CN114214864A - Method for preparing high-thermal-conductivity mica paper based on ice template method - Google Patents
Method for preparing high-thermal-conductivity mica paper based on ice template method Download PDFInfo
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- CN114214864A CN114214864A CN202111559280.6A CN202111559280A CN114214864A CN 114214864 A CN114214864 A CN 114214864A CN 202111559280 A CN202111559280 A CN 202111559280A CN 114214864 A CN114214864 A CN 114214864A
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- mica paper
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- mica
- thermal conductivity
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- 239000010445 mica Substances 0.000 title claims abstract description 64
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000945 filler Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000004108 freeze drying Methods 0.000 claims abstract description 9
- 238000007710 freezing Methods 0.000 claims abstract description 8
- 230000008014 freezing Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 4
- 229920001131 Pulp (paper) Polymers 0.000 claims description 4
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 4
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 claims description 4
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 4
- 238000011282 treatment Methods 0.000 claims description 4
- 229910052582 BN Inorganic materials 0.000 claims description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 210000000481 breast Anatomy 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 229920000609 methyl cellulose Polymers 0.000 claims description 2
- 239000001923 methylcellulose Substances 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims 2
- 239000011231 conductive filler Substances 0.000 claims 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims 1
- 235000010981 methylcellulose Nutrition 0.000 claims 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims 1
- 229940069328 povidone Drugs 0.000 claims 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 238000003490 calendering Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920003123 carboxymethyl cellulose sodium Polymers 0.000 description 1
- 229940063834 carboxymethylcellulose sodium Drugs 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
-
- 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
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
- D21H13/44—Flakes, e.g. mica, vermiculite
-
- 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/07—Nitrogen-containing 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
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
- D21H17/26—Ethers thereof
-
- 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
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/35—Polyalkenes, e.g. polystyrene
-
- 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
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- 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
- D21H17/53—Polyethers; Polyesters
-
- 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
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
-
- 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
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
- Insulating Bodies (AREA)
Abstract
The invention discloses a preparation method of high-thermal-conductivity mica paper, which comprises the following steps: 1) uniformly stirring the heat-conducting filler, the adhesive and the dispersing agent, further mixing the mixture with mica powder and water, and placing the prepared slurry with proper concentration into a head box; 2) spraying the slurry on the net, and quickly freezing the upper net paper material on a forming plate in a one-way manner; 3) and (3) freeze-drying, squeezing and compacting the frozen paper material, and finally performing calendaring modification to obtain the high-thermal-conductivity mica paper. The mica paper prepared by the method has higher longitudinal thermal conductivity and better air permeability and insulating property under the condition of lower filler content.
Description
Technical Field
The invention relates to the technical field of production and manufacture of main insulation high-thermal conductivity mica paper of medium and large motors, and particularly relates to a method for manufacturing high-thermal conductivity mica paper.
Technical Field
The mica paper is a paper-like non-metal insulating material which is prepared by combining broken mica as a raw material under the combined action of Van der Waals force and electrostatic attraction between mica scales, and maintains the performances of high temperature resistance, high voltage resistance, insulation resistance, corona resistance and the like of natural mica. Mica paper is widely applied to the production of high-voltage motors in the electrical industry. In order to adapt to the continuous development of industrial electricity and the continuous improvement of the requirement on the insulating property of the motor, the development of the mica insulating material with high heat conductivity has very important significance. However, the existing mica paper has the problems of poor air permeability, poor electrical insulation performance and the like after being added with the heat-conducting filler, so that the mica paper has poor heat dissipation performance in the operation process after being applied to a high-voltage motor, and the insulation electrical performance, mechanical performance and service life are reduced. Therefore, how to improve the pressure resistance and the thermal conductivity of the mica paper insulating material is an urgent problem to be considered and solved.
Disclosure of Invention
The invention provides a preparation method of a high-thermal-conductivity mica paper material for a high-voltage motor, aiming at solving the defect that the existing motor main insulation mica paper has low insulation level and poor thermal conductivity. The filler forms a rapid heat conduction channel in the mica paper in the direction perpendicular to the paper surface by the ice template technology, and meanwhile, the mica paper has good air permeability due to a porous structure generated by moisture volatilization in the drying process. The finally prepared mica paper material with high heat conductivity has good heat dissipation performance and heat conductivity.
The invention is realized by the following technical scheme: a method for preparing oriented high-thermal-conductivity mica paper by a freeze casting technology comprises the following steps:
(1) weighing a certain mass proportion of the heat-conducting filler, the binder and the dispersant, mixing and stirring uniformly.
(2) And (2) adding a proper amount of mica powder and the solution obtained in the step (1) into a certain mass of water, and stirring until the slurry is uniform.
(3) And (3) feeding the slurry obtained in the step (2) into a slurry tank, and spraying the slurry onto the wire near the center line of the breast roll at a spraying speed close to the wire speed. After the paper material is conveyed to the upper part of the forming plate filled with liquid nitrogen, the water in the slurry is quickly crystallized in the direction vertical to the forming plate, the mica powder, the filler and the binder are intensively extruded among the ice crystals, and the mica paper pulp realizes the directional freezing.
(4) And (4) conveying the frozen paper stock formed in the step (3) to a freeze drying device through a paper guide roller for freeze drying to enable the water content of the mica paper to be lower than 5%, and further conveying the mica paper to a pressing part for multiple pressing treatments to reduce the thickness of the mica paper and increase the density and contact area of the filler. And then drying, cooling in a cold cylinder and coiling to obtain the required mica paper with high thermal conductivity.
The binder is one or more of polyvidone, polyethylene glycol, methylcellulose, carboxymethylcellulose sodium or polyvinyl alcohol.
The heat conducting filler is one or more of boron nitride, silicon nitride, aluminum nitride, magnesium oxide, silicon oxide or aluminum oxide.
The dispersing agent is one or more of methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, acetic acid, acetone or toluene.
The mass ratio of the filler solution raw materials is as follows: heat-conducting filler: dispersant 1: 1-2: 1 to 10.
The mass ratio of the heat-conducting filler to the mica powder in the mica paper pulp is 1: 2-19, and adding water to adjust the solid content to 20% -30%.
The forming plate is a copper plate, and the purpose of quickly freezing the slurry above the copper plate is achieved by continuously injecting liquid nitrogen into the copper plate.
In the freeze drying device, the vacuum degree in a drying chamber is 10Pa, and the freezing temperature is-50 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the mica paper prepared by the invention has the advantages that the heat conductivity is multiplied in the direction vertical to the paper surface due to the directional arrangement of the heat-conducting fillers, the paper has good air permeability due to more gaps formed by water volatilization in the drying process, and the impregnated mica paper has higher heat conductivity coefficient and breakdown field intensity.
Drawings
FIG. 1 preparation process of high thermal conductivity mica paper
Detailed Description
The technical solutions of the present invention are further described below with reference to the specific embodiments, but the present invention is not limited thereto, and any modifications or equivalent substitutions made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention should be covered by the protection scope of the present invention.
The embodiment provides a method for preparing high-thermal-conductivity mica paper by an ice template method, as shown in fig. 1, the specific implementation steps are as follows:
(1) 1kg of polyvinyl alcohol and 2kg of boron nitride powder were weighed into 7kg of acetone, and the mixed filler solution was stirred at 1000 revolutions using a disperser.
(2) Weighing 7kg of mica powder, adding the mica powder and the uniformly mixed filler solution into 1000kg of water, and fully stirring to prepare mica slurry with the concentration of 1%.
(3) Liquid nitrogen was continuously injected into the copper plate to maintain it in a low temperature state.
(4) The uniformly stirred slurry is fed into a slurry tank and sprayed onto the wire near the center line of the breast roll at a spraying speed close to the wire speed. After the paper material is conveyed to the upper part of the forming plate filled with liquid nitrogen, the water in the slurry is quickly crystallized in the direction vertical to the forming plate, the mica powder, the filler and the binder are intensively extruded among the ice crystals, and the mica paper pulp realizes the directional freezing.
(5) The frozen paper stock is conveyed to a freeze drying device through a paper guide roller for freeze-drying treatment, so that the water content of the mica paper is below 5 percent, and then the mica paper is conveyed to a pressing part for multiple pressing treatments to reduce the thickness of the mica paper and increase the density of the filler and the contact area. And then drying, cooling in a cold cylinder and coiling to obtain the required mica paper with high thermal conductivity.
In conclusion, compared with the existing products, the high-thermal-conductivity mica paper prepared by the invention has the advantages of simple preparation method, less filler consumption, good air permeability and lower cost, and the oriented high-speed thermal conduction channel is formed in the direction vertical to the surface of the mica paper, so that the thermal conductivity of the mica paper is improved exponentially.
Claims (8)
1. The preparation method of the mica paper with high thermal conductivity is characterized by comprising the following steps:
(1) weighing a certain mass proportion of heat-conducting filler, a binder and a dispersant, mixing and uniformly stirring;
(2) adding a proper amount of mica powder and the filler solution obtained in the step (1) into water with a certain mass, and stirring until the slurry is uniform;
(3) feeding the slurry obtained in the step (2) into a slurry tank, spraying the slurry onto a net near the center line of a breast roll at a spraying speed close to the net speed, conveying the web-fed paper material above a forming plate filled with liquid nitrogen, rapidly crystallizing the moisture in the slurry in a direction vertical to the forming plate, intensively extruding the mica powder, the filler and the binder among ice crystals, and realizing directional freezing of the mica paper pulp;
(4) and (4) conveying the frozen paper material formed in the step (3) to a freeze drying device through a paper guide roller for freeze drying to enable the water content of the mica paper to be lower than 5%, further conveying the mica paper to a squeezing part for multiple times of squeezing treatment to reduce the thickness of the mica paper and increase the density and contact area of the filler, and then drying, cooling in a cooling cylinder and coiling to obtain the required high-heat-conductivity mica paper.
2. The method for preparing mica paper with high thermal conductivity according to claim 1, wherein the binder in step (1) is one or more of povidone, polyethylene glycol, methylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, or polyvinyl alcohol.
3. The method for preparing mica paper with high thermal conductivity according to claim 1, wherein the thermal conductive filler in step (1) is one or more of boron nitride, silicon nitride, aluminum nitride, magnesium oxide, silicon oxide or aluminum oxide.
4. The method for preparing mica paper with high thermal conductivity according to claim 1, wherein the dispersant in step (1) is one or more of methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, acetic acid, acetone or toluene.
5. The method for preparing mica paper with high thermal conductivity according to claim 1, wherein the mass ratio of the raw materials in the step (1) is binder: heat-conducting filler: dispersant 1: 1-2: 1 to 10.
6. The method for preparing mica paper with high thermal conductivity according to claim 1, wherein the mass ratio of the thermal conductive filler to the mica powder in the step (2) is 1: 2-19, and adding water to adjust the solid content to 20% -30%.
7. The method for preparing mica paper with high thermal conductivity according to claim 1, wherein the forming plate in step (3) is a copper plate, and the purpose of rapidly freezing the slurry above the copper plate is achieved by continuously injecting liquid nitrogen into the copper plate.
8. The method for preparing mica paper with high thermal conductivity according to claim 1, wherein in the freeze-drying device in the step (4), the vacuum degree in the drying chamber is 10Pa, and the freezing temperature is-50 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111559280.6A CN114214864B (en) | 2021-12-20 | 2021-12-20 | Method for preparing high-thermal-conductivity mica paper based on ice template method |
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| CN202111559280.6A CN114214864B (en) | 2021-12-20 | 2021-12-20 | Method for preparing high-thermal-conductivity mica paper based on ice template method |
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| CN114214864A true CN114214864A (en) | 2022-03-22 |
| CN114214864B CN114214864B (en) | 2023-01-20 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050274774A1 (en) * | 2004-06-15 | 2005-12-15 | Smith James D | Insulation paper with high thermal conductivity materials |
| JP2012140509A (en) * | 2010-12-28 | 2012-07-26 | Jsr Corp | Foam-molded article, heat-conductive molded article and method of producing the same, and heat-conductive sheet laminate |
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| JP2012140509A (en) * | 2010-12-28 | 2012-07-26 | Jsr Corp | Foam-molded article, heat-conductive molded article and method of producing the same, and heat-conductive sheet laminate |
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