CA1277188C - Fiber reinforced thermoplastic articles and process for the preparationthereof - Google Patents

Fiber reinforced thermoplastic articles and process for the preparationthereof

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Publication number
CA1277188C
CA1277188C CA000493668A CA493668A CA1277188C CA 1277188 C CA1277188 C CA 1277188C CA 000493668 A CA000493668 A CA 000493668A CA 493668 A CA493668 A CA 493668A CA 1277188 C CA1277188 C CA 1277188C
Authority
CA
Canada
Prior art keywords
fabric
poly
yarn
arylene sulfide
filaments
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CA000493668A
Other languages
French (fr)
Inventor
James E. O'connor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Phillips Petroleum Co
Original Assignee
Phillips Petroleum Co
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Filing date
Publication date
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Publication of CA1277188C publication Critical patent/CA1277188C/en
Anticipated expiration legal-status Critical
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B15/00Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
    • B29B15/08Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
    • B29B15/10Coating or impregnating independently of the moulding or shaping step
    • B29B15/105Coating or impregnating independently of the moulding or shaping step of reinforcement of definite length with a matrix in solid form, e.g. powder, fibre or sheet form
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04Reinforcing macromolecular compounds with loose or coherent fibrous material
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/047Reinforcing macromolecular compounds with loose or coherent fibrous material with mixed fibrous material
    • C08J5/048Macromolecular compound to be reinforced also in fibrous form
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00Woven fabrics designed to make specified articles
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/47Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads multicomponent, e.g. blended yarns or threads
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/587Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads adhesive; fusible
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2281/00Use of polymers having sulfur, with or without nitrogen, oxygen or carbon only, in the main chain, as reinforcement
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00Inorganic fibres
    • D10B2101/10Inorganic fibres based on non-oxides other than metals
    • D10B2101/12Carbon; Pitch
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00Physical properties
    • D10B2401/04Heat-responsive characteristics
    • D10B2401/041Heat-responsive characteristics thermoplastic; thermosetting
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00Industrial
    • D10B2505/02Reinforcing materials; Prepregs
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628Nonplanar uniform thickness material
    • Y10T428/24636Embodying mechanically interengaged strand[s], strand-portion[s] or strand-like strip[s] [e.g., weave, knit, etc.]
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2904Staple length fiber
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2904Staple length fiber
    • Y10T428/2905Plural and with bonded intersections only
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2918Rod, strand, filament or fiber including free carbon or carbide or therewith [not as steel]
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2929Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2929Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
    • Y10T428/2931Fibers or filaments nonconcentric [e.g., side-by-side or eccentric, etc.]
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3065Including strand which is of specific structural definition
    • Y10T442/313Strand material formed of individual filaments having different chemical compositions
    • Y10T442/3138Including inorganic filament

Abstract

Abstract of the Disclosure Processes for preparing fiber reinforced thermoplastic articles are provided, for example, thermoplastic fibers and reinforcement fibers cam be intermingled to produce a composite yarn, which is used to weave a fabric, then the fabric heated to produce a reinforced article. As another example, thermoplastic yarn and reinforcement yarn can be woven together to produce a composite fabric, which, upon heating, produces a reinforced article.

Description

~.~7~7~

FIBRR REIN~ORCED ~IERMOPLAS'rIC ARTICLES
AND PROCESS EOR 'r~rE P~EPARATION THEREO~

Background This invention relates to process for the preparation of Eiber reinforced thermoplastic articles. In another aspect, this invention relates to novel fiber reinforced -thermoplastic articles.
Various methods have been employed to prepare fiber reinforced thermoplas-tic articles. Each method suffers from drawbacks which prevent the large scale use of the method for the preparation of such ar-ticles.
Thus, for example, hot mel-t application of thermoplastic to a reinforcement material is a very energy consuming process since large quantities of thermoplastic resin must be maintained in the melt form durin~ resin application. Solvent application methods introduce the consideration of restricting exposure of both worker and environment -to solvents. In addition, considerable process time and energy must be spent driving off excess solvent remaining after resin manipulation is completed. Another problem frequently encountered in the preparation of fiber reinforced thermoplastic articles is the nonuniform contact of thermoplastic resin with reinforcement, thereby resulting in a nonuniform fiber reinforced thermoplastic article.
Ob;jects of the Invention An object of the invention is an efficient process for the preparation of fiber reinforced thermoplastic articles.
Another object oE the invention is a process for the preparation of miEorm fiber reinforced thermoplastic articles.

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These and other objects of -the inven-tion will become apparent from the disclosure and claims provided herein.
Statement of the Invenkio In accordance with the invention, I have discovered that :Eiber reinforced articles can be prepared by weaving thermoplastic fiber together with reinforcing fiber and thereaf-ter melting the thermoplas-tic whereby intimate contact between the reinforcement material and the thermoplastic "matrix" is achieved. In a further embodiment oE this invent:ion, a hybr:id yarn containing individual fi.Laments of thermoplastic material and reinforcement material can be prepared, woven into a Eabric or chopped and layed up as a batt of non-woven fibers. Upon melting of the thermoplastic material, intimate contact between the thermoplastic and reinforcement materials results.
The product fiber reinforced thermoplastic articles are useful in a variety of applications where the chemical properties of the thermoplastic material and the physical in-tegrity imparted by the reinEorcement material are required, such as, for example, production of light-weight laminates and the like.
Detailed Description of the Invent~on In accordance with the present invention, a process is provided cornprising intermingling at least one fibrous thermoplastic material and at least one fibrous reinforcement material to produce a composite yarn, weaving the composite yarn into a fabric, and heating the fabric to a temperature at least as high as the melting point of the thermoplastic material for a -time sufficient to allow intimate con-tact be-tween the rnolten thermoplastic material and the fibrous reinforcement material.
In accordance wi-th another embodiment of the invention, a process is provided comprising in-termingling at least one fibrous thermoplas-tic material and at least one fibrous reinforcement material to prodllce a composite yarn, passing the composite yarn to a staple cutter to produce a composite staple, lay:ing up the composite stap:Le to produce a bat of compos:ite staple and heating the bat of composite staple to a temperature at least as high as the melting point of the thermoplastic material for a time sufficient to allow intimate contact between the molten thermoplastic material and the fibrous reinEorcement material.

~ .,.

31~20 Tn accordance with yet another embodiment of the present invention~ a process is provided comprising weaving at least one thermoplastic yarn with at least one reinforcement yarn to produce a composi-te fabric and heating the composite fabric -to a temperature at least as high as the melting point of the thermoplastic yarn for a time su~ficient to allow intimate contact between the molten thermoplastic yarn and the reinforce~lent yarn.
In accordance with a :Eurther embodiment of the invention, f:iber reinforced thermop'Lastic art:icles prepared in accordance with the above clescribed processes are also provided.
'rhermo~_astic 'Material The process of the preserlt invention can 'be applied to any thermoplastic fiber. The term "fi'ber" as used herein, refers -to either staple Ei'bers or contimlous fi'bers employed :in making of fabrics.
Typical examples of such fi'bers include those prepared from such thermoplastic materials as polyamides such as polycaprolactam and copolyamides, polyesters such as po].yethylene terephthala-te and copolyesters, polyacrylonitrile and copolymers of acrylonitrile, vinyl and vinylidine polymers and copolymers, polycarbana-tes, polyurethanes, polyester-amides, polyolefins such as polypropylene, fluorinated polyolefins, poly(arylene sulfide) compounds such as poly~phenylene sulfide) and the like and mixtures of any two or more thereof. Preferred fibers are prepared from poly(arylene sulfide) compounds since -the poly(arylene sulfides) have properties which make them suitable for a wide variety of applications.
WithoLI-t being limited thereto, lmcured or partially cured poly(arylene sulfide) whether hompolymer, copolymer, terpolymer and the like, or a 'blend of such polymers, can be used in the practice of the invention. The uncured or partially cured polymer is a polymer the molecular weight of which can be increased by either :Lengthen:ing a molecular chain or'by crosslinking or by combination oE both by supp'Lying thereto sufficient energy, such as heat. Sllita'ble ~po:Lytary:Lene su:Lfide) poLymers inclu{le, bnt are not Lim:ited to, those descr:ibed :in 'U.S.
3,354,12~. ~xamples o~ po:Ly(arylene sulE:ide) poLymers suitab].e for purpose of the invent:ion :include poly(2,~-to:Luene sul~ide), ~i ~J~, " ", .

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'' ' ' , ' ' ' ' poly(4,4'-biphenylene sulfide) and poly(phenylene sulfide). Because of its avai~ability and desirable properties (such as high chemical resistance, nonflammability, and high strength and hardness~
poly(phenylene sulfide) is the presently preferred poly(arylene swlfide).
The preferred poly(arylene sulfide) for use in this inventicn will have a flow rate of about 75-800 grams/10 minu-tes, determined according to ASTM D1238 modified to a temperature of 316C and a -total weight oE 5.0 Kg and preferably will have a flow rate of a'bout 100-500 grams/10 m:Lrlutes Most prefera'b:Ly, the poly(arylene sulfide) compound employed in the practice oE the :invention w:ill 'be prepared by the processes described in U.S. 4,282,347 and 'U.S. 4,350,810, and will have a flow rate of about 160-280 grams/~0 minutes. 'Polymeric material with high flow rates are preEerred 'because intimate contacting between the thermoplastic material and the reinforcement material is most readily5 achieved with such high flow rate compounds.
Reinforcement Any fibrous reinforcement material which will not melt or degrade under the treatment conditions detailed more fully below are suitab]e for use in the practice use of the present inven-tion.
Preferably, reinforcement materials employed in the practice of the invention will have melting poin-ts higher than the melting points of the thermoplastic materials employed. Suitable materials incLude, but are not limi-ted to, glass fibers, carbon fibers, aramid fibers such as, for example, poly(p-phenylene terephthalamide), boron -fibers, boron nitride fibers, ceramic fibers, metal fibers, such as for example, iron, nickel, chromium, copper, aluminum and the like, and mixtures of any two or more thereof.
Contacting Procedures A wide variety of techn:iques are suitable Eor causing the intimate contacting of the Ei'brous thermoplastic material and at least one fibrous reinforcement mater:ial. For examp'Le, at least one thermoplastic f:iber and at least one reinforcement f:i'ber can be intermingLed such as for example by braiding of severa'l fLbers together to pro~luce a composite yarn. '['he composite yarn can then'be woven into a fabric wh:ich is then ready Eor further treatment as detailed more fu:Lly below. Another means for causing :lntimate contact oE fi'brous ~t~ 31420CA

thermoplastic material and -fibrous reinEorcement material involves first intermingling at least one thermoplastic fiber and at least one reinforcement fiber as described above to produce a composite yarn. The composite yarn can be then be passed to a staple cutter to produce a composite staple. A composite batt laid up employing the composite staple can then'be prepared. Finally, the composite bat can be subjected to further treatment conditions as detailed more Eully below. Yet another process for bringing about the intimate contacting oE fibrous thermopLastic material and Eibrous reinforcement ma-terial involves prepar:ing a thermoplasti.c yarn from the fi'brous thermoplastic material and preparing a reinforcement yarn from the fi'brous reinforcement material, then weaving together at least one thermoplastic yarn with at least one reinforcement yarn to produce a composite fa'bric. The composite Eabric is then ready for further treatment as detailed more fully below.
The ratio of fibrous thermoplastic material to fibrous reinforcement material useful in the practice of the present invention can vary widely. ~or purposes of guidance, it is suggested that the quantity of fibrous reinforcement material employed constitute about 40 to about 80 wt.%, based on the total weight of the resulting fabric.
Preferably, the fibrous reinforcement material will be employed in the range of about 55 to about 65 wt.%, based on the total weight of the resulting fabric.
Treatment Conditions After the composite fabric or composite bat prepared in accordance with the present inven-tion is formed, the composite materials are subjected -to conditions of temperature and pressure for a time sufficient to allow intimate contact between the thermopastic material and the reinforcement material. Suitable tetnperatures are at least as high as the melting point of the thermoplastic material, bu-t not so high as to cause significant levels of thermoplastic degradation. By way of example, suitable temperatures Eor use with poly(pheny:Lene sulf:ide) are broadly about ~85 up to about 350C. Preferably, temperatures ranging from about 300 up to about 330C will be cmp'Loyed.
While not essential, the use of pressure to aid bringing about the intimate contacting of the thermoplastic material and the reinforcing material is desirable. Broad:Ly, pressures from atmospheric up to about 31~20CA
8~
500 psig are suitable. H:igher pressures are not believed to impart any additiona:L benefits and merely increase equipment and operating costs.
Preferably, pressures :in the range of abou-t 50 up to about 200 psig will be employed.
The amount of time during which -the composite fabric or composite 'bat is subjected to elevated temperature and pressure is that amount of time necessary to allow the so-Etened or melted thermoplastic rnaterial to come into intimate contact with the reinEorcement f:ibers. In addition, it :is desirabLe for the contact time to be sufficierlt to al:Low 'L0 for the escape of arly air entrapped :irl the compos:ite fa'bric or composite bat to escape form the composite structwre. Broadly, contact for about 1 minute up to about 60 minutes is suitable. Preferably, treatment conditions will be maintained for a period of about 5 to about 30 minutes. Most preferably, treatment conditions will 'be maintained for about 10 up to about 20 minutes, which time period is generally suffi.cient to ensure intimate contact between the thermoplastic material and the reinforcement fiber without requiring excessive time -for the trea-tment cycle.

Example I
This example illustrates the preparation of woven carbon-poly(phenylene sulfide) prepregs, i.e., impregnated composite material suitable for lamination and molding applica-tion. Two differen-t types of yarn were twisted together: (a) a carbon fiber yarn of 1717 denier containing 3000 filaments, coated with an epoxy sizing, marke-ted 25 as Thornel~ Type 300, WYP 30 1/10 by the Carbon Products Division of Vnion Carbide Corporation, New York, N.Y. and (b) a 850 denier Ryton~
polytphenylene sulfide) tPPS) yarn having a flow rate of 220 ~ 60 g/10 min tdeterm-ined according to ASTM 'D1238, modif:ied to a temperature of 316C and a total we:ight, -inclul(lirlg the we:ight of: the p:iston, oE 5.0 kg), 30 conta:ining 200 -Eilaments, marketed under the prod-lct de~;ignat:ion oE X02 by Phillips 'F:ibers Corporation, Greenv:ille, S.C.
A three-ply hybrid yarn was prepared by tw:isting two plies of the 850 denier PPS fiber yarn and one ply of the 17:17 denier carbon fiber yarn at a 10w twist of 2.5 t.p.:i. (twist per inctl) on a commercial twis-ting machine operated by Phi:Llips Fibers Corporation.

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~ he hybrid 3-ply yarn was then used for weaving -two fabrics:
one having a 10 x 10 endstinch (10 warp ends, 10 fill ends per inch) and the other one having a 16 x 10 ends/inch plain weave construction.
Weaving was done on a commercial weaving loom operated by Phillips Fibers Corporation. The fabric having the 10 x 10 construction weighed approximate:Ly 8.8 oz/yd2; it was 3 yards long and 18 inches wide. The 10 x 16 fabric weighed approximately 11 oz/yd2; was 1 1/3 yards long and 18 inches wide.
_ample II
The "prepreg" Eabric oE Example I prepared from hybrid yarns was laminated by placing from 2 to 10 plies o fabric, cut to a size of about 9" x 10", in a 9" x 10" metal mold cavity and compressing them at a temperature of about 595F (3l3C) and a pressure of about 200 psi for 15 minutes. The composite was then removed from the hot press, placed in a second press at room temperature and allowed to cool under 200 psi pressure. The fabric plies were laid up such that the warp yarns of all layers were oriented in the same direction and -the fills yarns were oriented at a 90 angle -to the warp yarns. Molded composite sheet height ranged from 0.02 inch for a 2-ply composite to about 0.08-0.09 inches Eor a 10-ply composite.
Pertinent physical properties of molded composite sheets are listed in Table I.

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Table I

Sample I Sample 2 Number of Plies 10 9 Weave Constr~lction (ends/inch) 10 x 10 16 x 10 5 Carbon Fiber Contentl), weight-% 61 63 Tensile Strenght2), psi 39,900 ~0,200 I~lexural Strength3), ps:i 36,500 36,900 ~lexura:l Modull~3)~ psi 5.3 x 106 5.4 x 102 Shear Strength , psi 3,250 3,740 ~ensity5), g/cc 1.53-1.56 1.51-1.55 1) determined after nitric acid digestion o~ PPS;
2) determined according to ASTM D 3039-79 in an INSTRON~ tensile tester, using 25.4 x 2.5 x 0.2 cm specimens cut from the molded sample with a water-cooled diamond saw; glass fiber-epoxy tabs were bonded to the grip area; and the crosshead speed of the tensile tester was 2 mm/minu-te.
3) determined by the three-point bending me-thod according to ASTM D
790-71, employing 12.7 x 1.3 x 0.2 cm specimens, a span to depth ra-tio of 32:1, and a crosshead speed of 2 mm/minute;
4) in-terlaminar shear strength was determined according to ASTM
D2344-72, employing a specimen of 19.1 x 6.4 x 2.0 mm size, a span to depth ratio of 4:1, and a crosshead speed of 2 mm/m:inute;
5) determined according to ASTM D792-66.

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~7~8 31420CA

The examples have been provided merely to illus-trate the practice oE ~y invention and should not be read so as to limit the scope of my invention in any way. Reasonable variations and modifications, not departing from the essence and spirit of my invention, are contemplated to be within the scope of paten-t protection desired and sought.

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Claims (39)

  1. The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

    l. A hybrid, low-twist yarn comprising a blend of individual continuous filaments of a poly(arylene sulfide) and individual continuous filaments of a fibrous reinforcement.
  2. 2. A yarn as in claim 1 wherein said filaments of said fibrous reinforcement are comprised of carbon.
  3. 3. A yarn as in claim 2 wherein said filaments of poly(arylene sulfide) are comprised of poly(phenylene sulfide).
  4. 4. A yarn as in claim 3 wherein said poly(phenylene sulfide polymer has a melt flow in the range of from about 75 to 800 grams per 10 minutes determined according to ASTM D1238 modified to a temperature of 316°C and a total weight of 5.0 kilograms.
  5. 5. A yarn as in claim 4 comprising from about 40 to about 80 weight percent, based on total weight of yarn, of said fibrous reinforcement.
  6. 6. A yarn as in claim 5 wherein said yarn is twisted about 2.5 twists per inch.
  7. 7. A fabric containing a hybrid, low-twist yarn formed from a blend of individual continuous filaments of a poly(arylene sulfide) and individual continuous filaments of a fibrous reinforcement.
  8. 8. A fabric as in claim 7 wherein said filaments of said fibrous reinforcement are comprised of carbon.
  9. 9. A fabric as in claim 12 wherein said filaments of poly(arylene sulfide) are comprised of poly(phenylene sulfide).
  10. 10. A fabric as in claim 9 wherein said filaments of fibrous reinforcement are comprised of carbon fibers.
  11. 11. A fabric as in claim 10 wherein said poly(p-phenylene sulfide) polymer has a melt flow in the range of from about 75 to 800 grams per 10 minutes determined according to ASTM D1238 modified to a temperature of 316°C and a total weight of 5.0 kilograms.
  12. 12. A fabric as in claim 11 comprising from about 40 to about 80 weight percent, based on total weight of fabric, of said fibrous reinforcement.
  13. 13. A process comprising subjecting a fabric comprised of a hybrid, low twist yarn formed from a blend of individual continuous filaments of poly(arylene sulfide) and individual continuous filaments of a fibrous reinforcement to a temperature and to a concurrently applied pressure sufficient to cause intimate contact between the thermoplastic and the reinforcement, said temperature being at least as high as the melting point of said poly(arylene sulfide), said subjecting being maintained for a time from about 1 to 60 minutes.
  14. 14. A process as in claim 13 wherein said temperature is in the range of from about 285°C to about 350°C.
  15. 15. A process as in claim 14 further comprising forming said fabric into the shape of a composite article.
  16. 16. A process as in claim 15 wherein said pressure is applied to said fabric while so formed into the shape of the composite article and is in the range of from about 50 to about 500 psig.
  17. 17. A process as in claim 16 further comprising subjecting a plurality of plies of said fabric to said conditions of temperature and pressure to form a laminated, composite article, wherein said laminated composite article is comprised of from about 40 to about 80 weight percent based on total article weight of said fibrous reinforcement material.
  18. 18. A process as in claim 17 further comprising subjecting said plurality of plies of said fabric to said conditions of temperature and pressure for a contact time sufficient to allow for the escape of air from the laminated composite article.
  19. 19. A process as in claim 18 wherein said plurality of plies is in the range of from 2 to 10.
  20. 20. A process as in claim 19 wherein said filaments of the fibrous reinforcement are continuous filaments.
  21. 21. A process as in claim 20 wherein said filaments of the fibrous reinforcement are selected from the group consisting of glass, carbon and aramid.
  22. 22. A process as in claim 21 wherein said filaments of the poly(arylene sulfide) thermoplastic comprise poly(p-phenylene sulfide) polymer.
  23. 23. A process as in claim 22 wherein said filaments of fibrous reinforcement comprise carbon fibers.
  24. 24. A process for the preparation of a fiber reinforced thermoplastic article, said process comprising:
    (a) intermingling continuous filaments of a poly(arylene sulfide) and continuous filaments of at least one reinforcement material to produce a composite yarn;
    (b) weaving said composite yarn into a fabric; and (c) heating said fabric to a temperature at least as high as the melting point of said poly(arylene sulfide) while maintaining a pressure sufficient to allow intimate contact between said poly(arylene sulfide) and said fibrous reinforcement material for a time of from about 1 to 60 minutes.
  25. 25. A process in accordance with claim 24 wherein said arylene sulfide polymer comprises poly(phenylene sulfide) having a melt flow of about 75 to about 800 grams per 10 minutes, determined according to ASTM
    D1238 modified to a temperature of 316°C and a total weight of 5.0 kg.
  26. 26. A process in accordance with claim 24 wherein said reinforcement material is selected from the group consisting of:
    glass, carbon, aramid, boron, boron nitride, ceramic, iron, nickel, chromium, copper, aluminum, and mixtures of any two or more thereof.
  27. 27. A process in accordance with claim 24 wherein said intermingling comprises braiding said filaments to produce said composite yarn.
  28. 28. A process in accordance with claim 24 wherein the weight %
    of said reinforcement material is about 40 to about 80%, based on the total weight of said composite yarn.
  29. 29. A process in accordance with claim 24 wherein said heating is carried out at a temperature of from about 285 to about 350°C.
  30. 30. The article produced in accordance with the process of claim 24.
  31. 31. A process in accordance with claim 24 wherein the quantity of said reinforcement material employed is maintained within the range of from about 40 up to 80 wt. %, based on the total weight of said composite yarn.
  32. 32. A process in accordance with claim 24 wherein from about 2 to 10 plies of said fabric are simultaneously subjected to said heating conditions as set forth in step (c).
  33. 33. A process in accordance with claim 24 wherein said fabric is subjected to molding prior to being subjected to said heating step (c).
  34. 34. A process for producing laminates from a plurality of carbon fibers, and a plurality of poly(arylene sulfide) fibers comprising:
    (a) combining said carbon fibers and said poly(arylene sulfide) fibers into yarn;
    (b) controlling the quantity of said carbon fibers during said combining step to be within the range from about 40 to 80 weight percent based on total weight of said yarn;
    (c) weaving said yarn in-to a fabric;
    (d) placing from 2 to 10 plies of said fabric together in a mold cavity; and, (e) heating said plies under pressure to melt said poly(arylene sulfide) and produce a shaped, carbon-poly(arylene sulfide) laminate.
  35. 35. A woven fabric for conversion into a laminate, said fabric being produced by:
    (a) combining carbon fibers and poly(arylene sulfide) fibers into yarn;
    (b) controlling the quantity of said carbon fibers during said combining to be within the range from about 40 to 80 weight percent based on total weight of said yarn; and, (c) weaving said yarn into a fabric.
  36. 36. A process for producing laminates from a plurality of individual continuous carbon fibers, and a plurality of individual continuous poly(arylene sulfide) fibers, comprising:
    (a) combining said carbon fibers and said poly(arylene sulfide) fibers into yarn;
    (b) weaving said yarn into a fabric and placing from 2 to 10 plies of said fabric together in a mold cavity; and (c) heating said plies under pressure to melt said poly(arylene sulfide) and produce a shaped carbon-poly(arylene sulfide) laminate.
  37. 37. A woven fabric for conversion into a laminate, said fabric being produced by:
    (a) combining graphite continuous carbon fibers and continuous poly(arylene sulfide) fibers into yarn; and (b) weaving said yarn into a fabric.
  38. 38. A process in accordance with claim 24 wherein said intermingling comprises twisting together said filaments to produce said composite resin.
  39. 39. A process in accordance with claim 24 wherein after said weaving and before said heating from 2 to 10 plies of said composite fabric are laid together in a laminate mold cavity and said heating is carried out upon said laminate for a time of from about 1 to 60 minutes.
CA000493668A 1984-11-19 1985-10-23 Fiber reinforced thermoplastic articles and process for the preparationthereof Expired - Lifetime CA1277188C (en)

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US672,762 1984-11-19

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AU4939285A (en) 1986-05-29
AU589916B2 (en) 1989-10-26
DE3586454D1 (en) 1992-09-10
US4800113A (en) 1989-01-24
JPH0346010B2 (en) 1991-07-12
DE3586454T2 (en) 1993-01-14
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US4925729A (en) 1990-05-15
ATE79125T1 (en) 1992-08-15

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