WO2019093305A1 - 絶縁シート - Google Patents
絶縁シート Download PDFInfo
- Publication number
- WO2019093305A1 WO2019093305A1 PCT/JP2018/041132 JP2018041132W WO2019093305A1 WO 2019093305 A1 WO2019093305 A1 WO 2019093305A1 JP 2018041132 W JP2018041132 W JP 2018041132W WO 2019093305 A1 WO2019093305 A1 WO 2019093305A1
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- WO
- WIPO (PCT)
- Prior art keywords
- aramid
- sheet
- present
- insulating sheet
- filler
- Prior art date
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Classifications
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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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/02—Metal coatings
- D21H19/06—Metal coatings applied as liquid or powder
-
- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/34—Ignifugeants
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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
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
- H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board
Definitions
- the present invention relates to an insulating sheet used for electrical devices such as transformers, generators and motors.
- insulating sheets such as insulating paper are also diversified.
- Paper made of cellulose fiber is widely used as an inexpensive electric insulating material because it is excellent in electric insulation, and is used as a capacitor, a transformer, a wire covering material, and the like.
- insulating paper mainly composed of cellulose fiber is made using deionized water for the purpose of removing residual ions in the insulating paper, high humidity environment is required in addition to the need for dedicated equipment. Below this, the cellulose fiber absorbs moisture, and the amount of equilibrium water in the insulating paper increases, which causes a problem that the electrical insulation property decreases.
- each fiber width of aromatic polyamide floc and fibrid is set as a predetermined range, and relatively thin fibers having a predetermined width or less are blended in a predetermined ratio in the fibrid (patent document 2).
- Patent Document 3 by blending hydrotalcite in the paper making process of aramid-based insulating paper, it is possible to suppress deterioration when the insulating paper comes in contact with a metal such as iron or copper under high temperature conditions. .
- hydrotalcite When hydrotalcite is compounded in the papermaking process of insulating paper, the hydrotalcite is mainly present in the insulating paper in the form of particles that intervene between the fibers.
- hydrotalcite particles when hydrotalcite particles are present in a large amount in the interior of the insulating paper in such a form, the entanglement of the fibers is prevented and the strength of the insulating paper is reduced, or due to the presence of hydrotalcite between the fibers. Problems such as a decrease in insulation due to an increase in air gap (increase in air permeability) may occur.
- problems such as a decrease in insulation due to an increase in air gap (increase in air permeability) may occur.
- the particles may fall off when the insulating paper is processed by heat pressure or the like.
- the object of the present invention is to provide an insulating sheet which can suppress deterioration even when it comes in contact with metal under high temperature conditions, does not fall off particles, and has excellent electrical insulation and excellent strength. Do.
- the present invention A sheet substrate comprising aramid floc having an average fiber width of 10 to 30 ⁇ m and aramid fibrid having an average fiber width of 5 to 40 ⁇ m, Fine binder fibers having an average fiber width of less than 5 ⁇ m present on at least the surface of the sheet substrate, and
- the present invention relates to an insulating sheet containing at least one filler present on at least the surface of the sheet substrate.
- the insulating sheet of the present invention preferably has a dielectric strength of 15 kV / mm or more and a specific tear strength of 25 mN ⁇ m 2 / g or more.
- the fine binder fiber is preferably subjected to a homogenizer treatment or a refiner treatment.
- the insulating sheet of the present invention can comprise a layer comprising the fine binder fiber and the filler on the sheet substrate.
- At least one of the aramid floc, the aramid fibrid and the fine binder fiber be meta-aramid.
- the amount of aramid floc in the sheet substrate can be 80 to 20 wt% based on the weight of the sheet substrate.
- the amount of aramid fibrids in the sheet substrate may be 20 to 80 wt% based on the weight of the sheet substrate.
- the weight ratio of the aramid floc to the aramid fibrid is preferably 20:80 to 80:20.
- the filler is preferably an inorganic particle.
- the inorganic particles preferably contain a bismuth compound.
- the insulating sheet of the present invention it is preferable that at least a part of the aramid floc and at least a part of the aramid fibrid be thermally adhered.
- the insulating sheet of the present invention preferably has a basis weight of 20 to 1000 g / m 2 .
- the invention also relates to an electrical insulator comprising said insulating sheet as well as to an electrical device comprising said electrical insulator, for example a transformer, a generator or a motor.
- the insulating sheet of the present invention can suppress deterioration even when in contact with metal under high temperature conditions, and has excellent electrical insulation and excellent strength.
- the insulating sheet of the present invention is less likely to fall off the filler (particles) from the sheet surface, and does not impair the workability when heat-pressing the insulating sheet or processing it as an insulating member.
- a sheet substrate comprising aramid floc having an average fiber width of 10 to 30 ⁇ m and aramid fibrid having an average fiber width of 5 to 40 ⁇ m, Fine binder fibers having an average fiber width of less than 5 ⁇ m present on at least the surface of the sheet substrate, and
- An insulating sheet containing at least one kind of filler present on at least the surface of the sheet base material can suppress deterioration even when it comes in contact with metal under high temperature conditions, and there is no dropout of the filler and excellent electric It found that it had insulation and excellent strength, and completed the present invention.
- the present inventors allow a filler, which is preferably an inorganic particle, more preferably an inorganic particle containing a bismuth compound, to be present, together with a fine binder fiber, on at least the surface of aramid fibrids and aramid flocs.
- a filler which is preferably an inorganic particle, more preferably an inorganic particle containing a bismuth compound, to be present, together with a fine binder fiber, on at least the surface of aramid fibrids and aramid flocs.
- the filler may be present on at least a part (preferably all) of at least the surface of the sheet substrate, and may be present on the sheet substrate as long as it is present on the surface of the sheet substrate. .
- the amount of the filler present in the sheet base be small. Therefore, in the present invention, it is preferable that the filler is not blended in the production process of the sheet substrate.
- the fine binder fiber has an effect of causing the filler to be present on at least the surface of the sheet substrate.
- the insulating sheet of the present invention can also have excellent electrical insulation. Furthermore, when fine binder fibers are present (preferably filled) in the fine voids in the sheet base material, the discharge in the voids can be reduced or prevented, and the electrical insulation property is further improved. it can. Further, since the insulating sheet of the present invention is not manufactured only by the fine binder fiber, the manufacturing efficiency is not reduced and the strength is not reduced.
- the adhesion with the sheet substrate is high, and there is also an advantage that the performance such as insulation and heat resistance is not impaired.
- the insulating sheet of the present invention preferably comprises a layer comprising the fine binder fiber and the filler on the sheet substrate.
- seat base material in the insulation sheet of this invention says that "it consists of an aramid floc and an aramid fibrid” when the said sheet base consists only of the said aramid floc and the said aramid fibrid, and the said aramid floc. It is a meaning which includes both the case where it consists of said aramid fibrid, and also when it contains the component other than these.
- the “layer comprising fine binder fiber and filler” in the insulating sheet of the present invention is a layer comprising only the fine binder fiber and the filler, and the fine binder fiber and the filler other than these components. Includes both layers including
- aromatic polyamide means aromatic polyamide.
- aromatic polyamide is chemically structured so that at least 60 mol%, preferably at least 70 mol%, more preferably at least 80 mol%, even more preferably at least 90 mol% of the amide bond is aromatic. It means a linear polymer compound directly bonded to a ring.
- Aramids are classified into para-aramids, meta-aramids and copolymers thereof depending on the substitution position of the amide group on the benzene ring.
- para-aramid include poly-p-phenylene terephthalamide and copolymers thereof, poly (p-phenylene) -co-poly (3,4'-diphenyl ether) terephthalamide (poly (p-phenylene) -co-poly (3,4'-diphenyl ether) terephthalamide Etc. are illustrated.
- meta-aramids include poly (meta-phenylene isophthalamide) and copolymers thereof.
- Meta-aramid is preferably selected. Meta-aramid is characterized by being soluble in general-purpose amide solvents, being able to be wet-formed using a polymer solution as a starting material, being excellent in heat fusion property, being excellent in heat resistance and flame resistance, etc. .
- poly (meta-phenylene isophthalamide) is preferably used in that it has characteristics such as good moldability, heat adhesion, flame retardancy, heat resistance and the like.
- the aramid floc, the aramid fibrid and the fine binder fiber be meta-aramid.
- Aramid floc is a short fiber made of aramid.
- the (number) average fiber length of the aramid floc in the present invention is preferably in the range of 1 to 50 mm, more preferably in the range of 2 to 40 mm, and still more preferably in the range of 3 to 30 mm. If the average fiber length is smaller than 1 mm, the strength of the insulating sheet may be reduced. When the average fiber length exceeds 50 mm, “flocking” and “union” of flocks are easily generated in the insulating sheet, which may cause defects, which is not preferable.
- the average fiber length of aramid floc can be obtained, for example, by averaging lengths of a predetermined number (for example, 100) of aramid floc. Specifically, lengths of aramid floc present in a predetermined area range (for example, 55 mm 2 ) on the surface of the sheet substrate may be measured by stereomicroscope observation or the like and averaged.
- the sheet substrate of the insulating sheet of the present invention contains aramid floc.
- the aramid floc in the present invention has a (number) average fiber width of 10 to 30 ⁇ m.
- the average fiber width of the aramid floc is preferably 12 to 28 ⁇ m, more preferably 14 to 26 ⁇ m, and still more preferably 16 to 24 ⁇ m.
- the average fiber width of the aramid floc can be obtained, for example, by averaging the width of a predetermined number (for example, 100) of aramid floc.
- the width of the aramid floc present in a predetermined area range (for example, 60,000 ⁇ m 2 ) on the surface of the sheet substrate may be measured by SEM observation or the like and averaged.
- the fineness of the aramid floc is preferably 0.1 to 10 denier, more preferably 0.5 to 8 denier, and even more preferably 1 to 6 denier.
- "denier” is a unit expressed in mass (gram) per 9000 m of fiber. If the fineness is less than 0.1 denier, entanglement in water may be increased, which may lead to a decrease in the performance of the insulating sheet. On the other hand, when the fineness exceeds 10 deniers, the diameter of the flock becomes too large, which is not preferable because there is a possibility that the reduction of the aspect ratio, the reduction of the mechanical reinforcement effect, and the poor uniformity of the insulating sheet.
- the aramid floc used in the present invention preferably comprises meta-aramid.
- meta-aramid poly (meta-phenylene isophthalamide) and a copolymer thereof are preferable, and, for example, they can be produced by co-condensing polymerization of m-phenylene diamine and isophthalic acid chloride.
- the meta-aramid floc is commercially available, and for example, Teijin Limited's Conex (registered trademark) can be used, but is not limited thereto.
- the sheet substrate of the insulating sheet of the present invention comprises aramid fibrids.
- "Aramid fibrids” are fine particles in the form of films or fibers made of aramid, and may be referred to as aramid pulps (for aramid fibrids, Japanese Patent Publication No. 35-11851, Japanese Patent Publication No. 37-5752) See etc.). Fibrids have the same papermaking properties as ordinary wood (cellulose) pulps, and therefore can be formed into a sheet by a paper machine after being dispersed in water.
- the aramid fibrid used in the present invention preferably comprises meta-aramid.
- meta-aramid poly (meta-phenylene isophthalamide) and a copolymer thereof are preferable, and, for example, they can be produced by co-condensing polymerization of m-phenylene diamine and isophthalic acid chloride.
- the meta-aramid fibrid can be produced by a wet precipitation method according to the method described in, for example, Japanese Patent Publication No. 35-11851, which is a solution containing meta-aramid.
- the aramid fibrids can be subjected to so-called refining treatment for the purpose of maintaining the quality suitable for papermaking, as with ordinary wood pulp.
- This refining treatment can be carried out by a papermaking material processing device that exerts a mechanical cutting action, such as a disc refiner or beater.
- the aramid fibrids according to the invention have a (number) average fiber width of 5 to 40 ⁇ m.
- the average fiber width of the aramid fibrids is preferably 5 to 35 ⁇ m, more preferably 6 to 30 ⁇ m, and still more preferably 6 to 19 ⁇ m.
- the average fiber width of the aramid fibrid can be obtained, for example, by averaging the width of a predetermined number (for example, 100) of aramid fibrids.
- the widths of the aramid fibrids present in a predetermined area range (for example, 60,000 ⁇ m 2 ) on the surface of the sheet substrate may be measured by SEM observation or the like and averaged.
- the length of the aramid fibrid in the present invention is not particularly limited.
- the range of 100 to 2000 ⁇ m is preferable, the range of 200 to 1500 ⁇ m is more preferable, and the range of 300 to 1000 ⁇ m is still more preferable.
- the sheet substrate of the insulating paper of the present invention is a porous sheet mainly composed of aramid floc and aramid fibrid, and has a large number of voids.
- the form of the sheet-like material is not particularly limited, and various forms such as woven fabric, non-woven fabric, paper and the like can be mentioned, but the form of paper is preferable.
- the diameter (pore diameter) of the sphere is preferably 0.1 to 10 ⁇ m, more preferably 1 to 8 ⁇ m, and still more preferably 2 to 6 ⁇ m.
- the thickness of the sheet substrate is preferably 10 to 1000 ⁇ m, more preferably 20 to 800 ⁇ m, and still more preferably 30 to 500 ⁇ m.
- the basis weight of the sheet substrate is preferably 10 ⁇ 1000g / m 2, more preferably 20 ⁇ 500g / m 2, even more preferably 30 ⁇ 300g / m 2.
- the sheet substrate preferably contains 20 to 80% by weight, more preferably 30 to 70% by weight, and preferably 40 to 60% by weight of aramid floc based on the total weight (total weight) of the sheet substrate. Is even more preferred.
- the sheet substrate preferably contains 20 to 80% by weight, more preferably 30 to 70% by weight, and still more preferably 40 to 60% by weight of the aramid fibrid based on the total weight of the sheet substrate. preferable.
- the mixing ratio of aramid floc and aramid fibrid in the sheet substrate can be arbitrary, the mixing ratio (weight ratio) of aramid floc / aramid fibrid is preferably 20:80 to 80:20, and 30:70 to 70:30 is more preferred, and 40:60 to 60:40 is even more preferred.
- the sheet substrate can be produced, for example, by a method of mixing aramid floc and aramid fibrids and then sheeting. Specifically, for example, after dry mixing of aramid floc and aramid fibrid, a method of forming a sheet using air flow; aramid floc and aramid fibrid are dispersed and mixed in a liquid medium such as water to obtain a slurry After that, the slurry can be discharged onto a support such as a liquid-permeable mesh or belt to form a sheet, and the liquid medium can be removed and dried. The latter is preferred, and water is preferably used.
- the so-called wet sheet-forming method which is used as a liquid medium, is preferred.
- a method (wet sheet-making method) is generally adopted, in which an aqueous slurry containing at least aramid floc and aramid fibrids is supplied to a paper machine and dispersed, followed by dewatering, water squeezing and drying. is there.
- a papermaking machine a fourdrinier papermaking machine, a cylinder papermaking machine, an inclined type papermaking machine, a combination papermaking machine combining these, etc. can be used.
- composite sheets composed of a plurality of paper layers can be obtained by sheet-forming and combining slurries of different blending ratios.
- additives such as a dispersibility improver, an antifoaming agent, a paper strength agent and the like are used as needed.
- the sheet base material obtained as described above may improve density, crystallinity, heat resistance, dimensional stability, mechanical strength, etc., for example, by hot pressing at high temperature and high pressure between a pair of rolls. it can.
- at least a part of the aramid floc and at least a part of the aramid fibrid be thermally fused.
- conditions of heat and pressure can be exemplified at a temperature of 100 to 350 ° C. (preferably 200 to 350 ° C.) and a linear pressure of 50 to 400 kg / cm, but are limited thereto It is not something to be done.
- the above-mentioned heat-pressing process can also be performed multiple times in arbitrary order.
- the insulating sheet of the present invention comprises fine binder fibers having an average fiber width of less than 5 ⁇ m, present on at least the surface of the sheet substrate.
- the fine binder fibers may be present only on the surface of the sheet substrate, but may be present in the sheet substrate. Specifically, the fine binder fibers may be present in fine voids in the sheet substrate.
- the form of presence of the fine binder fiber in the case of being present in the fine voids of the sheet substrate is not particularly limited, and, for example, the void may be filled with at least one fine binder fiber.
- the entire length of the fine binder fiber does not have to be included in the void, and a part of the fine binder fiber may be present in the void. Also, the air gap may not be completely filled.
- the average fiber width of the fine binder fiber is preferably less than 4.5 ⁇ m, more preferably less than 4.0 ⁇ m, still more preferably less than 3.5 ⁇ m, still more preferably less than 3.0 ⁇ m, and further less than 2.5 ⁇ m More preferable.
- the average fiber width of the fine binder fiber is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, still more preferably 0.3 ⁇ m or more, still more preferably 0.4 ⁇ m or more, further 0.5 ⁇ m or more preferable.
- the average fiber width of the fine binder fiber is preferably 0.1 to less than 4.5 ⁇ m, more preferably 0.2 to less than 4 ⁇ m, still more preferably 0.3 to less than 3.5 ⁇ m, and 0.4 to Less than 3.0 ⁇ m is even more preferred, and less than 0.5 to 2.5 ⁇ m is even more preferred.
- the average fiber width can be obtained, for example, by averaging the widths of a predetermined number (for example, 100) of fine binder fibers.
- the widths of the fine binder fibers present in a predetermined area range (for example, 60,000 ⁇ m 2 ) on the surface of the insulating sheet of the present invention may be measured by SEM observation or the like and averaged.
- the length of the fine binder fiber in the present invention is not particularly limited.
- the range of 100 to 2000 ⁇ m is preferable, the range of 200 to 1500 ⁇ m is more preferable, and the range of 300 to 1000 ⁇ m is still more preferable.
- the fine binder fiber is preferably an organic fine fiber, more preferably an organic polymer fine fiber, further having high heat resistance (for example, a melting point of 150 ° C. or more, preferably 200 ° C. or more, More preferably, the melting point is 250 ° C. or higher).
- aramid floc or aramid fibrid other aramid (for example, para-aramid)
- polyethylene terephthalate and copolymer thereof polybutylene terephthalate and copolymer thereof
- coalescing cellulose such as microfibril cellulose or cellulose nanofiber
- fibers of polymetaphenylene isophthalamide are preferred.
- one type of fiber may be used, or two or more types may be used in combination (so-called mixed paper).
- the fine binder fiber is preferably a fine aramid fiber composed of aramid similar to aramid floc and / or aramid fibrid.
- a fine aramid fiber can be produced, for example, by subjecting an aramid fibrid to a refining treatment.
- the type of the refining process is not particularly limited, and may be, for example, non-mechanical refining process such as ultrasonication, but a homogenizer process or a refiner process is preferable. Double disc refiner or conical refiner processing is more preferred. Therefore, it is particularly preferable that the fine aramid fibers have been subjected to double disc refiner or conical refiner treatment.
- the insulating sheet of the present invention preferably comprises a layer comprising fine binder fibers and a filler to be described later.
- the amount of the binder fibers in the layer can be 5 to 80% by weight based on the weight of the layer, and It can be 10 to 60% by weight and also 15 to 40% by weight.
- the weight ratio of the fine binder fiber to the filler described below in the layer may be 5:90 to 90: 5.
- the amount of the fine binder fiber in the insulating sheet of the present invention is not particularly limited, but may be, for example, 0.01 to 30% by weight with respect to the total weight (total weight) of the insulating sheet. 0.1 to 20% by weight is preferable, 0.5 to 10% by weight is more preferable, and 1 to 5% by weight is even more preferable.
- the insulating sheet of the present invention contains at least one filler (filler) present on at least the surface of the sheet substrate.
- the filler has the form of particles.
- the type of the filler is not particularly limited, but inorganic particles are preferable.
- inorganic particles are preferable.
- talc silica, mica (mica), graphite, clay such as sericite kaolin bentonite hydrotalcite, carbon nanotube, aluminum nitride
- inorganic fillers such as aluminum oxide, boron nitride, calcium carbonate, magnesium hydrogencarbonate, barium sulfate, magnesium oxide, zinc oxide and the like.
- the filler is preferably not blended in the sheet-making process of the sheet substrate.
- the filler may be hydrotalcite unless it is blended in the papermaking process of the sheet substrate, but if the filler is blended in the papermaking process of the sheet substrate, the filler is preferably not hydrotalcite.
- the filler is preferably a compound of manganese, zinc, bismuth, or aluminum, and more preferably a bismuth compound. It is even more preferred that the filler is a bismuth compound.
- the bismuth compound is not particularly limited, but bismuth oxide, hydrated oxide, hydroxide, and salts of bismuth such as nitrate, secondary nitrate, carbonate, secondary carbonate and the like may be mentioned.
- bismuth oxide, bismuth hydroxide, bismuth subnitrate, bismuth subcarbonate, and further, other compounds of bismuth which can generate bismuth oxide by thermal decomposition can be mentioned.
- the insulating sheet of the present invention preferably comprises a layer comprising fine binder fibers and a filler.
- the said filler may be contained in a sheet
- the amount of said filler in said layer consisting of fine binder fibers and fillers may be 20 to 95% by weight based on the weight of said layer, further 40 to 90% by weight and 60 to 85% by weight Can be.
- the weight ratio of the filler to the fine binder fibers in the layer may be 20:80 to 80:20.
- the insulating sheet of the present invention may be provided with a layer consisting of only a filler.
- a layer consisting only of the fine binder fiber on the surface of the layer consisting only of the filler.
- the said filler may be contained in a sheet
- the amount of the filler in the insulating sheet of the present invention is not particularly limited, but may be, for example, 0.01 to less than 30% by weight with respect to the total weight (total weight) of the insulating sheet. 0.1 to less than 20% by weight is preferable, 0.5 to less than 10% by weight is more preferable, and 1 to 5% by weight is even more preferable.
- the insulating sheet of the present invention can be produced, for example, by coating one side or both sides of a sheet substrate with fine binder fibers and a filler.
- fine binder fibers and a filler are dry-dispersed as they are on the surface of a sheet substrate, or fine binder fibers and a filler are dispersed in a liquid medium such as water to form a coating solution And the fine binder fiber and the filler are wet-dispersed on the sheet substrate.
- the coating solution is dried to remove the liquid medium.
- dry spraying or wet spraying can form a layer consisting of fine binder fibers and fillers on one side or both sides of the sheet substrate.
- wet spreading can easily form a layer consisting of fine binder fibers and fillers.
- the liquid medium may be removed by suction through the voids of the sheet substrate.
- the fine binder fibers and the filler are easily sucked into the voids of the sheet base material, and it becomes difficult to cause the fine binder fibers and the filler to be present on the surface of the sheet base material, which is not preferable.
- the thickness of the layer is the thickness of the sheet substrate. Less than.
- the thickness of the layer comprising fine binder fibers is, for example, preferably 1 to 300 ⁇ m, more preferably 2 to 200 ⁇ m, and still more preferably 3 to 100 ⁇ m.
- the layer consisting of fine binder fiber and filler may be present in at least a part of the sheet substrate, but is preferably present in at least 50% of the surface of the sheet substrate, more preferably at least 80%. Preferably, at least 90% is even more preferred to be present.
- the insulating sheet obtained as described above can improve density, crystallinity, heat resistance, dimensional stability, mechanical strength, etc., for example, by hot pressing at high temperature and high pressure between a pair of rolls.
- the conditions of the heat and pressure may be, for example, in the range of 100 to 350 ° C. (preferably 200 to 350 ° C.) and a linear pressure of 50 to 400 kg / cm when a metal roll is used. Pressing can also be performed multiple times in any order.
- the fine binder fibers are present on the surface of the sheet substrate mainly composed of the aramid floc and the aramid fibrid and / or in the voids in the sheet substrate, and the sheet
- the insulation sheet of the present invention can have a dielectric strength of 15 kV / mm or more and a specific tear strength of 25 mN ⁇ m 2 / g or more. 16 kV / mm or more is preferable and, as for the dielectric strength of the insulation sheet of this invention, 17 kV / mm or more is still more preferable. 30 mN * m ⁇ 2 > / g or more is preferable, and, as for the specific tear strength of the insulation sheet of this invention, 35 mN * m ⁇ 2 > / g or more is more preferable.
- the dielectric strength and the specific tear strength are usually in a trade-off relationship. Therefore, for example, when the compounding ratio of aramid fibrids is increased to enhance the dielectric strength, the specific tearing strength is decreased, whereas when the compounding ratio of aramid floc is increased to increase the specific tear strength, the dielectric strength is decreased.
- fine binder fibers coat the surface of the sheet substrate and / or fill voids in the sheet substrate to improve the dielectric strength by using the aramid fibrids.
- the thickness of the insulating sheet of the present invention is preferably 10 to 1200 ⁇ m, more preferably 20 to 1000 ⁇ m, and still more preferably 30 to 800 ⁇ m.
- the basis weight of the insulating sheet of the present invention is preferably 10 ⁇ 1500g / m 2, more preferably 20 ⁇ 1000g / m 2, even more preferably 30 ⁇ 500g / m 2.
- the insulating sheet of the present invention can further optionally contain at least one other binder other than the fine binder fibers.
- Other binders include, for example, amorphous resins.
- the resin used as the other binder may be in the form of a water soluble or dispersible polymer added directly to the paper base dispersion of the sheet substrate, or it may be dried, or following further compression and / or heat treatment In the form of a powder of thermoplastic resin material mixed with aramid fibers so as to be activated as a binder by the heat applied between them.
- thermosetting resin such as polyamide resin, epoxy resin, phenol resin, urea resin, urethane resin, melamine formaldehyde resin, thermosetting polyester resin, alkyd resin, etc. Resin can be mentioned. Particularly useful are water soluble polyamide resins. Aqueous solutions or dispersions of thermoplastic resins such as poly (vinyl alcohol), polypropylene, polyester, poly (vinyl acetate) and the like can be used as well. In addition, these thermoplastic resins can be used also as a powder of said thermoplastic resin material.
- the said other binder may be contained in a sheet
- the blending amount of is smaller.
- the blending amount of the other binder can be, for example, 0.001 to 10% by weight, preferably 0.005 to 7% by weight, based on the total weight (total weight) of the insulating sheet. 3% by weight is more preferred, and 0.05 to 1% by weight is even more preferred.
- the insulating sheet of the present invention does not contain the other binder.
- the insulating sheet of the present invention may optionally contain other fibers made of materials other than aramid.
- other fibers include heat resistant fibers such as aromatic polyester fibers, aromatic polyether ketone fibers, and para-aramid fibers.
- the para-aramid fiber is obtained by condensation polymerization of a para-oriented aromatic diamine and a para-oriented aromatic dicarboxylic acid halide, and the amide bond is at the para position of the aromatic ring or an orientation position according thereto (for example, 4,4'- Substantially consisting of repeating units bonded at opposite orientations coaxially or in parallel, such as biphenylene, 1,5-naphthalene, 2,6-naphthalene, etc., for example, poly (p-phenylene terephthalamide) ), Poly (4,4'-benzanilide terephthalamide), poly (paraphenylene-4,4'-biphenylenedicarboxamide), poly (paraphenylene-2,6-naphthalenedicarboxamide), etc. Or the aromatic polyamide which has a structure close
- These aromatic polyamides are produced by polymerizing para-oriented aromatic diamines and para-oriented aromatic dicarboxylic acid hal
- the para-oriented aromatic diamine is exemplified by para-phenylene diamine (hereinafter sometimes referred to as PPD), 4,4'-diaminobiphenyl, 2-methyl-para-phenylene diamine, 2-chloro-para-phenylene diamine, 2,6 Mention may be made of -naphthalenediamine, 1,5-naphthalenediamine and 4,4'-diaminobenzanilide and the like.
- para-oriented aromatic dicarboxylic acid halide examples include terephthaloyl chloride (hereinafter sometimes referred to as TPC), 4,4'-benzoyl chloride, 2-chloroterephthaloyl chloride, 2,5-dichloroterephthaloyl Chloride, 2-methylterephthaloyl chloride, 2,6-naphthalenedicarboxylic acid chloride, 1,5-naphthalenedicarboxylic acid chloride and the like can be mentioned.
- TPC terephthaloyl chloride
- 4,4'-benzoyl chloride 2-chloroterephthaloyl chloride
- 2,5-dichloroterephthaloyl Chloride 2-methylterephthaloyl chloride
- 2,6-naphthalenedicarboxylic acid chloride 2,6-naphthalenedicarboxylic acid chloride
- 1,5-naphthalenedicarboxylic acid chloride and the like can be mentioned.
- the other fibers may be contained in the sheet substrate, and may be contained in the layer where the insulating sheet of the present invention comprises a layer consisting of fine binder fibers and a filler.
- the insulation sheet of this invention does not need to contain the said other fiber.
- the insulating sheet of the present invention can function as an electrical insulating sheet.
- the insulating sheet of the present invention can have an electrical resistance of at least 10 13 ⁇ cm, preferably at least 10 15 ⁇ cm, in accordance with the method of volume resistivity according to ASTM D-257.
- the insulating sheet of the present invention has excellent properties as an electrical insulating sheet, and in particular, has excellent electrical insulation and strength, and thus is useful as a component of an electrical insulator.
- the insulating sheet of the present invention or the laminate thereof can be used as a component of an electrical insulator that constitutes an electrical device such as a transformer, a generator, or a motor.
- the insulating sheet of the present invention or the laminate thereof may be impregnated with a resin such as phenol resin, epoxy, polyimide or the like, but can exhibit excellent electrical insulation without being impregnated with a resin.
- the present invention A sheet substrate comprising aramid floc having an average fiber width of 10 to 30 ⁇ m and aramid fibrid having an average fiber width of 5 to 40 ⁇ m, Fine binder fiber having an average fiber width of less than 5 ⁇ m present on at least the surface of the sheet substrate
- the above description applies to the aramid floc and the aramid fibrid.
- Examples 1 to 5 The aramid floc was subjected to disintegration treatment for 15 minutes at a bone dry weight concentration of 0.3% using a standard disintegration machine to obtain a fiber slurry having an average fiber width of 20 ⁇ m. Subsequently, the meta-aramid fibrid was subjected to disintegration treatment at a bone dry weight concentration of 1% using a standard disintegration machine for 15 minutes, and then refiner treatment to obtain a fiber slurry having an average fiber width of 6.5 to 18.5 ⁇ m.
- the resulting aramid floc and meta-aramid fibrids are mixed at 45: 65 or 50: 50 dry weight ratio, and a wet sheet is made with a square hand machine using a 120 mesh wire, and pressed with a press machine Dehydration and heat drying in a dryer were performed to obtain a sheet base of 42 g / m 2 .
- the meta-aramid fibrid is subjected to disintegration treatment at a bone dry weight concentration of 1% using a standard disintegration machine for 15 minutes, and then a high pressure homogenizer is used to obtain fine binder fibers having an average fiber width of 3 to 4.8 ⁇ m.
- the obtained fine binder fiber and a bismuth compound (Nacalai Tesque, bismuth hydroxide (III) hydroxide) are mixed at a solid content ratio of 1: 4, so that the solid content adhesion amount per side is 2.5 g / m 2
- the both sides of the sheet substrate were coated using a wire bar. This was heated and pressed with a metal roll heated to 300 ° C. to produce an insulating sheet.
- Example 6 Using hydrotalcite (trade name: Alkamizer, manufactured by Kyowa Chemical Industry Co., Ltd.) instead of a bismuth compound, the amount of solids content of fine binder fiber per one side is 1.0 g / m 2 , fine binder fiber and hydrotalcite Were mixed at a solid content ratio of 2:10, and coated on both sides of the sheet substrate using a wire bar so that the solid content adhesion amount per side was 6.0 g / m 2 An insulating sheet was produced in the same manner as 1).
- hydrotalcite trade name: Alkamizer, manufactured by Kyowa Chemical Industry Co., Ltd.
- Example 7 Adjust the refiner treatment and the homogenizer treatment so that the average fiber width of meta-aramid fibrids is 12.2 ⁇ m, and the average fiber width of fine binder fibers is 3.3 ⁇ m, and aramid floc and meta-aramid fibrids, bone dry weight ratio 50 It produced similarly to Example 6 except having mixed by the pair 50.
- Comparative Example 1 An insulating sheet was produced in the same manner as in Example 1 except that only a fine binder fiber was applied without using a bismuth compound.
- Comparative Example 2 An insulating sheet was produced in the same manner as in Example 1 except that the homogenizer treatment was adjusted so that the average fiber width of the fine binder fibers was 15 ⁇ m.
- the dielectric strength and the specific tensile strength were high, and the results of the heat deterioration test were good, and a good insulating sheet with no problem of the dropout of the filler was obtained.
- the sheet of Comparative Example 1 could not suppress the thermal deterioration because it did not use the filler.
- the sheet of Comparative Example 2 is inferior in dielectric strength and specific tear strength to the sheet of the example because the fiber width of the fine binder fiber is as large as 15 ⁇ m (much larger than 5 ⁇ m), and the dropout of the filler could not suppress.
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Abstract
Description
10~30μmの平均繊維幅を有するアラミドフロック及び5~40μmの平均繊維幅を有するアラミドフィブリッドからなるシート基材、
前記シート基材の少なくとも表面に存在する、5μm未満の平均繊維幅を有する微細バインダー繊維、並びに、
前記シート基材の少なくとも表面に存在する、少なくとも一種のフィラー
を含む絶縁シートに関する。
10~30μmの平均繊維幅を有するアラミドフロック及び5~40μmの平均繊維幅を有するアラミドフィブリッドからなるシート基材、
前記シート基材の少なくとも表面に存在する、5μm未満の平均繊維幅を有する微細バインダー繊維、並びに、
前記シート基材の少なくとも表面に存在する、少なくとも一種のフィラー
を含む絶縁シートが、高温条件下で金属と接触しても劣化を抑制することができ、フィラーの脱落が無く、且つ、優れた電気絶縁性及び優れた強度を有することを見出し、本発明を完成した。
本発明において「アラミド」とは芳香族ポリアミドを意味する。本発明において「芳香族ポリアミド」とは、化学構造的には、アミド結合の60モル%以上、好ましくは70モル%以上、より好ましくは80モル%以上、更により好ましくは90モル%以上が芳香環に直接結合した線状高分子化合物を意味する。
「アラミドフロック」とは、アラミドからなる短繊維である。本発明におけるアラミドフロックの(数)平均繊維長は、1~50mmの範囲が好ましく、2~40mmの範囲がより好ましく、3~30mmの範囲が更により好ましい。平均繊維長が1mmよりも小さいと絶縁シートの強度が低減するおそれがある。平均繊維長が50mmを超えると絶縁シートにおいてフロック同士の「絡み」、「結束」が発生しやすくなり、欠陥の原因となるおそれがあるため、好ましくない。
本発明の絶縁シートのシート基材はアラミドフィブリッドを含む。「アラミドフィブリッド」とは、アラミドからなるフィルム状又は繊維状の微小粒子であり、アラミドパルプと称されることもある(アラミドフィブリッドについては特公昭35-11851号、特公昭37-5752号等を参照)。フィブリッドは、通常の木材(セルロース)パルプと同じように抄紙性を有するため、水中分散後、抄紙機にてシート状に成形することができる。
本発明の絶縁紙のシート基材はアラミドフロック及びアラミドフィブリッドから主に構成される多孔性のシート状物であり、多数の空隙を有する。シート状物の形態は特に限定されるものではなく、織布、不織布、紙等の各種形態が挙げられるが、紙の形態であることが好ましい。
本発明の絶縁シートは、シート基材の少なくとも表面に存在する、5μm未満の平均繊維幅を有する微細バインダー繊維を含む。
本発明の絶縁シートは、シート基材の少なくとも表面に存在する少なくとも一種のフィラー(充填材)を含む。フィラーは粒子の形状を有する。
本発明の絶縁シートは、例えば、シート基材の片面又は両面を微細バインダー繊維及びフィラーで被覆することによって製造することができる。
本発明の絶縁シートは、必要に応じて、微細バインダー繊維以外の少なくとも1種のその他のバインダーを更に含むことができる。その他のバインダーとしては例えば不定型の樹脂が挙げられる。その他のバインダーとして使用される樹脂は、シート基材の製紙用分散体に直接添加される水溶性又は分散性ポリマーの形態でもよいし、あるいは乾燥、又は、次の更なる圧縮及び/又は加熱処理の間に加えられる熱によりバインダーとして活性化されるようにアラミド繊維と混ぜられた熱可塑性樹脂材料の粉体の形態でもよい。水溶性又は分散性ポリマーとしては、例えば、ポリアミド樹脂、エポキシ樹脂、フェノール樹脂、尿素樹脂、ウレタン樹脂、メラミンホルムアルデヒド樹脂、熱硬化性ポリエステル樹脂、アルキド樹脂等の水溶性又は水分散性の熱硬化性樹脂を挙げることができる。特に有用なのは水溶性ポリアミド樹脂である。ポリ(ビニルアルコール)、ポリプロピレン、ポリエステル、ポリ(酢酸ビニル)等の熱可塑性樹脂の水溶液又は水分散体も同様に使用することができる。なお、これらの熱可塑性樹脂は、上記の熱可塑性樹脂材料の粉体としても使用することができる。
本発明の絶縁シートは、必要に応じて、アラミド以外の材質からなる他の繊維を含んでもよい。他の繊維としては、例えば、芳香族ポリエステル繊維、芳香族ポリエーテルケトン繊維、パラアラミド繊維等の耐熱性繊維を挙げることができる。
10~30μmの平均繊維幅を有するアラミドフロック及び5~40μmの平均繊維幅を有するアラミドフィブリッドからなるシート基材、
前記シート基材の少なくとも表面に存在する、5μm未満の平均繊維幅を有する微細バインダー繊維
前記シート基材の少なくとも表面に存在する、少なくとも一種のフィラー
を含む絶縁シートを使用する電気絶縁方法、特に、電気絶縁性の改善方法、
或いは、
10~30μmの平均繊維幅を有するアラミドフロック及び5~40μmの平均繊維幅を有するアラミドフィブリッドからなるシート基材、
前記シート基材の少なくとも表面に存在する、5μm未満の平均繊維幅を有する微細バインダー繊維
前記シート基材の少なくとも表面に存在する、少なくとも一種のフィラー
を含む絶縁シートの電気絶縁のための使用、特に、電気絶縁性の改善のための使用、の側面を有する。上記アラミドフロック及び上記アラミドフィブリッドについては上記の説明が当てはまる。
(平均繊維幅)
下記実施例および比較例より得られた各繊維スラリーを希釈して、プレパラート上に均一な薄膜となるよう滴下して乾燥させ、走査型電子顕微鏡で100~400倍に拡大してランダムに3視野を観察し、各視野から無作為に30本の繊維幅を測定し、数平均繊維幅を算出した。
ASTM D-149に準拠して測定した。
JIS P8116:2000に準拠して測定した。
下記実施例および比較例より得られた絶縁シートを5cm×5cmに裁断したものを2枚用意し、その間に銅片を挟み、さらにシート全体をステンレス板で挟み、280℃のオーブンで120時間加熱した後、絶縁シートの状態を下記の判定基準にて目視評価した。
・ 銅片接触部とその周辺に穴が開いておらず、非接触部との変色の差が見られない。
・ 銅片接触部とその周辺に穴が開いていないが、非接触部との変色の差が見られる。
× 銅片と同等の大きさの穴が開いている。
下記実施例および比較例より得られた加熱加圧処理前の絶縁シートを23cm×23cmに断裁し、温度300℃、線圧60kg/cmの熱キャレンダーへ前記シートを10枚通過させた後、フィラーがロールへ転移することによる汚れの程度を下記の判定基準にて目視評価した。
・ ロールに汚れが見られる。
× ロールに汚れが見られない。
アラミドフロックを、標準離解機を用いて絶乾重量濃度0.3%で15分間離解処理し、平均繊維幅20μmの繊維スラリーを得た。次いで、メタアラミドフィブリッドを、標準離解機を用いて絶乾重量濃度1%で15分間離解処理した後、リファイナー処理により、平均繊維幅が6.5~18.5μmの繊維スラリーを得た。得られたアラミドフロックとメタアラミドフィブリッドを、絶乾重量比45:65または50:50で混合し、120メッシュワイヤーを用いた角型手抄きマシンでウェットシートを作成し、プレス機での脱水、乾燥機での加熱乾燥を行い、42g/m2のシート基材を得た。次に、メタアラミドフィブリッドを、標準離解機を用いて絶乾重量濃度1%で15分間離解処理した後、高圧ホモジナイザーを用いて、平均繊維幅が3~4.8μmの微細バインダー繊維を得た。得られた微細バインダー繊維と、ビスマス化合物(ナカライテスク製、水酸化ビスマス(III))を固形分比1:4で混合し、片面あたりの固形分付着量が2.5g/m2になるよう、ワイヤーバーを用いて前記シート基材の両面に塗付した。これを300℃に加熱した金属ロールにて加熱加圧処理し、絶縁シートを作製した。
ビスマス化合物の代わりにハイドロタルサイト(協和化学工業製、商品名:アルカマイザー)を用い、片面あたりの微細バインダー繊維の固形分付着量を1.0g/m2とし、微細バインダー繊維とハイドロタルサイトを固形分比2:10で混合し、片面あたりの固形分付着量が6.0g/m2になるよう、ワイヤーバーを用いて前記シート基材の両面に塗付したこと以外は、実施例1と同様に絶縁シートを作製した。
メタアラミドフィブリッドの平均繊維幅を12.2μm、微細バインダー繊維の平均繊維幅が3.3μmになるようリファイナー処理およびホモジナイザー処理を調節し、アラミドフロックとメタアラミドフィブリッドを、絶乾重量比50対50で混合した以外は、実施例6と同様に作製した。
ビスマス化合物を使用せず、微細バインダー繊維のみを塗付したこと以外は実施例1と同様に絶縁シートを作製した。
微細バインダー繊維の平均繊維幅が15μmになるようホモジナイザー処理を調節したこと以外は、実施例1と同様に絶縁シートを作製した。
Claims (15)
- 10~30μmの平均繊維幅を有するアラミドフロック及び5~40μmの平均繊維幅を有するアラミドフィブリッドからなるシート基材、
前記シート基材の少なくとも表面に存在する、5μm未満の平均繊維幅を有する微細バインダー繊維、並びに、
前記シート基材の少なくとも表面に存在する、少なくとも一種のフィラー
を含む絶縁シート。 - 絶縁耐力が15kV/mm以上であり、及び、比引裂強度が25mN・m2/g以上である、請求項1記載の絶縁シート。
- 前記微細バインダー繊維がホモジナイザー処理又はリファイナー処理を受けたものである、請求項1又は2記載の絶縁シート。
- 前記シート基材上に前記微細バインダー繊維及び前記フィラーからなる層を備える、請求項1~3のいずれかに記載の絶縁シート。
- 前記アラミドフロック、前記アラミドフィブリッド及び前記微細バインダー繊維の少なくとも1つがメタアラミドからなる、請求項1~4のいずれかに記載の絶縁シート。
- 前記シート基材中の前記アラミドフロックの量が前記シート基材の重量を基準として80~20重量%である、請求項1~5のいずれかに記載の絶縁シート。
- 前記シート基材中の前記アラミドフィブリッドの量が前記シート基材の重量を基準として20~80重量%である、請求項1~6のいずれかに記載の絶縁シート。
- 前記アラミドフロック対前記アラミドフィブリッドの重量比が20:80~80:20である、請求項1~7のいずれかに記載の絶縁シート。
- 前記フィラーが無機粒子である、請求項1~8のいずれかに記載の絶縁シート。
- 前記無機粒子がビスマス化合物を含む、請求項9記載の絶縁シート。
- 前記アラミドフロックの少なくとも一部及び前記アラミドフィブリッドの少なくとも一部が熱接着している、請求項1~10のいずれかに記載の絶縁シート。
- 20~1000g/m2の坪量を有する、請求項1~11のいずれかに記載の絶縁シート。
- 請求項1~12のいずれかに記載の絶縁シートを備える電気絶縁体。
- 請求項13記載の電気絶縁体を備える電気デバイス。
- 変圧器、発電機又は電動機である請求項14記載の電気デバイス。
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CN110373955A (zh) * | 2019-08-02 | 2019-10-25 | 吉林大学 | 聚醚醚酮纤维复合纸及其制备方法 |
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CN113463446A (zh) * | 2021-05-24 | 2021-10-01 | 广西大学 | 一种高导热复合纳米改性绝缘纸的制备方法 |
KR102656640B1 (ko) * | 2023-09-21 | 2024-04-12 | 주식회사 엔바이오니아 | 세라믹 페이퍼 및 그 제조방법 |
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JP2013019059A (ja) * | 2011-07-07 | 2013-01-31 | Sumitomo Bakelite Co Ltd | 繊維樹脂複合構造体、成形体の製造方法及び成形体 |
WO2016103966A1 (ja) * | 2014-12-26 | 2016-06-30 | 特種東海製紙株式会社 | 絶縁紙 |
US20170073896A1 (en) * | 2016-08-30 | 2017-03-16 | Yantai Metastar Special Paper Co., Ltd. | Method for producing meta-aramid fiber paper-based material |
JP2017527947A (ja) * | 2014-06-16 | 2017-09-21 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニーE.I.Du Pont De Nemours And Company | 限界酸素指数の大きい電気絶縁積層品 |
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US20130277089A1 (en) | 2011-01-04 | 2013-10-24 | Teijin Aramid B.V. | Electrical insulating paper |
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US3756908A (en) * | 1971-02-26 | 1973-09-04 | Du Pont | Synthetic paper structures of aromatic polyamides |
JPH0757579A (ja) * | 1993-08-18 | 1995-03-03 | New Oji Paper Co Ltd | 耐熱絶縁シートの製造方法 |
JPH07279089A (ja) * | 1994-04-01 | 1995-10-24 | Teijin Ltd | アラミド紙の製造方法 |
JP2013019059A (ja) * | 2011-07-07 | 2013-01-31 | Sumitomo Bakelite Co Ltd | 繊維樹脂複合構造体、成形体の製造方法及び成形体 |
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WO2016103966A1 (ja) * | 2014-12-26 | 2016-06-30 | 特種東海製紙株式会社 | 絶縁紙 |
US20170073896A1 (en) * | 2016-08-30 | 2017-03-16 | Yantai Metastar Special Paper Co., Ltd. | Method for producing meta-aramid fiber paper-based material |
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CN110373955A (zh) * | 2019-08-02 | 2019-10-25 | 吉林大学 | 聚醚醚酮纤维复合纸及其制备方法 |
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