CN113643867B - Mica piece with high surface tear strength and forming method thereof - Google Patents

Mica piece with high surface tear strength and forming method thereof Download PDF

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Publication number
CN113643867B
CN113643867B CN202111190738.5A CN202111190738A CN113643867B CN 113643867 B CN113643867 B CN 113643867B CN 202111190738 A CN202111190738 A CN 202111190738A CN 113643867 B CN113643867 B CN 113643867B
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mica
modified
kevlar fiber
prepared
high surface
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CN113643867A (en
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袁忠纯
陆锦琪
姚静
欧阳林
周培学
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Zhejiang Rongtai Electrical Equipment Co ltd
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Zhejiang Rongtai Electrical Equipment Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/60—Composite insulating bodies
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1055—Coating or impregnating with inorganic materials
    • C04B20/1074—Silicates, e.g. glass
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/30—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Other silicon-containing organic compounds; Boron-organic compounds
    • C04B26/32—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Other silicon-containing organic compounds; Boron-organic compounds containing silicon
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/45—Oxides or hydroxides of elements of Groups 3 or 13 of the Periodic System; Aluminates
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
    • D06M11/46—Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic System; Titanates; Zirconates; Stannates; Plumbates
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
    • D06M11/74—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon or graphite; with carbides; with graphitic acids or their salts
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/77—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof
    • D06M11/79—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof with silicon dioxide, silicic acids or their salts
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
    • 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
    • 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
    • H01B3/002—Inhomogeneous material in general
    • H01B3/006—Other inhomogeneous material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/229—Composite material consisting of a mixture of organic and inorganic materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/34—Polyamides
    • D06M2101/36—Aromatic polyamides
    • 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

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  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The application relates to the technical field of processing of mica products, in particular to a mica piece with high surface tear strength and a forming method thereof. A mica member with high surface tearing strength comprises a mica member main body, wherein the mica member main body is prepared from organic silicon resin and mica slurry; the mica slurry is prepared from the following raw materials in parts by weight: 100 parts of mica powder composition, 2-8 parts of reinforcing filler and 80-120 parts of organic solvent; the reinforced filler mainly comprises modified Kevlar fibers; the modified Kevlar fibers are vertically distributed in the mica part main body; the modified Kevlar fiber consists of Kevlar fiber and a modified coating coated on the outer wall of the Kevlar fiber; the Kevlar fiber has the specification of 100-300D and the length of 0.1-1.0 mm. This application tears the in-process from type paper on double-sided tape, mica goods surface department is difficult for being destroyed, and mica goods quality is better.

Description

Mica piece with high surface tear strength and forming method thereof
Technical Field
The application relates to the technical field of processing of mica products, in particular to a mica piece with high surface tear strength and a forming method thereof.
Background
At present, the new energy automobile industry develops rapidly, and the research and development of a battery pack as one of the cores of the new energy automobile industry is particularly critical. Safety and stability of a battery pack of a new energy automobile are one of the most concerned problems of consumers.
In order to ensure the safety performance of the battery pack, manufacturers of new energy vehicles adopt a mica product with high insulativity as an insulation protection material of a battery pack shell, and the mica product has high insulativity and high temperature resistance, so that the mica product can provide good safety protection for the battery pack. In the actual processing process of pasting the mica product on the battery pack, the double faced adhesive tape needs to be pasted on the surface of the mica product, the release paper of the double faced adhesive tape needs to be uncovered, and the mica product is pasted on the outer side of the battery pack.
In view of the above processing procedure of sticking mica product to the battery pack, the inventors found that the following defects exist: operating personnel tears the in-process from type paper on with the double faced adhesive tape, has appeared that mica goods superficial layer is tearing the in-process from type paper and has taken place to drop, leads to whole mica goods condemned problem.
Disclosure of Invention
In order to solve the problem that the surface layer of a mica product falls off in the tearing process of release paper to cause the scrapping of the whole mica product in the prior art, the application provides a mica piece with high surface tearing strength and a forming method thereof.
In a first aspect, the application provides a mica member with high surface tear strength, which is realized by the following technical scheme:
a mica member with high surface tearing strength comprises a mica member main body, wherein the mica member main body is prepared from organic silicon resin and mica slurry; the mica slurry is prepared from the following raw materials in parts by weight: 100 parts of mica powder composition, 2-8 parts of reinforcing filler and 80-120 parts of organic solvent; the reinforced filler mainly comprises modified Kevlar fibers; the modified Kevlar fibers are vertically distributed in the mica part main body; the modified Kevlar fiber consists of Kevlar fiber and a modified coating coated on the outer wall of the Kevlar fiber; the Kevlar fiber has the specification of 100-300D and the length of 0.1-1.0 mm; the modified coating is prepared from a modified coating, and the modified coating is prepared from the following raw materials in percentage by mass: 20-25% of water-based polyurethane, 2-5% of nonionic dispersant, 0.5-3% of non-silicone mineral oil defoamer, 2-5% of organic silicon base material wetting agent, 1-3% of propylene glycol phenyl ether, 0.5-2% of pH regulator, 20-40% of deionized water and 5-25% of toughening filler; the toughening filler comprises graphene; the preparation method of the modified Kevlar fiber comprises the following steps:
s1, placing the Kevlar fiber in 3.0-8.0% ethanol water solution, carrying out ultrasonic treatment for 200-400S, washing with water, and drying for later use;
s2, performing plasma surface treatment on the Kevlar fiber in the S1, wherein the treatment temperature is 0-15 ℃, the gas medium is oxygen, and the treatment time is controlled to be 10-15 min;
s3, preparing a modified coating, spraying the modified coating on the outer wall of the Kevlar fiber in the S2, curing at 60-75 ℃, and forming a modified coating on the outer wall of the Kevlar fiber to obtain the modified Kevlar fiber.
By adopting the technical scheme, the modified Kevlar fiber which has certain conductivity and is better in compatibility with the modified mica mixture and the reinforcing filler can be prepared, the interlayer acting force of the mica is effectively enhanced by adopting the modified Kevlar fiber, the surface tearing strength is further improved, the surface of a mica product is not easily damaged in the tearing process of the release paper on the double-sided tape, and the quality of the mica product is effectively ensured.
Preferably, the silicone resin comprises KR-242A silicone resin and a fluorine-containing surface modifier; the mass ratio of the KR-242A silicon resin to the fluorine-containing surface modifier is 1: (0.2-0.4).
By adopting the technical scheme, the introduction of fluorine element into the organic silicon resin can improve the surface interfacial force of the mica product, so that the surface layer of the mica product is easy to peel from the release paper.
Preferably, the fluorine-containing surface modifier is a fluorine-containing polysiloxane or a mixture of a fluorine-containing polysiloxane and an end-capping modified polysiloxane.
By adopting the technical scheme, the organic silicon resin has good cohesiveness and high temperature resistance, and the heat resistance, the adhesive strength and the bending strength of the prepared mica product can be improved.
Preferably, the fluorine-containing polysiloxane is poly (trifluoropropylmethylsiloxane); the end-capped modified polysiloxane is FM-DA26 modified hydroxyl siloxane with the molecular weight of 15000; the mass ratio of the polytrifluoropropylmethylsiloxane to the FM-DA26 modified hydroxysiloxane is (6-8) to (2-4).
By adopting the technical scheme, the surface layer of the mica product is easy to peel off from the release paper, and the chemical resistance and the mechanical strength of the whole mica product can be improved.
Preferably, the reinforcing filler consists of modified Kevlar fibers, gamma-alumina fibers and silicon carbide whiskers; the mass ratio of the modified Kevlar fiber to the gamma-alumina fiber to the silicon carbide whisker is (6-10): (6-8): 0.2.
by adopting the technical scheme, the compatibility of the modified Kevlar fiber, the modified mica mixture and the reinforcing filler is good, the integral interlayer strength can be improved, and the surface tearing resistance is improved; the compatibility of the gamma-alumina fiber and the organic silicon resin adhesive is good, the gamma-alumina fiber and the organic silicon resin adhesive can be uniformly dispersed in mica slurry, the effects of toughening and reducing surface stress concentration can be achieved, and the deformation bending resistance and elasticity of a mica product can be improved by combining with the compounded silicon carbide whisker, so that the prepared mica product can be ensured to have high insulativity, high heat resistance, good mechanical property, ductility and toughness by compounding the modified Kevlar fiber, the gamma-alumina fiber and the silicon carbide whisker as toughening fillers.
Preferably, the toughening filler consists of synthetic mica, graphene, zirconium oxide and yttrium oxide; the mass ratio of the synthetic mica to the graphene to the zirconium oxide to the yttrium oxide is 20: (8-10): 4: 1.
by adopting the technical scheme, the modified Kevlar fiber is endowed with certain conductivity by the graphene, so that the subsequent forming processing of a mica piece is facilitated; in addition, the zirconium oxide can generate stress-induced phase change under the action of stress, and plays a role in improving the toughness, heat resistance and bending strength of the modified Kevlar fiber; the yttrium oxide is used as a stabilizer of the zirconia to ensure that the zirconia plays a toughening and reinforcing function.
Preferably, the mica powder composition is composed of muscovite, biotite and synthetic mica; the particle sizes of the muscovite, the biotite and the synthetic mica are all less than 800 meshes; the mass ratio of the muscovite, the biotite and the synthetic mica is 10:1 (1-2).
By adopting the technical scheme, the mica product prepared by compounding the muscovite, the biotite and the synthetic mica has better electrical insulation performance and high temperature resistance and also has stronger bending strength.
In a second aspect, the present application provides a forming process of a mica member with high surface tear strength, which is implemented by the following technical solutions:
a process for forming a mica piece having a high surface tear strength, comprising the steps of:
s1, weighing the mica powder composition according to the proportion, adding 2.0-5.0g/L mica surfactant aqueous solution, and carrying out ultrasonic treatment for 5-10min to obtain a modified mica mixture;
s2, uniformly mixing the modified mica mixture, the reinforcing filler and the organic solvent, adding the organic silicon resin, and uniformly stirring to obtain mica slurry;
s3, injecting the mica slurry into a forming mold, placing the forming mold between two pole plates of a capacitor, enabling the direction of an electric field of the capacitor and the height direction of the mold to be in the same direction, placing for 30-60min, and heating the mold to remove the organic solvent in the mica slurry in the placing process;
and S4, taking out the die, and carrying out hot press molding to obtain the mica product.
By adopting the technical scheme, the mica product with the modified Kevlar fiber vertically distributed in the mica part main body can be prepared, and the mica product has the advantages of good surface tearing strength, high insulativity, high heat resistance, good toughness and good ductility.
Preferably, the method also comprises S5, the mica product in S4 is subjected to heat treatment, the temperature is firstly heated to 55 ℃ at the heating rate of 1.0-2.0 ℃/min, the temperature is kept for 4-6min, the temperature is heated to 85 +/-5 ℃ at the heating rate of 1.0-2.0 ℃/min, the temperature is kept for 60-90min, and the finished product is obtained after natural cooling.
By adopting the technical scheme, the internal stress of the mica product can be eliminated, so that the mechanical property of the mica product is improved, and the quality of the mica product is improved.
In summary, the present application has the following advantages:
1. this application has better anti surface tearing strength, and the in-process is torn from type paper on the double faced adhesive tape, and mica goods surface department is difficult for being destroyed, has guaranteed the quality of the mica goods of this application preparation.
2. The mica product with good surface tearing strength, high insulativity, high heat resistance, certain toughness and ductility can be prepared by the preparation method.
Detailed Description
The present application will be described in further detail with reference to examples.
The tape was a 3M tape, series 3M4945ETC, 0.4mm thick, from 3M company, USA.
The biotite is from a processing plant for the tourmaline mineral products in Ling shou county, and has a particle size of 20-40 mesh.
The fluorophlogopite is originated from Shijiazhuang FengMing mineral products Co, and the granularity is 40 meshes.
The muscovite is from the processing factory of Lingshan Mallin mineral, and has a particle size of 20 meshes.
Kevlar fiber is derived from DuPont, USA, with a specification of 200D, a strength of 3.6Gpa, an elongation modulus of 131Gpa, and an elongation at break of 2.8% -3.5%.
The gamma-alumina fiber is from Nanjing physical engineering and aerospace dragon new materials science and technology corporation.
The silicon carbide crystal whisker of the top grade pure GR is from Shanghai Moguo Ntech limited.
The yttrium oxide is sourced from Hangzhou Wanjing New Material Co., Ltd, CAS No.: 114-36-9.
The graphene is sourced from Zhengzhou Konjac chemical product Co., Ltd, the content of active substances is 99.8%, and the CAS number is 608-568-68.
The waterborne polyurethane is purchased from Hezhen Hengtu Fuchun Co., Ltd, the solid content is 50 +/-1%, and the viscosity is 700-.
The nonionic dispersant is selected from a Texaco nonionic wetting dispersant BREAK-THRU DA 646, which is sourced from Kyong chemical Guangzhou company (supplier).
The defoaming agent is an industrial grade Foamaster MO 2190 defoaming agent, the brand is Basff, the density is 0.886g/L, and the defoaming agent is sourced from Guangzhou Si coating source chemical industry Co.
Propylene glycol phenyl ether is available from Dow chemical company, USA.
The pH adjusting agent was VaNTEX-T, available from fast commercial Co., Ltd, Guangzhou, Inc., Istman Eastman, USA.
KH570 silane coupling agent, industrial grade, is sourced from Shandonghai Shuzo silicone science and technology Co.
Poly (trifluoropropylmethylsiloxane) having the molecular formula C4H7F3Osi under CAS number 63148-56-1, available from Wuhan Povlov Biotech Ltd.
FM-DA26 modified hydroxy siloxane with a number average molecular weight of 15000, was derived from Japanese JNC.
Preparation example 1
The preparation method of the zirconium oxide comprises the following steps: adding 5.0L of 10% sodium hydroxide solution into a stirring and grinding integrated machine, gradually adding 200g of zirconium oxychloride (alatin) into the sodium hydroxide solution in the stirring and grinding integrated machine, controlling the temperature at 4 ℃, stirring and grinding at 60rpm for 60min, cleaning the mixture, standing and precipitating for 2h, cleaning with ethanol, filtering, drying at 30 ℃ to obtain a semi-finished product, placing the semi-finished product in a planetary ball mill, ball-milling at 100rpm for 40min to obtain zirconium oxide powder, calcining the obtained zirconium oxide powder at 1050 +/-5 ℃ for 2h, and naturally cooling to obtain the t-phase zirconium oxide.
Preparation example 2
The modified coating is prepared from the following raw materials in percentage by mass: 24% of aqueous polyurethane, 2.5% of Texaco nonionic wetting dispersant BREAK-THRU DA 646, 1% of Foamaster MO 2190 antifoaming agent, 4% of silicone base wetting agent, 2% of propylene glycol phenyl ether, 1% of Vantex-T, 55.5% of deionized water, 5.71% of synthetic mica, 2.86% of graphene, 1.14% of zirconium oxide in preparation example 1 and 0.29% of yttrium oxide.
Placing the purchased 40-mesh fluorophlogopite in a planetary ball mill, carrying out ball milling for 15min at 120rpm, and screening by using a 1000-mesh screen to obtain the fluorophlogopite with the granularity smaller than 1000 meshes. And placing the purchased graphene in a planetary ball mill, carrying out ball milling for 60min at 60rpm, and screening by using a 1200-mesh screen to obtain the graphene with the granularity smaller than 1200 meshes. Putting the purchased yttrium oxide powder into a planetary ball mill, carrying out ball milling for 15min at 120rpm, and screening by using a 1000-mesh screen to obtain the yttrium oxide powder with the granularity smaller than 1000 meshes.
The preparation method of the modified Kevlar fiber comprises the following steps:
s1, placing the purchased 200D Kevlar fiber in 5% ethanol water solution, carrying out ultrasonic treatment for 250S with the ultrasonic frequency of 48KHz, removing impurities on the surface of the Kevlar fiber after the ultrasonic treatment is finished, washing the Kevlar fiber twice by using deionized water, and drying at 40 ℃ for later use;
s2, performing plasma surface treatment on the Kevlar fiber in the S1, wherein the treatment temperature is 4 ℃, the gas medium is oxygen, and the treatment time is controlled to be 15 min;
s3, preparing a modified coating, weighing 2.4kg of waterborne polyurethane, placing the waterborne polyurethane in a reaction kettle, adding 5.05kg of deionized water, 0.25kg of Delgassa nonionic wetting dispersant BREAK-THRU DA 646, 0.2kg of propylene glycol phenyl ether, 0.1kg of VantEX-T and 0.05kg of Foamaster MO 2190 defoaming agent at a stirring speed of 120rpm, stirring for 2min, adding 571g of fluorophlogopite with the granularity smaller than 1000 meshes, 286g of graphene with the granularity smaller than 1200 meshes, 114g of zirconium oxide in preparation example 1, 29g of yttrium oxide powder with the granularity smaller than 1000 meshes and 0.05kg of Foamaster MO 2190 defoaming agent, and stirring and mixing for 10min at 320rpm to obtain the modified coating;
s4, spraying the modified coating prepared in the S3 on the outer wall of the Kevlar fiber in the S2, enabling the Kevlar fiber to pass through a 0.1mm silk equalizing plate, scraping the redundant modified coating, sending the Kevlar fiber into an oven, and curing at 65 ℃ to obtain the modified Kevlar fiber;
and S5, cutting the modified Kevlar fiber obtained in the step S4 to a length of 0.2 +/-0.02 mm to obtain the finished modified Kevlar fiber.
Preparation example 3
The preparation of the mica powder composition comprises the following steps:
s1, putting 10kg of muscovite into a planetary ball mill, ball-milling for 10min at 120rpm, and screening by using a 1000-mesh screen to obtain the muscovite with the particle size smaller than 1000 meshes; putting 5kg of biotite into a planetary ball mill, carrying out ball milling at 150rpm for 10min, screening by using a 1000-mesh screen to obtain the biotite with the granularity smaller than 1000 meshes, putting 5kg of fluorophlogopite into the planetary ball mill, carrying out ball milling at 120rpm for 10min, and screening by using a 1000-mesh screen to obtain the fluorophlogopite with the granularity smaller than 1000 meshes;
s2, weighing 1000g of muscovite with the particle size less than 1000 meshes, 100g of biotite with the particle size less than 1000 meshes and 200g of fluorophlogopite with the particle size less than 1000 meshes, placing the mixture in a high-speed dispersion kettle, and mixing for 8min at the rotating speed of 200rpm to obtain the mica powder composition.
Preparation example 4
Preparation of reinforcing filler, 100g of the modified Kevlar fiber of preparation example 2, 60g of gamma-alumina fiber and 2g of silicon carbide whisker were weighed, placed in a high-speed dispersion vessel, and mixed at 80rpm for 10min to obtain the reinforcing filler.
Preparation example 5
Preparation of reinforcing filler, 80g of the modified Kevlar fiber of preparation example 2, 60g of gamma-alumina fiber and 2g of silicon carbide whisker are weighed, placed in a high-speed dispersion kettle and mixed for 10min at the rotating speed of 80rpm, thus obtaining the reinforcing filler.
Preparation example 6
Preparation of reinforcing filler, 60g of the modified Kevlar fiber of preparation example 2, 60g of the gamma-alumina fiber and 2g of the silicon carbide whisker are weighed, placed in a high-speed dispersion kettle and mixed for 10min at the rotating speed of 80rpm, thus obtaining the reinforcing filler.
Preparation example 7
The organic silicon resin is prepared from KR-242A silicon resin, polytrifluoropropylmethylsiloxane, methanol and diethylenetriamine. Wherein the mass ratio of KR-242A silicon resin to poly (trifluoropropylmethylsiloxane) is 1: 0.2. the silicone resin was prepared from 40gKR-242A silicone resin, 8g of polytrifluoropropylmethylsiloxane, 60g of methanol and 0.1g of diethylenetriamine.
The preparation method of the organic silicon resin comprises the following steps: 0.02g of diethylenetriamine, 40g of KR-242A silicone resin and 8g of polytrifluoropropylmethylsiloxane are reacted at 65 ℃ for 120s in advance, the temperature is reduced to 4 ℃, 60g of methanol is added and stirred at 80rpm for 10min, 0.08g of diethylenetriamine is added and stirred at 40rpm for 2min to obtain the silicone resin.
Preparation example 8
The organic silicon resin is prepared from KR-242A silicon resin, polytrifluoropropylmethylsiloxane, methanol and diethylenetriamine. Wherein the mass ratio of KR-242A silicon resin to poly (trifluoropropylmethylsiloxane) is 1: 0.4. the silicone resin was prepared from 40gKR-242A silicone resin, 16g of polytrifluoropropylmethylsiloxane, 60g of methanol and 0.1g of diethylenetriamine.
The preparation method of the organic silicon resin comprises the following steps: 0.02g of diethylenetriamine, 40g of KR-242A silicone resin and 16g of polytrifluoropropylmethylsiloxane are reacted at 65 ℃ for 120s in advance, the temperature is reduced to 4 ℃, 60g of methanol is added and stirred at 80rpm for 10min, 0.08g of diethylenetriamine is added and stirred at 40rpm for 2min to obtain the silicone resin.
Preparation example 9
Preparation of reinforcing filler, 10g of the modified Kevlar fiber of preparation example 2, 60g of gamma-alumina fiber and 2g of silicon carbide whisker were weighed, placed in a high-speed dispersion vessel, and mixed at 80rpm for 10min to obtain the reinforcing filler.
Preparation example 10
Preparation of reinforcing filler 150g of the modified Kevlar fiber of preparation example 2, 60g of gamma-alumina fiber and 2g of silicon carbide whisker were weighed, placed in a high-speed dispersion vessel, and mixed at 80rpm for 10min to obtain the reinforcing filler.
Example 1
The mica part with high surface tear strength is formed by hot pressing of organic silicon resin and mica slurry, wherein the organic silicon resin is prepared in preparation example 7. The mica slurry is prepared from the following raw materials in parts by weight: 100 parts of the mica powder composition of preparation 3, 2 parts of the reinforcing filler of preparation 4 and 102 parts of methanol. Mass of solid content material in silicone resin: the mass sum of the mica powder composition and the reinforcing filler in the mica slurry is 3: 17.
A method for forming a mica part with high surface tear strength comprises the following steps:
s1, putting 1000g of the mica powder composition in the preparation example 3 into 4L of surface treatment agent liquid prepared from KH570 silane coupling agent and deionized water in a ratio of 1:200, carrying out ultrasonic treatment for 10min, wherein the ultrasonic frequency is 32kHz, filtering to remove the surface treatment agent, and filtering to obtain mica powder, and drying the mica surface moisture at a low temperature of 100 ℃ to obtain modified mica powder;
s2, weighing 833.3g of the modified mica powder in S1 and 16.7g of the reinforcing filler in preparation example 4, adding the materials into 850g of methanol, mixing the materials for 2min at 50rpm, adding 150g of the organic silicon resin in preparation example 7, and stirring the mixture for 5min at 180rpm to obtain mica product slurry;
s3, injecting the mica product slurry into a ceramic mold, wherein the ceramic mold is arranged between two polar plates of a parallel plate capacitor, the voltage of the parallel plate capacitor is controlled to be 12V, the distance between the parallel plate capacitor and the parallel plate capacitor is 15cm, the direction of an electric field of the parallel plate capacitor is the same direction as the height direction of the mold, the distance from the upper surface of the ceramic mold to the surface of the upper polar plate is equal to the distance from the lower surface of the ceramic mold to the surface of the lower polar plate, and the time for arranging the ceramic mold between the two polar plates of the parallel plate capacitor is controlled for 40min, so that the modified Kevlar fiber is displaced under the action of the electric field, and the axial direction of the modified Kevlar fiber is the same direction as the height direction of the mica product;
s4, when the ceramic mould is placed between two polar plates of the parallel plate capacitor, heating the ceramic mould to 75 ℃, evaporating the methanol in the mica product slurry, and controlling the heating time for 20 min;
s5, taking out the ceramic mold, and performing four-step hot pressing forming to obtain the mica product: in the first step of hot press molding, the hot pressing condition is that the temperature of a pressing plate is 80 ℃, the pressure is 0.25Mpa, and the duration is 60 s; the hot pressing conditions in the second step of hot pressing molding are that the temperature of a pressing plate is 135 ℃, the pressure is 0.5Mpa and the duration is 100s, and the hot pressing conditions in the third step of hot pressing molding are that the temperature of the pressing plate is 180 ℃, the pressure is 0.8Mpa and the duration is 150 s; fourthly, in the hot press molding, the hot press condition is that the temperature of a press plate is 120 ℃, the pressure is 0.5Mpa, and the duration is 60s, so that the mica product is prepared;
s6, carrying out heat treatment on the mica product in S5, heating to 55 ℃ at the heating rate of 1.5 ℃/min, preserving heat for 4min, heating to 85 +/-0.5 ℃ at the heating rate of 1.2 ℃/min, preserving heat for 80min, and naturally cooling to obtain the finished product.
Example 2
Example 2 differs from example 1 in that: the mica slurry is prepared from the following raw materials in parts by weight: 100 parts of the mica powder composition of preparation 3, 4 parts of the reinforcing filler of preparation 4 and 104 parts of methanol.
Example 3
Example 3 differs from example 1 in that: the mica slurry is prepared from the following raw materials in parts by weight: 100 parts of the mica powder composition of preparation 3, 6 parts of the reinforcing filler of preparation 4 and 106 parts of methanol.
Example 4
Example 4 differs from example 1 in that: the mica slurry is prepared from the following raw materials in parts by weight: 100 parts of the mica powder composition of preparation 3, 6 parts of the reinforcing filler of preparation 4 and 106 parts of methanol.
Example 5
Example 5 differs from example 2 in that: the silicone resin in preparation example 7 was replaced with the silicone resin in preparation example 8.
Example 6
Example 6 differs from example 2 in that: the reinforcing filler in preparation example 4 was replaced with the reinforcing filler in preparation example 5.
Example 7
Example 7 differs from example 2 in that: the reinforcing filler in preparation example 4 was replaced with the reinforcing filler in preparation example 6.
Example 8
Example 8 differs from example 6 in that: the silicone resin in preparation example 7 was replaced with the silicone resin in preparation example 8.
Example 9
Example 9 differs from example 8 in that: the organic silicon resin is prepared from KR-242A silicon resin, polytrifluoropropylmethylsiloxane, methanol and diethylenetriamine. Wherein the mass ratio of KR-242A silicon resin to poly (trifluoropropylmethylsiloxane) is 1: 0.3. the silicone resin was prepared from 40gKR-242A silicone resin, 12g of polytrifluoropropylmethylsiloxane, 60g of methanol and 0.1g of diethylenetriamine.
The preparation method of the organic silicon resin comprises the following steps: 0.02g of diethylenetriamine, 40g of KR-242A silicone resin and 12g of polytrifluoropropylmethylsiloxane are reacted at 65 ℃ for 120s in advance, the temperature is reduced to 4 ℃, 60g of methanol is added and stirred at 80rpm for 10min, 0.08g of diethylenetriamine is added and stirred at 40rpm for 2min to obtain the silicone resin.
Example 10
Example 10 differs from example 8 in that: the organic silicon resin is prepared from KR-242A silicon resin, FM-DA26 modified hydroxyl siloxane, polytrifluoropropylmethylsiloxane and methanol, wherein the KR-242A silicon resin: polytrifluoropropylmethylsiloxane: the mass ratio of FM-DA26 modified hydroxyl siloxane is 1: 0.24:0.16. The silicone resin was prepared from 100gKR-242A silicone resin, 24g of polytrifluoropropylmethylsiloxane, 16g of FM-DA26 modified hydroxysiloxane, 140g of methanol, and 0.2g of diethylenetriamine.
The preparation method of the organic silicon resin comprises the following steps: 0.05g of diethylenetriamine, 100g of KR-242A silicone resin, 24g of polytrifluoropropylmethylsiloxane and 16g of FM-DA26 modified hydroxysiloxane are reacted for 150s at 72 ℃, the temperature is reduced to 4 ℃, 60g of methanol is added and stirred for 10min at 80rpm, 0.15g of diethylenetriamine is added and stirred for 2min at 40rpm, and the silicone resin is obtained.
Comparative example 1
Comparative example 1 differs from example 1 in that: a method for forming a mica part with high surface tear strength comprises the following steps:
s1, putting 1000g of the mica powder composition in the preparation example 3 into 4L of surface treatment agent liquid prepared from KH570 silane coupling agent and deionized water in a ratio of 1:200, carrying out ultrasonic treatment for 10min, wherein the ultrasonic frequency is 32kHz, filtering to remove the surface treatment agent, and filtering to obtain mica powder, and drying the mica surface moisture at a low temperature of 100 ℃ to obtain modified mica powder;
s2, weighing 833.3g of the modified mica powder in S1 and 16.7g of the reinforcing filler in preparation example 4, adding the materials into 850g of methanol, mixing the materials for 2min at 50rpm, adding 150g of the organic silicon resin in preparation example 7, and stirring the mixture for 5min at 180rpm to obtain mica product slurry;
s3, pouring the mica product slurry into a mold, drying the mica product slurry in the mold for 60min at 75 ℃, and removing methanol;
s4, taking out the die, and performing four-step hot pressing forming to obtain the mica product: in the first step of hot press molding, the hot pressing condition is that the temperature of a pressing plate is 80 ℃, the pressure is 0.25Mpa, and the duration is 60 s; the hot pressing conditions in the second step of hot pressing molding are that the temperature of a pressing plate is 135 ℃, the pressure is 0.5Mpa and the duration is 100s, and the hot pressing conditions in the third step of hot pressing molding are that the temperature of the pressing plate is 180 ℃, the pressure is 0.8Mpa and the duration is 150 s; fourthly, in the hot press molding, the hot press condition is that the temperature of a press plate is 120 ℃, the pressure is 0.5Mpa, and the duration is 60s, so that the mica product is prepared;
s5, carrying out heat treatment on the mica product in S4, heating to 55 ℃ at the heating rate of 1.5 ℃/min, preserving heat for 4min, heating to 85 +/-0.5 ℃ at the heating rate of 1.2 ℃/min, preserving heat for 80min, and naturally cooling to obtain the finished product.
Comparative example 2
Comparative example 2 differs from comparative example 1 in that: the mica product in S4 was not heat-treated in S5.
Comparative example 3
Comparative example 3 differs from example 1 in that: the silicone resin in preparation example 7 was replaced with KR-242A silicone resin.
Comparative example 4
Comparative example 4 differs from example 1 in that: the reinforcing filler of preparation 4 was replaced with the reinforcing filler of preparation 9.
Comparative example 5
Comparative example 5 differs from example 1 in that: the reinforcing filler in preparation example 4 was replaced with the reinforcing filler in preparation example 10.
Performance test
Test methods in this application samples of the curable materials in this application were prepared according to GB/T5019.2-2009 mica product test method, according to method 4.3 of GB/T5019.2-2009 mica product test method, method 2.
1. And (3) testing the bending strength: GB/T5019.2-2009 mica product test method, item 11 "flexural strength and flexural modulus of elasticity" tests, the width of the test specimen is about 25mm, the test span is 16mm, the test speed is 50mm/min, and the radius of the pressure head is 5 mm.
2. And (3) electrical strength test: GB/T5019.2-2009 mica product test method, item 22, the "electrical strength" test, the sample thickness is 0.39 mm-0.41 mm, adopts phi 25 mm/phi 75mm cylindrical electrode system, rapid boost mode (boost speed is 1.0 kV/s), in 23 ℃ + -2 ℃ 25# transformer oil.
3. And (3) testing the density: GB/T5019.2-2009 mica article test method, item 6, "Density" was tested.
4. And (3) testing the glue content: the test was carried out in accordance with GB/T5019.2-2009, no 8.4.5 "Silicone adhesive non-reinforced Material (insoluble adhesive)".
5. Testing of surface tear resistance: 30 mica products of the same size of 268mm 142mm 2.5mm were prepared as test samples by the molding methods of examples 1 to 10 and comparative examples 1 to 5, respectively. And blowing the surface of the test sample clean by using an air gun, adhering a 3M adhesive tape on the surface of the test sample, uncovering release paper of the adhesive tape under the constant action of 10N, and observing the surface tearing condition of each sample. Breakage (%) = number of surface breaks 100/total number of tests
Data analysis
Table 1 shows the results of the parameters of examples 1 to 10 and comparative examples 1 to 5
Density g/cm3 Content of gum% Flexural strength Mpa Electric strength (kv/mm)
Example 1 2.03 7.3 211 38.9
Example 2 2.05 7.3 223 37.4
Example 3 2.06 7.3 225 35.7
Example 4 2.06 7.4 228 34.2
Example 5 2.05 7.4 215 37.5
Example 6 2.06 7.3 218 37.9
Example 7 2.04 7.4 215 38.3
Example 8 2.03 7.3 220 38.2
Example 9 2.05 7.4 218 38.0
Example 10 2.04 7.4 232 38.5
Comparative example 1 2.05 7.4 179 38.2
Comparative example 2 2.05 7.4 163 38.1
Comparative example 3 2.06 7.3 204 37.1
Comparative example 4 2.05 7.4 211 39.6
Comparative example 5 2.06 7.4 224 30.2
Table 2 shows the results of the tear resistance tests of examples 1 to 10 and comparative examples 1 to 5
Number of tests/number Number of surface breakings/number Breakage rate/%)
Example 1 30 1 3.33
Example 2 30 0 0
Example 3 30 0 0
Example 4 30 0 0
Example 5 30 0 0
Example 6 30 0 0
Example 7 30 0 0
Example 8 30 0 0
Example 9 30 0 0
Example 10 30 0 0
Comparative example 1 30 5 16.7
Comparative example 2 30 8 26.7
Comparative example 3 30 3 10.0
Comparative example 4 30 3 10.0
Comparative example 5 30 0 0
Combining examples 1-10 and comparative examples 1-5 with Table 1, it can be seen that the flexural strength of the mica products prepared in examples 1-4 is better than that of the mica product prepared in comparative example 1, and the electrical strength of the mica product prepared in example 1 is slightly better than that of the mica product prepared in comparative example 1, therefore, the operation of S3 in example 1 is adopted, which is beneficial to improving the mechanical properties of the mica product. As can be seen from table 2, the surface breakage rate of the mica product prepared in example 1 is 3.33%, and the surface breakage rate of the mica product prepared in comparative example 1 is 16.7%, so that the operation of S3 in example 1 is beneficial to improving the surface tearing strength of the mica product.
As can be seen by combining examples 1-10 and comparative examples 1-5 with Table 1, the electrical strength of the mica products prepared in examples 1-4 was 38.9, 37.4, 35.7, 34.2 kv/mm, and the electrical strength of the mica products tended to decrease with the increase of the amount of the reinforcing filler; as can be seen from Table 2, the surface breakage of the mica product prepared in example 1 was 3.33%, and the surface breakage of the mica products prepared in examples 2 to 4 was 0%, so that the surface tear strength of the mica product tended to increase with the increase in the amount of the reinforcing filler. As can be seen from a combination of tables 1-2, the flexural strength of the mica product prepared in example 2 is superior to that of the mica product prepared in comparative example 4, however, the electrical strength of the mica product prepared in example 2 was inferior to that of the mica product prepared in comparative example 4, the breakage rate of the mica product prepared in example 2 was 0, while the breakage rate of the mica product prepared in comparative example 4 was 10%, the bending strength of the mica product prepared in example 2 was similar to that of the mica product prepared in comparative example 5, but the electrical strength of the mica product prepared in example 2 was stronger than that of the mica product prepared in comparative example 4, therefore, the mass ratio of the mica powder composition to the reinforcing filler is preferably 100:2-8, the prepared mica product has high surface tearing strength and relatively good electrical strength and mechanical property.
As can be seen by combining examples 1-10 and comparative examples 1-5 with tables 1-2, the difference in flexural strength between the mica products prepared in examples 1, 5 and 9 is small, and the difference in electrical strength between the three is small; the flexural strength of the mica articles prepared in examples 1, 5 and 9 was superior to that of the mica article prepared in comparative example 2, and therefore, the mass ratio of KR-242A silicone resin to polytrifluoropropylmethylsiloxane was 1: the organic silicon resin prepared by (0.2-0.4) can ensure that the prepared mica product is easy to peel off from release paper and has good mechanical property and high insulating property.
As can be seen by combining examples 1-10 and comparative examples 1-5 with tables 1-2, the bending strength of the mica product prepared in example 9 is better than that of the mica products prepared in examples 1 and 5, and the difference between the electrical strengths of the three is small, so that the mass ratio of KR-242A silicone resin, polytrifluoropropylmethylsiloxane and FM-DA26 modified hydroxysiloxane is 1: 0.24: the organic silicon resin prepared by 0.16 not only ensures that the prepared mica product is easy to peel off from release paper, but also can improve the mechanical property of the mica product.
As can be seen by combining examples 1-10 and comparative examples 1-5 with Table 1, the electrical strength of the mica product prepared in example 2 is increased with the decrease of the Kevlar fiber ratio in the reinforcing filler, while the electrical strength of the mica product prepared in example 2 is decreased with the decrease of the Kevlar fiber ratio in the reinforcing filler, and the electrical strength of the mica product prepared in example 2 is decreased with the decrease of the Kevlar fiber ratio in the reinforcing filler, and, as can be seen from the combination of Table 2, the mica products prepared in examples 2, 5 and 6 had a breakage rate of 0%, therefore, the mass ratio of the modified Kevlar fiber to the gamma-alumina fiber to the silicon carbide whisker in the reinforcing filler is (6-10): (6-8): 0.2, the prepared mica product has high surface tearing strength and relatively good electrical strength and mechanical property.
In conclusion, the reinforcing filler adopted by the application contains the modified Kevlar fiber with certain conductive performance, so that although the electrical strength of the prepared mica product is reduced, the processing technology can change the arrangement direction of the modified Kevlar fiber, reduce the influence on the electrical strength of the mica product, effectively improve the surface tearing resistance of the mica product, improve the mechanical property of the mica product, and effectively solve the problem that the mica product is scrapped due to the surface damage of the mica product caused by the uncovering of the release paper.
The best mode given in the application is as follows: the silicone resin is the silicone resin prepared in preparation example 8, the reinforcing filler is the reinforcing filler in preparation example 5, the mica powder composition is the mica powder composition in preparation example 3, the mass ratio of the silicone resin to the mica slurry is 3:17, the mass ratio of the mica powder composition to the reinforcing filler in the mica slurry is 100:4, and the forming process in example 1 is combined, so that the prepared mica product has the glue content of 7.4 percent and the density of 2.06g/cm3The flexural strength was 224MPa, the electrical strength was 38.5kv/mm, and the breakage rate was 0%.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (8)

1. A mica having a high surface tear strength, characterized by: the mica piece main body is prepared from organic silicon resin and mica slurry; the mica slurry is prepared from the following raw materials in parts by weight: 100 parts of mica powder composition, 2-8 parts of reinforcing filler and 80-120 parts of organic solvent; the reinforced filler mainly comprises modified Kevlar fibers; the modified Kevlar fibers are vertically distributed in the mica part main body; the modified Kevlar fiber consists of Kevlar fiber and a modified coating coated on the outer wall of the Kevlar fiber; the Kevlar fiber has the specification of 100-300D and the length of 0.1-1.0 mm; the modified coating is prepared from a modified coating, and the modified coating is prepared from the following raw materials in percentage by mass: 20-25% of water-based polyurethane, 2-5% of nonionic dispersant, 0.5-3% of non-silicone mineral oil defoamer, 2-5% of organic silicon base material wetting agent, 1-3% of propylene glycol phenyl ether, 0.5-2% of pH regulator, 20-40% of deionized water and 5-25% of toughening filler; the toughening filler comprises graphene; the preparation method of the modified Kevlar fiber comprises the following steps:
s1, placing the Kevlar fiber in 3.0-8.0% ethanol water solution, carrying out ultrasonic treatment for 200-400S, washing with water, and drying for later use;
s2, performing plasma surface treatment on the Kevlar fiber in the S1, wherein the treatment temperature is 0-15 ℃, the gas medium is oxygen, and the treatment time is controlled to be 10-15 min;
s3, preparing a modified coating, spraying the modified coating on the outer wall of the Kevlar fiber in the S2, curing at 60-75 ℃, and forming a modified coating on the outer wall of the Kevlar fiber to obtain the modified Kevlar fiber.
2. A mica with high surface tear strength as defined in claim 1 wherein: the organic silicon resin comprises KR-242A silicon resin and a fluorine-containing surface modifier; the mass ratio of the KR-242A silicon resin to the fluorine-containing surface modifier is 1: (0.2-0.4).
3. A mica with high surface tear strength as defined in claim 2 wherein: the fluorine-containing surface modifier is fluorine-containing polysiloxane or a mixture of fluorine-containing polysiloxane and end-capping modified polysiloxane.
4. A mica with high surface tear strength as defined in claim 3 wherein: the fluorine-containing polysiloxane is poly (trifluoropropylmethylsiloxane); the end-capped modified polysiloxane is FM-DA26 modified hydroxyl siloxane with the molecular weight of 15000; the mass ratio of the polytrifluoropropylmethylsiloxane to the FM-DA26 modified hydroxysiloxane is (6-8) to (2-4).
5. A mica with high surface tear strength as defined in claim 1 wherein: the reinforcing filler consists of modified Kevlar fibers, gamma-alumina fibers and silicon carbide whiskers; the mass ratio of the modified Kevlar fiber to the gamma-alumina fiber to the silicon carbide whisker is (6-10): (6-8): 0.2.
6. a mica with high surface tear strength as defined in claim 1 wherein: the toughening filler consists of synthetic mica, graphene, zirconium oxide and yttrium oxide; the mass ratio of the synthetic mica to the graphene to the zirconium oxide to the yttrium oxide is 20: (8-10): 4: 1.
7. a method of forming a mica part with high surface tear strength as claimed in any one of claims 1 to 6, wherein: the method comprises the following steps:
s1, weighing the mica powder composition according to the proportion, adding 2.0-5.0g/L mica surfactant aqueous solution, and carrying out ultrasonic treatment for 5-10min to obtain a modified mica mixture;
s2, uniformly mixing the modified mica mixture, the reinforcing filler and the organic solvent, adding the organic silicon resin, and uniformly stirring to obtain mica slurry;
s3, injecting the mica slurry into a forming mold, placing the forming mold between two pole plates of a capacitor, enabling the direction of an electric field of the capacitor and the height direction of the mold to be in the same direction, placing for 30-60min, and heating the mold to remove the organic solvent in the mica slurry in the placing process;
and S4, taking out the die, and carrying out hot press molding to obtain the mica product.
8. The method for forming a mica part with high surface tear strength according to claim 7, wherein: and S5, performing heat treatment on the mica product in S4, heating to 55 ℃ at a heating rate of 1.0-2.0 ℃/min, preserving heat for 4-6min, heating to 85 +/-5 ℃ at a heating rate of 1.0-2.0 ℃/min, preserving heat for 60-90min, and naturally cooling to obtain the finished product.
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CN114188092B (en) * 2021-12-02 2022-06-28 浙江荣泰电工器材股份有限公司 Processing technology of special-shaped mica insulation product
CN114188072B (en) * 2021-12-02 2022-06-17 浙江荣泰电工器材股份有限公司 Special-shaped mica insulation product suitable for three-dimensional modeling and preparation method thereof
CN114395342B (en) * 2022-01-27 2023-05-09 浙江合特光电有限公司 Water vapor barrier fireproof flexible back plate and preparation method thereof
CN114516138B (en) * 2022-02-08 2023-06-27 浙江荣泰电工器材股份有限公司 Preparation method of conical mica tube
CN114456729B (en) * 2022-02-09 2023-05-30 浙江荣泰电工器材股份有限公司 High-temperature-resistant and reusable mica tape and preparation method thereof
CN114163777B (en) * 2022-02-11 2022-06-28 浙江荣泰电工器材股份有限公司 Mica composite material of internal-added short fibers for new energy automobile and preparation process
CN114312604B (en) * 2022-03-11 2022-06-17 浙江荣泰电工器材股份有限公司 Upper cover thermal runaway protection mica structural member for new energy automobile and preparation method thereof
CN114361740B (en) * 2022-03-19 2022-06-17 浙江荣泰电工器材股份有限公司 Be applied to thermal runaway protection low heat conduction mica composite between electric core
CN114523741B (en) * 2022-04-19 2022-07-29 浙江荣泰电工器材股份有限公司 High-strength high-tensile high-modulus mica plate for thermal runaway management of new energy automobile

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