CN115369680A - Nano alumina-aramid composite insulating paper and preparation method thereof - Google Patents
Nano alumina-aramid composite insulating paper and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000004760 aramid Substances 0.000 title claims description 77
- 229920003235 aromatic polyamide Polymers 0.000 title claims description 67
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 40
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 71
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 52
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 46
- 239000002121 nanofiber Substances 0.000 claims description 28
- 239000003513 alkali Substances 0.000 claims description 27
- 239000000725 suspension Substances 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 21
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000006185 dispersion Substances 0.000 claims description 15
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- 238000007731 hot pressing Methods 0.000 claims description 14
- 238000001291 vacuum drying Methods 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 238000000967 suction filtration Methods 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 9
- 239000011810 insulating material Substances 0.000 abstract description 4
- 239000000123 paper Substances 0.000 description 49
- 239000000835 fiber Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 239000000945 filler Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 239000011087 paperboard Substances 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- 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
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
-
- 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
- D21H21/50—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 form
- D21H21/52—Additives of definite length or shape
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
Abstract
The invention relates to the technical field of insulating material preparation, and discloses nano alumina-aramid fiber composite insulating paper and a preparation method thereof.
Description
Technical Field
The invention relates to the technical field of insulating material preparation, in particular to nano alumina-aramid composite insulating paper and a preparation method thereof.
Background
With the rapid development of the high-voltage and ultra-high voltage power transmission and transformation technology of a power grid, the long-term safe operation of the transformer is very important, the insulating paper is a key material of the transformer, and the aramid insulating paper becomes an ideal high-voltage and ultra-high voltage transformer insulating material due to excellent heat resistance and ultrahigh insulativity.
As publication (publication) No.: the invention discloses CN104846688B aramid fiber insulating paper and a preparation method thereof, wherein the preparation method comprises the following steps: the method comprises the following steps of (1) producing aramid chopped fibers by adopting a low-molecular-weight aramid polymerization liquid, producing aramid pulp by adopting a high-molecular-weight aramid polymerization liquid, and dispersing and defibering the aramid chopped fibers and the aramid pulp by adopting an ultrasonic disperser; mixing the aramid pulp treated by the ultrasonic disperser and aramid chopped fibers to form a mixed solution; wet papermaking treatment is carried out on the mixed solution by adopting a multilayer inclined wire former, and raw paper of 250-800g/m < 2 > is formed and made in one step; the aramid fiber insulation paper is formed by carrying out multi-channel calendering on the base paper under the conditions that the temperature is 100-180 ℃ and the linear pressure is 230-280Kg/cm, the aramid fiber pulp and the aramid fiber chopped fibers are treated by the ultrasonic disperser to form a mixed solution, the prepared aramid fiber insulation paper has good insulativity and flame retardance, but the aramid fiber insulation paper prepared by the low-molecular-weight chopped fibers and the high-molecular-weight aramid fiber pulp has good compactness and the mechanical property of the aramid fiber insulation paper is also difficult to guarantee, and the aramid fiber insulation paper is also disclosed (announced) as follows: the invention of CN101892611B discloses a processing technology of polysulfonamide insulation paper, which comprises the preparation of fibrid pulp and the preparation of long fiber pulp, and then the polysulfonamide insulation paper is prepared through the paper making process and the hot-press welding process, and the fibrid pulp is prepared: filtering the precipitating agent aqueous solution, performing pressure filtration on the polysulfonamide resin slurry, mixing in a precipitating machine, wherein the ratio of the inflow amount of the polysulfonamide resin slurry to the inflow amount of the dimethylacetamide is 1-28, entering a centrifugal washing machine through a precipitating fiber collecting tank, and centrifuging to remove water; preparing long fiber pulp: adding the long fiber into a centrifugal washing machine, washing for multiple times, and centrifuging to remove water; the papermaking process comprises the following steps: pulping the fibrid pulp, pulping the long fiber pulp, and mixing: 30-70% of fibrid pulp; 30-70% of long fiber pulp; the fiber paper mixed slurry sequentially enters a high-level box, a three-level sand remover, a slurry pool, a slurry stabilizing box and a slurry flowing box; papermaking through an inclined net, squeezing and drying; the polysulfonamide insulating paper prepared by the hot-press fusing process has good mechanical strength and dielectric property, but also has the problems of low heat resistance grade, poor compatibility and the like, and the resin causes the heat resistance of the insulating paper board to be reduced, and simultaneously damages the permeability and the compatibility of the insulating paper board to oil and paint, thereby seriously limiting the application of the insulating paper board.
In order to further improve the insulating property and stability of the aramid insulating paper, two approaches can be adopted: the aramid fiber is nanocrystallized, so that the compactness of a matrix is improved; (2) Inorganic nano-filler is introduced, and the respective advantages of the filler and the aramid fiber matrix are combined to prepare the organic-inorganic composite insulating material, but how to realize good dispersion and interface matching of the inorganic filler with different morphologies is a key problem at present.
Disclosure of Invention
The invention aims to provide nano alumina-aramid composite insulating paper and a preparation method thereof, aiming at the defects of the prior art.
The technical purpose of the invention is realized by the following technical scheme: a preparation method of nano alumina-aramid composite insulating paper comprises the following steps:
step S1, treating nano-alumina with different shapes by using a silane coupling agent, drying for later use, and meanwhile, pre-treating aramid fibers in a hot alkali solution with the mass fraction of 10% for 0.5h;
s2, fully mixing the alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water to form an aramid nanofiber suspension;
s3, weighing a proper amount of nano alumina, performing ultrasonic pre-dispersion for 0.5h in 10mL of dimethyl sulfoxide, slowly adding the nano alumina into the aramid nano fiber suspension in the S2, and continuously stirring for 24h;
and S4, carrying out suction filtration, vacuum drying and hot pressing on the mixture obtained in the step S3 to obtain the nano alumina-aramid composite insulating paper.
Preferably, the shapes of the nano alumina in the step S1 are spherical and flaky.
Preferably, the silane coupling agent in the step S1 is KH-550, and the mass fraction of the silane coupling agent is 0.5-1%.
Preferably, the nano alumina has a mass fraction of 5-30%.
Preferably, the vacuum drying temperature of the step S4 is 120 ℃, the hot pressing condition is 240-300 ℃, and the pressure is 10-20MPa.
Preferably, the weight ratio of the alkali-treated aramid fiber, the dimethyl sulfoxide, the potassium hydroxide and the deionized water in the step S2 is 1:400:2:20.
preferably, the hot alkaline solution of step S1 is a potassium hydroxide solution.
According to the nano alumina-aramid composite insulating paper prepared by the preparation method, the thickness of the insulating paper is 18-22 mu m, the volume resistivity is 2.4-5.8 omega-cm, and the breakdown strength is up to 186.4kv/mm.
Compared with the prior art, the scheme of the invention has the following beneficial effects:
according to the nano alumina-aramid composite insulating paper and the preparation method thereof, the good dispersion characteristic of spherical nano alumina and the special effect of the flaky alumina on increasing the breakdown path are utilized, so that the breakdown strength and stability of the aramid insulating paper are obviously improved, meanwhile, the interface bonding strength between the inorganic filler and the aramid nano fiber is effectively improved by using the silane coupling agent, the compactness, the transparency and the mechanical property of the aramid insulating paper are obviously improved, the preparation method is simple, the operability is strong, and the product can better meet the insulating index requirement in an extra-high voltage environment.
Drawings
FIG. 1 is a scanning electron microscope image of nano alumina-aramid fiber composite insulating paper with different morphologies;
FIG. 2 is a comparison graph of puncture resistance of nano alumina-aramid fiber composite insulating paper with different shapes.
Detailed Description
The invention provides a preparation method of nano alumina-aramid composite insulating paper, which comprises the following steps:
step S1, treating spherical or flaky nano-alumina with different shapes by using a silane coupling agent, drying for later use, and meanwhile, pre-treating aramid fibers in a hot alkali solution with the mass fraction of 10% for 0.5h;
step S2, mixing alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water according to a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
s3, weighing spherical and flaky nano-alumina with the mass fraction of 5-30%, performing ultrasonic pre-dispersion for 0.5h in 10mL of dimethyl sulfoxide, slowly adding the nano-alumina into the aramid nano-fiber suspension in the step S2, and continuously stirring for 24h;
and S4, carrying out suction filtration on the mixture obtained in the step S3, carrying out vacuum drying at 120 ℃ for 30min, and carrying out hot pressing at 240-300 ℃ under 10MPa for 2min to obtain the nano alumina-aramid composite insulating paper.
The silane coupling agent adopted by the invention is KH550, the dosage of the silane coupling agent is 0.5-1% of that of the alumina filler, good interface combination between the alumina fillers with different shapes and the aramid nano-fiber can be realized, the mass fraction of spherical or flaky nano-alumina in the aramid nano-fiber paper matrix is 5% -30%, and uniform dispersion of the alumina filler can be realized.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
(1) Treating spherical nano-alumina with silane coupling agent with mass fraction of 0.5%, and drying for later use; placing aramid fibers in a hot alkali solution (potassium hydroxide) with the mass fraction of 10% for pretreatment for 0.5h;
(2) Alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water are mixed according to a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
(3) Weighing 5% of spherical nano alumina, performing ultrasonic pre-dispersion in 10mL of dimethyl sulfoxide for 0.5h, slowly adding the spherical nano alumina into the aramid nano fiber suspension, and continuously stirring for 24h;
(4) And (3) carrying out suction filtration on the mixture, carrying out vacuum drying on the mixture for 30min at 120 ℃, and carrying out hot pressing at 240 ℃ and 10MPa for 2min to obtain the spherical nano alumina-aramid composite insulating paper.
The thickness of the insulating paper is about 22 μm, and the dielectric strength is 184.2kv/mm.
Example 2
(1) Treating spherical nano-alumina with silane coupling agent with mass fraction of 0.5%, and drying for later use; placing aramid fibers in a hot alkali solution (potassium hydroxide) with the mass fraction of 10% for pretreatment for 0.5h;
(2) Alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water are mixed according to a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
(3) Weighing 10% of spherical nano alumina, performing ultrasonic pre-dispersion in 10mL of dimethyl sulfoxide for 0.5h, slowly adding the spherical nano alumina into the aramid nano fiber suspension, and continuously stirring for 24h;
(4) And (3) carrying out suction filtration on the mixture, carrying out vacuum drying on the mixture for 30min at 120 ℃, and carrying out hot pressing at 240 ℃ and 10MPa for 2min to obtain the spherical nano alumina-aramid composite insulating paper.
The thickness of the insulating paper was tested to be about 21 μm and the dielectric strength was 169.7kv/mm.
Example 3
(1) Treating spherical nano-alumina with silane coupling agent with mass fraction of 0.5%, and drying for later use; placing aramid fibers in a hot alkali solution (potassium hydroxide) with the mass fraction of 10% for pretreatment for 0.5h;
(2) Alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water are mixed according to a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
(3) Weighing 20% of spherical nano alumina, performing ultrasonic pre-dispersion in 10mL of dimethyl sulfoxide for 0.5h, slowly adding the spherical nano alumina into the aramid nano fiber suspension, and continuously stirring for 24h;
(4) And (3) carrying out suction filtration on the mixture, carrying out vacuum drying on the mixture for 30min at 120 ℃, and carrying out hot pressing at 240 ℃ and 10MPa for 2min to obtain the spherical nano alumina-aramid composite insulating paper.
The thickness of the insulating paper is tested to be about 21 μm, and the dielectric strength is 152.7kv/mm.
Example 4
(1) Treating spherical nano-alumina with silane coupling agent with mass fraction of 0.5%, and drying for later use; placing aramid fibers in a hot alkali solution (potassium hydroxide) with the mass fraction of 10% for pretreatment for 0.5h;
(2) Alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water are mixed according to a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
(3) Weighing 30% of spherical nano alumina, performing ultrasonic pre-dispersion in 10mL of dimethyl sulfoxide for 0.5h, slowly adding the spherical nano alumina into the aramid nano fiber suspension, and continuously stirring for 24h;
(4) And (3) carrying out suction filtration on the mixture, carrying out vacuum drying on the mixture for 30min at 120 ℃, and carrying out hot pressing at 240 ℃ and 10MPa for 2min to obtain the spherical nano alumina-aramid composite insulating paper.
The thickness of the insulating paper is tested to be about 21 μm, and the dielectric strength is 138.4kv/mm.
Example 5
(1) Treating spherical nano-alumina with 1% by mass of silane coupling agent, and drying for later use; placing aramid fibers in a hot alkali solution (potassium hydroxide) with the mass fraction of 10% for pretreatment for 0.5h;
(2) Alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water are mixed according to a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
(3) Weighing 5% of spherical nano alumina, performing ultrasonic pre-dispersion in 10mL of dimethyl sulfoxide for 0.5h, slowly adding the spherical nano alumina into the aramid nano fiber suspension, and continuously stirring for 24h;
(4) And (3) carrying out suction filtration on the mixture, carrying out vacuum drying on the mixture for 30min at 120 ℃, and carrying out hot pressing at 240 ℃ and 10MPa for 2min to obtain the nano alumina-aramid nanofiber insulating paper.
The thickness of the insulating paper is about 22 μm, and the dielectric strength is 180.3kv/mm.
Example 6
(1) Treating the flaky nano-alumina with 1% by mass of silane coupling agent, and drying for later use; the aramid fiber is placed in hot alkali solution (potassium hydroxide) with the mass fraction of 10% for pretreatment for 0.5h;
(2) Alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water are mixed according to a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
(3) Weighing 5% of flaky nano alumina, performing ultrasonic pre-dispersion in 10mL of dimethyl sulfoxide for 0.5h, slowly adding the flaky nano alumina into the aramid nano fiber suspension, and continuously stirring for 24h;
(4) And (3) carrying out suction filtration on the mixture, carrying out vacuum drying on the mixture for 30min at 120 ℃, and carrying out hot pressing at 300 ℃ and 20MPa for 2min to obtain the flaky nano alumina-aramid composite insulating paper.
The thickness of the insulating paper is about 18 μm, and the dielectric strength is 184.4kv/mm.
Example 7
(1) Treating the flaky nano-alumina with 1% by mass of silane coupling agent, and drying for later use; the aramid fiber is placed in hot alkali solution (potassium hydroxide) with the mass fraction of 10% for pretreatment for 0.5h;
(2) Alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water are mixed according to a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
(3) Weighing 10% of flaky nano alumina, performing ultrasonic pre-dispersion in 10mL of dimethyl sulfoxide for 0.5h, slowly adding the flaky nano alumina into the aramid nano fiber suspension, and continuously stirring for 24h;
(4) And (3) carrying out suction filtration on the mixture, carrying out vacuum drying on the mixture for 30min at 120 ℃, and carrying out hot pressing at 300 ℃ and 20MPa for 2min to obtain the flaky nano alumina-aramid composite insulating paper.
The thickness of the insulating paper is about 19 μm and the dielectric strength is 172kv/mm.
Example 8
(1) Treating the flaky nano-alumina with 1% by mass of silane coupling agent, and drying for later use; placing aramid fibers in a hot alkali solution (potassium hydroxide) with the mass fraction of 10% for pretreatment for 0.5h;
(2) Alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water are mixed according to a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
(3) Weighing 20% of flaky nano alumina, performing ultrasonic pre-dispersion in 10mL of dimethyl sulfoxide for 0.5h, slowly adding the flaky nano alumina into the aramid nano fiber suspension, and continuously stirring for 24h;
(4) And (3) carrying out suction filtration on the mixture, carrying out vacuum drying on the mixture for 30min at 120 ℃, and carrying out hot pressing at 300 ℃ and 20MPa for 2min to obtain the flaky nano alumina-aramid composite insulating paper.
The thickness of the insulating paper is about 18 μm, and the dielectric strength is 150.8kv/mm.
Example 9
(1) Treating the flaky nano aluminum oxide with a silane coupling agent with the mass fraction of 1%, and drying for later use; placing aramid fibers in a hot alkali solution (potassium hydroxide) with the mass fraction of 10% for pretreatment for 0.5h;
(2) Alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water in a weight ratio of 1:400:2:20, fully mixing to form aramid nano-fiber suspension;
(3) Weighing 30% of flaky nano-alumina, performing ultrasonic pre-dispersion in 10mL of dimethyl sulfoxide for 0.5h, slowly adding the flaky nano-alumina into the aramid nano-fiber suspension, and continuously stirring for 24h;
(4) And (3) carrying out suction filtration on the mixture, carrying out vacuum drying on the mixture for 30min at 120 ℃, and carrying out hot pressing at 300 ℃ and 20MPa for 2min to obtain the flaky nano alumina-aramid composite insulating paper.
The thickness of the insulating paper is about 18 μm, and the dielectric strength is 126.8kv/mm.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. A preparation method of nano alumina-aramid composite insulating paper is characterized by comprising the following steps:
step S1, treating nano-alumina with different shapes by using a silane coupling agent, drying for later use, and meanwhile, pre-treating aramid fibers in a hot alkali solution with the mass fraction of 10% for 0.5h;
s2, fully mixing the alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water to form an aramid nanofiber suspension;
s3, weighing a proper amount of nano alumina, performing ultrasonic pre-dispersion for 0.5h in 10mL of dimethyl sulfoxide, slowly adding the nano alumina into the aramid nano fiber suspension in the S2, and continuously stirring for 24h;
and S4, carrying out suction filtration, vacuum drying and hot pressing on the mixture obtained in the step S3 to obtain the nano alumina-aramid composite insulating paper.
2. The preparation method of the nano alumina-aramid composite insulating paper as claimed in claim 1, wherein the nano alumina in the step S1 is spherical and flaky.
3. The preparation method of the nano alumina-aramid composite insulating paper as claimed in claim 1, wherein the silane coupling agent in the step S1 is KH-550, and the mass fraction of the silane coupling agent is 0.5-1%.
4. The preparation method of the nano alumina-aramid composite insulating paper as claimed in claim 1, wherein the nano alumina has a mass fraction of 5% -30%.
5. The preparation method of the nano alumina-aramid composite insulating paper as claimed in claim 1, wherein the vacuum drying temperature in the step S4 is 120 ℃, the hot pressing condition is 240-300 ℃, and the pressure is 10-20MPa.
6. The preparation method of the nano alumina-aramid composite insulating paper according to claim 1, wherein the weight ratio of the alkali-treated aramid fiber, dimethyl sulfoxide, potassium hydroxide and deionized water in the step S2 is 1:400:2:20.
7. the preparation method of the nano alumina-aramid composite insulating paper as claimed in claim 1, wherein the hot alkali solution in the step S1 is a potassium hydroxide solution.
8. The nano alumina-aramid composite insulation paper prepared according to any one of claims 1 to 5, characterized in that the insulation paper has a thickness of 18 to 22 μm, a volume resistivity of 2.4 to 5.8 Ω -cm and a puncture resistance of up to 186.4kv/mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115960471A (en) * | 2022-12-27 | 2023-04-14 | 安庆会通新材料有限公司 | Low-carbon-emission cyclic regeneration composite material and preparation method and application thereof |
| CN116024840A (en) * | 2022-12-13 | 2023-04-28 | 国网湖南省电力有限公司 | Carbon fluoride nanotube/aramid nanofiber composite insulating paper and preparation method thereof |
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| WO2016112523A1 (en) * | 2015-01-16 | 2016-07-21 | 阿尔斯通技术有限公司 | Nanometer aluminium oxide modified insulation paper and preparation method thereof |
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| CN112409613A (en) * | 2020-11-19 | 2021-02-26 | 陕西科技大学 | Preparation method of aramid nanofiber dispersion liquid |
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| CN116024840A (en) * | 2022-12-13 | 2023-04-28 | 国网湖南省电力有限公司 | Carbon fluoride nanotube/aramid nanofiber composite insulating paper and preparation method thereof |
| CN115960471A (en) * | 2022-12-27 | 2023-04-14 | 安庆会通新材料有限公司 | Low-carbon-emission cyclic regeneration composite material and preparation method and application thereof |
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