CN112663382B - High-mechanical-strength aramid fiber insulation paper and preparation method and application thereof - Google Patents
High-mechanical-strength aramid fiber insulation paper and preparation method and application thereof Download PDFInfo
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- 229920006231 aramid fiber Polymers 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 238000009413 insulation Methods 0.000 title claims description 17
- 239000004760 aramid Substances 0.000 claims abstract description 107
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 106
- 239000000835 fiber Substances 0.000 claims abstract description 62
- 239000008104 plant cellulose Substances 0.000 claims abstract description 42
- 238000004537 pulping Methods 0.000 claims abstract description 38
- 239000002002 slurry Substances 0.000 claims abstract description 30
- 238000013329 compounding Methods 0.000 claims abstract description 13
- 238000007731 hot pressing Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000010009 beating Methods 0.000 claims description 23
- 239000011268 mixed slurry Substances 0.000 claims description 19
- 239000002270 dispersing agent Substances 0.000 claims description 10
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 8
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 7
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- 238000004519 manufacturing process Methods 0.000 abstract description 3
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Abstract
The invention discloses aramid fiber insulating paper with high mechanical strength and a preparation method and application thereof, and belongs to the field of aramid fiber paper. The preparation method comprises the following steps: pulping the meta-aramid chopped fibers and the fibrids, compounding the meta-aramid chopped fibers and the fibrids, adding the plant cellulose nano fibrils, and post-processing paper. Respectively and effectively dispersing meta-aramid chopped fibers and fibrids, uniformly mixing the meta-aramid chopped fibers and the fibrids according to a mass ratio, adding plant cellulose nanofibrils into aramid fiber slurry, and carrying out ultra-low-concentration inclined-net wet forming and drying treatment on the slurry to obtain a primary paper sample; and hot pressing at high temperature to obtain the aramid fiber insulating paper with high mechanical strength. The invention utilizes the complementary advantages of the three types of special fibers to compound and manufacture the aramid fiber insulating paper, partially replaces the aramid fiber with the plant nano fiber with rich source and low cost, can obviously improve the mechanical property of the aramid fiber insulating paper, and ensures that the finished paper has good mechanical property while having good insulating property.
Description
Technical Field
The invention belongs to the field of aramid paper, and particularly relates to high-mechanical-strength aramid insulating paper as well as a preparation method and application thereof.
Background
Aramid fibers (i.e., aromatic polyamide fibers) are a new class of synthetic fibers for special purposes, generally have excellent properties such as high strength, high modulus, high temperature resistance, corrosion resistance, flame retardance, electrical insulation, light weight, chemical stability, thermal stability, and the like, and are representative of high-performance synthetic fibers. The aramid fiber is mainly divided into para-aramid fiber (aramid 1414) and meta-aramid fiber (aramid 1313), and the current main products comprise aramid chopped fiber, aramid short fiber, aramid fibrid and aramid pulp. With the rapid development of science and technology, aramid fibers have gained important attention in the international society and become important raw materials in various fields such as aerospace, national defense, industry, civil use and the like.
The aramid fiber paper is made by mixing aramid chopped fibers and fibrids (or pulp fibers) and papermaking. Aramid paper has been widely used in advanced fields such as high-temperature and high-voltage insulation, transportation, electrician and electronics, safety protection, and the like, such as transformers or motor coils, because aramid paper has excellent mechanical properties, good dielectric properties, outstanding insulating properties, excellent heat resistance, and the like, and can be used as shielding materials, insulating materials, filtering materials, and reinforcing materials. It is known that a high-voltage electrifying environment generates a large current, so that the temperature of the transformer or the motor is increased, and the transformer or the motor must have enough insulation strength and mechanical performance in order to avoid breakdown aging or damage of the transformer or the motor due to overhigh current. Usually, the transformer or the motor coil adopts aramid insulating paper as an insulating material, so the electrical property, the physical property and the like of the aramid insulating paper are very important.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the invention mainly aims to provide the preparation method of the aramid fiber insulation paper with high mechanical strength.
The invention also aims to provide the high-mechanical-strength aramid insulating paper prepared by the preparation method.
The invention further aims to provide application of the high-mechanical-strength aramid insulating paper in a transformer or a motor coil.
The purpose of the invention is realized by the following technical scheme.
A preparation method of high-mechanical-strength aramid insulating paper comprises the following operation steps:
(1) Pulping treatment: pulping and fully dispersing the meta-aramid chopped fibers and the meta-aramid fibrids in a PFI mill respectively, and adding the meta-aramid chopped fibers and the meta-aramid fibrids into a dispersing agent respectively for storage for later use;
(2) Compounding: uniformly mixing the meta-aramid chopped fibers obtained in the step (1) and meta-aramid fibrid dispersion liquid to obtain aramid fiber slurry;
(3) Addition of plant cellulose nanofibrils: adding plant cellulose nanofibrils into the aramid fiber slurry solution obtained in the step (2) under the condition of stirring to obtain mixed slurry;
(4) And (3) paper-forming post-treatment: and (4) performing ultralow-concentration molding and drying treatment on the mixed slurry inclined net obtained in the step (3) to obtain a primary paper sample, and performing high-temperature hot-pressing treatment to obtain the aramid fiber insulating paper.
Preferably, the beating revolution of the meta-aramid chopped fibers in the step (1) is 3500-5500 revolutions, the beating concentration is 3.0-5.0%, and the beating degree is 40-60 degrees; the beating revolution of the meta-aramid fibrid is 5500-7500 turns, the beating concentration is 2.0-5.0%, and the beating degree is 25-35 °.
Preferably, the dispersant in the step (1) is sodium polyacrylate, and the molecular weight is 2000-5000.
Preferably, after the pulping in the step (1), the mass concentration of the meta-aramid chopped fibers in the dispersion liquid is 0.4-0.7%, and the mass concentration of the meta-aramid fibrids in the dispersion liquid is 1.8-2.4%.
Preferably, the oven-dried mass ratio of the meta-aramid chopped fibers to the meta-aramid fibrids in the step (2) is 1:1 to 1:3.
preferably, the diameter of the plant cellulose nano fibril in the step (3) is 20-46 nm, the length is 783-1245 nm, and the adding amount is 2.0-10.0% of the absolute dry mass of the mixed slurry.
Preferably, the rotation speed of the stirring in the step (3) is 3000-5000r/min.
Preferably, the mass concentration of the slurry in the inclined wire ultra-low concentration forming in the step (4) is 0.10-0.15%; the high-temperature hot-pressing conditions are as follows: the temperature is 250-270 ℃; the pressure is 6.0-10.0 MPa; the time is 0.5 to 1.0 hour.
Aramid insulating paper with high mechanical strength is prepared by the preparation method.
The aramid fiber insulating paper with high mechanical strength is applied to a transformer or a motor coil.
The aramid fiber insulation paper with high mechanical strength is prepared by reasonably compounding various fibers, and meta-aramid chopped fiber is used as a framework material and is a main source of the physical strength of the paper; meta-aramid fibrids are used as bonding materials and are the main source of electrical insulation strength; the plant cellulose nano-fibrils are used as a nano-reinforcing agent and are uniformly distributed in the paper, so that the mechanical property of the aramid paper can be improved. Compounding the three fiber pulps according to a proper proportion, then adopting an ultra-low concentration inclined mesh paper machine wet forming technology, and then carrying out high-temperature hot pressing treatment to prepare the high-mechanical-strength aramid insulating paper for the transformer or the motor coil with excellent insulation grade.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The aramid fiber insulating paper with high mechanical strength is obtained by reasonably compounding three special fibers, and the advantages of different special fibers are fully utilized. The meta-aramid chopped fibers are uniformly distributed in the paper, so that the paper has good physical strength; meta-aramid fibrids are filled between the chopped fibers and the plant cellulose nano fibrils, so that the electrical insulation property of the paper is improved; the plant cellulose nano-fibril has high length-diameter ratio and large specific surface area, can be better bridged with chopped fibers and precipitated fibers, and improves the interface bonding force between fibers, thereby further enhancing the tight bonding between various fibers and obviously improving the mechanical property of aramid paper. Therefore, the comprehensive performance of the aramid fiber paper can be improved, and the paper has excellent insulating property and excellent mechanical property.
(2) The invention adopts the wet forming technology of the inclined wire paper machine with ultralow concentration (0.10-0.15%), can solve the problem that aramid fiber is easy to flocculate, realizes the uniform dispersion and forming of special fiber under ultralow concentration, and is beneficial to improving the mechanical performance of finished paper; meanwhile, the aramid fiber insulating paper is manufactured by a papermaking wet method, so that the energy consumption can be reduced, and the sustainable development concept is met.
(3) The plant cellulose has rich resources, has the characteristics of reproducibility and low price, is doped in the aramid fiber after being nanocrystallized to produce the aramid fiber insulating paper by composite papermaking, can obviously reduce the production cost, and has wide application prospect.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
The detection of various parameters in the invention is carried out according to the national standard detection method and the industry standard, and specifically comprises the following steps: and (3) testing performances such as thickness (GB/T20628.2-2006), tensile strength (GB/T451.2-2002), tear strength (GB/T455-2002), electric strength (GB/T5019.2-2009), dielectric constant and dielectric loss factor (GB/T1409-2006).
The aramid chopped fibers and fibrids used in the examples of the present invention were purchased from a special fiber manufacturing company, ltd.
The preparation method of the plant cellulose nanofibrils comprises the following steps:
(1) Pretreatment of cellulase: adding pulp of eucalyptus pulp (the concentration is 1.5-2.5 wt%) into an acidic buffer solution (the concentration is 40-60 mmol/L), then adding an enzyme reagent (Banzyme 2900, the dosage of the enzyme reagent is calculated according to the addition of 10-16 mg of the enzyme reagent into each gram of plant fiber), and carrying out enzymolysis for 0.5-2.0 h at the temperature of 50-60 ℃ to obtain pulp after enzymolysis;
(2) Mechanical grinding treatment: adding water into the slurry after enzymolysis to prepare the slurry into a concentration of 1.0wt%, and then placing the slurry into an ultramicron grinder to carry out mechanical grinding treatment, wherein the rotating speed is controlled to 2800rpm. The disc gap and the number of grindings were +50 μm (8 passes), +20 μm (8 passes), 0 μm (10 passes), -20 μm (10 passes), -50 μm (20 passes), -80 μm (5 passes) and-100 μm (5 passes), respectively. And washing to obtain the plant cellulose nano fibril suspension.
Example 1
The preparation method of the aramid fiber insulating paper with high mechanical strength provided by the embodiment comprises the following specific preparation steps:
(1) Pulping treatment: pulping the meta-aramid chopped fibers in a PFI mill, wherein the pulping revolution is 3500 revolutions, the pulping concentration is 3.0 percent, and the pulping degree is 40 degrees; the meta-aramid fibrid is beaten in a PFI mill at 5500 revolutions at a beating concentration of 2.0% and a beating degree of 25 °. Respectively adding a sodium polyacrylate dispersant with the molecular weight of 2000 into the meta-aramid chopped fibers and the fibrids, controlling the mass concentration of the meta-aramid chopped fibers to be 0.4 percent and the mass concentration of the meta-aramid fibrids to be 1.8 percent, and storing for later use;
(2) Compounding: and (2) performing oven-dry mass ratio of the meta-aramid chopped fibers and the meta-aramid fibrids obtained in the step (1) to 1:1, uniformly mixing to obtain aramid fiber slurry;
(3) Addition of plant cellulose nanofibrils: adding a plant cellulose nano fibril suspension with the concentration of 1.0wt% into the aramid fiber slurry solution in the step (2) under the condition of high-speed stirring (rotating speed: 3000 r/min), wherein the diameter of the plant cellulose nano fibril is 25-37 nm, the length of the plant cellulose nano fibril is 783-1026 nm, and the adding amount of the plant cellulose nano fibril is 2.0 percent of the absolute dry mass of the mixed slurry, so as to prepare the mixed slurry;
(4) And (3) paper-forming post-treatment: carrying out wet forming and drying treatment on the mixed slurry obtained in the step (3) on an inclined wire paper machine with the slurry concentration of 0.10% to obtain an initial paper pattern; and then carrying out high-temperature hot-pressing treatment for 0.5h at the temperature of 250 ℃ and the pressure of 6.0MPa to obtain the aramid fiber insulating paper with high mechanical strength.
The performance detection data of the high mechanical strength aramid insulation paper of the embodiment is as follows: sample thickness: 0.58mm; tensile strength: transverse direction 52.7kN/m; longitudinal direction 53.3kN/m; tear strength: transverse direction 16.8N; longitudinal 16.5N; electrical strength: 20.1kV/mm; dielectric constant (50 Hz): 3.35; dielectric loss factor (50 Hz): 0.015.
example 2
The preparation method of the aramid fiber insulating paper with high mechanical strength provided by the embodiment comprises the following specific preparation steps:
(1) Pulping treatment: pulping the meta-aramid chopped fibers in a PFI mill, wherein the pulping revolution is 4000 turns, the pulping concentration is 4.0 percent, and the pulping degree is 50 degrees; the meta-aramid fibrid is pulped in a PFI mill at 6000 revolutions at a pulping concentration of 3.0% and a pulping degree of 30 °. Respectively adding a sodium polyacrylate dispersant with the molecular weight of 3000 into the meta-aramid chopped fibers and the fibrids, controlling the mass concentration of the meta-aramid chopped fibers to be 0.5 percent and the mass concentration of the meta-aramid fibrids to be 2.0 percent, and storing for later use;
(2) Compounding: and (2) performing oven-dry mass ratio of the meta-aramid chopped fibers and the meta-aramid fibrids obtained in the step (1) to 1:2, uniformly mixing to obtain aramid fiber slurry;
(3) Addition of plant cellulose nanofibrils: adding a plant cellulose nano fibril suspension with the concentration of 1.0wt% into the aramid fiber slurry solution in the step (2) under the condition of high-speed stirring (the rotating speed: 4000 r/min), wherein the diameter of the plant cellulose nano fibril is 34-43 nm, the length of the plant cellulose nano fibril is 867-1152 nm, and the adding amount of the plant cellulose nano fibril is 5.0 percent of the absolute dry mass of the mixed slurry, so as to prepare the mixed slurry;
(4) And (3) paper-forming post-treatment: carrying out wet forming and drying treatment on the mixed slurry obtained in the step (3) on an inclined wire paper machine with the slurry concentration of 0.12% to obtain a primary paper pattern; and then carrying out high-temperature hot-pressing treatment for 0.8h under the conditions that the temperature is 260 ℃ and the pressure is 8.0MPa to obtain the aramid fiber insulating paper with high mechanical strength.
The performance detection data of the high mechanical strength aramid insulation paper of the embodiment is as follows: sample thickness: 0.63mm; tensile strength: transverse direction 55.0kN/m; longitudinal direction 55.7kN/m; tear strength: transverse direction 17.4N; longitudinal direction 17.2N; electrical strength: 20.6kV/mm; dielectric constant (50 Hz): 3.47; dielectric loss factor (50 Hz): 0.017.
example 3
The preparation method of the aramid fiber insulating paper with high mechanical strength provided by the embodiment comprises the following specific preparation steps:
(1) Pulping treatment: pulping the meta-aramid chopped fibers in a PFI mill, wherein the pulping revolution is 4500 revolutions, the pulping concentration is 4.5 percent, and the pulping degree is 60 degrees; the meta-aramid fibrid is beaten in a PFI mill at 7000 revolutions at a beating concentration of 4.0% and a beating degree of 30 °. Respectively adding a sodium polyacrylate dispersant with the molecular weight of 4000 into the meta-aramid chopped fibers and the fibrids, controlling the mass concentration of the meta-aramid chopped fibers to be 0.6 percent and the mass concentration of the meta-aramid fibrids to be 2.2 percent, and storing for later use;
(2) Compounding: and (2) the meta-aramid chopped fibers and the meta-aramid fibrids obtained in the step (1) are dried in an oven-dry mass ratio of 1:3, uniformly mixing to obtain aramid fiber slurry;
(3) Addition of plant cellulose nanofibrils: adding a plant cellulose nanofibril suspension with the concentration of 1.0wt% into the aramid fiber slurry solution in the step (2) under the condition of high-speed stirring (the rotating speed is 5000 r/min), wherein the diameter of the plant cellulose nanofibril is 20-36 nm, the length of the plant cellulose nanofibril is 923-1195 nm, and the adding amount of the plant cellulose nanofibril is 8.0 percent of the absolute dry mass of the mixed slurry to prepare the mixed slurry;
(4) And (3) paper forming post-treatment: carrying out wet forming and drying treatment on the mixed slurry obtained in the step (3) on an inclined wire paper machine with the slurry concentration of 0.14% to obtain a primary paper pattern; and then carrying out high-temperature hot-pressing treatment for 1.0h at the temperature of 270 ℃ and the pressure of 9.0MPa to obtain the aramid fiber insulating paper with high mechanical strength.
The performance detection data of the high mechanical strength aramid insulation paper of the embodiment are as follows: sample thickness: 0.69mm; tensile strength: transverse direction 57.8kN/m; longitudinal direction 58.6kN/m; tear strength: transverse 18.7N; longitudinal 18.3N; electrical strength: 21.3kV/mm; dielectric constant (50 Hz): 3.58; dielectric loss factor (50 Hz): 0.018.
example 4
The preparation method of the aramid fiber insulating paper with high mechanical strength provided by the embodiment comprises the following specific preparation steps:
(1) Pulping treatment: pulping the meta-aramid chopped fibers in a PFI mill, wherein the pulping revolution is 5500 revolutions, the pulping concentration is 5.0 percent, and the pulping degree is 60 degrees; the meta-aramid fibrid is beaten in a PFI mill at 7500 r with beating concentration of 5.0% and beating degree of 35 deg. Respectively adding a sodium polyacrylate dispersing agent with the molecular weight of 5000 into the meta-aramid chopped fibers and the fibrids, controlling the mass concentration of the meta-aramid chopped fibers to be 0.7 percent and the mass concentration of the meta-aramid fibrids to be 2.4 percent, and storing for later use;
(2) Compounding: and (2) the meta-aramid chopped fibers and the meta-aramid fibrids obtained in the step (1) are dried in an oven-dry mass ratio of 1:3, uniformly mixing to obtain aramid fiber slurry;
(3) Addition of plant cellulose nanofibrils: adding a plant cellulose nanofibril suspension with the concentration of 1.0wt% into the aramid fiber pulp solution in the step (2) under the condition of high-speed stirring (the rotating speed is 5000 r/min), wherein the diameter of the plant cellulose nanofibril is 29-46 nm, the length of the plant cellulose nanofibril is 986-1245 nm, and the adding amount of the plant cellulose nanofibril is 10.0 percent of the absolute dry mass of the mixed pulp to prepare the mixed pulp;
(4) And (3) paper forming post-treatment: carrying out wet forming and drying treatment on the mixed slurry obtained in the step (3) on an inclined wire paper machine with the slurry concentration of 0.15% to obtain a primary paper pattern; and then carrying out high-temperature hot-pressing treatment for 1.0h under the conditions that the temperature is 270 ℃ and the pressure is 10.0MPa to obtain the aramid fiber insulating paper with high mechanical strength.
The performance detection data of the high mechanical strength aramid insulation paper of the embodiment are as follows: sample thickness: 0.74mm; tensile strength: transverse direction 59.7kN/m; longitudinal direction 60.6kN/m; tear strength: transverse 19.2N; longitudinal 18.9N; electrical strength: 21.8kV/mm; dielectric constant (50 Hz): 3.74 of; dielectric loss factor (50 Hz): 0.019.
comparative example 1
The preparation method of the aramid fiber insulating paper comprises the following specific preparation steps:
(1) Pulping treatment: pulping the meta-aramid chopped fibers in a PFI mill, wherein the pulping revolution is 3500 revolutions, the pulping concentration is 3.0 percent, and the pulping degree is 40 degrees; the meta-aramid fibrid is beaten in a PFI mill at 5500 revolutions at a beating concentration of 2.0% and a beating degree of 25 °. Respectively adding a sodium polyacrylate dispersant with the molecular weight of 2000 into the meta-aramid chopped fibers and the fibrids, controlling the mass concentration of the meta-aramid chopped fibers to be 0.4 percent and the mass concentration of the meta-aramid fibrids to be 1.8 percent, and storing for later use;
(2) Compounding: and (2) the meta-aramid chopped fibers and the meta-aramid fibrids obtained in the step (1) are dried in an oven-dry mass ratio of 1:1, uniformly mixing to obtain aramid fiber slurry;
(3) And (3) paper-forming post-treatment: carrying out wet forming and drying treatment on the aramid fiber pulp obtained by compounding in the step (2) on an inclined wire paper machine with the pulp concentration of 0.10% to obtain a primary paper sample; and then carrying out high-temperature hot-pressing treatment for 0.5h at the temperature of 250 ℃ and the pressure of 6.0MPa to obtain the aramid fiber insulating paper.
The performance detection data of the aramid insulation paper of the embodiment: sample thickness: 0.58mm; tensile strength: transverse direction 43.5kN/m; longitudinal direction 44.3kN/m; tear strength: transverse direction 12.6N; longitudinal direction 12.1N; electrical strength: 20.7kV/mm; dielectric constant (50 Hz): 3.41; dielectric loss factor (50 Hz): 0.016.
comparative example 2
The preparation method of the aramid fiber insulating paper comprises the following specific preparation steps:
(1) Pulping treatment: pulping the meta-aramid chopped fibers in a PFI mill, wherein the pulping revolution is 3500 revolutions, the pulping concentration is 3.0 percent, and the pulping degree is 40 degrees; the meta-aramid fibrid is beaten in a PFI mill at 5500 revolutions at a beating concentration of 2.0% and a beating degree of 25 °. Respectively adding a sodium polyacrylate dispersant with the molecular weight of 2000 into the meta-aramid chopped fibers and the fibrids, controlling the mass concentration of the meta-aramid chopped fibers to be 0.4 percent and the mass concentration of the meta-aramid fibrids to be 1.8 percent, and storing for later use;
(2) Compounding: and (2) performing oven-dry mass ratio of the meta-aramid chopped fibers and the meta-aramid fibrids obtained in the step (1) to 1:1, uniformly mixing to obtain aramid fiber slurry;
(3) Addition of plant cellulose nanofibrils: adding a plant cellulose nano fibril suspension with the concentration of 1.0wt% into the aramid fiber slurry solution in the step (2) under the condition of high-speed stirring (the rotating speed is 3000 r/min), wherein the diameter of the plant cellulose nano fibril is 25-37 nm, the length of the plant cellulose nano fibril is 783-1026 nm, and the adding amount of the plant cellulose nano fibril is 2.0 percent of the absolute dry mass of the mixed slurry, so as to prepare the mixed slurry;
(4) And (3) paper forming post-treatment: carrying out wet forming and drying treatment on the mixed slurry obtained in the step (3) on a fourdrinier paper machine with the slurry concentration of 0.10% to obtain a primary paper pattern; and then carrying out high-temperature hot-pressing treatment for 0.5h under the conditions that the temperature is 250 ℃ and the pressure is 6.0MPa to obtain the aramid fiber insulating paper.
The performance detection data of the aramid insulation paper of the embodiment: sample thickness: 0.58mm; tensile strength: transverse direction 17.8kN/m; longitudinal direction 49.2kN/m; tear strength: transverse direction 13.7N; longitudinal direction 15.3N; electrical strength: 20.1kV/mm; dielectric constant (50 Hz): 3.35; dielectric loss factor (50 Hz): 0.015.
the above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (5)
1. A preparation method of high-mechanical-strength aramid insulating paper is characterized by comprising the following steps:
(1) Pulping treatment: pulping and fully dispersing meta-aramid chopped fibers and meta-aramid fibrids in a PFI mill respectively, and adding a dispersing agent respectively for storage for later use;
the beating revolution of the meta-aramid chopped fiber in the step (1) is 3500-5500 turns, the beating concentration is 3.0-5.0%, and the beating degree is 40-60 DEG SR; the beating revolution of the meta-aramid fibrid is 5500-7500 turns, the beating concentration is 2.0-5.0%, and the beating degree is 25-35 DEG SR;
the dispersant in the step (1) is sodium polyacrylate with the molecular weight of 2000-5000;
(2) Compounding: uniformly mixing the meta-aramid chopped fibers obtained in the step (1) and meta-aramid fibrid dispersion liquid to obtain aramid fiber slurry;
(3) Addition of plant cellulose nanofibrils: adding plant cellulose nanofibrils into the aramid fiber slurry obtained in the step (2) under the stirring condition to obtain mixed slurry;
the stirring speed in the step (3) is 3000-5000 r/min;
the diameter of the plant cellulose nano fibril in the step (3) is 20-46 nm, and the length is 783-1245 nm; the addition amount of the plant cellulose nano-fibril is 2.0-10.0% of the absolute dry mass of the mixed slurry;
(4) And (3) paper forming post-treatment: performing inclined-net ultralow-concentration forming and drying treatment on the mixed slurry obtained in the step (3) to obtain a primary paper sample, and performing high-temperature hot-pressing treatment to obtain aramid fiber insulating paper;
the mass concentration of the slurry in the ultra-low concentration molding of the inclined wire mesh in the step (4) is 0.10-0.15%; the high-temperature hot-pressing condition is as follows: the temperature is 250 to 270 ℃, the pressure is 6.0 to 10.0MPa, and the time is 0.5 to 1.0 h;
the preparation method of the plant cellulose nanofibrils comprises the following steps:
a. pretreatment of cellulase: adding the pulp of eucalyptus pulp with the concentration of 1.5-2.5 wt% into an acidic buffer solution with the concentration of 40-60 mmol/L, and then adding an enzyme reagent, wherein the dosage of the enzyme reagent is calculated by adding 10-16 mg of the enzyme reagent into per gram of plant fiber, and carrying out enzymolysis for 0.5-2.0 h at the temperature of 50-60 ℃ to obtain the pulp after enzymolysis;
b. and (3) mechanical grinding treatment: adding water into the slurry after enzymolysis to prepare the slurry into a concentration of 1.0wt%, then placing the slurry into an ultramicron grinder to carry out mechanical grinding treatment, controlling the rotating speed to 2800rpm, and respectively setting the grinding disc clearance and the grinding times to be +50 mu m 8 times, +20 mu m 8 times, 0 mu m 10 times, 20 mu m 10 times, 50 mu m 20 times, 80 mu m 5 times and-100 mu m 5 times, and washing to obtain the plant cellulose nanofibril suspension finally.
2. The preparation method of the aramid insulation paper with high mechanical strength as claimed in claim 1, wherein after the beating in the step (1), the mass concentration of the meta-aramid chopped fibers in the dispersion liquid is 0.4-0.7%, and the mass concentration of the meta-aramid fibrids in the dispersion liquid is 1.8-2.4%.
3. The preparation method of the aramid insulation paper with high mechanical strength as claimed in claim 1, wherein the absolute dry mass ratio of the meta-aramid chopped fibers to the meta-aramid fibrids in the aramid fiber slurry in the step (2) is 1:1 to 1:3.
4. a high mechanical strength aramid insulation paper characterized by being prepared by the preparation method of any one of claims 1 to 3.
5. Use of the high mechanical strength aramid insulation paper of claim 4 in a transformer or motor coil.
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