CN115341410B - Composite mica paper - Google Patents
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- CN115341410B CN115341410B CN202211112905.9A CN202211112905A CN115341410B CN 115341410 B CN115341410 B CN 115341410B CN 202211112905 A CN202211112905 A CN 202211112905A CN 115341410 B CN115341410 B CN 115341410B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/26—All layers being made of paper or paperboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/552—Fatigue strength
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/554—Wear resistance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses composite mica paper, which comprises a first mica paper layer made of first mica slurry and a second mica paper layer made of second mica slurry; the first mica slurry is doped with an aramid fiber composition of precipitated aramid fibers and modified aramid chopped fibers; the second mica slurry is doped with an aramid fiber composition of aramid nanofibers and modified aramid chopped fibers; the modified aramid chopped fiber is prepared by taking chopped aramid fiber as a raw material, irradiating the chopped fiber with ultraviolet light to obtain chopped fiber I with surface defects, depositing a layer of nano titanium oxide on the surface of the chopped fiber I to obtain chopped fiber II, performing infiltration modification by using a silane coupling agent, and performing surface treatment by using a wet strength agent polyethylenimine after modification to obtain the modified aramid chopped fiber. The aramid fiber composition in the composite mica paper has good dispersion uniformity in paper, and can ensure the physical strength and structural stability of the mica paper while ensuring the electrical performance of the mica paper.
Description
Technical Field
The invention relates to the field of insulating mica products, in particular to composite mica paper with better physical properties.
Background
Mica is used as a kind of naturally generated lamellar silicate mineral, has excellent physical properties and electrical properties, maintains the properties under a high temperature state, has the characteristics of complete chemical inertness, high voltage resistance, corona discharge resistance and radiation protection, and has wide application in the electrical industry. The mica paper product is used as one of the most widely used ways at present, mica is used as a main raw material, fine mica flakes are broken by thermochemical or hydraulic stripping, and then a novel paper-based insulating material is prepared by means of a modern wet papermaking technology, and the novel paper-based insulating material inherits excellent electrical characteristics of the mica material and better surface bonding performance of the paper-based material, and is widely applied to the fields of ultra-high voltage transmission, rail transit, electronic communication, national defense and military industry and the like.
As an important category in mica paper, aramid fiber mica paper is an enhanced mica insulation material prepared by introducing aramid fiber as a reinforcing material into mica paper-based material or introducing mica as a functional filler into aramid fiber paper-based material, and the physical properties of the mica paper can be improved by utilizing the excellent properties of small density, good corrosion resistance, high strength, high modulus, fatigue resistance, wear resistance and the like of the aramid fiber, so that the mica paper-based material with excellent physicochemical properties is obtained. However, the aramid fibers adopted in the aramid mica paper are mainly composed of chopped fibers and fibrids, and are usually mixed in proportion in the paper-based material papermaking process, wherein the chopped aramid fibers are scattered in paper in a disordered manner during forming, so that the paper has higher tensile strength and tear resistance, but the chopped aramid fibers have higher hydrophobicity, and the interface binding force between the micas is poor, so that wet papermaking is not easy to perform, the formed paper-based material structure is loose, and the method is a main factor affecting the papermaking process performance; the fibrids can be singly formed into paper, the paper permeability is endowed to paper sheets, and the dielectric property of the formed paper is improved, which is the key point for influencing the papermaking performance and the insulation performance of the aramid paper, but the beating degree of the fibrids is generally controlled to be 45-50, the fibers in the slurry are longer, the fibrids are easy to flocculate in the flow forming process, the uniformity and the physical property of the formed paper are influenced, the realization of the mechanical property and the dielectric property of the formed paper is seriously influenced, the further improvement of the mechanical property, the dielectric property and the use stability of the formed paper is limited, and the application of the formed paper is influenced.
Therefore, searching a method for improving the surface defects of the aramid fibers or the mica and improving the interface bonding strength of the paper-based material is a key problem in the current preparation of the high-performance aramid mica paper-based material.
Disclosure of Invention
The invention solves the technical problem of providing the composite mica paper to solve the defects in the background technology.
The technical problems solved by the invention are realized by adopting the following technical scheme:
the composite mica paper comprises a first mica paper layer and a second mica paper layer, wherein the first mica paper layer is used as a core layer, the second mica paper layer is formed on one side or two side surfaces of the first mica paper layer to be used as a surface layer, and the first mica paper layer has a single-layer paper layer thickness larger than that of the second mica paper layer;
the first mica paper layer is manufactured and formed by utilizing first mica slurry through a wet manufacturing process, and the second mica paper layer is manufactured and formed by utilizing second mica slurry through a wet manufacturing process;
the first mica slurry is doped with a first type of aramid fiber composition accounting for 5-7wt% of the slurry, wherein the first type of aramid fiber composition comprises precipitated aramid fibers and modified aramid chopped fibers in a mass ratio of 2:3-1:1; the second mica slurry is doped with a second type aramid fiber composition accounting for 7-9 wt% of the slurry, wherein the second type aramid fiber composition comprises aramid nanofibers and modified aramid chopped fibers in a mass ratio of 1:1-3:1;
the length of the monofilament of the precipitated aramid fiber is 10-15 mm, and the diameter of the monofilament is 0.06-0.12 mm; the modified aramid chopped fiber is obtained by modifying chopped aramid fiber serving as a raw material in a modification mode that the chopped aramid fiber is irradiated by ultraviolet light to obtain chopped fiber I with a defective surface, a layer of nano titanium oxide is deposited on the surface of the chopped fiber I by a liquid phase deposition method to obtain chopped fiber II, the surface of the chopped fiber II is soaked by a silane coupling agent, and the surface of the soaked chopped fiber II is treated by a wet strength agent Polyethylenimine (PEI) to obtain the modified aramid chopped fiber; the filament diameter of the aramid nanofiber is 80-300 nm.
As a further definition, the thickness of the first mica paper layer is 1.5 to 3 times the thickness of the second mica paper layer.
As a further limitation, the mica ration of the first mica paper layer is 160-210 g/m 2 And the mica of the second mica paper layer has a ration of 100-180 g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The first mica paper layer is preferably natural muscovite paper or natural phlogopite paper, and the second mica paper layer is preferably synthetic fluorophlogopite paper.
As a further definition, the second mica paper layer is adhered to the surface of the first mica paper layer directly by an adhesive layer when formed.
As a further limitation, the first mica paper layer is uniformly molded with lattice holes, and surface roughening treatment is performed on the surface of one side or two sides of the first mica paper layer, and the second mica paper layer is directly molded on the surface of the first mica paper layer in a secondary papermaking mode during molding.
As a further limitation, 3 to 9 wt%o of nano inorganic matters are doped in the first mica slurry as heat conduction filling particles, and 7 to 9 wt%o of nano inorganic matters are doped in the second mica slurry as heat conduction filling particles; the nano inorganic matters are one or a combination of aluminum oxide, aluminum nitride, silicon nitride and boron nitride, and the available grain size range of the nano inorganic matters is 80-300 nm.
As a further limitation, the mica flakes employed in the first mica slurry are mica flake combinations comprising 65 to 75wt% mica flakes having a particle size of 120 to 160 μm, 5 to 10wt% mica flakes having a particle size of 160 to 200 μm, and the balance mica flakes having a particle size of 60 to 90 μm, while the mica flakes employed in the second mica slurry have a particle size of 120 to 150 μm.
As a further limitation, polyethylene oxide (PEO) is added to the first mica slurry as a dispersion modifier, and the addition amount of the polyethylene oxide to the first mica slurry is 3 to 8 wt%o of the mass of the slurry.
By way of further limitation, when the irradiation treatment is performed on the chopped aramid fiber by using ultraviolet light, the surface irradiation treatment is performed on the spread chopped aramid fiber by using ultraviolet light with a wavelength of 260-320 nm, and the treatment time is 24-32 hours.
The beneficial effects are that: the composite mica paper disclosed by the invention respectively uses a first mica paper layer formed by first mica slurry as a core layer and uses a second mica paper layer formed by second mica slurry as a surface layer;
the method comprises the steps of modifying aramid chopped fibers in a first mica paper layer of a core layer component, improving hydrophobicity and interface bonding performance, and filling and reinforcing titanium dioxide to compensate physical properties of the aramid chopped fibers subjected to surface defect treatment, so that reinforcing fibers with good bonding performance are obtained, and the use proportion of the aramid chopped fibers in the first mica paper layer is improved by using the modified aramid chopped fibers, so that physical indexes such as tensile strength, elongation and the like of mica paper are improved while electrical properties are ensured;
the surface wear resistance and weather resistance and ageing resistance of the surface layer are improved by the combination of the modified aramid chopped fibers and the aramid nanofibers, and the surface performance of the finished mica paper is improved.
Detailed Description
The invention is further described in connection with the following embodiments in order to make the technical means, the creation features, the achievement of the purpose and the effect of the invention easy to understand.
In the following examples, it will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Embodiment one:
in the first embodiment, the composite mica paper comprises a first mica paper layer and a second mica paper layer, wherein the first mica paper layer is a core layer, and is manufactured and formed on a cylinder paper machine by a first mica slurry through a wet manufacturing process; and the second mica paper layer is a surface layer, and is formed by the second mica slurry through papermaking on a cylinder mould paper machine by a wet papermaking process. The first mica paper layer and the second mica paper layer are formed by gluing between the first mica paper layer and the second mica paper layer after being formed separately, and then the first mica paper layer and the second mica paper layer are formed by hot press. In the embodiment, the first mica paper layer has a mica ration of 176-185 g/m 2 The mica ration of the second mica paper layer is 130-160 g/m 2 The thickness of the first mica paper layer after molding is 2 times of that of the second mica paper layer, and the adhesive layer between the first mica paper layer and the second mica paper layer is an epoxy resin adhesive layer with the thickness of 0.03-0.05 mm.
The first mica slurry is prepared by mixing 27wt% of water, 65wt% of mica flakes and 8wt% of phenolic epoxy resin glue and pulping; wherein the mica flakes are mica flake combinations, and the mica flake combinations comprise 70wt% of mica flakes with the particle size of 130-150 mu m, 10wt% of mica flakes with the particle size of 160-180 mu m and 20wt% of mica flakes with the particle size of 60-90 mu m.
Adding 6wt% of a first type aramid fiber composition into the slurry after pulping is completed; wherein the first type of aramid fiber composition comprises precipitated aramid fibers and modified aramid chopped fibers in a mass ratio of 1:1, wherein:
the monofilament length of the precipitated aramid fiber is 10-12 mm, and the monofilament diameter of the precipitated aramid fiber is 0.08-0.10 mm;
the modified aramid chopped fiber is prepared by taking chopped aramid fiber with the length of a monofilament of 5-6 mm as a raw material, carrying out ultraviolet irradiation treatment on the chopped aramid fiber, and carrying out surface irradiation treatment on the flattened chopped aramid fiber by adopting ultraviolet light with the wavelength of 260-280 nm in the irradiation treatment process, wherein the treatment time is 30 hours; obtaining a chopped fiber I with a defective surface after the treatment is finished, wherein the chopped fiber I has a rough surface, the surface is provided with ravines and grooves under an electron microscope, but not the smooth and flat outer surface of an unirradiated aramid fiber, then depositing a layer of nano titanium oxide on the rough surface of the chopped fiber I by a liquid phase deposition method on the surface of the chopped fiber I, and performing secondary surface treatment by using a wet strength agent Polyethylenimine (PEI) after the silane coupling agent infiltration treatment to obtain a modified aramid chopped fiber;
the processing is carried out on the aramid chopped fiber because the ultraviolet light with the wavelength has higher energy and strong aging damage capability on the polymer material, when the aramid fiber is irradiated by the ultraviolet light, the ultraviolet light can cause various chemical reactions on the surface of the fiber, oxidation and degradation are easy to occur, the conditions of bond breaking and chain breaking occur and the volatilization of small molecular substances is accompanied, and the process can lead to the reduction of the mechanical properties of elasticity, tensile strength and the like of the fiber, but can lead the surface of the aramid fiber to have ravines and grooves and become coarser; however, the process needs to strictly control the illumination time of ultraviolet light, and if the illumination time is too short, the rough surface of the aramid fiber with the grooves and the ravines on the surface is not easy to obtain; if the illumination time is too long, the physical and chemical properties of the aramid fiber can be directly and completely destroyed or greatly destroyed, so that the effect of enhancing the properties cannot be achieved.
The nano titanium oxide deposited by the liquid phase deposition method of the chopped fiber I obtained in the treatment mode can fill the ravines and the grooves, has better adhesion performance on the rough surface, can compensate the physical properties of the part of the chopped aramid fiber which is lost in the ultraviolet irradiation process, and can effectively optimize the heat dissipation performance of the formed first mica paper layer.
The treated first mica paper layer is subjected to surface treatment by using a silane coupling agent and then using a wet strength agent Polyethylenimine (PEI), and at the moment, the rough surface of the chopped fiber I has better affinity to the Polyethylenimine (PEI) due to bond breakage, so that the hydrophobicity of the aramid chopped fiber can be effectively improved, and the interface performance of the aramid chopped fiber is optimized, so that a compact structure paper structure with higher tensile strength and tear resistance is formed in a wet papermaking process in an increased dosage mode.
And the second mica slurry is pulped after being mixed by 30 weight percent of water, 63 weight percent of mica flakes and 7 weight percent of phenolic epoxy resin glue; wherein the mica flake is mica flake with a single particle size of 120-150 mu m. Adding 8wt% of a second type aramid fiber composition into the slurry after pulping; wherein the second class of aramid fiber composition comprises aramid nanofibers and modified aramid chopped fibers with the wire diameters of 200-280 nm in a mass ratio of 2:1.
The aramid nanofibers adopted in the embodiment of the second mica slurry have the advantages of one-dimensional nano scale, high length-width ratio, high specific surface area, excellent strength and modulus, good chemical stability and thermal stability, and the like, when the aramid nanofibers are used together with the modified aramid chopped fibers modified by the method, the microstructure of the second mica paper layer can be effectively adjusted, the integral performance of the second mica paper layer is improved, particularly, the second mica paper layer can obtain better surface performance, and meanwhile, the aramid nanofibers also have better interface bonding strength (but not like the modified aramid chopped fibers), can improve the mechanical performance and dielectric performance of the second mica paper layer, and can obtain better surface wear resistance and weather resistance and ageing resistance.
Embodiment two:
in the second embodiment, the composite mica paper comprises a first mica paper layer and two second mica paper layers, wherein the first mica paper layer is a core layer, and the first mica slurry is formed by papermaking on a cylinder paper machine by a wet papermaking process.
Before the integral forming of the composite mica paper, the first mica paper layer is firstly formed for later use, the surface of the first mica paper layer is rubbed by sand paper to obtain the first mica paper layer with roughened surfaces on two sides, and then uniformly forming lattice holes are formed on the surface of the first mica paper layer by punching equipment; and then taking the first mica paper layer with holes and rough surfaces as a substrate, pulping and papermaking by a cylinder mould paper machine to obtain middle paper materials with second mica pulp attached to the surfaces of two sides, and then sequentially performing pre-drying, squeezing, post-drying and calendaring to obtain the composite mica paper. In the embodiment, the first mica paper layer has a mica ration of 180-210 g/m 2 The mica ration of the second mica paper layer is 120-150 g/m 2 The thickness of the first mica paper layer after molding is 2.5 times of that of the second mica paper layer, and the adhesive layer between the first mica paper layer and the second mica paper layer is an epoxy resin adhesive layer with the thickness of 0.03-0.05 mm.
Mixing 26wt% of water, 66wt% of mica flakes and 8wt% of phenolic epoxy resin glue in the first mica slurry, and pulping; wherein the mica flakes are mica flake combinations, and the mica flake combinations comprise 75wt% of mica flakes with the particle size of 140-160 mu m, 10wt% of mica flakes with the particle size of 180-200 mu m and 25wt% of mica flakes with the particle size of 60-80 mu m.
Adding a first type aramid fiber composition accounting for 5wt% of the slurry into the slurry after pulping, adding nano inorganic matters accounting for 7wt% of the slurry as heat-conducting filling particles and polyethylene oxide (PEO) accounting for 3-8 wt% of the slurry;
wherein the first type of aramid fiber composition comprises precipitated aramid fibers and modified aramid chopped fibers in a mass ratio of 2:3; the length of the monofilament selected for the fibrid of the first class of aramid fiber composition is 12-15 mm, and the diameter of the monofilament is 0.08-0.10 mm; and the chopped aramid fiber with the length of 6-8 mm is used as a raw material for carrying out ultraviolet irradiation treatment on the chopped aramid fiber, and in the irradiation treatment process, the ultraviolet light with the wavelength of 270-290 nm is adopted for carrying out surface irradiation treatment on the flattened chopped aramid fiber, wherein the treatment time is 24 hours; and (3) obtaining the chopped fiber I with the defective surface after the treatment is finished, depositing a layer of nano titanium oxide on the surface of the chopped fiber I by a liquid phase deposition method on the surface of the chopped fiber I, and performing secondary surface treatment by using a wet strength agent Polyethylenimine (PEI) after the silane coupling agent infiltration treatment to obtain the modified aramid chopped fiber.
The nano inorganic matter is a mixture of hexagonal boron nitride and aluminum oxide in a mass ratio of 1:1, so as to match with nano titanium oxide deposited on the modified aramid chopped fibers in the modified aramid chopped fibers to realize the effects of soaking and structural reinforcement.
In addition, polyethylene oxide (PEO) is also added into the first mica slurry as a dispersion modifier, the adding amount of the polyethylene oxide in the first mica slurry is 3-8wt% of the mass of the slurry, and experiments prove that in a mica slurry system, the polyethylene oxide (PEO) is the optimal dispersing agent for aramid fibers, and a proper amount of polyethylene oxide (PEO) is added into the slurry as a dispersing agent to stabilize the aqueous slurry dispersion system, so that the fibers in the mica paper are uniformly distributed, and the quality and the performance of paper are improved.
And the second mica slurry is pulped after being mixed by 30 weight percent of water, 63 weight percent of mica flakes and 7 weight percent of phenolic epoxy resin glue; wherein the mica flake is mica flake with a single particle size of 120-150 mu m. Adding 9wt% of a second type aramid fiber composition into the slurry after pulping; wherein the second class of aramid fiber composition comprises the aramid nanofiber with the wire diameter of 160-180 nm and the modified aramid chopped fiber with the mass ratio of 3:1.
According to detection, the tensile strength of the mica paper prepared in the first embodiment is more than or equal to 55Rm/MPa, the tensile strength is 22.9N/cm, the tearing strength is 2.3N, and the dielectric strength is 24.6kV/mm; the mica paper prepared in the second embodiment has tensile strength of more than or equal to 60Rm/MPa, tensile strength of 26.5N/cm, tear resistance of 2.7N and dielectric strength of 22.8kV/mm.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The composite mica paper is characterized by comprising a first mica paper layer and a second mica paper layer, wherein the first mica paper layer is used as a core layer, the second mica paper layer is formed on one side or two side surfaces of the first mica paper layer to serve as a surface layer, and the first mica paper layer and the second mica paper layer are adhered through an epoxy resin adhesive layer; the first mica paper layer has a single-layer paper layer thickness greater than the second mica paper layer;
the first mica paper layer is manufactured and formed by utilizing first mica slurry through a wet manufacturing process, and the second mica paper layer is manufactured and formed by utilizing second mica slurry through a wet manufacturing process;
the first mica slurry is prepared by mixing 27wt% of water, 65wt% of mica flakes and 8wt% of phenolic epoxy resin glue or 26wt% of water, 66wt% of mica flakes and 8wt% of phenolic epoxy resin glue and pulping; the mica flakes are mica flake combinations, and the mica flake combinations comprise 65-75wt% of mica flakes with the particle size of 120-160 mu m, 5-10wt% of mica flakes with the particle size of 160-200 mu m and the balance of mica flakes with the particle size of 60-90 mu m;
mixing 30wt% of water, 63wt% of mica flakes and 7wt% of phenolic epoxy resin glue in the second mica slurry, and pulping; wherein the adopted mica flake has a particle size of 120-150 mu m;
the first mica slurry is doped with a first type of aramid fiber composition accounting for 5-7wt% of the slurry, wherein the first type of aramid fiber composition comprises precipitated aramid fibers and modified aramid chopped fibers in a mass ratio of 2:3-1:1; the second mica slurry is doped with a second type aramid fiber composition accounting for 7-9wt% of the slurry, wherein the second type aramid fiber composition comprises aramid nanofibers and modified aramid chopped fibers in a mass ratio of 1:1-3:1;
the length of the filaments of the precipitated aramid fiber is 10-15 mm, and the diameter of the filaments is 0.06-0.12 mm; the modified aramid chopped fiber is obtained by modifying chopped aramid fiber serving as a raw material in a modification mode that ultraviolet light is irradiated to the chopped aramid fiber, when the ultraviolet light is used for irradiating the chopped aramid fiber, ultraviolet light with the wavelength of 260-320 nm is used for carrying out surface irradiation treatment on the flattened chopped aramid fiber, the treatment time is 24-32 h, a chopped fiber I with a defective surface is obtained, a layer of nano titanium oxide is deposited on the surface of the chopped fiber I by a liquid phase deposition method to obtain a chopped fiber II, the surface of the chopped fiber II is soaked by a silane coupling agent, and after the soaking is finished, surface treatment is carried out by using a wet strength agent polyethylenimine, so that the modified aramid chopped fiber is obtained; the filament diameter of the aramid nanofiber is 80-300 nm.
2. The composite mica paper according to claim 1, wherein the thickness of the first mica paper layer is 1.5-3 times the thickness of the second mica paper layer.
3. The composite mica paper according to claim 1, wherein the mica of the first mica paper layer has a basis weight of 160-210 g/m 2 And the mica ration of the second mica paper layer is 100-180 g/m 2 。
4. The composite mica paper according to claim 1, wherein the first mica paper layer is a natural muscovite paper or a natural phlogopite paper and the second mica paper layer is a synthetic fluorophlogopite paper.
5. The composite mica paper according to claim 1, wherein the first mica paper layer is uniformly formed with lattice holes, and is subjected to surface roughening treatment on one or both side surfaces of the first mica paper layer, and the second mica paper layer is directly formed on the surface of the first mica paper layer by a secondary papermaking method during forming.
6. The composite mica paper according to claim 1, wherein 3-9wt% of nano inorganic matters are doped in the first mica slurry as heat conduction filling particles, and 7-9wt% of nano inorganic matters are doped in the second mica slurry as heat conduction filling particles; the nano inorganic matters are one or a combination of aluminum oxide, aluminum nitride, silicon nitride and boron nitride, and the particle size range of the nano inorganic matters is 80-300 nm.
7. The composite mica paper according to claim 1, wherein polyethylene oxide is added to the first mica slurry as a dispersion modifier, and the addition amount of the polyethylene oxide in the first mica slurry is 3-8wt% of the mass of the slurry.
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| CN115787346B (en) * | 2022-12-01 | 2023-09-22 | 齐鲁工业大学 | Efficient dispersion method of aramid fiber |
| CN116377756B (en) * | 2023-03-20 | 2024-02-20 | 湖南荣泰新材料科技有限公司 | Method for improving interfacial bonding performance of mica and reinforced fiber |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105544285A (en) * | 2015-12-16 | 2016-05-04 | 烟台民士达特种纸业股份有限公司 | M-aramid fiber mica paper and preparation method thereof |
| CN105544286A (en) * | 2015-12-16 | 2016-05-04 | 烟台民士达特种纸业股份有限公司 | Preparation method of p-aramid fiber-mica paper |
| CN106637953A (en) * | 2016-12-14 | 2017-05-10 | 陕西科技大学 | Modification method of p-aramid fiber chopped fiber |
| CN110387770A (en) * | 2019-07-19 | 2019-10-29 | 陕西科技大学 | A kind of dopen Nano TiO2Uvioresistant p-aramid fiber nanometer paper and preparation method thereof |
| CN111364280A (en) * | 2020-04-25 | 2020-07-03 | 霸州市卓源云母科技有限公司 | Mica membrane and preparation method thereof |
| CN111926612A (en) * | 2020-08-10 | 2020-11-13 | 中国制浆造纸研究院衢州分院 | Preparation method of high-performance aramid fiber nano mica insulation paper |
| CN113136739A (en) * | 2021-04-21 | 2021-07-20 | 陕西科技大学 | Method for improving interface bonding strength of aramid fiber mica paper |
| CN113652900A (en) * | 2021-07-27 | 2021-11-16 | 通城县云水云母科技有限公司 | Basalt/aramid/mica paper and production method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106245411B (en) * | 2016-08-30 | 2018-02-02 | 烟台民士达特种纸业股份有限公司 | A kind of production method of meta-aramid fibers paper base material |
-
2022
- 2022-09-14 CN CN202211112905.9A patent/CN115341410B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105544285A (en) * | 2015-12-16 | 2016-05-04 | 烟台民士达特种纸业股份有限公司 | M-aramid fiber mica paper and preparation method thereof |
| CN105544286A (en) * | 2015-12-16 | 2016-05-04 | 烟台民士达特种纸业股份有限公司 | Preparation method of p-aramid fiber-mica paper |
| CN106637953A (en) * | 2016-12-14 | 2017-05-10 | 陕西科技大学 | Modification method of p-aramid fiber chopped fiber |
| CN110387770A (en) * | 2019-07-19 | 2019-10-29 | 陕西科技大学 | A kind of dopen Nano TiO2Uvioresistant p-aramid fiber nanometer paper and preparation method thereof |
| CN111364280A (en) * | 2020-04-25 | 2020-07-03 | 霸州市卓源云母科技有限公司 | Mica membrane and preparation method thereof |
| CN111926612A (en) * | 2020-08-10 | 2020-11-13 | 中国制浆造纸研究院衢州分院 | Preparation method of high-performance aramid fiber nano mica insulation paper |
| CN113136739A (en) * | 2021-04-21 | 2021-07-20 | 陕西科技大学 | Method for improving interface bonding strength of aramid fiber mica paper |
| CN113652900A (en) * | 2021-07-27 | 2021-11-16 | 通城县云水云母科技有限公司 | Basalt/aramid/mica paper and production method thereof |
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