CN105625091B - Transformer insulating paper of chitin modification and its preparation method and application - Google Patents
Transformer insulating paper of chitin modification and its preparation method and application Download PDFInfo
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- CN105625091B CN105625091B CN201510976672.0A CN201510976672A CN105625091B CN 105625091 B CN105625091 B CN 105625091B CN 201510976672 A CN201510976672 A CN 201510976672A CN 105625091 B CN105625091 B CN 105625091B
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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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
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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
- 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
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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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
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- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- Spectroscopy & Molecular Physics (AREA)
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Abstract
The invention discloses a kind of transformer insulating paper of chitin modification and its preparation method and application.The transformer insulating paper preparation method of the chitin modification, comprises the following steps：Step 1：Prepare lysate；Step 2：Prepare chitin solution；Step 3：Coating；Step 4：Prebake；Step 5：Drying.The present invention is modified using chitin to transformer insulating paper, is improved the insulating properties of insulating paper, can effectively be increased the service life, and reduces failure rate of insulation, and security performance is high, economic benefit is obvious.
Description
Technical field
The present invention relates to the technical field of insulating paper, in particular to the transformer insulating paper and its system of a kind of chitin modification
Preparation Method and application.
Technical background
In order to ensure electric power regular supply, first to ensure the operation that power network can be safe and reliable, stable.The collapse of power network
Large-area power-cuts event is may result in, this not only can bring very big inconvenience to the normal life of people, it is also possible to cause order to mix
The security incident such as random, heavy losses are caused to country and society.And energy conversion, the nucleus equipment of transmission are exactly electricity in power network
Power transformer, acts on extremely important in whole network system, and it is all trades and professions and thousand for transferring electrical energy into national economy
The key equipment at ten thousand families of family.Therefore power transformer once breaks down in operation, for the safe operation of power system
It is exactly " extinction ".The accident of China's power network in operation mainly based on equipment fault, and wherein equipment fault with
Insulation fault accounting weight is most, there is data to suggest that, from 2001 to 2010, equipment fault account for the half of total accident with
On；Failure in transformer occurs to be at most insulation fault, such as account for becoming in the accident as caused by insulation breakdown in 2004
The 81.1% of the total accident of depressor.
At present, oil-filled transformer is current most widely used transformer in the transformer to be come into operation in China, is accounted for
The ratio highest of operating transformer where at present, and the power transformer in almost all of super (spy) high voltage power transmisson system is all
It is oil-filled transformer；Oil-filled transformer interior insulation system is mainly made up of insulating paper and insulating oil.Insulating paper is wound around
It is fixed insulating materials on each winding of transformer, can not be changed during transformer station high-voltage side bus, current insulating paper
Using common ox-hide insulating paper, disruptive field intensity is relatively low, and insulating properties is limited, but once has overvoltage generation, has exceeded ox-hide
The withstanding voltage of insulating paper, dielectric breakdown accident will occur.Therefore we are increased by improving the insulating properties of insulating paper itself
Add its insulating reliability, reduce insulation damages accident odds in all cases, there is highly important actual meaning
Justice.
The content of the invention
It is an object of the invention to provide a kind of transformer insulating paper of chitin modification and its preparation method and application.Should
Transformer insulating paper uses chitin modification, improves its insulating properties, can effectively increase the service life, and reduces insulation fault
Rate, security performance is high, economic benefit is obvious.
In order to achieve this, a kind of transformer insulating paper preparation method of chitin modification provided by the present invention, it is special
Sign is, comprises the following steps：
Step 1：Lysate is prepared, according to water：Sodium hydroxide：Urea=100：6~10：2~6 part by weight is prepared molten
It is standby to solve liquid, aforementioned proportion is the dissolving most suitable ratio of chitin；
Step 2：Chitin solution is prepared, a certain amount of chitin powder is added in step 1 gained lysate and is configured to
Mass percent concentration is 0.2~2% solution, then freezes 48~72h under conditions of being -50~-20 DEG C in temperature, takes out ice
Block melts, and the solution of thawing then is freezed into 48~72h under conditions of temperature is -50~-20 DEG C again, repeats above-mentioned freezing
Melt operation 2~3 times, until chitin powder is completely dissolved, obtain the chitin solution of clear.Above-mentioned parameter scope can
Preferably to dissolve chitin；
Step 3：Coating, takes an insulating paper, by gained chitin solution even application in step 2 the two of insulating paper
Face, 1~60min is then stood, the design will also consider paper after drying in order that chitin solution is preferably penetrated into paper
Zhang Houdu；
Step 4：Prebake, the insulating paper that step 3 treats is put into baking oven, dried under 50~90 DEG C of temperature conditionss
It is dry, then take out, and 12~24h is soaked with deionized water, deionized water is then outwelled, then new deionized water is changed to, repeat
Immersion 3~4 times, until the pH value of immersion deionized water is 6.5~7.5, the insulating paper after being soaked, above-mentioned 50~90 DEG C
Temperature is adapted to dry paper and surface chitin, and the too low drying rate of temperature is very slow, and temperature is too high strict to instrument requirements, and
Power-consuming, above-mentioned 12~24h of immersion is advantageous to wash away the ion in modified paper, and the too short time washes not thoroughly, oversize and lose time,
Above-mentioned 3~4 clean results of repetition are best, and number has lacked the inside and also had ion presence, does not often have realistic meaning；
Step 5：Drying, the insulating paper after being soaked obtained by step 4 is put into baking oven, under 50~90 DEG C of temperature conditionss
Drying, above-mentioned 50~90 DEG C of temperature drying modified paper is proper, that is, obtains the transformer insulating paper of chitin modification.
Preferably, the transformer insulating paper preparation method of a kind of chitin modification, it is characterised in that including such as
Lower step：
Step 1：Lysate is prepared, according to water：Sodium hydroxide：Urea=100：8：It is standby that 4 part by weight prepares lysate
With；
Step 2：Chitin solution is prepared, a certain amount of chitin powder is added in step 1 gained lysate and is configured to
Mass percent concentration is 0.8~1.5% solution, then freezes 48~72h under conditions of being -30~-20 DEG C in temperature, is taken out
It is ice melting, the solution of thawing is then freezed into 48~72h under conditions of temperature is -30~-20 DEG C again, repeated above-mentioned cold
Freeze thawingization operates 2~3 times, until chitin powder is completely dissolved, obtains the chitin solution of clear；
Step 3：Coating, takes an insulating paper, by step 2 gained chitin solution even application on the two sides of insulating paper,
Then 1~60min is stood；
Step 4：Prebake, the insulating paper that step 3 treats is put into baking oven, dried under 50~90 DEG C of temperature conditionss
It is dry, then take out, and 12~24h is soaked with deionized water, deionized water is then outwelled, then new deionized water is changed to, repeat
Immersion 3~4 times, until the pH value of immersion deionized water is 6.5~7, the insulating paper after being soaked；
Step 5：Drying, the insulating paper after being soaked obtained by step 4 is put into baking oven, under 50~90 DEG C of temperature conditionss
Drying, that is, obtain the transformer insulating paper of chitin modification.
In above-mentioned technical proposal, ice cube is first manually is pounded fragment by the step 2 medium floe melting process, then by fragment
It is put into the agitator of band blade and is sufficiently stirred, until ice cube all melts.
In above-mentioned technical proposal, the dosage of chitin solution is 0.01~0.2mL/ in the coating process of the step 3
cm2, effect is bad very little for chitin solution usage, and apply it is uneven, it is too many to make the dried thickness of paper too
Greatly.
In above-mentioned technical proposal, the dosage of chitin solution is 0.15mL/cm in the coating process of the step 32, the use
It is uniform that amount can be such that chitin solution applies well, and the thickness for drying post-modification paper is moderate.
In above-mentioned technical proposal, the drying time of the step 5 is 24~48h, if time too short paper can not be complete
Drying, also has micro-moisture, influences last paper performance；Time is oversize and wastes the energy, it is not necessary that.
A kind of transformer insulating paper of chitin modification, it is characterised in that the transformer insulating paper of the chitin modification
It is prepared by the transformer insulating paper preparation method of the chitin modification of above-mentioned steps 1~5.
In above-mentioned technical proposal, the disruptive field intensity of the transformer insulating paper of the chitin modification is 16~20kV/mm.
A kind of application of the transformer insulating paper of chitin modification, it is characterised in that for being wrapped in the winding of transformer
Upper formation insulation division, the insulation division are used to prevent overvoltage and/or breakdown.
Compared with prior art, the advantage of the invention is that：The transformer insulating paper uses chitin modification, improves it
It insulating properties, can effectively increase the service life, reduce insulation damages accident odds in all cases, security performance
Height, economic benefit are obvious.In addition, device therefor of the present invention is simple, easy to operate, large-scale production can be achieved, practicality is high.
Embodiment
The present invention is described in further detail for specific examples below：
Embodiment 1：A kind of transformer insulating paper preparation method of chitin modification, comprises the following steps：
Step 1：Lysate is prepared, according to water：Sodium hydroxide：Urea=100：8：It is standby that 4 part by weight prepares lysate
With；
Step 2：Chitin solution is prepared, a certain amount of chitin powder is added in step 1 gained lysate and is configured to
Mass percent concentration is 0.2% solution, then freezes 48h under conditions of being -30 DEG C in temperature, takes out ice melting, ice cube
Melt operation as ice cube is manually first pounded into fragment, then fragment is put into the agitator of band blade and is sufficiently stirred, then will melt
The solution of change freezes 48h under conditions of being again -30 DEG C in temperature, repeats above-mentioned freezing and melts operation 2 times, until chitin powder
End is completely dissolved, and obtains the chitin solution of clear；
Step 3：Coating, takes an insulating paper, by gained chitin solution even application in step 2 the two of insulating paper
Face, the dosage of chitin solution is 0.05mL/cm2, then stand 10min；
Step 4：Prebake, the insulating paper that step 3 treats is put into baking oven, dried under 60 DEG C of temperature conditionss,
Then take out, and 12h soaked with deionized water, then outwell deionized water, then change to new deionized water, repeat immersion 3 times,
Until the pH value of immersion deionized water is 6.5, the insulating paper after being soaked；
Step 5：Drying, the insulating paper after being soaked obtained by step 4 is put into baking oven, dried under 90 DEG C of temperature conditionss
24h, that is, obtain the transformer insulating paper of chitin modification.
After tested, the disruptive field intensity of the transformer insulating paper of chitin modification obtained above is 16.63kV/mm, is compared
13.67% is improved in the disruptive field intensity 14.63kV/mm of common transformer insulating paper.
Embodiment 2：A kind of transformer insulating paper preparation method of chitin modification, comprises the following steps：
Step 1：Lysate is prepared, according to water：Sodium hydroxide：Urea=100：8：It is standby that 4 part by weight prepares lysate
With；
Step 2：Chitin solution is prepared, a certain amount of chitin powder is added in step 1 gained lysate and is configured to
Mass percent concentration is 0.8% solution, then freezes 72h under conditions of being -30 DEG C in temperature, takes out ice melting, ice cube
Melt operation as ice cube is manually first pounded into fragment, then fragment is put into the agitator of band blade and is sufficiently stirred, then will melt
The solution of change freezes 72h under conditions of being again -30 DEG C in temperature, repeats above-mentioned freezing and melts operation 3 times, until chitin powder
End is completely dissolved, and obtains the chitin solution of clear；
Step 3：Coating, takes an insulating paper, by gained chitin solution even application in step 2 the two of insulating paper
Face, the dosage of chitin solution is 0.1mL/cm2, then stand 30min；
Step 4：Prebake, the insulating paper that step 3 treats is put into baking oven, dried under 70 DEG C of temperature conditionss,
Then take out, and 12h soaked with deionized water, then outwell deionized water, then change to new deionized water, repeat immersion 4 times,
Until the pH value of immersion deionized water is 7, the insulating paper after being soaked；
Step 5：Drying, the insulating paper after being soaked obtained by step 4 is put into baking oven, dried under 80 DEG C of temperature conditionss
24h, that is, obtain the transformer insulating paper of chitin modification.
After tested, the disruptive field intensity of the transformer insulating paper of chitin modification obtained above is 18.82kV/mm, is compared
28.63% is improved in the disruptive field intensity 14.63kV/mm of common transformer insulating paper.
Embodiment 3：A kind of transformer insulating paper preparation method of chitin modification, comprises the following steps：
Step 1：Lysate is prepared, according to water：Sodium hydroxide：Urea=100：8：It is standby that 4 part by weight prepares lysate
With；
Step 2：Chitin solution is prepared, a certain amount of chitin powder is added in step 1 gained lysate and is configured to
Mass percent concentration is 1.0% solution, then freezes 72h under conditions of being -30 DEG C in temperature, takes out ice melting, ice cube
Melt operation as ice cube is manually first pounded into fragment, then fragment is put into the agitator of band blade and is sufficiently stirred, then will melt
The solution of change freezes 72h under conditions of being again -30 DEG C in temperature, repeats above-mentioned freezing and melts operation 3 times, until chitin powder
End is completely dissolved, and obtains the chitin solution of clear；
Step 3：Coating, takes an insulating paper, by gained chitin solution even application in step 2 the two of insulating paper
Face, the dosage of chitin solution is 0.15mL/cm2, then stand 1min；
Step 4：Prebake, the insulating paper that step 3 treats is put into baking oven, dried under 80 DEG C of temperature conditionss,
Then take out, and 12h soaked with deionized water, then outwell deionized water, then change to new deionized water, repeat immersion 4 times,
Until the pH value of immersion deionized water is 7, the insulating paper after being soaked；
Step 5：Drying, the insulating paper after being soaked obtained by step 4 is put into baking oven, dried under 90 DEG C of temperature conditionss
48h, that is, obtain the transformer insulating paper of chitin modification.
After tested, the disruptive field intensity of the transformer insulating paper of chitin modification obtained above is 19.15kV/mm, is compared
30.89% is improved in the disruptive field intensity 14.63kV/mm of common transformer insulating paper.
Embodiment 4：A kind of transformer insulating paper preparation method of chitin modification, comprises the following steps：
Step 1：Lysate is prepared, according to water：Sodium hydroxide：Urea=100：10：It is standby that 6 part by weight prepares lysate
With；
Step 2：Chitin solution is prepared, a certain amount of chitin powder is added in step 1 gained lysate and is configured to
Mass percent concentration is 2% solution, then freezes 72h under conditions of being -50 DEG C in temperature, and taking-up is ice melting, and ice cube melts
Change operation as ice cube is manually first pounded into fragment, then fragment is put into the agitator of band blade and is sufficiently stirred, then will melt
Solution be again -50 DEG C in temperature under conditions of freeze 72h, repeat above-mentioned freezing and melt operation 3 times, until chitin powder
It is completely dissolved, obtains the chitin solution of clear；
Step 3：Coating, takes an insulating paper, by gained chitin solution even application in step 2 the two of insulating paper
Face, the dosage of chitin solution is 0.2mL/cm2, then stand 60min；
Step 4：Prebake, the insulating paper that step 3 treats is put into baking oven, dried under 90 DEG C of temperature conditionss,
Then take out, and 24h soaked with deionized water, then outwell deionized water, then change to new deionized water, repeat immersion 4 times,
Until the pH value of immersion deionized water is 7.5, the insulating paper after being soaked；
Step 5：Drying, the insulating paper after being soaked obtained by step 4 is put into baking oven, dried under 90 DEG C of temperature conditionss
48h, that is, obtain the transformer insulating paper of chitin modification.
After tested, the disruptive field intensity of the transformer insulating paper of chitin modification obtained above is 17.05kV/mm, is compared
16.54% is improved in the disruptive field intensity 14.63kV/mm of common transformer insulating paper.
Embodiment 5：A kind of transformer insulating paper preparation method of chitin modification, comprises the following steps：
Step 1：Lysate is prepared, according to water：Sodium hydroxide：Urea=100：6：It is standby that 2 part by weight prepares lysate
With；
Step 2：Chitin solution is prepared, a certain amount of chitin powder is added in step 1 gained lysate and is configured to
Mass percent concentration is 1.5% solution, then freezes 48h under conditions of being -20 DEG C in temperature, takes out ice melting, ice cube
Melt operation as ice cube is manually first pounded into fragment, then fragment is put into the agitator of band blade and is sufficiently stirred, then will melt
The solution of change freezes 48h under conditions of being again -20 DEG C in temperature, repeats above-mentioned freezing and melts operation 2 times, until chitin powder
End is completely dissolved, and obtains the chitin solution of clear；
Step 3：Coating, takes an insulating paper, by gained chitin solution even application in step 2 the two of insulating paper
Face, the dosage of chitin solution is 0.01mL/cm2, then stand 30min；
Step 4：Prebake, the insulating paper that step 3 treats is put into baking oven, dried under 50 DEG C of temperature conditionss,
Then take out, and 12h soaked with deionized water, then outwell deionized water, then change to new deionized water, repeat immersion 3 times,
Until the pH value of immersion deionized water is 7, the insulating paper after being soaked；
Step 5：Drying, the insulating paper after being soaked obtained by step 4 is put into baking oven, dried under 50 DEG C of temperature conditionss
24h, that is, obtain the transformer insulating paper of chitin modification.
After tested, the disruptive field intensity of the transformer insulating paper of chitin modification obtained above is 17.92kV/mm, is compared
22.49% is improved in the disruptive field intensity 14.63kV/mm of common transformer insulating paper.
The content that this specification is not described in detail belongs to prior art known to professional and technical personnel in the field.
Claims (5)
1. the transformer insulating paper preparation method of a kind of chitin modification, it is characterised in that comprise the following steps：
Step 1：Lysate is prepared, according to water：Sodium hydroxide：Urea=100：8：4 part by weight prepares dissolved solution for later use；
Step 2：Chitin solution is prepared, a certain amount of chitin powder is added in step 1 gained lysate and is configured to quality
Percent concentration is 0.2% solution, then freezes 48h under conditions of being -30 DEG C in temperature, and taking-up is ice melting, ice melting
Operate as ice cube is manually first pounded into fragment, then fragment is put into the agitator of band blade and is sufficiently stirred, then by thawing
Solution freezes 48h under conditions of being again -30 DEG C in temperature, repeats above-mentioned freezing and melts operation 2 times, until chitin powder is complete
Fully dissolved, obtain the chitin solution of clear；
Step 3：Coating, takes an insulating paper, by gained chitin solution even application in step 2 in the two sides of insulating paper, first
The dosage of shell element solution is 0.05mL/cm2, then stand 10min；
Step 4：Prebake, the insulating paper that step 3 treats is put into baking oven, dried under 60 DEG C of temperature conditionss, then
Take out, and 12h is soaked with deionized water, then outwell deionized water, then change to new deionized water, repeat immersion 3 times, until
The pH value for soaking deionized water is 6.5, the insulating paper after being soaked；
Step 5：Drying, the insulating paper after being soaked obtained by step 4 is put into baking oven, 24h is dried under 90 DEG C of temperature conditionss,
Obtain the transformer insulating paper of chitin modification；
The step 2 medium floe melting process is that ice cube is manually first pounded into fragment, then fragment is put into the agitator of band blade
In be sufficiently stirred, until ice cube all melt；
The dosage of chitin solution is 0.01~0.2mL/cm in the coating process of the step 32；
The drying time of the step 5 is 24~48h.
2. the transformer insulating paper preparation method of chitin modification according to claim 1, it is characterised in that including as follows
Step：
Step 1：Lysate is prepared, according to water：Sodium hydroxide：Urea=100：8：4 part by weight prepares dissolved solution for later use；
Step 2：Chitin solution is prepared, a certain amount of chitin powder is added in step 1 gained lysate and is configured to quality
Percent concentration is 0.8~1.5% solution, then freezes 48~72h under conditions of being -30~-20 DEG C in temperature, takes out ice cube
Melt, the solution of thawing is then freezed into 48~72h under conditions of temperature is -30~-20 DEG C again, above-mentioned freezing is repeated and melts
Change operation 2~3 times, until chitin powder is completely dissolved, obtain the chitin solution of clear；
Step 3：Coating, takes an insulating paper, by step 2 gained chitin solution even application on the two sides of insulating paper, then
Stand 1~60min；
Step 4：Prebake, the insulating paper that step 3 treats is put into baking oven, dried under 50~90 DEG C of temperature conditionss,
Then take out, and 12~24h is soaked with deionized water, then outwell deionized water, then change to new deionized water, repeat to soak
3~4 times, until the pH value of immersion deionized water is 6.5~7, the insulating paper after being soaked；
Step 5：Drying, the insulating paper after being soaked obtained by step 4 is put into baking oven, dried under 50~90 DEG C of temperature conditionss
It is dry, that is, obtain the transformer insulating paper of chitin modification.
A kind of 3. transformer insulating paper of chitin modification, it is characterised in that the transformer insulating paper of the chitin modification by
The transformer insulating paper preparation method of chitin modification described in claim 1 or 2 is prepared.
4. the transformer insulating paper of chitin modification according to claim 3, it is characterised in that the chitin modification
The disruptive field intensity of transformer insulating paper is 16~20 kV/mm.
5. the application of the transformer insulating paper of a kind of chitin modification according to claim 3 or 4, it is characterised in that use
In forming insulation division on the winding for be wrapped in transformer, the insulation division is used to prevent overvoltage and/or breakdown.
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|---|---|---|---|
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| EP2159322B1 (en) * | 2004-07-06 | 2015-01-21 | International Paper Company | Paper substrates containing an antimicrobial compound as well as methods of making and using the same |
| CN101857684A (en) * | 2010-06-10 | 2010-10-13 | 武汉大学 | Chitin hydrogel and preparation method and application thereof |
| CN101864082B (en) * | 2010-06-10 | 2012-06-27 | 武汉大学 | Preparation method of chitin film |
| CN204753253U (en) * | 2015-06-26 | 2015-11-11 | 浙江凯恩特种材料股份有限公司 | High voltage withstanding electrolytic capacitor paper |
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