CN114214867A - Corona-resistant aramid/mica insulation paper and preparation method thereof - Google Patents

Corona-resistant aramid/mica insulation paper and preparation method thereof Download PDF

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CN114214867A
CN114214867A CN202111554355.1A CN202111554355A CN114214867A CN 114214867 A CN114214867 A CN 114214867A CN 202111554355 A CN202111554355 A CN 202111554355A CN 114214867 A CN114214867 A CN 114214867A
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aramid
mica
paper
corona
resistant
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陆赵情
杨凯伦
闫宁
贾峰峰
张雨婷
马秦
高坤
花莉
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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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
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/38—Inorganic fibres or flakes siliceous
    • D21H13/44—Flakes, e.g. mica, vermiculite
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/53—Polyethers; Polyesters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board

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  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
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Abstract

The invention provides corona-resistant aramid/mica insulation paper and a preparation method thereof, wherein the method comprises the following steps of; step 1, firstly defibering aramid chopped fibers, polyoxyethylene and water, and then adding aramid fibrids for defibering to obtain first slurry; step 2, adding a white mica sheet into the first slurry for defibering to obtain a second slurry, wherein the total mass of the aramid chopped fibers, the aramid fibrids and the white mica sheet in the second slurry accounts for 0.04-0.07 percent; and 3, sequentially carrying out dehydration forming, squeezing, drying and hot pressing on the second sizing agent to obtain the aramid fiber/mica insulation paper. According to the invention, the high-temperature-resistant and corona-resistant muscovite chips are added into the aramid paper manufacturing process, so that the corona resistance of the aramid paper is greatly improved, the problem that the aramid paper is easy to age due to repeated electric shock under high temperature and high pressure is avoided, and the application requirement of equipment on the long life cycle of insulation is met.

Description

Corona-resistant aramid/mica insulation paper and preparation method thereof
Technical Field
The invention relates to the technical field of papermaking and insulating material preparation, in particular to corona-resistant aramid/mica insulating paper and a preparation method thereof.
Background
Mica is a silicate mineral having a lamellar structure in nature, and is widely used in the fields of insulation, building materials, cosmetics, light industry, traffic, aviation and the like due to its excellent high temperature resistance, insulating properties, chemical stability and the like. Among them, muscovite is most widely used because of its excellent insulation and stability, and large yield. Mica paper is a flaky material formed by wet-process papermaking of mica flakes, but the mica flakes are lapped by electrostatic force and van der waals force, so that the strength and the interface bonding performance of pure mica paper are poor, and therefore, various adhesives and reinforcing materials are usually added into a mica product to improve the mechanical property of the material.
The existence of the adhesive reduces the content of mica, so that the heat resistance of the mica paper is poor, the application of the mica paper base material under severe conditions such as high temperature and high pressure is limited, the common reinforcing material is combined with the mica layer by layer, and the difference of the performance and the interface between the two materials can cause charge aggregation and partial discharge of the insulating material due to uneven distribution in an electric field, so that the insulating material is punctured and permanently fails, and therefore, the pure mica paper or the mica insulating paper added with the adhesive or the reinforcing material has the problems of complex preparation process, low strength, poor heat resistance and short service life.
Disclosure of Invention
Aiming at the problem of poor corona resistance of the existing aramid paper, the corona-resistant aramid/mica insulation paper and the preparation method thereof provided by the invention have the advantages that the corona resistance of the aramid paper is greatly improved by adding the high-temperature-resistant and corona-resistant muscovite flakes into the manufacturing process of the aramid paper, the problem that the aramid paper is easy to age due to repeated electric shock under high temperature and high pressure is avoided, and the application requirement of equipment on the long insulation life cycle is met.
The invention is realized by the following technical scheme:
a preparation method of corona-resistant aramid/mica insulation paper comprises the following steps;
step 1, firstly defibering aramid chopped fibers, polyoxyethylene and water, and then adding aramid fibrids for defibering to obtain first slurry;
step 2, adding a white mica sheet into the first slurry for defibering to obtain a second slurry, wherein the total mass of the aramid chopped fibers, the aramid fibrids and the white mica sheet in the second slurry accounts for 0.04-0.07 percent;
and 3, sequentially carrying out dehydration forming, squeezing, drying and hot pressing on the second sizing agent to obtain the aramid fiber/mica insulation paper.
Preferably, the ratio of the total mass of the aramid chopped fibers, the aramid fibrids and the muscovite sheets to water in the step 1 is 2.83 g: 2L, the mass ratio of the aramid chopped fibers to the aramid fibrids is 3: 7.
preferably, the mass of the muscovite sheet in the step 1 is 30-70% of the total mass of the muscovite sheet, the aramid chopped fiber and the aramid fibrid.
Preferably, the aramid chopped fibers in the step 1 are meta-aramid chopped fibers cleaned by a sodium dodecyl benzene sulfonate solution, the aramid fibrids are meta-aramid fibrids subjected to pulping treatment, the meta-aramid chopped fibers are firstly defibered in water for 10000-25000 turns, and then the meta-aramid fibrids are added to defiber for 5000-10000 turns;
and 2, adding white mica sheets into the first slurry, and then defibering for 2500-.
Preferably, the addition amount of the polyoxyethylene in the step 1 is 0.1-0.9% of the total mass of the muscovite chips, the aramid chopped fibers and the aramid fibrids.
Preferably, step 1, firstly, a polyoxyethylene aqueous solution with the concentration of 0.5706g/l and aramid chopped fibers are added into water for defibering, and the volume ratio of the polyoxyethylene aqueous solution to the water is (1-9): 400.
Preferably, in the step 2, after the muscovite flakes are added into the first slurry for defibering, water is added, and the first slurry is homogenized by a homogenizing roller or a bubble method to obtain a second slurry, wherein the number of times of vertical stirring is 5-10 times when the first slurry is homogenized by the homogenizing roller, and the time of homogenizing is 5-10s when the first slurry is homogenized by the bubble method.
Preferably, in step 3, the second slurry is dehydrated and formed on the forming wire under the action of vacuum suction, and after forming, the second slurry is continuously sucked for 5 to 10 seconds and then pressed for 3 to 6 minutes under the pressure of 0.2 to 0.6 MPa.
Further, step 3, drying the squeezed aramid fiber/mica paper for 8-20min, and finally hot-pressing the obtained aramid fiber/mica paper for 5-20min at 120 ℃ and 10-20 MPa.
A corona-resistant aramid/mica insulation paper obtained by the preparation method of any one of the corona-resistant aramid/mica insulation paper.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a preparation method of corona-resistant aramid fiber/mica insulation paper, which comprises the steps of sequentially defibering aramid chopped fibers, aramid fibrids and muscovite sheets in water, dispersing the aramid chopped fibers, the aramid fibrids and the muscovite sheets by polyethylene oxide to form an aramid fiber/muscovite mixed slurry suspension, and then directly preparing the aramid fiber/mica insulation paper by a wet papermaking method, wherein the high-strength rod-shaped aramid chopped fibers play a skeleton role in the paper, the interweaving of the aramid chopped fibers provides mechanical strength for the aramid fiber/mica insulation paper, the film-shaped aramid fibrids have large specific surface area, can coat the aramid chopped fibers and the muscovite sheets, fills gaps in the paper, and improves the interface bonding force between the aramid fibrids and the aramid chopped fibers, the aramid chopped fibers and the aramid fibrids and between the aramid fibrids and the mica. The muscovite sheet can exert excellent dielectric strength and high temperature resistance in paper. Compared with a mica product with mechanical property enhanced by adding an adhesive and natural fibers, the aramid fiber/mica insulation paper prepared by the method combines the high strength, temperature resistance and insulation property of the aramid fiber and the corona resistance, temperature resistance, chemical stability and other excellent properties of the muscovite sheet. The invention has simple process and high preparation efficiency, and the obtained material has high mechanical strength, excellent insulativity, good corona resistance, high temperature resistance and good environmental adaptability, and has wide application prospect in the motor insulation fields of high-voltage motor insulation, high-voltage transformer insulation, coil wrapping insulation, inter-turn insulation and the like.
Furthermore, when the content of the muscovite chips in the muscovite chips, the aramid chopped fibers and the aramid fibrids is less than 30%, the aramid chopped fibers and the aramid fibrids account for main components, the aramid chopped fibers can better exert high mechanical properties of the aramid chopped fibers, and the fibrids with sufficient content can better play a role in coating and bonding, so that the aramid/mica insulating paper has higher tensile index and interlayer bonding strength, and the aramid/mica insulating paper has good mechanical properties. However, the electrical insulation performance of the aramid chopped fibers and the aramid fibrids is poor compared with that of the muscovite chips, and the breakdown strength of the aramid/mica insulation paper is slightly low due to the lower content of the muscovite chips; when the content of the white mica sheets in the white mica sheets, the aramid chopped fibers and the aramid fibrids is increased to be more than 70%, the white mica sheets are easy to form a continuous structure, when the aramid fiber/mica insulation paper is under the action of voltage, the white mica sheets with high insulation performance can better obstruct the passage of current, the breakdown strength of the aramid fiber/mica insulation paper is improved, but the reduction of the content of the aramid chopped fibers and the aramid fibrids brings the weakening of the reinforcing effect, and the tensile strength and the interlayer bonding strength of the aramid fiber/mica insulation paper are reduced. Therefore, the content of the muscovite chips is one of key parameters for preparing the aramid fiber/mica insulating paper, and when the content of the muscovite chips is 30-70%, the obtained aramid fiber mica has excellent insulating property and mechanical property relatively.
Drawings
Fig. 1 is a diagram of an embodiment of the aramid mica paper prepared in example 1 of the present invention.
Fig. 2 is a surface topography diagram of the non-hot-pressed aramid mica base paper prepared in example 3 of the present invention.
Fig. 3 is a cross-sectional view of a non-hot-pressed aramid mica base paper prepared in example 3 of the present invention.
Fig. 4 is a surface topography diagram of the aramid/mica insulation paper prepared in example 3 of the present invention.
Fig. 5 is a cross-sectional view of aramid/mica insulation paper prepared in example 3 of the present invention.
Figure 6 is a graph of the tensile strength of aramid/mica insulation paper of different mica content prepared in examples 1-5 of the present invention.
FIG. 7 shows the interlayer bond strength of aramid/mica insulation paper with different mica contents prepared in examples 1-5 of the present invention.
Fig. 8 is a graph of the breakdown strength of aramid/mica insulation papers of different mica contents prepared in examples 1-5 of the present invention.
FIG. 9 is a thermogravimetric plot of aramid/mica insulation papers of different mica contents prepared in examples 1-5 of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Aramid fiber is an artificially synthesized organic fiber, has the characteristics of light weight, high strength, acid and alkali resistance, flame retardance, flexible design, excellent insulating property and high temperature resistance and the like, and is widely applied to the modern high-tech fields of electronics and electricians, national defense and military, aerospace, rail transit and the like. The aramid fiber and the muscovite sheet are mixed and made to prepare the aramid mica paper, so that gum dipping and reinforcing laminating processes in the traditional mica paper preparation process can be omitted, and meanwhile, the aramid fiber has excellent mechanical properties and excellent insulating and high-temperature resistant properties, so that the mechanical properties of the mica insulating paper base material can be greatly improved due to the addition of the aramid fiber, and the electrical properties of the paper base material cannot be greatly lost.
Based on the thought, the invention provides a preparation method of corona-resistant aramid/mica insulation paper, which comprises the following steps:
step 1, the use concentration is (1X 10)-3-1.5×10-3) Washing the aramid chopped fibers for 30-90min at 40-65 ℃ by using a mol/L sodium dodecyl benzene sulfonate solution, and then washing and drying the aramid chopped fibers for later use. And (3) refining the aramid fibrid by a refiner (PFI), and sealing and storing for later use.
And 2, defibering the aramid chopped fibers in 2L of water by using a defibering device at 10000-25000 revolutions, adding a dispersant polyethylene oxide (PEO) during defibering, preparing 0.5706g/L of a polyethylene oxide solution in advance, usually preparing 100-250ml of the solution, performing magnetic stirring and dispersing for 2-3 hours, adding a certain amount of the solution in a volumetric flask, adding the aramid fibrid obtained in the step 1 into the volumetric flask every time when dispersing the fibers, defibering the aramid fibrid and the aramid chopped fibers together at the revolution of 5000-10000 revolutions, calculating the aramid fibrid by absolute dry amount, actually adding the aramid fibrid containing water, calculating the water of the aramid fibrid in advance, and adding the aramid fibrid in a wet state. And adding a muscovite sheet, wherein the mass of the muscovite sheet is 30-70% of the total mass of the muscovite sheet, the aramid chopped fiber and the aramid fibrid, mixing and defibering, the revolution is 2500-3500 revolutions, the mass of the PEO is 0.1-0.9% of the total mass of the muscovite sheet, the aramid chopped fiber and the aramid fibrid, and the volume of the corresponding polyethylene oxide solution is 5-45ml, so as to form uniformly dispersed mixed slurry containing the aramid fiber and the muscovite.
The oven dry mass of the theoretical paper is equal to the total mass of the muscovite chips, the aramid chopped fibers and the aramid fibrids, the oven dry mass is set in advance and can be obtained through theoretical paper quantification, and the theoretical paper quantification can also be set in advance, for example, the theoretical paper quantification can be set to be 90g/m2Then the cross-sectional area of the sheet former of step 3, i.e. the size of the paper, is also determined, the cross-sectional area of the selected sheet former of the invention is 0.0314m2The theoretical oven dry mass of the paper thus obtained is also determined (2.83g), but in practice there is a certain loss of the final oven dry mass of the paper.
Step 3, the cross section area is 0.0314m2The paper sheet former is characterized in that 2-4L of water is added into a pulp storage chamber, then the mixed pulp obtained in the step (2) is poured into the pulp storage chamber to form pulp with the concentration of 0.04-0.07 wt%, namely the total mass of the aramid chopped fibers, the aramid fibrids and the muscovite sheets accounts for 0.04-0.07% of the pulp. Homogenizing by stirring with a homogenizing roller or a bubble method, wherein the stirring times are 5-10 times; when the air bubble method is adopted for homogenization, the homogenization time is 5-10 s.
And (3) dehydrating and forming the slurry through a forming net with the diameter of 200mm and the mesh number of 200 under the vacuum suction effect, and after the water filtration of the slurry is finished, performing vacuum suction for 5-10 s.
And 4, squeezing the formed aramid/mica paper under the pressure of 0.2-0.6MPa for 3-6min, and drying in a paper sheet dryer for 8-20 min.
And 5, hot-pressing the aramid mica base paper by using a flat vulcanizing machine to improve the density of the paper, wherein the hot-pressing temperature is 120 ℃, the pressure is 10-20MPa, and the time is 5-20min, so that the corona-resistant aramid/mica insulating paper is obtained.
Example 1
The invention relates to a preparation method of corona-resistant aramid/mica insulation paper, which comprises the following steps,
step 1, use concentration of 1 × 10-3And (3) washing the meta-aramid chopped fibers for 30min at 40 ℃ by using a mol/L sodium dodecyl benzene sulfonate solution, and then washing and drying the meta-aramid chopped fibers for later use. And (3) pulping the meta-aramid fibrid by a pulping machine (PFI), and sealing for later use.
And 2, defibering 0.60g of meta-aramid chopped fibers in 2L of water for 25000 revolutions, adding a polyethylene oxide dispersant (PEO) accounting for 0.9 percent of the total mass of the white mica sheets, the aramid chopped fibers and the aramid fibrids during defibering, adding 1.39g of meta-aramid fibrids, and defibering the meta-aramid fibrids and the aramid chopped fibers together for 8000 revolutions. Then adding a muscovite sheet (the mass of the muscovite sheet is 30 percent of the total mass of the muscovite sheet, the aramid chopped fiber and the aramid precipitated fiber), mixing and defibering for 2000 turns to form uniformly dispersed mixed slurry.
And 3, adding 2L of water into a pulp storage chamber of the paper sheet former, and pouring the 2L of mixed pulp into the pulp storage chamber to form 0.07% pulp. Homogenizing for 6 times by stirring with homogenizing roller, dewatering and shaping the pulp with 200mm diameter and 200 mesh forming net under vacuum suction, and vacuum sucking for 10s after the water filtration of pulp is finished.
And 4, squeezing the formed aramid fiber mica paper for 3min under the pressure of 0.4MPa, and drying in a paper sheet dryer for 10 min.
And 5, hot-pressing the aramid mica paper by using a flat vulcanizing machine, wherein the hot-pressing temperature is 120 ℃, the pressure is 20MPa, and the time is 10min, so that the corona-resistant aramid/mica insulating paper is obtained.
From fig. 1, it can be seen that the obtained aramid/mica paper is soft in shape and has a muscovite gloss on the surface.
Fig. 6, 7, 8 and 9 are graphs of tensile index, interlayer bonding strength, breakdown strength and thermogravimetry of aramid mica paper with 30% mica content, respectively. The tensile index, the interlayer bonding strength and the breakdown strength of the aramid fiber mica paper containing 30 percent of mica respectively reach 10.63 N.m/g and 146.86J/m27.35kV/mm, and the thermal decomposition temperature is about 400 ℃. The aramid mica paper has the advantages of good mechanical property, close interlayer bonding, high breakdown strength and good thermal stability.
Example 2
The invention relates to a preparation method of corona-resistant aramid/mica insulation paper, which comprises the following steps,
step 1, the use concentration is 1.2X 10-3And (3) washing the meta-aramid chopped fibers for 40min at 60 ℃ by using a mol/L sodium dodecyl benzene sulfonate solution, and then washing and drying the meta-aramid chopped fibers for later use. And (3) pulping the meta-aramid fibrid by a pulping machine (PFI), and sealing for later use.
And 2, defibering 0.51g of meta-aramid chopped fibers in 2L of water for 15000 turns, adding a polyethylene oxide dispersing agent (PEO) accounting for 0.3 percent of the total mass of the white mica sheets, the aramid chopped fibers and the aramid fibrids during defibering, adding 1.19g of meta-aramid fibrids, and defibering the meta-aramid fibrids and the aramid chopped fibers together for 10000 turns. Then adding a white mica sheet (the mass of the white mica sheet is 40 percent of the total mass of the white mica sheet, the aramid chopped fiber and the aramid precipitated fiber), mixing and defibering for 2500 turns to form uniformly dispersed mixed slurry.
And 3, adding 2.5L of water into a pulp storage chamber of the paper sheet former, and pouring the 2L of mixed pulp into the pulp storage chamber to form 0.06% pulp. Homogenizing for 8s by air bubble method, dewatering and molding the pulp with 200mm diameter and 200 mesh forming net under vacuum suction, and vacuum sucking for 8s after the water filtration of the pulp is finished.
And 4, squeezing the formed aramid fiber mica paper under the pressure of 0.3MPa for 4min, and drying in a paper sheet dryer for 15 min.
And 5, hot-pressing the aramid mica paper by using a flat vulcanizing machine, wherein the hot-pressing temperature is 120 ℃, the pressure is 20MPa, and the time is 10min, so that the corona-resistant aramid/mica insulating paper is obtained.
Fig. 6, 7, 8 and 9 are graphs of tensile index, interlayer bonding strength, breakdown strength and thermogravimetry of aramid mica paper with a mica content of 40%, respectively. The tensile index, interlayer bonding strength and breakdown strength of the aramid fiber mica paper containing 40% of mica respectively reach 10.05 N.m/g and 141.83J/m28.03kV/mm, and the thermal decomposition temperature is about 400 ℃. Compared with example 1, the content of mica is increased by 10%, the puncture strength of the aramid mica paper is improved by 8.47%, and the tensile index and the interlayer bonding strength are respectively reduced by 5.52% and 3.43%.
Example 3
The invention relates to a preparation method of corona-resistant aramid/mica insulation paper, which comprises the following steps,
step 1, the use concentration is 1.5X 10-3And (3) washing the meta-aramid chopped fibers for 50min by using a mol/L sodium dodecyl benzene sulfonate solution at 50 ℃, and then washing and drying the meta-aramid chopped fibers for later use. And (3) pulping the meta-aramid fibrid by a pulping machine (PFI), and sealing for later use.
And 2, defibering 0.42g of meta-aramid chopped fibers in 2L of water for 20000 revolutions, adding a polyethylene oxide dispersant (PEO) accounting for 0.5 percent of the total mass of the white mica sheets, the aramid chopped fibers and the aramid fibrids during defibering, adding 1.00g of meta-aramid fibrids, and defibering the mixture together with the aramid chopped fibers for 7000 revolutions. Then adding a white mica sheet (the mass of the white mica sheet is 50 percent of the total mass of the white mica sheet, the aramid chopped fiber and the aramid precipitated fiber), mixing and defibering for 3000 turns to form uniformly dispersed mixed slurry.
And 3, adding 2.5L of water into a pulp storage chamber of the paper sheet former, and pouring the 2L of mixed pulp into the pulp storage chamber to form 0.06% pulp. Homogenizing by stirring with a homogenizing roller for 7 times, dewatering and shaping the pulp with a forming net with diameter of 200mm and mesh number of 200 under vacuum suction, and vacuum-sucking for 10s after the water filtration of the pulp is finished.
And 4, squeezing the formed aramid fiber mica paper under the pressure of 0.2MPa for 5min, and drying in a paper sheet dryer for 20 min.
And 5, hot-pressing the aramid mica paper by using a flat vulcanizing machine, wherein the hot-pressing temperature is 120 ℃, the pressure is 20MPa, and the time is 10min, so that the corona-resistant aramid/mica insulating paper is obtained.
Fig. 2 and 3 show the surface morphology of the non-hot-pressed aramid mica base paper, and as can be seen from fig. 2 and 3, the surface and interlayer structure of the non-hot-pressed aramid mica base paper are loose, and pores appear at the joint of the aramid chopped fiber and mica; fig. 4 and 5 are morphology diagrams of aramid mica paper after being hot-pressed for 10min at 120 ℃ and 20MPa, fibrids are heated and melted to better coat and bond aramid chopped fibers and mica, the structure of the aramid mica paper becomes compact, and meta-aramid chopped fibers are interwoven to form a fiber network structure. Fig. 6, 7, 8 and 9 are graphs of tensile index, interlayer bonding strength, breakdown strength and thermogravimetry of aramid mica paper with a mica content of 50%, respectively. The tensile index, interlayer bonding strength and breakdown strength of the aramid mica paper containing 50 percent of mica respectively reach9.48 N.m/g, 125.80J/m28.68kV/mm, and the thermal decomposition temperature is about 400 ℃. Compared with example 2, the content of mica is increased by 10%, the puncture strength of the aramid mica paper is improved by 7.54%, and the tensile index and the interlayer bonding strength are respectively reduced by 5.61% and 11.30%.
Example 4
The invention relates to a preparation method of corona-resistant aramid/mica insulation paper, which comprises the following steps,
step 1, the use concentration is 1.2X 10-3And (3) washing the meta-aramid chopped fibers for 60min at 40 ℃ by using a mol/L sodium dodecyl benzene sulfonate solution, and then washing and drying the meta-aramid chopped fibers for later use. And (3) pulping the meta-aramid fibrid by a pulping machine (PFI), and sealing for later use.
And 2, defibering 0.34g of meta-aramid chopped fibers in 2L of water for 25000 turns, adding a polyethylene oxide dispersing agent (PEO) accounting for 0.7 percent of the total mass of the white mica sheets, the aramid chopped fibers and the aramid fibrids during defibering, adding 0.79g of meta-aramid fibrids, and defibering the meta-aramid fibrids and the aramid chopped fibers for 5000 turns together. Then adding a muscovite sheet (the mass of the muscovite sheet is 60 percent of the total mass of the muscovite sheet, the aramid chopped fiber and the aramid precipitated fiber), mixing and defibering for 3500 turns to form uniformly dispersed mixed slurry.
And 3, adding 3L of water into a pulp storage chamber of the paper sheet former, and pouring 2L of mixed pulp into the pulp storage chamber to form 0.06% pulp. Homogenizing for 7s by air bubble method, dewatering and molding the slurry with 200mm diameter and 200 mesh forming net under vacuum suction, and vacuum sucking for 8s after the water filtration of the pulp is finished.
And 4, squeezing the formed aramid fiber mica paper under the pressure of 0.5MPa for 4min, and drying in a paper sheet dryer for 15 min.
And 5, hot-pressing the aramid mica paper by using a flat vulcanizing machine, wherein the hot-pressing temperature is 120 ℃, the pressure is 20MPa, and the time is 10min, so that the corona-resistant aramid/mica insulating paper is obtained.
FIG. 6, FIG. 7, FIG. 8 and FIG. 9 are respectively a tensile index, an interlayer bonding strength, a puncture strength and a thermogravimetric analysis of an aramid mica paper containing 60% micaGraph is shown. The tensile index, the interlayer bonding strength and the breakdown strength of the aramid fiber mica paper containing 60 percent of mica respectively reach 9.03 N.m/g and 119.73J/m28.70kV/mm, and the thermal decomposition temperature is about 400 ℃. Compared with example 3, the content of mica is increased by 10%, the puncture strength of the aramid mica paper is improved by 0.17%, and the tensile index and the interlayer bonding strength are respectively reduced by 4.83% and 4.82%.
Example 5
The invention relates to a preparation method of corona-resistant aramid/mica insulation paper, which comprises the following steps,
step 1, the use concentration is 1.2X 10-3And (3) washing the meta-aramid chopped fibers for 90min by using a mol/L sodium dodecyl benzene sulfonate solution at the temperature of 60 ℃, and then washing and drying the meta-aramid chopped fibers for later use. And (3) pulping the meta-aramid fibrid by a pulping machine (PFI), and sealing for later use.
And 2, defibering 0.25g of meta-aramid chopped fibers in 2L of water for 20000 turns, adding a polyethylene oxide dispersant (PEO) accounting for 0.9 percent of the total mass of the white mica sheets, the aramid chopped fibers and the aramid fibrids during defibering, adding 0.59g of meta-aramid fibrids, and defibering the meta-aramid fibrids and the aramid chopped fibers together for 6000 turns. Then adding a white mica sheet (the mass of the white mica sheet is 70 percent of the total mass of the white mica sheet, the aramid chopped fiber and the aramid precipitated fiber), mixing and defibering for 3000 turns to form uniformly dispersed mixed slurry.
And 3, adding 3.5L of water into a pulp storage chamber of the paper sheet former, and then pouring 2L of mixed pulp into the pulp storage chamber to form 0.06% pulp. Homogenizing for 9 times by stirring with homogenizing roller, dewatering and shaping the pulp with 200mm diameter and 200 mesh forming net under vacuum suction, and vacuum sucking for 6s after the water filtration of pulp is finished.
And 4, squeezing the formed aramid fiber mica paper under the pressure of 0.4MPa for 5min, and drying in a paper sheet dryer for 8 min.
And 5, hot-pressing the aramid mica paper by using a flat vulcanizing machine, wherein the hot-pressing temperature is 120 ℃, the pressure is 10MPa, and the time is 10min, so that the corona-resistant aramid/mica insulating paper is obtained.
FIG. 6 and FIG. 27. Fig. 8 and 9 are graphs of tensile index, interlayer bonding strength, breakdown strength, and thermogravimetry, respectively, of aramid mica paper having a mica content of 70%. The tensile index, the interlayer bonding strength and the breakdown strength of the aramid fiber mica paper containing 70 percent of mica respectively reach 7.75 N.m/g and 110.44J/m29.06kV/mm, and the thermal decomposition temperature is about 400 ℃. Compared with example 4, the content of mica is increased by 10%, the puncture strength of the aramid mica paper is improved by 3.97%, and the tensile index and the interlayer bonding strength are respectively reduced by 14.03% and 7.77%.
Table 1 shows the performance parameters of the aramid/mica insulation papers obtained in examples 1 to 5.
TABLE 1 Property parameters of aramid/mica insulation papers of different mica contents
Figure BDA0003418098290000121

Claims (10)

1. A preparation method of corona-resistant aramid/mica insulation paper is characterized by comprising the following steps;
step 1, firstly defibering aramid chopped fibers, polyoxyethylene and water, and then adding aramid fibrids for defibering to obtain first slurry;
step 2, adding a white mica sheet into the first slurry for defibering to obtain a second slurry, wherein the total mass of the aramid chopped fibers, the aramid fibrids and the white mica sheet in the second slurry accounts for 0.04-0.07 percent;
and 3, sequentially carrying out dehydration forming, squeezing, drying and hot pressing on the second sizing agent to obtain the aramid fiber/mica insulation paper.
2. The preparation method of the corona-resistant aramid/mica insulation paper as claimed in claim 1, wherein the proportion of the total mass of the aramid chopped fibers, the aramid fibrids and the muscovite flakes to water in step 1 is 2.83 g: 2L, the mass ratio of the aramid chopped fibers to the aramid fibrids is 3: 7.
3. the preparation method of the corona-resistant aramid/mica corona-resistant insulating paper as claimed in claim 1, wherein the mass of the muscovite flake in step 1 is 30% -70% of the total mass of the muscovite flake, the aramid chopped fiber and the aramid fibrid.
4. The preparation method of the corona-resistant aramid/mica insulation paper as claimed in claim 1, wherein the aramid chopped fiber in the step 1 is meta-aramid chopped fiber cleaned by sodium dodecyl benzene sulfonate solution, the aramid fibrid is meta-aramid fibrid treated by pulping, the meta-aramid chopped fiber is firstly defibrated in water by 10000-;
and 2, adding white mica sheets into the first slurry, and then defibering for 2500-.
5. The preparation method of the corona-resistant aramid/mica insulation paper as claimed in claim 1, wherein the addition amount of the polyethylene oxide in the step 1 is 0.1-0.9% of the total mass of the white mica sheet, the aramid chopped fiber and the aramid fibrid.
6. The preparation method of the corona-resistant aramid/mica insulation paper as claimed in claim 1, wherein step 1 is to add a polyoxyethylene aqueous solution with a concentration of 0.5706g/l and aramid chopped fibers into water for defibering, and the volume ratio of the polyoxyethylene aqueous solution to the water is (1-9): 400.
7. The method for preparing corona-resistant aramid/mica insulation paper according to claim 1, wherein step 2 comprises adding water into the first slurry after the white mica sheets are defibered, homogenizing the mixture by using a homogenizing roller or a bubble method to obtain a second slurry, wherein the number of times of stirring up and down is 5-10 times when the homogenizing roller is used for homogenizing, and the time of homogenizing is 5-10s when the bubble method is used for homogenizing.
8. The method for preparing the corona-resistant aramid/mica insulation paper as claimed in claim 1, wherein the second slurry is dehydrated and formed on the forming wire under the action of vacuum suction in step 3, the suction is continued for 5-10s after the formation, and the pressing is carried out for 3-6min under the pressure of 0.2-0.6 MPa.
9. The preparation method of the corona-resistant aramid/mica insulation paper according to claim 8, wherein the step 3 is to dry the squeezed aramid/mica paper for 8-20min, and finally, the obtained aramid/mica paper is hot-pressed for 5-20min at 120 ℃ and 10-20 MPa.
10. A corona resistant aramid/mica insulation paper obtained by the process of making a corona resistant aramid/mica insulation paper of any one of claims 1 to 9.
CN202111554355.1A 2021-12-17 2021-12-17 Corona-resistant aramid/mica insulation paper and preparation method thereof Withdrawn CN114214867A (en)

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CN114717678A (en) * 2022-04-06 2022-07-08 赣州龙邦材料科技有限公司 Preparation method of spiral ribbon aramid fibrid for papermaking
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114717678A (en) * 2022-04-06 2022-07-08 赣州龙邦材料科技有限公司 Preparation method of spiral ribbon aramid fibrid for papermaking
CN114717678B (en) * 2022-04-06 2024-02-27 赣州龙邦材料科技有限公司 Preparation method of ribbon aramid fibrid for papermaking
CN114808548A (en) * 2022-05-18 2022-07-29 瑞安复合材料(深圳)有限公司 High partial discharge insulating material for new energy automobile oil-cooled motor and preparation method thereof
WO2024082973A1 (en) * 2022-10-20 2024-04-25 天蔚蓝电驱动科技(江苏)有限公司 Corona-resistant mica/aramid fiber composite material for new-energy vehicles and preparation method therefor
CN116949866A (en) * 2023-06-13 2023-10-27 陕西科技大学 Superfine asphalt-based carbon fiber wave absorbing paper and preparation process thereof
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