CN106700196A - Nanocomposite material for inhibiting space charge by regulating and controlling micro scale structure through electric field - Google Patents
Nanocomposite material for inhibiting space charge by regulating and controlling micro scale structure through electric field Download PDFInfo
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- CN106700196A CN106700196A CN201610991267.0A CN201610991267A CN106700196A CN 106700196 A CN106700196 A CN 106700196A CN 201610991267 A CN201610991267 A CN 201610991267A CN 106700196 A CN106700196 A CN 106700196A
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- composite material
- electric field
- space charge
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention discloses a preparation method of a nanocomposite material for inhibiting a space charge by regulating and controlling a micro scale structure through an electric field and relates to preparation and modification of a nano/polymer composite material. The invention aims at solving the problems that the migration of a trapped charge is retarded and the attenuation rate is low after short circuit due to randomness of arrangement of lamellar montmorillonite (MMT) in low density polyethylene (LDPE) in an MMT/LDPE composite material. The method comprises the following steps: firstly, drying the MMT/LDPE composite material, then putting the dried MMT/LDPE composite material in a plate vulcanizing machine and carrying out compression molding to obtain a lamellar sample; secondly, setting up an electrical field regulation and control experimental platform; thirdly, carrying out temperature rise on the sample, and regulating and controlling the sample in a molten state by applying pressure intensity; fourthly, stopping heating after electrical field regulation and control is carried out for a period of time, and removing field intensity after the sample is cooled to a certain temperature; fifthly, continuously cooling the sample, crystallizing, then taking out the sample and finishing the preparation of the sample. The preparation method disclosed by the invention is used for preparing the nanocomposite material for inhibiting the space charge.
Description
Technical field
The invention belongs to advanced composite material (ACM) preparation field, and in particular to nanometer/polymer composites Space-charge
Suppression.
Background technology
Polymeric material is increasingly becoming and is insulated after oil-paper etc. with its excellent insulating properties, mechanicalness and chemical stability
Another generation novel cable material after material, leading position is occupied in ac high-voltage power transmission application.However, compared to oil-filled electricity
Cable, oil immersion paper cable and gas-filled cable etc., although extruded type polymer cable possesses the small, low cost of loss, construction and maintenance side
Just the advantages of, but application in direct current high tension transmission is far away from the latter, because under high direct voltage long term, poly- second
Substantial amounts of space charge is easily accumulated in the polymeric materials such as alkene.The presence and migration of space charge will result directly in media interior
Field intensity is distorted, so that trigger shelf depreciation, electric branch or even puncture, therefore space charge turns into restriction HVDC plastics
The major obstacle of cable development.Domestic and foreign scholars have done a large amount of effort in terms of space charge accumulation is suppressed, wherein more effective
Method be exactly to adding nano material in polymer.Addition nano material can introduce deep trap, and deep trap capture electric charge is simultaneously
Its movement is limited, the local accumulation of space charge can be effectively reduced, so as to improve the insulating properties of material, especially sheet is received
Rice material, such as montmorillonite（MMT）, migration of its lamellar structure to carrier play a part of hindered diffusion, but traditional sample
Lamella MMT arrangements are unordered in material obtained in preparation method, and the inhibition to carrier mobility is unsatisfactory, therefore after short circuit
Still there is more electric charge remaining in sample.But if by certain technology lamella MMT can be enabled along a direction parallel
Row, then carrier will substantially be blocked in the migration on MMT lamellas direction, pressure-resistant performance meeting in this direction
Significantly improve；And along parallel to the iris action that lamellar structure is lost in MMT orientations, carrier can be with " unimpeded nothing
Resistance ", accelerates the migration of carrier, so as to reduce the residual quantity of space charge after short circuit.
The content of the invention
Regarding to the issue above, it is contemplated that dispersities of the regulation and control lamella MMT in LDPE, makes MMT along a direction
The migration rate of electric charge is gone up in orientations, raising in the direction, so as to make because the capture of trap is limited in reducing composite
With causing the problem that charge decay is slow, charge residue amount is big, there is provided a kind of nano combined material that can effectively suppress space charge
The preparation method of material.
To achieve these goals, the preparation method of nano composite material of space charge is suppressed in the present invention by following steps
It is rapid to complete：
Step one, will MMT/LDPE composites dry after be placed in it is compressing in vulcanizing press, be obtained sheet specimens；
Step 2, copper coin ground electrode and high pressure copper electrode are placed in baking oven, ground electrode is connected with earth terminal, the external change of high-pressure stage
Depressor high-pressure side, transformer connects regulator；
Step 3, sample is placed between two electrodes, and guarantee is fully contacted with two electrodes, and oven temperature is increased into a constant temperature
Spending simultaneously continuous action for a period of time, makes sample melt completely；
Step 4, step 3 set at a temperature of staged boost to a certain value after remain unchanged, precompressed stops afterwards for a period of time
Only baking oven heating, keeps field intensity constant, when temperature is down to a certain value, removes voltage, and high-pressure stage is put with ground electrode short circuit
Electricity；
Step 5, when oven temperature continues cool to a certain temperature, take out sample, now gained sample be through electric field regulate and control
Nano composite material afterwards.
In step one of the invention, after the completion of prepared by sheet specimens, sample should not be separated with mould, to ensure in step
In four, sample is indeformable when regulating and controlling melting sample by electric field.
High-field electrode used should suppress corona through epoxy casting in step 2.
Oven temperature is set as 160 DEG C in step 3, and action time 20min, it is ensured that sample is melted completely makes lamella MMT
Overturn along electric field in the LDPE environment of melting.
Precompressed voltage is alternating current in step 4, and field intensity is set as 20kV/mm, and baking oven is stopped after continuous action 20min
Heating, removes pressure when temperature is cooled to 80 DEG C.
Sample is taken out when oven temperature continues cool to 40 DEG C, sample is successfully prepared.
Brief description of the drawings：
For ease of explanation, the present invention is described in detail by following specific implementations and accompanying drawing.
Fig. 1 is that electric field regulates and controls experimental provision.
In figure：1-pressure regulation and overcurrent protector；2-transformer；3-epoxy bushing；4-baking oven；5-epoxy resin；
6-high pressure copper electrode；7-copper coin ground electrode；8-mylar and sample；9-temperature controller.
Fig. 2 is temperature control and pressurization sequence figure in electric field regulation process.
Fig. 3 is the SEM scan images before and after the regulation and control of composite electric field, wherein scheming（a）It is the nanometer without electric field regulation and control
Composite SEM image, figure（b）It is the nano composite material SEM image after regulating and controlling through electric field.
Fig. 4 is the attenuation of space charge during short circuit before and after composite electric field regulates and controls, wherein scheming（a）It is composite wood
The attenuation of short-circuit process Space-charge when material regulates and controls without electric field, figure（b）Short circuit after regulating and controlling through electric field for composite
The attenuation of process Space-charge.In figure：Abscissa represents short circuit duration, and ordinate represents sample thickness, the face of colour code
Color represents the polarity and density of space charge with the depth.
Specific embodiment：
This experimental embodiment first with low density polyethylene (LDPE) and lamella montmorillonite as raw material prepare it is traditional nano combined
Material, specific method is as follows：Low density polyethylene (LDPE) and nano imvite are respectively placed in sizeable vessel, are placed in drying
Dried in case, oven temperature is set as 60 DEG C, and drying time is 24h；Using torque rheometer by polyethylene and nano imvite
Kneaded, torque rheometer temperature is first set as 160 DEG C, torque flow is added to after 40g polyethylene is weighed after temperature stabilization
Become in instrument, being weighed again during 0.4g montmorillonites are added to torque rheometer after polyethylene is melted completely carries out melt blending, time
20min, obtains traditional MMT/LDPE nano composite materials.
The preparation method that electric field regulation and control suppress the nano composite material of space charge is completed by following step：
Step one, composite is put dry in an oven, oven temperature is set as 60 DEG C, and drying time is 24h；
Step 2, the circular die for taking on the polyester film that thickness is 180 μm a diameter of 4cm, weigh 0.23g composites and put
In circular die, sample respectively puts a polyester film layer up and down with mould, is then placed within compressing, flat board in compression molding agent
Vulcanizer temperature is set as 160 DEG C, and pressure 15MPa, press time 20min are obtained sheet specimens, should not the demoulding；
Step 3, sheet specimens are placed between baking oven mesohigh copper electrode and copper coin ground electrode, and oven temperature is set as
160 DEG C, continue 20min, sample is melted completely；
Step 4, in order to prevent sample from puncturing, using staged boost, i.e., first impose 5kV/mm field intensity continue 5min, then will
Field intensity is increased to 10kV/mm and continues 5min, successively recursion, until field intensity reaches 20kV/mm, after acting on 20min under the field intensity
Stop baking oven heating, cooled down in natural environment, voltage is removed when sample is cooled to 80 DEG C, and high-pressure stage is short with ground electrode
Connect electric discharge；
Step 5, sample is taken out when oven temperature is cooled to 40 DEG C, prepare and complete.
Claims (5)
1. a kind of electric field regulates and controls the nano composite material of the suppression space charge of micro scale structure, it is characterised in that the system of composite
Preparation Method follow these steps to realize：
Step one, will MMT/LDPE composites dry after be placed in it is compressing in vulcanizing press, be obtained sheet specimens, now
Should not the demoulding, i.e. mould do not separated with sample；
Step 2, copper coin ground electrode and high pressure copper electrode are placed in baking oven, ground electrode is connected with earth terminal, the external change of high-pressure stage
Depressor high-pressure side, transformer connects regulator；
Step 3, sample is placed between two electrodes, and guarantee is fully contacted with two electrodes, and oven temperature is increased into a constant temperature
Spending simultaneously continuous action for a period of time, makes sample melt completely；
Step 4, the staged boosting at a temperature of step 3, precompressed stop baking oven heating afterwards for a period of time, keep field intensity not
Become, when temperature is down to a certain value, remove voltage, and high-pressure stage and ground electrode short circuit are discharged；
Step 5, when oven temperature continues cool to a certain temperature, take out sample, now gained sample be through electric field regulate and control
Nano composite material afterwards.
2. electric field according to claim 1 regulates and controls the preparation side of the nano composite material of the suppression space charge of micro scale structure
Method, it is characterised in that enable lamella MMT arranged in parallel along direction of an electric field, for electric charge conveying provides passage.
3. it is according to claim 1 and 2 suppress space charge nano composite material preparation method, it is characterised in that step
The melt temperature of sample is 160 DEG C, duration 20min in rapid three.
4. electric field according to claim 1 and 2 regulates and controls the system of the nano composite material of the suppression space charge of micro scale structure
Preparation Method, it is characterised in that squeeze time is 20min in step 4, it is 80 DEG C to remove pressure temperature.
5. electric field according to claim 1 regulates and controls the preparation side of the nano composite material of the suppression space charge of micro scale structure
Method, it is characterised in that take out sample when oven temperature is cooled to 40 DEG C in step 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610991267.0A CN106700196A (en) | 2016-11-11 | 2016-11-11 | Nanocomposite material for inhibiting space charge by regulating and controlling micro scale structure through electric field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610991267.0A CN106700196A (en) | 2016-11-11 | 2016-11-11 | Nanocomposite material for inhibiting space charge by regulating and controlling micro scale structure through electric field |
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| CN106700196A true CN106700196A (en) | 2017-05-24 |
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| CN201610991267.0A Pending CN106700196A (en) | 2016-11-11 | 2016-11-11 | Nanocomposite material for inhibiting space charge by regulating and controlling micro scale structure through electric field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112799120A (en) * | 2019-11-13 | 2021-05-14 | 中国科学院国家空间科学中心 | Double-channel electrostatic analyzer for ion and electron synchronous measurement |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102831992A (en) * | 2012-08-13 | 2012-12-19 | 重庆大学 | Device and method for inducing orientation arrangement of montmorillonoid in polyethylene by using electric field |
-
2016
- 2016-11-11 CN CN201610991267.0A patent/CN106700196A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102831992A (en) * | 2012-08-13 | 2012-12-19 | 重庆大学 | Device and method for inducing orientation arrangement of montmorillonoid in polyethylene by using electric field |
Non-Patent Citations (2)
| Title |
|---|
| LIJUN YANG ET. AL: "Electric Field Inducement of Montmorillonite in LDPE and Properties of Electrical Tree Growing in this Composite", 《IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION》 * |
| 杨丽君等: "电场诱导蒙脱土在聚乙烯中取向分散及对其电树枝特性影响研究", 《中国电机工程学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112799120A (en) * | 2019-11-13 | 2021-05-14 | 中国科学院国家空间科学中心 | Double-channel electrostatic analyzer for ion and electron synchronous measurement |
| CN112799120B (en) * | 2019-11-13 | 2024-03-22 | 中国科学院国家空间科学中心 | Dual-channel electrostatic analyzer for synchronous measurement of ions and electrons |
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Application publication date: 20170524 |