CN105949544A - Transformer sealing ring with high wear resistance for electrical use - Google Patents
Transformer sealing ring with high wear resistance for electrical use Download PDFInfo
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- CN105949544A CN105949544A CN201610305611.6A CN201610305611A CN105949544A CN 105949544 A CN105949544 A CN 105949544A CN 201610305611 A CN201610305611 A CN 201610305611A CN 105949544 A CN105949544 A CN 105949544A
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a transformer sealing ring with high wear resistance for electrical use. The sealing ring comprises raw material components in parts by weight as follows: 40-60 parts of styrene-butadiene Rubber, 20-40 parts of chloroprene rubber, 23-26 parts of fluoroether rubber, 0.1-15 parts of graphene, 13-15 parts of phenol formaldehyde resin, 1-10 parts of a silane coupling agent, 12-15 parts of semi-reinforcing furnace black, 10-12 parts of calcined clay, 1-2 parts of magnesium chloride, 1-5 parts of magnesium powder, 5-7 parts of nano-MoS2, 1-10 parts of an anti-aging agent, 0-20 parts of a plasticizer and 1-5 parts of an accelerator. The sealing ring has excellent performance including corrosion resistance, high-temperature resistance, wear resistance, tear resistance and stretching resistance, is long in service life and guarantees the sealing performance between a transformer oil tank and a transformer cover as well as between a casing and the transformer cover.
Description
Technical field
The present invention relates to a kind of electric power high abrasion transformator sealing ring, belong to electrical equipment technical field.
Background technology
Owing to generally all using transformer oil that transformator is lowered the temperature in transformator, therefore, oil tank of transformer and housing and change
Sealing between depressor lid is most important, and traditional transformer ring-shaped rubber sealing member generally uses a bar shaped sealant bars, by its two
End bonds together and makes, the quality of glue row's quality, and the quality of glue row's sealing joint quality all directly affects transformator
Sealing property.Due to the particularity of sealing ring present position, occurring of crack conditions is occurred by the effect of chronic stress,
And being easily subject to high temperature and the corrosiveness of transformer oil, common rubber seal belt work life is the shortest, it is difficult to meet
The longtime running of transformator needs.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of electric power high abrasion transformator sealing ring, and this sealing ring has corrosion resistant
Erosion, high temperature resistant, wear-resistant, anti tear and the excellent properties of stretch-proof, it is ensured that between oil tank of transformer and housing and transformer cover
Sealing property, service life is long.
Technical scheme is as follows:
A kind of electric power high abrasion transformator sealing ring, raw material components is as follows, is weight portion:
Butadiene-styrene rubber 40-60 part, neoprene 20-40 part, fluoroether rubber 23-26 part, Graphene 0.1-15 part, phenolic aldehyde tree
Fat 13-15 part, silane coupler 1-10 part, semi-reinforcing furnace black 12-15 part, calcinated argil 10-12 part, magnesium chloride 1-2 part,
Magnesium powder 1-5 part, nano molybdenum disulfide (MoS2) 5-7 part, age resistor 1-10 part, plasticizer 0-20 part, accelerator 1-5 part.
Currently preferred, semi-reinforcing furnace black, calcinated argil, the particle diameter of magnesium powder are 80-90nm.
Currently preferred, described butadiene-styrene rubber is newborn poly-butylbenzene, the trade mark 1502.
Currently preferred, described silane coupler is Si69, Si747, KH550, KH560, KH570;Preferably,
Described silane coupler is Si69.
Currently preferred, described age resistor is amines antioxidants or phenol antiager, it is preferred that described age resistor is right
Phenylenediamine derivative class age resistor.
Currently preferred, described plasticizer be dioctyl phthalate, dibutyl phthalate, tricresyl phosphate,
One in trioctyl phosphate, di-n-octyl sebacate, dioctyl adipate, stearic acid.All can buy in market.
Currently preferred, described accelerator is thiazole accelerator or sulfenamide type accelerators, it is preferred that described rush
Entering agent is accelerant CZ or accelerator NS.
Currently preferred, electric power high abrasion transformator sealing ring, raw material components is as follows, is weight portion:
Butadiene-styrene rubber 50-58 part, neoprene 22-30 part, fluoroether rubber 24-26 part, Graphene 5-8 part, phenolic resin
13-15 part, silane coupler 1-6 part, semi-reinforcing furnace black 12-13 part, calcinated argil 10-11 part, 1 part of magnesium chloride, magnesium powder
1-3 part, nano molybdenum disulfide (MoS2) 5-6 part, age resistor 4-6 part, plasticizer 1-10 part, accelerator 1-3 part.
The preparation method of above-mentioned electric power high abrasion transformator sealing ring, step is as follows:
(1) molybdenum bisuphide is joined in N-Methyl pyrrolidone, through 1-5 hour prepared molybdenum bisuphide suspension of ultrasonic stripping;
Molybdenum bisuphide with the mass volume ratio of N-Methyl pyrrolidone is: (1-15): 100, unit: g/ml;
(2) preheating banbury to 70-80 DEG C, puts into banbury by butadiene-styrene rubber, neoprene, fluoroether rubber, phenolic resin
Middle banburying 22-24min obtains rubber major ingredient, during play triangle bag 5-8 time, the rubber major ingredient obtained is cooled to 30-35 DEG C,
Add the molybdenum bisuphide suspension that step (1) prepares, be uniformly mixed, obtain mixture A;
(3) mixture A is joined in reflux, adds hexamethylene, be uniformly mixed, be heated to reflux hexamethylene,
Reflux 30-40 minute, filter to obtain solid mixture;The addition of hexamethylene and the mass ratio of butadiene-styrene rubber are (8-10): (2-5);
(4) solid mixture step (3) obtained uses hot nitrogen to dry up, and is transferred in reactor, is subsequently adding graphite
Alkene, semi-reinforcing furnace black, calcinated argil, magnesium chloride, magnesium powder, silane coupler, be heated under the atmosphere of inert gas shielding
50-60 DEG C, stirring reaction 120-150 minute, obtain intermedium;
(5) in the intermedium obtained, add age resistor, plasticizer, accelerator, proceed to after mix homogeneously in rubber mixing machine, refine glue
Temperature 90-100 DEG C, refines 20-30 minute glue time, and discharging after sulfuration in vulcanizer put into by the sizing material after refining glue, uses and transformation
Blank is cut by the annular cutting tool of device structure matching to be sealed;Obtain electric power high abrasion transformator sealing ring.
Currently preferred, in step (4), the temperature of described hot nitrogen is 70-80 DEG C, and described noble gas is nitrogen or argon
Gas, the mixing speed of stirring reaction is 80-100 rev/min.
Currently preferred, in step (5), the condition of sulfuration is for vulcanize at twice, and primary vulcanization temperature is
180-190 DEG C, cure time 10-20 minute, then heat to 220-240 DEG C, carry out second time and vulcanize, during second time sulfuration
Between be 7-10 minute.
The high abrasion transformator sealing ring of the present invention is using butadiene-styrene rubber, butadiene rubber, fluoroether rubber as major ingredient so that the present invention
Transformator sealing ring possess high-weatherability, excellent shock resistance, wear-resisting;Butadiene-styrene rubber, neoprene, fluoroether rubber is at phenol
Under the cooperation of urea formaldehyde, compound merges, and adds silane coupler simultaneously, makes to form firm C-C key between rubber molecule the most further
Constituting " network structure ", on fluoroether rubber molecular backbone, carbon atom link fluorine atom forms that bond length is short, bond energy great C-F key,
And fluorine atom surrounds C-C major key thick and fast, protection main chain is not impacted, is destroyed further, makes the present invention possess high-weatherability
Preferable elasticity, intensity can be had concurrently while good shock resistance;There is between molybdenum bisuphide lamella more weak Van der Waals
Power (lubrication), absorption frictional force of easily riving so that between the direct friction between rubber and rubber reforms between lamella
Connect friction, thus improve the wearability of rubber;Coordinate Graphene, the absorption sulfuration of Graphene large scale lamellar structure simultaneously, extend
Time of scorch, improves the process safety of neoprene, coordinating between molybdenum bisuphide with Graphene, make intermolecular more firmly,
Closely knit, make wearability further enhance, semi-reinforcing furnace black and calcinated argil are as reinforcing agent, it is possible to be sufficient filling with at rubber molecule
Between " network structure " in, drastically increase the anti-wear performance of transformator sealing ring further, metal magnesium powder is filled in rubber
In intermolecular " network structure ", significantly improve the resistance to electrochemical corrosion energy of sealing ring.Silane coupler Si-69 makes
With, " the network knot that above-mentioned reinforcing filler, metal magnesium powder are evenly distributed between the rubber molecule of the present invention can not only be promoted
Structure " in, meanwhile, it is capable to coordinate accelerator to form vulcanizing system, improving vulcanization characteristics, hot nitrogen dries up and makes Graphene, half benefit
Strong furnace black, calcinated argil, magnesium chloride, magnesium powder, contact area between silane coupler and rubber increase, more preferable each spontaneous
Wave the reciprocity between each self-applying and component, improve the elasticity of transformator sealing ring, strengthen shock resistance, at rubber molecule
Between " network structure " in silane coupler Si-69 protection under, reinforcing filler, metal magnesium powder play maximum effect, make
Wearability and resistance to electrochemical corrosion can reach ultimate attainment so that the sealing ring of the present invention have corrosion-resistant, high temperature resistant, wear-resistant,
Anti tear and the excellent properties of stretch-proof, it is ensured that the sealing property between oil tank of transformer and housing and transformer cover, service life
Long.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described, but is not limited to this.
The raw materials used convenient source that is, commercial products in embodiment.
Embodiment 1
A kind of electric power high abrasion transformator sealing ring, raw material components is as follows, is weight portion:
43 parts of butadiene-styrene rubber, neoprene 32 parts, fluoroether rubber 25 parts, Graphene 5 parts, 13 parts of phenolic resin, silane
Coupling agent Si69 5 parts, semi-reinforcing furnace black 13 parts, calcinated argil 11 parts, 1 part of magnesium chloride, magnesium powder 2 parts, nanometer curing
Molybdenum (MoS2) 6 parts, 3 parts of phenylenediamine derivative class age resistor, synthesize plasticizer 8 parts, accelerant CZ 4 parts.
The electric power preparation method of high abrasion transformator sealing ring, step is as follows:
(1) molybdenum bisuphide is joined in N-Methyl pyrrolidone, through 2 hours prepared molybdenum bisuphide suspensions of ultrasonic stripping;
Molybdenum bisuphide with the mass volume ratio of N-Methyl pyrrolidone is: 12:100, unit: g/ml;
(2) preheating banbury to 78 DEG C, puts into butadiene-styrene rubber, neoprene, fluoroether rubber, phenolic resin in banbury
Banburying 23min obtains rubber major ingredient, during play triangle bag 6 times, the rubber major ingredient obtained is cooled to 30 DEG C, add step (1)
The molybdenum bisuphide suspension prepared, is uniformly mixed, obtains mixture A;
(3) mixture A is joined in reflux, adds hexamethylene, be uniformly mixed, be heated to reflux hexamethylene,
Reflux 30-40 minute, filter to obtain solid mixture;The addition of hexamethylene and the mass ratio of butadiene-styrene rubber are 5:1;
(4) solid mixture step (3) obtained uses temperature to be that 72 DEG C of intensification hot nitrogens dry up, and is transferred in reactor,
It is subsequently adding Graphene, semi-reinforcing furnace black, calcinated argil, magnesium chloride, magnesium powder, silane coupler, in the atmosphere of nitrogen protection
Under be heated to 55 DEG C, with rotating speed that mixing speed is 100 revs/min stirring reaction 120 minutes, obtain intermedium;
(5) in the intermedium obtained, add age resistor, plasticizer, accelerator, proceed to after mix homogeneously in rubber mixing machine, refine glue
Temperature 98 DEG C, refines 20 minutes glue time, and discharging after sulfuration in vulcanizer put into by the sizing material after refining glue, and the condition of sulfuration is for dividing two
Secondary vulcanizing, primary vulcanization temperature is 185 DEG C, cure time 17 minutes, then heats to 230 DEG C, carries out second time
Sulfuration, cure time is 8 minutes for the second time.Ring blank is entered by the annular cutting tool using structure matching to be sealed with transformator
Row cutting;Obtain electric power high abrasion transformator sealing ring.
Embodiment 2
A kind of electric power high abrasion transformator sealing ring, raw material components is as follows, is weight portion:
58 parts of butadiene-styrene rubber, neoprene 22 parts, fluoroether rubber 23 parts, Graphene 10 parts, 15 parts of phenolic resin, silicon
Alkane coupling agent Si69 7 parts, semi-reinforcing furnace black 12 parts, calcinated argil 10 parts, 1 part of magnesium chloride, magnesium powder 3 parts, nanometer two sulfur
Change molybdenum (MoS2) 6 parts, 3 parts of phenylenediamine derivative class age resistor, synthesize plasticizer 5 parts, accelerant CZ 3 parts.
Currently preferred, semi-reinforcing furnace black, calcinated argil, the particle diameter of magnesium powder are 80-90nm.
The electric power preparation method of high abrasion transformator sealing ring, step is as follows:
(1) molybdenum bisuphide is joined in N-Methyl pyrrolidone, through 3 hours prepared molybdenum bisuphide suspensions of ultrasonic stripping;
Molybdenum bisuphide with the mass volume ratio of N-Methyl pyrrolidone is: 8:100, unit: g/ml;
(2) preheating banbury to 70-80 DEG C, puts into banbury by butadiene-styrene rubber, neoprene, fluoroether rubber, phenolic resin
Middle banburying 24min obtains rubber major ingredient, during play triangle bag 5 times, the rubber major ingredient obtained is cooled to 35 DEG C, add step
(1) the molybdenum bisuphide suspension prepared, is uniformly mixed, obtains mixture A;
(3) mixture A is joined in reflux, adds hexamethylene, be uniformly mixed, be heated to reflux hexamethylene,
Reflux 32 minutes, filter to obtain solid mixture;The addition of hexamethylene and the mass ratio of butadiene-styrene rubber are 4:1;
(4) hot nitrogen that solid mixture step (3) obtained uses temperature to be 73 DEG C dries up, and is transferred in reactor,
It is subsequently adding Graphene, semi-reinforcing furnace black, calcinated argil, magnesium chloride, magnesium powder, silane coupler, in the atmosphere of nitrogen protection
Under be heated to 59 DEG C, stir reaction 120 minutes with the mixing speeds of 88 revs/min, obtain intermedium;
(5) in the intermedium obtained, add age resistor, plasticizer, accelerator, proceed to after mix homogeneously in rubber mixing machine, refine glue
Temperature 93 DEG C, refines 22 minutes glue time, and discharging after sulfuration in vulcanizer put into by the sizing material after refining glue, and the condition of sulfuration is for dividing two
Secondary vulcanizing, primary vulcanization temperature is 182 DEG C, cure time 20 minutes, then heats to 225 DEG C, carries out second time
Sulfuration, cure time is 10 minutes for the second time.Ring blank is entered by the annular cutting tool using structure matching to be sealed with transformator
Row cutting;Obtain electric power high abrasion transformator sealing ring.
Claims (10)
1. an electric power high abrasion transformator sealing ring, raw material components is as follows, is weight portion:
Butadiene-styrene rubber 40-60 part, neoprene 20-40 part, fluoroether rubber 23-26 part, Graphene 0.1-15 part, phenolic aldehyde tree
Fat 13-15 part, silane coupler 1-10 part, semi-reinforcing furnace black 12-15 part, calcinated argil 10-12 part, magnesium chloride 1-2 part,
Magnesium powder 1-5 part, nano molybdenum disulfide (MoS2) 5-7 part, age resistor 1-10 part, plasticizer 0-20 part, accelerator 1-5 part.
Electric power high abrasion transformator sealing ring the most according to claim 1, it is characterised in that semi-reinforcing furnace black, calcining
Potter's clay, the particle diameter of magnesium powder are 80-90nm, and described butadiene-styrene rubber is newborn poly-butylbenzene, the trade mark 1502.
Electric power high abrasion transformator sealing ring the most according to claim 1, it is characterised in that described silane coupler
For Si69, Si747, KH550, KH560, KH570;Preferably, described silane coupler is Si69.
Electric power high abrasion transformator sealing ring the most according to claim 1, it is characterised in that described age resistor is amine
Class age resistor or phenol antiager, it is preferred that described age resistor is p-phenylene diamine derivative's class age resistor.
Electric power high abrasion transformator sealing ring the most according to claim 1, it is characterised in that currently preferred, institute
The plasticizer stated is dioctyl phthalate, dibutyl phthalate, tricresyl phosphate, trioctyl phosphate, decanedioic acid
One in dioctyl ester, dioctyl adipate, stearic acid.
Electric power high abrasion transformator sealing ring the most according to claim 1, it is characterised in that described accelerator is thiophene
Azole accelerator or sulfenamide type accelerators, it is preferred that described accelerator is accelerant CZ or accelerator NS.
Electric power high abrasion transformator sealing ring the most according to claim 1, it is characterised in that electric power high abrasion transformation
Device sealing ring, raw material components is as follows, is weight portion:
Butadiene-styrene rubber 50-58 part, neoprene 22-30 part, fluoroether rubber 24-26 part, Graphene 5-8 part, phenolic resin
13-15 part, silane coupler 1-6 part, semi-reinforcing furnace black 12-13 part, calcinated argil 10-11 part, 1 part of magnesium chloride, magnesium powder
1-3 part, nano molybdenum disulfide (MoS2) 5-6 part, age resistor 4-6 part, plasticizer 1-10 part, accelerator 1-3 part.
8. the preparation method for high abrasion transformator sealing ring of the electric power described in claim 1, step is as follows:
(1) molybdenum bisuphide is joined in N-Methyl pyrrolidone, through 1-5 hour prepared molybdenum bisuphide suspension of ultrasonic stripping;
Molybdenum bisuphide with the mass volume ratio of N-Methyl pyrrolidone is: (1-15): 100, unit: g/ml;
(2) preheating banbury to 70-80 DEG C, puts into banbury by butadiene-styrene rubber, neoprene, fluoroether rubber, phenolic resin
Middle banburying 22-24min obtains rubber major ingredient, during play triangle bag 5-8 time, the rubber major ingredient obtained is cooled to 30-35 DEG C,
Add the molybdenum bisuphide suspension that step (1) prepares, be uniformly mixed, obtain mixture A;
(3) mixture A is joined in reflux, adds hexamethylene, be uniformly mixed, be heated to reflux hexamethylene,
Reflux 30-40 minute, filter to obtain solid mixture;The addition of hexamethylene and the mass ratio of butadiene-styrene rubber are (8-10): (2-5);
(4) solid mixture step (3) obtained uses hot nitrogen to dry up, and is transferred in reactor, is subsequently adding graphite
Alkene, semi-reinforcing furnace black, calcinated argil, magnesium chloride, magnesium powder, silane coupler, be heated under the atmosphere of inert gas shielding
50-60 DEG C, stirring reaction 120-150 minute, obtain intermedium;
(5) in the intermedium obtained, add age resistor, plasticizer, accelerator, proceed to after mix homogeneously in rubber mixing machine, refine glue
Temperature 90-100 DEG C, refines 20-30 minute glue time, and discharging after sulfuration in vulcanizer put into by the sizing material after refining glue, uses and transformation
Blank is cut by the annular cutting tool of device structure matching to be sealed;Obtain electric power high abrasion transformator sealing ring.
The preparation method of electric power high abrasion transformator sealing ring the most according to claim 8, it is characterised in that step (4)
In, the temperature of described hot nitrogen is 70-80 DEG C, and described noble gas is nitrogen or argon, and the mixing speed of stirring reaction is 80-100
Rev/min.
The preparation method of electric power high abrasion transformator sealing ring the most according to claim 8, it is characterised in that step
(5), in, the condition of sulfuration is for vulcanize at twice, and primary vulcanization temperature is 180-190 DEG C, and cure time 10-20 divides
Clock, then heats to 220-240 DEG C, carries out second time and vulcanizes, and cure time is 7-10 minute for the second time.
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CN201610305611.6A CN105949544A (en) | 2016-05-09 | 2016-05-09 | Transformer sealing ring with high wear resistance for electrical use |
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CN201610305611.6A CN105949544A (en) | 2016-05-09 | 2016-05-09 | Transformer sealing ring with high wear resistance for electrical use |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108034221A (en) * | 2017-12-25 | 2018-05-15 | 全椒县新华机械有限责任公司 | A kind of effective heat-resisting impact resistance sealing ring of diesel engine oil |
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CN102494134A (en) * | 2011-12-15 | 2012-06-13 | 上海市电力公司 | Special sealing ring for oil-immersed power transformer |
CN102993518A (en) * | 2012-11-13 | 2013-03-27 | 安徽文峰电子科技集团有限公司 | Stretch-proof cable sheath insulation material and preparation method thereof |
CN104292798A (en) * | 2014-09-25 | 2015-01-21 | 安徽蓝翔电器成套设备有限公司 | Transformer sealing pad and preparation method thereof |
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CN105238154A (en) * | 2015-09-22 | 2016-01-13 | 安徽皖东化工有限公司 | Marine coating with high wear resistance and manufacturing method thereof |
CN105419180A (en) * | 2015-11-27 | 2016-03-23 | 安徽锦洋氟化学有限公司 | High-performance fluorine rubber composite material |
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CN102494134A (en) * | 2011-12-15 | 2012-06-13 | 上海市电力公司 | Special sealing ring for oil-immersed power transformer |
CN102993518A (en) * | 2012-11-13 | 2013-03-27 | 安徽文峰电子科技集团有限公司 | Stretch-proof cable sheath insulation material and preparation method thereof |
CN104292798A (en) * | 2014-09-25 | 2015-01-21 | 安徽蓝翔电器成套设备有限公司 | Transformer sealing pad and preparation method thereof |
CN104312130A (en) * | 2014-09-25 | 2015-01-28 | 安徽蓝翔电器成套设备有限公司 | Sealing gasket of transformer and preparation method thereof |
CN105017587A (en) * | 2015-07-06 | 2015-11-04 | 安徽创宇电力设备有限公司 | Tear-resistant and wear-resistant flame-retardant insulator |
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CN105419180A (en) * | 2015-11-27 | 2016-03-23 | 安徽锦洋氟化学有限公司 | High-performance fluorine rubber composite material |
Cited By (1)
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CN108034221A (en) * | 2017-12-25 | 2018-05-15 | 全椒县新华机械有限责任公司 | A kind of effective heat-resisting impact resistance sealing ring of diesel engine oil |
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