CN1604237A - vacuum insulator coating capable of increasing flashover voltage and method of preparation thereof - Google Patents
vacuum insulator coating capable of increasing flashover voltage and method of preparation thereof Download PDFInfo
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Abstract
This invention relates to a vacuum isolation sub-coating and its process to improve the surface flashover voltage, wherein, the coating is composed of epoxide resin, aluminum hydroxide, modified synthesized amine firming agent, butyl epihydrin aether thinner. The process comprises the steps of materials, bacon, vacuum, mixture, heating and solidifying and cooling and demoulding Comparing with current material, the coating in this invention has higher surface flashover voltage and high flash burn endurance.
Description
Technical field:
The invention belongs to vacuum high-pressure insulation technology field, relate to a kind of vacuum insulator coating and preparation technology who improves edge flashing voltage.
Background technology:
Insulator is adopted in various power equipments and many modern vacuum devices in a large number, also in large-scale tip device, is applied simultaneously, and as X-ray tube, high-power microwave tubes, particle accelerators etc. play High-Voltage Insulation, vacuum seal and the fixing effect of support.Use insulator in a vacuum, exist a phenomenon: after in a vacuum gap, adding an insulator support, this insulation system is breakdown under a lower voltage, occurs in the surface of insulator, and the edge flashing that this phenomenon is called insulator punctures.That is to say that the surperficial proof voltage intensity of insulator is far below the proof voltage intensity of unidimensional vacuum gap and insulation daughter.
The edge flashing phenomenon has had a strong impact on the withstand voltage properties and the reliability of system.For example, the critical disruptive field intensity of vacuum is about 35KV/mm, and aluminium oxide ceramics is about 40KV/mm, and the edge flashing of vacuum-alumina system will take place under the electric field of several KV/mm usually.It is reported, the prionotron of the linear accelerator centre of Stanford Univ USA, the serious accident that causes owing to insulator edge flashing in the vacuum all once took place in the accelerator of USDOE, the accelerator of the high-power pulse generator of Russian national nuclear physics laboratory and Japanese high-energy physics National Laboratory.Because insulator edge flashing phenomenon has had a strong impact on the withstand voltage properties and the functional reliability of electron tube in the vacuum, restricted the raising of vacuum insulation systems electrical strength, therefore, since the sixties, the scientist of the U.S., Japan, France has dropped into great effort and funds are studied this phenomenon, the formation mechanism and the influencing factor of insulator edge flashing phenomenon in the vacuum understood in attempt, seeks to prevent the insulator edge flashing simultaneously, improves the edge flashing voltage method.But up to the present, also do not have a kind of hypothesis can ideally explain all experimental phenomenas of insulator edge flashing in the vacuum, present research has mainly concentrated on two aspects, the method for the physical mechanism of edge flashing and raising flashover voltage.In order to improve the proof voltage grade of vacuum insulator, scholar both domestic and external has done a large amount of work, such as the shielding junctional area, change insulator shape and electrode structural designs to reduce the electric field of junctional area, the angle that changes insulator is got back to insulator surface etc. to avoid secondary electron, and these technology are proved to be effective in varying degrees.But, from insulating material itself, with improve the insulator performance be means improve edge flashing voltage research but seldom.Only research concentrates on the ceramic insulator.Lack relevant data especially for organic material insulator vacuum Research on surface.
Summary of the invention
At above-mentioned prior art situation, the object of the invention provides and a kind ofly can improve insulation property, can control cost and simplify the approach of edge flashing problem of the solution vacuum insulator simple, with low cost of technology again.
Result of study shows, reduce the vacuum insulator surface resistivity or improve the vacuum insulator surface conductivity, help flowing of positive charge that secondary stays later on, thereby reduction space electric field, reduce the emission of field-causing electron and secondary electron, to a certain degree can improve edge flashing voltage.While is owing to the vacuum insulator bulk material is alternative limited, existing material exists variety of problems again, consider the operability of technology, simplicity, the control of cost, and the restriction of domestic large-scale vacuum insulator working ability, therefore, amid all these factors, the technical solution that the present invention improves the edge flashing magnitude of voltage is not a development of new insulator body material, but adopt the way that covers one deck coating material at original insulator surface, can reduce the vacuum insulator surface resistivity or improve the coating material that surface conductivity improves edge flashing voltage thereby at first seek, the preparation technology of this coating is provided then.
According to the foregoing invention design, the selection of coating material must be satisfied following several standards: 1, compare with bulk material, have higher edge flashing magnitude of voltage.2, have the ability that anti-electric arc burns, can resist the branch discharge, experience repeatedly after the flashover discharge, insulation property do not descend.3, satisfactory mechanical property, easily processing and fabricating.With the bulk material strong adhesion, incrust.4, with low cost.
The present invention can improve the vacuum insulator coating of edge flashing magnitude of voltage, that can directly pour into a mould, with low cost, adhesion-tight and thermoplastics type's material satisfactory mechanical property of employing and can improve anti-electric trace material and the curing agent that is used, diluent, it is characterized in that: the described vacuum insulator coating that improves the edge flashing magnitude of voltage is made up of epoxy resin, aluminium hydroxide, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent; Its mass percent is: epoxy resin 20%～62.5%; Aluminium hydroxide 0%～60%; The synthesizing aminated curing agent 13%～37.5% of modification: butyl glycidyl ether class diluent 0%～6.6%.
Described epoxy resin is meant viscosity≤2.5, and epoxide equivalent is 185～208 (g/mol), and epoxide number 0.48～0.54 (mol/100g), normal temperature are liquid epoxy resin down; Described aluminium hydroxide be meant through coupling agent treatment, the aluminium-hydroxide powder of particle diameter between 2 μ m～3 μ m; Described through coupling agent treatment, particle diameter is after the aluminium-hydroxide powder between 2 μ m～3 μ m is meant that coupling agent solution with aluminium-hydroxide powder quality 0.05% joins aluminium hydrate powder, put into 70～90 ℃ water-bath, stirred 2～3 hours, put into baking oven again, 80～120 ℃ of oven dry; Described through coupling agent treatment, the aluminium-hydroxide powder of particle diameter between 2 μ m～3 μ m be meant can also be directly be 100: 5: 0.1 ratio preparation in quality with aluminium-hydroxide powder, ethanol, coupling agent, put baking oven into, 80～120 ℃ of oven dry after fully stirring.
The present invention can improve the preparation technology of the vacuum insulator coating of edge flashing magnitude of voltage, it is characterized in that: may further comprise the steps:
Step 1, with epoxy resin, aluminium-hydroxide powder, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent by mass percentage 20%～62.5%: 0%～60%: 13%～37.5%: 0%～6.6% proportioning get the raw materials ready;
Step 2, will be by the load weighted epoxy resin of proportioning, synthesizing aminated curing agent of modification and butyl glycidyl ether class diluent are put into baking oven respectively and were heated 20 minutes down at 50～70 ℃, put into vacuum drying chamber then and under-0.001Mpa (vacuum degree 100), vacuumized 30～60 minutes, remove moisture and bubble in the raw material;
Step 4, bubble-free raw material is molded in all kinds of vacuum insulator moulds to heat up down at 80～120 ℃ solidified 1～3 hour;
Step 5, be cooled to room temperature, the demoulding is taken out, and carries out the test of surface resistivity and edge flashing magnitude of voltage.
Effect of the present invention:
By coating material, improved the surface conductivity of vacuum organic material insulator effectively, thereby improved edge flashing voltage.Added the epoxy resin of aluminium hydroxide and compared, improved more than 30% with pure epoxy.Its flashover voltage value has surpassed nylon commonly used, polymethyl methacrylate.Epoxy resin is good insulating material, with low cost and satisfactory mechanical property.Because epoxy resin is thermoplastics type's material, can cast directly on the surface of vacuum insulator bulk material adhesion-tight.Add hydrated alumina (aluminium hydroxide) to epoxy resin, can make insulator surface have certain transient state conductivity, thereby discharge the positive charge of surface deposition, perhaps improve the uniformity of the CHARGE DISTRIBUTION of insulator surface, suppressed the dendroid damage to a certain extent.Add the aluminium-hydroxide powder that contains the crystallization water, can improve the anti-electric trace of material effectively, the effect of aluminium hydroxide, the one, under discharge process, cause interior oxidizing process, the free charcoal that produces in the discharge is oxidized to fluid carbon.Thereby dispose charcoal from the teeth outwards, the Al that produces in the reaction
2O
3In oxidizing process, play catalyst.The 2nd, the high temperature during discharge makes hydrated alumina emit the crystallization water (240 °), forms strong air-flow simultaneously, washes away the carbon granule that is deposited on the material surface.Therefore, the crystallization water that contains in the filler is many more, and the souring of this air-flow is strong more, can significantly improve the anti-electric trace of material more.The 3rd, improved the thermal conductivity of material, in a vacuum, because heat radiation difficulty is an individual very important problem equally.For the consideration of cost and manufacture craft factor, in raw-material selection, all be based on home products.
Description of drawings
Fig. 1 is Al (OH)
3Content is to the coordinate diagram that influences of the surface resistivity of composite material
Wherein: abscissa is Al (OH) among Fig. 1
3Mass percent, ordinate are surface resistivity; Use KEITHLEY-6517 type megger to measure the surface conductance of sample, anchor clamps use 8009 types.To different al (OH)
3The composite material sample testing surface resistivity of content, experiment test add the ρ of the epoxy resin of aluminium hydroxide from pure epoxy resin to 60%
s, as can be seen from Figure, along with Al (OH)
3The surface resistivity of the increase composite material of content is on a declining curve, meets expected results.
The vacuum flashover voltage of table 1 customary insulation material
Relevant test brief description:
(1) surface resistivity:
According to the test of I.S.Roth, the raising of vacuum insulator surface conductivity can effectively improve edge flashing voltage.But the relation between the two is not to meet linearity.Experiment test add the ρ of the epoxy resin of aluminium hydroxide from pure epoxy resin to 60%
s, this paper uses KEITHLEY-6517 type megger to measure the surface conductance of sample, and anchor clamps use 8009 types.To different al (OH)
3The composite material sample testing surface resistivity of content (patterned surface is through sanding and polishing, ethanol scrub process).
(2) test material vacuum edge flashing magnitude of voltage:
The insulating material of the disk shape composite epoxy of diameter 10mm, thick 1mm as the creeping discharge experiment used in experiment.Earlier use alcohol wash, the two sides presses circular stainless steel electrode sheet and does electrode again, electrode slice diameter 21mm, thickness 1mm, electrode spacing 5mm.At last test product is fixed on the plastic stent, puts into experimental provision.Experiment is carried out in a vacuum chamber, utilize two vacuum pumps to vacuumize to guarantee vacuum degree 5.8E-4Pa, experimental voltage is by high-voltage probe (Tektronix P6015A, bandwidth 75MHz) sends into digital oscilloscope (LeCroyLC574AM after the sampling, bandwidth 1GHz, unitary sampling 2GS/s) the pulse voltage wave mode is a lightning wave.Rising edge 400ns, wave rear 6ms.Sample pressurization is generally begun each electric pressure from 5kv apply 10 times, the about 2kV of the amplitude of at every turn boosting is up to the flashover first time takes place.Taking place for the first time in the test, the magnitude of voltage of flashover is called flashover voltage V first
Bd(First breakdown voltage); The flashover voltage of the process of boosting when flashovers take place continuous three pressurizations of appearance is called as experienced voltage value V
Co(conditioned voltage); Voltage when 4～6 flashover phenomenons occurring in 10 duplicate tests is called 50% flashover voltage V
50%Sample has the nylon that is usually used in the vacuum insulator material, polyurethane, PE (polyethylene), PMMA (polymethyl methacrylate), pure epoxy and added the epoxy of the aluminium hydroxide of different proportion.This shows that with common used material, nylon, polymethyl methacrylate, pure epoxy resin is compared, the epoxy resin that has added aluminium hydroxide all is improved to some extent on the seasoned flashover voltage at flashover voltage first.Reached the same flashover voltage value of polyurethane material and polyethylene.
(3) tracking test:
The test method of Chang Yong anti creepage trace and galvanic corrosion has in the world: drip method, inclined plane method, squirrel wheel method, cloud method and saline fog method.What this test was adopted is inclined plane method, tests according to GB 6553-86, is equal to IEC IEC587 (1984).Standard code two kinds of test methods: the constant-voltage method and the method for boosting step by step.The method of boosting is one by one adopted in this test.
The rank of the anti creepage trace of table 2. material
| Material | Anti-electric rank |
| Pure epoxy resin | ?? |
| 40% adds epoxy | ?? |
| 60% adds epoxy | ??2B3.75kv |
The epoxy resin of aluminium hydroxide has been added in evidence, and the ability that its tolerance electric arc burns greatly improves, and can be lower than the branch discharge of insulator surface effectively.
Embodiment
The present invention selects following coating material for use in concrete enforcement:
(1) epoxy resin: the WSR618 that Wuxi resin processing plant produces.Epoxide equivalent is 185～208 (g/mol), epoxide number 0.48～0.54 (mol/100g), and chemical formula is as follows:
(2) curing agent: the Wuxi WSR--H023 of research institute of resin processing plant.。WSR-H023 is that its viscosity is low, the color and luster water white transparency by the synthetic epoxy curing agent of special amine modification, and the drug-resistant performance is good, be applicable to no-solvent type coating and casting, bonding usefulness, but operating period is long, and its rerum natura that is heating and curing is better.Chemical formula is as follows:
(3) diluent: 501 of Shanghai Resin Factory's production.Its main component is a butyl glycidyl ether, and its molecular formula is:
(4) aluminium hydroxide: go up marine products, particle diameter is between 2.00 μ m～3.00 μ m.In order to improve the dispersion of nano-particles degree, improve the surface activity of example, improve the compatibility between particle and the basis material, with the KH-560 type silane coupler that coupling agent factory in East China produces it is handled.
Above-mentioned coating material is specifically implemented in conjunction with preparation technology by different proportionings respectively.
Embodiment 1: concrete preparation technology may further comprise the steps:
1, with epoxy resin, aluminium-hydroxide powder, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent 66%: 20%: 13% by mass percentage: 0% batching.
2, will be by the load weighted epoxy resin of proportioning, synthesizing aminated curing agent of modification and butyl glycidyl ether class diluent are put into baking oven respectively and were heated 20 minutes down at 50 ℃, put into then under vacuum drying chamber-0.001Mpa (vacuum degree 100) and vacuumized 30 minutes, remove moisture and bubble in the raw material;
3, the synthesizing aminated curing agent of epoxy resin and modification is mixed, slowly add aluminium-hydroxide powder and butyl glycidyl ether class diluent up to fully mixed while stir; After 30 minutes, put into 50 ℃ of heating of baking oven 20 minutes with the electric mixer stirring.Under-0.001Mpa (vacuum degree 100), vacuumized 30 minutes once more, take out then and get rid of supernatant bubble;
4, bubble-free raw material is molded in all kinds of vacuum insulator moulds 80 ℃ of curing 2 hours that heat up down;
5, be cooled to room temperature, the demoulding is taken out, and carries out the test of surface resistivity and edge flashing magnitude of voltage.
Embodiment 2:
1, with epoxy resin, aluminium-hydroxide powder, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent 50%: 30%: 15% by mass percentage: 5% batching.
2, will be by the load weighted epoxy resin of proportioning, synthesizing aminated curing agent of modification and butyl glycidyl ether class diluent are put into baking oven respectively and were heated 20 minutes down at 60 ℃, put into vacuum drying chamber then and under-0.001Mpa (vacuum degree 100), vacuumized 60 minutes, remove moisture and bubble in the raw material;
3, the synthesizing aminated curing agent of epoxy resin and modification is mixed, slowly add aluminium-hydroxide powder and butyl glycidyl ether class diluent up to fully while stir; After 50 minutes, put into 60 ℃ of heating of baking oven 20 minutes with the electric mixer stirring.Under-0.001Mpa (vacuum degree 100), vacuumized 60 minutes once more, take out then and get rid of supernatant bubble;
4, bubble-free raw material is molded in all kinds of vacuum insulator moulds, heats up and solidify: 80 ℃/2 hours+100 ℃/2 hours;
5, be cooled to room temperature, the demoulding is taken out, and carries out the test of surface resistivity and edge flashing magnitude of voltage.
Embodiment 3:
1, with epoxy resin, aluminium-hydroxide powder, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent 20%: 60%: 13.3% by mass percentage: 6.6% batching.
2, will be by the load weighted epoxy resin of proportioning, synthesizing aminated curing agent of modification and butyl glycidyl ether class diluent are put into baking oven respectively and were heated 20 minutes down at 60 ℃, put into vacuum drying chamber then and under-0.001Mpa (vacuum degree 100), vacuumized 60 minutes, remove moisture and bubble in the raw material;
3, the synthesizing aminated curing agent of epoxy resin and modification is mixed, slowly add aluminium-hydroxide powder and butyl glycidyl ether class diluent up to fully while stir; After 60 minutes, put into 60 ℃ of heating of baking oven 20 minutes with the electric mixer stirring.Under-0.001Mpa (vacuum degree 100), vacuumized 60 minutes once more, take out then and get rid of supernatant bubble;
4, repeating step three once after 60 minutes, is put into 60 ℃ of heating of baking oven 20 minutes with the electric mixer stirring.Under-0.001Mpa (vacuum degree 100), vacuumized 60 minutes once more, take out then and get rid of supernatant bubble;
5, bubble-free raw material is molded in all kinds of vacuum insulator moulds, heats up and solidify: 80 ℃/2 hours+120 ℃/2 hours.
6, be cooled to room temperature, the demoulding is taken out, and carries out the test of surface resistivity and edge flashing magnitude of voltage.
Claims (9)
1, can improve the vacuum insulator coating of edge flashing voltage, adopt thermoplastics type's material, anti-electric trace material and curing agent, diluent, it is characterized in that: the described vacuum insulator coating that improves the edge flashing magnitude of voltage is made up of epoxy resin, aluminium hydroxide, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent; Its mass percent is: epoxy resin 20%～62.5%; Aluminium hydroxide 0%～60%; The synthesizing aminated curing agent 13%～37.5% of modification: butyl glycidyl ether class diluent 0%～6.6%.
2, the vacuum insulator coating that improves the edge flashing magnitude of voltage according to claim 1, it is characterized in that: described epoxy resin is meant viscosity≤2.5, epoxide equivalent is 185～208 (g/mol), and epoxide number 0.48～0.54 (mol/100g), normal temperature are liquid epoxy resin down.
3, the vacuum insulator coating that improves the edge flashing magnitude of voltage according to claim 1 is characterized in that: described aluminium hydroxide be meant through coupling agent treatment, the aluminium-hydroxide powder of particle diameter between 2 μ m～3 μ m;
4, the vacuum insulator coating that improves the edge flashing magnitude of voltage according to claim 3, it is characterized in that: described through coupling agent treatment, particle diameter is after the aluminium-hydroxide powder between 2 μ m～3 μ m is meant that coupling agent solution with aluminium-hydroxide powder quality 0.05% joins aluminium hydrate powder, put in 70～90 ℃ the water-bath, stirred 2～3 hours, put into baking oven again, 80～120 ℃ of products of drying and obtaining.
5, the vacuum insulator coating that improves the edge flashing magnitude of voltage according to claim 3, it is characterized in that: described through coupling agent treatment, the aluminium-hydroxide powder of particle diameter between 2 μ m～3 μ m be meant can also be directly be 100: 5: 0.1 ratio preparation in quality with aluminium-hydroxide powder, ethanol, coupling agent, put baking oven into after fully stirring, 80～120 ℃ of products of drying and obtaining.
6, a kind of vacuum insulator preparation technology of coating that improves the edge flashing magnitude of voltage according to claim 1 is characterized in that: may further comprise the steps:
Step 1, with epoxy resin, aluminium-hydroxide powder, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent by mass percentage 20%～62.5%: 0%～60%: 13%～37.5%: 0%～6.6% proportioning get the raw materials ready.
Step 2, will be by the load weighted epoxy resin of proportioning, synthesizing aminated curing agent of modification and butyl glycidyl ether class diluent are put into baking oven respectively and were heated 20 minutes down at 50～70 ℃, put into vacuum drying chamber then and under-0.001Mpa (vacuum degree 100), vacuumized 30～60 minutes, remove moisture and bubble in the raw material;
Step 3, the synthesizing aminated curing agent of epoxy resin and modification is mixed, slowly add aluminium-hydroxide powder and butyl glycidyl ether class diluent up to mixing fully while stir; After 30～60 minutes, put into 50～70 ℃ of heating of baking oven 20 minutes with the electric mixer stirring.Under-0.001Mpa, vacuumized 30～60 minutes once more, take out then and get rid of supernatant bubble; In case of necessity, repeat above step 1～2 time.
Step 4, bubble-free raw material is molded in all kinds of vacuum insulator moulds to heat up down at 80～120 ℃ solidified 1～3 hour;
Step 5, be cooled to room temperature, the demoulding is taken out, and carries out the test of surface resistivity and edge flashing magnitude of voltage.
7, the vacuum insulator preparation technology of coating that improves the edge flashing magnitude of voltage according to claim 6 is characterized in that: concrete preparation technology is following steps:
Step 1, with epoxy resin, aluminium-hydroxide powder, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent 62.5%: 20%: 13% by mass percentage: 0% batching.
Step 2, will be by the load weighted epoxy resin of proportioning, synthesizing aminated curing agent of modification and butyl glycidyl ether class diluent are put into baking oven respectively and were heated 20 minutes down at 50 ℃, put into then and vacuumized under vacuum drying chamber-0.001Mpa 30 minutes, remove moisture and bubble in the raw material;
Step 3, the synthesizing aminated curing agent of epoxy resin and modification is mixed, slowly add aluminium-hydroxide powder and butyl glycidyl ether class diluent up to fully mixed while stir; After 30 minutes, put into 50 ℃ of heating of baking oven 20 minutes with the electric mixer stirring.Under-0.001Mpa, vacuumized 30 minutes once more, take out then and get rid of supernatant bubble;
Step 4, bubble-free raw material is molded in all kinds of vacuum insulator moulds to heat up down at 80 ℃ solidified 2 hours;
Step 5, be cooled to room temperature, the demoulding is taken out, and carries out the test of surface resistivity and edge flashing magnitude of voltage.
8, the vacuum insulator preparation technology of coating that improves the edge flashing magnitude of voltage according to claim 6 is characterized in that: concrete preparation technology also can be following steps:
Step 1, with epoxy resin, aluminium-hydroxide powder, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent 50%: 30%: 15% by mass percentage: 5% batching.
Step 2, will be by the load weighted epoxy resin of proportioning, synthesizing aminated curing agent of modification and butyl glycidyl ether class diluent are put into baking oven respectively and were heated 20 minutes down at 60 ℃, put into vacuum drying chamber then and under-0.001Mpa, vacuumized 60 minutes, remove moisture and bubble in the raw material;
Step 3, the synthesizing aminated curing agent of epoxy resin and modification is mixed, slowly add aluminium-hydroxide powder and butyl glycidyl ether class diluent up to fully while stir; After 50 minutes, put into 60 ℃ of heating of baking oven 20 minutes with the electric mixer stirring.Under-0.001Mpa, vacuumized 60 minutes once more, take out then and get rid of supernatant bubble;
Step 4, bubble-free raw material is molded in all kinds of vacuum insulator moulds, heats up and solidify: 80 ℃/2 hours;
Step 5, be cooled to room temperature, the demoulding is taken out, and carries out the test of surface resistivity and edge flashing magnitude of voltage.
9, the vacuum insulator preparation technology of coating that improves the edge flashing magnitude of voltage according to claim 6 is characterized in that: concrete preparation technology also can be following steps:
Step 1, with epoxy resin, aluminium-hydroxide powder, the synthesizing aminated curing agent of modification, butyl glycidyl ether class diluent 20%: 60%: 13.3% by mass percentage: 6.6% batching.
Step 2, will be by the load weighted epoxy resin of proportioning, synthesizing aminated curing agent of modification and butyl glycidyl ether class diluent are put into baking oven respectively and were heated 20 minutes down at 60 ℃, put into vacuum drying chamber then and under-0.001Mpa, vacuumized 60 minutes, remove moisture and bubble in the raw material;
Step 3, the synthesizing aminated curing agent of epoxy resin and modification is mixed, slowly add aluminium-hydroxide powder and butyl glycidyl ether class diluent up to fully while stir; After 60 minutes, put into 60 ℃ of heating of baking oven 20 minutes with the electric mixer stirring.Under-0.001Mpa, vacuumized 60 minutes once more, take out then and get rid of supernatant bubble;
Step 4, repeating step 3 once after 60 minutes, are put into 60 ℃ of heating of baking oven 20 minutes with the electric mixer stirring.Under-0.001Mpa, vacuumized 60 minutes once more, take out then and get rid of supernatant bubble;
Step 5, bubble-free raw material is molded in all kinds of vacuum insulator moulds, heats up and solidify: 120 ℃/2 hours.
Step 6, be cooled to room temperature, the demoulding is taken out, and carries out the test of surface resistivity and edge flashing magnitude of voltage.
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| CN100412996C (en) * | 2006-01-17 | 2008-08-20 | 中国南方电网有限责任公司电网技术研究中心 | +/-800kV ultra-high voltage DC synthesized insulator |
| CN100594561C (en) * | 2007-12-26 | 2010-03-17 | 中国科学院电工研究所 | Composite insulating material and method for producing the same |
| CN102153858A (en) * | 2011-05-12 | 2011-08-17 | 清华大学 | Composite insulating material and preparation method of composite insulating material |
| CN102153858B (en) * | 2011-05-12 | 2012-10-10 | 清华大学 | Composite insulating material and preparation method of composite insulating material |
| CN102708737A (en) * | 2012-04-20 | 2012-10-03 | 广西电网公司电力科学研究院 | Surface partial discharge model device of oil insulation transformer |
| CN102831991A (en) * | 2012-08-09 | 2012-12-19 | 河南平高电气股份有限公司 | Method for manufacturing epoxy-cast insulators |
| CN103337320A (en) * | 2013-06-13 | 2013-10-02 | 天津学子电力设备科技有限公司 | Surface charge quick dissipation method for silicone rubber composite insulator |
| CN103545058A (en) * | 2013-08-05 | 2014-01-29 | 华中科技大学 | Method for increasing vacuum surface flash-over voltage of insulating material |
| CN103545058B (en) * | 2013-08-05 | 2015-08-19 | 华中科技大学 | A kind of method improving insulating material vacuum edge flashing voltage |
| CN105086373A (en) * | 2015-09-22 | 2015-11-25 | 苏州普京真空技术有限公司 | Vacuum insulating material |
| CN105427969A (en) * | 2015-12-28 | 2016-03-23 | 南京电气高压套管有限公司 | Hollow paste-injected post insulator employing vacuum impregnated fiber |
| CN105427969B (en) * | 2015-12-28 | 2017-03-22 | 南京电气高压套管有限公司 | Hollow paste-injected post insulator employing vacuum impregnated fiber |
| CN108364731A (en) * | 2018-02-01 | 2018-08-03 | 清华大学 | Based on charge regulation and control and the novel basin-shaped insulator actively to dissipate |
| CN109575339A (en) * | 2018-11-30 | 2019-04-05 | 天津大学 | A kind of the nano coating insulator and preparation method of resistance to direct current flashover |
| CN109575339B (en) * | 2018-11-30 | 2021-10-15 | 天津大学 | Direct-current flashover resistant nano-coating insulator and preparation method thereof |
| CN109613411A (en) * | 2018-12-12 | 2019-04-12 | 国网山东省电力公司电力科学研究院 | A kind of preparation method of external insulation anti-pollution flashover coating electrical insulation properties test sample |
| CN109613411B (en) * | 2018-12-12 | 2021-03-19 | 国网山东省电力公司电力科学研究院 | Preparation method of test sample for electrical insulation performance of external insulation anti-pollution flashover coating |
| CN109659102A (en) * | 2018-12-29 | 2019-04-19 | 天津大学 | GIL the flashover voltage of the insulator improvement method based on gas-solid interface electric Field Optimization |
| CN110153847A (en) * | 2019-03-18 | 2019-08-23 | 华北电力大学 | For improving method, insulator and its grinding apparatus of insulator dielectric performance |
| CN110153847B (en) * | 2019-03-18 | 2021-06-01 | 华北电力大学 | Method for improving insulating property of insulator, insulator and polishing equipment thereof |
| CN110070968A (en) * | 2019-03-20 | 2019-07-30 | 天津大学 | A kind of sub- preparation method of nonlinear conductance coating insulation of resistance to direct current flashover |
| CN110070968B (en) * | 2019-03-20 | 2021-11-23 | 天津大学 | Preparation method of direct current flashover resistant nonlinear conductive coating insulator |
| CN111534198A (en) * | 2020-04-22 | 2020-08-14 | 上海闰龙电子材料有限公司 | Formula and preparation method of single-component insulation protection material for thermistor |
| CN115418151A (en) * | 2022-09-22 | 2022-12-02 | 江西爱瑞达电瓷电气有限公司 | Method for improving flashover voltage of ceramic insulator |
| CN115418151B (en) * | 2022-09-22 | 2023-11-10 | 江西爱瑞达电瓷电气有限公司 | Method for improving flashover voltage of ceramic insulator |
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