CN110283515A - A kind of epoxy matrix composite deep trap coating and application - Google Patents
A kind of epoxy matrix composite deep trap coating and application Download PDFInfo
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- CN110283515A CN110283515A CN201910558235.5A CN201910558235A CN110283515A CN 110283515 A CN110283515 A CN 110283515A CN 201910558235 A CN201910558235 A CN 201910558235A CN 110283515 A CN110283515 A CN 110283515A
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- coating
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- epoxy matrix
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- silicon carbide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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Abstract
The invention discloses a kind of epoxy matrix composite deep trap coating and application, the coating is the epoxy resin added with nanometer silicon carbide.The ratio of the nanometer silicon carbide addition is 1-7wt%.Preferably, the ratio of the nanometer silicon carbide addition is 5wt%.The preparation-obtained EP/SiC coating of the present invention changes macroscopically specimen surface charge distribution state by regulating and controlling the microcosmic distribution of traps of specimen surface, the injection of charge and the accumulation phenomena of surface charge can obviously be inhibited, improve the flashover voltage of epoxy matrix composite.What the coating was capable of large area is applied to molded apparatus insulated, can significantly improve its surface insulation performance, have higher economic value and practical function.
Description
Technical field
The invention belongs to the modified research fields in solid insulating material surface, are related to a kind of epoxy matrix composite deep trap
Coating and application.
Background technique
With the development of China's extra-high voltage direct-current transmission technology, the insulation safety problem of electrical equipment, which becomes, restricts transmission of electricity etc.
Grade improves, and influences the key of high voltage DC engineering construction.When insulator is chronically under high voltage direct current environment, polarity of voltage is not
Become, because the free charge that micro discharge, corona discharge generate accumulates in solid material surface, forms surface charge.On the one hand cause
Surface field distortion, induces shelf depreciation；On the other hand, kind of a charge of the electron also is provided for the development of creeping discharge, promotes flashover mistake
The formation of journey.Therefore surface charge is considered leads to the surface insulated one of the major reasons that can significantly reduce of solid insulating material.
Therefore, reliable apparatus insulated to guarantee, it is necessary to which that the Effective Regulation method for seeking surface charge inhibits the surface of insulating materials
Charge buildup phenomenon, to improve its insulation performance.
The accumulation phenomena of surface charge is a variety of by external environment, applied voltage waveform, electrode structure and material category etc.
The influence of factor, these factors result in its complexity and diversity for being distributed pattern.Current existing surface charge regulation side
Method be broadly divided into insulator physical chemical modification and optimize insulator two class of shape, the former include x ray irradiation x processing, fluorination treatment,
It is low-temperature plasma modified, using free radical scavenger inhibit charge buildup and by magnetron sputtering specimen surface coat apply
The method of modifying such as layer, these methods have certain experiment effect, but experimental cost is high, complicated for operation, single experiment area is small,
Limit its large-scale promotion；Though optimization insulator structure does not need to introduce other materials, it is easier to realize in engineering, it can not
Applied to insulator that is a large amount of molded or being on active service.In view of the above problems, the present invention is using natural sediment method to be modified
Specimen surface applying coating, coating layer thickness is controllable, flexible operation, simplicity, has good prospects for commercial application.Meanwhile it is existing
Studies have shown that the accumulation characteristic of surface charge and the distribution of traps of material surface are closely related.Above-mentioned material method of modifying is fallen
Pin point is that solid insulating material surface is made to form more shallow traps, improve surface conductivity, to accelerate surface charge
It dissipates；Or introduce deep trap and hinder further injecting into for charge, to achieve the effect that inhibit charge buildup.It applies on the surface of the material
When covering coating, needs to guarantee that coating and sample to be modified are in close contact first, guarantee to form fine and close coating；Next formulation for coating material
Selection has great influence to experimental result, and appropriate formulation for coating material can be changed with the distribution of traps of Effective Regulation material surface
The level density and energy level height for becoming surface trap, to inhibit the accumulation of surface charge.Therefore, it is necessary to study optimal coating
Formula, by natural sediment method, closely product is overlying on solid insulating material surface, inhibits the accumulation phenomena of surface charge.
Summary of the invention
In order to solve the problems in the existing technology, the present invention provide a kind of epoxy matrix composite deep trap coating and
Using, solve the problems, such as in the prior art surface charge regulation methods experiment it is at high cost, complicated for operation.
The technical solution of the present invention is as follows:
A kind of epoxy matrix composite deep trap coating, the coating are the epoxy resin added with nanometer silicon carbide.
The ratio of the nanometer silicon carbide addition is 1-7wt%.
Preferably, the ratio of the nanometer silicon carbide addition is 5wt%.
According to claim 1, epoxy matrix composite deep trap coating, the partial size of the nanometer silicon carbide are not surpass
Cross 100nm.
Epoxy matrix composite deep trap coating is in the application for inhibiting epoxy matrix composite surface charge accumulation.
Coating described in claim 1 is attached to epoxy matrix composite surface by natural sediment method.
The invention has the advantages that:
SiC is wide bandgap semiconductor (forbidden bandwidth > 2.5eV), has high breakdown field strength, high thermal conductivity (5W/ (cm
K)), the properties such as high rigidity and high-melting-point have obtained increasingly applying civilian with fields such as defence clcctronic, electricians.This hair
Bright preparation-obtained EP/SiC coating changes macroscopically specimen surface electricity by regulating and controlling the microcosmic distribution of traps of specimen surface
Lotus distribution can obviously inhibit the injection of charge and the accumulation phenomena of surface charge, improve the sudden strain of a muscle of epoxy matrix composite
Network voltage.What the coating was capable of large area is applied to molded apparatus insulated, can significantly improve its surface insulation performance, have
Standby higher economic value and practical function.
Detailed description of the invention
Fig. 1 is the EP/Al for being coated with EP/SiC coating2O3Composite material scanning electron microscope (SEM) photograph；
Fig. 2 is EP/SiC coating scanning electron microscope (SEM) photograph；Wherein (a) is addition 1wt%SiC；It (b) is 3wt%SiC；(c) it is
5wt%SiC；
Fig. 3 is direct draught surface charge distribution figure；Wherein (a) is addition 0wt%SiC；It (b) is 1wt%SiC；(c) it is
3wt%SiC；It (d) is 5wt%SiC；
Fig. 4 is negative pressure lower surface charge pattern；Wherein (a) is addition 0wt%SiC；It (b) is 1wt%SiC；(c) it is
3wt%SiC；It (d) is 5wt%SiC；
The trap level typical distribution characteristics of Fig. 5 direct draught EP/SiC coating；(a) shallow trap；(b) deep trap；
The trap level typical distribution characteristics of EP/SiC coating under Fig. 6 negative pressure；(a) shallow trap；(b) deep trap；
Fig. 7 SiC content, surface charge density maximum value and flashover voltage relational graph；(a) positive polarity；(b) negative polarity.
Specific embodiment
In the following with reference to the drawings and specific embodiments, technical solution of the present invention is described in further detail.
The present embodiment used coating is the EP/SiC coating that epoxy resin (EP) and nanometer silicon carbide (SiC) is mixed with,
Sample to be modified is EP/Al2O3Epoxy based nano composite material prepares sample, main preparation step using " mechanical blending method "
It is as follows:
EP/Al2O3Epoxy based nano composite material:
1) the nanometer Al of certain mass is weighed2O3Particle, by these nanometer of Al2O3Particle is placed in welding rod drying box,
Drying box temperature setting is 100 DEG C, and the time is set as 24 hours to remove moisture removal as far as possible；
2) a certain amount of EP is weighed, and by the nanometer Al after drying2O3Particle is added in EP according to the mass ratio of setting,
It is sufficiently stirred to obtain just miscible fluid；
3) obtained first miscible fluid is placed in digital display temperature constant magnetic stirring water-bath, in 50 DEG C of at a temperature of magnetic agitation
1h；
4) mixed solution after stirring is moved in ultrasonic cleaner, setting ultrasonic temperature is 50 DEG C, utilizes ultrasonic wave
Decentralized processing 1h is carried out, to guarantee that nano particle is uniformly dispersed in the epoxy；
5) it is that 100:30 weighs curing agent according to mass ratio according to epoxy resin and curing agent, curing agent is added to nanometer
Al2O3In the mixed solution of particle and EP；
6) mixed solution that joined curing agent is placed in thermostat water bath, water bath temperature is still set as being 50
DEG C, and 10min is stirred at this temperature, stirred rear solution surface has many tiny bubbles；
7) in order to exclude the bubble in previous step, it is 30 DEG C by vacuum oven temperature setting, above-mentioned solution is carried out
Vacuum pre-treatment 10min, is then divided and pours into mold；
8) mold is put into vacuum oven, under vacuum conditions degassing process 1h, at this time the temperature of vacuum oven
It is maintained at 30 DEG C；
9) after above-mentioned processing, mold is placed into hot elongation test instrument and is solidified, transferred in 70 DEG C of temperature
3h is set, curing process after 3h is done then is placed at a temperature of 120 DEG C；
10) temperature in hot elongation test instrument is adjusted, room temperature is dropped to gradually with the rate of 1 DEG C/min, is finally obtained real
Test the molding EP/Al of needs2O3Nanocomposite.
EP/SiC coating
1) SiC chooses the β-SiC, partial size 50nm produced by Xuzhou Hong Wu nano material Co., Ltd.SiC is existed before experiment
It is dried under 100 DEG C of environment for 24 hours, to go the influence of moisture removal, is added in EP after drying, addition ratio is set respectively
It is set to 1wt%, 3wt% and 5wt%.
2) " mechanical blending " preparation process of SiC and EP prepares EP/Al2O3Shi Xiangtong, then uniformly mixed EP/SiC is made
After coating, coating is closely attached to by EP/Al by natural sediment method2O3Composite material surface, in view of coating and composite material
Polymer material is epoxy resin, it is ensured that the compactness of attaching is laid a solid foundation for the smooth development of follow-up study.
3) after the completion of EP/SiC coating preparation, coating is attached to by EP/Al by natural sediment method2O3Composite material surface.
Interpretation of result:
1) EP/SiC coating dense uniform and SiC particulate is well dispersed in EP
It is observed using scanning electron microscope (SEM), device model is HITACHI S-4800 Flied emission scanning electricity
Sub- microscope, thermoelectricity electron accelerating voltage are 5kV, and highest resolution is up to 1.0nm, as a result as depicted in figs. 1 and 2.It can be with from Fig. 1
Find out, coating is uniformly coated on EP/Al2O3 composite material surface, forms dense coating.Figure it is seen that SiC particulate
The favorable dispersibility in EP/SiC coating, no obvious agglomeration occur.
2) obvious to the inhibitory effect of charge buildup
± 10kV voltage is applied outside measuring, whether there is or not the surface charge distribution pattern of coating sample, surface electricity after the 30min that pressurizes
Lotus measurement result is as shown in Figure 3 and Figure 4.From figure it is found that EP/SiC coating can significantly inhibit the accumulation phenomena of surface charge, and
When SiC content is 5wt% in coating, inhibitory effect is most obvious.
3) the trap level distribution characteristics of coating surface
The distribution of traps of coating surface is measured using isothermal surface potential decay method (ISPD), as a result such as Fig. 5-6.From figure
In as can be seen that with SiC content in coating increase, the deep trap quantity in electron trap or hole trap increases, energy
Grade improves；Shallow trapping state improves.
The trap level highest of specimen surface when SiC content is 5wt% in coating, charge inject more difficult, surface
Charge buildup is minimum.
The raising of trap level and the increase of deep trap quantity cause high-field electrode nearby to be entered to fall into electricity by what trap captured
Lotus quantity increases, and enters the reversed electric field that sunken charge generates and electrode is prevented to continue to inject charge to specimen surface, significantly reduce
The source of surface charge, to inhibit the accumulation of surface charge.
4) influence of the coating to sample flashover voltage
After charge buildup experiment, the flashover voltage whether there is or not coating sample is measured, as a result as shown in Figure 7.By scheming
It is found that when have coating and in coating SiC content gradually increase, surface charge density gradually decreases, positive-negative polarity flashover electricity
Pressure is gradually increased, and the surface insulation performance of sample significantly improves.
The invention is not limited to the technology described in embodiment, its description is illustrative, and unrestricted.
Permission of the invention is defined in the claims, and the side such as can change, recombinate according to the present invention based on those skilled in the art
The technology related to the present invention that method obtains, all within protection scope of the present invention.
Claims (6)
1. a kind of epoxy matrix composite deep trap coating, which is characterized in that the coating is the ring added with nanometer silicon carbide
Oxygen resin.
2. epoxy matrix composite deep trap coating according to claim 1, which is characterized in that the nanometer silicon carbide addition
Ratio be 1-7wt%.
3. epoxy matrix composite deep trap coating according to claim 2, which is characterized in that the nanometer silicon carbide addition
Ratio be 5wt%.
4. epoxy matrix composite deep trap coating according to claim 1, which is characterized in that the grain of the nanometer silicon carbide
Diameter is no more than 100nm.
5. epoxy matrix composite deep trap coating is in the application for inhibiting epoxy matrix composite surface charge accumulation.
6. applying according to claim 5, which is characterized in that attached coating described in claim 1 by natural sediment method
On epoxy matrix composite surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910558235.5A CN110283515A (en) | 2019-06-26 | 2019-06-26 | A kind of epoxy matrix composite deep trap coating and application |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910558235.5A CN110283515A (en) | 2019-06-26 | 2019-06-26 | A kind of epoxy matrix composite deep trap coating and application |
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| Publication Number | Publication Date |
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| CN110283515A true CN110283515A (en) | 2019-09-27 |
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| CN201910558235.5A Pending CN110283515A (en) | 2019-06-26 | 2019-06-26 | A kind of epoxy matrix composite deep trap coating and application |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724434A (en) * | 2019-10-15 | 2020-01-24 | 华北电力大学 | Nano SiC/epoxy coating material, preparation method and application thereof |
| CN113345659A (en) * | 2021-03-25 | 2021-09-03 | 天津大学 | Basin-type insulator surface charge prevention and control method based on flexible coating |
-
2019
- 2019-06-26 CN CN201910558235.5A patent/CN110283515A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| M.H.WANG等: "Effect of Coating on Surface Charge Accumulation and DC Flashover of Epoxy/Al2O3 Nanocomposites", 《2018 IEEE 2ND INTERNATIONAL CONFERENCE ON DIELECTRICS (ICD)》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724434A (en) * | 2019-10-15 | 2020-01-24 | 华北电力大学 | Nano SiC/epoxy coating material, preparation method and application thereof |
| CN113345659A (en) * | 2021-03-25 | 2021-09-03 | 天津大学 | Basin-type insulator surface charge prevention and control method based on flexible coating |
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