CN106320059A - Method for preparing of insulating paper containing modified montmorillonite - Google Patents
Method for preparing of insulating paper containing modified montmorillonite Download PDFInfo
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- CN106320059A CN106320059A CN201610708634.1A CN201610708634A CN106320059A CN 106320059 A CN106320059 A CN 106320059A CN 201610708634 A CN201610708634 A CN 201610708634A CN 106320059 A CN106320059 A CN 106320059A
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- insulating paper
- modified montmorillonoid
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
- H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Paper (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention discloses a method for preparing of insulating paper containing modified montmorillonite. The method comprises the steps of concentrated pulp preparing, modified montmorillonite preparing, modified filler preparing and insulating paper preparing. Compared with existing technology, the preparing method has the following advantages: (1) by modifying montmorillonite first, the invention then make a modification on insulating paper packing and therefore can significantly improve its breakdown strength, reduce its relative dielectric constant and effectively restrain the emergence and development of partial discharge of the oil paper; (2) the modified montmorillonite and insulating paper packing can evenly disperse physically in insulating paper, without occurrence of intercalation or interlaminar delamination phenomenon.
Description
Technical field
The invention belongs to transposed conductor core packaging material field, relate to a kind of insulating paper, particularly relate to a kind of containing changing
The preparation method of the insulating paper of property montmorillonite.
Background technology
Cellulose insulation paper is one of most widely used interior insulant in oil-immersed power transformer, due to the runtime
Between cannot change, its machinery and the quality of insulating properties directly decide the service life of transformator.In real transformer, insulation
Paper is acted on by high electrical-field stressing for a long time, once punctures and will cause transformer fault.If promoting insulating paper
Electric property, just can save the usage amount of insulating paper, extends the working life of insulating paper, reduces the width of transformator oil clearance, enters
And the volume of limiting transformer and core loss.Therefore, the study on the modification carrying out insulating paper is significant.
Montmorillonite is a kind of laminar silicic acid salt additives quite favored by material supply section educational circles now, have bigger serface,
The feature such as high surface and high intensity, has been widely used in the macromolecule polymeric materials such as epoxy resin, polyethylene and polypropylene
In, show excellent electric property.The ginseng literary composition dielectric properties to Epoxy Resin/Montmorillonite (EP/MMT) nano composite material
Being studied, result shows, compared with unmodified pure EP, and the relative dielectric constant of EP/MMT nano composite material and dielectric
Loss value all has reduction in various degree, and the doping of MMT has been slowed down the speed that composite dielectric loss increases with temperature.
Pure Low Density Polyethylene (LDPE) and the electrical treeing performance of different LDPE/MMT sample and direct current inquired in ginseng literary composition
The space charge polar effect affecting laws to various sample electricity tree characteristic under pre-electric field action, finds to add compatilizer
LDPE/MMT nano composite material can preferably suppress the speed of growth of electric branch, and shows the space different from pure LDPE
Charge polarity effect.
Ginseng literary composition analyzes electric branch growth course and the shelf depreciation system of LDPE/MMT nano composite material under constant voltage effect
Meter characteristic, result of the test shows, after with the addition of MMT particle, the electric branch partial discharge quantity of LDPE/MMT composite and electric discharge
Repetitive rate all reduces, and electric branch has obtained effective suppression along the growth of direction of an electric field.Join literary composition systematic study LDPE/MMT and friendship
The connection conductance property of polyethylene/montmorillonite (XLPE/MMT) nano composite material, electrical treeing characteristic, electrical breakdown put spy with resistance to office
Property and space charge characteristic, find that adding certain content MMT can be effectively improved and improve the related electric performance of polymer.
But, up to the present, the research utilizing MMT to be modified cellulose insulation paper also rarely has report.Existing skill
In art, existing laboratory uses MMT to be modified cellulose insulation paper, uses octadecyl ammonium chloride and silicon in modifying process
Alkane coupling agent carries out organic-treating to MMT.The interpolation of result display MMT can significantly improve the breakdown strength of insulating paper, fall
The generation of the relative dielectric constant of low insulation paper, effectively suppression Oil-Paper Insulation shelf depreciation and development.But only with
The insulating paper some of which active component that the method prepares fails to be uniformly distributed with in paper, causes unstable properties.
Summary of the invention
Present invention solves the technical problem that: in order to solve defect of the prior art, it is thus achieved that a kind of electric property is stable, and
The breakdown strength of insulating paper can be significantly improved, reduce the relative dielectric constant of insulating paper, effectively suppression Oil-Paper Insulation office
The generation of portion's electric discharge and the insulating paper of development, the present invention provides the preparation method of a kind of insulating paper containing modified montmorillonoid.
Technical scheme: the preparation method of a kind of insulating paper containing modified montmorillonoid, comprises the steps of
Prepared by the 1st step, concentration paper pulp: deliver to paste mill grinding by pulper after being cracked by cardboard, described fiberizer
Source of the gas be the linear speed difference between 0.5～1.2MPa, chassis and rotor be 5.9～7.5m/s, voltage be 400～520V, three-phase be
55～65Hz, beating pressure is 1.8～4.2kg/cm；Utilize fluffer to carry out discongesting process, then paper pulp after process will be discongested
Concentration is concentrated into 4.8～5.6%；
Prepared by the 2nd step, modified montmorillonoid: by weight, by montmorillonite 19～42 parts, nano zine oxide 11～17 parts,
Sodium chloride 7～16 parts, sodium hydroxide 6～12 parts, magnesium sulfate 1～7 parts, water 22～38 parts of mixing, carry out machinery by suspension and stir
Mixing dispersion, rotating speed is 5000～6400r/min, stirring 10～16 minutes, then ultrasonic disperse 14～obtain modification for 18 minutes and cover de-
Soil；
Prepared by the 3rd step, modified filler: by weight, by modified montmorillonoid 30～70 parts, nano silicon 14～35
Part, bamboo fibre 7～19 and lignin 2～13 mixing, in autoclave, stirring reaction is fully, reaction condition be 2.4～
3.7MPa, 173～265 DEG C, the response time is 12～35 minutes；
Prepared by the 4th step, insulating paper: the concentration paper pulp that the modified filler the 3rd step prepared obtains with low 1 step mixes, and is solving
Stirring 12～18 minutes in device, being placed in sheet forming apparatus by mixture and making quality is 110～140g/m2, thickness be
The l Water Paper base of 0.15～0.26mm；
Hot pressing in hot press sent into by 5th step, the l Water Paper base the 4th step prepared, and hot pressing condition is 17～29MPa, 10
～22 minutes, it being subsequently placed in vacuum drying oven and be dried, vacuum is 0.01～0.02MPa, and temperature is 92～114 DEG C, prepares
Insulating paper containing modified montmorillonoid.
Preferably, prepared by the 1st step, concentration paper pulp: deliver to paste mill grinding, described mill by pulper after being cracked by cardboard
The source of the gas of pulp grinder be the linear speed difference between 0.8MPa, chassis and rotor be 6.9m/s, voltage be 480V, three-phase be 60Hz, making beating
Pressure is 3.8kg/cm；Utilize fluffer to carry out discongesting process, then the concentration of paper pulp is concentrated into 5.2% after discongesting process.
Preferably, prepared by the 2nd step, modified montmorillonoid: by weight, by montmorillonite 36 parts, nano zine oxide 13 parts, chlorine
Changing 12 parts of sodium, sodium hydroxide 9 parts, 5 parts of magnesium sulfate, the mixing of 31 parts of water, suspension is carried out mechanical agitation dispersion, rotating speed is
6000r/min, stirring 13 minutes, then 16 minutes acquisition modified montmorillonoids of ultrasonic disperse.
Preferably, prepared by the 3rd step, modified filler: by weight, by modified montmorillonoid 56 parts, nano silicon 28
Part, bamboo fibre 16 and lignin 11 mix, and in autoclave, fully, reaction condition is 3.2MPa, 245 DEG C, instead in stirring reaction
It is 28 minutes between Ying Shi.
Preferably, prepared by the 4th step, insulating paper: the concentration paper pulp that the modified filler the 3rd step prepared obtains with low 1 step mixes
Closing, stir 17 minutes in dissociation device, being placed in sheet forming apparatus by mixture and making quality is 130g/m2, thickness be
The l Water Paper base of 0.24mm.
Preferably, hot pressing in hot press sent into by the 5th step, the l Water Paper base the 4th step prepared, hot pressing condition be 26MPa,
17 minutes, being subsequently placed in vacuum drying oven and be dried, vacuum is 0.016MPa, and temperature is 106 DEG C, prepares containing modification illiteracy de-
The insulating paper of soil.
Beneficial effect: (1) present invention is by first modified montmorillonoid, then the filler of insulating paper is made modification, it is possible to aobvious
Write the breakdown strength improving insulating paper, reduce the relative dielectric constant of insulating paper, effectively suppression Oil-Paper Insulation shelf depreciation
Generation and development；(2) pass through the modified montmorillonite of the present invention and insulating paper filler can insulate by physical dispersion uniformly
In paper, intercalation or splitting phenomenon is not had to occur.
Detailed description of the invention
Embodiment 1
The preparation method of a kind of insulating paper containing modified montmorillonoid, comprises the steps of
Prepared by the 1st step, concentration paper pulp: deliver to paste mill grinding by pulper after being cracked by cardboard, described fiberizer
Source of the gas be the linear speed difference between 0.5MPa, chassis and rotor be 5.9m/s, voltage be 400V, three-phase be 55Hz, beating pressure be
1.8kg/cm；Utilize fluffer to carry out discongesting process, then the concentration of paper pulp is concentrated into 4.8% after discongesting process；
Prepared by the 2nd step, modified montmorillonoid: by weight, by montmorillonite 19 parts, nano zine oxide 11 parts, sodium chloride 7
Part, sodium hydroxide 6 parts, 1 part of magnesium sulfate, the mixing of 22 parts of water, carry out mechanical agitation dispersion by suspension, rotating speed be 5000r/min,
Stir 10 minutes, then ultrasonic disperse obtains modified montmorillonoid in 14 minutes；
Prepared by the 3rd step, modified filler: by weight, by modified montmorillonoid 30 parts, nano silicon 14 parts, bamboo fibre
Dimension 7 and lignin 2 mix, and in autoclave, fully, reaction condition is 2.4MPa, 173 DEG C, and the response time is 12 in stirring reaction
Minute；
Prepared by the 4th step, insulating paper: the concentration paper pulp that the modified filler the 3rd step prepared obtains with low 1 step mixes, and is solving
Stirring 12 minutes in device, being placed in sheet forming apparatus by mixture and making quality is 110g/m2, thickness be the l Water Paper of 0.15mm
Base；
Hot pressing in hot press sent into by 5th step, the l Water Paper base the 4th step prepared, hot pressing condition be 17MPa, 10 minutes,
Being subsequently placed in vacuum drying oven and be dried, vacuum is 0.01MPa, and temperature is 92 DEG C, prepares the insulation containing modified montmorillonoid
Paper.
Embodiment 2
The preparation method of a kind of insulating paper containing modified montmorillonoid, comprises the steps of
Prepared by the 1st step, concentration paper pulp: deliver to paste mill grinding by pulper after being cracked by cardboard, described fiberizer
Source of the gas be the linear speed difference between 0.8MPa, chassis and rotor be 6.9m/s, voltage be 480V, three-phase be 60Hz, beating pressure be
3.8kg/cm；Utilize fluffer to carry out discongesting process, then the concentration of paper pulp is concentrated into 5.2% after discongesting process；
Prepared by the 2nd step, modified montmorillonoid: by weight, by montmorillonite 36 parts, nano zine oxide 13 parts, sodium chloride 12
Part, sodium hydroxide 9 parts, 5 parts of magnesium sulfate, the mixing of 31 parts of water, carry out mechanical agitation dispersion by suspension, rotating speed be 6000r/min,
Stir 13 minutes, then ultrasonic disperse obtains modified montmorillonoid in 16 minutes；
Prepared by the 3rd step, modified filler: by weight, by modified montmorillonoid 56 parts, nano silicon 28 parts, bamboo fibre
Dimension 16 and lignin 11 mix, and in autoclave, fully, reaction condition is 3.2MPa, 245 DEG C in stirring reaction, and the response time is
28 minutes；
Prepared by the 4th step, insulating paper: the concentration paper pulp that the modified filler the 3rd step prepared obtains with low 1 step mixes, and is solving
Stirring 17 minutes in device, being placed in sheet forming apparatus by mixture and making quality is 130g/m2, thickness be the l Water Paper of 0.24mm
Base；
Hot pressing in hot press sent into by 5th step, the l Water Paper base the 4th step prepared, hot pressing condition be 26MPa, 17 minutes,
Being subsequently placed in vacuum drying oven and be dried, vacuum is 0.016MPa, and temperature is 106 DEG C, prepares and contains the exhausted of modified montmorillonoid
Edge paper.
Embodiment 3
The preparation method of a kind of insulating paper containing modified montmorillonoid, comprises the steps of
Prepared by the 1st step, concentration paper pulp: deliver to paste mill grinding by pulper after being cracked by cardboard, described fiberizer
Source of the gas be the linear speed difference between 1.2MPa, chassis and rotor be 7.5m/s, voltage be 520V, three-phase be 65Hz, beating pressure be
4.2kg/cm；Utilize fluffer to carry out discongesting process, then the concentration of paper pulp is concentrated into 5.6% after discongesting process；
Prepared by the 2nd step, modified montmorillonoid: by weight, by montmorillonite 42 parts, nano zine oxide 17 parts, sodium chloride 16
Part, sodium hydroxide 12 parts, 7 parts of magnesium sulfate, the mixing of 38 parts of water, carry out mechanical agitation dispersion by suspension, and rotating speed is 6400r/
Min, stirring 16 minutes, then 18 minutes acquisition modified montmorillonoids of ultrasonic disperse；
Prepared by the 3rd step, modified filler: by weight, by modified montmorillonoid 70 parts, nano silicon 35 parts, bamboo fibre
Dimension 19 and lignin 13 mix, and in autoclave, fully, reaction condition is 3.7MPa, 265 DEG C in stirring reaction, and the response time is
35 minutes；
Prepared by the 4th step, insulating paper: the concentration paper pulp that the modified filler the 3rd step prepared obtains with low 1 step mixes, and is solving
Stirring 18 minutes in device, being placed in sheet forming apparatus by mixture and making quality is 140g/m2, thickness be the l Water Paper of 0.26mm
Base；
Hot pressing in hot press sent into by 5th step, the l Water Paper base the 4th step prepared, hot pressing condition be 29MPa, 22 minutes,
Being subsequently placed in vacuum drying oven and be dried, vacuum is 0.02MPa, and temperature is 114 DEG C, prepares the insulation containing modified montmorillonoid
Paper.
The performance of the insulating paper of the modified montmorillonoid that embodiment 1～3 prepares is detected, wherein the anti-tensile of paper
The AT-L-1 type tensile testing machine measuring employing Jinan An Nimaite Instrument Ltd. of intensity, maximum pull 500N.According to
In ISO1924-2:1994, GB/T 12,914 2008, constant rate of extension method is measured, principle: tensile strength test instrument is at constant rate of extension
Under conditions of, the sample of given size is stretched to fracture, measures its tension stress.Sample width 15mm, tensile testing machine folder away from
10cm, rupture time is (20 ± 5) s.
The breakdown voltage test of paper, insulating paper power frequency disruptive field intensity is carried out according to GB/T 1,408 2006, uses No. 25
Mineral oil, as surrounding media, tests 10～20s breakdown strengths of sample when insulating paper boosts continuously.Test transform capacity is
50kVA/50kV, test voltage 220V, the rate of rise is 500V/s.Measure sample quantities 6, last averaged every time.
Test ambient temperature 25 DEG C, relative temperature 50%.
Insulating paper dielectric properties use Concept80 broadband dielectric spectrum testing system (Novocontrol GmbH) test absolutely
Volume conductance in the dielectric spectroscopy of edge paper, frequency domain dielectric loss spectrum and frequency domain；Insulate according to IEC 60093 standard testing simultaneously
Paper direct current volume conductance.The insulating paper of good for leaching oil is taken out from oil, cleans excess surface insulating oil, be placed on two panels diameter
Measure in the middle of the gold plated copper electrode of 4cm.Measuring frequency range is 10-2～107.For guarantee test repeatability, test every time
Test 2～3 times, and in order to get rid of occasionality, what repeated measure used is not that same sample is tested, but to same
The sample 2 of kind of state～carry out for 3 times testing and choose the good data of repeatability and be analyzed.
Result is as shown in the table:
Claims (6)
1. the preparation method of the insulating paper containing modified montmorillonoid, it is characterised in that comprise the steps of
Prepared by the 1st step, concentration paper pulp: deliver to paste mill grinding, the source of the gas of described fiberizer by pulper after being cracked by cardboard
Be the linear speed difference between 0.5～1.2MPa, chassis and rotor be 5.9～7.5m/s, voltage be 400～520V, three-phase be 55～
65Hz, beating pressure are 1.8～4.2kg/cm；Utilize fluffer to carry out discongesting process, then the concentration of paper pulp after process will be discongested
It is concentrated into 4.8～5.6%；
Prepared by the 2nd step, modified montmorillonoid: by weight, by montmorillonite 19～42 parts, nano zine oxide 11～17 parts, chlorination
Sodium 7～16 parts, sodium hydroxide 6～12 parts, magnesium sulfate 1～7 parts, water 22～38 parts of mixing, carry out mechanical agitation by suspension and divide
Dissipating, rotating speed is 5000～6400r/min, stirring 10～16 minutes, then ultrasonic disperse 14～obtain modified montmorillonoid in 18 minutes；
Prepared by the 3rd step, modified filler: by weight, by modified montmorillonoid 30～70 parts, nano silicon 14～35 parts,
Bamboo fibre 7～19 and lignin 2～13 mixing, in autoclave, fully, reaction condition is 2.4～3.7MPa in stirring reaction,
173～265 DEG C, the response time is 12～35 minutes；
Prepared by the 4th step, insulating paper: the concentration paper pulp that the modified filler the 3rd step prepared obtains with low 1 step mixes, at dissociation device
Middle stirring 12～18 minutes, being placed in sheet forming apparatus by mixture and making quality is 110～140g/m2, thickness be 0.15～
The l Water Paper base of 0.26mm；
Hot pressing in hot press sent into by 5th step, the l Water Paper base the 4th step prepared, and hot pressing condition is 17～29MPa, 10～22
Minute, it being subsequently placed in vacuum drying oven and be dried, vacuum is 0.01～0.02MPa, and temperature is 92～114 DEG C, prepares and contains
The insulating paper of modified montmorillonoid.
The preparation method of a kind of insulating paper containing modified montmorillonoid the most according to claim 1, it is characterised in that the 1st
Prepared by step, concentration paper pulp: delivering to paste mill grinding by pulper after being cracked by cardboard, the source of the gas of described fiberizer is
Linear speed difference between 0.8MPa, chassis and rotor is 6.9m/s, voltage is 480V, three-phase is 60Hz, beating pressure is 3.8kg/
cm；Utilize fluffer to carry out discongesting process, then the concentration of paper pulp is concentrated into 5.2% after discongesting process.
The preparation method of a kind of insulating paper containing modified montmorillonoid the most according to claim 1, it is characterised in that the 2nd
Prepared by step, modified montmorillonoid: by weight, by montmorillonite 36 parts, nano zine oxide 13 parts, 12 parts of sodium chloride, sodium hydroxide 9
Part, 5 parts of magnesium sulfate, the mixing of 31 parts of water, carry out mechanical agitation dispersion by suspension, and rotating speed is 6000r/min, stirs 13 minutes,
Ultrasonic disperse obtains modified montmorillonoid in 16 minutes again.
The preparation method of a kind of insulating paper containing modified montmorillonoid the most according to claim 1, it is characterised in that the 3rd
Prepared by step, modified filler: by weight, by modified montmorillonoid 56 parts, nano silicon 28 parts, bamboo fibre 16 and lignin 11
Mixing, in autoclave, fully, reaction condition is 3.2MPa, 245 DEG C, and the response time is 28 minutes in stirring reaction.
The preparation method of a kind of insulating paper containing modified montmorillonoid the most according to claim 1, it is characterised in that the 4th
Prepared by step, insulating paper: the concentration paper pulp that the modified filler the 3rd step prepared obtains with low 1 step mixes, and stirs 17 in dissociation device
Minute, being placed in sheet forming apparatus by mixture and making quality is 130g/m2, thickness be the l Water Paper base of 0.24mm.
The preparation method of a kind of insulating paper containing modified montmorillonoid the most according to claim 1, it is characterised in that the 5th
Hot pressing in hot press sent into by step, the l Water Paper base that the 4th step prepared, hot pressing condition be 26MPa, 17 minutes, be subsequently placed in true
Being dried in empty drying baker, vacuum is 0.016MPa, and temperature is 106 DEG C, prepares the insulating paper containing modified montmorillonoid.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108505374A (en) * | 2018-04-22 | 2018-09-07 | 雷春生 | A kind of preparation method of modified cellulose insulating paper |
| CN110752073A (en) * | 2019-11-01 | 2020-02-04 | 邝少毅 | Preparation method of cable insulation failure repair material |
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| WO2016112523A1 (en) * | 2015-01-16 | 2016-07-21 | 阿尔斯通技术有限公司 | Nanometer aluminium oxide modified insulation paper and preparation method thereof |
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| CN104131494A (en) * | 2014-07-29 | 2014-11-05 | 哈尔滨理工大学 | Nonlinear insulation board based on nano modification and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108505374A (en) * | 2018-04-22 | 2018-09-07 | 雷春生 | A kind of preparation method of modified cellulose insulating paper |
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| CN110752073A (en) * | 2019-11-01 | 2020-02-04 | 邝少毅 | Preparation method of cable insulation failure repair material |
| CN110752073B (en) * | 2019-11-01 | 2021-01-12 | 深圳联颖通讯有限公司 | Preparation method of cable insulation failure repair material |
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| CN106320059B (en) | 2018-01-19 |
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