10 mm is used as the substrate, and the silicone composition obtained in step (1) is coated on one side of the substrate by a coating machine. After drying, a fireproof layer with a thickness of 0.05 mm is formed. On the other side of the glass fiber, the silicone release composition obtained in step (2) is coated on the substrate by a coating machine. After drying, a fireproof release layer with a thickness of 0.05 mm is formed. A double-sided adhesive layer with a thickness of 0.05 mm is attached to the side of the fireproof layer away from the glass fiber. The high-tack acrylic adhesive layer of the double-sided adhesive layer is close to the fireproof layer, and a release film is pre-attached to the side of the low-tack acrylic adhesive layer of the double-sided adhesive layer away from the PET layer. Before winding, the release film is peeled off to expose the low-tack acrylic adhesive layer of the double-sided adhesive layer. Then, the tape is wound up so that it is in direct contact with the fireproof release layer to obtain a high-pressure and high-temperature resistant insulating single-roll fireproof composite tape with a thickness of 0.25 mm.

[0107] Comparative Example 1

[0108] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.06 mm, a fireproof layer with a thickness of 0.07 mm, a glass fiber layer with a thickness of 0.20 mm, and a fireproof release layer with a thickness of 0.07 mm, which are stacked in sequence. It is basically the same as Example 1, except that the fireproof layer and the fireproof release layer do not contain polymethylhydrosiloxane.

[0109] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape of Comparative Example 1 includes the following steps:

[0110] (1) Add 30 parts of vinyl-terminated polydimethylsiloxane, 0.5 parts of methyl vinyl MQ silicone resin and 1.5 parts of hydrogen-terminated polydimethylsiloxane to a mixer, mix evenly and stir for 10 min; add 8 parts of silazane-treated fumed silica, 4 parts of zinc borate, 12 parts of mica powder and 16 parts of kaolin and continue to mix evenly and stir for 20 min; add 23.5 parts of aluminum hydroxide and 0.15 parts of benzotriazole and continue to mix evenly and stir for 20 min; add 0.8 parts of low hydrogen content side-chain type hydrogen-containing silicone oil, 0.2 parts of high hydrogen content side-chain type hydrogen-containing silicone oil and 0.05 parts of ethynylcyclohexanol, mix evenly and stir for 20 min; add 0.3 parts of caster platinum catalyst, mix evenly and stir for 30 min to obtain an organosilicon composition.

[0111] (2) Add 29.7 parts of vinyl-terminated polydimethylsiloxane, 0.35 parts of methyl vinyl MQ silicone resin and 1.5 parts of hydrogen-terminated polydimethylsiloxane to a mixer, heat to 80 °C, mix evenly and stir for 10 min; keep at 80 °C, add 8 parts of silazane-treated fumed silica, 4 parts of zinc borate, 12 parts of mica powder, 16 parts of kaolin, 0.3 parts of γ-methacryloyloxypropyltrimethoxysilane and 0.15 parts of SYL-OFF TM Continue mixing 7678 until homogeneous and stirring for 20 min; maintain 80 ℃, add 23.5 parts aluminum hydroxide and 0.15 parts benzotriazole and continue mixing until homogeneous and stirring for 20 min; cool to below 40 ℃, add 0.8 parts low hydrogen content side-chain type hydrogen-containing silicone oil, 0.2 parts high hydrogen content side-chain type hydrogen-containing silicone oil and 0.05 parts ethynylcyclohexanol, mix until homogeneous and stir for 20 min; always maintain 40 ℃ below 40 ℃, add 0.3 parts caster platinum catalyst, mix until homogeneous and stir for 20 min to obtain the silicone release composition.

[0112] (3) Using glass fiber with a thickness of 0.20 mm as the substrate, the silicone composition obtained in step (1) is coated on one side of the substrate by a coating machine, and after drying, a fireproof layer with a thickness of 0.07 mm is formed; the silicone release composition obtained in step (2) is coated on the other side of the glass fiber by a coating machine, and after drying, a fireproof release layer with a thickness of 0.07 mm is formed; a double-sided adhesive layer with a thickness of 0.06 mm is attached to the side of the fireproof layer away from the glass fiber, the high-tack acrylic adhesive layer of the double-sided adhesive layer is close to the fireproof layer, and the low-tack acrylic adhesive layer of the double-sided adhesive layer is pre-attached with a release film on the side away from the PET layer; before winding, the release film is peeled off to expose the low-tack acrylic adhesive layer of the double-sided adhesive layer, and then the tape is wound up so that it is in direct contact with the fireproof release layer, to obtain a high-pressure and high-temperature resistant insulating single-wrap fireproof composite tape with a thickness of 0.4 mm.

[0113] Comparative Example 2

[0114] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.06 mm, a fireproof layer with a thickness of 0.07 mm, a glass fiber layer with a thickness of 0.20 mm, and a fireproof release layer with a thickness of 0.07 mm, which are stacked in sequence. It is basically the same as Example 1, except that the fireproof layer and the fireproof release layer do not contain hydrogen-terminated polydimethylsiloxane.

[0115] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape of Comparative Example 2 includes the following steps:

[0116] (1) Add 30 parts of vinyl-terminated polydimethylsiloxane, 0.5 parts of methyl vinyl MQ silicone resin and 3 parts of polymethylhydrosiloxane to a mixer, mix evenly and stir for 10 min; add 8 parts of silazane-treated fumed silica, 4 parts of zinc borate, 12 parts of mica powder and 16 parts of kaolin and continue to mix evenly and stir for 20 min; add 23.5 parts of aluminum hydroxide and 0.15 parts of benzotriazole and continue to mix evenly and stir for 20 min; add 0.8 parts of low hydrogen content side-chain type hydrogen-containing silicone oil, 0.2 parts of high hydrogen content side-chain type hydrogen-containing silicone oil and 0.05 parts of ethynylcyclohexanol, mix evenly and stir for 20 min; add 0.3 parts of caster platinum catalyst, mix evenly and stir for 30 min to obtain an organosilicon composition.

[0117] (2) Add 29.7 parts of vinyl-terminated polydimethylsiloxane, 0.35 parts of methyl vinyl MQ silicone resin and 3 parts of polymethylhydrosiloxane to a mixer, heat to 80 °C, mix evenly and stir for 10 min; keep at 80 °C, add 8 parts of silazane-treated fumed silica, 4 parts of zinc borate, 12 parts of mica powder, 16 parts of kaolin, 0.3 parts of γ-methacryloyloxypropyltrimethoxysilane and 0.15 parts of SYL-OFF TM 7678 was mixed thoroughly and stirred for 20 min; while maintaining 80 ℃, 23.5 parts of aluminum hydroxide and 0.15 parts of benzotriazole were added and mixed thoroughly and stirred for 20 min; the temperature was lowered to below 40 ℃, and 0.8 parts of low-hydrogen-content side-chain type hydrogen-containing silicone oil, 0.2 parts of high-hydrogen-content side-chain type hydrogen-containing silicone oil and 0.05 parts of ethynylcyclohexanol were added, mixed thoroughly and stirred for 20 min; while maintaining the temperature below 40 ℃, 0.3 parts of Castel platinum catalyst were added, mixed thoroughly and stirred for 20 min to obtain the silicone release composition.

[0118] (3) Using glass fiber with a thickness of 0.20 mm as the substrate, the silicone composition obtained in step (1) is coated on one side of the substrate by a coating machine, and after drying, a fireproof layer with a thickness of 0.07 mm is formed; the silicone release composition obtained in step (2) is coated on the other side of the glass fiber by a coating machine, and after drying, a fireproof release layer with a thickness of 0.07 mm is formed; a double-sided adhesive layer with a thickness of 0.06 mm is attached to the side of the fireproof layer away from the glass fiber, the high-tack acrylic adhesive layer of the double-sided adhesive layer is close to the fireproof layer, and the low-tack acrylic adhesive layer of the double-sided adhesive layer is pre-attached with a release film on the side away from the PET layer; before winding, the release film is peeled off to expose the low-tack acrylic adhesive layer of the double-sided adhesive layer, and then the tape is wound up so that it is in direct contact with the fireproof release layer, to obtain a high-pressure and high-temperature resistant insulating single-wrap fireproof composite tape with a thickness of 0.4 mm.

[0119] Comparative Example 3

[0120] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.06 mm, a fireproof layer with a thickness of 0.07 mm, a glass fiber layer with a thickness of 0.20 mm, and a fireproof release layer with a thickness of 0.07 mm, which are stacked sequentially. It is basically the same as Example 1, except that the fireproof release layer does not contain γ-methacryloyloxypropyltrimethoxysilane.

[0121] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape of Comparative Example 3 is basically the same as that of Example 1, except that: in step (2), 29.7 parts of vinyl-terminated polydimethylsiloxane, 0.35 parts of methyl vinyl MQ silicone resin, 3 parts of polymethylhydrosiloxane and 1.5 parts of hydrogen-terminated polydimethylsiloxane are added to a mixer, heated to 80°C, mixed evenly, and stirred for 10 min; while maintaining 80°C, 8 parts of silazane-treated fumed silica, 4 parts of zinc borate, 12 parts of mica powder, 16 parts of kaolin and 0.15 parts of SYL-OFF are added. TM Continue mixing 7678 until homogeneous and stirring for 20 min; maintain 80 ℃, add 23.5 parts aluminum hydroxide and 0.15 parts benzotriazole and continue mixing until homogeneous and stirring for 20 min; cool to below 40 ℃, add 0.8 parts low hydrogen content side-chain type hydrogen-containing silicone oil, 0.2 parts high hydrogen content side-chain type hydrogen-containing silicone oil and 0.05 parts ethynylcyclohexanol, mix until homogeneous and stir for 20 min; always maintain 40 ℃ below 40 ℃, add 0.3 parts caster platinum catalyst, mix until homogeneous and stir for 20 min to obtain the silicone release composition.

[0122] Comparative Example 4

[0123] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape comprises, in sequence, a 0.06 mm thick double-sided adhesive layer, a 0.07 mm thick fireproof layer, a 0.20 mm thick fiberglass layer, and a 0.07 mm thick fireproof release layer. It is essentially the same as Example 1, except that the fireproof release layer does not contain SYL-OFF. TM 7678.

[0124] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape of Comparative Example 4 is basically the same as that of Example 1, except that: in step (2), 29.7 parts of vinyl-terminated polydimethylsiloxane, 0.35 parts of methyl vinyl MQ silicone resin, 3 parts of polymethylhydrosiloxane and 1.5 parts of hydrogen-terminated polydimethylsiloxane are added to a mixer, heated to 80°C, mixed evenly, and stirred for 10 min; while maintaining 80°C, 8 parts of silazane-treated fumed silica, 4 parts of zinc borate, 12 parts of mica powder, 16 parts of kaolin and 0.3 parts of γ-methacryloyloxypropyltrimethoxysilane are added and mixed evenly, and stirred for 20 min; while maintaining 80°C, 23.5 parts of aluminum hydroxide and 0.15 parts of benzotriazole are added and mixed evenly, and stirred for 20 min; while cooling to 40°C... At a temperature below 40 °C, add 0.8 parts of low-hydrogen-content side-chain type hydrogen-containing silicone oil, 0.2 parts of high-hydrogen-content side-chain type hydrogen-containing silicone oil, and 0.05 parts of ethynylcyclohexanol, mix evenly, and stir for 20 min; always control the temperature below 40 °C, add 0.3 parts of Castel platinum catalyst, mix evenly, and stir for 20 min to obtain the silicone release composition.

[0125] Comparative Example 5

[0126] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.06 mm, a fireproof layer with a thickness of 0.07 mm, a glass fiber layer with a thickness of 0.20 mm, and a fireproof release layer with a thickness of 0.07 mm, which are stacked in sequence. It is basically the same as Example 1, except that polymethylhydrosiloxane is replaced with methyl silicone oil in the fireproof layer and the fireproof release layer.

[0127] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape of Comparative Example 5 is basically the same as that of Example 1, except that: in step (1), polymethylhydrosiloxane is replaced with methyl silicone oil; in step (2), polymethylhydrosiloxane is replaced with methyl silicone oil.

[0128] Comparative Example 6

[0129] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.06 mm, a fireproof layer with a thickness of 0.07 mm, a glass fiber layer with a thickness of 0.20 mm, and a fireproof release layer with a thickness of 0.07 mm, which are stacked sequentially. It is basically the same as Example 1, except that γ-methacryloyloxypropyltrimethoxysilane is replaced with vinyltrimethoxysilane in the fireproof layer and the fireproof release layer.

[0130] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape of Comparative Example 6 is basically the same as that of Example 1, except that: in step (1), γ-methacryloxypropyltrimethoxysilane is replaced with vinyltrimethoxysilane; in step (2), γ-methacryloxypropyltrimethoxysilane is replaced with vinyltrimethoxysilane.

[0131] Comparative Example 7

[0132] A high-pressure and high-temperature resistant insulating single-layer fireproof composite tape includes a double-sided adhesive layer with a thickness of 0.06 mm, a fireproof layer with a thickness of 0.07 mm, a glass fiber layer with a thickness of 0.20 mm, and a fireproof release layer with a thickness of 0.07 mm, which are stacked sequentially. It is basically the same as Example 1, except that the curing agent content in the fireproof layer and the fireproof release layer is 1% (specifically 0.5% low hydrogen content side-chain type hydrogen-containing silicone oil and 0.5% high hydrogen content side-chain type hydrogen-containing silicone oil).

[0133] The preparation method of the high-voltage and high-temperature resistant insulating single-layer fireproof composite tape of Comparative Example 7 is basically the same as that of Example 1. The difference is that in step (1), 0.8 parts of low hydrogen content side-chain type hydrogen-containing silicone oil and 0.2 parts of high hydrogen content side-chain type hydrogen-containing silicone oil are replaced with 0.5 parts of low hydrogen content side-chain type hydrogen-containing silicone oil and 0.5 parts of high hydrogen content side-chain type hydrogen-containing silicone oil; in step (2), 0.8 parts of low hydrogen content side-chain type hydrogen-containing silicone oil and 0.2 parts of high hydrogen content side-chain type hydrogen-containing silicone oil are replaced with 0.5 parts of low hydrogen content side-chain type hydrogen-containing silicone oil and 0.5 parts of high hydrogen content side-chain type hydrogen-containing silicone oil.

[0134] Test case

[0135] The high-voltage and high-temperature resistant single-layer fireproof composite tapes of Examples 1-5 and Comparative Examples 1-7 were subjected to high-temperature insulation performance tests, bonding performance tests, rework performance tests, and single-layer performance tests. The test methods are as follows:

[0136] High-temperature insulation performance test: The fireproof composite tape was placed in an environment of 800±100 ℃ and burned for 30 min. After the burning was completed, its insulation resistance was tested.

[0137] Adhesion performance test: Using automated winding equipment, fireproof composite tape is wound onto the surface of irregular metal parts. The winding process simulates actual application conditions. After winding, the whole sample is placed in a normal temperature and humidity environment for 7 days to observe the adhesion between the fireproof composite tape and the surface of the metal parts and to determine whether there are wrinkles, peeling or other phenomena.

[0138] Rework performance test: Take the sample that has been placed for 7 days in the bonding performance test, unwrap the fireproof composite tape, and observe whether there is any residual adhesive layer on the surface of the metal parts and the fireproof composite tape itself. At the same time, check whether the fireproof composite tape maintains its structural integrity after unwinding to evaluate its rework feasibility.

[0139] Single roll performance test: The fireproof composite tape is rolled up according to the actual production process to form a standard roll; then the roll is placed in a constant temperature environment of 60 ℃ for accelerated aging treatment for 7 days; after aging, the roll is unwound and the unwinding process is observed to see if it is smooth and if there is any back-adhesion.

[0140] The test results are shown in Table 1:

[0141] Table 1

[0142]

[0143] Comparing Example 1 with Comparative Example 1, it can be seen that the active Si-H bonds in the polymethylhydrosiloxane molecule can participate in the crosslinking reaction. On the one hand, it enhances the intermolecular bonding force, and its structure, similar to that of the silicone matrix, can be well dissolved in the crosslinking network, reducing the overall hardness of the fireproof composite tape while improving its structural strength, thus giving it superior flexibility. On the other hand, the methyl segments it contains will slightly migrate to the material surface, forming a moderately lubricated interface, which helps to achieve non-destructive peeling between the fireproof release layer and the double-sided adhesive layer, ensuring that the fireproof composite tape adheres tightly and does not lift when wrapped.

[0144] As can be seen from the comparison between Example 1 and Comparative Example 2, hydrogen-terminated polydimethylsiloxane can extend the molecular chain length and optimize the cross-linking network structure by undergoing a chain extension reaction with vinyl-terminated polydimethylsiloxane and silicone resin, thereby significantly improving the toughness of the silicone layer and effectively avoiding the problem of wrinkling caused by insufficient toughness during the winding process of fireproof composite tape.

[0145] Comparing Example 1 and Comparative Example 3, it can be seen that γ-methacryloyloxypropyltrimethoxysilane can modify the surface of inorganic powders in the system, enhance the compatibility between the powders and the silica matrix, and thus improve the apparent strength of the fireproof release layer; at the same time, it can be compatible with SYL-OFF TM 7678 and polymethylhydrosiloxane form a synergistic effect, further optimizing the surface properties of the fireproof release layer and achieving an anti-re-adhesion effect.

[0146] A comparison between Example 1 and Comparative Example 4 shows that SYL-OFF TM During the high-temperature reaction, 7678 can migrate directionally to the surface of the fireproof release layer. Its unique organosilicon molecular structure can effectively reduce the surface energy of the fireproof release layer. Furthermore, this component has a synergistic effect with γ-methacryloyloxypropyltrimethoxysilane and polymethylhydrosiloxane, which can jointly regulate the surface state of the fireproof release layer and ensure that the product does not stick.

[0147] Comparing Example 1 and Comparative Example 5, it can be seen that methyl silicone oil does not participate in the silicone crosslinking reaction. Although it can dissolve in the crosslinking network due to its structure similar to the silicone matrix, it cannot effectively reduce the hardness of the fireproof composite tape to improve its flexibility. It is difficult to meet the requirements of tight wrapping and no lifting, and it is easy to precipitate out of the system during long-term use, resulting in anti-adhesion problems.

[0148] As can be seen from the comparison between Example 1 and Comparative Example 6, although vinyltrimethoxysilane contains reactive vinyl bonds and polymethylhydrosiloxane and SYL-OFF are present in the system, TM 7678 is used to improve the apparent strength and lubricity of the silicone release layer, but this component cannot form an effective synergistic effect with other additives, and it is still difficult to solve the anti-adhesion problem.

[0149] Comparing Example 1 with Comparative Example 7, it was found that when the ratio of low-hydrogen-content side-chain type hydrogen-containing silicone oil to high-hydrogen-content side-chain type hydrogen-containing silicone oil is 1:1, it will lead to an imbalance in the density of the silicone crosslinking network, a significant decrease in the flexibility of the fireproof composite tape, and wrinkling and curling are likely to occur during the winding process, which cannot meet the actual application needs of customers.

[0150] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art should understand that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A high-pressure, high-temperature resistant, insulating, single-layer fireproof composite tape, characterized in that, It includes a double-sided adhesive layer, a fireproof layer, a fiberglass layer, and a fireproof release layer, which are stacked in sequence. The double-sided adhesive layer comprises a low-tack acrylic layer, a PET layer, and a high-tack acrylic layer, with the high-tack acrylic layer located close to the fireproof layer. The side of the double-sided adhesive layer containing the high-tack acrylic layer is the high-tack side, and when this high-tack side is bonded to the fireproof layer, the 180° peel force is 8-12 N / cm. The side of the double-sided adhesive layer containing the low-tack acrylic layer is the low-tack side, and when this low-tack side is bonded to the fireproof release layer, the 180° peel force is 4-7 N / cm. The fireproof layer is formed by curing an organosilicon composition, which comprises, by weight percentage: 27-40% organosilicon, 0.5-3% curing agent, 0.01-0.5% reaction aid, 20-30% flame-retardant filler, and 30-40% inorganic ceramic filler; the organosilicon is selected from one or more of vinyl-terminated polydimethylsiloxane, divinyl-terminated phenylmethylsiloxane, methyl vinyl MQ silicone resin, and methyl-terminated polymethyl vinyl siloxane. The mixture comprises polymethylhydrosiloxane and hydrogen-terminated polydimethylsiloxane; the curing agent includes low-hydrogen-content side-chain hydrogen-containing silicone oil and high-hydrogen-content side-chain hydrogen-containing silicone oil, wherein the low-hydrogen-content side-chain hydrogen-containing silicone oil has a hydrogen content of 0.18-0.75%, the high-hydrogen-content side-chain hydrogen-containing silicone oil has a hydrogen content of 1.0-1.6%, and the mass ratio of the low-hydrogen-content side-chain hydrogen-containing silicone oil to the high-hydrogen-content side-chain hydrogen-containing silicone oil is (8-9):(1-2); the reaction aids include alkynol inhibitors and Pt catalysts; The fire-retardant release layer is formed by curing an organosilicon release composition, which comprises an organosilicon composition and a release aid. The organosilicon release composition contains, by weight percentage: 27-40% organosilicon, 0.5-3% curing agent, 0.01-0.5% reaction aid, 20-30% flame-retardant filler, 30-40% inorganic ceramic filler, and 0.3-1.0% release aid. The organosilicon is selected from one or more of vinyl-terminated polydimethylsiloxane, divinyl-terminated phenylmethylsiloxane, methyl vinyl MQ silicone resin, and methyl-terminated polymethyl vinyl siloxane, as well as polymethyl hydrosiloxane. The mixture comprises alkyl and hydrogen-terminated polydimethylsiloxane; the curing agent includes low-hydrogen-content side-chain hydrogen-containing silicone oil and high-hydrogen-content side-chain hydrogen-containing silicone oil, wherein the low-hydrogen-content side-chain hydrogen-containing silicone oil has a hydrogen content of 0.18-0.75%, the high-hydrogen-content side-chain hydrogen-containing silicone oil has a hydrogen content of 1.0-1.6%, and the mass ratio of the low-hydrogen-content side-chain hydrogen-containing silicone oil to the high-hydrogen-content side-chain hydrogen-containing silicone oil is (8-9):(1-2); the reaction aid includes alkynyl alcohol inhibitor and Pt catalyst; the stripping aid includes γ-methacryloyloxypropyltrimethoxysilane and organosilicon stripping agent, wherein the active ingredient of the organosilicon stripping agent is a vinylsiloxane functional polymer.

2. The high-pressure and high-temperature resistant insulating single-layer fireproof composite tape according to claim 1, characterized in that, The thickness of the double-sided adhesive layer is 0.03-0.10 mm; the thickness of the fireproof layer is 0.03-0.10 mm; the thickness of the glass fiber layer is 0.03-0.20 mm; the thickness of the fireproof release layer is 0.03-0.10 mm; and the thickness of the insulating single-layer fireproof composite tape is 0.20-0.40 mm.

3. The high-pressure and high-temperature resistant insulating single-layer fireproof composite tape according to claim 1, characterized in that, The vinyl-terminated polydimethylsiloxane has a viscosity of 1000-5000 mPa·s, with a vinyl content of 0.2-1.0 wt%; the divinyl-terminated phenylmethylsiloxane has a vinyl content of 0.3-0.8 wt% and a phenyl content of 5-15 wt%; the methyl vinyl MQ silicone resin has a viscosity of 12000-20000 mPa·s, with a vinyl content of 1.2-1.3 wt% and an M / Q ratio of 0.6-1.0; the methyl-terminated polymethylvinylsiloxane has a vinyl content of 0.1-0.5 wt%; the polymethylhydrosiloxane has a viscosity of 20-500 mPa·s, with a hydrogen content of 0.18-1.6 wt%; and the hydrogen-terminated polydimethylsiloxane has a hydrogen content of 0.03-0.40 wt%.

4. The high-pressure and high-temperature resistant insulating single-layer fireproof composite tape according to claim 1, characterized in that, The silicone is vinyl-terminated polydimethylsiloxane, methyl vinyl MQ silicone resin, polymethyl hydrosiloxane, and hydrogen-terminated polydimethylsiloxane; the mass ratio of vinyl-terminated polydimethylsiloxane, methyl vinyl MQ silicone resin, polymethyl hydrosiloxane to hydrogen-terminated polydimethylsiloxane is (8.4-9.5):(0.01-0.5):(0.03-1.0):(0.01-0.5).

5. The high-pressure and high-temperature resistant insulating single-layer fireproof composite tape according to claim 1, characterized in that, The curing agent further includes one or more of methyl hydrogen-containing MQ type silicone resin, bis(2,4-dichlorobenzoyl) peroxide and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane; the methyl hydrogen-containing MQ type silicone resin has a hydrogen content of 0.5-1.5 wt% and an M / Q ratio of 0.6-1.

0.

6. The high-pressure and high-temperature resistant insulating single-layer fireproof composite tape according to claim 1, characterized in that, The alkynol inhibitor is ethynylcyclohexanol and / or 2-methyl-3-butyn-2-ol; the Pt catalyst is a caster platinum catalyst; the mass ratio of the inhibitor to the Pt catalyst is 1:(3-20).

7. The high-pressure and high-temperature resistant insulating single-layer fireproof composite tape according to claim 1, characterized in that, The flame-retardant filler is selected from one or more of aluminum hydroxide, magnesium hydroxide, benzotriazole and carbon black; the inorganic ceramicized filler is selected from one or more of silazane-treated fumed silica, silica powder, borax, boric acid, lithium carbonate, sodium carbonate, sodium nitrate, kaolin, wollastonite, mica powder, fluorite, clay, glass powder, zinc borate, diatomaceous earth, zinc oxide, aluminum oxide and magnesium oxide; the stripping agent also includes dodecyltrimethoxysilane.

8. A method for preparing a high-voltage, high-temperature resistant insulating single-layer fireproof composite tape according to any one of claims 1-7, characterized in that, Includes the following steps: (1) Add organosilicon, inorganic ceramic filler, flame retardant filler, curing agent, alkynol inhibitor and Pt catalyst into a mixer and mix evenly to obtain organosilicon composition; (2) At 80-100 ℃, add silicone, inorganic ceramic filler, release agent and flame retardant filler into a mixer, mix evenly and then cool down to below 40 ℃, add curing agent, alkynol inhibitor and Pt catalyst, mix evenly to obtain silicone release composition. (3) Using glass fiber as a substrate, the silicone composition obtained in step (1) is coated on one side of the substrate to form a fireproof layer; the silicone release composition obtained in step (2) is coated on the other side of the glass fiber to form a fireproof release layer; a double-sided adhesive layer is attached to the side of the fireproof layer away from the glass fiber, and the high-viscosity acrylic adhesive layer of the double-sided adhesive layer is close to the fireproof layer to obtain the high-pressure and high-temperature resistant insulating single-layer fireproof composite tape.

9. The preparation method according to claim 8, characterized in that, In step (3), a release film is pre-attached to the side of the low-tack acrylic adhesive layer of the double-sided adhesive layer away from the PET layer; before winding, the release film is peeled off to expose the low-tack acrylic adhesive layer of the double-sided adhesive layer, and then it is wound up so that it comes into direct contact with the fireproof release layer to obtain the high-pressure and high-temperature resistant insulating single-wrap fireproof composite tape.

10. The application of the high-pressure and high-temperature resistant insulating single-layer fireproof composite tape according to any one of claims 1-7 in new energy vehicles.

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