CN115595819A - Heat-conducting insulating paper and preparation method thereof - Google Patents
Heat-conducting insulating paper and preparation method thereof Download PDFInfo
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- CN115595819A CN115595819A CN202211329652.0A CN202211329652A CN115595819A CN 115595819 A CN115595819 A CN 115595819A CN 202211329652 A CN202211329652 A CN 202211329652A CN 115595819 A CN115595819 A CN 115595819A
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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
- 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
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- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
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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
- D21H17/20—Macromolecular organic compounds
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- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
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- 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
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- 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
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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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
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- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/46—Non-macromolecular organic compounds
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- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
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- 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
- D21H21/06—Paper forming aids
- D21H21/08—Dispersing agents for fibres
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- 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
- D21H21/06—Paper forming aids
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- 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
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- 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
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Abstract
The invention provides heat-conducting insulating paper and a preparation method thereof, wherein the method comprises the following steps: dissolving aramid fiber in dimethyl sulfoxide, and mixing with a dimethyl sulfoxide dispersion liquid of boron nitride to prepare a coating liquid; preparing boron nitride-filled aramid paper by wet forming; and (3) carrying out processes of coating, multilayer compounding, hot pressing and the like on the prepared aramid paper to obtain the heat-conducting insulating paper. The invention effectively improves the content of boron nitride in paper by combining two means of filling and coating, and the heat conduction insulating paper prepared by the method of the invention improves the heat conduction coefficient of the material by 4 times while ensuring the insulating property.
Description
Technical Field
The invention belongs to the technical field of paper industry and material industry, and particularly relates to heat-conducting insulating paper and a preparation method thereof.
Background
Paper has been used for many years in the insulation field as a lightweight, laminar material. The commonly used insulation paper is made of plant fiber as a raw material by wet forming. With the development and localization of high-performance fibers, high-performance paper-based composite materials with synthetic fibers as raw materials and mica as filler become the mainstream of insulating paper, and are widely applied to machinery and equipment such as motors, cables, capacitors, transformers and the like. The electrical equipment can generate a large amount of heat during working, the high-performance fibers and the mica are poor thermal conductors, the heat generated during working of the electrical equipment is not easy to be emitted, local high temperature is generated to influence the working efficiency of the machine, and the service life of the machine is shortened. Now thatSome insulating paper is formed by compounding high-performance fibers and vowels, only has an insulating function and lacks a heat conduction function, so that the problems of local high temperature and the like need to be solved urgently 。
Disclosure of Invention
In order to overcome the above drawbacks of the prior art, an object of the present invention is to provide a heat conductive insulating paper and a method for making the same, which are used to simultaneously achieve the dual functions of insulation and heat conduction of paper materials.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a preparation method of heat-conducting insulating paper, which comprises the following steps:
s1: mixing the aramid chopped fibers, boron nitride and a dispersing agent, then carrying out defibering, and adding aramid fibrids for carrying out secondary defibering; adding a retention aid, stirring to obtain a mixture, pouring the mixture into a forming die, and dehydrating to obtain a wet paper sheet; carrying out flat plate cold pressing and drying treatment on the wet paper to obtain aramid paper;
s2: mixing boron nitride and dimethyl sulfoxide to obtain a dispersion liquid; mixing the aramid nano-fiber solution with the dispersion liquid to obtain a coating liquid;
s3: coating the coating liquid on two surfaces of the aramid paper to obtain the aramid paper coated with the coating liquid; laminating a plurality of pieces of aramid paper coated with the coating liquid to obtain composite paper;
s4: and carrying out proton exchange treatment, drying treatment and hot pressing treatment on the composite paper to obtain the heat-conducting insulating paper.
Furthermore, the quantitative amount of the aramid paper obtained in S1 is 20-30g/m 2 。
Further, in S1, the addition amount of boron nitride is 10% -50% of the basis weight of the paper, and the mass ratio of the aramid chopped fiber to the aramid fibrid is 3.
In S1, the dispersing agent is polyoxyethylene, the addition amount of the polyoxyethylene is 0.12% of the mass of the aramid chopped fiber, and the polyoxyethylene is prepared into a 0.05wt.% polyoxyethylene aqueous solution before use.
In S1, the retention aid is polyacrylamide, the addition amount of the polyacrylamide is 0.02% of the fixed amount of the aramid paper, and the polyacrylamide is prepared into a 0.02wt.% polyacrylamide aqueous solution before use.
Further, in S1, the drying temperature is 105 ℃, and the drying time is 8-10 min.
In S2, the dispersion concentration of boron nitride in the dispersion liquid is 0.1-2%, the concentration of the aramid nanofiber dispersion liquid is 0.1-2%, and the mixing mass ratio of the aramid nanofiber solution to the dispersion liquid is 1.
Further, in S3, 2 to 3 sheets of the aramid paper coated with the coating liquid are laminated to obtain composite paper.
Further, in S4, the proton exchange treatment is performed in a water bath, and the time of the proton exchange treatment is 24 hours.
Further, in S4, the temperature of the hot pressing treatment is 200 ℃, the pressure is 10MPa, and the time of the hot pressing treatment is 5 min-10 min.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a preparation method of heat-conducting insulating paper, which comprises the steps of obtaining aramid paper by a wet papermaking technology, obtaining the aramid paper with heat conducting performance and insulating performance by wet forming, coating a coating liquid on two surfaces of the aramid paper by a paper coating process, and compounding into a plurality of layers by a coating mode, so that the heat conducting performance and the insulating performance of the paper are further enhanced.
The invention also discloses the heat-conducting insulating paper prepared by the preparation method, and according to the relevant experimental results, when the addition amount of boron nitride is 30wt.%, the heat conductivity coefficient of the insulating heat-conducting paper is improved by 4 times compared with that of the aramid mica paper with the same quality; the dielectric strength is equivalent to that of the commercially available aramid mica paper with the same quantitative.
Drawings
Fig. 1 is a real image of the heat-conductive insulating paper of the present invention.
FIG. 2 is a flow chart of the preparation of the heat conductive and insulating paper of the present invention;
fig. 3 is a schematic structural diagram of the heat-conducting insulating paper of the present invention.
Detailed Description
To make the features and effects of the present invention comprehensible to those skilled in the art, general description and definitions are made below with reference to terms and expressions mentioned in the specification and claims. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The theory or mechanism described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, i.e., the present disclosure may be practiced without being limited by any particular theory or mechanism.
All features defined herein as numerical ranges or percentage ranges, such as values, amounts, levels and concentrations, are for brevity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to cover and specifically disclose all possible subranges and individual numerical values (including integers and fractions) within the range.
In this document, unless otherwise specified, "comprising," "including," "having," or similar terms, shall mean "consisting of 8230; \8230, composition" and "consisting essentially of 8230; \8230, composition" such as "A comprises a" shall mean "A comprises a and the other" and "A comprises a only".
In this context, for the sake of brevity, not all possible combinations of features in the various embodiments or examples are described. Therefore, the respective features in the respective embodiments or examples may be arbitrarily combined as long as there is no contradiction between the combinations of the features, and all the possible combinations should be considered as the scope of the present specification.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The following examples use instrumentation conventional in the art. Experimental procedures without specific conditions noted in the following examples, generally according to conventional conditions, or according to conditions recommended by the manufacturer. The various starting materials used in the examples which follow, unless otherwise indicated, are conventional commercial products having specifications which are conventional in the art. In the description of the present invention and the following examples, "%" represents weight percent, "parts" represents parts by weight, and proportions represent weight ratios, unless otherwise specified.
The following examples are all exemplified by laboratory handsheets, which are circles of 200mm diameter and have an area of 0.0314m 2 . Examples the formulations are shown in table 1:
TABLE 1 formulation data for various examples
Example 1
A preparation method of heat-conducting insulating paper comprises the following steps:
s1: the papermaking quantitative rate is 20g/m 2 And an aramid paper containing 10% of BN added. Mixing 0.1696g of aramid chopped fiber, 0.0628g of Boron Nitride (BN) and 0.407mL of polyethylene oxide (PEO) in water, then defibering by a defibering machine, and then adding 0.3956g of aramid fibrid for secondary defibering; then adding 0.628mL of Polyacrylamide (PAM), stirring to obtain a mixture, pouring the mixture into a paper former with the inner diameter of 200mm, and dehydrating to obtain a wet paper sheet; the wet paper was cold-pressed on a plate for 4min and then transferred to a sheet dryer for 8min at 105 ℃ to give a basis weight of 20g/m 2 The aramid paper of (a);
s2: 0.5g of BN was dispersed in 499.5g of dimethyl sulfoxide (DMSO) to obtain a 0.1% BN dispersion; accurately weighing 0.5g of aramid chopped fiber, 0.75g of KOH and 20g of distilled water, and stirring together with 478.75g of DMSO until the solution is uniformly dark red, thereby obtaining an ANF solution with the mass concentration of 0.1%; mixing the obtained BN dispersion solution of the ANF solution to obtain a coating liquid;
s3, coating the coating liquid on two surfaces of the aramid paper to obtain the aramid paper coated with the coating liquid; laminating 3 pieces of aramid paper coated with the coating liquid to obtain composite paper;
s4: and transferring the obtained composite paper into a water bath to be soaked for 24h, then drying for 5min at 105 ℃ by using a paper dryer, and then carrying out hot pressing for 5min at 200 ℃ under the pressure of 10MPa to obtain the heat-conducting insulating paper.
Example 2
A preparation method of heat-conducting insulating paper comprises the following steps:
s1: the papermaking basis weight is 20g/m 2 And aramid paper with 30% of BN addition amount. Mixing 0.1319g of aramid chopped fiber, 0.1884g of Boron Nitride (BN) and 0.317mL of polyethylene oxide (PEO) in water, then defibering by a defibering machine, and then adding 0.3077g of aramid fibrid for secondary defibering; then adding 0.628mL of Polyacrylamide (PAM), stirring to obtain a mixed solution, pouring the mixed solution into a paper sheet former with the inner diameter of 200mm, and dehydrating to obtain a wet paper sheet; the wet sheet was cold-pressed for 4min on a plate and subsequently transferred to a sheet dryer and dried at 105 ℃ for 8min to give a basis weight of 20g/m 2 The aramid paper of (a);
s2: BN (2.5 g) was dispersed in dimethyl sulfoxide (DMSO) (497.5 g) to obtain a 0.5% BN dispersion; accurately weighing 2.5g of aramid chopped fiber, 3.75g of KOH and 20g of distilled water, and stirring together with 473.75g of DMSO until the solution is uniformly dark red, thereby obtaining an ANF solution with the mass concentration of 0.5%; mixing the obtained BN dispersion liquid of the ANF solution to obtain a coating liquid;
s3, coating the coating liquid on two surfaces of the aramid paper to obtain the aramid paper coated with the coating liquid; laminating 3 pieces of aramid paper coated with the coating liquid to obtain composite paper;
s4: and transferring the obtained composite paper into a water bath to be soaked for 24h, then drying for 5min at 105 ℃ by using a paper dryer, and then carrying out hot pressing for 10min at 200 ℃ under the pressure of 10MPa to obtain the heat-conducting insulating paper.
Example 3
A preparation method of heat-conducting insulating paper comprises the following steps:
s1: the papermaking basis weight is 20g/m 2 And aramid paper with 50% of BN addition amount. Mixing 0.0942g of aramid chopped fiber, 0.3140g of Boron Nitride (BN) and 0.226mL of polyethylene oxide (PEO) in water, then fluffing by a fluffer, adding 0.2198g of aramid fibrid, and carrying out secondary fluffing; then adding 0.628mL of Polyacrylamide (PAM), stirring to obtain a mixed solution, pouring the mixed solution into a paper sheet former with the inner diameter of 200mm, and dehydrating to obtain a wet paper sheet; the wet paper sheet was subjected to plate cold pressing for 4min, and then transferred to a sheet dryer, and dried at 105 ℃ for 8min to give a quantitative 20g/m 2 The aramid paper of (a);
s2: BN was dispersed in an amount of 5.0g in 495.0g of dimethyl sulfoxide (DMSO) to obtain a 1% BN dispersion; accurately weighing 5.0g of aramid chopped fibers, 7.5g of KOH and 20g of distilled water, and stirring together with 467.5g of DMSO until the solution is uniformly dark red, thereby obtaining an ANF solution with the mass concentration of 1%; mixing the obtained ANF solution and the BN dispersion liquid to obtain a coating liquid;
s3, coating the coating liquid on two surfaces of the aramid paper to obtain the aramid paper coated with the coating liquid; laminating 3 pieces of aramid paper coated with the coating liquid to obtain composite paper;
s4: and transferring the obtained composite paper into a water bath for soaking for 24h, then drying for 5min at 105 ℃ by using a paper dryer, and then carrying out hot pressing for 5min at 200 ℃ under the pressure of 10MPa to obtain the heat-conducting insulating paper.
Example 4
A preparation method of heat-conducting insulating paper comprises the following steps:
s1: the papermaking quantitative was 30g/m 2 And 20% of BN addition amount. Mixing 0.2261g of aramid chopped fiber, 0.1884g of Boron Nitride (BN) and 0.543mL of polyethylene oxide (PEO) in water, then defibering by a defibering machine, and then adding 0.5275g of aramid fibrid for secondary defibering; then adding 0.942mL of Polyacrylamide (PAM), stirring to obtain a mixed solution, pouring the mixed solution into a paper sheet former, and dehydrating to obtain a wet paper sheet; plate-cold pressing the wet paper sheet for 4min, and thenTransferring to a sheet former with an inner diameter of 200mm, and drying at 105 deg.C for 8min to obtain a basis weight of 30g/m 2 The aramid paper of (a);
s2: 7.5g of BN was dispersed in 492.5g of dimethyl sulfoxide (DMSO) to obtain a 1.5% BN dispersion; accurately weighing 7.5g of aramid chopped fiber, 11.25g of KOH and 20g of distilled water, and stirring together with 461.25g of DMSO until the solution is uniformly dark red, thereby obtaining an ANF solution with the mass concentration of 1.5%; mixing the obtained ANF solution and the BN dispersion liquid to obtain a coating liquid;
s3, coating the coating liquid on two surfaces of the aramid paper to obtain the aramid paper coated with the coating liquid; attaching 2 pieces of aramid paper coated with the coating liquid to obtain composite paper;
s4: and transferring the obtained composite paper into a water bath to be soaked for 24h, then drying for 5min at 105 ℃ by using a paper dryer, and then carrying out hot pressing for 5min at 200 ℃ under the pressure of 10MPa to obtain the heat-conducting insulating paper.
Example 5
A preparation method of heat-conducting insulating paper comprises the following steps:
s1: the papermaking basis weight was 30g/m 2 And aramid paper with a BN addition of 40%. Mixing 0.1696g of aramid chopped fiber, 0.3768g of Boron Nitride (BN) and 0.407mL of polyethylene oxide (PEO) in water, then defibering by a defibering machine, and then adding 0.3956g of aramid fibrid for secondary defibering; then adding 0.942mL of Polyacrylamide (PAM), stirring to obtain a mixed solution, pouring the mixed solution into a paper sheet former with the inner diameter of 200mm, and dehydrating to obtain a wet paper sheet; the wet paper sheet was subjected to plate cold pressing for 4min, and then transferred to a sheet dryer, and dried at 105 ℃ for 8min to give a quantitative 30g/m 2 The aramid paper of (a);
s2: 10.0g of BN was dispersed in 490.0g of dimethyl sulfoxide (DMSO) to obtain a 2% BN dispersion; accurately weighing 10.0g of aramid chopped fiber, 15.0g of KOH and 20g of distilled water, and stirring together with 455.0g of DMSO until the solution is uniformly dark red, thereby obtaining an ANF solution with the mass concentration of 2%; mixing the obtained ANF solution and the BN dispersion liquid to obtain a coating liquid;
s3, coating the coating liquid on two surfaces of the aramid paper to obtain the aramid paper coated with the coating liquid; attaching 2 pieces of aramid paper coated with the coating liquid to obtain composite paper;
s4: and transferring the obtained composite paper into a water bath for soaking for 24 hours, drying for 5 minutes at 105 ℃ by using a paper dryer, and then hot-pressing for 5 minutes at 200 ℃ under the pressure of 10MPa to obtain the heat-conducting insulating paper.
Fig. 1 is a diagram showing an actual view of a heat-conducting insulating paper, an embedded diagram is a diagram showing a bent actual view, and it can be seen from the diagram that the coated and compounded aramid paper layers are well combined and do not fall off or slide between layers when being bent.
Fig. 2 is a flow chart of a process for preparing the heat-conducting insulating paper. Fig. 3 is a schematic structural diagram of a thermal conductive insulating paper prepared according to the present invention, and a coating liquid is applied to two surfaces of an aramid paper to obtain an aramid paper coated with the coating liquid; and (3) attaching 2 or 3 layers of aramid paper coated with the coating liquid to obtain composite paper, and performing proton exchange treatment, drying treatment and hot pressing treatment on the composite paper to obtain the heat-conducting insulating paper.
The above contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention should not be limited thereby, and any modification made on the basis of the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The preparation method of the heat-conducting insulating paper is characterized by comprising the following steps of:
s1: mixing the aramid chopped fibers, boron nitride and a dispersing agent, then carrying out defibering, and adding aramid fibrids for carrying out secondary defibering; adding a retention aid, stirring to obtain a mixture, pouring the mixture into a forming die, and dehydrating to obtain a wet paper sheet; carrying out plate cold pressing and drying treatment on the wet paper to obtain aramid paper;
s2: mixing boron nitride and dimethyl sulfoxide to obtain a dispersion liquid; mixing the aramid nano-fiber solution with the dispersion liquid to obtain a coating liquid;
s3: coating the coating liquid on two surfaces of the aramid paper to obtain the aramid paper coated with the coating liquid; laminating a plurality of pieces of aramid paper coated with coating liquid to obtain composite paper;
s4: and carrying out proton exchange treatment, drying treatment and hot pressing treatment on the composite paper to obtain the heat-conducting insulating paper.
2. The preparation method of the heat-conducting insulating paper as claimed in claim 1, wherein the quantitative amount of the aramid paper obtained in S1 is 20-30g/m 2 。
3. The preparation method of the heat-conducting insulating paper as claimed in claim 1, wherein in S1, the addition amount of the boron nitride is 10% -50% of the basis weight of the paper, and the mass ratio of the aramid chopped fiber to the aramid fibrid is 3.
4. The method for preparing the heat-conducting insulating paper as claimed in claim 1, wherein in S1, the dispersant is polyethylene oxide, the addition amount of the polyethylene oxide is 0.12% of the mass of the aramid chopped fibers, and the polyethylene oxide is prepared into a 0.05wt.% polyethylene oxide aqueous solution before use.
5. The method for preparing heat-conducting insulating paper according to claim 1, wherein in S1, the retention aid is polyacrylamide, the addition amount of the polyacrylamide is 0.02% of the basis weight of the aramid paper, and the polyacrylamide is prepared into a 0.02wt.% polyacrylamide aqueous solution before use.
6. The method for preparing the heat-conducting insulating paper as claimed in claim 1, wherein in S1, the drying temperature is 105 ℃ and the drying time is 8-10 min.
7. The preparation method of the heat-conducting insulating paper as claimed in claim 1, wherein in S2, the dispersion concentration of boron nitride in the dispersion liquid is 0.1-2%, the concentration of the aramid nanofiber dispersion liquid is 0.1-2%, and the mixing mass ratio of the aramid nanofiber solution to the dispersion liquid is 1.
8. The method for preparing heat-conducting insulating paper according to claim 1, wherein 2 to 3 pieces of aramid paper coated with the coating liquid are laminated in S3 to obtain composite paper.
9. The method for preparing the heat-conducting insulating paper as claimed in claim 1, wherein in S4, the proton exchange treatment is carried out in a water bath, and the time of the proton exchange treatment is 12-24 h.
10. The method for preparing the heat-conducting insulating paper as claimed in claim 1, wherein in S4, the temperature of the hot pressing treatment is 200 ℃, the pressure is 10MPa, and the time of the hot pressing treatment is 5min to 10min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116289296A (en) * | 2023-03-29 | 2023-06-23 | 华南理工大学 | Heat-conducting and insulating industrial aramid paper and preparation method thereof |
| CN116497625A (en) * | 2023-05-04 | 2023-07-28 | 山东仁丰特种材料股份有限公司 | Composite aramid paper and preparation method thereof |
| CN117304535A (en) * | 2023-11-01 | 2023-12-29 | 陕西科技大学 | Boron nitride nanosheet/aramid nanofiber composite film ball-milled by hydroxyethyl cellulose and preparation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10130496A (en) * | 1996-10-31 | 1998-05-19 | Du Pont Teijin Advanced Paper Kk | Aramid complex sheet, preparation thereof and electric and electronic equipment and appliances having the same |
| CN107541985A (en) * | 2017-08-10 | 2018-01-05 | 华南理工大学 | A kind of high heat conductive insulating aramid fiber prepreg and its manufacture method |
| CN109721750A (en) * | 2018-12-14 | 2019-05-07 | 华南理工大学 | A kind of low-dielectric constant nano aramid fiber/boron nitride thermally conductive film and preparation method thereof |
| CN111235944A (en) * | 2020-02-17 | 2020-06-05 | 陕西科技大学 | Aramid nanofiber coated aramid paper and preparation method thereof |
| CN112746522A (en) * | 2020-03-25 | 2021-05-04 | 株洲时代新材料科技股份有限公司 | High-dielectric-property composite aramid paper |
| CN113005820A (en) * | 2021-02-25 | 2021-06-22 | 陕西科技大学 | Preparation method of multilayer composite aramid paper |
-
2022
- 2022-10-27 CN CN202211329652.0A patent/CN115595819A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10130496A (en) * | 1996-10-31 | 1998-05-19 | Du Pont Teijin Advanced Paper Kk | Aramid complex sheet, preparation thereof and electric and electronic equipment and appliances having the same |
| CN107541985A (en) * | 2017-08-10 | 2018-01-05 | 华南理工大学 | A kind of high heat conductive insulating aramid fiber prepreg and its manufacture method |
| CN109721750A (en) * | 2018-12-14 | 2019-05-07 | 华南理工大学 | A kind of low-dielectric constant nano aramid fiber/boron nitride thermally conductive film and preparation method thereof |
| CN111235944A (en) * | 2020-02-17 | 2020-06-05 | 陕西科技大学 | Aramid nanofiber coated aramid paper and preparation method thereof |
| CN112746522A (en) * | 2020-03-25 | 2021-05-04 | 株洲时代新材料科技股份有限公司 | High-dielectric-property composite aramid paper |
| CN113005820A (en) * | 2021-02-25 | 2021-06-22 | 陕西科技大学 | Preparation method of multilayer composite aramid paper |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116289296A (en) * | 2023-03-29 | 2023-06-23 | 华南理工大学 | Heat-conducting and insulating industrial aramid paper and preparation method thereof |
| CN116289296B (en) * | 2023-03-29 | 2024-04-05 | 华南理工大学 | Heat-conducting and insulating industrial aramid paper and preparation method thereof |
| CN116497625A (en) * | 2023-05-04 | 2023-07-28 | 山东仁丰特种材料股份有限公司 | Composite aramid paper and preparation method thereof |
| CN117304535A (en) * | 2023-11-01 | 2023-12-29 | 陕西科技大学 | Boron nitride nanosheet/aramid nanofiber composite film ball-milled by hydroxyethyl cellulose and preparation method |
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