CN116516718A - Aramid paper and preparation method thereof - Google Patents
Aramid paper and preparation method thereof Download PDFInfo
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- CN116516718A CN116516718A CN202310418992.9A CN202310418992A CN116516718A CN 116516718 A CN116516718 A CN 116516718A CN 202310418992 A CN202310418992 A CN 202310418992A CN 116516718 A CN116516718 A CN 116516718A
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- aramid
- aramid paper
- paper
- fibrids
- mixture
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- 239000004760 aramid Substances 0.000 title claims abstract description 119
- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 118
- 238000002360 preparation method Methods 0.000 title description 5
- 239000000835 fiber Substances 0.000 claims abstract description 55
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 11
- 230000009477 glass transition Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000007731 hot pressing Methods 0.000 claims description 5
- 230000035699 permeability Effects 0.000 description 7
- 239000011810 insulating material Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229920006231 aramid fiber Polymers 0.000 description 5
- 238000003490 calendering Methods 0.000 description 5
- 238000010292 electrical insulation Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000010009 beating Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229920000784 Nomex Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004763 nomex Substances 0.000 description 3
- 229920000889 poly(m-phenylene isophthalamide) Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- -1 polyethylene naphthalate Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- WRDNCFQZLUCIRH-UHFFFAOYSA-N 4-(7-azabicyclo[2.2.1]hepta-1,3,5-triene-7-carbonyl)benzamide Chemical compound C1=CC(C(=O)N)=CC=C1C(=O)N1C2=CC=C1C=C2 WRDNCFQZLUCIRH-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 238000012695 Interfacial polymerization Methods 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- FDQSRULYDNDXQB-UHFFFAOYSA-N benzene-1,3-dicarbonyl chloride Chemical compound ClC(=O)C1=CC=CC(C(Cl)=O)=C1 FDQSRULYDNDXQB-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 239000012772 electrical insulation material Substances 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- QZUPTXGVPYNUIT-UHFFFAOYSA-N isophthalamide Chemical compound NC(=O)C1=CC=CC(C(N)=O)=C1 QZUPTXGVPYNUIT-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 230000004660 morphological change Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920003366 poly(p-phenylene terephthalamide) Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/004—Drying webs by contact with heated surfaces or materials
-
- 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
Abstract
An aramid paper formed from a mixture of fibrids and short fibers formed from an aramid, the aramid paper having fibrid content and thickness satisfying the following inequalities (1) and (2): the FB is more than or equal to 40 and less than or equal to 90 (1); [ thickness ]/([ fiber diameter of short fiber ]. Times.2). Ltoreq.1.25 (2); wherein [ FB ] is the content (wt%) of fibrids in the aramid paper.
Description
The present application is a divisional application of the invention patent application entitled "aramid paper and method for producing the same", of application number 201680031183.0 (PCT/JP 2016/064567), 5-17 of application date 2016.
Technical Field
The present invention relates to an electrical insulating material having high heat resistance. More particularly, the present invention relates to a thin and strong aramid paper.
Background
Papers have been developed that are made from high performance materials that can impart improved strength and/or thermal stability to the paper. For example, aramid paper is a synthetic paper made of aramid, and is used as an electrical insulation material and a base material for an aircraft honeycomb structure due to its excellent heat resistance, flame resistance, electrical insulation, toughness, and flexibility. Among these materials, paper containing Nomex (registered trademark) fibers of DuPont (usa) is produced by mixing poly (m-phenylene isophthalamide) short fibers and fibrids in water, and then making a pulp sheet obtained by mixing, followed by calendar processing. It is known that the paper has excellent electrical insulation properties while having high strength and high toughness even at high temperatures.
In recent years, since devices requiring an insulating material such as a transformer and a motor are miniaturized and light-weighted, a thin insulating material having high heat resistance is further demanded.
Disclosure of Invention
The purpose of the present invention is to provide a thin electrical insulating sheet having high heat resistance.
The present invention also aims to provide a method for producing the above-mentioned electrical insulating sheet.
In view of the above, the present inventors have conducted intensive studies to develop a highly heat-resistant and thin insulating material that is suitable for downsizing and weight saving of transformers, motors, and the like, and as a result, have achieved the present invention.
That is, in the first embodiment, the present invention provides an aramid paper formed of a mixture of fibrids (fibrids) and short fibers formed of an aramid, the aramid paper having a fibrid content and a thickness satisfying the following inequalities (1) and (2):
40≤[FB]≤90 (1)
[ thickness ]/([ fiber diameter of short fiber ]. Times.2). Ltoreq.1.25 (2)
Wherein [ FB ] is the content (wt%) of fibrids in the aramid paper.
In a second embodiment, the present invention provides the method for producing an aramid paper according to the first embodiment, comprising sandwiching an aramid paper formed of a mixture of fibrids and short fibers formed of an aromatic polyamide between at least one pair of heating elements, and performing hot press processing, wherein the shrinkage rate of the aramid paper after hot press processing using the heating elements is 3% or less.
In addition, in a third embodiment, the present invention provides the method for producing an aramid paper according to the first embodiment, comprising: sandwiching an aramid paper formed of the mixture between at least one pair of heating elements, applying 1000kg/cm 2 At the same time of the above pressure, the heat Q (J/m) represented by the following formula (3) is supplied from the heat generating element 2 ) The mixture is a mixture of fibrids and short fibers formed from aromatic polyamide,
Q≥[BW]×c×(Tg-t) (3)
in [ BW ]]Is the basis weight (g/m) of the resin sheet 2 ) C is the specific heat (J/g/K) of the aramid paper, tg is the glass transition temperature (DEG C) of the aramid paper, t is the temperature (DEG C) of the aramid paper before being sandwiched by the heating element, and the surface temperature of the heating element is Tg or less.
The present invention will be described in detail below.
Detailed Description
(aramid fiber)
In the present invention, aramid means a linear polymer compound (aromatic polyamide) in which 60% or more of amide bonds are directly bonded to an aromatic ring. Examples of the aramid fibers include poly (m-phenylene isophthalamide) and its copolymer, poly (p-phenylene terephthalamide) and its copolymer, and copolymerized (p-phenylene terephthalamide.3, 4' -diphenyl ether). These aramid fibers can be industrially produced by a conventionally known interfacial polymerization method, a solution polymerization method, or the like using isophthaloyl dichloride and isophthalamide, for example, but are not limited thereto. Among these aramids, poly (m-phenylene isophthalamide) is preferably used because it has good molding processability, heat adhesiveness, flame retardancy, heat resistance and other properties.
(aramid fibrid)
In the present invention, the aramid fibrids are film-like aramid particles having papermaking properties, and are also called aramid pulp (refer to Japanese patent publication No. 35-11851, japanese patent publication No. 37-5732, etc.).
As is well known, aramid fibrids are used as paper stock by subjecting them to a dissociation and beating treatment similar to those of ordinary wood pulp, and so-called beating treatment may be performed in order to maintain the quality suitable for paper making. The beating treatment may be carried out by a disc refiner, beater, other paper stock treatment equipment that produces a mechanical cutting action. In this operation, the morphological change of fibrids can be monitored by the freeness test method (freeness) specified in japanese industrial specification P8121. In the present invention, the freeness of the aramid fibrids after beating treatment is preferably 10 to 300cm 3 (Canadian Standard freeness). If the fiber is a fibrid having a freeness larger than the above range, the strength of the heat-resistant electric insulating sheet formed from the fiber may be lowered. On the other hand, if it is desired to obtain a ratio of 10cm 3 The small freeness tends to reduce the utilization efficiency of the mechanical power to be input, the throughput per unit time tends to be small, and the miniaturization of the fibrids tends to progress excessively, so that the so-called binder function tends to be lowered. Therefore, even if a specific 10cm is desired 3 Small freeness also does not confirm significant advantages.
In the aramid paper of the present invention, since aramid fibrids have excellent properties as a binder, fine particles and other additives can be effectively supplemented, and in the production of the aramid paper of the present invention, the raw material yield is improved, and the aramid fibrids are layered in a sheet, so that through holes can be reduced, and electrical insulation can be improved.
(aramid short fiber)
In the present invention, the aramid short fiber is obtained by cutting an aramid fiber as a material, and examples of such a fiber include, but are not limited to, fibers obtainable under trade names such as "teijnconex (registered trademark)" of DuPont corporation and "Nomex (registered trademark)".
The length of the aramid staple fiber can be generally selected from the range of 1mm or more and less than 50mm, preferably 2 to 10 mm. If the length of the short fibers is less than 1mm, the mechanical properties of the sheet are reduced, while short fibers of 50mm or more tend to cause "entanglement", "binding" or the like when the aramid paper is produced by a wet method, and defects are likely to be caused.
The fiber diameter of the aramid short fiber can be selected from the range of preferably 0.1 to 25 μm, more preferably 1 to 20 μm.
(aramid paper)
In the present invention, the aramid paper is a sheet consisting essentially of the aramid fibrids and the aramid staple fibers, and has a fibrid content and thickness satisfying the following inequalities (1) and (2):
40≤[FB]≤90 (1)
[ thickness ]/([ fiber diameter of short fiber ]. Times.2). Ltoreq.1.25 (2)
Wherein [ FB ] is the content (wt%) of fibrids in the aramid paper. When the content of fibrids is less than 40% by weight, the aramid paper becomes more porous, which tends to interfere with the electrical insulation. If the content of the short fibers is larger than 90% by weight, the shrinkage of the aramid paper after the heat press processing by sandwiching the aramid paper between at least one pair of heating elements described below exceeds 3%, and the thickness of the aramid paper is increased by shrinkage, so that the aramid paper is difficult to have a thickness in the range of the formula (2).
The aramid paper is generally produced by a method of mixing the aramid fibrids and the aramid staple fibers and then sheeting the mixture. Specifically, for example, the following method can be applied: a method of forming a sheet by air flow after dry-mixing the aramid fibrid and the aramid staple fiber; dispersing and mixing aramid fibrid and aramid staple fiber in a liquid medium, and then discharging the mixture onto a liquid-permeable support (such as a net or a belt) to form a sheet, removing the liquid, and drying the sheet; among them, the so-called wet papermaking method using water as a medium is preferably selected.
In the wet papermaking method, a general method is: after the aqueous pulp containing at least a single or a mixture of aramid fibrids and aramid staple fibers is fed to a paper machine to be dispersed, the pulp is dewatered, squeezed and dried to be wound in the form of a sheet. As the paper machine, a fourdrinier machine, a cylinder machine, an inclined machine, a combined machine combining them, and the like are used. In the case of producing with a combined paper machine, a composite sheet composed of a plurality of paper layers can be obtained by sheet-forming and combining pulp having different blending ratios. Additives such as a dispersibility improver, a defoaming agent, and a paper strength enhancer are used as needed in papermaking.
In addition, other fibrous components (for example, organic fibers such as polyphenylene sulfide fibers, polyether ether ketone fibers, cellulose fibers, PVA fibers, polyester fibers, polyarylate fibers (a) ), organic fibers such as liquid crystal polyester fibers and polyethylene naphthalate fibers, and inorganic fiber glass fibers such as glass fibers, rock wool, asbestos and boron fibers) may be added.
The aramid paper generally has a weight of 5 to 1000g/m 2 Preferably 15 to 200g/m 2 Basis weight in the range of (2).
The tensile strength of the aramid paper is preferably in the range of 0.5kgf/15mm or more, more preferably 1kgf/15mm or more. The air permeability of the aramid paper is preferably 3000 seconds or more, more preferably 4000 seconds or more.
(Hot pressing)
It is known that the aramid paper obtained as described above is hot-pressed at a high Wen Gao between a pair of heating elements, whereby the density, crystallinity, heat resistance, dimensional stability and mechanical strength are improved. Regarding the condition of hot pressing, it is preferable that the shrinkage rate of the aramid paper after hot pressing by sandwiching between the heating elements is 3% or less. If the shrinkage exceeds 3%, the thickness increases due to shrinkage, and it becomes difficult to have a thickness in the range of the formula (2). The shrinkage is more preferably 2% or less, and still more preferably 1.5% or less.
Further, it is preferable that 100 is applied by sandwiching the aramid paper between at least one pair of heating elements0kg/cm 2 At the same time of the above pressure, heat Q (J/m) represented by the following formula (3) is supplied from the heating element to the aramid paper per unit area 2 )：
Q≥[BW]×c×(Tg-t) (3)
(in the formula, [ BW ]]Is the basis weight (g/m) 2 ) C is the specific heat (J/g/K) of the aramid paper, tg is the glass transition temperature (DEG C) of the aramid paper, t is the temperature (DEG C) of the aramid paper before being sandwiched by a heating element, and the surface temperature of the heating element is Tg or less, the shrinkage rate can be controlled within 3%, and the short fiber itself is deformed by sufficient hot pressing, thereby producing a thinner sheet.
As the hot press, for example, the aramid paper has a basis weight of 20g/m 2 When a metal roll is used as a heating element, when the surface temperature is 100 to 275 ℃ and the outer circumference of the metal roll in contact with the aramid paper is 1mm, for example, when the glass transition temperature is 275 ℃ and the temperature before being sandwiched by the metal rolls is 20 ℃, the heat supplied from the metal roll having a line pressure of 100kg/cm or more to the aramid paper is 9640J/m 2 The above is not limited thereto. The hot press process may be performed a plurality of times in any order.
(glass transition temperature)
In the present invention, the glass transition temperature is: heating the test piece from room temperature at a rate of 3 ℃/min, measuring the heating value by using a differential scanning calorimeter, leading 2 extension lines on the heat absorption curve, and obtaining a value from the intersection point of a 1/2 straight line between the extension lines and the heat absorption curve; the glass transition temperature of the aramid paper used in the examples was 275 ℃.
(specific heat)
In the present invention, as for the specific heat, the test piece was warmed up from room temperature at a rate of 3 ℃/min, and the specific heat was measured with a differential scanning calorimeter. The specific heat of the aramid paper used in the examples was 1.89J/g/K.
The present invention will be described more specifically below with reference to examples. It should be noted that these embodiments are merely examples, and are not intended to limit the present invention in any way.
Example (measurement method)
(1) Shrinkage rate
The width of the aramid paper before and after the calendering process was measured and calculated by the following formula.
[ width of aramid paper after calendering ]/[ width of aramid paper before calendering ] ×100%
(2) Determination of basis weight, thickness
According to JIS C2300-2.
The thickness of 40 consecutive points was measured as the thickness deviation, and the standard deviation was used as the thickness deviation.
(3) Calculation of Density
Calculated as basis weight/thickness.
(4) Determination of tensile Strength
The drawing was performed using a Tensilon tensile tester at a width of 15mm, a chuck spacing of 50mm, and a drawing speed of 50 mm/min.
(5) Air permeability
The air permeability measured by using a Wang Yan type air permeability meter (KG-2 manufactured by Asahi Seiko Co., ltd.) was converted into a Gurley type air permeability. For a series of sheets, the shorter the time, the more porous it is, and thus the electrical insulation can be said to be low.
(preparation of raw materials)
A pulp particle production apparatus (wet precipitator) comprising a combination of a stator and a rotor described in japanese patent application laid-open No. 52-15621 was used to produce a fibrid of polymetaphenylene isophthalamide. The fiber was treated with a disintegrator and a beater, and the length-weighted average fiber length was adjusted to 0.9mm (freeness of aramid fibrids: 100ml (Canadian freeness)). On the other hand, meta-aramid fiber (Nomex (registered trademark), manufactured by DuPont, with a denier per filament of 2 and a fiber diameter of 15 μm) was cut into a length of 6mm (hereinafter referred to as "aramid staple fiber").
Examples 1 to 4
(preparation of aramid paper)
The aramid fibrids and the aramid staple fibers prepared as described above were each dispersed in water to prepare pulp.These pulps were mixed so that the aramid fibrids and the aramid staple fibers were each blended at the ratio (weight ratio) shown in Table 1, and a TAPPI-type hand paper machine (625 cm in cross-sectional area) 2 ) Preparing a sheet. Next, this was adjusted on a metal calender roll so that the outer circumference of the roll in contact with the aramid paper was 1mm, and hot press processing was performed under each calendering condition shown in table 1 (the temperature of the aramid paper before being sandwiched by the heating elements was 20 ℃) to obtain the aramid paper. The main characteristic values of the aramid paper obtained as described above are shown in table 1.
TABLE 1
TABLE 1
According to the results of Table 1, since the shrinkage of the aramid paper of the present invention (examples 1 to 4) was controlled to 3% or less, the thickness satisfied the following formula (2)
The thickness/(fiber diameter of the short fiber) ×2). Ltoreq.1.25 (2), the more sufficiently becomes thinner, and the more sufficiently becomes the air permeability, the more the strength is also high, and the aramid raw material having high heat resistance per se is used, so that it is useful as an insulating material for transformers, motors, and the like.
Comparative examples 1 to 3
(preparation of aramid paper)
The aramid fibrids and the aramid staple fibers prepared as described above were each dispersed in water to prepare pulp. These pulps were mixed so that the aramid fibrids and the aramid staple fibers were each blended at the ratio (mass ratio) shown in Table 2, and a TAPPI-type hand paper machine (625 cm in cross-sectional area) 2 ) Preparing a sheet. Next, this was adjusted on a metal calender roll so that the outer circumference of the roll in contact with the aramid paper was 1mm, and hot press processing was performed under each calendering condition shown in table 2 (the temperature of the aramid paper before being sandwiched by the heating elements was 20 ℃) to obtain the aramid paper. The main characteristic values of the aramid paper obtained as described above are shown in table 2.
TABLE 2
TABLE 2
As is clear from Table 2, the aramid papers of comparative examples 1 to 3 have low air permeability. Further, since the strength of the aramid paper of comparative example 1 is small and the shrinkage of the aramid papers of comparative examples 2 and 3 is high, the thickness is increased, and it is considered that it is difficult to cope with miniaturization and weight saving of devices such as transformers and motors as insulating materials.
Claims (3)
1. An aramid paper formed from a mixture of fibrids and short fibers formed from an aramid, the aramid paper having fibrid content and thickness satisfying the following inequalities (1) and (2):
40≤[FB]≤90 (1)
[ thickness ]/([ fiber diameter of short fiber ]. Times.2). Ltoreq.1.25 (2)
Wherein [ FB ] is the content (wt%) of fibrids in the aramid paper.
2. The method for producing an aramid paper according to claim 1, comprising sandwiching an aramid paper formed of a mixture of fibrids and short fibers formed of an aromatic polyamide between at least one pair of heating elements and performing hot press processing,
and the shrinkage rate of the aramid paper after hot pressing by the heating element is 3% or less.
3. The method for preparing the aramid paper as claimed in claim 1, which comprises: sandwiching an aramid paper formed of the mixture between at least one pair of heating elements, applying 1000kg/cm 2 At the same time of the above pressure, the heat Q (J/m) represented by the following formula (3) is supplied from the heat generating element 2 ) The mixture is a mixture of fibrids and short fibers formed from aromatic polyamide,
Q≥ [BW]×c×(Tg-t) (3)
in [ BW ]]Is the basis weight (g/m) 2 ) C is the specific heat (J/g/K) of the aramid paper, tg is the glass transition temperature (DEG C) of the aramid paper, t is the temperature (DEG C) of the aramid paper before being sandwiched by the heating element, and the surface temperature of the heating element is Tg or less.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015108455A JP6649701B2 (en) | 2015-05-28 | 2015-05-28 | Aramid paper and method for producing the same |
| JP2015-108455 | 2015-05-28 | ||
| CN201680031183.0A CN107636226A (en) | 2015-05-28 | 2016-05-17 | Aramid paper and preparation method thereof |
| PCT/JP2016/064567 WO2016190163A1 (en) | 2015-05-28 | 2016-05-17 | Aramid paper sheet and method for producing same |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680031183.0A Division CN107636226A (en) | 2015-05-28 | 2016-05-17 | Aramid paper and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116516718A true CN116516718A (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310418992.9A Pending CN116516718A (en) | 2015-05-28 | 2016-05-17 | Aramid paper and preparation method thereof |
| CN201680031183.0A Pending CN107636226A (en) | 2015-05-28 | 2016-05-17 | Aramid paper and preparation method thereof |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680031183.0A Pending CN107636226A (en) | 2015-05-28 | 2016-05-17 | Aramid paper and preparation method thereof |
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| Country | Link |
|---|---|
| JP (1) | JP6649701B2 (en) |
| KR (1) | KR20180012743A (en) |
| CN (2) | CN116516718A (en) |
| TW (1) | TWI702326B (en) |
| WO (1) | WO2016190163A1 (en) |
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|---|---|---|---|---|
| DE102017003559A1 (en) * | 2017-04-12 | 2018-10-18 | Diehl Aviation Laupheim Gmbh | Paper and honeycomb made from it |
| JP7183073B2 (en) * | 2019-02-22 | 2022-12-05 | デュポン帝人アドバンスドペーパー株式会社 | Aramid paper manufacturing method |
| EP3946676A1 (en) * | 2019-04-05 | 2022-02-09 | Ahlstrom-Munksjö Oyj | Flue gas filtration media |
| CN115897292A (en) * | 2022-10-28 | 2023-04-04 | 株洲时代华先材料科技有限公司 | Aramid crepe paper and preparation method thereof |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4992141A (en) * | 1989-05-26 | 1991-02-12 | E. I. Du Pont De Nemours And Company | Thin, resin-saturable aromatic polyamide paper and process for making same |
| JP3782842B2 (en) * | 1995-11-13 | 2006-06-07 | 三島製紙株式会社 | Heat-resistant paper |
| US5910231A (en) * | 1997-07-22 | 1999-06-08 | E. I. Du Pont De Nemours And Company | Aramid papers of improved solvent resistance and dimensionally stable laminates made therefrom |
| KR100578777B1 (en) * | 2000-08-04 | 2006-05-12 | 데이진 가부시키가이샤 | Heat-resistant fibrous paper |
| CN100494565C (en) * | 2005-02-05 | 2009-06-03 | 浙江凯恩特种材料股份有限公司 | Aramid paper and its preparing method |
| JP2007308836A (en) * | 2006-05-19 | 2007-11-29 | Teijin Techno Products Ltd | Heat-resistant electrical insulating paper |
| CN101343845B (en) * | 2008-07-22 | 2010-09-08 | 成都龙邦新材料有限公司 | Aramid fiber honeycomb core base stock and preparation method thereof |
| JP2011233482A (en) * | 2010-04-30 | 2011-11-17 | Du pont teijin advanced paper co ltd | Thinned material for nonaqueous electric/electronic component |
| JP2011258462A (en) * | 2010-06-10 | 2011-12-22 | Du pont teijin advanced paper co ltd | Thinned material for nonaqueous electric and electronic component |
| JP5723199B2 (en) * | 2011-04-07 | 2015-05-27 | デュポン帝人アドバンスドペーパー株式会社 | Conductive aramid paper and manufacturing method thereof |
| EP3041988B1 (en) * | 2013-09-06 | 2017-07-19 | Teijin Aramid B.V. | Separator paper for electrochemical cells |
-
2015
- 2015-05-28 JP JP2015108455A patent/JP6649701B2/en active Active
-
2016
- 2016-05-17 CN CN202310418992.9A patent/CN116516718A/en active Pending
- 2016-05-17 KR KR1020177029459A patent/KR20180012743A/en not_active Application Discontinuation
- 2016-05-17 WO PCT/JP2016/064567 patent/WO2016190163A1/en active Application Filing
- 2016-05-17 CN CN201680031183.0A patent/CN107636226A/en active Pending
- 2016-05-18 TW TW105115312A patent/TWI702326B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2016223021A (en) | 2016-12-28 |
| JP6649701B2 (en) | 2020-02-19 |
| CN107636226A (en) | 2018-01-26 |
| KR20180012743A (en) | 2018-02-06 |
| TWI702326B (en) | 2020-08-21 |
| TW201704591A (en) | 2017-02-01 |
| WO2016190163A1 (en) | 2016-12-01 |
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