CN117488577A - Polyimide paper core bag belt based on aramid mica coating and preparation method thereof - Google Patents
Polyimide paper core bag belt based on aramid mica coating and preparation method thereof Download PDFInfo
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- CN117488577A CN117488577A CN202311436906.3A CN202311436906A CN117488577A CN 117488577 A CN117488577 A CN 117488577A CN 202311436906 A CN202311436906 A CN 202311436906A CN 117488577 A CN117488577 A CN 117488577A
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- 239000004760 aramid Substances 0.000 title claims abstract description 118
- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 117
- 239000004642 Polyimide Substances 0.000 title claims abstract description 101
- 229920001721 polyimide Polymers 0.000 title claims abstract description 101
- 239000010445 mica Substances 0.000 title claims abstract description 84
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 40
- 239000011248 coating agent Substances 0.000 title claims abstract description 27
- 238000000576 coating method Methods 0.000 title claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 88
- 239000002121 nanofiber Substances 0.000 claims abstract description 56
- 238000001035 drying Methods 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 12
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 64
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 42
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 37
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 238000002791 soaking Methods 0.000 claims description 22
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 19
- 229910052628 phlogopite Inorganic materials 0.000 claims description 19
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 19
- 238000004140 cleaning Methods 0.000 claims description 11
- 229920006231 aramid fiber Polymers 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 10
- 238000007731 hot pressing Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 239000011268 mixed slurry Substances 0.000 claims description 8
- 238000007790 scraping Methods 0.000 claims description 8
- 239000008399 tap water Substances 0.000 claims description 7
- 235000020679 tap water Nutrition 0.000 claims description 7
- 230000033444 hydroxylation Effects 0.000 claims description 6
- 238000005805 hydroxylation reaction Methods 0.000 claims description 6
- 239000004677 Nylon Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 claims description 3
- VLDPXPPHXDGHEW-UHFFFAOYSA-N 1-chloro-2-dichlorophosphoryloxybenzene Chemical compound ClC1=CC=CC=C1OP(Cl)(Cl)=O VLDPXPPHXDGHEW-UHFFFAOYSA-N 0.000 claims description 3
- 125000003118 aryl group Chemical group 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000007606 doctor blade method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005345 coagulation Methods 0.000 abstract 1
- 238000003892 spreading Methods 0.000 abstract 1
- 239000000499 gel Substances 0.000 description 40
- 238000005406 washing Methods 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000000741 silica gel Substances 0.000 description 8
- 229910002027 silica gel Inorganic materials 0.000 description 8
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000002585 base Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000005020 polyethylene terephthalate Substances 0.000 description 5
- 230000001376 precipitating effect Effects 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 239000004952 Polyamide Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 229920002647 polyamide Polymers 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 238000010345 tape casting Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229920004933 Terylene® Polymers 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 125000000879 imine group Chemical group 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/09—Sulfur-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
- D21H17/63—Inorganic compounds
- D21H17/64—Alkaline 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
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Removal Of Insulation Or Armoring From Wires Or Cables (AREA)
- Paper (AREA)
Abstract
The invention relates to the technical field of preparation of special cable core wrapping tape materials, in particular to a polyimide paper core wrapping tape based on an aramid mica coating and a preparation method thereof, wherein the preparation method comprises the following steps: s1, preparing polyimide fiber paper and aramid nanofiber gel; step 2: uniformly mixing the aramid nanofiber gel and mica flakes, then spreading the mixture on the surface of polyimide fiber paper, and drying to obtain the aramid mica-spread cable core wrapping tape. The method for forming the high-performance cable core taping by the aramid mica co-coagulation knife-coated polyimide fiber paper provided by the invention has high feasibility in the actual engineering process, and lays a foundation for mass production of products.
Description
Technical Field
The invention belongs to the technical field of preparation of cable auxiliary materials, and particularly relates to a polyimide paper core wrapping tape based on an aramid mica coating and a preparation method thereof.
Background
The mica flake has high insulation, corona resistance and high temperature resistance, is an indispensable auxiliary material for insulation and heat insulation of special cables, has strong interface inertia, and almost has no strength after being independently formed into paper. To solve this problem, conventional cable core taping material manufacture typically incorporates silica gel, PET base tape as an adhesive, reinforcement and support material. However, the silica gel has the temperature resistance of 115 ℃ and the PET has the temperature resistance of 160 ℃ and is low in temperature resistance level and easy to age, so that the overall insulativity, the temperature resistance and the service life of the cable core wrapping tape are reduced, and the application requirements of high-end cables in special fields such as nuclear power, high-speed rail locomotives, aerospace, national defense and military industry and the like cannot be met. In order to solve the problem, zhang Yun et al invent (ZL 201310114775.7) a composite core wrapping tape material using glass fiber cloth/terylene and the like as a supporting material, and avoid short plates caused by PET base tapes, but the use solvent of silica gel is toluene, which still causes volatile organic solvent pollution and causes environmental and human safety hazard. The invention discloses a polyimide fiber paper-based cable core wrapping tape with a base Yu Fangguan mica coating, which solves the problem of temperature resistance and volatilization of organic solvents.
Disclosure of Invention
Aiming at the problem that the silica gel limits the temperature resistance grade of the cable core wrapping tape and causes volatile organic solvents, the invention provides the polyimide paper core wrapping tape with the base Yu Fangguan mica coating and the preparation method thereof.
The invention is realized by the following technical scheme:
a preparation method of polyimide paper core bag strap based on aramid mica coating comprises the following steps:
s1, preparing polyimide fiber paper, hydroxylated mica flakes and aramid nanofiber gel;
the preparation method of the polyimide fiber paper comprises the following steps: firstly, soaking polyimide fibers in a soaking system prepared from potassium hydroxide solution/dimethyl sulfoxide solution, and then washing with acetic acid and drying to obtain activated polyimide fibers; then wet forming the activated polyimide fiber and aramid fibrid by a fluffer and a paper sheet former, and then squeezing, dehydrating and drying to obtain polyimide fiber paper;
the preparation method of the aramid nanofiber gel comprises the following steps: preparing Gao Nongfang nylon nanofiber gel by subjecting aramid fibers, potassium hydroxide solution and dimethyl sulfoxide to chemical cracking and filtering;
hydroxylation treatment of mica flakes: soaking phlogopite scales in a dilute sodium hydroxide solution for hours, and then cleaning and drying the phlogopite scales to obtain hydroxylated mica scales;
s2, uniformly stirring and mixing the aramid nanofiber gel, the polyvinyl alcohol solution and the hydroxylated phlogopite flake to obtain an aramid mica mixture;
s3, the aramid mica mixture is coated on the surface of polyimide fiber paper in a scraping mode, and the polyimide fiber/aramid mica composite cable core wrapping tape material is prepared through hot pressing and drying.
Preferably, in the preparation process of the polyimide fiber paper of the S1, the polyimide fiber is wholly aromatic polyimide fiber synthesized by pyromellitic dianhydride and p-phenylenediamine, and the soaking system is prepared from 0.5g/mL of potassium hydroxide solution and dimethyl sulfoxide according to the volume ratio of (1-3) mL: preparing 300mL, wherein the soaking time is 5-10 min; the concentration of the acetic acid is 0.001-0.008mol/L during cleaning.
Preferably, in the preparation process of the polyimide fiber paper in the step S1, the mass ratio of polyimide fibers to aramid fibrids is 6:4, the rotation number of the defibering is (15000-20000) and the concentration of the mixed slurry is (2.4-2.8) g/L.
Preferably, in the preparation process of the polyimide fiber paper in the step S1, when the paper is squeezed and dehydrated, the squeezing time is 8-10 min, and the pressure is 5-9 MPa; the drying time is (10-15) min, and the temperature is (110-120).
Preferably, in the hydroxylation treatment of the mica flake in S1, the concentration of dilute sodium hydroxide is (0.1-0.5) g/L, the washing is water washing, and the drying is vacuum oven (60-80) DEG C drying (5-6) h.
Preferably, in the preparation process of the aramid nanofiber gel in the S1, the aramid nanofiber gel is para-aramid fiber, potassium hydroxide solution and dimethyl sulfoxide according to (1-2 g) g: (1-3) mL: sequentially mixing (200-400) mL, and magnetically stirring (10-20) for h to obtain the aramid nanofiber solution.
Preferably, in the preparation process of the aramid nanofiber gel of the S1, the prepared aramid nanofiber solution is separated, fluffed and filtered by adding water to obtain the Gao Nongfang-fiber nanofiber gel with the concentration of (1-4) mg/mL.
Preferably, in S2, the aramid mica mixture is prepared from aramid nanofiber gel, polyvinyl alcohol solution and phlogopite flake according to (3-5) g: (1-2) mL: (6-10) g, wherein the concentration of the polyvinyl alcohol solution is (0.2-0.8) mg/mL.
Preferably, in S2, the blade coating amount of the aramid mica mixture is (20-25) g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The hot pressing and drying process is carried out at 100-105 deg.c and 5-8 MPa for 10-15 min.
A cable core wrapping tape prepared by a preparation method of polyimide paper core wrapping tape based on aramid mica coating.
Compared with the prior art, the invention has the following beneficial effects:
the preparation method of the polyimide paper core bag belt based on the aramid mica coating comprises the steps of polyimide fiber interfacial activation, polyimide fiber papermaking, mica flake hydroxylation, aramid nanofiber gel preparation, aramid mica knife coating compounding and the like, and the technical process has the advantages of being green, noiseless, efficient and the like while ensuring the self-adhesion of the mica. Secondly, aiming at the problems of low temperature resistance level, limited insulating property, toluene volatilization of organic solvent and the like caused by the traditional preparation of cable core wrapping tape material by using silica gel adhesive mica paper, the invention replaces silica gel adhesive and PET base tape with aramid nanofiber gel, adopts aramid nanofiber gel to adhere mica and is coated on the surface of polyimide fiber paper in a scraping way, thereby preparing the paper film composite high-performance cable core wrapping tape, and solving the environmental and safety problems brought by cable core wrapping tape adhesive silica gel in the existing market.
The polyimide paper core bag belt based on the aramid mica coating and the preparation method thereof provide that mica flakes, aramid nanofibers and polyvinyl alcohol are blended and adhered on the surface of polyimide fiber paper, so that the invention has higher feasibility in the actual engineering process, and lays a foundation for mass production.
In order to improve the combination of the paper fiber and the aramid cloud coating, the invention prehydrolyzes the polyimide fiber surface through alkali liquor and provides attachment sites. The mechanism is that the imine group is hydrolyzed by alkaline organic environment to form carboxyl active group.
Finally, in order to further enhance the binding force of the aramid fibers and the mica, the invention carries out pretreatment on the mica flakes through a sodium hydroxide solution to promote the mica flakes to form hydroxyl groups, and forms extensive hydrogen bonds with amide groups on the surface of the aramid fibers during drying, and in order to increase the contact surface formed by the hydrogen bonds, the invention preferably introduces polyvinyl alcohol rich in hydroxyl groups as a supplement, thereby completely avoiding the use of silica gel in the traditional process.
In addition, the reagents adopted in the preparation process are all conventional medicine reagents, the toxicity is low, the cost is low, the preparation is easy to obtain, the adopted equipment is conventional instrument equipment, a foundation is laid for the marketization of the technical products of the protected process, the cost is reduced, and the market competitiveness is improved.
Drawings
FIG. 1 is a flow chart of a method for preparing polyimide paper core bag strap based on aramid mica coating;
FIG. 2 is an SEM image of the surface of a polyimide fiber paper cable core wrap coated with a Yu Fangguan mica coating of example 1 of the present invention.
FIG. 3 is an SEM image of the surface of a polyimide fiber paper cable core wrap coated with a Yu Fangguan mica coating in example 3 of the present invention.
FIG. 4 is a SEM image of the cross-section of the tape of the polyimide fiber paper core of the present invention of example 5 of the present invention coated with the base Yu Fangguan mica.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention discloses a preparation method of polyimide paper core bag strap based on an aramid mica coating, which comprises the following steps with reference to figure 1:
s1, preparing polyimide fiber paper, hydroxylated mica flakes and aramid nanofiber gel.
The preparation method of the polyimide fiber paper comprises the following steps: firstly, a polyimide fiber (full aromatic polyimide fiber synthesized by pyromellitic dianhydride and p-phenylenediamine) is soaked for 5-10 min in a soaking system (prepared by 0.5g/mL of potassium hydroxide solution and 300mL of dimethyl sulfoxide according to the volume ratio of (1-3) mL) of potassium hydroxide solution to the dimethyl sulfoxide solution), and then is washed and dried by acetic acid (used for neutralizing residual alkali on the surface) with the concentration of 0.001-0.008mol/L, so that the activated polyimide fiber is obtained. Then the activated polyimide fiber and aramid fibrid are mixed according to the mass ratio of 6:4, wet forming by a fluffer and a sheet former, and then squeezing, dehydrating and drying to obtain polyimide fiber paper.
Wherein the revolution number of the fluffer is 15000-20000 revolutions when fluffing, and the concentration of the mixed slurry is 2.4-2.8 g/L. When the paper sheet former is formed by wet method, the paper is squeezed and dehydrated for 8-10 min, and the pressure is 5-9 MPa; the drying time is 10-15min, and the temperature is 110-120 ℃.
The preparation method of the aramid nanofiber gel comprises the following steps: preparing Gao Nongfang nylon nanofiber gel by subjecting aramid fibers, potassium hydroxide solution and dimethyl sulfoxide to chemical cracking and filtering; the method comprises the following steps: para-aramid fiber, potassium hydroxide solution, dimethyl sulfoxide according to (1-2 g) g: (1-3) mL: sequentially mixing (200-400) mL, and magnetically stirring (10-20) for h to obtain the aramid nanofiber solution. Then the prepared aramid nanofiber solution is separated, fluffed and filtered by adding water to obtain Gao Nongfang nylon nanofiber gel with the concentration of (1-4) mg/mL.
Hydroxylation treatment of mica flakes: soaking phlogopite scales in a dilute sodium hydroxide solution, cleaning and drying to obtain hydroxylated mica scales; the concentration of the dilute sodium hydroxide is (0.1-0.5) g/L, the washing is tap water washing, and the drying is that the vacuum oven is dried for (5-6) h at the temperature of (60-80).
S2, aramid nanofiber gel, polyvinyl alcohol solution with concentration of (0.2-0.8) mg/mL and hydroxylated phlogopite flake in the proportion of (3-5) g: (1-2) mL: (6-10) g, and obtaining an aramid mica mixture;
SS, the aramid mica mixture is coated with the doctor blade amount of (20-25) g/m 2 The polyimide fiber/aramid mica composite cable core taping material is prepared by knife coating on the surface of polyimide fiber paper and hot pressing and drying (the temperature is 100-105 ℃, the pressure is 5-8 MPa and the time is 10-15 min).
The invention also discloses a polyimide paper core bag belt prepared by the preparation method of the polyimide paper core bag belt based on the aramid mica coating.
Example 1
Step 1, according to the volume ratio of potassium hydroxide solution to dimethyl sulfoxide of 1mL: preparing a potassium hydroxide solution/dimethyl sulfoxide system by 300mL, soaking polyimide fibers in the potassium hydroxide solution/dimethyl sulfoxide system for 5min to realize microetching, cleaning with acetic acid, and drying for later use, wherein the concentration of the potassium hydroxide solution is 0.5g/mL, and the concentration of the acetic acid is 0.005mol/L;
step 2, precipitating polyimide fibers and aramid fibers after the last step of microetching according to the mass ratio of 6:4, preparing slurry to form mixed slurry with the concentration of 2.4g/L, fluffing 15000 turns by a fluffer, dehydrating by a paper sheet former, squeezing for 10min at 8MPa by a squeezer, and preparing polyimide fiber paper at 110 ℃ for 10min by a dryer;
step 3, soaking the phlogopite flakes in a dilute sodium hydroxide solution with the concentration of 0.1g/L for 5 hours, washing twice with tap water, and drying for 5 hours in a vacuum oven at the temperature of 60 ℃;
step 4: para-aramid fiber, potassium hydroxide solution and dimethyl sulfoxide are mixed according to 1g:1mL: sequentially mixing 200mL of the materials in proportion, and magnetically stirring the materials for 15 hours to obtain an aramid nanofiber solution; separating the prepared aramid nanofiber solution by adding water phase, fluffing and filtering to obtain Gao Nongfang polyamide nanofiber gel with the concentration of 1 mg/mL;
step 5: aramid nanofiber gel, polyvinyl alcohol solution and phlogopite flake are mixed according to 3g:1mL:6g of the mixture is uniformly mixed to prepare aramid mica gel, wherein the concentration of the polyvinyl alcohol solution is 0.2mg/mL;
step 6: according to 20g/m 2 The aramid mica gel is coated on the surface of polyimide fiber paper in a scraping way, and the polyimide fiber/aramid mica composite cable core wrapping tape is prepared through hot pressing and drying for 10min at the temperature of 105 ℃ under the pressure of 8 MPa.
The tape of the cable core prepared in example 1 has dielectric strength of 43.5kv/mm, limiting oxygen index of 44%, tensile strength of 63.2N/cm and volume resistivity of 9.1X10 as shown in FIG. 2 13 Omega.m, temperature resistant grade C (above 180 ℃). As can be seen from fig. 1, the polyimide fiber surface is densified by the aramid mica and the surface is quite smooth, and paper pores are not left, which means that the surface of the paper is well improved by doctor blade coating of the aramid mica gel.
Example 2
Step 1, according to the volume ratio of potassium hydroxide solution to dimethyl sulfoxide of 2mL: preparing a potassium hydroxide solution/dimethyl sulfoxide system by 300mL, soaking polyimide fibers in the potassium hydroxide solution/dimethyl sulfoxide system for 6min to realize microetching, cleaning with acetic acid, and drying for later use, wherein the concentration of the potassium hydroxide solution is 0.5g/mL, and the concentration of the acetic acid is 0.005mol/L;
step 2, precipitating polyimide fibers and aramid fibers after the last step of microetching according to the mass ratio of 6:4, preparing slurry to form mixed slurry with the concentration of 2.5g/L, fluffing 17000 turns by a fluffer, dehydrating by a paper sheet former, squeezing for 10min under 8MPa by a squeezer, and preparing polyimide fiber paper at 110 ℃ for 11min by a dryer;
step 3, soaking the phlogopite flakes in 0.3g/L dilute sodium hydroxide solution for 6 hours, washing twice with tap water, and drying for 5.5 hours at 70 ℃ in a vacuum oven;
step 4: para-aramid fiber, potassium hydroxide solution, dimethyl sulfoxide according to 1.5g:2mL: sequentially mixing 300mL of the materials in proportion, and magnetically stirring the materials for 17 hours to obtain an aramid nanofiber solution; separating the prepared aramid nanofiber solution by adding water phase, fluffing and filtering to obtain Gao Nongfang polyamide nanofiber gel with the concentration of 2mg/mL;
step 5: aramid nanofiber gel, polyvinyl alcohol solution and phlogopite flake are mixed according to the weight ratio of 4g:1mL:7g of the mixture is uniformly mixed to prepare aramid mica gel, wherein the concentration of the polyvinyl alcohol solution is 0.3mg/mL;
step 6: according to 21g/m 2 The aramid mica gel is coated on the surface of polyimide fiber paper in a scraping way, and the polyimide fiber/aramid mica composite cable core wrapping tape is prepared through hot pressing and drying for 10min at the temperature of 105 ℃ under the pressure of 8 MPa.
The cable-core wrap prepared in example 2 had a dielectric strength of 42.1kv/mm, an limiting oxygen index of 46%, a tensile strength of 61.4N/cm and a volume resistivity of 8.9X10 14 Omega.m, temperature resistant grade C (above 180 ℃).
Example 3
Step 1, according to the volume ratio of potassium hydroxide solution to dimethyl sulfoxide of 3mL: preparing a potassium hydroxide solution/dimethyl sulfoxide system by 300mL, soaking polyimide fibers in the potassium hydroxide solution/dimethyl sulfoxide system for 8min to realize microetching, cleaning with acetic acid, and drying for later use, wherein the concentration of the potassium hydroxide solution is 0.5g/mL, and the concentration of the acetic acid is 0.005mol/L;
step 2, precipitating polyimide fibers and aramid fibers after the last step of microetching according to the mass ratio of 6:4, preparing slurry to form mixed slurry with the concentration of 2.6g/L, fluffing 18000 turns by a fluffer, dehydrating by a paper sheet former, squeezing for 10min under 8MPa by a squeezer, and preparing polyimide fiber paper at 115 ℃ for 13min by a dryer;
step 3, soaking the phlogopite flakes in 0.3g/L dilute sodium hydroxide solution for 7 hours, washing twice with tap water, and drying for 5.7 hours in a vacuum oven at 70 ℃;
step 4: para-aramid fiber, potassium hydroxide solution, dimethyl sulfoxide according to 1.6g:2.5mL: sequentially mixing the materials in a proportion of 350mL, and magnetically stirring the materials for 17h to obtain an aramid nanofiber solution; separating the prepared aramid nanofiber solution by adding water phase, fluffing and filtering to obtain Gao Nongfang nanofiber gel with the concentration of 3mg/mL;
step 5: aramid nanofiber gel, polyvinyl alcohol solution and phlogopite flake are mixed according to the weight ratio of 4g:1.8mL:8g of the mixture is uniformly mixed to prepare aramid mica gel, wherein the concentration of the polyvinyl alcohol solution is 0.6mg/mL;
step 6: according to 24g/m 2 The aramid mica gel is coated on the surface of polyimide fiber paper in a scraping way, and the polyimide fiber/aramid mica composite cable core wrapping tape is prepared through hot pressing and drying for 10min at the temperature of 105 ℃ under the pressure of 8 MPa.
The tape for the cable core prepared in example 3 has a dielectric strength of 41.0kv/mm, a limiting oxygen index of 49%, a tensile strength of 74.5N/cm and a volume resistivity of 8.7X10, as shown in FIG. 3 15 Omega.m, temperature resistant grade C (above 180 ℃). From fig. 2, it can be known that the polyimide fibers and the mica flakes are tightly wrapped by the aramid nanofibers, and the paper does not leave any paper, which indicates that the doctor-blading of the aramid mica gel better improves the surface flatness of the paper and also indicates the strength source of the cable core wrapping tape.
Example 4
Step 1, according to the volume ratio of potassium hydroxide solution to dimethyl sulfoxide of 3mL: preparing a potassium hydroxide solution/dimethyl sulfoxide system by 300mL, soaking polyimide fibers in the potassium hydroxide solution/dimethyl sulfoxide system for 10min to realize microetching, cleaning with acetic acid, and drying for later use, wherein the concentration of the potassium hydroxide solution is 0.5g/mL, and the concentration of the acetic acid is 0.005mol/L;
step 2, precipitating polyimide fibers and aramid fibers after the last step of microetching according to the mass ratio of 6:4, preparing slurry to form mixed slurry with the concentration of 2.8g/L, fluffing 20000 turns by a fluffer, dehydrating by a paper sheet former, squeezing for 10min under 8MPa by a squeezer, and preparing polyimide fiber paper by a dryer at 120 ℃ for 15 min;
step 3, soaking the phlogopite flakes in a dilute sodium hydroxide solution with the concentration of 0.5g/L for 8 hours, washing twice with tap water, and drying for 6 hours in a vacuum oven at 80 ℃;
step 4: para-aramid fiber, potassium hydroxide solution and dimethyl sulfoxide are mixed according to 2g:3mL: sequentially mixing 400mL of the materials in proportion, and magnetically stirring the materials for 20 hours to obtain an aramid nanofiber solution; separating the prepared aramid nanofiber solution by adding water phase, untwining and filtering to obtain Gao Nongfang polyamide nanofiber gel with the concentration of 4 mg/mL;
step 5: aramid nanofiber gel, polyvinyl alcohol solution and phlogopite flake are mixed according to 5g:2mL: uniformly mixing 10g to obtain aramid mica gel, wherein the concentration of the polyvinyl alcohol solution is 0.8mg/mL;
step 6: according to 25g/m 2 The aramid mica gel is coated on the surface of polyimide fiber paper in a scraping way, and the polyimide fiber/aramid mica composite cable core wrapping tape is prepared through hot pressing and drying for 10min at the temperature of 105 ℃ under the pressure of 8 MPa.
The cable-core wrap prepared in example 3 had a dielectric strength of 45.4kv/mm, an limiting oxygen index of 46%, a tensile strength of 72.6N/cm and a volume resistivity of 8.5X10 14 Omega.m, temperature resistant grade C.
Example 5
Step 1, according to the volume ratio of potassium hydroxide solution to dimethyl sulfoxide of 3mL: preparing a potassium hydroxide solution/dimethyl sulfoxide system by 300mL, soaking polyimide fibers in the potassium hydroxide solution/dimethyl sulfoxide system for 10min to realize microetching, cleaning with acetic acid, and drying for later use, wherein the concentration of the potassium hydroxide solution is 0.5g/mL, and the concentration of the acetic acid is 0.005mol/L;
step 2, precipitating polyimide fibers and aramid fibers after the last step of microetching according to the mass ratio of 6:4, preparing slurry to form mixed slurry with the concentration of 2.7g/L, fluffing 19000 turns by a fluffer, dehydrating by a paper sheet former, squeezing for 10min under 8MPa by a squeezer, and preparing polyimide fiber paper at 118 ℃ for 13min by a dryer;
step 3, soaking the phlogopite flakes in a dilute sodium hydroxide solution with the concentration of 0.4g/L for 7 hours, washing twice with tap water, and drying for 6 hours in a vacuum oven at 70 ℃;
step 4: para-aramid fiber, potassium hydroxide solution and dimethyl sulfoxide are mixed according to 2g:1mL: sequentially mixing 200mL of the materials in proportion, and magnetically stirring the materials for 16 hours to obtain an aramid nanofiber solution; separating the prepared aramid nanofiber solution by adding water phase, fluffing and filtering to obtain Gao Nongfang polyamide nanofiber gel with the concentration of 2mg/mL;
step 5: aramid nanofiber gel, polyvinyl alcohol solution and phlogopite flake are mixed according to the weight ratio of 4g:1mL:6g of the mixture is uniformly mixed to prepare aramid mica gel, wherein the concentration of the polyvinyl alcohol solution is 0.7mg/mL;
step 6: according to 22g/m 2 The aramid mica gel is coated on the surface of polyimide fiber paper in a scraping way, and the polyimide fiber/aramid mica composite cable core wrapping tape is prepared through hot pressing and drying for 10min at the temperature of 105 ℃ under the pressure of 8 MPa.
The tape for the core prepared in example 5 has a dielectric strength of 42.7kv/mm, a limiting oxygen index of 42%, a tensile strength of 76.3N/cm and a volume resistivity of 8.7X10, as shown in FIG. 4 14 Omega.m, temperature resistant grade C. As can be seen from fig. 4, the surface of the polyimide fiber paper is tightly wrapped by the aramid mica layer and is a thin layer, which shows that after the doctor-blading of the aramid mica gel is dried, a good structure of the lower paper and the upper mask is formed. Indirectly reflects the function of the aramid mica layer, and has the advantages of assisting in improving strength and avoiding air breakdown effect caused by paper pores.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the technical solution of the present invention in any way, and it should be understood that the technical solution can be modified and replaced in several ways without departing from the spirit and principle of the present invention, and these modifications and substitutions are also included in the protection scope of the claims.
Claims (10)
1. The preparation method of the polyimide paper core bag belt based on the aramid mica coating is characterized by comprising the following steps of:
s1, preparing polyimide fiber paper, hydroxylated mica flakes and aramid nanofiber gel;
the preparation method of the polyimide fiber paper comprises the following steps: firstly, soaking polyimide fibers in a soaking system prepared from potassium hydroxide solution/dimethyl sulfoxide solution, and cleaning and drying to obtain activated polyimide fibers; then, forming the activated polyimide fiber and aramid fibrid by adopting a wet method to obtain polyimide fiber paper;
the preparation method of the aramid nanofiber gel comprises the following steps: preparing Gao Nongfang nylon nanofiber gel by using aramid fiber, potassium hydroxide solution and dimethyl sulfoxide through a chemical cracking method and filtering;
hydroxylation treatment of mica flakes: soaking phlogopite scales in a dilute sodium hydroxide solution, cleaning and drying to obtain hydroxylated mica scales;
s2, uniformly stirring and mixing the aramid nanofiber gel, the polyvinyl alcohol solution and the hydroxylated phlogopite flake to obtain an aramid mica mixture;
s3, the aramid mica mixture is coated on the surface of polyimide fiber paper in a scraping mode, and the polyimide fiber/aramid mica composite cable core wrapping tape material is prepared through hot pressing and drying.
2. The preparation method of the polyimide paper core bag belt based on the aramid mica coating according to claim 1, wherein in the preparation process of the polyimide fiber paper of S1, polyimide fibers are wholly aromatic polyimide fibers synthesized by pyromellitic dianhydride and p-phenylenediamine, and a soaking system is prepared from 0.5g/mL of potassium hydroxide solution and dimethyl sulfoxide according to the volume ratio (1-3) mL: preparing 300mL, wherein the soaking time is 5-10 min; the concentration of the acetic acid is 0.001-0.008mol/L during cleaning.
3. The preparation method of the polyimide paper core bag belt based on the aramid mica coating according to claim 1, wherein in the preparation process of the polyimide fiber paper of the S1, the mass ratio of polyimide fibers to aramid fibrids is 6:4, the rotation number of the defibering is (15000-20000) and the concentration of the mixed slurry is (2.4-2.8) g/L.
4. The preparation method of the polyimide paper core bag belt based on the aramid mica coating, which is characterized in that in the preparation process of the polyimide fiber paper of S1, when the paper is squeezed and dehydrated, the squeezing time is 8-10 min, and the pressure is 5-9 MPa; the drying time is (10-15) min, and the temperature is (110-120).
5. The method for preparing the polyimide paper core bag belt based on the aramid mica coating according to claim 1, wherein in the hydroxylation treatment of the mica flake in the step S1, the concentration of dilute sodium hydroxide is (0.1-0.5) g/L, the polyimide paper core bag belt is washed by tap water, and is dried by a vacuum oven at the temperature of (60-80) ℃ for (5-6) h.
6. The method for preparing the polyimide paper core bag belt based on the aramid mica coating according to claim 1, wherein in the preparation process of the aramid nanofiber gel of the S1, the aramid nanofiber gel is para-aramid fiber, potassium hydroxide solution and dimethyl sulfoxide according to (1-2 g) g: (1-3) mL: sequentially mixing (200-400) mL, and magnetically stirring (10-20) for h to obtain the aramid nanofiber solution.
7. The method for preparing the polyimide paper core bag belt based on the aramid mica coating according to claim 6, wherein in the preparation process of the aramid nanofiber gel of S1, the prepared aramid nanofiber solution is separated by adding water, fluffed and filtered to obtain the Gao Nongfang-fiber nanofiber gel with the concentration of (1-4) mg/mL.
8. The method for preparing the polyimide paper core bag belt based on the aramid mica coating according to claim 1, wherein in the step S2, the aramid mica mixture is prepared from the aramid nanofiber gel, the polyvinyl alcohol solution and the phlogopite flake according to the following steps (3-5) g: (1-2) mL: (6-10) g, wherein the concentration of the polyvinyl alcohol solution is (0.2-0.8) mg/mL.
9. The preparation method of polyimide paper core bag strap based on aramid mica coating as recited in claim 1The method is characterized in that in S2, the doctor blade coating amount of the aramid mica mixture is (20-25) g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The hot pressing and drying process is carried out at 100-105 deg.c and 5-8 MPa for 10-15 min.
10. A cable-core tape prepared by the preparation method of the polyimide paper-core tape based on the aramid mica coating as claimed in any one of claims 1 to 9.
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