CN111926618A - Preparation method of diaphragm paper for gold capacitor - Google Patents

Preparation method of diaphragm paper for gold capacitor Download PDF

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Publication number
CN111926618A
CN111926618A CN202010775681.4A CN202010775681A CN111926618A CN 111926618 A CN111926618 A CN 111926618A CN 202010775681 A CN202010775681 A CN 202010775681A CN 111926618 A CN111926618 A CN 111926618A
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China
Prior art keywords
slurry
pulp
water
paper
beating
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CN202010775681.4A
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Chinese (zh)
Inventor
苗红
刘俊杰
杜秀
许传波
朱晓红
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Sinolight Special Fiber Products Co Ltd
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Sinolight Special Fiber Products Co Ltd
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H27/00Special paper not otherwise provided for, e.g. made by multi-step processes
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H13/00Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/02Synthetic cellulose fibres
    • D21H13/08Synthetic cellulose fibres from regenerated cellulose
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H13/00Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10Organic non-cellulose fibres
    • D21H13/20Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/22Condensation polymers of aldehydes or ketones
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20Macromolecular organic compounds
    • D21H17/33Synthetic macromolecular compounds
    • D21H17/34Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20Macromolecular organic compounds
    • D21H17/33Synthetic macromolecular compounds
    • D21H17/46Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/53Polyethers; Polyesters
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • D21H21/06Paper forming aids
    • D21H21/08Dispersing agents for fibres
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/52Separators

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Paper (AREA)

Abstract

The application provides a preparation method of diaphragm paper for gold capacitors, which comprises the following steps: (1) cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water to be defibered and dispersed to prepare pulp A with the concentration of 1.8-20.0 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; (2) adding water to vinylon fibers, and performing defibering, dispersing and pulping treatment to obtain a slurry C; (3) mixing and stirring the slurry B and the slurry C uniformly according to a proportion to obtain a slurry D; (4) adding a dispersing agent into the slurry D, and uniformly mixing and stirring to obtain slurry E; (5) using water as a medium, making the pulp E, and obtaining finished paper through pressing and drying processes; (6) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor. The diaphragm paper for the gold capacitor prepared by the method has high porosity and uniform pore size distribution, and is beneficial to improving the performance of the gold capacitor.

Description

Preparation method of diaphragm paper for gold capacitor
Technical Field
The application relates to the technical field of diaphragm paper manufacturing, in particular to a preparation method of diaphragm paper for a gold capacitor.
Background
The gold capacitor is a power supply device, the power supply is arranged between the capacitor and the battery, and the physical and chemical changes are not generated during the period of storing electric energy, so that the gold capacitor can be charged for dozens of thousands of times, and is a clean, high-efficiency and large-capacity power supply device. The diaphragm is one of the important components of the gold capacitor, and the quality of the performance of the gold capacitor is determined to a certain extent. The diaphragm prepared by the traditional preparation method has the problems of low porosity and uneven pore size distribution, which can affect the performance of the gold capacitor. Therefore, the research on a method for preparing the gold diaphragm paper for the capacitor with higher porosity and uniform pore size distribution is of great significance.
Disclosure of Invention
The present application aims to solve the above problems and provide a method for preparing a separator paper for gold capacitors.
The application provides a preparation method of diaphragm paper for gold capacitors, which comprises the following steps:
(1) cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water to be defibered and dispersed to prepare pulp A with the concentration of 1.8-20.0 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 70-90 DEG SR, and the wet weight is 2.5-24.0 g;
(2) adding water to vinylon fibers, and performing defibering, dispersing and pulping treatment to obtain a slurry C;
(3) mixing and stirring the slurry B and the slurry C uniformly according to a proportion to obtain slurry D, wherein the proportion of the slurry B is 90-100%, and the proportion of the slurry C is 0-10%;
(4) adding a dispersing agent into the slurry D, and uniformly mixing and stirring to obtain slurry E, wherein the using amount of the dispersing agent is 0-0.04% relative to the weight of the oven-dried slurry;
(5) using water as a medium, making the pulp E, and obtaining finished paper through pressing and drying processes;
(6) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
According to the technical scheme provided by some embodiments of the present application, the water added in step (1), step (2) and step (5) is deionized water.
According to the technical scheme provided by certain embodiments of the application, the beating concentration of the pulp C is 13 DEG SR, and the wet weight is 7.6 g.
According to the technical scheme provided by certain embodiments of the application, the dispersing agent is one of polyethylene oxide or polyacrylamide.
According to the technical scheme provided by some embodiments of the application, when the pulp B is made by using water as a medium in the step (5), a fourdrinier machine or a cylinder machine is used for making the pulp.
Compared with the prior art, the beneficial effect of this application: according to the diaphragm paper for the gold capacitor, which is prepared by the preparation method, the main fibers play a skeleton role in the diaphragm, the main fibers are devillicate to form micro fibers, and a stable three-dimensional structure is formed between the main fibers and the micro fibers, so that the diaphragm has a good pore structure, the porosity of the diaphragm is improved, and the diaphragm has high mechanical strength; meanwhile, the fiber diameter and the pore size are uniformly distributed and uniform, so that the phenomenon of nonuniform pore distribution of the traditional diaphragm paper is effectively improved; in addition, the cellulose contains more water-absorbing hydroxyl functional groups, so that the diaphragm has a better liquid-absorbing effect, and the quick exchange of anions and cations in the charging and discharging processes can be realized, thereby being beneficial to improving the performance of the gold capacitor.
Drawings
Fig. 1 is a flowchart of a method for preparing a separator paper for gold capacitors according to an embodiment of the present application.
Detailed Description
The following detailed description of the present application is given for the purpose of enabling those skilled in the art to better understand the technical solutions of the present application, and the description in this section is only exemplary and explanatory, and should not be taken as limiting the scope of the present application in any way.
The application provides a preparation method of diaphragm paper for gold capacitors, the flow chart of the method is shown in figure 1, and the preparation method is described by combining specific examples.
Example 1
A method for preparing a separator paper for gold capacitors, which comprises the following steps:
(1) cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water to be defibered and dispersed to prepare pulp A with the concentration of 1.8 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 70 DEG SR, and the wet weight is 7.52 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 2
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water to be defibered and dispersed to prepare pulp A with the concentration of 1.8 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 75 DEG SR, and the wet weight is 5.64 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 3
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water to be defibered and dispersed to prepare pulp A with the concentration of 1.8 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 80 DEG SR, and the wet weight is 4.04 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 4
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water to be defibered and dispersed to prepare pulp A with the concentration of 1.8 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 85 DEG SR, and the wet weight is 3.51 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 5
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water to be defibered and dispersed to prepare pulp A with the concentration of 1.8 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 90 DEG SR, and the wet weight is 2.5 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 6
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water, defibered and dispersed to prepare slurry A with the concentration of 20 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 70 DEG SR, and the wet weight is 23.3 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 7
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water, defibered and dispersed to prepare slurry A with the concentration of 20 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 75 DEG SR, and the wet weight is 17.1 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 8
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water, defibered and dispersed to prepare slurry A with the concentration of 20 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 80 DEG SR, and the wet weight is 15.2 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 9
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water, defibered and dispersed to prepare slurry A with the concentration of 20 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 85 DEG SR, and the wet weight is 12.0 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 10
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water, defibered and dispersed to prepare slurry A with the concentration of 20 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 90 DEG SR, and the wet weight is 3.87 g;
(2) using water as a medium, papermaking the slurry B by using a fourdrinier machine, and obtaining finished paper through pressing and drying processes;
(3) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1) and the step (2) is deionized water.
Example 11
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water, defibered and dispersed to prepare slurry A with the concentration of 20 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 85 DEG SR, and the wet weight is 15.2 g;
(2) adding water into vinylon fibers, and carrying out defibering, dispersing and pulping treatment to obtain a pulp C, wherein the pulping concentration of the pulp C is 13 DEG SR, and the wet weight is 7.6 g;
(3) mixing and stirring the slurry B and the slurry C uniformly according to a ratio to obtain a slurry D, wherein the ratio of the slurry B is 95%, and the ratio of the slurry C is 5%;
(4) adding a dispersant into the slurry D, and uniformly mixing and stirring to obtain a slurry E, wherein the adopted dispersant is polyacrylamide, and the dosage of the dispersant is 0.04 percent relative to the weight of the oven-dried slurry;
(5) using water as a medium, papermaking the pulp E by a cylinder paper machine, and obtaining finished paper through pressing and drying processes;
(6) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1), the step (2) and the step (5) is deionized water.
Example 12
(1) Cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water, defibered and dispersed to prepare slurry A with the concentration of 20 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 85 DEG SR, and the wet weight is 15.2 g;
(2) adding water into vinylon fibers, and carrying out defibering, dispersing and pulping treatment to obtain a pulp C, wherein the pulping concentration of the pulp C is 13 DEG SR, and the wet weight is 7.6 g;
(3) mixing and stirring the slurry B and the slurry C uniformly according to a proportion to obtain a slurry D, wherein the proportion of the slurry B is 90%, and the proportion of the slurry C is 10%;
(4) adding a dispersant into the slurry D, and uniformly mixing and stirring to obtain a slurry E, wherein the adopted dispersant is polyacrylamide, and the dosage of the dispersant is 0.04 percent relative to the weight of the oven-dried slurry;
(5) using water as a medium, papermaking the pulp E by a cylinder paper machine, and obtaining finished paper through pressing and drying processes;
(6) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
Wherein, the water added in the step (1), the step (2) and the step (5) is deionized water.
Performance testing
The separator paper for gold capacitor prepared in the above examples 1 to 12 was tested for thickness, tensile strength, air permeability, porosity, ESR (internal resistance) and CAP (capacitance) under a test environment of 23 ℃ and 50% RH; then, the gold capacitor is made into a 10F super capacitor by using diaphragm paper, and the super capacitor is charged at 2.7V and 0.8A at room temperature and discharged at 0.8A. The ESR change times and C change rate were measured after charging at +70 ℃ at 2.7V for 1000 hours, and the comparison of the measured results with the target values is shown in table 1.
TABLE 1
Figure BDA0002618293400000061
Figure BDA0002618293400000071
As can be seen from table 1, the performance indexes of the gold capacitor separator paper prepared in examples 1 to 12 of the present invention all meet the requirements of target values, and the test results of 12 schemes show that the gold capacitor separator paper produced by the method has high porosity and high mechanical strength.
The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are no specific structures which are objectively limitless due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the technical features mentioned above can be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other instances, which may or may not be practiced, are intended to be within the scope of the present application.

Claims (5)

1. A preparation method of diaphragm paper for gold capacitors is characterized by comprising the following steps:
(1) cellulose fiber with the fineness of 1.5dtex and the length of 5mm is added with water to be defibered and dispersed to prepare pulp A with the concentration of 1.8-20.0 percent; beating the pulp A by a beating machine to carry out devillicate brooming to obtain pulp B; the beating degree of the slurry B is 70-90 DEG SR, and the wet weight is 2.5-24.0 g;
(2) adding water to vinylon fibers, and performing defibering, dispersing and pulping treatment to obtain a slurry C;
(3) mixing and stirring the slurry B and the slurry C uniformly according to a proportion to obtain slurry D, wherein the proportion of the slurry B is 90-100%, and the proportion of the slurry C is 0-10%;
(4) adding a dispersing agent into the slurry D, and uniformly mixing and stirring to obtain slurry E, wherein the using amount of the dispersing agent is 0-0.04% relative to the weight of the oven-dried slurry;
(5) using water as a medium, making the pulp E, and obtaining finished paper through pressing and drying processes;
(6) and carrying out surface finishing treatment on the finished paper to obtain the diaphragm paper for the gold capacitor.
2. The method for preparing a separator paper for gold capacitors as claimed in claim 1, wherein the water added in step (1), step (2) and step (5) is deionized water.
3. The method for preparing separator paper for gold capacitors as claimed in claim 1, wherein the pulp C has a beating concentration of 13 ° SR and a wet weight of 7.6 g.
4. The method for preparing separator paper for gold capacitors as claimed in claim 1, wherein the dispersant is one of polyethylene oxide and polyacrylamide.
5. The method for preparing separator paper for gold capacitors as claimed in claim 1, wherein the pulp B is made by a fourdrinier machine or a cylinder machine in the step (5) using water as a medium.
CN202010775681.4A 2020-08-05 2020-08-05 Preparation method of diaphragm paper for gold capacitor Pending CN111926618A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1553462A (en) * 2003-12-19 2004-12-08 南京双登科技发展研究院有限公司 Diaphragm of supercapacitor
CN108978322A (en) * 2018-09-11 2018-12-11 浙江凯恩特种材料股份有限公司 One kind is enhanced to exempt from the solid electrolytic capacitor paper and preparation method thereof that is carbonized
CN109235137A (en) * 2018-09-11 2019-01-18 浙江凯恩特种材料股份有限公司 A kind of coating is enhanced to exempt from the solid electrolytic capacitor paper and preparation method thereof that is carbonized
CN110656529A (en) * 2019-09-12 2020-01-07 中国制浆造纸研究院有限公司 Fine fiber, preparation method and application thereof, and preparation method of diaphragm for electrical equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1553462A (en) * 2003-12-19 2004-12-08 南京双登科技发展研究院有限公司 Diaphragm of supercapacitor
CN108978322A (en) * 2018-09-11 2018-12-11 浙江凯恩特种材料股份有限公司 One kind is enhanced to exempt from the solid electrolytic capacitor paper and preparation method thereof that is carbonized
CN109235137A (en) * 2018-09-11 2019-01-18 浙江凯恩特种材料股份有限公司 A kind of coating is enhanced to exempt from the solid electrolytic capacitor paper and preparation method thereof that is carbonized
CN110656529A (en) * 2019-09-12 2020-01-07 中国制浆造纸研究院有限公司 Fine fiber, preparation method and application thereof, and preparation method of diaphragm for electrical equipment

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