Orange warning mica tape as well as preparation method and application thereof

Abstract

The invention provides an orange warning mica tape as well as a preparation method and application thereof. The orange warning mica tape comprises an orange organic silicon coating, a first glass fiber reinforced layer, a first organic silicon binder layer, a mica layer, a second organic silicon binder layer and a second glass fiber reinforced layer which are arranged in sequence. According to the orange warning mica tape, specific structural design and material selection are adopted, the orange warning mica tape can have good heat resistance and flame retardance, insulation performance, mechanical performance and bonding performance, performance is stable, the service life is long, and the maintenance-free warning sign effect can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of insulating materials, and particularly relates to an orange warning mica tape, a preparation method thereof, and an application thereof. Background Art

[0002] With the rapid development of the global new energy vehicle, energy storage industry, and wind-solar-hydro-nuclear power generation industry, a large amount of mica tape insulating materials are required for battery busbars, connectors, wires and cables, etc. However, with the increase in voltage and the application of large currents, higher requirements for heat resistance, flame retardancy, fire protection, insulation performance, and longer service life are put forward for mica tape insulating materials. At the same time, in the context of the improvement of the national safety awareness, it is required that all electricity-related hazard sources be pre-warned with obvious visualization effects to prevent the occurrence of electric shock safety accidents.

[0003] Currently, in the fields of new energy vehicles and electrical insulation, mica tape is generally used to wind and wrap conductors, and then a plastic film or heat shrinkable tube is used to wrap the mica tape layer on the outer layer to prevent moisture and improve insulation performance; then a yellow warning tape is pasted on the outer layer or yellow paint is applied. However, the plastic film or tape on the outer layer of mica is non-flame-retardant and has poor heat resistance. When the busbar cable works for a long time, it will heat up, causing the wrapping layer to deform or fade, losing the warning color function, and the moisture-proof performance will also decline. The method of applying yellow paint will bring toxic and harmful solvents, and can only be applied to the exposed parts. After painting, it is necessary to wait for drying. This affects the next installation process, and there are also problems such as paint dripping affecting other components, and the warning effect and moisture-proof insulation performance cannot be guaranteed.

[0004] CN117727492A discloses a low-binder mica tape, which is composed of a reinforcing material layer, a first adhesive layer, a mica paper layer, and a second adhesive layer arranged in sequence. The mica tape improves the problem of poor adhesion between mica tape layers and easy delamination between mica paper and reinforcing materials by adding LNBR 820; by surface-treating the non-reinforced side of the mica paper, the problem of easy powder flying and shedding during its production and use is solved, and the winding processability of the low-binder mica tape is improved. However, the electrical insulation performance, heat resistance, and flame retardancy of the mica tape need to be further improved, and it has no warning function.

[0005] Another example is that CN118398314A discloses a low-binder mica tape, including a reinforcing material layer, an adhesive layer, and a mica paper layer arranged in sequence. The adhesive raw materials of the adhesive layer include epoxy-modified silicone resin, maleic anhydride, a curing agent, a latent accelerator, and a solvent. The adhesive of the low-binder mica tape is made of epoxy-modified silicone resin and microcapsule-type accelerator, etc., and has better heat resistance and better adhesion. However, the electrical insulation strength of the low-binder mica tape is relatively low, and it has no warning function.

[0006] CN118344663A discloses a highly flame-retardant ceramizable plastic composite film and a flexible composite mica tape prepared therefrom. The plastic composite film has a uniform thickness and a smooth surface, and has good flame-retardant, fire-proof, wear-resistant, and heat-resistant stability properties. The mica tape including the plastic composite film has room for improvement in terms of electrical insulation performance and peel strength, and has no warning effect.

[0007] Therefore, it is an urgent problem to be solved in this field to develop a mica material with good heat-resistant flame-retardant performance, insulation performance, mechanical performance, and bonding performance, a long service life, and a warning effect. Summary of the Invention

[0008] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an orange warning mica tape and its preparation method and application. The orange warning mica tape solves the problems in the existing technology that the mica tape cannot have good heat-resistant flame-retardant performance, insulation performance, mechanical performance, and bonding performance at the same time, the mica is prone to powder falling and has no warning effect, and additional warning materials need to be introduced.

[0009] To achieve this purpose, the present invention adopts the following technical solutions:

[0010] In the first aspect, the present invention provides an orange warning mica tape, which includes an orange silicone coating, a first fiberglass reinforcement layer, a first silicone binder layer, a mica layer, a second silicone binder layer, and a second fiberglass reinforcement layer arranged in sequence.

[0011] In the present invention, the orange silicone coating has good compactness, which can improve the moisture-proof performance, electrical insulation performance, and heat-resistant, fire-proof, and flame-retardant performance of the mica tape; it does not fade or crack after long-term heating, ensuring the stability of the mica composite material during long-term high-temperature operation; at the same time, the material of the orange silicone coating has good flexibility and can penetrate into the pores of the fiberglass reinforcement layer and the mica layer during the preparation process, playing a good anchoring role on the mica layer, thereby improving the tensile strength and interlayer bonding force of the mica tape, improving the delamination phenomenon between the mica layer and the fiberglass reinforcement layer, and avoiding the phenomenon of mica powder falling; in addition, by adding pigments to the material of the silicone coating, the mica tape itself has a warning effect, without the need to introduce additional warning materials, with low cost and environmental protection; the orange warning mica tape, through specific structural design and material selection, can have good heat-resistant flame-retardant performance, insulation performance, mechanical performance, and bonding performance at the same time, with stable performance and a long service life, and can achieve the effect of a maintenance-free warning sign.

[0012] Preferably, the thickness of the orange silicone coating is 0.04 - 0.08 mm, for example, it can be 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, etc.

[0013] Preferably, by weight, the slurry of the orange silicone coating comprises 100 parts of a first silicone resin, 1 - 2 parts of a first catalyst, 90 - 110 parts of a first diluent, 8 - 9.3 parts of a pigment, and 0.1 - 0.5 parts of a dispersant.

[0014] In the present invention, 1 - 2 parts of the first catalyst may be, for example, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2.0 parts, etc.; more preferably 1.2 - 1.5 parts.

[0015] In the present invention, 90 - 110 parts of the first diluent may be, for example, 90 parts, 95 parts, 100 parts, 105 parts, 110 parts, etc.; more preferably 95 - 105 parts.

[0016] In the present invention, 8 - 9.3 parts of the pigment may be, for example, 8 parts, 8.2 parts, 8.4 parts, 8.6 parts, 8.9 parts, 9.1 parts, 9.3 parts, etc., and more preferably 8.4 - 9.0 parts.

[0017] In the present invention, 0.1 - 0.5 parts of the dispersant may be, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, etc.

[0018] In the present invention, the slurry of the orange silicone coating adopts a specific formulation, that is, a silicone resin is combined with a specific content of a first diluent and a first catalyst, which helps to form a dense coating. The obtained orange warning mica tape has high electrical strength, tensile strength, and peel strength, while ensuring an appropriate curing speed. If the content of the first diluent is too high, the fluidity of the slurry increases, the solid content decreases, resulting in a decrease in the thickness of the silicone coating, and the enhancement effect of the silicone coating on the orange warning mica tape decreases, leading to a decrease in both electrical strength and mechanical strength. If the content of the first diluent is too low, it is not conducive to the penetration of the slurry into the pores of the glass fiber reinforced layer and the mica layer, resulting in a decrease in the peel strength of the orange warning mica tape. If the content of the first catalyst is too low, the curing speed is slow, and under the same conditions, the curing is incomplete, affecting the electrical strength, tensile strength, and peel strength of the orange warning mica tape, or the curing time needs to be extended, causing waste of resources. If the content of the first catalyst is too high, the curing speed is fast, the pot life of the glue is short, and the cured product is prone to becoming hard and brittle, affecting the performance.

[0019] Preferably, the first silicone resin comprises a methylphenyl silicone resin. Based on the total mass of the methylphenyl silicone resin being 100%, the mass content of methyl in the methylphenyl silicone resin is ≤10%, and may be, for example, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc.; more preferably, the mass content of methyl in the methylphenyl silicone resin is 8 - 10%.

[0020] In the present invention, the solid content of the methylphenyl silicone resin is above 95%, and the content of methyl can be obtained by selecting raw materials.

[0021] In the present invention, the orange silicone coating uses methylphenyl silicone resin, and the methyl content in the methylphenyl silicone resin is within a specific range, so that the obtained orange warning mica tape has high electrical strength, tensile strength and peel strength; if the methyl content is too high, the brittleness of the orange silicone coating is high, resulting in poor flexibility of the mica composite material and a decrease in peel strength; if the methyl content is too low, the hardness and strength of the resin are reduced, and the compactness of the orange silicone coating becomes poor, resulting in a decrease in the electrical strength and tensile strength of the orange warning mica tape.

[0022] Preferably, the first catalyst includes at least one of benzoyl peroxide (BPO), tert-butyl peroxybenzoate (TXC) or dicumyl peroxide (DCP), and more preferably benzoyl peroxide (BPO).

[0023] In the present invention, the first catalyst is preferably a catalyst with high activity and low initiation temperature, which is beneficial to improving the electrical strength, tensile strength and peel strength of the mica composite material; if the activity is low and the initiation temperature is high, under the same conditions, the curing speed is slow, which easily leads to incomplete curing, thereby affecting the electrical strength, tensile strength and peel strength.

[0024] Preferably, the boiling point of the first diluent is 43 - 140 °C, and more preferably 90 - 130 °C.

[0025] In the present invention, when the boiling point of the first diluent is within a specific range, the obtained orange warning mica tape has high electrical strength, tensile strength and peel strength; if the boiling point is too low, the volatilization speed increases, and the viscosity also increases rapidly, resulting in a shortened time for the slurry to penetrate into the mica layer and insufficient penetration, which further leads to a decrease in the peel strength of the orange warning mica tape; if the boiling point is too high, the volatilization speed is slow, which is not conducive to the curing of the resin, and the residue in the mica leads to a decrease in electrical strength and tensile strength.

[0026] Preferably, the first diluent includes at least two of toluene, xylene or methylal; more preferably toluene and xylene.

[0027] Preferably, by weight, the pigment includes 7.5 - 8.5 parts of red heat-resistant pigment and 0.5 - 0.8 parts of yellow heat-resistant pigment, subject to actual color requirements. The red heat-resistant pigment includes iron oxide red; the yellow heat-resistant pigment includes iron oxide yellow and / or chrome yellow. The fineness of the pigment D50 ≤ 3 μm, D90 ≤ 10 μm.

[0028] Preferably, the dispersant includes at least one of BYK-w9010, BYK 9076 or BYK110.

[0029] Preferably, the thicknesses of the first glass fiber reinforced layer and the second glass fiber reinforced layer are each independently 0.04 to 0.06 mm, and may be, for example, 0.04 mm, 0.045 mm, 0.05 mm, 0.055 mm, 0.06 mm, and are further preferably 0.052 to 0.058 mm.

[0030] Preferably, the first glass fiber reinforced layer and the second glass fiber reinforced layer are each independently made of non-alkali glass filaments woven.

[0031] Preferably, the surface densities of the first glass fiber reinforced layer and the second glass fiber reinforced layer are each independently 40 to 60 g / m 2 , for example, may be 40 g / m 2 , 45 g / m 2 , 50 g / m 2 , 55 g / m 2 , 60 g / m 2 .

[0032] Preferably, the first glass fiber reinforced layer and the second glass fiber reinforced layer each independently have a mesh structure, and the size of the mesh structure is 0.8 to 1.2 mm, and may be, for example, 0.8 mm, 0.85 mm, 0.90 mm, 0.95 mm, 1.00 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, etc.; more preferably 0.95 to 1.05 mm.

[0033] Preferably, the thicknesses of the first silicone binder layer and the second silicone binder layer are each independently 0.01 to 0.02 mm.

[0034] Preferably, based on parts by weight, the slurry of the first silicone binder layer or the slurry of the second silicone binder layer includes 100 parts of second silicone resin, 1.3 to 1.7 parts of second catalyst, 90 to 110 parts of second diluent, and 0.3 to 0.7 parts of coupling agent.

[0035] In the present invention, 1.3 to 1.7 parts of the second catalyst, for example, may be 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, etc.

[0036] In the present invention, 90 to 110 parts of the second diluent, for example, may be 90 parts, 95 parts, 100 parts, 105 parts, 110 parts, etc.

[0037] In the present invention, 0.3 to 0.7 parts of the coupling agent, for example, may be 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, etc.

[0038] Preferably, the second silicone resin comprises a phenyl silicone resin, wherein the mass content of silicon in the phenyl silicone resin is 30-35%, such as 30%, 31%, 32%, 33%, 34%, 35%, etc.; the viscosity of the phenyl silicone resin under normal temperature conditions is 3000-5000 mPas; the solid content of the phenyl silicone resin is more than 95%.

[0039] Preferably, the second catalyst comprises benzoyl peroxide and / or tert-butyl perbenzoate.

[0040] Preferably, the second diluent comprises toluene and / or methanol.

[0041] Preferably, the coupling agent is a silane coupling agent.

[0042] In the present invention, the silane coupling agent includes but is not limited to γ-(2,3-epoxypropoxy)propyltrimethoxysilane (A-187 / KH560).

[0043] Preferably, the thickness of the mica layer is 0.09-0.12 mm, such as 0.09 mm, 0.095 mm, 0.10 mm, 0.105 mm, 0.11 mm, 0.115 mm, 0.12 mm, etc.; more preferably 0.095-0.115 mm.

[0044] Preferably, the mica layer comprises mica paper; the surface density of the mica layer is 160-170 g / m 2 , such as 160 g / m 2 , 162 g / m 2 , 164 g / m 2 , 166 g / m 2 , 168 g / m 2 , 170 g / m 2 etc.; the tensile strength of the mica layer ≥ 1.5 N / cm, more preferably 2.0-4.0 N / cm, etc.

[0045] In the present invention, the mica paper is made by mechanical pulping using uncalcined muscovite or phlogopite as raw materials.

[0046] In a second aspect, the present invention provides a method for preparing the orange warning mica tape according to the first aspect, the preparation method comprising the following steps:

[0047] Stacking an orange silicone coating, a first glass fiber reinforced layer, a first silicone binder layer, a mica layer, a second silicone binder layer, and a second glass fiber reinforced layer in sequence, and curing and molding to obtain the orange warning mica tape.

[0048] Preferably, before the lamination, it further includes the step of pre-baking the first fiberglass reinforced layer, mica layer and second fiberglass reinforced layer.

[0049] Preferably, the temperature of the pre-baking is 80-90°C, and the time is 2-3 min. For example, it can be 90°C * 3 min, 85°C * 2.5 min, 90°C * 2 min, etc.

[0050] Preferably, the curing and forming includes curing and forming in a first stage and a second stage.

[0051] Preferably, the temperature of the first stage is 80-90°C, and the time is 40-100 s. For example, it can be 80°C * 100 s, 85°C * 70 s, 90°C * 40 s, etc.

[0052] Preferably, the temperature of the second stage is 120-130°C, and the time is 60-120 s. For example, it can be 120°C * 120 s, 125°C * 90 s, 130°C * 60 s, etc.

[0053] It should be noted that, by way of example, in the pre-baking, 90°C * 3 min means pre-baking for 3 min at 90°C; in the curing process, 80°C * 100 s means curing for 100 s at 80°C.

[0054] In the present invention, the temperature and time of the curing and forming are within a specific range, which can not only ensure that the orange warning mica tape has high electrical strength, tensile strength and peel strength, but also ensure that the orange warning mica tape has good flexibility; if the temperature of the curing and forming is too high or the time is too long, the flexibility of the orange warning mica tape becomes poor; if the temperature of the curing and forming is too low or the time is too short, the curing is incomplete, resulting in the electrical strength, tensile strength and peel strength of the orange warning mica tape.

[0055] In the present invention, the equipment for lamination includes a sizing machine; specifically, the preparation method includes: pulling the first fiberglass reinforced layer, mica layer and second fiberglass reinforced layer through the sizing machine, passing through a pre-baking tunnel furnace, and pre-baking for 2-3 min at 80-90°C; then bonding one side of the second fiberglass reinforced layer and the mica layer through a first sizing roller to obtain a mica layer, a second silicone binder layer and a second fiberglass reinforced layer stacked in sequence; then bonding the other side of the first fiberglass reinforced layer and the mica layer through a second sizing roller to obtain a first fiberglass reinforced layer, a first silicone binder layer, a mica layer, a second silicone binder layer and a second fiberglass reinforced layer stacked in sequence; then coating a slurry of an orange silicone coating on the surface of the first fiberglass reinforced layer away from the mica layer through a third sizing roller, and then entering the tunnel furnace drying channel as a whole to remove the solvent and the glue layer, curing and forming, winding and slitting to obtain the orange warning mica tape.

[0056] In the present invention, the preparation method is integrally formed, and is integrally formed through pre-drying, primary sizing, secondary sizing, coating, and baking once, with high production efficiency. It can also reduce the post-treatment process after winding the mica tape, improving the production efficiency and application safety.

[0057] In a third aspect, the present invention provides a flame-retardant warning product, and the flame-retardant warning product includes the orange warning mica tape described in the first aspect.

[0058] Preferably, the flame-retardant warning product includes an orange flame-retardant warning product.

[0059] Preferably, the shape of the flame-retardant warning product includes a strip shape.

[0060] The numerical ranges described in the present invention not only include the above-listed point values, but also include any point values between the above numerical ranges that are not listed. Due to space limitations and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the range.

[0061] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0062] The orange warning mica tape provided by the present invention includes an orange silicone coating, a first fiberglass reinforcement layer, a first silicone binder layer, a mica layer, a second silicone binder layer, and a second fiberglass reinforcement layer arranged in sequence; through the adoption of a specific structural design and material selection, the obtained orange warning mica tape has good heat resistance, flame retardancy, insulation performance, mechanical performance, and bonding performance, and has stable performance, long service life, and can achieve a maintenance-free warning sign effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a schematic structural diagram of the orange warning mica tape provided by an embodiment of the present invention;

[0064] Among them, 1 - orange silicone coating; 2 - first fiberglass reinforcement layer; 3 - first silicone binder layer; 4 - mica layer; 5 - second silicone binder layer; 6 - second fiberglass reinforcement layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0065] The technical solutions of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0066] The materials used in the present invention can all be obtained by purchasing commercially or prepared by conventional methods; unless otherwise specified, the materials used in the present invention are as follows:

[0067] Methyl phenyl silicone resin 1: The methyl content is 8%, purchased from Hubei Longsheng Xinsiha, model SH-9602.

[0068] Methylphenyl silicone resin 2: The methyl content is 10%, purchased from Hubei Longsheng Xinsihai, model SH-9603.

[0069] Methylphenyl silicone resin 3: The methyl content is 3%, purchased from Hubei Longsheng Xinsihai, model SH-9601.

[0070] Phenyl silicone resin: The silicon content is 30-35%, the solid content is ≥95%, the viscosity is 3000-5000 mpas, purchased from Hubei Longsheng Xinsihai.

[0071] Fiberglass mesh cloth: Made of non-alkali glass fiber woven, the surface density is 50 g / m 2 , the mesh size is 1.0 mm, and the thickness is 0.05 mm.

[0072] Mica paper: McCa P506, made by mechanical pulping with uncalcined phlogopite as raw material, the surface density of the mica paper is 160-168 g / m 2 , the thickness is 0.092-0.113 mm, and the tensile strength is ≥1.5 N / cm.

[0073] Example 1

[0074] This example provides an orange warning mica tape, and its structural schematic diagram is as Figure 1 shown, including an orange silicone coating 1, a first fiberglass reinforced layer 2 (fiberglass mesh cloth), a first silicone binder layer 3, a mica layer 4 (mica paper), a second silicone binder layer 5 and a second fiberglass reinforced layer 6 (fiberglass mesh cloth) arranged in sequence; the thickness of the silicone coating is 0.05 mm, and the thicknesses of the first silicone binder layer and the second silicone binder layer are both 0.01 mm.

[0075] By weight, the slurry of the orange silicone coating includes 100 parts of methylphenyl silicone resin 1 with a methyl content of 8%, 1.0 part of catalyst BPO, 45 parts of diluent toluene, 45 parts of diluent xylene, 8 parts of red iron oxide pigment, 0.8 part of yellow iron oxide pigment and 0.2 part of dispersant BYK w9010; by weight, the slurries of the first silicone binder layer and the second silicone binder layer both include 100 parts of phenyl silicone resin, 1.3 parts of catalyst BPO, 90 parts of diluent toluene and 0.4 part of coupling agent γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH560).

[0076] This example provides a preparation method of an orange warning mica tape, which specifically includes the following steps:

[0077] (1) two layers of glass fiber mesh cloth and mica paper are pulled through a mica tape gluing machine, and then passed through a pre-baking tunnel furnace and baked at a temperature of 85° C. for 2 minutes; then a layer of glass fiber mesh cloth and mica paper are bonded by a first gluing roller using the slurry of the second silicone adhesive layer; and a mica layer 4, a second silicone adhesive layer 5, and a second glass fiber reinforcement layer 6 are obtained, which are stacked in sequence;

[0078] (2) bonding another layer of glass fiber mesh cloth and the other side of mica paper with the slurry of the first organic silicone adhesive layer by a second adhesive roller to obtain a first glass fiber reinforced layer 2, a first organic silicone adhesive layer 3, a mica layer 4, a second organic silicone adhesive layer 5 and a second glass fiber reinforced layer 6 which are stacked in sequence;

[0079] (3) The orange silicone coating slurry is applied to the surface of the first glass fiber reinforcement layer 2 away from the mica layer by a third glue roller, and then the whole is put into a tunnel oven for curing and forming through the first stage and the second stage; wherein, the first stage is cured at a temperature of 80°C for 100s; the second stage is cured at a temperature of 130°C for 60s; the solvent is removed, and the tape is rolled and cut to obtain the orange warning mica tape.

[0080] Example 2

[0081] This embodiment provides an orange warning mica tape, which differs from Embodiment 1 only in that, in the slurry of the orange silicone coating, the number of BPO is 1.35 parts, the number of toluene is 50 parts, and the number of xylene is 50 parts; in the slurry of the first silicone adhesive layer and the slurry of the second silicone adhesive layer, the number of BPO is 1.5 parts, and the number of toluene is 100 parts; other materials, amounts, structures and preparation methods are the same as those in Embodiment 1.

[0082] Example 3

[0083] This embodiment provides an orange warning mica tape, which differs from Embodiment 1 only in that, in the slurry of the orange silicone coating, the number of BPO is 1.7 parts, the number of toluene is 55 parts, and the number of xylene is 55 parts; in the slurry of the first silicone adhesive layer and the slurry of the second silicone adhesive layer, the number of BPO is 1.7 parts, and the number of toluene is 110 parts; other materials, amounts, structures and preparation methods are the same as those in Embodiment 1.

[0084] Example 4

[0085] This embodiment provides an orange warning mica tape, which differs from Embodiment 2 only in that, in the slurry of the orange silicone coating, the silicone resin is 100 parts of methylphenyl silicone resin 2 with a methyl content of 10%, and other materials, amounts, structures and preparation methods are the same as those in Embodiment 2.

[0086] Example 5

[0087] This example provides an orange warning mica tape, the difference from Example 2 is only that in the slurry of the orange silicone coating, 1.35 parts of catalyst BPO are replaced by 1.35 parts of TXC. In the preparation method, the first stage is to cure for 100 s at a temperature of 90 °C; the second stage is to cure for 100 s at a temperature of 130 °C; other materials, dosages, structures, and preparation methods are the same as those in Example 2.

[0088] Example 6

[0089] This example provides an orange warning mica tape, the difference from Example 2 is only that in the slurry of the orange silicone coating, the silicone resin uses 100 parts of methyl phenyl silicone resin with 3% methyl content (purchased from Hubei Longsheng Xinsiha). Other materials, dosages, structures, and preparation methods are the same as those in Example 2.

[0090] Example 7

[0091] This example provides an orange warning mica tape, the difference from Example 2 is only that in the slurry of the orange silicone coating, the diluent uses 50 parts of xylene and 50 parts of methylal; in the slurries of the first silicone binder layer and the second silicone binder layer, the diluent both uses 100 parts of methanol; other materials, dosages, structures, and preparation methods are the same as those in Example 2.

[0092] Example 8

[0093] This example provides an orange warning mica tape, the difference from Example 2 is only that the first stage is to cure for 100 s at a temperature of 90 °C; the second stage is to cure for 100 s at a temperature of 130 °C; other materials, dosages, structures, and preparation methods are the same as those in Example 2.

[0094] Example 9

[0095] This example provides an orange warning mica tape, the difference from Example 2 is only that the first stage is to cure for 40 s at a temperature of 80 °C; the second stage is to cure for 60 s at a temperature of 120 °C; other materials, dosages, structures, and preparation methods are the same as those in Example 2.

[0096] Comparative Example 1

[0097] This comparative example provides an orange warning mica tape, which is only different from Example 2 in that in the slurry of the orange silicone coating, the methylphenyl silicone resin and the catalyst are replaced by a flexible epoxy resin curing system (i.e., 100 parts of methylphenyl silicone resin and 1.0 part of BPO are replaced by 100 parts of Kunshan Nan Ya epoxy resin NPEL128, 48 parts of modified polyetheramine R-3310 from Guangdong Ruiqi Chemical Industry, and 0.5 part of the catalyst resorcinol, and the catalyst is purchased from Zibo Shuanghe Chemical Industry); the difference between the slurry of the first silicone binder layer and the slurry of the second silicone binder layer is that the phenyl silicone resin and the catalyst are replaced by a flexible epoxy resin curing system (i.e., 100 parts of phenyl silicone resin and 1.3 parts of BPO are replaced by 100 parts of Kunshan Nan Ya epoxy resin NPEL128, 48 parts of modified polyetheramine R-3310 from Guangdong Ruiqi Chemical Industry, and 0.5 part of the catalyst resorcinol). Other materials, dosages, structures, and preparation methods are the same as those in Example 2.

[0098] Performance Test

[0099] The orange warning mica tapes provided in Examples 1 to 9 and Comparative Example 1 were subjected to the following performance tests.

[0100] (1) Electrical strength: Tested in accordance with GB / T 1408.1-2016.

[0101] (2) Tensile strength: Tested in accordance with GB / T 1040.2-2022.

[0102] (3) T peel strength: Tested in accordance with GB / T 2791-1995.

[0103] (4) Flame retardant rating: Tested in accordance with the UL94 standard.

[0104] (5) Flexibility: Tested in accordance with the bending stiffness of GB / T 22364-2018.

[0105] The specific test results are shown in Table 1:

[0106] Table 1

[0107]

[0108] Combining Examples 1-5 and Examples 7-9 and combining with Table 1, it can be seen that the orange warning mica tape provided by the present invention has an electrical strength ≥ 12.8 KV / mm, a tensile strength ≥ 7.0 MPa, a T peel strength ≥ 3.3 N / cm, a flame retardant rating reaching V0 level, and a bending stiffness between 2.3-5.6 mN·m.

[0109] Combined with Examples 1-3, 5 and Table 1, it can be seen that the change in the dosage of initiator BPO can effectively adjust the properties of the cured product, balance the tensile strength and bending stiffness (flexibility) of the orange warning mica tape, and have good electrical insulation performance and mechanical strength. In this system, the catalytic activity of initiator TXC is lower than that of BPO. Even if the curing temperature is increased and the curing time is extended, the electrical strength and mechanical strength of the cured product of the orange warning mica tape are still lower than those of the product using the same amount of BPO.

[0110] Combined with Examples 2, 4, 6, Comparative Example 1 and Table 1, it can be seen that in the slurry of the orange silicone coating, methylphenyl silicone resins with different methyl contents have an obvious impact on the flexibility of the orange warning mica tape. The lower the methyl content, the lower the bending stiffness of the resin cured product, the better the flexibility, and the lower the mechanical strength; the higher the methyl content, the higher the bending stiffness of the resin cured product, the lower the flexibility, and the higher the mechanical strength. When a flexible epoxy resin is used as the binder of the coating, although the electrical insulation performance and mechanical strength of the prepared orange warning mica tape can meet the requirements, the flame retardant performance drops significantly. Considering the actual application scenarios of the mica tape, the lamination winding process is usually adopted and it is required to be flame retardant and fireproof, and it is necessary to balance the mechanical strength and flexibility. Therefore, methylphenyl silicone resin with a methyl content of 8-10% is preferably used.

[0111] Combined with Example 2, Example 7 and Table 1, it can be seen that the ratio and dosage of the solvent also have an impact on the properties of the orange warning mica tape. Under the same baking conditions, when using a low-boiling mixed solvent, due to too fast volatilization, bubbles may be generated between the coating and the mica interlayer, resulting in delamination, thus reducing the electrical insulation performance and mechanical strength; when using a high-boiling mixed solvent, due to the slower volatilization of the solvent, there may be solvent residues in the orange warning mica tape under the same baking temperature and time, resulting in a decrease in the electrical insulation performance and mechanical strength, and environmental problems may also occur. Therefore, a mixed solvent with a boiling point of 90-120 °C is preferably used.

[0112] Combined with Example 2, Examples 8-9 and Table 1, it can be seen that when using the same coating and binder formula, there are obvious differences in the electrical insulation performance and mechanical properties of the orange warning mica tape cured at low temperature for a long time and at high temperature for a short time. Therefore, the formula needs to be matched with a suitable curing process to obtain excellent product performance.

[0113] In summary, the orange warning mica tape provided by the present invention adopts a specific structural design, and strictly controls the composition and ratio of the raw materials of the orange silicone coating and the silicone binder layer. In combination with the glass fiber reinforced layer and the mica layer, the obtained orange warning mica tape has good flame retardancy, electrical insulation performance and mechanical strength, can play a good role in isolating and moisture-proofing the mica layer, improves the delamination and powder falling problems of the ordinary mica layer, has good stability, extends the service life of the orange warning mica tape, and broadens the application scenarios of mica composite materials.

[0114] The applicant declares that the above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. An orange warning mica tape, characterized in that, The orange warning mica tape includes an orange silicone coating, a first fiberglass reinforcement layer, a first silicone binder layer, a mica layer, a second silicone binder layer, and a second fiberglass reinforcement layer, which are arranged in sequence.

2. The orange warning mica tape according to claim 1, characterized in that, The thickness of the orange silicone coating is 0.04 - 0.08 mm; Preferably, by weight, the slurry of the orange silicone coating includes 100 parts of a first silicone resin, 1 - 2 parts of a first catalyst, 90 - 110 parts of a first diluent, 8.0 - 9.3 parts of a pigment, and 0.1 - 0.5 parts of a dispersant; Preferably, the first silicone resin includes a methylphenyl silicone resin. Based on the total mass of the methylphenyl silicone resin being 100%, the mass content of methyl in the methylphenyl silicone resin is ≤10%, and more preferably, the mass content of methyl is 8 - 10%; Preferably, the first catalyst includes at least one of benzoyl peroxide, tert-butyl perbenzoate, or dicumyl peroxide; Preferably, the boiling point of the first diluent is 43 - 140 °C, and more preferably, it is 90 - 130 °C; Preferably, the first diluent includes at least two of toluene, xylene, or methylal; Preferably, by weight, the pigment includes 7.5 - 8.5 parts of a red heat-resistant pigment and 0.5 - 0.8 parts of a yellow heat-resistant pigment; the red heat-resistant pigment includes iron oxide red; the yellow heat-resistant pigment includes iron oxide yellow and / or chrome yellow; Preferably, the dispersant includes at least one of BYK w9010, BYK 9076, or BYK 110.

3. The orange warning mica tape according to claim 1 or 2, characterized in that, The thicknesses of the first fiberglass reinforcement layer and the second fiberglass reinforcement layer are each independently 0.04 - 0.06 mm, and further preferably 0.052 - 0.058 mm; Preferably, the first fiberglass reinforcement layer and the second fiberglass reinforcement layer are each independently woven from alkali-free glass filaments; Preferably, the areal density of the first glass fiber reinforced layer and the second glass fiber reinforced layer are each independently 40 to 60 g / m 2 ; Preferably, the first fiberglass reinforcement layer and the second fiberglass reinforcement layer each independently have a mesh structure, and the size of the mesh structure is 0.8 - 1.2 mm.

4. The orange warning mica tape according to any one of claims 1 to 3, characterized in that, The thicknesses of the first silicone binder layer and the second silicone binder layer are each independently 0.01 - 0.02 mm; Preferably, by weight, the slurry of the first silicone binder layer or the slurry of the second silicone binder layer includes 100 parts of a second silicone resin, 1.3 - 1.7 parts of a second catalyst, 90 - 110 parts of a second diluent, and 0.3 - 0.7 parts of a coupling agent; Preferably, the second silicone resin includes a phenyl silicone resin; the mass content of silicon in the phenyl silicone resin is 30 - 35%; the viscosity of the phenyl silicone resin under normal temperature conditions is 3000 - 5000 maps; Preferably, the second catalyst includes benzoyl peroxide and / or tert-butyl perbenzoate; Preferably, the second diluent includes toluene and / or methanol; Preferably, the coupling agent is a silane coupling agent, and the silane coupling agent includes γ-glycidoxypropyltrimethoxysilane.

5. The orange warning mica tape according to any one of claims 1 to 4, characterized in that, The thickness of the mica layer is 0.09 - 0.12 mm, and further preferably 0.092 - 0.113 mm; Preferably, the mica layer includes mica paper; Preferably, the surface density of the mica layer is 160-170 g / m 2 ; the tensile strength of the mica layer is ≥1.5 N / cm.

6. A method for preparing the orange warning mica tape according to any one of claims 1 to 5, characterized in that, The preparation method includes the following steps: Stack the orange silicone coating, the first fiberglass reinforcement layer, the first silicone binder layer, the mica layer, the second silicone binder layer and the second fiberglass reinforcement layer in sequence, and cure and mold to obtain the orange warning mica tape.

7. The preparation method according to claim 6, characterized in that, Before the stacking, it further includes the step of pre-baking the first fiberglass reinforcement layer, the mica layer and the second fiberglass reinforcement layer; Preferably, the temperature of the pre-baking is 80-90 °C and the time is 2-3 min.

8. The preparation method according to claim 6 or 7, characterized in that, The curing and molding includes curing and molding in a first stage and a second stage; Preferably, the temperature of the first stage is 80-90 °C and the time is 40-100 s; Preferably, the temperature of the second stage is 120-130 °C and the time is 60-120 s.

9. A flame-retardant insulating warning product, characterized in that, The flame-retardant and insulating warning product includes the orange warning mica tape according to any one of claims 1-5.

10. The flame-retardant insulating warning article according to claim 9, wherein, The flame-retardant and insulating warning product includes an orange flame-retardant and insulating warning product; Preferably, the shape of the flame-retardant and insulating warning product includes a strip shape.

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