CN116313229A - High-heat-conductivity multi-glue epoxy glass fiber powder mica tape and manufacturing method thereof - Google Patents
High-heat-conductivity multi-glue epoxy glass fiber powder mica tape and manufacturing method thereof Download PDFInfo
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- CN116313229A CN116313229A CN202310275297.1A CN202310275297A CN116313229A CN 116313229 A CN116313229 A CN 116313229A CN 202310275297 A CN202310275297 A CN 202310275297A CN 116313229 A CN116313229 A CN 116313229A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/02—Drying; Impregnating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/30—Windings characterised by the insulating material
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
The invention belongs to the technical field of high-voltage motor insulation, and discloses a high-heat-conductivity multi-glue epoxy glass fiber powder mica tape and a manufacturing method thereof. The high-heat-conductivity multi-glue epoxy glass fiber powder mica tape is formed by compounding a glass fiber cloth reinforcing material layer, an adhesive material layer and a high-heat-conductivity mica paper layer, and the manufacturing method comprises the following steps of: 1) The high-heat-conductivity mica paper is prepared by mixing high-heat-conductivity filler and modified bisphenol A epoxy resin to prepare rubber powder, and scattering the rubber powder on the mica paper to obtain the high-heat-conductivity mica paper through baking; 2) Dipping the glass fiber cloth with an adhesive material, and compounding mica paper with high heat conduction powder; 3) Baking; 4) Cooling to roll, and cutting to obtain mica tape. The high-heat-conductivity multi-glue epoxy glass fiber powder mica tape manufactured by the invention has good binding process performance, and the mica tape is soft, is in fit and does not delaminate. The stator bar prepared by the high-heat-conductivity multi-glue epoxy glass fiber mica tape can reach international advanced level in various technical indexes.
Description
Technical Field
The invention belongs to the technical field of high-voltage motor insulation, and particularly relates to a high-heat-conductivity multi-glue epoxy glass fiber powder mica tape and a manufacturing method thereof.
Background
The large and medium-sized generator is a power source for national economic development, the heat resistance level of the insulating material is continuously improved along with the continuous increase of the generator capacity, the insulation is developed from the insulation of the class A (90 ℃) of 50 to 60 years to the insulation of the class B (130 ℃) of 70 to 80 years, the insulation of the class F (155 ℃) is developed at the end of 80 years, and the improvement of each heat resistance level is the structural change of a field of insulating material, but the heat conductivity of the insulating material is not improved all the time. After the main insulation heat conduction performance of the stator winding is improved, the capacity of the unit can be further improved on the basis of keeping the volume, rated voltage and temperature rise of the motor unchanged, and the economic and technical indexes of the whole machine are improved, so that the main insulation material of the generator has new development requirements, and the heat conduction performance of the main insulation material of the stator winding is urgently required to be improved. In addition, the running time of the generator set of a plurality of power plants is about to or reaches the service life, the volume, rated voltage and main insulation thickness of a stator are kept unchanged when the generator set is updated and reformed, the capacity of the generator set is improved by utilizing high heat conduction (High thermal conductive, HTC) insulation energy, the cost for reforming the generator set is reduced, the economic benefit of the generator set is improved, and therefore the HTC insulation has wide market prospect in the aspects of capacity-increasing and reformation of the old generator set.
There are two insulating systems internationally, one is VPI (Vacuum Pressure Impregnating) vacuum impregnated insulating system and the other is multi-gel molded insulating system. The high heat conduction insulating material of the VPI insulating system has been remarkably researched and applied to a prototype of a large-scale air-cooled or hydrogen-cooled generator. Because the multi-glue molding insulation system is widely applied, the research of the high-heat-conductivity multi-glue main insulation material is started in the last 20 th century, and the research history is short, but the universities, enterprises and scientific research units involved in the direction are more. The multi-glue main insulation structure of the large motor stator bar is formed by compounding an epoxy tung anhydride adhesive, mica paper and glass fiber cloth, wherein the heat conductivity coefficients of the adhesive, the mica and the glass fiber cloth are respectively 0.17W/(m.k) to 0.22W/(m.k), 0.3W/(m.k) to 0.6W/(m.k) and 0.8W/(m.k) to 1.2W/(m.k), and most researchers are mainly focused on improving the heat conductivity of the insulation adhesive because the heat conductivity coefficient of the adhesive is the lowest. In 1997, the institute of electrical appliance science, the application unit, the insulating material factory and the cooperation unit began to combine and stand research, and the focus of the research is to firstly manufacture high-heat-conductivity adhesive, and then compound mica paper and glass fiber cloth together by using the high-heat-conductivity adhesive to manufacture the high-heat-conductivity multi-rubber powder mica tape. In the production process from the three-in-one common multi-rubber mica tape to the four-in-one high-heat-conductivity multi-rubber mica tape, a series of problems are brought to the development and production of the mica tape and the insulating hot-pressing curing forming process due to the addition of the high-heat-conductivity filler, wherein the fundamental problems (the mica content in the mica tape is reduced) are not solved all the time, and the development for more than 20 years is not applied all the time.
In view of the fact that some enterprises have developed low-glue VPI high-heat-conductivity insulating materials, but are not suitable for multi-glue molding insulating systems, development of high-heat-conductivity multi-glue insulating materials has reached an unprecedented step.
Disclosure of Invention
The invention aims to provide a manufacturing method of a high-heat-conductivity multi-glue epoxy glass fiber mica tape, which aims to ensure stable main insulation electrical performance of a motor stator bar and improve heat conduction performance of the motor stator bar, and solves the problems of low electrical performance and poor binding process existing in the research of high-heat-conductivity insulating materials at present. The technical scheme of the invention is as follows: the high-heat-conductivity multi-glue epoxy glass fiber mica tape is formed by compounding a glass fiber cloth layer, an adhesive material layer and a high-heat-conductivity powder mica paper layer; the glass fiber cloth in the glass fiber cloth layer is electrical alkali-free glass fiber cloth, the bonding material of the bonding material layer is any one of epoxy tung oil anhydride resin, epoxy tung oil anhydride resin and epoxy phenolic resin, the material of the high heat conduction powder mica paper layer is calcined high voltage muscovite paper, and the mica ration is 100g/m 2 ～200g/m 2 Between them.
The manufacturing method of the high-heat-conductivity multi-glue epoxy glass fiber powder mica tape is characterized by comprising the following steps of:
s1, carrying out surface activation treatment on a high-heat-conductivity filler, preparing a solution from a surface activator and a solvent, then adding the high-heat-conductivity filler, stirring for 10-30 min, and drying the mixed solution at 120 ℃ to obtain the surface-activated high-heat-conductivity filler; wherein the high heat conduction filler is composed of BN, alN, si 3 N 4 、Al 2 O 3 、MgO、ZnO、SrTiO 3 、TiO 2 、SiO 2 And in BeOOne or two kinds of components;
s2, after surface activation treatment of the high-heat-conductivity filler, uniformly mixing the high-heat-conductivity filler with modified bisphenol A epoxy resin, wherein the solid content of the epoxy resin is 5% -10%, and freezing and crushing the mixed solution to obtain rubber powder, wherein the softening point of the rubber powder is 50 ℃ -95 ℃; unreeling mica paper, and uniformly scattering rubber powder on one surface of the unreeled mica paper by a powder scattering machine; the mica paper after the glue powder is spread is sent into a first drying tunnel to be baked to prepare the high heat conduction mica paper, the baking temperature is 120-130 ℃, and the baking time is 3-5 min;
s3, hanging a bonding material on the glass fiber cloth, then compounding the bonding material with high-heat-conductivity mica paper to form a semi-finished product, and putting the semi-finished product into a second drying tunnel to be dried at 110-120 ℃ for 3-5 min to obtain the high-heat-conductivity multi-glue epoxy glass fiber mica tape;
s4, the main insulation heat conductivity of the stator bar manufactured by the high heat conduction multi-glue epoxy glass fiber mica tape is not less than 0.35W/(m) -1 k -1 )。
In the above method for manufacturing the high thermal conductivity multi-glue epoxy glass fiber mica tape, in the step S1, the particle size of the high thermal conductivity filler is 0.1 μm-10 μm, and the particles are composed of particles with single particle size or multiple particle sizes.
In the method for manufacturing the high-heat-conductivity multi-glue epoxy glass fiber mica tape, in the step S2, the using amount of the glue powder is 5g/m 2 ～25g/m 2 。
In the method for manufacturing the high-heat-conductivity multi-glue epoxy glass fiber mica tape, the thickness of the glass fiber cloth layer is 0.020-0.030 mm, and the mass per unit area is 15-50g/m 2 。
In the manufacturing method of the high-heat-conductivity multi-glue epoxy glass fiber mica tape, the thickness of the high-heat-conductivity mica paper layer is 0.08-0.12 mm.
In the method for manufacturing the high-heat-conductivity multi-glue epoxy glass fiber powder mica tape, the high-heat-conductivity multi-glue epoxy glass fiber powder mica tape comprises two glass fiber cloth layers, and the high-heat-conductivity mica paper layer is positioned between the two glass fiber cloth layers.
In the method for manufacturing the high-heat-conductivity multi-glue epoxy glass fiber powder mica tape, the high-heat-conductivity multi-glue epoxy glass fiber powder mica tape comprises a layer of glass fiber cloth layer, and the glass fiber cloth layer is adhered to one side of the high-heat-conductivity mica paper layer with glue powder.
Compared with the prior art, the invention has the beneficial effects that:
the invention carefully summarizes the problems in the research of the high heat conduction insulating material and finds out the solving measures. According to the previous research direction, the mica paper and the glass fiber cloth are bonded after the high heat conduction filler is added into the adhesive, the amount of the adhesive in the mica tape is obviously smaller, the adhesive is suitable for being developed into a low-adhesive high heat conduction insulating material, and part of enterprises are adopting the method to manufacture the high heat conduction VPI mica tape. The research of the multi-glue high-heat-conductivity insulating material also has the fundamental problem that the mica tape is thickened after the high-heat-conductivity filler is added, and the thickness of mica paper is not changed, so that the reduction of the mica content (mica is the material which plays a main electric property in the insulating material) leads to the reduction of the insulation breakdown strength and the electric aging resistance.
The high-heat-conductivity insulating material developed by the invention solves the problem of reduction of the mica content in high-heat-conductivity insulation, ensures that the high-heat-conductivity insulating material not only has good heat conductivity but also has good electrical property, for example, the insulating heat conductivity of a wire rod is not less than 0.35W/(m.k), and the dielectric loss value tan delta 0.2U of the wire rod N (U N Rated voltage of the wire rod) < 1.0%, tan delta 0.6U N -tanδ0.2U N Less than 0.5%, thermal state dielectric loss (0.6U N 155 ℃) is less than 5.0 percent, and the breakdown voltage of the stator coil is more than 5.5U N Stator coil 2U N The electrical aging life is more than 1000h and 3U N The electrical aging life is more than 10 hours. The main insulation heat conductivity of the stator bar manufactured by the high heat conduction multi-glue epoxy glass fiber mica tape is not less than 0.35W/(m.k).
The invention can be popularized to main insulation structures of thermal power, hydroelectric power or nuclear power stator bars with higher withstand voltage levels of 24kV and above, has wide application prospect, and lays a reliable technical foundation for manufacturing VPI stator coils of water, electricity, power and power millions and nuclear power millions.
Drawings
Fig. 1 is a schematic diagram of a high thermal conductivity multi-glue epoxy glass fiber powder mica tape structure of two layers of glass fiber cloth.
Fig. 2 is a schematic structural diagram of a high thermal conductivity multi-glue epoxy glass fiber mica tape of a layer of glass fiber cloth.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, which illustrate but do not limit the invention.
The high heat conduction multi-glue epoxy glass fiber powder mica tape prepared by the embodiment is formed by compounding a glass fiber cloth layer 1, an adhesive material layer 2 and a high heat conduction powder mica paper layer 3, as shown in fig. 1 and 2: the glass fiber cloth in the glass fiber cloth layer 1 is electrician alkali-free glass fiber cloth; the material of the high heat conduction powder mica paper layer 3 is calcined high voltage muscovite paper, and the mica ration is 100g/m 2 ～200g/m 2 Between them; the bonding material of the bonding material layer 2 is any one of epoxy tung oil anhydride resin, epoxy tung acid anhydride resin and epoxy phenolic resin.
As shown in fig. 1 and 2, the method for manufacturing the high-heat-conductivity multi-glue epoxy glass fiber powder mica tape comprises the following steps:
s1, carrying out surface activation treatment on the high-heat-conductivity filler: the mass percentage of the high heat conduction filler, the surfactant and the solvent is 100 percent: 0.5% -1.0%: 100%, preparing a solution by the surfactant and the solvent, then adding the high-heat-conductivity filler, stirring for 10-30 min, and drying the mixed solution at 120 ℃ to obtain the surface-activated high-heat-conductivity filler.
S2, uniformly mixing the high-heat-conductivity filler subjected to the surface activation treatment in the step one with modified bisphenol A epoxy resin, wherein the solid content of the epoxy resin is 5% -10%, and freezing and crushing the mixed solution to obtain rubber powder, wherein the particle size range of the rubber powder is 0.1-10 mu m, and the softening point of the rubber powder is 50-95 ℃; unreeling mica paper, and uniformly scattering rubber powder on one surface of the unreeled mica paper by a powder scattering machine; and (3) conveying the mica paper after the glue powder is scattered into a first drying tunnel to be dried to obtain the high-heat-conductivity mica paper, wherein the drying temperature is 120-130 ℃, and the drying time is 3-5 min.
S3, hanging the glass fiber cloth with the bonding material 2, compounding the glass fiber cloth with high-heat-conductivity mica paper to form a semi-finished product, and putting the semi-finished product into a second drying tunnel to be dried at 110-120 ℃ for 3-5 min to obtain the high-heat-conductivity multi-glue epoxy glass fiber powder mica tape.
The high heat conduction filler is composed of one or any two of the following materials: BN, alN, si 3 N 4 、Al 2 O 3 、MgO、ZnO、SrTiO 3 、TiO 2 、SiO 2 、BeO。
The particle size of the high heat conduction filler is 0.1-10 mu m, and the particles consist of particles with single particle size or multiple particle sizes.
The surface of the high heat conduction filler is subjected to activation treatment, so that the compatibility between the filler and the epoxy resin can be enhanced, the bonding strength between the filler and the mica paper can be improved, and the surface activator used by the filler is one of the following materials: silane coupling agent and titanate coupling agent.
The thickness of the high-heat-conductivity mica paper is 0.08-0.09 mm, the thickness of the high-heat-conductivity mica paper is almost not different from that of the mica paper used in the conventional mica tape, the added filler can be ensured not to influence the thickness of the manufactured high-heat-conductivity mica tape, the mica content can not be reduced, and the high-heat-conductivity insulation can be fully ensured to have good electrical performance.
When the high-heat-conductivity multi-glue epoxy glass fiber mica tape contains two layers of the alkali-free glass fiber cloth, the high-heat-conductivity mica paper layer is positioned in the middle of the two layers of the alkali-free glass fiber cloth, as shown in fig. 1.
When the high-heat-conductivity multi-glue epoxy glass fiber mica tape contains a layer of the alkali-free glass fiber cloth, as shown in fig. 2, the glass fiber cloth is adhered to one side of the high-heat-conductivity mica paper with glue powder.
The main insulation heat conductivity of the stator bar manufactured by the high heat conduction multi-glue epoxy glass fiber mica tape is not less than 0.35W/(m.k).
The high heat conduction multi-glue epoxy glass fiber powder mica tape prepared by the method has no substantial difference with the production process of the common epoxy multi-glue powder mica tape except that glue powder is scattered on the surface of mica paper, for example: preparing an adhesive, gluing glass fiber cloth, compounding high-heat-conductivity mica paper, drying, rolling and cutting.
The high-heat-conductivity multi-glue epoxy glass fiber powder mica tape prepared by the method is soft, is in close fit and does not delaminate in a binding process test. Standard aluminum flat bar with single side insulation thickness of 3.5mm (rated voltage U of bar) is manufactured by hot pressing process N =15 kV), its main insulation thermal conductivity is not less than 0.35W/(m·k), normal dielectric loss value is 0.2U N Lower tan delta is less than 1%, and the breakdown voltage of the wire rod reaches 5.5U N . Standard aluminium flat bar electric aging resistance test, 3.0U N The service life under voltage is longer than 10h and is 2.0U N The service life under voltage is more than 1000 hours.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A high heat conduction multi-glue epoxy glass fiber powder mica tape is characterized in that: the high-heat-conductivity mica paper layer (3) is made of calcined high-voltage white mica paper, and the mica ration is 100g/m 2 ～200g/m 2 Between them.
2. A method for manufacturing a high-heat-conductivity multi-glue epoxy glass fiber powder mica tape, which uses the high-heat-conductivity multi-glue epoxy glass fiber powder mica tape according to claim 1, and is characterized by comprising the following steps:
s1, carrying out surface activation treatment on a high-heat-conductivity filler, preparing a solution from a surface activator and a solvent, then adding the high-heat-conductivity filler, stirring for 10-30 min, and drying the mixed solution at 120 ℃ to obtain the surface-activated high-heat-conductivity filler; wherein the high heat conduction filler is composed of BN, alN, si 3 N 4 、Al 2 O 3 、MgO、ZnO、SrTiO 3 、TiO 2 、SiO 2 And BeO, one or two of the following;
s2, after surface activation treatment of the high-heat-conductivity filler, uniformly mixing the high-heat-conductivity filler with modified bisphenol A epoxy resin, wherein the solid content of the epoxy resin is 5% -10%, and freezing and crushing the mixed solution to obtain rubber powder, wherein the softening point of the rubber powder is 50 ℃ -95 ℃; unreeling mica paper, and uniformly scattering rubber powder on one surface of the unreeled mica paper by a powder scattering machine; the mica paper after the glue powder is spread is sent into a first drying tunnel to be baked to prepare the high heat conduction mica paper, the baking temperature is 120-130 ℃, and the baking time is 3-5 min;
s3, hanging a bonding material on the glass fiber cloth, then compounding the bonding material with high-heat-conductivity mica paper to form a semi-finished product, and putting the semi-finished product into a second drying tunnel to be dried at 110-120 ℃ for 3-5 min to obtain the high-heat-conductivity multi-glue epoxy glass fiber mica tape;
s4, the main insulation heat conductivity of the stator bar manufactured by the high heat conduction multi-glue epoxy glass fiber mica tape is not less than 0.35W/m - 1 k -1 。
3. The method for manufacturing the high-heat-conductivity multi-glue epoxy glass fiber mica tape, which is characterized in that: in the S1, the particle size of the high heat conduction filler is 0.1-10 mu m, and the particles consist of particles with single particle size or multiple particle sizes.
4. The method for manufacturing the high-heat-conductivity multi-glue epoxy glass fiber mica tape, which is characterized in that: in the S2, the dosage of the rubber powder is 5g/m 2 ～25g/m 2 。
5. The high thermal conductivity multi-glue epoxy glass fiber powder mica tape according to claim 1, which is characterized in that: the thickness of the material of the glass fiber cloth layer (1) is 0.020-0.030 mm, and the mass per unit area is 15-50g/m 2 。
6. The high thermal conductivity multi-glue epoxy glass fiber powder mica tape according to claim 1, which is characterized in that: the thickness of the high-heat-conductivity mica paper layer (3) is 0.08-0.12 mm.
7. The high thermal conductivity multi-glue epoxy glass fiber powder mica tape according to claim 1, which is characterized in that: the high-heat-conductivity mica paper layer (3) is positioned between the two glass fiber cloth layers (1), and the high-heat-conductivity multi-glue epoxy glass fiber mica tape comprises the two glass fiber cloth layers (1).
8. The high thermal conductivity multi-glue epoxy glass fiber powder mica tape according to claim 1, which is characterized in that: the glass fiber cloth layer (1) is adhered to one side of the high-heat-conductivity mica paper layer (3) with rubber powder, and the high-heat-conductivity multi-rubber epoxy glass fiber powder mica tape comprises a layer of glass fiber cloth layer (1).
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| CN202310275297.1A CN116313229A (en) | 2023-03-20 | 2023-03-20 | High-heat-conductivity multi-glue epoxy glass fiber powder mica tape and manufacturing method thereof |
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| CN202310275297.1A CN116313229A (en) | 2023-03-20 | 2023-03-20 | High-heat-conductivity multi-glue epoxy glass fiber powder mica tape and manufacturing method thereof |
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