CN100485123C - Synthetic fiber paper containing basalt fiber and chemical fiber and its preparation method - Google Patents
Synthetic fiber paper containing basalt fiber and chemical fiber and its preparation method Download PDFInfo
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- CN100485123C CN100485123C CNB2006100635132A CN200610063513A CN100485123C CN 100485123 C CN100485123 C CN 100485123C CN B2006100635132 A CNB2006100635132 A CN B2006100635132A CN 200610063513 A CN200610063513 A CN 200610063513A CN 100485123 C CN100485123 C CN 100485123C
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- 239000000835 fiber Substances 0.000 title claims abstract description 92
- 229920002994 synthetic fiber Polymers 0.000 title claims description 34
- 229920002748 Basalt fiber Polymers 0.000 title claims description 27
- 238000002360 preparation method Methods 0.000 title claims description 15
- 239000000126 substance Substances 0.000 title description 4
- 239000012209 synthetic fiber Substances 0.000 title description 3
- 239000004734 Polyphenylene sulfide Substances 0.000 claims abstract description 32
- 229920000069 polyphenylene sulfide Polymers 0.000 claims abstract description 32
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 28
- 239000002002 slurry Substances 0.000 claims description 12
- 238000005098 hot rolling Methods 0.000 claims description 8
- 229920000784 Nomex Polymers 0.000 claims description 7
- 239000004763 nomex Substances 0.000 claims description 7
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 5
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 claims description 3
- 229940018564 m-phenylenediamine Drugs 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 239000002253 acid Substances 0.000 abstract 1
- 239000003513 alkali Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- 229920000049 Carbon (fiber) Polymers 0.000 description 4
- 239000004917 carbon fiber Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 241000208340 Araliaceae Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 206010016256 fatigue Diseases 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 210000001161 mammalian embryo Anatomy 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 on performance Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The invention belongs to the field of composing fiber paper. It relates to composing non-woven paper, especially relates to a kind of fiber paper made by wet method with basaltic fiber, aramid fiber and polyphenylene sulfide fiber. The composing fiber paper has much strongpoint including well mechanical property, good high-temperature resistance, acid resistance, alkali resistance, strength uvioresistant property, low hygroscopic, better environment bearing property, good insulativity, good high-temperature filterability, radio resistance and good wave-passing property. Therefore, the composing fiber paper is applicable for military engineering and civil fields including aerospace, military engineering, vehicle and ship building and architecture.
Description
Technical field
The invention belongs to the synthetic fibre paper field, relate to synthetic non-woven paper structure, particularly a kind of fibrous paper made from basalt fibre, aramid fiber and polyphenylene sulfide fibre wet method.
The invention still further relates to the preparation method of above-mentioned synthetic fibre paper.
Background technology
Along with the development of material science, the performance requirement of paper is improved day by day, and synthetic fibre paper is because of having intensity height, dimensionally stable than common plant fiber paper, being difficult for advantage such as aging, resistance to chemical attack and being paid close attention to widely.In the prior art, the synthetic fibre paper of manufacturing paper with pulp with the non-woven paper structure is known, disclosing a kind of in the Chinese patent as patent No. ZL99114635.2 is the synthetic fibre paper that raw material is made with the Nomex synthetic fiber, it is main fibre that this patent has been described with the Fanglun l414 fiber, makes the method that bondable fibers is made synthetic paper with polyester.In the method, because of the use of polyester, limited to the heat resistance of paper.Chinese patent CN1814912 also discloses the aramid fiber paper of being made up of the hot-forming mutual bonding of meta-aramid fiber, it is the synthetic fibre paper of raw material that Chinese patent CN1570271 discloses with the polyacrylonitrile-based carbon fibre, it is main fibre that this patent has been described with carbon fiber, aramid fiber, makes the method that bondable fibers is made synthetic paper with polyester or polyphenylene sulfide fibre.But because of the manufacturing cost of self intensity of carbon fiber and fiber and use polyester, limited to the development of paper in wider field.International Patent Application WO 2004025024 discloses the aramid fiber of being made up of aramid fiber and polyarylamide fibrid and has added the fibrous paper that polymeric binder constitutes.Chinese patent CN1287955 discloses a kind of basalt-pearlspar composite fiber paper in addition, and its major ingredient is basalt-pearlspar composite fiber and fibrous paper dry pulp, and auxiliary material is gum rosin, alum, talcum powder.Use string in the constituent because of this kind fibrous paper, make should in fibrous paper have shortcomings such as not anti-water, non-refractory, resistance to oxidation, corrosion-resistant, fatigability difference.
Summary of the invention
The object of the present invention is to provide a kind of is structural fibers with basalt fibre and aramid fiber, is a kind of synthetic fibre paper of bondable fibers with the polyphenylene sulfide fibre.
Another object of the present invention is to provide the preparation method of above-mentioned synthetic fibre paper.
Above-mentioned purpose is achieved through the following technical solutions, and a kind of synthetic fibre paper contains: structural fibers 10～90 weight portions and bondable fibers 10～90 weight portions.Preferably contain structural fibers 40～60 weight portions and bondable fibers 40～60 weight portions, wherein, structural fibers contains the aramid fiber of the basalt fibre and 15～95% (weight) of 5～85% (weight), the polyphenylene sulfide fibre of bondable fibers 40～60 weight portions.
Basalt fibre of the present invention, fibre diameter are controlled at 1～4 micron, and length is at 3～5 millimeters.
Aramid fiber of the present invention comprises the poly-p-phenylenediamine (PPD) fiber (Fanglun l414) of Nomex and pulp goods or Nomex poly m-phenylene diamine fiber (aramid fiber 1313) and fibrid goods thereof.The Fanglun l414 pulp be with above-mentioned Fanglun l414 long filament after prescinding, mechanical beating and grinding form.The preparation of aramid fiber fibrid is respectively phenyl-diformyl amine aqueous solution between certain viscosity poly-and precipitating agent to be delivered in the precipitation machine, under the high speed shear effect, mix, separate out the fiber of the tiny film strip of two dimension, at last through washing, after beating is refining, obtain the fibrid slurry.The fiber number of described Fanglun l414 fiber is that 1～2d, length are 0.5～10mm, and the fiber number of described aramid fiber 1313 fiber is that 1～2d, length are 0.5～10mm.
Bondable fibers of the present invention is a polyphenylene sulfide fibre, and polyphenylene sulfide fibre has higher mechanical strength, and the softening point of the polyphenylene sulfide fibre that the present invention uses is that 260 ℃, fusing point are that 280 ℃, fibre length are 1～6mm.
According to of the present invention, the preparation method of this synthetic fibre paper comprises steps such as batching slurrying, the shaping of manufacturing paper with pulp, dehydration, drying, high temperature hot rolling and side cut shaping.In batching slurrying step, earlier basalt fibre is discongested in the waterpower fluffer by 0.5～2% weight concentration, make a slurries A, then aramid fiber and part aramid fiber pulp and polyphenylene sulfide fibre are mixed and in the waterpower fluffer, discongest by 0.1～1.5% weight concentration, make another slurries B, at last two kinds of slurries are mixed in joining stock tank, thereby form the paper making pulp that can be added into the papermaking flow box.
Because basalt fibre, there are not enough adhesions between the aramid fiber, must increase the bond strength of paper by other adhesive, the present invention adopts polyphenylene sulfide fibre to make bondable fibers, because of polyphenylene sulfide fibre has higher mechanical strength, utilize the characteristic of polyphenylene sulfide fibre melted by heating, work as basalt fibre, the roll compacting the time of aramid fiber synthetic paper embryo near the polyphenylene sulfide fibre melting temperature, the basalt fibre that the polyphenylene sulfide fibre of softening fusion will not melt under pressure, aramid fiber is bonded together, reach the purpose of typing, and formed the intensity of synthetic paper.
In the preparation method of synthetic fibre paper of the present invention, because of the hydrophobicity of aramid fiber and polyphenylene sulfide fibre, extremely difficult dispersion the in water.In order to promote the dispersion of above-mentioned fiber in water, can in described paper-making pulping, add the anti flocculant of 1～10 weight portion.
In the preparation method of synthetic fibre paper of the present invention,, adopt the cylinder mould machine former with conventional paper technology.The described shaping of manufacturing paper with pulp can be adopted single garden net or many gardens net forming technology.
Page is controlled hot rolling linear pressure 100～200kg/cm through hot mill rolling subsequently, and hot-rolled temperature is about 280 ℃.Through the press polish shaping, finally form basalt, chemical fibre synthetic paper then.
Synthetic fibre paper of the present invention, adopt basalt fibre, on performance, basalt fibre is than other tec fibers such as carbon fiber, aramid fiber, ultra high molecular weight polyethylene fibers, advantage with a lot of uniquenesses, good as mechanical property, resistance to elevated temperatures is good, can continuous operation in-269～700 ℃ of scopes, and acid-fast alkali-proof, anti-ultraviolet property is strong, hygroscopicity is low, better environmental resistance is arranged, in addition, also have good insulation preformance, high temperature filtration is good, radioresistance, good advantages such as wave penetrate capability.Therefore, be to strengthen the composite that body can be made into various excellent performances with the basalt fibre, can be widely used in military project and civil areas such as Aero-Space, military project, car and boat manufacturing, engineering plastics, building.
It is more excellent on heat resistance that polyphenylene sulfide of the present invention is made the more above-mentioned polyester fiber of bondable fibers.
The present invention combines above-mentioned synthetic fiber advantage separately, has prepared a kind ofly with basalt fibre and aramid fiber, and three kinds of fibers of polyphenylene sulfide fibre all-in-one-piece synthetic fibre paper of manufacturing paper with pulp makes its combination property be better than existing carbon fiber paper and aramid fiber paper.At present, this synthetic fibre paper yet there are no report at home and abroad.
The specific embodiment
More than be to general description the of the present invention, will be further explained claim of the present invention by the specific embodiment below.Material source:
Basalt fibre: Jingpo Lake, Ningan City, Heilongjiang Province alkaline-resisting Black Warrior fiber Co., Ltd produces
The Fanglun l414 fiber: Japanese Supreme Being people company produces
The aramid fiber 1313 fiber: Guangdong newly can color gorgeous company produce
Polyphenylene sulfide fibre: Hua Tuo company in Sichuan produces
[embodiment 1]
Prepare present embodiment 1 synthetic fibre paper in following ratio:
Basalt fibre (2～4mm) 5 amounts part (to call " part " in the following text)
(5～6mm) 45 parts of Fanglun l414 fibers
(5～6mm) 50 parts of polyphenylene sulfide fibres
The basalt fibre of above-mentioned content is discongested in the waterpower fluffer by 1% weight concentration, make paper pulp A, above-mentioned content Fanglun l414 fiber (wherein containing 0～20% pulp) and polyphenylene sulfide fibre discongested in the waterpower fluffer by 0.5% weight concentration make paper pulp B, after then slurries A and slurries B being mixed, in slurry-stablizing case, add 5 parts of anti flocculants in dosing chamber.Regulate slurries online pressure head through slurry-stablizing case, slurries are evenly distributed on the paper making forming net (two gardens net) in head box, and page is through the hot-rolling mill single hot-roll forming subsequently, and control hot rolling linear pressure is 150kg/cm, in 270～280 ℃ of scopes of control hot-rolled temperature.Paper after the hot rolling makes the density of paper, the surface characteristic of paper, the deflection of paper reach gratifying effect through the further integer of calender.What obtain the results are shown in Table 1:
Table 1
[embodiment 2]
Prepare present embodiment 2 synthetic fibre papers by following weight portion:
(2～4mm) 5 parts of basalt fibres
(5～6mm) 45 parts of aramid fiber 1313 fibers
(5～6mm) 50 parts of polyphenylene sulfide fibres
Present embodiment substitutes the Fanglun l414 fiber with aramid fiber 1313 fiber (containing 0～20% fibrid), and the preparation method of synthetic fibre paper is identical with embodiment 1, and what obtain the results are shown in Table 2:
Table 2
[embodiment 3]
Prepare present embodiment 3 synthetic fibre papers by following weight portion:
(6～8mm) 25 parts of basalt fibres
(5～6mm) 25 parts of Fanglun l414 fibers
(5～6mm) 50 parts of polyphenylene sulfide fibres
Present embodiment 3 is under the situation that does not change 50 parts of consumptions of polyphenylene sulfide fibre, and basalt fibre weight is increased to 25 parts, and the Fanglun l414 fiber reduces to 25 parts, and all the other steps are undertaken by embodiment 1 identical preparation method, and the test result that obtains sees Table 3:
Table 3
[embodiment 4]
Prepare present embodiment 4 synthetic fibre papers by following weight portion:
(6～8mm) 40 parts of basalt fibres
(5～6mm) 10 parts of Fanglun l414 fibers
(5～6mm) 50 parts of polyphenylene sulfide fibres
At embodiment 3, the basalt fibre ratio is increased to 40 parts, the Fanglun l414 fiber reduces to 10 parts, and under the constant situation of 50 parts of consumptions of polyphenylene sulfide fibre, all the other steps are undertaken by embodiment 1 identical preparation method, and resulting test result sees Table 4:
Table 4
[embodiment 5]
Prepare present embodiment 5 synthetic fibre papers in following ratio:
(6～8mm) 5 parts of basalt fibres
(5～6mm) 35 parts of Fanglun l414 fibers
(5～6mm) 60 parts of polyphenylene sulfide fibres
Described embodiment adopts 60 parts polyphenylene sulfide fibre, and all the other steps and embodiment 1 identical preparation method carries out, and the test result that obtains sees Table 5:
Table 5
[embodiment 6]
Prepare present embodiment 6 synthetic fibre papers by following weight portion:
(6～8mm) 5 parts of basalt fibres
(5～6mm) 60 parts of Fanglun l414 fibers
(5～6mm) 35 parts of polyphenylene sulfide fibres
The difference of present embodiment is to select for use 35 parts of polyphenylene sulfide fibres.All the other steps are undertaken by embodiment 1 identical technology, and the test result that obtains sees Table 6:
Table 6
The invention is not restricted to above embodiment, can be according to the dependence of parameters such as ginseng mixing ratio, hot rolling technology with synthetic fibre paper physical mechanical strength index, change proportioning and parameter are made the product type and the specification that can satisfy user's specific (special) requirements; Those skilled in the art can also make various changes and distortion, under the prerequisite that does not break away from spirit of the present invention, all fall within the scope of the invention.
Claims (8)
1, a kind of synthetic fibre paper, contain:
Structural fibers 10～90 weight portions;
Bondable fibers 10～90 weight portions;
Wherein, described structural fibers contains the aramid fiber of the basalt fibre and 15～95% (weight) of 5～85% (weight), described aramid fiber is the poly-p-phenylenediamine (PPD) fiber of Nomex and pulp goods or Nomex poly m-phenylene diamine fiber and fibrid goods thereof, and described aramid fiber fiber number is that 1～2d, length are 0.5～10mm; Described bondable fibers is a polyphenylene sulfide fibre.
2, the described synthetic fibre paper of claim 1 is characterized in that described structural fibers is 40～60 weight portions.
3, the described synthetic fibre paper of claim 1 is characterized in that described bondable fibers is 40～60 weight portions.
4, the described synthetic fibre paper of claim 1 is characterized in that described basalt fibre diameter is 1～4 micron, and length is 3～5 millimeters.
5, the described synthetic fibre paper of claim 1, the softening point that it is characterized in that described polyphenylene sulfide fibre are that 260 ℃, fusing point are that 280 ℃, fibre length are 1～6mm.
6, the preparation method of the described synthetic fibre paper of claim 1 comprises the steps:
1) basalt fibre is discongested by 0.5～2% weight concentration, make slurries A;
2) the poly-p-phenylenediamine (PPD) fiber of Nomex and pulp goods thereof or Nomex poly m-phenylene diamine fiber and fibrid goods thereof and polyphenylene sulfide fibre are mixed and discongest, make slurries B by 0.1～1.5% weight concentration;
3) slurries A is mixed the formation paper making pulp with slurries B;
4) described paper making pulp is manufactured paper with pulp shaping;
5) the high pressure hot rolling obtains synthetic fibre paper.
7, the described preparation method of claim 6 is characterized in that further being included in the step that adds anti flocculant in the paper making pulp of step 3).
8, the described preparation method of claim 6, the linear pressure that it is characterized in that described high pressure hot rolling is 100～200kg/cm, hot-rolled temperature is 270～280 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100635132A CN100485123C (en) | 2006-11-07 | 2006-11-07 | Synthetic fiber paper containing basalt fiber and chemical fiber and its preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100635132A CN100485123C (en) | 2006-11-07 | 2006-11-07 | Synthetic fiber paper containing basalt fiber and chemical fiber and its preparation method |
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| CN1948615A CN1948615A (en) | 2007-04-18 |
| CN100485123C true CN100485123C (en) | 2009-05-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110582606A (en) * | 2017-06-15 | 2019-12-17 | 东丽株式会社 | Wet nonwoven fabric comprising meta-aramid and polyphenylene sulfide, and laminated sheet thereof |
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| CN105088855A (en) * | 2015-08-13 | 2015-11-25 | 合肥龙发包装有限公司 | High-temperature-resistant packaging paper |
| DE102017003559A1 (en) * | 2017-04-12 | 2018-10-18 | Diehl Aviation Laupheim Gmbh | Paper and honeycomb made from it |
| CN107808717A (en) * | 2017-09-30 | 2018-03-16 | 四川力智久创知识产权运营有限公司 | A kind of oil-impregnated paper insulation cable |
| CN111235958B (en) * | 2020-02-20 | 2022-02-25 | 陕西科技大学 | Method for dispersing basalt fibers and manufacturing insulating paper by adopting basalt fibers |
| CN112501949A (en) * | 2020-11-23 | 2021-03-16 | 江苏展宝新材料有限公司 | Polyaryloxadiazole fiber basalt composite material and preparation method thereof |
| CN113684727A (en) * | 2021-07-26 | 2021-11-23 | 通城县云水云母科技有限公司 | Basalt/aramid paper-based insulating material and production method thereof |
-
2006
- 2006-11-07 CN CNB2006100635132A patent/CN100485123C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110582606A (en) * | 2017-06-15 | 2019-12-17 | 东丽株式会社 | Wet nonwoven fabric comprising meta-aramid and polyphenylene sulfide, and laminated sheet thereof |
| EP3640398A4 (en) * | 2017-06-15 | 2021-03-17 | Toray Industries, Inc. | Wet nonwoven fabric containing meta-aramid and polyphenylene sulfide, and multilayer sheet of same |
| CN110582606B (en) * | 2017-06-15 | 2022-03-29 | 东丽株式会社 | Wet nonwoven fabric comprising meta-aramid and polyphenylene sulfide, and laminated sheet thereof |
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| CN1948615A (en) | 2007-04-18 |
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