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KR900700668A - 난연성, 고온저항성 폴리이미드섬유 - Google Patents

난연성, 고온저항성 폴리이미드섬유

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Publication number
KR900700668A
KR900700668A KR1019890701977A KR890701977A KR900700668A KR 900700668 A KR900700668 A KR 900700668A KR 1019890701977 A KR1019890701977 A KR 1019890701977A KR 890701977 A KR890701977 A KR 890701977A KR 900700668 A KR900700668 A KR 900700668A
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South Korea
Prior art keywords
fibers
fiber
high temperature
molded body
heat
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KR1019890701977A
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English (en)
Inventor
클라우스 바인로터
로베르트 포디우니히
Original Assignee
프리드리히 하우젠베르거, 알프레트 빔머
렌찡 악티엔게젤샤프트
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Publication of KR900700668A publication Critical patent/KR900700668A/ko

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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/74—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
    • D04H1/06—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres by treatment to produce shrinking, swelling, crimping or curling of fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/4334—Polyamides
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/50—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by treatment to produce shrinking, swelling, crimping or curling of fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2079/00—Use of polymers having nitrogen, with or without oxygen or carbon only, in the main chain, not provided for in groups B29K2061/00 - B29K2077/00, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/71—Processes of shaping by shrinking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3472—Woven fabric including an additional woven fabric layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3976—Including strand which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous composition, water solubility, heat shrinkability, etc.]
    • Y10T442/3984—Strand is other than glass and is heat or fire resistant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/40—Knit fabric [i.e., knit strand or strip material]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/40—Knit fabric [i.e., knit strand or strip material]
    • Y10T442/488—Including an additional knit fabric layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/659—Including an additional nonwoven fabric
    • Y10T442/671—Multiple nonwoven fabric layers composed of the same polymeric strand or fiber material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/682—Needled nonwoven fabric
    • Y10T442/684—Containing at least two chemically different strand or fiber materials
    • Y10T442/688—Containing polymeric strand or fiber material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/69—Autogenously bonded nonwoven fabric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/696—Including strand or fiber material which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous compositions, water solubility, heat shrinkability, etc.]

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)
  • Nonwoven Fabrics (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Reinforced Plastic Materials (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
  • Inorganic Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Insulated Conductors (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

내용 없음

Description

난연성, 고온저항성 폴리이미드섬유
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 원통형 주형상에서 본 발명에 따른 폴리이미드섬유 플리이스를 수축시킴에 의해서 얻은 삼차원 성형된 물품의 한 예를 보여준다.
제3도는 온도의 함수로서 섬유수축율 S(초기 섬유길이의 %)를 보여준다(곡
선 a).
비교로서 곡선 b는 "고수축섬유"로서 그 제작자에 의해 기술된 상업적으로 이용가능한 메타 아라미드 섬유의 수축상태를 보여준다.

Claims (10)

  1. -열의 영향하에서 0.3내지 1.1cN의 수축력을 전개하며, -열의 영양하에서 20 내지 60%의 섬유수출율을 나타내며, -0.5 내지 3%의 양의 용매 및 올리고머로 이루어진 그룹으로 부터의 저분자량 성분들을 함유하며, 열의 영향하에서 개개의 섬유들 사이에서 접착 결합들이 일어나는 것을 특징으로 하는, 다음 일반식(Ⅰ)의 구조적 단위체들에 기초한 난연성, 고온 저항성 폴리이미드 섬유 :
    상기식에서,
    R은 그룹CH2 및/또는 그룹또는이다.
  2. a) 280 내지 350℃ 바람직하게는 300 내지 330℃ 범위의 유리 전이 온도이상의 온도까지 가열할 때 이들 길이의 20 내지 60%까지 수축하며, b) 개개의 섬유들 사이에 접착 결합이 존재하며, c) 열처리되지 않은 섬유에 기초하여, 그들의 역가는 출발 섬유값의 300%까지 증가하며, d) 열처리되지 않은 섬유에 기초하여, 그들의 강도는 30%까지 감소하며, 그리고 e) 열처리되지 않은 섬유에 기초하여, 섬유 신율은 300%까지 증가하는 것을 특징으로 하는, 제1항에 기재된 바와같은, 열처리 된 난연성, 고온저항성 폴리이미드 섬유.
  3. 니들-펀칭에 의해 섬유들이 연결되고 부직포가 60g/㎡ 내지 3,000g/㎡의 면적중량을 갖는 것을 특징으로 하는, 열의 영향하에서 성형된 본체가 형성될 수 있도록 성형될 수 있는 제1항에 기재된 난연성, 고온저항성 폴리이미드 섬유들의 다루기쉬운 부직포.
  4. 280 내지 350℃, 바람직하게는 300 내지 330℃의 유리 전이온도 범위이상의 온도에서 열의 영향하에, 그리고 임의로 압력의 영향하에 성형된 본체가 섬유 복합체로부터 형성되는 것을 특징으로 하는, 제2항에 기재된 수축된 난연성, 고온저항성 폴리이미드 섬유의 성형된 본체.
  5. 제4항에 있어서, 5 내지 50N/㎟의 극한 인장강도, 5내지 80%의 파괴신율, 100 내지 500N/㎟의 탄성모듈러스 및 30N/㎟이하의 휨 강도를 갖는 것을 특징으로 하는 성형된 본체.
  6. 제4또는 5항에 있어서, 섬유들의 유리 전이온도이상의 온도까지 가열될 때 가소적으로 변형될 수 있는 것을 특징으로 하는 성형된 본체.
  7. 제4 내지 6항중 어느 한 항에 있어서, 1.20g/㎠의 최대밀도를 갖는 것을 특징으로 하는 성형된 본체.
  8. 제4 내지 7항중의 어느 한 항에 있어서, 소잉, 드릴링, 밀링 또는 그라인딩등에 의해 기계가공될 수 있는 것을 특징으로 하는 성형된 본체.
  9. 제1항에 기재된 섬유들의 복합체를 280 내지 350℃, 바람직하게는 300 내지 330℃이 유리 전이온도 범위 이상의 온도까지 가열하는 한편, 주형과 같은 성형수단을 사용하여 원하는 형상이 되게하며, 섬유들의 복합체의 초기밀도는 0.3cN 내지 1. 1cN의 수축력 전개와 함께 성형동안에 열배까지 증가되는 것을 특징으로 하는 다음 일반식(Ⅰ)의 구조적 단위체들을 갖는 폴리이미드 섬유들에 기초한 난연성, 고온저항성 섬유 본체들을 제조하는 방법 :
    상기식에서,
    R은 그룹CH2 및/또는 그룹또는이다.
  10. 제9항에 있어서, 성형동안에 섬유들의 복합체를 1 내지 30분간 가열하는 것을 특징으로 하는 방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019890701977A 1988-02-26 1989-02-20 난연성, 고온저항성 폴리이미드섬유 KR900700668A (ko)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0049588A AT391710B (de) 1988-02-26 1988-02-26 Schwer entflammbare hochtemperaturbestaendige polyimidfasern und formkoerper daraus
ATA495/88 1988-02-26
PCT/AT1989/000016 WO1989008161A1 (en) 1988-02-26 1989-02-20 Difficultly flammable high-temperature resistant polyimide fibers and molded bodies made from these fibers

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KR900700668A true KR900700668A (ko) 1990-08-16

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KR1019890701977A KR900700668A (ko) 1988-02-26 1989-02-20 난연성, 고온저항성 폴리이미드섬유

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CN111501200B (zh) * 2020-01-03 2021-05-07 北京化工大学 一种聚硅氧烷酰亚胺微纳多孔纤维无纺布的制备方法
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FI95727C (fi) 1996-03-11
DK534389A (da) 1989-10-26
WO1989008161A1 (en) 1989-09-08
PT89840A (pt) 1989-10-04
TR26459A (tr) 1994-02-16
FI95727B (fi) 1995-11-30
RU2075563C1 (ru) 1997-03-20
US5486412A (en) 1996-01-23
JP2935864B2 (ja) 1999-08-16
IE62061B1 (en) 1994-12-14
ATE89341T1 (de) 1993-05-15
AU629815B2 (en) 1992-10-15
AT391710B (de) 1990-11-26
IL89399A0 (en) 1989-09-10
NO176148B (no) 1994-10-31
JPH02503333A (ja) 1990-10-11
ATA49588A (de) 1990-05-15
NO176148C (no) 1995-02-08
EP0362312B1 (de) 1993-05-12
IL89399A (en) 1993-06-10
IE890611L (en) 1989-08-26
ZA891414B (en) 1989-11-29
CA1335149C (en) 1995-04-11
BR8905705A (pt) 1990-11-20
PT89840B (pt) 1994-01-31
HU891285D0 (en) 1990-04-28
US5271889A (en) 1993-12-21
FI894987A0 (fi) 1989-10-19
MX169974B (es) 1993-08-03
EP0362312A1 (de) 1990-04-11
AU3061789A (en) 1989-09-22
DK534389D0 (da) 1989-10-26
ES2013663A6 (es) 1990-05-16
NZ228126A (en) 1991-02-26
NO894253L (no) 1989-12-21
NO894253D0 (no) 1989-10-25

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