KR20140053258A - Method for producing papermaking feedstock, papermaking feedstock obtained thereby, and heat-resistant electrical insulation sheet material using the feedstock - Google Patents
Method for producing papermaking feedstock, papermaking feedstock obtained thereby, and heat-resistant electrical insulation sheet material using the feedstock Download PDFInfo
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- KR20140053258A KR20140053258A KR1020147005495A KR20147005495A KR20140053258A KR 20140053258 A KR20140053258 A KR 20140053258A KR 1020147005495 A KR1020147005495 A KR 1020147005495A KR 20147005495 A KR20147005495 A KR 20147005495A KR 20140053258 A KR20140053258 A KR 20140053258A
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- aramid
- heat
- papermaking
- paper
- raw material
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/60—Composite insulating bodies
-
- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
-
- 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
Abstract
The present invention provides a method for producing a raw material for papermaking comprising hydrolyzing an aramid synthetic paper which is formed by mixing with fibrids and / or short fibers formed of an aromatic polyamide and subjected to calendaring. This production method is a method for producing a raw material for papermaking which can be reused as raw material for papermaking without using calendered aramid paper as a chemical solution or the like.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recycling method of calendered aramid paper and a heat-resistant electrical insulating sheet material. More particularly, the present invention relates to a calendered recycling method of aramid paper and a heat-resistant electrical insulating sheet material which enable recycling of calendared aramid paper that is incinerated or disposed of without using a chemical solution or the like.
Paper made from high performance materials capable of imparting improved strength and / or thermal stability to paper has been developed. For example, Aramid is a synthetic paper made of aromatic polyamide and has been used as a base for electrical insulation materials and aircraft honeycomb due to its excellent heat resistance, flame retardancy, electrical insulation, toughness and flexibility. Among these materials, paper comprising Nomex (R) fibers of DuPont (USA) is obtained by mixing poly (metaphenylene isophthalamide) prok and fibrids in water, Followed by grinding the mixed slurry, followed by calendaring. This paper is known to have not only high strength and toughness, but also excellent electrical insulation even at high temperatures.
Since the high-temperature and high-pressure treatment by the calendering is carried out on the scouring material and the breakage material of the aramid paper, incineration or disposal is carried out because it is not fizzled by water at all. In addition, after being dissolved in an organic solvent, chemical recycling is again carried out in which raw materials such as grass, fibrids, and pulp, which are grass raw materials, are used like pure raw materials. However, this method requires environmental considerations and tends to be costly .
Further, Patent Document 1 or 2 discloses a treatment method of reclaimed dried aramid paper or aramid board which is not subjected to high temperature and high pressure treatment by calendering. However, since the actual aramid yarn is often calendered and used, it is difficult to say that these methods are practical.
In Patent Document 3, it is described that aramid paper pulp obtained by pulverizing aramid paper is used to produce a porous aramid molding by mixing and grinding the nonwoven fabric with non-aramid fibers at a weight ratio of 90/10 to 10/90, This molded product is considered to be insufficient in electric insulation because of its porosity.
An object of the present invention is to provide a method for producing a raw material for papermaking which can be reused as a papermaking raw material without using calendered aramid paper with a chemical solution or the like.
It is another object of the present invention to provide a papermaking raw material produced from calendered aramid paper.
The present invention also aims to provide a heat-resistant electrically insulating sheet material using the plowing-aid raw material.
The present invention is based on the finding that when a specific aramid synthetic paper produced through calendering is hydrolyzed, a recyclable raw material for papermaking is obtained with excellent properties.
That is, the present invention provides a method for producing a raw material for papermaking, characterized in that the aramid synthetic paper, which is formed from a mixture of fibrids and / or short fibers formed from an aromatic polyamide and is calendered, is hydrolyzed do.
The present invention also provides a raw material for papermaking produced by the above production method.
The present invention also provides a heat-resistant electrically insulating sheet material comprising the papermaking raw material.
(Aramid)
In the present invention, aramid means a linear polymeric compound (aromatic polyamide) in which at least 60% of amide bonds are directly bonded to aromatic rings. Examples of such aramid include poly (p-phenylene) isophthalamide and copolymers thereof, polyparaphenylene terephthalamide and its copolymers, poly (paraphenylene) -copoly (3,4-diphenyl ether) terephthalate Amides and the like. These aramids are industrially produced by conventional interfacial polymerization and solution polymerization methods using, for example, isophthalic acid chloride and metaphenylenediamine, and are commercially available, but are not limited thereto. Of these aramids, poly (metaphenylene isophthalamide) is preferably used because it has good molding processability, heat adhesion, flame retardancy and heat resistance.
(Aramid Fibreid)
In the present invention, the aramid fibrids are aramid particles in the form of a film having superfine nature and are also called aramid pulp (see Japanese Patent Publication (Kokoku) No. 35-11851 and Japanese Patent Publication (Kokoku) No. 37-5732).
It is widely known that aramid fleece is used as grass padding material by performing disintegration and beating treatment in the same manner as ordinary wood pulp and can carry out so-called padding treatment for the purpose of maintaining quality suitable for grass padding. This defoaming treatment can be carried out by a paper refiner, a beater, or a papermaking material processing machine which causes other mechanical cutting action. In this operation, the change in the shape of the fibre lid can be monitored by the Yeosu test method (Freesens) specified in Japanese Industrial Standard P8121. After being subjected to beating treatment in the present invention, a freeness of aramid Five lead is preferably in the range of 10cm 3 to about 300cm 3 (Canadian Freeness (canadian freeness)). In a fused lead having a Young's modulus greater than this range, there is a possibility that the strength of the multi-phase electrically insulating sheet material formed therefrom may be lowered. On the other hand, if the freeness of less than 10 cm < 3 > is tried to be obtained, the utilization efficiency of the mechanical power to be input becomes small and the throughput per unit time is often decreased. In addition, since fining of the fibril proceeds too much, It is easy to cause. Thus, even if the degree of filtration is smaller than 10 cm 3 , a remarkable advantage is not obtained.
(Aramid staple fibers)
The aramid staple fibers are obtained by cutting aramid fibers. Examples of such aramid staple fibers include Teijin Conex (registered trademark) of Teijin Co., Ltd., Nomex (registered trademark of DuPont) ) "And the like, but the present invention is not limited thereto.
The length of the aramid staple fiber can be selected generally within a range of 1 mm or more and less than 50 mm, preferably 2 to 10 mm. When the length of the short fibers is smaller than 1 mm, the mechanical properties of the sheet material are lowered. On the other hand, when the length of the short fibers is 50 mm or more, "entanglement" and "binding" are likely to occur in the production of aramid paper by the wet method, .
(Aramid paper)
In the present invention, the aramid yarn is a sheet-like article mainly composed of the above-mentioned aramid fiber lid and aramid staple fibers, and has a thickness generally in the range of 20 탆 to 1000 탆. In addition, the aramid paper generally has a basis weight in the range of 10 g / m 2 to 1000 g / m 2 .
The aramid paper is generally produced by a method of mixing the above-mentioned aramid fiber lid and aramid staple fiber followed by sheeting. Specifically, for example, there are a method of dry-blending the above aramid fibril and aramid staple fibers and then forming a sheet using an air flow, a method of dispersing and mixing aramid fiber lid and aramid staple fibers in a liquid medium, A method of discharging a liquid onto a support, for example, a net or a belt to form a sheet, drying the liquid, and the like can be applied. Among them, the so-called wet grass method in which water is used as a medium is preferably selected. Here, the mixing ratio of the aramid fibril and the aramid staple fibers may be arbitrarily selected, but the ratio (mass ratio) of the aramid fibril / aramid staple fibers is preferably 1/9 to 9/1, more preferably 2/8 To 8/2.
In the wet laid paper method, a method in which an aqueous slurry of a single or a mixture containing at least aramid fibrids and aramid staple fibers is fed and dispersed in a paper making machine and then is wound up as a sheet by dewatering, dewatering and drying . Examples of the paper machine include a paper machine, a rescue machine, an inclined paper machine, and a combination paper machine. In the case of production in a combination paper machine, a composite sheet comprising a plurality of paper layers can be obtained by sheet-forming and combining slurries having different mixing ratios. Additives such as a dispersant improver, antifoaming agent, and soil strength enhancer are used at the time of papermaking if necessary.
(Calendar processing)
It has been known that aramid fabrics obtained as described above improve mechanical strength in addition to density, crystallinity, heat resistance and dimensional stability by thermo-compressing at high temperature and high pressure between a pair of rolls. For example, in the case of using a metal roll, the conditions of the hot pressure may be within a range of a temperature of 100 to 350 DEG C and a linear pressure of 50 to 400 kg / cm, but the present invention is not limited thereto. A plurality of aramid paper may be laminated on a thermo-pressed surface. The above-described hot-press working may be performed a plurality of times in an arbitrary order.
(Hydrolysis treatment)
In the present invention, the hydrolysis treatment refers to a treatment for selectively decomposing the aramid fibrids constituting the aramid paper by bringing the calendered aramid paper into contact with water, and the calendered aramid paper is immersed in the pressurized hot water or pressurized water vapor , It is preferable to hydrolyze the portion of the aramid fibril which is more easily hydrolyzed to bring the calendered aramid paper close to the shape of the short aramid fiber. As a condition at that time, the temperature for immersion is preferably in the range of 200 to 270 캜. When the temperature is within this range, the pressurized hot water sufficiently penetrates into the aramid paper, and the hydrolysis is favorably performed. In addition, it is possible to satisfactorily prevent softening of the calendered aramid paper and fusion with the aramid papers or the surrounding reaction vessels and the like, and to maintain a good yield.
Further, the pressure at the time of immersion is preferably a pressure higher than the saturated water vapor pressure. The time for immersion is not particularly limited as long as the pressurized hot water is sufficiently penetrated into the calendered aramid paper, but it is preferably in the range of 1 to 20 minutes. If it is shorter than 1 minute, the penetration is often insufficient, The hydrolysis does not proceed sufficiently. If the length of the aramid short fibers is longer than 20 minutes, the hydrolysis of the aramid short fibers may proceed excessively, and the shape of the short fibers as the papermaking raw material may not be fixed, and the yield may be lowered. Further, It is not realistic.
It is preferable that the calendered aramid paper subjected to the hydrolysis treatment is pulverized to a desired size in advance by a pulverizer or the like in consideration of operation such as subsequent sheet formation.
Generally, hydrolysis is promoted when an acid or an aqueous alkali solution is used in the hydrolysis treatment, but since the aramid staple fiber is excessively hydrolyzed, the shape of the staple fiber as the papermaking raw material can not be fixed, Which is undesirable.
(Heat of fusion)
In the present invention, the heat of fusion is measured by a thermal method such as DSC (Differential Scanning Calorimetry) or DTA (Differential Thermal Analysis). In general, the polymer exhibits a wide range of melting behavior, reflecting the fact that it contains a non-single molecular weight component and the difference in degree of crystallization. In the present invention, the area of the portion at the endothermic peak by DSC analysis is defined as the heat of fusion.
The heat of fusion per unit solid fraction after the hydrolysis treatment of the calendered aramid paper is considered to indicate the amount of the crystal, and the increase after the hydrolysis treatment means that the amount of crystal increases, that is, the calamined aramid paper has a low degree of crystallinity It is considered that the fibrids are decomposed by the hydrolysis treatment and the amount of the aramid staple fibers having a high degree of crystallinity relatively increases to show that the shape is close to the fibers.
An increase in the amount of heat of fusion per unit solid per minute is preferably 1.5 cal / g or more because entanglement as a short fiber tends to easily occur and strength of the heat-resistant electric insulating sheet material is improved. In addition, thickness irregularity of the heat resistant electrically insulating sheet material is also reduced. Therefore, in the present invention, it is preferable that the hydrolysis treatment is performed so that the heat of fusion after the hydrolysis treatment is higher than the heat of fusion of the aramid synthetic paper before the hydrolysis treatment, and it is easy to cause entanglement as a short fiber, The strength of the sheet material is improved. In addition, thickness irregularity of the heat resistant electrically insulating sheet material is also reduced.
(Heat-resistant electric insulation sheet material)
The heat-resistant electrically insulating sheet material of the present invention is a sheet material containing the papermaking raw material and has a thickness generally in the range of 20 to 5 mm. The heat-resistant electrically insulating sheet material generally has a basis weight in the range of 10 g / m 2 to 5000 g / m 2 , preferably 10 g / m 2 to 200 g / m 2 .
The content of the plowing raw material in the heat resistant electrical insulating sheet material is not particularly limited as long as it achieves the desired electrical insulating property, but is preferably from 5 to 80% by mass in order to maintain the process strength during production of the heat resistant electrical insulating sheet material , It is preferably 15 to 80 mass% in order to obtain sufficient electrical insulation, and particularly preferably 30 to 80 mass% in order to further develop sufficient strength.
The heat-resistant electrical insulating sheet material is generally produced by mixing the above-described papermaking raw material with an aramid fiber lid and then sheeting.
Specifically, first, the papermaking raw material is pulverized. As the pulverization method, a pulverization method by a dry method, a wet method, or both means is preferable. The dry method is a method of using a shredder, a crusher, a kneader or the like to decompose the papermaking raw material into fine particles without substantially containing moisture. The wet method is a method of reducing the particle size by applying an impact to a papermaking material in an aqueous medium. Examples of equipment for efficiently performing such wet grinding include, but are not limited to, a high-speed grinder, refiner, and bitter.
In the present invention, it is preferable that the calendered aramid paper is pulverized by the dry method in advance, then hydrolyzed, and further pulverized by the wet method. Further, a method of pulverizing by the wet method and a method of pulverizing by the wet method while mixing with the aramid fibril are preferably used. By mixing with the aramid fibrids, the mixed solution is easily homogenized, homogeneous fine particles can be easily produced, and at the same time, the wet treatment can also eliminate the defoaming treatment in the single aramid fibril aggregate, which is required for sheet production.
In the production of the sheet, for example, a method of dry-blending the papermaking raw material and the aramid fibrillate followed by forming a sheet using an air stream, a method of dispersing and mixing the papermaking raw material and the aramid fibril in a liquid medium, A method in which a liquid is removed and dried, or the like can be applied. However, among these methods, a so-called wet grass method in which water is used as a medium is preferably selected.
In the wet laid paper method, a method in which at least an aqueous slurry of a single or a mixture containing a papermaking raw material and an aramid fibril is fed and dispersed in a paper making machine, followed by dewatering, embedding, and drying. Examples of the paper machine include a paper machine, a rescue machine, an inclined paper machine, and a combination paper machine. In the case of production in a combination paper machine, a composite sheet comprising a plurality of paper layers can be obtained by sheet-forming and combining slurries having different mixing ratios. Additives such as a dispersant improver, antifoaming agent, and soil strength enhancer are used at the time of papermaking if necessary.
In addition to these, other fibrous components (such as aramid fibers, polyphenylene sulfide fibers, polyether ether ketone fibers, cellulose fibers, PVA fibers, polyester fibers, arylate fibers, liquid crystal polyester fibers, polyethylene naphthalate Inorganic fiber glass fibers such as organic fibers such as fibers, glass fibers, rockwool, asbestos, and boron fibers) can be added.
In the heat-resistant electrical insulating sheet material of the present invention, since the aramid fibril has excellent properties as a binder, fine particles and other added components can be efficiently replenished. In the heat-resistant electrical insulating sheet material of the present invention, Not only becomes good, but also it is possible to reduce the through hole by superimposing in layers in the sheet, and the electrical insulation is improved.
The heat-resistant electrically insulating sheet material thus obtained can be thermally pressed at a high temperature and a high pressure between a pair of flat plates or between metal rolls to improve density and mechanical strength. As for the conditions of the hot pressure, for example, in the case of using a metal roll, the temperature may be 100 to 350 DEG C and the linear pressure may be 50 to 400 kg / cm, but the present invention is not limited thereto. It is also possible to perform simply pressing at room temperature without applying a heating operation. It is also possible to laminate a plurality of heat-resistant electrically insulating sheet materials in a thermo-pressing manner. The above-described hot-press working may be performed a plurality of times in an arbitrary order.
Hereinafter, the present invention will be described by way of examples. These embodiments are for illustrating the contents of the present invention by way of example, and are not intended to limit the scope of the present invention.
[Example]
(How to measure)
(1) Measurement of heat of fusion
DSC analysis at a heating rate of 10 DEG C / min in a nitrogen atmosphere.
(2) Length-weighted average fiber length
The length-weighted average fiber length was measured for about 4000 microparticles using a Fiber Quality Analyzer manufactured by Op Test Equipment.
(3) Measurement of basis weight and thickness
JIS C2300-2.
For the thickness unevenness, the thickness of the continuous 40 points was measured, and the standard deviation thereof was determined as the thickness unevenness.
(4) Calculation of density
The basis weight divided by the thickness was calculated.
(5) Measurement of tensile strength
Tensilon tensile tester was carried out at a width of 15 mm, a chuck interval of 50 mm and a tensile speed of 50 mm / min.
(6) Breakdown voltage
A direct pressure method by alternating current was performed at an electrode diameter of 51 mm in accordance with ASTM D149.
(Raw material composition 1)
A fibrid of poly (meta-phenylene isophthalamide) was prepared by using a pulp particle production apparatus (wet type precipitator) composed of a combination of a stator and a rotor described in Japanese Patent Laid-Open Publication No. 52-15621. This was treated with a digestion and digestion system and the length-weighted average fiber length was adjusted to 0.9 mm (the freeness of the aramid fleece: 100 ml (Yeastu, Canada)).
On the other hand, meta-aramid fibers (NOMEX (registered trademark), mono-filament fineness 2 denier) manufactured by DuPont were cut to a length of 6 mm (hereinafter referred to as "aramid staple fibers").
(Preparation of calendered aramid paper)
The prepared aramid fibril and aramid short fibers were each dispersed in water to prepare a slurry. These slurries were mixed so that the fibrid and aramid staple fibers had a blend ratio (ratio by mass) of 1/1, and a sheet product was produced at the early stage of a tappi-type machine (a machine tool having a cross section of 625 cm 2). Subsequently, the resultant was subjected to a calender treatment with a metal calender roll at a temperature of 330 캜 under a linear pressure of 300 kg / cm to obtain calendered aramid paper.
(Raw material composition 2)
The calendered aramid paper was pulverized by a dry mill and passed through a sieve having a diameter of 3 mm (hereinafter referred to as? 3 aramid paper).
The 陸 3 aramid paper was mixed with water in an autoclave and hydrolyzed under the conditions shown in Table 1 to prepare a mixed slurry with water as a papermaking raw material. The slurry was treated with a stirrer and a disintegrator to adjust the length-weighted average fiber length to the size shown in Table 1 (Examples 1 to 3).
Further, the above-mentioned Φ3 aramid paper and water were mixed and hydrolyzed under the conditions shown in Table 1 to prepare a papermaking raw material, and a mixed slurry with water was prepared. The slurry was treated with a stirrer and a dissolver to adjust the length-weighted average fiber length to the size shown in Table 1 (Example 4).
(Examples 1 to 4, Control Example)
(Production of Heat-Resistant Electrical Insulating Sheet Material)
The prepared Φ3 aramid paper, the raw material for papermaking produced, and the prepared aramid fibrillate were each dispersed in water to prepare a slurry. These slurries were mixed so as to have a blending ratio (mass ratio) shown in Table 1, and sheet products were produced at the initial stage of the tapping water (sectional area 625 cm 2). Subsequently, this was subjected to a pressure treatment at a temperature of 330 DEG C and a linear pressure of 300 kg / cm by a calender roll made of metal to obtain a heat-resistant electrically insulating sheet material. The main characteristic values of the heat-resistant electrically insulating sheet material thus obtained are shown in Table 1.
From the results shown in Table 1, it can be seen that the heat-resistant electrically insulating sheet material of the present invention (Examples 1 and 2) has a sufficiently high breakdown voltage, a high strength and a small thickness irregularity, And therefore, it is found that this is useful as a heat resistant electrically insulating sheet material. On the contrary, the papermaking raw materials of Examples 3 and 4, which are the present invention, have a small difference from the control example of the heat of fusion, and the progress of hydrolysis is insufficient. Further, since the heat-resistant electrically insulating sheet material has a large thickness variation, it is also understood that its use as a heat-resistant electrically insulating sheet material is limited.
Claims (4)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011178823A JP5665690B2 (en) | 2011-08-18 | 2011-08-18 | Papermaking raw material manufacturing method, obtained papermaking raw material, and heat-resistant electrical insulating sheet material using the raw material |
| JPJP-P-2011-178823 | 2011-08-18 | ||
| PCT/JP2012/070732 WO2013024862A1 (en) | 2011-08-18 | 2012-08-15 | Method for producing papermaking feedstock, papermaking feedstock obtained thereby, and heat-resistant electrical insulation sheet material using the feedstock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20140053258A true KR20140053258A (en) | 2014-05-07 |
| KR101899188B1 KR101899188B1 (en) | 2018-09-14 |
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ID=47715179
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020147005495A KR101899188B1 (en) | 2011-08-18 | 2012-08-15 | Method for producing papermaking feedstock, papermaking feedstock obtained thereby, and heat-resistant electrical insulation sheet material using the feedstock |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5665690B2 (en) |
| KR (1) | KR101899188B1 (en) |
| CN (1) | CN103732825B (en) |
| TW (1) | TWI576485B (en) |
| WO (1) | WO2013024862A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6065315B2 (en) * | 2013-01-09 | 2017-01-25 | デュポン帝人アドバンスドペーパー株式会社 | Papermaking raw material manufacturing method, obtained papermaking raw material, and heat-resistant electrical insulating sheet material using the raw material |
| JP6217894B2 (en) * | 2013-02-08 | 2017-10-25 | デュポン帝人アドバンスドペーパー株式会社 | Colored aramid paper and method for producing the same |
| CN105887548A (en) * | 2014-11-15 | 2016-08-24 | 玖龙浆纸（乐山）有限公司 | One-step forming process method for heat-resistant paper |
| JP6405583B2 (en) * | 2014-12-26 | 2018-10-17 | 特種東海製紙株式会社 | Insulating paper |
| JP7373430B2 (en) * | 2020-02-21 | 2023-11-02 | デュポン帝人アドバンスドペーパー株式会社 | Manufacturing method of recycled aramid paper |
| JP2021130892A (en) * | 2020-02-21 | 2021-09-09 | デュポン帝人アドバンスドペーパー株式会社 | Method for producing paper pulp and method for producing regenerated aramid paper |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04228696A (en) | 1990-06-14 | 1992-08-18 | E I Du Pont De Nemours & Co | Aramide paper containing aramide paper pulp |
| JPH05272091A (en) * | 1992-03-18 | 1993-10-19 | New Oji Paper Co Ltd | Production of heat-insulating paper |
| JPH07243189A (en) | 1994-03-01 | 1995-09-19 | Teijin Ltd | Production of porous formed material of aramid |
| JP2003290676A (en) | 2002-03-29 | 2003-10-14 | Mitsubishi Paper Mills Ltd | Crushing method for laminated board, recycling method for crushed matter and heat-resistant electric insulating paper |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2766150B2 (en) * | 1993-01-14 | 1998-06-18 | 帝人株式会社 | Wholly aromatic polyamide structural material |
| JPH0757579A (en) * | 1993-08-18 | 1995-03-03 | New Oji Paper Co Ltd | Manufacture of heat-resistant insulating sheet |
| CN1710196A (en) * | 2005-06-20 | 2005-12-21 | 华南理工大学 | Full-para-polyfiber amide paper, and its preparing method and use |
-
2011
- 2011-08-18 JP JP2011178823A patent/JP5665690B2/en active Active
-
2012
- 2012-08-15 CN CN201280040218.9A patent/CN103732825B/en not_active Expired - Fee Related
- 2012-08-15 KR KR1020147005495A patent/KR101899188B1/en active IP Right Grant
- 2012-08-15 WO PCT/JP2012/070732 patent/WO2013024862A1/en active Application Filing
- 2012-08-17 TW TW101129892A patent/TWI576485B/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04228696A (en) | 1990-06-14 | 1992-08-18 | E I Du Pont De Nemours & Co | Aramide paper containing aramide paper pulp |
| JPH05272091A (en) * | 1992-03-18 | 1993-10-19 | New Oji Paper Co Ltd | Production of heat-insulating paper |
| JPH07243189A (en) | 1994-03-01 | 1995-09-19 | Teijin Ltd | Production of porous formed material of aramid |
| JP2003290676A (en) | 2002-03-29 | 2003-10-14 | Mitsubishi Paper Mills Ltd | Crushing method for laminated board, recycling method for crushed matter and heat-resistant electric insulating paper |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201313987A (en) | 2013-04-01 |
| CN103732825A (en) | 2014-04-16 |
| WO2013024862A1 (en) | 2013-02-21 |
| JP2013040421A (en) | 2013-02-28 |
| TWI576485B (en) | 2017-04-01 |
| CN103732825B (en) | 2016-06-01 |
| JP5665690B2 (en) | 2015-02-04 |
| KR101899188B1 (en) | 2018-09-14 |
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