CN112111995A - Preparation method of montmorillonite modified transformer insulation paper - Google Patents
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- CN112111995A CN112111995A CN202010979606.XA CN202010979606A CN112111995A CN 112111995 A CN112111995 A CN 112111995A CN 202010979606 A CN202010979606 A CN 202010979606A CN 112111995 A CN112111995 A CN 112111995A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/18—Paper- or board-based structures for surface covering
- D21H27/22—Structures being applied on the surface by special manufacturing processes, e.g. in presses
- D21H27/26—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
- D21H27/28—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures treated to obtain specific resistance properties, e.g. against wear or weather
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/46—Non-macromolecular organic compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/64—Inorganic compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/42—Paper being at least partly surrounded by the material on both sides
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Abstract
The invention provides a preparation method of montmorillonite modified transformer insulation paper, which comprises the steps of crosslinking quaternary ammonium salt modified montmorillonite with polyvinyl alcohol and glutaraldehyde under an acidic condition to obtain a second mixed solution, and then adding the second mixed solution in a pulling dipping, spin coating or LB (Langmuir-Blodgett) coating mode to obtain the montmorillonite modified transformer insulation paper which has higher volume resistivity and lower surface resistivity.
Description
Technical Field
The invention relates to the field of high-temperature insulation and protection materials, in particular to a preparation method of montmorillonite modified transformer insulation paper.
Background
The insulating paper is a generic name of paper for electrical insulation, and is used as an insulating material for various electric appliances such as cables and coils. With the rapid development of science and technology, the requirements of the electronic and electrical industry on devices are higher and higher, and more film materials with high temperature resistance, high strength and good insulation are expected to be selected, so that the production cost is reduced, and the application range is expanded.
Montmorillonite is an expansive type layered silicate, has a unique two-dimensional layered nano structure and cation exchange performance, has good dispersity, and can be added into a polymer as an additive to improve the mechanical property, the size stability, the gas barrier property and the insulativity of the polymer.
The prior art CN106320059A discloses an insulation paper containing modified montmorillonite, which is prepared by mixing the modified montmorillonite, silicon dioxide, bamboo fiber and the like with concentrated paper pulp, hot pressing and drying. However, the montmorillonite in the insulating paper is disorderly arranged and has no structural regulation, so that the mechanical property and the insulating property of the insulating paper cannot meet the use requirement of a high-power transformer.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a preparation method of montmorillonite modified transformer insulation paper.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention relates to a preparation method of montmorillonite modified transformer insulation paper, which comprises the following steps:
(1) adding quaternary ammonium salt modified montmorillonite into water, and performing ultrasonic dispersion to obtain a quaternary ammonium salt modified montmorillonite dispersion liquid;
(2) mixing the quaternary ammonium salt modified montmorillonite dispersion liquid with a polyvinyl alcohol aqueous solution, and performing ultrasonic dispersion to obtain a first mixed solution;
(3) adding hydrochloric acid and a glutaraldehyde aqueous solution into the first mixed solution, and stirring and mixing to obtain a second mixed solution;
(4) and (3) carrying out dip coating on the common insulating paper in the second mixed solution, or coating the second mixed solution on the surface of the common insulating paper by adopting an LB (Langmuir-Blodgett) coating technology or a spin coating technology, and repeating the coating process for 4-8 times to obtain the montmorillonite modified transformer insulating paper.
Preferably, in the step (1), the mass fraction of the quaternary ammonium salt modified montmorillonite in the quaternary ammonium salt modified montmorillonite dispersion liquid is 0.5-10%.
Preferably, in step (1), the quaternary ammonium salt is cetyl trimethyl ammonium bromide or stearyl trimethyl ammonium bromide.
Preferably, in the step (1), the preparation method of the quaternary ammonium salt modified montmorillonite comprises the following steps:
[1] adding sodium-based montmorillonite into water, and performing ultrasonic dispersion to obtain a sodium-based montmorillonite dispersion liquid;
[2] and adjusting the pH value of the sodium-based montmorillonite dispersion liquid to 5-6, adding quaternary ammonium salt, heating and stirring, carrying out suction filtration and washing on obtained precipitates after the reaction is finished, and drying to obtain the quaternary ammonium salt modified montmorillonite.
Preferably, in the step [1], the mass fraction of the sodium-based montmorillonite in the sodium-based montmorillonite dispersion liquid is 0.5-10%.
Preferably, in step [2], the pH is adjusted with acetic acid.
Preferably, in the step [2], the dosage ratio of the sodium montmorillonite to the quaternary ammonium salt is 10g (5-15) mmol.
Preferably, in the step [2], the heating temperature is 85-95 ℃, and the stirring time is 1-3 hours.
Preferably, in the step (2), the mass concentration of the polyvinyl alcohol aqueous solution is 0.5-10%, and the mass ratio of the quaternary ammonium salt modified montmorillonite to the polyvinyl alcohol is 1 (0.5-2).
Preferably, in the step (3), the mass concentration of the aqueous solution of glutaraldehyde solution is 10% -50%, the molar ratio of HCl in hydrochloric acid to glutaraldehyde is 1 (2-6), and the molar ratio of hydroxyl in polyvinyl alcohol to glutaraldehyde is (10-20): 1.
The invention has the beneficial effects that:
the invention provides a preparation method of montmorillonite modified transformer insulation paper, which comprises the steps of crosslinking quaternary ammonium salt modified montmorillonite with polyvinyl alcohol and glutaraldehyde under an acidic condition to obtain a second mixed solution, and then adding the second mixed solution in a pulling dipping, spin coating or LB (Langmuir-Blodgett) coating mode to obtain the montmorillonite modified transformer insulation paper which has higher volume resistivity and lower surface resistivity. Furthermore, the insulating paper modified by the montmorillonite has better corona aging resistance, and the corona aging resistance is enhanced along with the increase of the film coating times; and has more excellent partial discharge characteristics, the breakdown voltage of which is increased, the partial discharge amount is reduced, and the partial discharge is weakened.
Drawings
FIG. 1 is an SEM image of quaternary ammonium salt modified montmorillonite prepared in preparation example 3;
FIG. 2 is an XRD pattern of ordinary sodium-based montmorillonite and quaternary ammonium salt modified montmorillonite prepared in preparation example 3;
FIG. 3 is an SEM image of montmorillonite modified insulating paper prepared in example 3;
fig. 4 is a graph showing the change in volume resistivity of the common insulating paper and the modified insulating paper in the same batch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The embodiment of the invention relates to a preparation method of montmorillonite modified transformer insulation paper, which comprises the following steps:
(1) adding quaternary ammonium salt modified montmorillonite into water, and performing ultrasonic dispersion to obtain a quaternary ammonium salt modified montmorillonite dispersion liquid;
in one embodiment of the invention, the mass fraction of the quaternary ammonium salt modified montmorillonite in the quaternary ammonium salt modified montmorillonite dispersion liquid is 0.5-10%. In a certain range, the more the number of carbon atoms in the quaternary ammonium salt used as the modifier is, the better the modification effect is, but the overlong carbon atom chain can adversely affect the intercalation agent to enter the interlayer of the montmorillonite, so the quaternary ammonium salt selected by the invention is cetyl trimethyl ammonium bromide or octadecyl trimethyl ammonium bromide.
In one embodiment of the invention, the preparation method of the quaternary ammonium salt modified montmorillonite comprises the following steps:
[1] adding sodium-based montmorillonite into water, and performing ultrasonic dispersion to obtain a sodium-based montmorillonite dispersion liquid, wherein the mass fraction of the sodium-based montmorillonite in the sodium-based montmorillonite dispersion liquid is preferably 0.5-10%;
[2] and adjusting the pH value of the sodium-based montmorillonite dispersion liquid to 5-6, adding quaternary ammonium salt, heating and stirring, carrying out suction filtration and washing on obtained precipitates after the reaction is finished, and drying to obtain the quaternary ammonium salt modified montmorillonite.
The pH value of the sodium-based montmorillonite dispersion liquid is adjusted to 5-6, and the effect of adding quaternary ammonium salt is to increase the interlayer spacing of montmorillonite sheets. Specifically, the montmorillonite has a lamella spacing of about 1nm, and contains hydrated Ca between layers of lamellar structure2+，Na+And the like, exchangeable inorganic cations. Because the water absorption and expansion times of the sodium-based montmorillonite are larger, the cation exchange capacity is higher, and the water dispersibility is better, the Na-containing montmorillonite composite material selects and contains Na+Sodium montmorillonite. The change of organic amine containing hydroxyl can change the polarity of silicate sheet and reduce its surface energy, so as to increase the affinity between two phases and obviously increase the interlayer distance.
In the process, acetic acid is preferably adopted to adjust the pH value, and the dosage ratio of the sodium montmorillonite to the quaternary ammonium salt is 10g (5-15) mmol. The heating temperature is 85-95 ℃, and the stirring time is 1-3 hours.
(2) Mixing the quaternary ammonium salt modified montmorillonite dispersion liquid with a polyvinyl alcohol (PVA) aqueous solution, and performing ultrasonic dispersion to obtain a first mixed solution;
in one embodiment of the invention, the mass concentration of the polyvinyl alcohol aqueous solution is 0.5-10%, and the mass ratio of the quaternary ammonium salt modified montmorillonite to the polyvinyl alcohol is 1 (0.5-2).
(3) Adding hydrochloric acid and a Glutaraldehyde (GA) aqueous solution into the first mixed solution, and stirring and mixing to obtain a second mixed solution;
in one embodiment of the invention, the mass concentration of the glutaraldehyde aqueous solution is 10-50%, and glutaraldehyde aqueous solutions with different concentrations can be directly purchased at present. The molar ratio of HCl in the hydrochloric acid to glutaraldehyde is 1 (2-6), and the molar ratio of hydroxyl in the polyvinyl alcohol to glutaraldehyde is 10-20: 1. Since polyvinyl alcohol is a polymer in which each monomeric vinyl alcohol has one hydroxyl group. Taking the relative molecular weight of the polyvinyl alcohol as 67000 as an example, the molecular weight of the monomer is 44, and the relative molecular weight of the polyvinyl alcohol is divided by the molecular weight of the monomer to calculate that 1523 hydroxyl groups are contained in 1mol of the polyvinyl alcohol.
Further, in the process of preparing the first mixed solution and the second mixed solution, HCl is an acidic catalyst for the crosslinking reaction, and the catalytic effect of hydrochloric acid is the best among common inorganic acids. Glutaraldehyde is a cross-linking agent, and the cross-linking of the polyvinyl alcohol and the glutaraldehyde is an aldol condensation reaction of hydroxyl and aldehyde groups. Under acidic condition, aldehyde group reacts with hydroxyl group to generate hemiacetal, and the hemiacetal and the hydroxyl group are dehydrated and condensed to generate ether. Thus one aldehyde group can react with at most two hydroxyl groups. Compared with monoaldehyde, two aldehyde groups of glutaraldehyde molecule can react with more hydroxyl groups, so that glutaraldehyde reacts with polyvinyl alcohol more quickly and forms cured cross-linked product more easily. Specifically, two aldehyde groups of glutaraldehyde are respectively connected with the polyvinyl alcohol and the hydroxyl on the montmorillonite to form a cross-linked structure.
(4) And (3) carrying out dip coating on the common insulating paper in the second mixed solution, or coating the second mixed solution on the surface of the common insulating paper by adopting an LB (Langmuir-Blodgett) coating technology or a spin coating technology, and repeating the coating process for 4-8 times to obtain the montmorillonite modified transformer insulating paper.
Further, in the process of preparing the montmorillonite modified transformer insulation paper, enabling common insulation paper (with the thickness of 500 microns) to vertically downwards enter the second mixed solution, soaking for about 8-20 seconds, vertically hanging after being pulled and taken out, and drying and crosslinking for 10-50 minutes at the temperature of 60-80 ℃. In order to keep the coating on the surface of the film and the insulating paper uniform, the insulating paper is turned over by 180 degrees before the next impregnation, and then is placed in the second mixed solution for impregnation. Theoretically, the more times of dipping, the better the insulation effect, and in consideration of the balance between efficiency and insulation performance, the coating process is repeated for 4-8 times to obtain a coating with enough thickness for operation and test.
Preparation example
The preparation method of the quaternary ammonium salt modified montmorillonite comprises the following steps:
[1] adding sodium-based montmorillonite into water for ultrasonic dispersion, setting the maximum power to be 500W, the frequency to be 40KHz and the time to be 2h, and obtaining sodium-based montmorillonite dispersion liquid with the mass fraction of 1.5%;
[2] adding acetic acid into the sodium-based montmorillonite dispersion liquid, adjusting the pH value to 5-6, then adding hexadecyl trimethyl ammonium bromide, and stirring for 2 hours at the temperature of 90 ℃ and the rotating speed of 500r/min, wherein the dosage ratio of the sodium-based montmorillonite to the quaternary ammonium salt is 10g (5-15) mmol. After the reaction is finished, the obtained precipitate is filtered, washed and dried at 80 ℃ to obtain the quaternary ammonium salt modified montmorillonite.
The setting mode of the preparation examples 1 to 6 is shown in table 1 by changing the dosage ratio of the sodium montmorillonite to the quaternary ammonium salt and keeping other conditions unchanged.
TABLE 1
| Preparation example | The dosage ratio of sodium montmorillonite to quaternary ammonium salt |
| Preparation example 1 | 10g:5mmol |
| Preparation example 2 | 10g:7mmol |
| Preparation example 3 | 10g:9mmol |
| Preparation example 4 | 10g:11mmol |
| Preparation example 5 | 10g:13mmol |
| Preparation example 6 | 10g:15mmol |
And performing SEM and XRD characterization on the quaternary ammonium salt modified montmorillonite prepared in the preparation example. Wherein the montmorillonite layers of preparation examples 1 and 2 did not peel well. The degree of exfoliation in example 3 was good, and the degree of exfoliation in examples 4-6 was not much different from that in example 3 as the amount of quaternary ammonium salt used was increased. Therefore, the optimal dosage ratio of the sodium montmorillonite to the quaternary ammonium salt is determined to be 10g:9 mmol.
The quaternary ammonium salt modified montmorillonite prepared in preparation example 3 is subjected to morphology characterization by using a field emission Scanning Electron Microscope (SEM), and the result is shown in FIG. 1, so that the separation degree of montmorillonite layers is high, which indicates that the stripping degree of the quaternary ammonium salt modified montmorillonite layers is good; an X-ray diffractometer (XRD) is used for phase analysis, an X-ray diffraction pattern of the common sodium-based montmorillonite (MMT) and the quaternary ammonium salt modified montmorillonite (MMT-CTAB) prepared in the preparation example 3 is shown in figure 2, the characteristic peak of the MMT-CTAB is obviously shifted to the right, the peak intensity reduction amplitude is large, and the interlayer spacing of the quaternary ammonium salt modified montmorillonite is obviously increased.
Example 1
The preparation method of the montmorillonite modified transformer insulating paper comprises the following steps:
(1) adding the quaternary ammonium salt modified montmorillonite prepared in the preparation example 3 into water, and performing ultrasonic dispersion to obtain a quaternary ammonium salt modified montmorillonite dispersion liquid with the mass fraction of 1.5%;
(2) mixing the quaternary ammonium salt modified montmorillonite dispersion liquid with a polyvinyl alcohol aqueous solution with the mass fraction of 1.5%, and performing ultrasonic dispersion to obtain a first mixed solution, wherein the mass ratio of the quaternary ammonium salt modified montmorillonite to the polyvinyl alcohol is 1 (0.5-2);
(3) adding hydrochloric acid and a glutaraldehyde aqueous solution into the first mixed solution, stirring and mixing to obtain a second mixed solution, wherein the mass concentration of the glutaraldehyde aqueous solution is 50%, the molar ratio of HCl in the hydrochloric acid to glutaraldehyde is 1:5, and the molar ratio of hydroxyl in polyvinyl alcohol to glutaraldehyde is (10-30): 1;
in examples 2-7, the mass ratio of the quaternary ammonium salt modified montmorillonite to the polyvinyl alcohol and the molar ratio of hydroxyl in the polyvinyl alcohol to glutaraldehyde are changed, other conditions are unchanged, and the specific setting mode is shown in table 2.
TABLE 2
(4) Soaking common insulating paper with thickness of 500 μm and size of 10 × 10cm in the second mixed solution for 10 s, pulling at 100mm/min with a constant speed puller, drying in an oven, and drying and crosslinking at 70 deg.C for 30 min. In order to keep the coating on the surface of the film and the insulating paper uniform, the insulating paper is turned over by 180 degrees before the next impregnation, and then is placed in the second mixed solution for impregnation. The above coating process was repeated 6 times to obtain a sufficiently thick coating for operation and testing.
The appearance of the montmorillonite modified insulating paper prepared in example 3 is characterized by adopting SEM, and the result is shown in FIG. 3, which shows that the fiber surface of the insulating paper is coated by montmorillonite layers and large particles, and the montmorillonite is well contacted with the surface of the insulating paper.
(5) The obtained montmorillonite modified insulating paper is cut into the size of about 3cm multiplied by 3cm, dried for 24 hours in a vacuum box at the temperature of 105 +/-5 ℃, and dried for 48 hours in the vacuum box at the temperature of 105 +/-5 ℃. And then, soaking the dried montmorillonite modified insulating paper in transformer oil for 48 hours at the temperature of 105 +/-5 ℃ in a vacuum box to obtain a well-soaked insulating paper sample.
The volume resistivity of the insulation paper samples was sampled using a K6517B resistance box and the change in volume resistivity is shown in fig. 4. Common to the same batchThe volume resistivity of the insulating paper (compared with the film 1 and the non-film 1) after the insulating paper is subjected to montmorillonite modification treatment is 4.50E +013(4.5 multiplied by 10)13) The omega cm is lifted to 12E +014 (12X 10)14) Omega cm. Specific volume resistivity and surface resistivity values are shown in table 3.
TABLE 3
| Examples | Volume resistivity (omega cm) | Surface resistivity (omega/sq) |
| Example 1 | 5×1013 | 5×1015 |
| Example 2 | 9×1014 | 3×1015 |
| Example 3 | 12×1014 | 1.5×1015 |
| Example 4 | 7×1014 | 2.5×1015 |
| Example 5 | 4.5×1014 | 4.5×1015 |
| Example 6 | 9×1014 | 2×1015 |
| Example 7 | 11×1014 | 2.5×1015 |
| Common insulating paper of same batch | 4.5×1013 | 9×1015 |
The experimental result shows that after the common insulating paper is subjected to montmorillonite modification treatment, the volume resistivity of the common insulating paper is increased, the surface resistivity of the common insulating paper is lower, and the expectation of the common insulating paper on the resistivity of the insulating material is met. In particular, the larger the volume resistivity, the better the surface resistivity, which is advantageous for oil-paper insulation composite systems. Under the same conditions of dipping times and other preparation processes, the montmorillonite modified insulating paper with the mass ratio of the quaternary ammonium salt modified montmorillonite to the polyvinyl alcohol being 1:1 and the molar ratio of hydroxyl in the polyvinyl alcohol to glutaraldehyde being 20:1 has the best insulating property.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The preparation method of the montmorillonite modified transformer insulation paper is characterized by comprising the following steps:
(1) adding quaternary ammonium salt modified montmorillonite into water, and performing ultrasonic dispersion to obtain a quaternary ammonium salt modified montmorillonite dispersion liquid;
(2) mixing the quaternary ammonium salt modified montmorillonite dispersion liquid with a polyvinyl alcohol aqueous solution, and performing ultrasonic dispersion to obtain a first mixed solution;
(3) adding hydrochloric acid and a glutaraldehyde aqueous solution into the first mixed solution, and stirring and mixing to obtain a second mixed solution;
(4) and (3) carrying out dip coating on the common insulating paper in the second mixed solution, or coating the second mixed solution on the surface of the common insulating paper by adopting an LB (Langmuir-Blodgett) coating technology or a spin coating technology, and repeating the coating process for 4-8 times to obtain the montmorillonite modified transformer insulating paper.
2. The method according to claim 1, wherein in the step (1), the mass fraction of the quaternary ammonium salt modified montmorillonite in the quaternary ammonium salt modified montmorillonite dispersion liquid is 0.5-10%.
3. The method according to claim 1, wherein in step (1), the quaternary ammonium salt is cetyltrimethylammonium bromide or octadecyltrimethylammonium bromide.
4. The method of claim 1, wherein in step (1), the preparation method of the quaternary ammonium salt modified montmorillonite comprises the following steps:
[1] adding sodium-based montmorillonite into water, and performing ultrasonic dispersion to obtain a sodium-based montmorillonite dispersion liquid;
[2] and adjusting the pH value of the sodium-based montmorillonite dispersion liquid to 5-6, adding quaternary ammonium salt, heating and stirring, carrying out suction filtration and washing on obtained precipitates after the reaction is finished, and drying to obtain the quaternary ammonium salt modified montmorillonite.
5. The method according to claim 4, wherein in the step [1], the mass fraction of the Na-montmorillonite in the Na-montmorillonite dispersion liquid is 0.5-10%.
6. The method according to claim 4, wherein in step [2], the pH is adjusted with acetic acid.
7. The method according to claim 4, wherein in the step [2], the dosage ratio of the sodium montmorillonite to the quaternary ammonium salt is 10g (5-15) mmol.
8. The method according to claim 4, wherein in the step [2], the heating temperature is 85 to 95 ℃ and the stirring time is 1 to 3 hours.
9. The method according to claim 1, wherein in the step (2), the mass concentration of the polyvinyl alcohol aqueous solution is 0.5-10%, and the mass ratio of the quaternary ammonium salt modified montmorillonite to the polyvinyl alcohol is 1 (0.5-2).
10. The method according to claim 1, wherein in the step (3), the mass concentration of the aqueous solution of glutaraldehyde is 10-50%, the molar ratio of HCl in hydrochloric acid to glutaraldehyde is 1 (2-6), and the molar ratio of hydroxyl in polyvinyl alcohol to glutaraldehyde is (10-20): 1.
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| CN112759782A (en) * | 2021-01-06 | 2021-05-07 | 清华大学 | Heat-conducting insulating material and method for improving insulating and heat-conducting properties of material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112759782A (en) * | 2021-01-06 | 2021-05-07 | 清华大学 | Heat-conducting insulating material and method for improving insulating and heat-conducting properties of material |
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| CN112111995B (en) | 2021-10-15 |
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