CN111926612B - Preparation method of high-performance aramid fiber nano mica insulation paper - Google Patents
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- D—TEXTILES; PAPER
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Abstract
The invention discloses a preparation method of high-performance aramid fiber nano mica insulation paper, and belongs to the technical fields of pulping and papermaking, high polymer materials and electric insulation materials. The invention mainly comprises the following steps: 1. preparing high-homogeneity nano mica powder; 2. preparing aramid transparent dispersion liquid M; 3. preparing a mixed solution G in which aramid fiber and nano mica are mutually wrapped; 4. preparing aramid fiber nano mica mixed suspension F; 5. preparing aramid fiber nano mica insulation base paper; 6. and (4) performing hot pressing to optimize the aramid fiber nano mica insulation paper. The key point is the preparation of the mixed liquid of the mutually wrapped high-homogeneity nano mica powder and the aramid fiber nano mica, the limitation of weak bonding strength of a mica interface and an aramid fiber interface is broken through, and the high-performance aramid fiber nano mica insulation paper with high temperature resistance, corona resistance, high mechanical strength and high electrical strength is prepared. 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 high-performance aramid fiber nano mica insulation paper, and belongs to the technical fields of pulping and papermaking, high polymer materials and electric 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 set, the high-voltage motor and the tractor 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 national key industries, and have important significance in breaking monopoly of foreign aramid fiber and mica insulation paper.
Aramid fiber is phenylene terephthalamide, 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. At present, the aramid fiber 1313 (poly (m-phenylene isophthalamide) fiber) and the aramid fiber 1414 (poly (p-phenylene terephthalamide) fiber) are industrialized, and meanwhile, the aramid fiber has forms of chopped fiber, fibrid, pulp, nano aramid fiber 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 market at present, 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 existing research and patents on aramid mica insulation paper still do not 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 high-performance aramid fiber nano mica insulation paper, 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, the problem of interface bonding between organic aramid fiber and inorganic mica particles is solved by preparing an aramid fiber nano mica mutual wrapping mixed solution, and the problems of sedimentation speed and retention rate of mica powder are greatly reduced.
In order to achieve the purpose, the invention mainly adopts the following steps:
firstly, preparing an aramid transparent dispersion liquid M: washing aramid fibers with warm water to obtain an aramid fiber raw material; placing aramid fiber, a catalyst and a dimethylacetamide solvent in a container, placing the container in a water bath, and mechanically stirring at a low speed to prepare the stable aramid fiber transparent dispersion liquid M.
In the first step, the aramid fiber is one or a mixture of poly (p-phenylene terephthalamide) fiber and poly (m-phenylene terephthalamide) fiber, and the mixing mass ratio is 0-1: 1 the length of the fiber is 0.01-8 mm, the temperature of the washing warm water is 30-80 ℃, and the washing time is 20-50 min.
In the first step, the catalyst is calcium chloride (CaCl)2) Or potassium chloride (KCl)2) Or the two are mixed in a mass ratio of 1: 1-2.
In the first step, the mass ratio of the methylacetamide solvent to the catalyst to the aramid fiber is 80-200: 1-2: 50, the water bath temperature is 40-90 ℃, and the mechanical stirring speed is 50-100 r/min.
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.
The nano mica powder is one or a mixture of muscovite and phlogopite, the particle size of the mica powder is 40-80 meshes, and the mass ratio of the two mixed materials is 2-5: 0-1.
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: 1-5.
And secondly, the mass ratio of the mica powder to the grinding protection liquid to the water is 200: 1-2: 400-500, and the grinding time is 5-20 min.
And secondly, the acid solution is dilute hydrochloric acid or sulfuric acid, and the stirring time is controlled to be 5-20 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.
Thirdly, preparing aramid fiber nano mica particle mutual wrapping suspension liquid: and continuously adding the nano mica powder E into the aramid transparent dispersion liquid M, and still stirring at a low speed in the adding process to prepare the aramid nano mica mixed liquid H. Then adding a certain amount of ethanol into the aramid fiber nano mica powder mixed solution H, and continuously stirring at a low speed to separate out aramid fiber in the aramid fiber stock solution to form an aramid fiber nano mica powder mutually-wrapped mixed solution G.
And thirdly, the mass ratio of the nano mica powder E to the aramid transparent dispersion liquid M is 1: 5-10, and the stirring speed is 40-80 r/min.
And thirdly, the mass ratio of the ethanol to the aramid fiber nano mica powder mixed solution H is 1: 3-10, and the stirring speed is 40-80 r/min.
Fourthly, preparing aramid fiber suspension I: the aramid chopped fiber, the aramid fibrid and water are mixed according to the proportion of 0.5-1.5 g: 0.5g to 1.5 g: 500ml, and is dispersed at high speed to prepare aramid fiber suspension I.
Fifthly, preparing the high-performance aramid fiber nano mica insulation paper: firstly, fully mixing the prepared aramid fiber coated nano mica powder mixed solution G and the aramid fiber mixed solution I under low-speed stirring to prepare an aramid fiber nano mica mixed suspension F. And then forming the mixed suspension F through a paper making machine, washing the formed mixed suspension F for multiple times through a mixed solution of water and ethanol, and finally preparing 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 fifthly, the stirring speed of the aramid fiber coated nano mica powder mixed solution G and the aramid fiber mixed solution I during mixing is 50-100 r/min.
And fifthly, the ratio of the ethanol to the water is 1: 5-10, and the washing times are 2-5.
And fifthly, the drying temperature of the wet paper web is 95-105 ℃.
And fifthly, 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.
According to the high-performance aramid fiber nano mica insulation paper prepared by the invention, the limit of weak bonding strength between a mica interface and an aramid fiber interface is broken through mainly preparing the mixed liquid of nano mica particles and aramid fiber, and large-particle mica powder used in the existing research cannot be effectively bonded with aramid fiber, so that the high strength and high electrical performance of the aramid fiber mica insulation paper are influenced. The homogeneous nano mica powder obtained by jet milling can form a mutual wrapping state with the separated aramid fiber, so that the high strength and the high electrical performance of the nylon mica insulation paper can be better enhanced.
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FIG. 1 is a process flow chart of a preparation method of the high-performance aramid nano mica insulation paper disclosed by 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 high-performance aramid fiber nano mica insulation paper comprises the following steps:
(1) selecting poly (m-phenyleneterephthalamide) fibers as aramid fibers, wherein the length of the fibers is 1-3 mm, and then washing with warm water at the temperature of 40 ℃ for 30 min; selecting calcium chloride (CaCl 2) as a catalyst; the dimethylacetamide solvent is selected as an analytical pure reagent.
(2) Selecting a dimethylacetamide solvent, a catalyst and aramid fiber in a mass ratio of 500 ml: 0.1 g: 4g of the aramid fiber is blended in proportion and placed in a container, the container is placed at the temperature of 50 ℃ for constant temperature treatment, and continuous stirring is carried out at the mechanical stirring speed of 60r/min, so that the stable aramid fiber transparent dispersion liquid M is finally obtained.
(3) The mica powder is muscovite, and the particle size range of the muscovite is 60-80 meshes; the grinding protection liquid is prepared from silicone oil and glycerol in a mixing mass ratio of 1: 1;
(4) and (2) mixing the mica powder, the grinding protection solution and water in a mass ratio of 200:1:400, 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 300r/min for 10min, standing for 15min, filtering to obtain a nano mica precipitate D, and performing jet milling on the nano mica precipitate D dried at the high temperature of 105 ℃ to obtain the high-purity and high-homogeneity nano mica powder E.
(6) Continuously adding the nano mica powder E into the aramid fiber transparent dispersion liquid M, wherein the mass ratio of the nano mica powder E to the aramid fiber transparent dispersion liquid M is 1:8, and stirring at a low speed of 60r/min in the adding process to prepare an aramid fiber nano mica mixed liquid H.
(7) Adding a certain amount of ethanol into the aramid fiber nano-mica powder mixed solution H, wherein the mass ratio of the ethanol to the aramid fiber nano-mica powder mixed solution H is 1:5, and continuously stirring at a low speed of 50 r/min to separate out the aramid fiber in the aramid fiber stock solution to form an aramid fiber nano-mica powder mutual wrapping mixed solution G.
(8) Mixing aramid chopped fibers, aramid fibrids and water in a ratio of 1 g: 1 g: the proportion of 500 ml.
The aramid fiber suspension I is prepared by high-speed dispersion, and the dispersion speed is 500 r/min.
(9) And (3) fully mixing the prepared aramid fiber nano mica powder mutually-wrapped mixed solution G and the aramid fiber mixed solution I under low-speed stirring at the mechanical stirring speed of 60r/min to prepare the aramid fiber nano mica mixed suspension F.
(10) And forming the mixed suspension F through a paper making machine, and washing for 3 times through a mixed solution of water and ethanol, wherein the ratio of ethanol to water is 1-10. Finally, the high-performance aramid fiber cloud nano-mother insulation wet paper sheet is prepared.
(11) 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 ℃.
(12) 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 high-performance aramid fiber nano mica insulation paper comprises the following steps:
(1) selecting poly (m-phenyleneterephthalamide) fibers as aramid fibers, wherein the fiber length is 0.5-4 mm, and then washing with warm water at the temperature of 50 ℃ for 20 min; the catalyst is selected from calcium chloride (CaCl)2) And potassium chloride (KCl)2) The mixing mass ratio is 1: 1; the dimethylacetamide solvent is selected as an analytical pure reagent.
(2) Selecting a dimethylacetamide solvent, a catalyst and aramid fiber in a mass ratio of 500 ml: 1.5 g: 5g of the aramid fiber transparent dispersion liquid is blended in proportion and placed in a container, the container is placed at the temperature of 55 ℃ for constant temperature treatment, and continuous stirring is carried out at the mechanical stirring speed of 70r/min, so that the stable aramid fiber transparent dispersion liquid M is finally obtained.
(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 the phlogopite is 40-60 meshes; the grinding protection liquid is prepared from silicone oil and glycerol in a mixing mass ratio of 1: 2;
(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 the rotating speed of 400r/min for 15min, standing for 10min, 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) Continuously adding the nano mica powder E into the aramid fiber transparent dispersion liquid M, wherein the mass ratio of the nano mica powder E to the aramid fiber transparent dispersion liquid M is 2:10, and stirring at a low speed of 50 r/min in the adding process to prepare an aramid fiber nano mica mixed liquid H.
(7) Adding a certain amount of ethanol into the aramid fiber nano mica powder mixed solution H, wherein the mass ratio of the ethanol to the aramid fiber nano mica powder mixed solution H is 1:8, and continuously stirring at a low speed of 70r/min to separate out aramid fiber in the aramid fiber stock solution to form an aramid fiber nano mica powder mutually-wrapped mixed solution G.
(8) Mixing aramid chopped fibers, aramid fibrids and water in a proportion of 1.5 g: 1.5 g: 500ml, and preparing the aramid fiber suspension I through high-speed dispersion, wherein the dispersion speed is 800 r/min.
(9) And fully mixing the prepared aramid fiber nano mica mutual wrapping mixed solution G and the aramid fiber mixed solution I under low-speed stirring at the mechanical stirring speed of 80r/min to prepare the aramid fiber nano mica mixed suspension F.
(10) And (3) forming the mixed suspension F through a paper making machine, and washing for multiple times through a mixed solution of water and ethanol, wherein the ratio of ethanol to water is 1:8, washing times 5 times. Finally, the high-performance aramid fiber cloud nano-mother insulation wet paper sheet is prepared.
(11) 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 100 ℃.
(12) 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 25MPa, so that the high-performance aramid fiber nano mica insulation paper is prepared.
Example 3:
a preparation method of high-performance aramid fiber nano mica insulation paper comprises the following steps:
(1) the aramid fiber is selected from poly-p-phenylene terephthamide fiber and poly-m-phenylene terephthamide fiber, the mass ratio of the poly-p-phenylene terephthamide fiber to the poly-m-phenylene terephthamide fiber is 1:1,the length of the fiber is 2-6 mm, and then warm water washing is carried out, wherein the temperature of the washing warm water is 70 ℃, and the washing time is 30 min; catalyst selection potassium chloride (KCl)2) (ii) a The dimethyl acetamide solvent selects analytically pure reagent.
(2) Selecting a dimethylacetamide solvent, a catalyst and aramid fiber in a mass ratio of 500 ml: 2 g: 8g of the aramid fiber transparent dispersion liquid is blended in proportion and placed in a container, the container is placed at the temperature of 60 ℃ for constant temperature treatment, and continuous stirring is carried out at the mechanical stirring speed of 80r/min, so that the stable aramid fiber transparent dispersion liquid M is finally obtained.
(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: 5;
(4) and (3) mixing the mica powder, the grinding protection solution and water in a mass ratio of 200:1:450, and grinding the mixture in a colloid grinder for 20min to obtain the nano mica grinding solution C.
(5) Adding sulfuric acid into the nano mica grinding liquid C, adjusting the pH value to 3-4, stirring at a rotating speed of 200r/min for 5min, 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 80 ℃ to obtain high-purity and high-homogeneity nano mica powder E.
(6) Continuously adding the nano mica powder E into the aramid transparent dispersion liquid M, wherein the mass ratio of the nano mica powder E to the aramid transparent dispersion liquid M is 3:5, and stirring at a low speed of 70r/min in the adding process to prepare the aramid nano mica mixed liquid H.
(7) Adding a certain amount of ethanol into the aramid fiber nano mica powder mixed solution H, wherein the mass ratio of the ethanol to the aramid fiber nano mica powder mixed solution H is 1:10, and continuously stirring at a low speed of 40 r/min to separate out aramid fiber in the aramid fiber stock solution to form an aramid fiber nano mica powder mutually-wrapped mixed solution G.
(8) Mixing aramid chopped fibers, aramid fibrids and water in a ratio of 1 g: 1.5 g: the proportion of 500 ml. The aramid fiber suspension I is prepared by high-speed dispersion, and the dispersion speed is 1000 r/min.
(9) And fully mixing the prepared aramid fiber coated nano mica powder mixed solution G and the aramid fiber mixed solution I under low-speed stirring at the mechanical stirring speed of 100r/min to prepare the aramid fiber nano mica mixed suspension F.
(10) And (3) forming the mixed suspension F through a paper making machine, and washing for multiple times through a mixed solution of water and ethanol, wherein the ratio of ethanol to water is 1:10, number of washes 2 times. Finally, the high-performance aramid fiber cloud nano-mother insulation wet paper sheet is prepared.
(11) 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 95 ℃.
(12) 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 220 ℃, and the hot pressing pressure is 15MPa, so that the high-performance aramid fiber nano mica insulation paper is prepared.
The samples of examples 1, 2, 3 were compared and analyzed for 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 | 90.3 | 0.080 | 3.2 | 2.9% | 1.50 | ≤0.3% | 20.2 | ≥220℃ |
| Example 2 | 90.0 | 0.078 | 3.0 | 3.0% | 1.52 | ≤0.3% | 20.5 | ≥220℃ |
| Example 3 | 89.8 | 0.081 | 2.9 | 3.1% | 1.54 | ≤0.3% | 21.0 | ≥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 (14)
1. A preparation method of high-performance aramid fiber nano mica insulation paper is characterized by comprising the following steps: (1) washing aramid fibers with warm water to obtain an aramid fiber raw material; placing aramid fiber, a catalyst and a dimethylacetamide solvent in a container, placing the container in a water bath, and mechanically stirring at a low speed to prepare a stable aramid transparent dispersion liquid M, wherein the aramid fiber 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 30-80 ℃, the washing time is 20-50 min, the catalyst is calcium chloride or potassium chloride or the mixture of the calcium chloride and the potassium chloride, and the mixing mass ratio is 1: 1-2; (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 air flow crushing on the nano mica precipitate D after high-temperature drying to obtain nano mica powder E; (4) continuously adding the nano mica powder E into the aramid transparent dispersion liquid M, and still stirring at a low speed in the adding process to prepare an aramid nano mica mixed liquid H; (5) adding a certain amount of ethanol into the aramid fiber nano mica powder mixed solution H, and continuously stirring at a low speed to separate out aramid fiber in the aramid fiber stock solution to form an aramid fiber coated nano mica powder mixed solution G; (6) mixing a certain proportion of aramid chopped fibers and aramid fibrids, and preparing an aramid fiber suspension I through high-speed dispersion; (7) fully mixing the prepared aramid fiber coated nano mica powder mixed solution G and the aramid fiber mixed solution I under low-speed stirring to prepare an aramid fiber nano mica mixed suspension F; (8) forming the mixed suspension F through a paper making machine, washing the formed mixed suspension F for multiple times through a mixed solution of water and ethanol, and finally preparing the high-performance aramid fiber nano mica insulation wet paper sheet; (9) drying the high-performance aramid fiber nano mica insulation wet paper to obtain high-performance aramid fiber nano mica insulation base paper; (10) 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 high-performance aramid nano mica insulation paper according to claim 1, wherein the proportion of the dimethylacetamide solvent, the catalyst and the aramid fiber in the step (1) is 500 ml: (0.1-2) g: (2-8) g, the water bath temperature is 40-90 ℃, and the mechanical stirring speed is 50-100 r/min.
3. The preparation method of the high-performance aramid nano mica insulation paper according to claim 1, wherein in the step (2), the nano mica powder is one or a mixture of muscovite and phlogopite, the particle size of the mica powder is 40-80 meshes, and the mass ratio of the mixture of the mica powder and the phlogopite is 2-5: 1.
4. The preparation method of the high-performance aramid 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: 1-5.
5. The preparation method of the high-performance aramid nano mica insulation paper according to claim 1, wherein the mass ratio of the mica powder to the grinding protection liquid to the water in the step (2) is 200 (1-2) to (400-500), and the grinding time is 5-20 min.
6. The preparation method of the high-performance aramid fiber nano mica insulation paper according to claim 1, wherein the acid solution in the step (3) is dilute hydrochloric acid or sulfuric acid, and the stirring time is controlled to be 5-20 min.
7. The preparation method of the high-performance aramid 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 80-105 ℃, and the nano mica powder E with high purity and high homogeneity is obtained after nano airflow pulverization.
8. The preparation method of the high-performance aramid fiber nano mica insulation paper according to claim 1, wherein the mass ratio of the nano mica powder E to the aramid fiber transparent dispersion liquid M in the step (4) is 1: 5-10, and the stirring speed is 40-80 r/min.
9. The preparation method of the high-performance aramid fiber nano mica insulation paper according to claim 1, wherein the mass ratio of the ethanol to the aramid fiber nano mica powder mixed solution H in the step (5) is 1: 3-10, and the stirring speed is 40-80 r/min.
10. The preparation method of the high-performance aramid nano mica insulation paper according to claim 1, wherein the proportion of the aramid chopped fibers, the aramid fibrids and the water in the step (6) is (0.5-1.5) g: (0.5-1.5) g: 500 ml.
11. The preparation method of the high-performance aramid nano mica insulation paper according to claim 1, wherein the stirring speed of the aramid coated nano mica powder mixed solution G and the aramid fiber mixed solution I in the step (7) is 50-100 r/min.
12. The preparation method of the high-performance aramid nano mica insulation paper according to claim 1, wherein the ratio of ethanol to water in the step (8) is 1: 5-10, and the washing times are 2-5.
13. The preparation method of the high-performance aramid nano mica insulation paper as claimed in claim 1, wherein the drying temperature of the wet paper web in the step (9) is 95-105 ℃.
14. The preparation method of the high-performance aramid nano 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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| 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 |
| CN113583441B (en) * | 2021-09-07 | 2022-06-28 | 平江县盛盈云母工业有限公司 | Insulating material with mica as base material 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 |
| CN115341410B (en) * | 2022-09-14 | 2023-06-02 | 平江县盛盈云母工业有限公司 | Composite mica paper |
| CN116377756B (en) * | 2023-03-20 | 2024-02-20 | 湖南荣泰新材料科技有限公司 | Method for improving interfacial bonding performance of mica and reinforced fiber |
| CN116285340B (en) * | 2023-04-06 | 2024-09-20 | 陕西科技大学 | Cable core wrapping tape for high-temperature-resistant muscovite-based flexible cable and preparation method thereof |
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