CN110682615A - NMN insulating paper structure and production process thereof - Google Patents
NMN insulating paper structure and production process thereof Download PDFInfo
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- CN110682615A CN110682615A CN201810721628.9A CN201810721628A CN110682615A CN 110682615 A CN110682615 A CN 110682615A CN 201810721628 A CN201810721628 A CN 201810721628A CN 110682615 A CN110682615 A CN 110682615A
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- insulating paper
- paper
- fiber
- nmn
- polyoxadiazole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/0007—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
- B32B37/003—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality to avoid air inclusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
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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
- H01F27/323—Insulation between winding turns, between winding layers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2554/00—Paper of special types, e.g. banknotes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Insulating Bodies (AREA)
- Paper (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention discloses a structure of NMN insulating paper and a production process thereof, the invention adds inorganic ceramic fiber paper and polyoxadiazole polyester fiber insulating paper on the basis of the traditional NMN insulating paper, the inorganic ceramic fiber paper has stronger paint dipping property, the NMN insulating paper fiber keeps wet after paint dipping, the insulativity and the chemical stability are improved, the polyoxadiazole polyester fiber insulating paper has extremely high heat resistance, the heat resistance grade reaches H (180 degrees), and the mechanical strength and the electrical strength are extremely strong, thereby improving the heat resistance and the mechanical strength of the NMN insulating paper, meanwhile, the production process of the NMN insulating paper provided by the invention reasonably controls the production steps, avoids smearing of adhesive in non-coincident useless areas, avoids the waste of the adhesive, rolls the insulating paper at high temperature, thereby flattening the insulating paper and being convenient for discharging air bubbles, the bonding effect is improved.
Description
Technical Field
The invention relates to the technical field of insulating paper, in particular to a structure of NMN insulating paper and a production process thereof.
Background
The NMN insulating paper is a soft composite material consisting of a middle layer of polyester film and Nomex paper on two sides of the polyester film, has good mechanical properties such as tensile strength and edge tearing resistance and good electrical strength, has smooth surface, and can ensure no fault when an automatic winding inserter is used for producing low-voltage motors, is mainly used for insulating grooves, groove covers and phases in the low-voltage motors, and can also be used for insulating layers of transformers or other electrical appliances, and the existing NMN insulating paper has the following defects: 1, the dipping varnish is poor in performance, the dipping varnish aims to keep the NMN insulating paper fibers wet, high insulation and chemical stability are guaranteed, high mechanical strength is guaranteed, the dipping varnish is affected by the properties of Nomex paper, the traditional NMN insulating paper is poor in dipping varnish performance, the 2 heat resistance level is F level (155 ℃), the insulation temperature level is low, and therefore a structure of the NMN insulating paper and a production process of the NMN insulating paper are provided.
Disclosure of Invention
The invention aims to provide a structure of NMN insulating paper and a production process thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the structure of the NMN insulating paper comprises inorganic ceramic fiber paper, polyaramide fiber paper, a polyester film and polyoxadiazole polyester fiber insulating paper, wherein the inorganic ceramic fiber paper, the polyaramide fiber paper, the polyester film, the polyaramide fiber paper and the polyoxadiazole polyester fiber insulating paper are sequentially arranged from top to bottom, and adhesives are bonded among the inorganic ceramic fiber paper, the polyaramide fiber paper, the polyester film, the polyaramide fiber paper and the polyoxadiazole polyester fiber insulating paper.
Compared with the prior art, the invention has the beneficial effects that: the inorganic ceramic fiber paper and the polyoxadiazole polyester fiber insulating paper are additionally arranged on the basis of the traditional NMN insulating paper, the inorganic ceramic fiber paper has strong paint dipping property, the fibers of the NMN insulating paper are kept wet after paint dipping, the insulativity and the chemical stability are improved, the polyoxadiazole polyester fiber insulating paper has extremely high heat resistance, the heat resistance level reaches H (180 degrees), and the mechanical strength and the electrical strength are extremely high, so that the heat resistance and the mechanical strength of the NMN insulating paper are improved.
A production process of NMN insulating paper comprises the following steps:
the first step is as follows: pre-cutting;
the second step is that: gluing and compounding;
the third step: rolling at high temperature;
the fourth step: rolling and curing;
the fifth step: and (6) cutting and packaging.
Preferably, the first precutting step specifically comprises: and cutting the inorganic ceramic fiber paper, the polyaramide fiber paper, the polyester film and the polyoxadiazole polyester fiber insulating paper according to the length and the width of 10 meters and 2 meters respectively.
Preferably, the second sizing and compounding process specifically comprises the following steps: and uniformly coating the upper surfaces of the aromatic polyamide fiber paper, the polyester film, the aromatic polyamide fiber paper and the polyoxadiazole polyester fiber insulating paper with an adhesive, standing for one minute, and sequentially bonding the inorganic ceramic fiber paper, the aromatic polyamide fiber paper, the polyester film, the aromatic polyamide fiber paper and the polyoxadiazole polyester fiber insulating paper from top to bottom when the adhesive is about to solidify.
Preferably, the third high-temperature rolling process specifically comprises the following steps: and (3) carrying out unidirectional rolling on the attached insulating paper by using a high-temperature roller with the temperature of 150 ℃, and rolling for three times, thereby rolling the insulating paper.
Preferably, the fourth rolling and curing process specifically comprises the following steps: and winding the insulating paper, and naturally cooling and solidifying the insulating paper in a dry and cool environment.
Preferably, the fifth step of slitting and packaging specifically comprises the following steps: cutting according to the length of 5 m and the width of 1 m, and packaging.
Preferably, the adhesive is a high-temperature-resistant epoxy resin EP adhesive.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the inorganic ceramic fiber paper, the aromatic polyamide fiber paper, the polyester film and the polyoxadiazole polyester fiber insulating paper are precut, so that the inorganic ceramic fiber paper, the aromatic polyamide fiber paper, the polyester film and the polyoxadiazole polyester fiber insulating paper can be perfectly attached, the smearing of a non-overlapping useless area adhesive is avoided, the waste of the adhesive is avoided, the insulating paper is rolled at high temperature, the insulating paper is rolled, air bubbles are conveniently discharged, and the adhesive effect is improved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure: 1 inorganic ceramic fiber paper, 2 polyaramide fiber paper, 3 polyester film, 4 polyoxadiazole polyester fiber insulating paper and 5 adhesive.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only one-step sub-embodiments of the present invention, not full-step embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: the structure of the NMN insulating paper comprises inorganic ceramic fiber paper 1, polyaramide fiber paper 2, a polyester film 3 and polyoxadiazole polyester fiber insulating paper 4, wherein the inorganic ceramic fiber paper 1, the polyaramide fiber paper 2, the polyester film 3, the polyaramide fiber paper 2 and the polyoxadiazole polyester fiber insulating paper 4 are sequentially arranged from top to bottom, and adhesives 5 are bonded among the inorganic ceramic fiber paper 1, the polyaramide fiber paper 2, the polyester film 3, the polyaramide fiber paper 2 and the polyoxadiazole polyester fiber insulating paper 4.
The working principle is as follows: during production, the inorganic ceramic fiber paper 1, the aromatic polyamide fiber paper 2, the polyester film 3, the aromatic polyamide fiber paper 2 and the polyoxadiazole polyester fiber insulating paper 4 are sequentially bonded together through the adhesive 5 to form a composite insulating paper.
Specifically, a production process of NMN insulating paper comprises the following steps:
the first step is as follows: pre-cutting;
the second step is that: gluing and compounding;
the third step: rolling at high temperature;
the fourth step: rolling and curing;
the fifth step: and (6) cutting and packaging.
Specifically, the first precutting step is specifically as follows: the inorganic ceramic fiber paper 1, the polyaramide fiber paper 2, the polyester film 3 and the polyoxadiazole polyester fiber insulating paper 4 are cut according to the length and the width of 10 meters and 2 meters respectively, so that subsequent gluing and compounding are facilitated, and the adhesive 5 is prevented from being wasted.
Specifically, the gluing and compounding process in the second step specifically comprises the following steps: uniformly coating an adhesive on the upper surfaces of the aromatic polyamide fiber paper 2, the polyester film 3, the aromatic polyamide fiber paper 2 and the polyoxadiazole polyester fiber insulating paper 4, standing for one minute, and when the adhesive is to be solidified, sequentially attaching the inorganic ceramic fiber paper 1, the aromatic polyamide fiber paper 2, the polyester film 3, the aromatic polyamide fiber paper 2 and the polyoxadiazole polyester fiber insulating paper 4 from top to bottom, so that the adhesive 5 achieves the maximum adhesive effect, and the inorganic ceramic fiber paper 1, the aromatic polyamide fiber paper 2, the polyester film 3, the aromatic polyamide fiber paper 2 and the polyoxadiazole polyester fiber insulating paper 4 are perfectly adhered together.
Specifically, the third high-temperature rolling process specifically comprises the following steps: the high temperature that service temperature is 150 grinds the insulated paper after the laminating and carries out the folk prescription to roll, rolls the cubic to roll up the insulated paper, thereby discharge the bubble, improve bonding effect.
Specifically, the fourth rolling and curing process specifically comprises the following steps: the insulating paper is rolled, placed in a dry and cool environment to be naturally cooled and solidified, and rolled into a cylindrical shape, so that the space is saved.
Specifically, the fifth step of slitting and packaging specifically comprises the following steps: the cutting and packaging are carried out according to the length of 5 meters and the width of 1 meter, thereby being convenient for storage and transportation.
Specifically, the adhesive 5 is a high-temperature-resistant epoxy resin (EP) adhesive, so that the stability of the insulating paper is ensured and pyrolysis is prevented.
The expected effect is as follows: the manufacturing steps of the invention solve the problems of poor paint dipping performance and low heat-resistant grade of the NMN insulating paper by reasonably controlling the operation mode and the temperature.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The structure of NMN insulating paper comprises inorganic ceramic fiber paper, polyaramide fiber paper, a polyester film and polyoxadiazole polyester fiber insulating paper, and is characterized in that: the inorganic ceramic fiber paper, the polyaramide fiber paper, the polyester film, the polyaramide fiber paper and the polyoxadiazole polyester fiber insulating paper are sequentially arranged from top to bottom, and adhesives are bonded among the inorganic ceramic fiber paper, the polyaramide fiber paper, the polyester film, the polyaramide fiber paper and the polyoxadiazole polyester fiber insulating paper.
2. The structure of NMN insulating paper as in claim 1, wherein: the production process of the NMN insulating paper comprises the following steps:
the first step is as follows: pre-cutting;
the second step is that: gluing and compounding;
the third step: rolling at high temperature;
the fourth step: rolling and curing;
the fifth step: and (6) cutting and packaging.
3. The process for producing NMN insulating paper according to claim 2, characterized in that: the first pre-cutting procedure specifically comprises the following steps: and cutting the inorganic ceramic fiber paper, the polyaramide fiber paper, the polyester film and the polyoxadiazole polyester fiber insulating paper according to the length and the width of 10 meters and 2 meters respectively.
4. The process for producing NMN insulating paper according to claim 2, characterized in that: the second step of gluing and compounding specifically comprises the following steps: and uniformly coating the upper surfaces of the aromatic polyamide fiber paper, the polyester film, the aromatic polyamide fiber paper and the polyoxadiazole polyester fiber insulating paper with an adhesive, standing for one minute, and sequentially bonding the inorganic ceramic fiber paper, the aromatic polyamide fiber paper, the polyester film, the aromatic polyamide fiber paper and the polyoxadiazole polyester fiber insulating paper from top to bottom when the adhesive is about to solidify.
5. The process for producing NMN insulating paper according to claim 2, characterized in that: the third high-temperature rolling procedure specifically comprises the following steps: and (3) carrying out unidirectional rolling on the attached insulating paper by using a high-temperature roller with the temperature of 150 ℃, and rolling for three times, thereby rolling the insulating paper.
6. The process for producing NMN insulating paper according to claim 2, characterized in that: the fourth step rolling and curing process specifically comprises the following steps: and winding the insulating paper, and naturally cooling and solidifying the insulating paper in a dry and cool environment.
7. The process for producing NMN insulating paper according to claim 2, characterized in that: the fifth step of slitting and packaging specifically comprises the following steps: cutting according to the length of 5 m and the width of 1 m, and packaging.
8. The structure of NMN insulating paper as in claim 1, wherein: the adhesive is a high-temperature-resistant epoxy resin (EP) adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810721628.9A CN110682615A (en) | 2018-07-04 | 2018-07-04 | NMN insulating paper structure and production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810721628.9A CN110682615A (en) | 2018-07-04 | 2018-07-04 | NMN insulating paper structure and production process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110682615A true CN110682615A (en) | 2020-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810721628.9A Pending CN110682615A (en) | 2018-07-04 | 2018-07-04 | NMN insulating paper structure and production process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114622442A (en) * | 2021-07-05 | 2022-06-14 | 重庆大学 | Novel insulating paper material and preparation method and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201117317Y (en) * | 2007-09-29 | 2008-09-17 | 苏州巨峰绝缘材料有限公司 | Three-layered structure insulated compound material |
| CN201725601U (en) * | 2010-07-21 | 2011-01-26 | 株洲市绝缘材料有限责任公司 | Composite forming piece of polyester film and aromatic polyamide paper |
| CN202394610U (en) * | 2011-12-30 | 2012-08-22 | 吴江市太湖绝缘材料有限公司 | H-class insulating soft composite material |
| CN103745789A (en) * | 2013-11-21 | 2014-04-23 | 昆山市奋发绝缘材料有限公司 | Heatproof high-strength insulating material for motor |
| CN104109984A (en) * | 2013-04-16 | 2014-10-22 | 蓬莱市特种绝缘材料厂 | Polyoxadiazole fiber paper based on polyoxadiazole fiber, and preparation method thereof |
| EP2938493A1 (en) * | 2012-12-27 | 2015-11-04 | Nitto Shinko Corporation | Insulating paper for oil-immersed motors |
-
2018
- 2018-07-04 CN CN201810721628.9A patent/CN110682615A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201117317Y (en) * | 2007-09-29 | 2008-09-17 | 苏州巨峰绝缘材料有限公司 | Three-layered structure insulated compound material |
| CN201725601U (en) * | 2010-07-21 | 2011-01-26 | 株洲市绝缘材料有限责任公司 | Composite forming piece of polyester film and aromatic polyamide paper |
| CN202394610U (en) * | 2011-12-30 | 2012-08-22 | 吴江市太湖绝缘材料有限公司 | H-class insulating soft composite material |
| EP2938493A1 (en) * | 2012-12-27 | 2015-11-04 | Nitto Shinko Corporation | Insulating paper for oil-immersed motors |
| CN104109984A (en) * | 2013-04-16 | 2014-10-22 | 蓬莱市特种绝缘材料厂 | Polyoxadiazole fiber paper based on polyoxadiazole fiber, and preparation method thereof |
| CN103745789A (en) * | 2013-11-21 | 2014-04-23 | 昆山市奋发绝缘材料有限公司 | Heatproof high-strength insulating material for motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114622442A (en) * | 2021-07-05 | 2022-06-14 | 重庆大学 | Novel insulating paper material and preparation method and application thereof |
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Application publication date: 20200114 |
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