CN111945478A - Preparation method of plasma treatment modified aramid fiber nano mica insulation paper - Google Patents
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- CN111945478A CN111945478A CN202010795550.2A CN202010795550A CN111945478A CN 111945478 A CN111945478 A CN 111945478A CN 202010795550 A CN202010795550 A CN 202010795550A CN 111945478 A CN111945478 A CN 111945478A
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- 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
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- D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
- D06M10/02—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements ultrasonic or sonic; Corona discharge
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- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
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- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
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- D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
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- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/34—Polyamides
- D06M2101/36—Aromatic polyamides
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Abstract
The invention discloses a preparation method of aramid fiber nano mica insulation paper modified by plasma treatment, belonging to the technical fields of pulping and papermaking, high polymer materials and electric insulation materials. According to the invention, the aramid fiber and the nano mica powder are treated by the plasma, so that the surface properties of the aramid fiber and the nano mica powder treated by the plasma are changed, the aramid fiber and the mica are more easily dispersed and combined, the preparation of the aramid fiber and nano mica mutually-wrapped mixed liquid is prepared, and the limitation of weak bonding strength of a mica interface and an aramid fiber interface is broken through, so that the high-performance aramid fiber and nano mica insulating paper with high temperature resistance, corona resistance, mechanical strength and electrical strength is obtained. The preparation of the high-performance aramid fiber nano mica insulation paper plays an important role in the development of the national key industry, and has an important significance in breaking the monopoly of foreign aramid fiber mica insulation paper.
Description
Technical Field
The invention relates to a preparation method and technology of aramid fiber nano mica insulation paper modified by plasma treatment, belonging to the technical field of pulping and papermaking and electrical insulation materials.
Background
The high-performance aramid mica insulating paper is mainly used as a high-end electric insulating material for high-voltage/variable-frequency motors, traction motors and the like, and the main raw materials of the high-performance aramid mica insulating paper comprise aramid fibers and mica powder. The large-scale generator sets, the high-voltage motors and the tractors are mainly applied to the aerospace industry, the national defense industry, the automobile industry and the like, play an important role in the development of the national key industry, and meanwhile, the preparation of the domestic aramid nano mica insulation paper has an important significance in breaking the monopoly of the foreign aramid mica insulation paper.
Aramid fiber is a novel high-tech chemical synthetic fiber, and has the excellent performances of ultrahigh strength, high modulus, high temperature resistance, acid and alkali resistance, light weight, insulation, ageing resistance, long life cycle and the like. The aramid fiber is mainly divided into three types of ortho-position, meta-position and para-position. According to the existing data research, the ortho-aramid has no commercial value, and the ortho-aramid and the meta-aramid have higher commercial value. Currently, the aramid fiber 1313 (poly m-phenylene isophthalamide fiber) and the aramid fiber 1414 (poly p-phenylene terephthalamide fiber) have been industrialized, and the aramid fiber 1313 has forms of chopped fiber, fibrid, pulp, and the like. Manufacturers of aramid mica paper include Dupont, Teijin, Japan, and Acordis, Germany.
Mica is a nonmetallic mineral, the main component of which is hydrous aluminosilicate, such as phlogopite, muscovite, synthetic mica and the like, wherein, the muscovite is most widely applied. The muscovite has excellent insulating property, high temperature resistance, transparency, waterproof property, chemical stability and the like.
Pure aramid paper and pure mica paper exist in the current market, and the pure aramid paper has high strength, good dielectric property and chemical stability, but poor corona resistance. The pure mica paper has good corona resistance, but needs glass cloth and adhesive for reinforcement, and the used mica powder has larger particles. However, the aramid mica paper has no finished product which is independently researched and developed at home, and only can be imported from foreign countries, and the domestic market is monopolized by DuPont. By combining the characteristics of the two raw materials, the aramid mica paper has high temperature resistance, corona resistance and excellent strength performance, and is a high-performance insulating material. However, the prior patents on aramid mica insulation paper still meet the requirements of high-end fields due to the limitation of mica particle size and the limitation of interface bonding of mica and aramid.
Disclosure of Invention
The invention mainly aims to provide a preparation method of the aramid fiber nano mica insulation paper modified by plasma treatment, and the high-performance aramid fiber nano mica insulation paper produced by the method has the characteristics of high temperature resistance, corona resistance, high mechanical strength, high electrical strength and the like. After plasma treatment, polar functional groups of-COOH, -OCH and-OH are introduced into the surface of the aramid fiber, so that the surface composition of the material is changed, the hydrophilicity of the surface of the aramid fiber is improved, and meanwhile, as the-COOH, -OCH and-OH are not grafted to introduce permanent hydrophilic functional groups, the aramid fiber has temporary hydrophilicity and does not influence the electrical strength after paper forming. The use of the nano mica powder greatly reduces the sedimentation speed and is beneficial to dispersion. After the nano mica powder is subjected to plasma treatment, the specific surface is increased due to particle impact, the uniform dispersibility of mica powder particles is further improved, and the nano mica particles are wrapped on the aramid fiber surface. The problem that the aramid fiber mica is difficult to disperse and the problem of interface combination of the organic aramid fiber and the inorganic mica particles are well solved, so that the high-performance aramid fiber nano mica paper is prepared.
In order to achieve the above purpose, the present invention mainly adopts the following steps.
Firstly, preparing modified aramid fiber A: washing aramid fibers with warm water to obtain an aramid fiber raw material; then processing the aramid fiber raw material in a plasma device to obtain modified aramid fiber A, wherein the processing conditions of the plasma device are as follows: the power is 400-800W, the air pressure is 1200-1700 kPa, the time is 2-10 min, and the air atmosphere or the pure oxygen atmosphere is adopted; the treated fibers were stored hermetically and used within a week.
The aramid fiber is one or a mixture of poly (p-phenylene terephthalamide) fiber and poly (m-phenylene terephthalamide) fiber, the mass ratio of the poly (p-phenylene terephthalamide) fiber to the poly (m-phenylene terephthalamide) fiber is 0-1: 1, the length of the fiber is 0.01-8 mm, the temperature of washing warm water is 30-100 ℃, and the washing time is 10-60 min.
The discharge mode of the plasma device in the first step is subatmospheric glow or radio frequency low-temperature plasma device.
Secondly, preparing nano mica powder: firstly, sieving muscovite and phlogopite to remove impurities, then mixing the mica powder with the impurities, grinding protection liquid and water according to a certain proportion to prepare mica suspension B, and then putting the mica suspension B into a colloid grinder to grind to obtain nano mica grinding liquid C. And then adding the acid solution into the mica grinding fluid C, adjusting the pH value to 3-4, stirring at a rotating speed of 200-500 r/min for a certain time, standing for 8-15 min, filtering to obtain a nano mica precipitate D, and then carrying out airflow crushing on the nano mica precipitate D after high-temperature drying to obtain nano mica powder E. And finally, treating the nano mica powder E in a plasma device to obtain nano mica powder F, wherein the treatment conditions of the plasma device are as follows: the power is 500-800W, the air pressure is 1300-1800 kPa, the time is 1-6 min, and the air atmosphere or the pure oxygen atmosphere is adopted; the nano mica powder F is stored in a sealed mode and used within one week.
The nano mica powder is one or a mixture of muscovite and phlogopite, the particle size of the mica powder is 40-100 meshes, and the mass ratio of the two mixed materials is 1-6: 0-2.
And in the second step, the grinding protection liquid is one or a mixture of silicone oil and glycerol, and the mixing mass ratio is 1: 1-4.
And secondly, the mass ratio of the mica powder to the grinding protection liquid to the water is 200: 1-3: 300-600, and the grinding time is 5-25 min.
And secondly, the acid solution is dilute hydrochloric acid or sulfuric acid, and the stirring time is controlled to be 5-25 min.
And secondly, drying the nano mica precipitate D at the temperature of 80-105 ℃, and performing nano airflow crushing to obtain high-purity and high-homogeneity nano mica powder E.
The discharge mode of the plasma device in the second place is a subatmospheric glow or radio frequency low-temperature plasma device.
Thirdly, preparing high-performance aramid fiber nano mica insulation paper: the modified aramid fiber A, the nano mica powder F and water are mixed in proportion, the mixture is dispersed at a high speed to prepare an aramid fiber nano mica powder suspension D, and then the mixed suspension D is formed by a paper making machine to prepare the high-performance aramid fiber cloud nano mother insulation wet paper. And drying the high-performance aramid fiber nano mica insulation wet paper to obtain the high-performance aramid fiber nano mica insulation base paper. And finally, carrying out hot pressing on the prepared high-performance aramid fiber nano mica insulation base paper, optimizing the performance of the high-performance aramid fiber nano mica insulation base paper, and preparing the high-performance aramid fiber nano mica insulation paper.
And thirdly, the mass ratio of the aramid fiber A, the nano mica powder F and the water is 0.5-3 g:500 ml. The rotating speed is 50-200 r/min, and the stirring time is 2-15 min.
And thirdly, drying the wet paper web at the temperature of 95-105 ℃.
And thirdly, the hot press is a double-steel-roller hot press, the hot pressing temperature is 220-265 ℃, and the hot pressing pressure is 15-25 MPa.
The high-performance aramid fiber nano mica insulation paper prepared by the invention breaks through the limitation of weak bonding strength between a mica interface and an aramid fiber interface mainly through the preparation of nano mica powder and the treatment of plasma, and the mixed liquid of nano mica particles and aramid fiber which are mutually wrapped is prepared, so that the high-performance aramid fiber nano mica insulation paper with high temperature resistance, corona resistance, mechanical strength and electrical strength is obtained. However, the large-particle mica powder used in the existing research cannot be effectively combined with aramid fiber, so that the high strength and the high electrical performance of the aramid mica insulation paper are influenced.
Drawings
FIG. 1 is a process flow chart of a preparation method of the plasma treatment modified aramid fiber nano mica insulation paper of the invention.
Detailed Description
For a better understanding of the present invention, the following examples are included to further illustrate the invention, but the scope of the invention is not limited thereto.
Example 1.
A preparation method of plasma treatment modified aramid fiber nano mica insulation paper comprises the following steps.
(1) The aramid fiber is prepared by selecting poly (m-phenyleneterephthalamide) fiber with the fiber length of 0.5-2 mm, and then washing with warm water at the temperature of 60 ℃ for 20 min.
(2) Processing an aramid fiber raw material in a sub-atmospheric pressure glow discharge plasma device to obtain modified aramid fiber A, wherein the processing power is 600W, the air pressure is 1500kPa, the time is 3min, selecting an air atmosphere, and sealing for later use after processing.
(3) The mica powder is muscovite, and the particle size range of the muscovite is 50-70 meshes; the grinding protection liquid is prepared from silicone oil and glycerol in a mixing mass ratio of 1: 0.
(4) And (2) mixing the mica powder, the grinding protection solution and water in a mass ratio of 200:2:500, and grinding the mixture in a colloid grinder for 10min to obtain the nano mica grinding solution C.
(5) And adding hydrochloric acid into the nano mica grinding liquid C, adjusting the pH value to 3-4, stirring at a rotating speed of 200r/min for 10min, standing for 8min, filtering to obtain a nano mica precipitate D, and performing airflow crushing on the nano mica precipitate D dried at a high temperature of 105 ℃ to obtain high-purity and high-homogeneity nano mica powder E.
(6) Placing the nano mica powder E in a sub-atmospheric pressure glow discharge plasma device for processing to obtain nano mica powder F, wherein the processing conditions of the plasma device are as follows: the power is 600W, the air pressure is 1600kPa, the time is 3min, and the atmosphere is air; and sealing for later use after treatment.
(7) And mixing the modified aramid fiber A, the nano mica powder F and water according to a mass ratio of 3g to 500ml, wherein the rotating speed is 100r/min, and the stirring time is 5min to prepare an aramid fiber nano mica powder suspension D.
(8) And forming the mixed suspension D by a paper making machine to prepare the high-performance aramid fiber cloud nano-mother insulation wet paper.
(9) Drying the high-performance aramid fiber nano mica insulation wet paper to obtain the high-performance aramid fiber nano mica insulation base paper, wherein the drying temperature is 105 ℃.
(10) And (3) carrying out hot pressing on the prepared high-performance aramid fiber nano mica insulation base paper by using a double-steel-roller hot press, wherein the hot pressing temperature is 240 ℃, and the hot pressing pressure is 20MPa, so that the high-performance aramid fiber nano mica insulation paper is prepared.
Example 2.
A preparation method of plasma treatment modified aramid fiber nano mica insulation paper comprises the following steps.
(1) The aramid fiber is prepared by selecting poly (m-phenyleneterephthalamide) fiber with the fiber length of 1-3 mm, and then washing with warm water at the temperature of 70 ℃ for 25 min.
(2) Processing an aramid fiber raw material in a sub-atmospheric pressure glow discharge plasma device to obtain modified aramid fiber A, wherein the processing power is 700W, the air pressure is 1600kPa, the time is 5min, selecting an air atmosphere, and sealing for later use after processing.
(3) The mica powder is muscovite and phlogopite, the mixing mass ratio of the muscovite and the phlogopite is 2:1, and the particle size range of the muscovite and phlogopite is 60-100 meshes; the grinding protection liquid is prepared from silicone oil and glycerin according to a mixing mass ratio of 4: 1.
(4) And (2) mixing the mica powder, the grinding protection solution and water in a mass ratio of 200:3:600, and grinding the mixture in a colloid grinder for 20min to obtain the nano mica grinding solution C.
(5) And adding hydrochloric acid into the nano mica grinding liquid C, adjusting the pH value to 3-4, stirring at the rotating speed of 300r/min for 20min, standing for 12min, filtering to obtain a nano mica precipitate D, and performing airflow crushing on the nano mica precipitate D dried at the high temperature of 100 ℃ to obtain high-purity and high-homogeneity nano mica powder E.
(6) Placing the nano mica powder E in a sub-atmospheric pressure glow discharge plasma device for processing to obtain nano mica powder F, wherein the processing conditions of the plasma device are as follows: the power is 500W, the air pressure is 1700kPa, the time is 1min, and the atmosphere is air; and sealing for later use after treatment.
(7) And mixing the modified aramid fiber A, the nano mica powder F and water according to a mass ratio of 2g to 500ml, wherein the rotating speed is 80r/min, and the stirring time is 10min to prepare an aramid fiber nano mica powder suspension D.
(8) And forming the mixed suspension D by a paper making machine to prepare the high-performance aramid fiber cloud nano-mother insulation wet paper.
(9) Drying the high-performance aramid fiber nano mica insulation wet paper to obtain the high-performance aramid fiber nano mica insulation base paper, wherein the drying temperature is 105 ℃.
(10) And (3) carrying out hot pressing on the prepared high-performance aramid fiber nano mica insulation base paper by using a double-steel-roller hot press, wherein the hot pressing temperature is 245 ℃, and the hot pressing pressure is 18MPa, so that the high-performance aramid fiber nano mica insulation paper is prepared.
Example 3.
A preparation method of plasma treatment modified aramid fiber nano mica insulation paper comprises the following steps.
(1) The aramid fiber is prepared by selecting poly (m-phenyleneterephthalamide) fiber with the fiber length of 1-5 mm, and then washing with warm water at the temperature of 50 ℃ for 50 min.
(2) Processing an aramid fiber raw material in a sub-atmospheric pressure glow discharge plasma device to obtain modified aramid fiber A, wherein the processing power is 500W, the air pressure is 1200kPa, the time is 4min, selecting an oxygen atmosphere, and sealing for later use after processing.
(3) The mica powder is muscovite and phlogopite, the mixing mass ratio of the muscovite and the phlogopite is 4:1, and the particle size range of the muscovite and the phlogopite is 40-80 meshes; the grinding protection liquid is prepared from silicone oil and glycerin according to a mixing mass ratio of 4: 1.
(4) And (2) mixing the mica powder, the grinding protection solution and water in a mass ratio of 200:1:500, and grinding the mixture in a colloid grinder for 15min to obtain the nano mica grinding solution C.
(5) And adding hydrochloric acid into the nano mica grinding liquid C, adjusting the pH value to 3-4, stirring at the rotating speed of 500r/min for 18min, standing for 15min, filtering to obtain a nano mica precipitate D, and performing airflow crushing on the nano mica precipitate D dried at the high temperature of 105 ℃ to obtain high-purity and high-homogeneity nano mica powder E.
(6) Placing the nano mica powder E in a sub-atmospheric pressure glow discharge plasma device for processing to obtain nano mica powder F, wherein the processing conditions of the plasma device are as follows: the power is 800W, the air pressure is 1300kPa, the time is 5min, and the atmosphere is air; and sealing for later use after treatment.
(7) And mixing the modified aramid fiber A, the nano mica powder F and water according to a mass ratio of 1g to 500ml, wherein the rotating speed is 150r/min, and the stirring time is 15min, so as to prepare the aramid fiber nano mica powder suspension D.
(8) And forming the mixed suspension D by a paper making machine to prepare the high-performance aramid fiber cloud nano-mother insulation wet paper.
(9) Drying the high-performance aramid fiber nano mica insulation wet paper to obtain the high-performance aramid fiber nano mica insulation base paper, wherein the drying temperature is 105 ℃.
(10) And (3) carrying out hot pressing on the prepared high-performance aramid fiber nano mica insulation base paper by using a double-steel-roller hot press, wherein the hot pressing temperature is 260 ℃, and the hot pressing pressure is 22MPa, so that the high-performance aramid fiber nano mica insulation paper is prepared.
The samples of examples 1, 2, 3 and the foreign samples were compared and analyzed for their properties, see table 1.
TABLE 1 Properties of aramid fiber nano mica insulation paper
| Sample (I) | Quantitative (g/m 2) | Thickness (mm) | Tensile Strength MD (kN/m) | Elongation (%) | Air permeability (mm. s)-1） | Shrinkage (%) | Breakdown voltage (KV mm)-1） | Heat resistance grade (. degree. C.) |
| Example 1 | 90.2 | 0.081 | 3.0 | 3.0% | 1.53 | ≤0.3% | 20.1 | ≥220℃ |
| Example 2 | 90.3 | 0.079 | 3.1 | 3.1% | 1.55 | ≤0.3% | 20.0 | ≥220℃ |
| Example 3 | 89.9 | 0.082 | 2.9 | 3.2% | 1.58 | ≤0.3% | 21.1 | ≥220℃ |
| Import sample | 89.9 | 0.081 | 2.4 | 3.1% | 1.55 | ≤0.3% | 20.0 | ≥220℃ |
The data in table 1 show that the strength, air permeability, electrical properties and heat resistance of the aramid mica paper in examples 1, 2 and 3 can reach the foreign import level under the condition that the weight and thickness of the aramid mica paper are similar.
The above-described embodiments are intended to be illustrative, but not limiting, of the present invention, and it will be understood that various modifications and alternative methods may be made without departing from the spirit of the invention.
Claims (12)
1. A preparation method of aramid fiber nano mica insulation paper modified by plasma treatment is characterized by comprising the following steps:
(1) washing aramid fiber with warm water, drying to obtain an aramid fiber raw material, and then treating the aramid fiber raw material in a sub-atmospheric pressure glow discharge plasma device to obtain modified aramid fiber A, wherein the treatment conditions of the plasma device are as follows: the power is 400-800W, the air pressure is 1200-1700 kPa, the time is 2-10 min, and the air atmosphere or the pure oxygen atmosphere is adopted; the treated fibers are stored in a sealed mode and used within one week;
(2) mixing the impurity-removed mica powder, grinding protection liquid and water in a certain proportion to prepare mica suspension B, and then putting the mica suspension B into a colloid grinder for grinding to obtain nano mica grinding liquid C;
(3) adding the acid solution into the mica grinding fluid C, adjusting the pH value to 3-4, stirring at a rotating speed of 200-500 r/min for a certain time, standing for 8-15 min, filtering to obtain a nano mica precipitate D, and then carrying out airflow crushing on the nano mica precipitate D after high-temperature drying to obtain nano mica powder E;
(4) placing the nano mica powder E in a sub-atmospheric pressure glow discharge plasma device for processing to obtain nano mica powder F, wherein the processing conditions of the plasma device are as follows: the power is 500-800W, the air pressure is 1300-1800 kPa, the time is 1-6 min, and the air atmosphere or the pure oxygen atmosphere is adopted; the nano mica powder F is stored in a sealed way and is used within one week;
(5) mixing the modified aramid fiber A, the nano mica powder F and water in proportion, and preparing an aramid fiber nano mica powder suspension D through high-speed dispersion, wherein the suspension forms a nano mica particle-coated aramid fiber shape;
(6) molding the mixed aramid fiber nano mica powder suspension D by a paper making machine, and finally preparing a high-performance aramid fiber nano mica insulation wet paper sheet;
(7) drying the high-performance aramid fiber nano mica insulation wet paper to obtain high-performance aramid fiber nano mica insulation base paper;
(8) and carrying out hot pressing on the prepared high-performance aramid fiber nano mica insulation base paper, optimizing the performance of the high-performance aramid fiber nano mica insulation base paper, and preparing the high-performance aramid fiber nano mica insulation paper.
2. The preparation method of the plasma-treated and modified aramid fiber nano mica insulation paper according to claim 1, wherein the aramid fiber in the step (1) is one or a mixture of poly (p-phenylene terephthalamide) fiber and poly (m-phenylene terephthalamide) fiber, the length of the aramid fiber is 0.01-8 mm, the temperature of washing warm water is 30-100 ℃, and the washing time is 10-60 min.
3. The preparation method of the plasma-treated modified aramid fiber nano mica insulation paper according to claim 1, wherein the plasma device in the step (1) is a subatmospheric glow or radio frequency low-temperature plasma device.
4. The preparation method of the plasma-treated and modified aramid fiber nano mica insulation paper according to claim 1, wherein in the step (2), mica powder is one or a mixture of muscovite and phlogopite, the particle size of the mica powder is 40-100 meshes, and the mass ratio of the mica powder to the phlogopite is 1-6: 0-2.
5. The preparation method of the plasma-treated modified aramid fiber nano mica insulation paper according to claim 1, wherein the grinding protection liquid in the step (2) is one or a mixture of silicone oil and glycerol, and the mixing mass ratio is 1: 1-4.
6. The preparation method of the plasma-treated and modified aramid fiber nano mica insulation paper according to claim 1, wherein in the step (2), the mass ratio of the mica powder to the grinding protection liquid to water is 200: 1-3: 300-600, and the grinding time is 5-25 min.
7. The preparation method of the plasma-treated modified aramid nano mica insulation paper according to claim 1, wherein the acidic solution in the step (3) is dilute hydrochloric acid or sulfuric acid, and the stirring time is controlled within 10-25 min.
8. The preparation method of the plasma-treated and modified aramid fiber nano mica insulation paper as claimed in claim 1, wherein the drying temperature of the dried nano mica precipitate D in the step (3) is in the range of 80 ℃ to 105 ℃, and the nano mica powder E with high purity and high homogeneity is obtained after the nano gas flow crushing.
9. The preparation method of the plasma-treated modified aramid fiber nano mica insulation paper according to claim 1, wherein the plasma device in the step (4) is a subatmospheric glow or radio frequency low-temperature plasma device.
10. The preparation method of the plasma-treated and modified aramid fiber nano mica insulation paper according to claim 1, wherein in the step (5), the mass ratio of the aramid fiber A to the nano mica powder F to the water is 0.5-3 g:500ml, the rotating speed is 50-200 r/min, and the stirring time is 2-15 min.
11. The preparation method of the plasma-treated modified aramid mica insulation paper as claimed in claim 1, wherein the drying temperature of the wet paper web in the step (9) is 95 ℃ to 105 ℃.
12. The preparation method of the plasma-treated modified aramid mica insulation paper according to claim 1, wherein the hot press used in the step (10) is a double-steel-roll hot press, the hot pressing temperature is 220-265 ℃, and the hot pressing pressure is 15-25 MPa.
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| CN113089383A (en) * | 2021-04-01 | 2021-07-09 | 陕西科技大学 | Aramid fiber and mica nanometer insulating paper and preparation method thereof |
| CN113860780A (en) * | 2021-11-04 | 2021-12-31 | 福州大学 | Preparation method of high-activity spherical calcined coal gangue powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113089383A (en) * | 2021-04-01 | 2021-07-09 | 陕西科技大学 | Aramid fiber and mica nanometer insulating paper and preparation method thereof |
| CN113089383B (en) * | 2021-04-01 | 2022-12-06 | 陕西科技大学 | Aramid fiber and mica nanometer insulating paper and preparation method thereof |
| CN113963842A (en) * | 2021-10-13 | 2022-01-21 | 瑞安复合材料(深圳)有限公司 | High partial discharge insulating material for oil-cooled motor and preparation method thereof |
| CN114318938A (en) * | 2021-10-29 | 2022-04-12 | 通城县云水云母科技有限公司 | High-thermal-conductivity aramid fiber mica paper and manufacturing method thereof |
| CN113860780A (en) * | 2021-11-04 | 2021-12-31 | 福州大学 | Preparation method of high-activity spherical calcined coal gangue powder |
| CN116892129A (en) * | 2023-09-11 | 2023-10-17 | 四川大学 | Corona-resistant N-level insulating paper for variable frequency motor and preparation method thereof |
| CN116892129B (en) * | 2023-09-11 | 2023-11-14 | 四川大学 | Corona-resistant N-level insulating paper for variable frequency motor and preparation method thereof |
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