CN110408131A - A kind of high-insulation hv cable termination - Google Patents
A kind of high-insulation hv cable termination Download PDFInfo
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- CN110408131A CN110408131A CN201910424271.2A CN201910424271A CN110408131A CN 110408131 A CN110408131 A CN 110408131A CN 201910424271 A CN201910424271 A CN 201910424271A CN 110408131 A CN110408131 A CN 110408131A
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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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
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/06—Cable terminating boxes, frames or other structures
- H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
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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
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
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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
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- C08K2201/011—Nanostructured additives
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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- Organic Insulating Materials (AREA)
Abstract
The present invention proposes a kind of high-insulation hv cable termination, including stress cone and insulating body；The material composition for preparing stress cone includes: 70-120 parts of liquid silastic, 30-50 parts of modifying agent, 3-6 parts of maleamic acid, 2-4 parts of vulcanizing agent in parts by weight；The material composition for preparing insulating body includes: 30-50 parts of EPDM, 0.8-1.2 parts of maleic anhydride, 15-25 parts of ethylene-butene copolymer, 20-40 parts of haloflex, 8-15 parts of hydrogenated nitrile-butadiene rubber, 10-25 parts of nanosized SiO_2,2-5 parts of nano carbon black, 0.45-0.75 parts of initiator, 8-15 parts of plasticizer, 2-4 parts of silane coupling agent, 100-200 parts of filler, 4-8 parts of lubricating auxiliary agent, 6-10 parts of coagent, 2-3.5 parts of age resister, 4-10 parts of vulcanizing agent in parts by weight；Acidifying graphite is added in liquid silastic, by carrying out activating pretreatment to graphite, improves the specific surface area and surface hydroxyl quantity of graphite, improves dispersibility of the graphite in liquid silastic, inhibit the generation of space charge, improve the electric property of insulation system.
Description
Technical field
The present invention relates to a kind of high-insulation hv cable terminations.
Background technique
Cable termination is the important link of cable run, is mounted in cable end piece, to guarantee cable run and electric power
The gas of system other parts connects, and keeps insulating to the device of tie point；Domestic and international flexible DC transmission route one at present
As use the insulating sheath of crosslinked polyethylene (XLPE) as cable termination, with excellent chemical stability and solvent resistance,
However, can gathered inside insulating layer greatly due to fault in material etc. when crosslinked polyethylene is under high voltage direct current environment
The charge of amount, and then the insulating layer internal field that distorts, lead to the damage of insulating layer；And due to intrinsic in being chemically crosslinked in XLPE
The characteristics of cause XLPE cable terminal to there are problems that water-treeing in the process of running so that in the long term of power plant
Under, it is possible to cause insulation breakdown problem, directly threatens the normal operation of route；Stress cone generally uses silicon rubber at present,
But silicon rubber is as often intensity is inadequate in stress cone application process, and stress cone is the pass as homogenizing cable accessory electric field
Key member, under non-uniform electric field, stress cone end, which is easy to appear the problems in field strength collection, leads to the aging journey of stress wimble structure
Degree is accelerated, or even phenomena such as corona and shelf depreciation occurs, seriously affects the operation steady in a long-term of equipment；
In recent years, ethylene propylene diene rubber (EPDM) is gradually applied in cable termination field, and EPDM has lower
Density and excellent ageing-resistant performance, glue ozone resistance, heat resistance, low-temperature pliability are preferable, can be used for resistance to ozone, it is weather-proof,
UV resistant occasion, but based on the design feature of itself, tearing strength, anti-flammability, oil resistivity and caking property are poor, simple
EPDM insulated cable performance is extremely difficult to related specification requirement；And the generation of DC electric field Space-charge is also cable termination
One key factor of insulating materials aging.
Summary of the invention
In view of the above-mentioned problems, the invention proposes a kind of high-insulation hv cable termination, including stress cone and insulation master
Body；The material composition for preparing insulating body includes: 30-50 parts of EPDM, 0.8-1.2 parts of maleic anhydride, ethylene-in parts by weight
15-25 parts of butylene copolymer, 20-40 parts of haloflex, 8-15 parts of hydrogenated nitrile-butadiene rubber, 10-25 parts of nanosized SiO_2, Nano carbon
2-5 parts black, 0.45-0.75 parts of initiator, 8-15 parts of plasticizer, 2-4 parts of silane coupling agent, 100-200 parts of filler, lubrication help
4-8 parts of agent, 6-10 parts of coagent, 2-3.5 parts of age resister, 4-10 parts of vulcanizing agent；
Prepare stress cone material composition include: in parts by weight 70-120 parts of liquid silastic, 30-50 parts of modifying agent,
3-6 parts of maleamic acid, 2-4 parts of vulcanizing agent；
The modifying agent the preparation method is as follows:
(1) 15-25 parts of graphite powders are immersed in the nitric acid solution that mass fraction is 10-30% and is acidified, flowed back at 65-85 DEG C
4-6h removes extra nitric acid solution, and after gained acidifying graphite is cleaned 2-3 times with deionized water, vacuum drying is acidified
Graphite；
(2) 50-100 parts of ethyl alcohol and 25-50 parts are dispersed by 8-15 parts of 3- aminopropyl triethoxysilanes in a kettle
In the mixed solution of water, then by acidifying graphite obtained in 10-20 parts of white carbon blacks and step (1) be added reaction kettle, 70-90 DEG C
Lower reaction 10-13h uses ethanol washing after reaction, is centrifugally separating to obtain the modifying agent.
Preferably, the Nano-meter SiO_22Diameter is 10nm, specific surface area 150m2/g。
Preferably, the nano carbon black is conductive carbon black, diameter 100nm, specific surface area 30m2/g。
Preferably, the initiator is 2,5- dimethyl -2,5- bis(t-butylperoxy) hexane.
Preferably, the plasticizer is dioctyl phthalate；The silane coupling agent is three second of butadienyl
Oxysilane；The filler is calcinated argil；The lubricating auxiliary agent is stearic acid；The coagent is that trimerization is different
Three enester of cyanic acid；The age resister is bis- [(β-(3,5- di-tert-butyl-4-hydroxyl benzyl)-methyl carboxy ethyl)] sulphur
Ether.
Preferably, the vulcanizing agent is cumyl peroxide, ethyl thiourea, ethylene thiourea or thiadiazoles derivative
One or more of.
Beneficial effects of the present invention:
(1) acidifying graphite is added in liquid silastic, it is poor to improve compatibility between conventional graphite and silicon rubber
Problem carries out activating pretreatment to graphite by the nitric acid of suitable concentration, improves the specific surface area and surface hydroxyl number of graphite
Amount, increases reactivity, is allowed to preferably match with silane coupling agent 3- aminopropyl triethoxysilane, improves graphite and exists
Dispersibility in liquid silastic regulates and controls the field distribution near stress cone, inhibits the generation of space charge, improves insulation system
Electric property；
(2) reinforcement is carried out to liquid silastic using modified white carbon black, is easily easily sent out in silicon rubber with improving white carbon black
Raw the phenomenon that reuniting；Wherein, white carbon black is modified using silane coupling agent and maleamic acid, silane coupling agent can be
Silica particles surface forms one layer of adsorption layer, increases the repulsive force of electric double layer to improve the dispersion effect of white carbon black；Malaysia acyl
Amino acid is connected to the surface of white carbon black by hydrogen bond, promotes the dispersion of white carbon black, and the carbon-carbon double bond in maleamic acid can
To participate in the cross-linking reaction of silicon rubber, to further enhance the active force between white carbon black and silicon rubber, reach further benefit
Strong effect improves the mechanical performance of stress wimble structure；
(3) traditional XLPE insulating materials is substituted using EPDM mixed rubber, EPDM rubber has low-density, good resistance to
The advantages that Hou Xing, ageing-resistant performance, high thermal insulation and ablation resistance outstanding, is aided with ethylene-butene copolymer, chlorination gathers
Ethylene not only improves and further improves the mechanical strength and flame retardant property of EPDM insulator, and increases EPDM skeleton
With the adhesive property between interior external shielding layer, reduce the air gap between insulating layer and interior external shielding layer, reduces cable insulation and hit
The risk worn effectively reduces the material cost of insulating layer on the basis of improving insulation rubber performance；Hydrogenated butyronitrile rubber
Glue can significantly improve the mechanical performance of EPDM, but hydrogenated nitrile-butadiene rubber and EPDM are thermodynamics Immiscible Polymer Blends, this hair
It is bright to have carried out fusion-grafting on EPDM using maleic anhydride compatilizer EPDM-g-MAH, MAH and hydrogenated nitrile-butadiene rubber has been made
Between compatibility it is preferable, can make to obtain between EPDM and hydrogenated nitrile-butadiene rubber it is compatible well mix, improve insulating materials
Mechanical property；Add Nano-meter SiO_22And nano carbon black, it can not only improve the mechanical performance of EPDM, improve the tensile strength of material
And elongation at break；The addition of nano carbon black can effectively inhibit the accumulation of insulating materials Space-charge, reduce inside sample
Space charge total amount improves cable terminal insulation material ageing-resistant performance.
Specific embodiment
It is clear to be more clear technical solution of the present invention, the present invention is further retouched below with reference to embodiment
It states, the technical characteristic of any pair of technical solution of the present invention carries out the scheme that equivalencing is obtained with conventional reasoning and each falls within the present invention
Protection scope.
The invention proposes a kind of high-insulation hv cable termination, including cable termination main body, the terminal body
One end forms stress cone, and the cable termination main body includes being arranged in the intracorporal conductor of cable termination master and being coated on conductor
Outer insulating layer, the terminal body and the stress cone are integrated pre-formed；
Embodiment 1
The material composition for preparing insulating body includes: 45 parts of EPDM, 1.1 parts of maleic anhydride, ethylene-fourth in parts by weight
22 parts of alkene copolymer, 26 parts of haloflex, 11 parts of hydrogenated nitrile-butadiene rubber, Nano-meter SiO_2219 parts, 4 parts of nano carbon black, 2,5- bis-
0.6 part of methyl -2,5- bis(t-butylperoxy) hexane, 12 parts of dioctyl phthalate, butadienyl triethoxysilane 3
Part, 140 parts of calcinated argil, 7 parts of stearic acid, 8 parts of three enester of cyamelide, bis- [(β-(3,5- di-t-butyl -4- hydroxyl benzyls
Base)-methyl carboxy ethyl)] 3 parts of thioether, 9 parts of ethyl thiourea；
The material composition for preparing stress cone includes: 86 parts of liquid silastic, 35 parts of modifying agent, maleic amide in parts by weight
4 parts, 3 parts of cumyl peroxide of acid；
The modifying agent the preparation method is as follows:
(1) 22 parts of graphite powders are immersed in the nitric acid solution that mass fraction is 30% and is acidified, flow back 6h at 70 DEG C, removes more
Remaining nitric acid solution, after gained acidifying graphite is cleaned 3 times with deionized water, vacuum drying obtains acidifying graphite；
(2) mixing for dispersing 70 parts of ethyl alcohol and 30 parts of water for 9 parts of 3- aminopropyl triethoxysilanes in a kettle is molten
In liquid, reaction kettle then is added in acidifying graphite obtained in 12 parts of white carbon blacks and step (1), 10h, reaction knot are reacted at 80 DEG C
Ethanol washing is used after beam, is centrifugally separating to obtain the modifying agent.
Embodiment 2
The material composition for preparing insulating body includes: 35 parts of EPDM, 0.8 part of maleic anhydride, ethylene-fourth in parts by weight
20 parts of alkene copolymer, 40 parts of haloflex, 12 parts of hydrogenated nitrile-butadiene rubber, Nano-meter SiO_2225 parts, 4 parts of nano carbon black, 2,5- bis-
0.75 part of methyl -2,5- bis(t-butylperoxy) hexane, 11 parts of dioctyl phthalate, butadienyl triethoxysilane
4 parts, 120 parts of calcinated argil, 5 parts of stearic acid, 9 parts of three enester of cyamelide, bis- [(β-(3,5- di-t-butyl -4- hydroxyl benzyls
Base)-methyl carboxy ethyl)] 2.5 parts of thioether, 7 parts of ethylene thiourea；
The material composition for preparing stress cone includes: 100 parts of liquid silastic, 40 parts of modifying agent, Malaysia acyl in parts by weight
6 parts of amino acid, 4 parts of cumyl peroxide；
The modifying agent the preparation method is as follows:
(1) 25 parts of graphite powders are immersed in the nitric acid solution that mass fraction is 30% and is acidified, flow back 4h at 80 DEG C, removes more
Remaining nitric acid solution, after gained acidifying graphite is cleaned 3 times with deionized water, vacuum drying obtains acidifying graphite；
(2) in a kettle 15 parts of 3- aminopropyl triethoxysilanes are dispersed in the mixing of 100 parts of ethyl alcohol and 50 parts of water
In solution, reaction kettle then is added in acidifying graphite obtained in 13 parts of white carbon blacks and step (1), reacts 10h at 90 DEG C, is reacted
After use ethanol washing, be centrifugally separating to obtain the modifying agent.
Embodiment 3
The material composition for preparing stress cone includes: 120 parts of liquid silastic, 40 parts of modifying agent, Malaysia acyl in parts by weight
5 parts of amino acid, 4 parts of ethyl thiourea；
The material composition for preparing insulating layer includes: 50 parts of EPDM, 1.2 parts of maleic anhydride, Ethylene/Butylene in parts by weight
5 parts of copolymer 1,33 parts of haloflex, 11 parts of hydrogenated nitrile-butadiene rubber, Nano-meter SiO_2222 parts, 4 parts of nano carbon black, 2,5- diformazan
0.6 part of base -2,5- bis(t-butylperoxy) hexane, 9 parts of dioctyl phthalate, 2 parts of butadienyl triethoxysilane,
170 parts of calcinated argil, 7 parts of stearic acid, 8 parts of three enester of cyamelide, bis- [(β-(3,5- di-tert-butyl-4-hydroxyl benzyl)-
Methyl carboxy ethyl)] 2 parts of thioether, 8 parts of ethylene thiourea；
The modifying agent the preparation method is as follows:
(1) 20 parts of graphite powders are immersed in the nitric acid solution that mass fraction is 30% and is acidified, flow back 5h at 80 DEG C, removes more
Remaining nitric acid solution, after gained acidifying graphite is cleaned 3 times with deionized water, vacuum drying obtains acidifying graphite；
(2) mixing for dispersing 90 parts of ethyl alcohol and 45 parts of water for 10 parts of 3- aminopropyl triethoxysilanes in a kettle is molten
In liquid, reaction kettle then is added in acidifying graphite obtained in 20 parts of white carbon blacks and step (1), 13h, reaction knot are reacted at 85 DEG C
Ethanol washing is used after beam, is centrifugally separating to obtain the modifying agent.
Performance test
The cable termination prepared in embodiment 1-3 is tested for the property respectively, test result is shown in table 1；According to GB/T
1040.1-2006 Standards for Testing Materials tensile strength and elongation at break；According to the body of GB/T1410-2006 test material
Product resistivity；
Low temperature brittleness condition: -40 DEG C × 4 hours；Heat ageing condition: 135 ± 2 DEG C × 168 hours.
The stress cone of comparative example is using liquid silastic as material, and insulating layer is using EPDM as material, the same embodiment of preparation method
1-3；
Table 1
By test result it is found that cable termination of the invention is for comparative example, have preferable mechanical performance and
Insulation performance, there is no the mechanical performances for reducing cable termination material for the addition of modified graphite, and have its tool disruptive field intensity
It is promoted, is more suitable for the insulating materials requirement of cable termination.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the scope of protection of the present invention.Therefore, protection scope of the present invention should be with the protection scope of claims
Subject to.
Claims (6)
1. a kind of high-insulation hv cable termination, including stress cone and insulating body；It is characterised in that it includes insulating body and
Stress cone；
The material composition for preparing insulating body includes: 30-50 parts of EPDM, 0.8-1.2 parts of maleic anhydride, ethylene-in parts by weight
15-25 parts of butylene copolymer, 20-40 parts of haloflex, 8-15 parts of hydrogenated nitrile-butadiene rubber, Nano-meter SiO_2210-25 parts, Nano carbon
2-5 parts black, 0.45-0.75 parts of initiator, 8-15 parts of plasticizer, 2-4 parts of silane coupling agent, 100-200 parts of filler, lubrication help
4-8 parts of agent, 6-10 parts of coagent, 2-3.5 parts of age resister, 4-10 parts of vulcanizing agent；
The material composition for preparing stress cone includes: 70-120 parts of liquid silastic, 30-50 parts of modifying agent, Malaysia in parts by weight
3-6 parts of amic acid, 2-4 parts of vulcanizing agent；
The modifying agent the preparation method is as follows:
(1) 15-25 parts of graphite powders are immersed in the nitric acid solution that mass fraction is 10-30% and is acidified, flow back 4- at 65-85 DEG C
6h removes extra nitric acid solution, and after gained acidifying graphite is cleaned 2-3 times with deionized water, vacuum drying obtains acidification stone
Ink；
(2) 50-100 parts of ethyl alcohol and 25-50 parts of water are dispersed by 8-15 parts of 3- aminopropyl triethoxysilanes in a kettle
In mixed solution, reaction kettle then is added in acidifying graphite obtained in 10-20 parts of white carbon blacks and step (1), it is anti-at 70-90 DEG C
10-13h is answered, ethanol washing is used after reaction, is centrifugally separating to obtain the modifying agent.
2. a kind of high-insulation hv cable termination according to claim 1, which is characterized in that the Nano-meter SiO_22Directly
Diameter is 10nm, specific surface area 150m2/g。
3. a kind of high-insulation hv cable termination according to claim 1, which is characterized in that the nano carbon black is
Conductive carbon black, diameter 100nm, specific surface area 30m2/g。
4. a kind of high-insulation hv cable termination according to claim 1, which is characterized in that the initiator is 2,
5- dimethyl -2,5- bis(t-butylperoxy) hexane.
5. a kind of high-insulation hv cable termination according to claim 1, which is characterized in that the plasticizer is neighbour
Dioctyl phthalate；The silane coupling agent is butadienyl triethoxysilane；The filler is calcinated argil；
The lubricating auxiliary agent is stearic acid；The coagent is three enester of cyamelide；The age resister is double
[(β-(3,5- di-tert-butyl-4-hydroxyl benzyl)-methyl carboxy ethyl)] thioether.
6. a kind of high-insulation hv cable termination according to claim 1, which is characterized in that the vulcanizing agent was
Aoxidize one or more of diisopropylbenzene (DIPB), ethyl thiourea, ethylene thiourea or thiadiazoles derivative.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910424271.2A CN110408131A (en) | 2019-05-21 | 2019-05-21 | A kind of high-insulation hv cable termination |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910424271.2A CN110408131A (en) | 2019-05-21 | 2019-05-21 | A kind of high-insulation hv cable termination |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111875967A (en) * | 2020-06-29 | 2020-11-03 | 安徽浩天新型材料有限公司 | Silicon rubber cable protection pipe |
| WO2024022526A1 (en) * | 2022-07-29 | 2024-02-01 | 江苏亨通高压海缆有限公司 | Preparation method for epdm insulating rubber, and use of epdm insulating rubber |
-
2019
- 2019-05-21 CN CN201910424271.2A patent/CN110408131A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111875967A (en) * | 2020-06-29 | 2020-11-03 | 安徽浩天新型材料有限公司 | Silicon rubber cable protection pipe |
| WO2024022526A1 (en) * | 2022-07-29 | 2024-02-01 | 江苏亨通高压海缆有限公司 | Preparation method for epdm insulating rubber, and use of epdm insulating rubber |
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Application publication date: 20191105 |