CN113871113A - Method for forming coating nonlinear conductive basin-type insulator - Google Patents
Method for forming coating nonlinear conductive basin-type insulator Download PDFInfo
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- CN113871113A CN113871113A CN202111097496.5A CN202111097496A CN113871113A CN 113871113 A CN113871113 A CN 113871113A CN 202111097496 A CN202111097496 A CN 202111097496A CN 113871113 A CN113871113 A CN 113871113A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 90
- 238000000576 coating method Methods 0.000 title claims abstract description 90
- 239000012212 insulator Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003822 epoxy resin Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 11
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims abstract description 3
- 229920005989 resin Polymers 0.000 claims abstract description 3
- 238000005507 spraying Methods 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 239000004952 Polyamide Substances 0.000 claims description 8
- 229920002647 polyamide Polymers 0.000 claims description 8
- 235000019441 ethanol Nutrition 0.000 claims description 4
- 238000010041 electrostatic spinning Methods 0.000 claims description 3
- 238000007590 electrostatic spraying Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000004841 bisphenol A epoxy resin Substances 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 238000009776 industrial production Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 239000011247 coating layer Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 claims 1
- 238000005498 polishing Methods 0.000 claims 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 12
- 239000007921 spray Substances 0.000 description 12
- 239000000306 component Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 230000005684 electric field Effects 0.000 description 7
- 239000007787 solid Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000012799 electrically-conductive coating Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/04—Treating the surfaces, e.g. applying coatings
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- Insulating Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a method for forming a coating nonlinear conductive basin-type insulator. The method comprises the following specific steps: preparing a nonlinear conductive coating, namely preparing an epoxy resin matrix, a curing agent and silicon carbide powder according to a resin system: the mass ratio of the silicon carbide is 100: x, wherein the value range of x is 30-90, and the x is added into a vacuum mixing tank and uniformly stirred; constructing a nonlinear conductive coating; and finally, pouring the basin-type insulator matrix. Compared with the prior art that the insulator is poured firstly and then the coating is sprayed, the method has the advantages of higher coating strength, better stability and smoother surface.
Description
Technical Field
The invention belongs to the technical field of basin-type insulator preparation, and particularly relates to a method for forming a coating nonlinear conductive basin-type insulator.
Background
The basin-type insulator is a core component of a gas insulated metal enclosed switch (GIS) and a gas insulated transmission pipeline (GIL) and plays roles of electrical insulation, mechanical support and gas isolation. With the rapid development of the high-voltage direct-current transmission technology, the application requirements of the direct-current GIS and the direct-current GIL are increasingly urgent. As the insulation reliability of the gas-solid interface of the basin-type insulator under the long-term action of direct current voltage has a serious problem, no direct current GIS or GIL engineering application report exists in China so far. The nonlinear conductive material is a novel insulating material with the conductivity increasing along with the increase of the electric field intensity, and has the function of adaptively controlling the distribution of the surface electric field of the basin-type insulator under the complex working condition.
Disclosure of Invention
The invention provides a method for forming a coating nonlinear conductive basin-type insulator, which remarkably inhibits electric field distortion and improves the insulating property of a gas-solid interface by constructing a nonlinear conductive coating on the surface of the basin-type insulator. The invention takes a scaled basin-type insulator as a model, and aims to provide a method for forming a coating nonlinear conductive basin-type insulator, so that the gas-solid interface insulation reliability of a direct current GIS and a GIL is improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for forming a coating nonlinear conductive basin-type insulator.
The method comprises the following specific steps:
preparation of non-linear conductive paint
Adding an epoxy resin matrix, a curing agent and silicon carbide powder into a vacuum mixing tank according to a certain mass ratio (a resin system: silicon carbide is 100: x, wherein the value of x ranges from 30 to 90), and fully stirring to uniformly disperse all components; adding a proper amount of absolute ethyl alcohol or acetone, and then stirring again to maintain the viscosity of the coating at 20-40 din.
Second, construction of nonlinear conductive coating
a) Wiping the surface of the basin-type insulator mold with alcohol, and uniformly coating a small amount of release agent; the non-sprayed area of the mold is covered with cardboard or the like and placed in a 100 ℃ constant temperature oven for a pre-heat treatment for more than 2 hours.
b) Utilizing a spraying device shown in the attached figure 1(a) to construct a coating on the surface of a basin-type insulator mold: firstly, adding the nonlinear conductive coating in the first step into a storage tank, then horizontally placing the preheated mold under a nozzle, finally opening a device switch to introduce high-speed airflow, atomizing the coating at the nozzle position, and spraying out to form a coating with uniform thickness on the surface of the mold. It is worth mentioning that the thickness of the coating is related to the spraying time, the spraying flow rate, the height of the nozzle from the surface of the mold, etc., and can be adjusted automatically according to the needs.
The spraying flow or the spraying time meets the following conditions:
d×πR2＝Q×t (1)
wherein: r, radius of a circular spraying area; d, layer thickness; q, spraying flow rate; and t, spraying time.
c) And (3) putting the sprayed mould into an oven with the temperature of 100 ℃ for heat treatment for 1 hour, fully evaporating redundant alcohol or acetone, and curing the coating to a gel state.
Three, basin type insulator base body pouring
Taking out the two half basin-type insulator molds processed in the second step, closing the molds, and vertically placing the molds under a vacuum casting tank as shown in the attached drawing 1 (b); according to the industrial production flow, the uniformly mixed mixture of the epoxy resin (CT5531), the curing agent (HY 5531-1) and the aluminum oxide (12 mu m) is poured into a mould and cured for 12 hours at 130 ℃; taking the primarily cured coating nonlinear conductive insulator out of the mold, and secondarily curing for 16 hours at 130 ℃; after the insulator returns to the room temperature, the residual release agent on the surface of the insulator is removed by alcohol, redundant gates are sawed off and polished smoothly, and finally the coating nonlinear conductive insulator with uniform thickness and smooth surface is obtained, as shown in figure 2.
The coating can be formed on the surface of the basin-type insulator die by brushing, electrostatic spinning or electrostatic spraying.
Advantageous effects
1. The basin-type insulator manufactured by the invention is integrally cured and molded with the nonlinear conductive coating, and has extremely high interface bonding strength. After twenty cold and hot impact tests, no crack defects were observed on the coating surface by means of the infiltration method.
2. The coating nonlinear conductive basin-type insulator manufactured by the invention can obviously reduce the electric field intensity of the space along and around the insulator and can improve the insulation reliability of the gas-solid interface of the direct current GIS and GIL.
Drawings
Fig. 1 is a schematic diagram of a spraying device and a pouring device for a nonlinear electrical conducting basin-type insulator.
Fig. 2 shows the formed coated nonlinear electrical conductor insulator: a-front side, b-back side.
Fig. 3 shows the bulk conductivity of the nonlinear electrically conductive coating material.
Fig. 4 shows the insulator surface electric field distribution: a-a convex surface; b-a concave surface.
Fig. 5 shows the dc flashover voltage of the insulator.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Example 1
1. Preparing the coating: adding bisphenol A type epoxy resin (E44), polyamide curing agent (TY651) and silicon carbide powder (12 mu m, alpha type) into a vacuum mixing tank according to the mass ratio of 67:33:30, and stirring for 0.5 hour to uniformly disperse the components; adding a proper amount of absolute ethyl alcohol, and then stirring for 10 minutes again to keep the viscosity of the coating at about 30din.
2. And (3) coating construction: the spray time, spray flow rate, and height of the nozzle from the mold surface are appropriately adjusted according to the desired coating thickness. The height H of the nozzle from the die is 30cm, the atomized coating is distributed most uniformly, and R is 26 cm; when the spraying flow rate Q was 500mL/min and the spraying time t was 2.5s, the coating thickness d was constructed to be 0.1 mm.
Example 2
1. Preparing the coating: adding bisphenol A type epoxy resin (E44), polyamide curing agent (TY651) and silicon carbide powder (12 mu m, alpha type) into a vacuum mixing tank according to the mass ratio of 67:33:60, and stirring for 0.5 hour to uniformly disperse the components; adding a proper amount of absolute ethyl alcohol, and then stirring for 10 minutes again to keep the viscosity of the coating at about 30din.
2. And (3) coating construction: the spray time, spray flow rate, and height of the nozzle from the mold surface are appropriately adjusted according to the desired coating thickness. The height H of the nozzle from the die is 30cm, the atomized coating is distributed most uniformly, and R is 26 cm; when the spraying flow rate Q was 500mL/min and the spraying time t was 2.5s, the coating thickness d was constructed to be 0.1 mm.
Example 3
1. Preparing the coating: bisphenol A epoxy resin (E44), polyamide curing agent (TY651) and silicon carbide powder (12 μm, type. alpha.) were mixed in the following ratio of 67: adding the materials into a vacuum mixing tank according to the mass ratio of 33:90, and stirring for 0.5 hour to uniformly disperse the components; adding a proper amount of absolute ethyl alcohol, and then stirring for 10 minutes again to keep the viscosity of the coating at about 30din.
2. And (3) coating construction: the spray time, spray flow rate, and height of the nozzle from the mold surface are appropriately adjusted according to the desired coating thickness. The height H of the nozzle from the die is 30cm, the atomized coating is distributed most uniformly, and R is 26 cm; when the spraying flow rate Q was 500mL/min and the spraying time t was 2.5s, the coating thickness d was constructed to be 0.1 mm.
Example 4
1. Preparing the coating: adding bisphenol A type epoxy resin (E44), polyamide curing agent (TY651) and silicon carbide powder (12 mu m, alpha type) into a vacuum mixing tank according to the mass ratio of 75:25:30, and stirring for 0.5 hour to uniformly disperse the components; adding a proper amount of absolute ethyl alcohol, and then stirring for 10 minutes again to keep the viscosity of the coating at about 30din.
2. And (3) coating construction: the spray time, spray flow rate, and height of the nozzle from the mold surface are appropriately adjusted according to the desired coating thickness. The height H of the nozzle from the die is 30cm, the atomized coating is distributed most uniformly, and R is 26 cm; when the spraying flow rate Q was 500mL/min and the spraying time t was 2.5s, the coating thickness d was constructed to be 0.1 mm.
Example 5
1. Preparing the coating: adding bisphenol A type epoxy resin (E44), polyamide curing agent (TY651) and silicon carbide powder (12 mu m, alpha type) into a vacuum mixing tank according to the mass ratio of 75:25:60, and stirring for 0.5 hour to uniformly disperse the components; adding a proper amount of absolute ethyl alcohol, and then stirring for 10 minutes again to keep the viscosity of the coating at about 20din.
2. And (3) coating construction: the spray time, spray flow rate, and height of the nozzle from the mold surface are appropriately adjusted according to the desired coating thickness. The height H of the nozzle from the die is 30cm, the atomized coating is distributed most uniformly, and R is 26 cm; when the spraying flow rate Q was 500mL/min and the spraying time t was 2.5s, the coating thickness d was constructed to be 0.1 mm.
Example 6
1. Preparing the coating: adding bisphenol A type epoxy resin (E44), polyamide curing agent (TY651) and silicon carbide powder (12 mu m, alpha type) into a vacuum mixing tank according to the mass ratio of 75:25:90, and stirring for 0.5 hour to uniformly disperse the components; adding a proper amount of absolute ethyl alcohol, and then stirring for 10 minutes again to keep the viscosity of the coating at about 40din.
2. And (3) coating construction: the spray time, spray flow rate, and height of the nozzle from the mold surface are appropriately adjusted according to the desired coating thickness. The height H of the nozzle from the die is 30cm, the atomized coating is distributed most uniformly, and R is 26 cm; when the spraying flow rate Q was 500mL/min and the spraying time t was 2.5s, the coating thickness d was constructed to be 0.1 mm.
Fig. 3 shows the bulk conductivity of nonlinear conductive coating materials at various silicon carbide additions (x 30,60, 90);
figure 4 shows the distribution of the electric field along the surface around a conventional insulator and a corresponding coated nonlinear electrically conductive insulator.
It can be seen that after the coating nonlinear conductive insulator is adopted, the maximum value of the surface electric field of the insulator is reduced to 0.62kV/mm from 1.15kV/mm, and the reduction amplitude is nearly 50%.
Fig. 5 shows the dc flashover voltage of a conventional insulator and a coated insulator in air.
It can be seen that after the coating nonlinear conductive basin-type insulator is adopted, the flashover voltage of the insulator along the surface is increased from 30kV to 37.1kV, and the increase amplitude is about 24%.
Example 7
Preparing the coating: adding bisphenol A type epoxy resin (E44), polyamide curing agent (TY651) and silicon carbide powder (12 mu m, alpha type) into a vacuum mixing tank according to the mass ratio of 75:25:90, and stirring for 0.5 hour to uniformly disperse the components; adding a proper amount of absolute ethyl alcohol, and then stirring for 10 minutes again to keep the viscosity of the coating at about 40din.
The brush coating is selected to construct a coating on the surface of the basin-type insulator mold.
Example 8
The electrostatic spinning can be selected as the method for constructing the coating on the surface of the basin-type insulator die, and other steps are the same as those in the embodiment 7.
Example 9
The electrostatic spraying can be selected as the method for constructing the coating on the surface of the basin-type insulator mold, and other steps are the same as those in the embodiment 7.
The innovation point of the invention is that firstly, a coating is made on the mould, and then the insulator is poured. Compared with the prior art that the insulator is poured firstly and then the coating is sprayed, the coating has higher strength, better stability and higher surface smoothness.
Claims (7)
1. A method for forming a coating nonlinear conductive basin-type insulator is characterized by comprising the following steps:
1) preparing a nonlinear conductive coating:
(1) mixing an epoxy resin matrix, a curing agent and silicon carbide powder according to a resin system: the mass ratio of the silicon carbide is 100: x, wherein the value range of x is 30-90, and the x is added into a vacuum mixing tank;
(2) fully stirring to ensure that all components are uniformly dispersed;
(3) adding absolute ethyl alcohol or acetone, and then stirring again to maintain the viscosity range of the coating at 20-40 din.s;
2) constructing a nonlinear conductive coating:
(1) wiping the surface of the basin-type insulator mold clean, and uniformly coating a small amount of release agent;
(2) covering a non-spraying area of the mold, and putting the mold into a constant-temperature oven for preheating for more than 2 hours;
(3) constructing a coating on the surface of the basin-type insulator mold;
(4) putting the coated mould into an oven for heat treatment, fully evaporating redundant alcohol or acetone, and curing the coating to a gel state;
3) pouring the basin-type insulator matrix:
(1) taking out the two half basin-type insulator molds processed in the step 2), closing the molds, and vertically placing the molds under a vacuum casting tank;
(2) carrying out twice curing operations according to the industrial production flow;
(3) and after the insulator returns to the room temperature, removing the residual release agent on the surface of the insulator, sawing off redundant gates and polishing the gates smoothly to finally obtain the coating nonlinear conductive insulator with uniform thickness and smooth surface.
2. The method of claim 1, wherein the epoxy resin matrix and the curing agent are preferably bisphenol a epoxy resin (E44) and polyamide curing agent (TY651), respectively, and preferably in a ratio of 75: 25.
3. the method for forming a coated nonlinear electrical conducting basin-type insulator as claimed in claim 1, wherein the steps 2-3) are carried out by constructing a coating on the surface of a basin-type insulator mold by selecting an air spraying method:
firstly, adding the nonlinear conductive coating in the step 1) into a storage tank, then horizontally placing the preheated mold under a nozzle, finally opening a device switch to introduce high-speed airflow, atomizing the coating at the position of the nozzle, and spraying out the coating to form a coating with uniform thickness on the surface of the mold.
4. A method according to claim 3, wherein the nozzle is preferably 30cm from the die height, where the atomized coating is most evenly distributed and the radius R of the circular area is 26 cm.
5. The method for forming a coated nonlinear electrical conducting basin-type insulator according to claim 3, wherein the flow rate or spraying time of the spraying satisfies the following conditions:
d×πR2＝Q×t (1)
wherein: r, radius of a circular spraying area; d, layer thickness; q, spraying flow rate; and t, spraying time.
6. The method as claimed in claim 5, wherein the thickness d of the coating layer is 0.1mm when the spraying flow rate Q is 500mL/min and the spraying time t is 2.5 s.
7. The method for forming a coated nonlinear electrical conducting basin insulator as claimed in claim 1, wherein the coating is formed on the surface of the basin insulator mold in steps 2-3 by brushing, electrostatic spinning or electrostatic spraying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111097496.5A CN113871113B (en) | 2021-09-18 | 2021-09-18 | Forming method of coating nonlinear electric conduction basin-type insulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111097496.5A CN113871113B (en) | 2021-09-18 | 2021-09-18 | Forming method of coating nonlinear electric conduction basin-type insulator |
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| CN113871113A true CN113871113A (en) | 2021-12-31 |
| CN113871113B CN113871113B (en) | 2024-01-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115050526A (en) * | 2022-06-06 | 2022-09-13 | 清华大学 | Pouring method of layered structure basin-type insulator |
| CN117116576A (en) * | 2023-06-06 | 2023-11-24 | 武汉大学 | Method and device for preparing high-conductivity nonlinear coefficient coating induced by in-situ electric field |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540225A (en) * | 2009-03-24 | 2009-09-23 | 西安交通大学 | Method for preparing silicon rubber insulator super-hydrophobicity surface |
| CN107403672A (en) * | 2017-08-08 | 2017-11-28 | 芜湖市凯鑫避雷器有限责任公司 | A kind of production method of hollow silicon rubber composite insulator |
| US20190144703A1 (en) * | 2016-06-20 | 2019-05-16 | Mitsubishi Electric Corporation | Coating material, coating film, and gas insulated switchgear |
-
2021
- 2021-09-18 CN CN202111097496.5A patent/CN113871113B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540225A (en) * | 2009-03-24 | 2009-09-23 | 西安交通大学 | Method for preparing silicon rubber insulator super-hydrophobicity surface |
| US20190144703A1 (en) * | 2016-06-20 | 2019-05-16 | Mitsubishi Electric Corporation | Coating material, coating film, and gas insulated switchgear |
| CN107403672A (en) * | 2017-08-08 | 2017-11-28 | 芜湖市凯鑫避雷器有限责任公司 | A kind of production method of hollow silicon rubber composite insulator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115050526A (en) * | 2022-06-06 | 2022-09-13 | 清华大学 | Pouring method of layered structure basin-type insulator |
| CN117116576A (en) * | 2023-06-06 | 2023-11-24 | 武汉大学 | Method and device for preparing high-conductivity nonlinear coefficient coating induced by in-situ electric field |
| CN117116576B (en) * | 2023-06-06 | 2024-03-22 | 武汉大学 | Method and device for preparing high-conductivity nonlinear coefficient coating induced by in-situ electric field |
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