WO2019148084A1 - Agent poisseux pour procédés de famille d'infusion de résine - Google Patents

Agent poisseux pour procédés de famille d'infusion de résine Download PDF

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Publication number
WO2019148084A1
WO2019148084A1 PCT/US2019/015387 US2019015387W WO2019148084A1 WO 2019148084 A1 WO2019148084 A1 WO 2019148084A1 US 2019015387 W US2019015387 W US 2019015387W WO 2019148084 A1 WO2019148084 A1 WO 2019148084A1
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WO
WIPO (PCT)
Prior art keywords
preform
layers
tackifier
resin
spekk
Prior art date
Application number
PCT/US2019/015387
Other languages
English (en)
Inventor
Scott Defelice
Anthony Decarmine
Original Assignee
Oxford Performance Material, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oxford Performance Material, Inc. filed Critical Oxford Performance Material, Inc.
Publication of WO2019148084A1 publication Critical patent/WO2019148084A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/543—Fixing the position or configuration of fibrous reinforcements before or during moulding
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
    • C08G65/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols
    • C08G65/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group
    • C08G65/4012—Other compound (II) containing a ketone group, e.g. X-Ar-C(=O)-Ar-X for polyetherketones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
    • C08G65/48—Polymers modified by chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/08—Ingredients agglomerated by treatment with a binding agent
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D171/00—Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2650/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G2650/28—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type
    • C08G2650/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group
    • C08G2650/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing oxygen in addition to the ether group containing ketone groups, e.g. polyarylethylketones, PEEK or PEK
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/24—Thermosetting resins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2471/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers

Definitions

  • the present invention generally relates to the field of resin transfer molding (“RTM”) processes and vacuum assisted resin transfer molding (“VARTM”) processes used for molding composite articles, and more particularly relates to advanced vacuum assisted resin transfer molding (“A- VARTM”) processes.
  • RTM resin transfer molding
  • VARTM vacuum assisted resin transfer molding
  • A- VARTM advanced vacuum assisted resin transfer molding
  • the invention also relates to carbon fiber reinforced plastics prepared using prepreg / autoclave processes.
  • composite parts are commonly used in the automotive, marine, industrial, and aerospace industries.
  • Carbon fiber reinforced plastics comprising carbon fibers (CF) and plastics such as an epoxy resin are lightweight and excellent in mechanical properties. Therefore, they have been used in wide applications including aircraft parts, automotive parts, building structures and sporting goods.
  • prepreg / autoclave process shown in Figure 5A have been a major process to fabricate high performance CFRP adequate for aircraft structures.
  • RTM resin transfer molding
  • the closed mold is put under vacuum prior to the injection, at atmospheric pressure, of the matrix to impregnate the reinforcing materials.
  • a vacuum assisted resin transfer molding (“LIGHT RTM”) or (“VARTM”) process Such a process is generally known as a vacuum assisted resin transfer molding (“LIGHT RTM”) or (“VARTM”) process.
  • LIGHT RTM vacuum assisted resin transfer molding
  • VARTM vacuum assisted resin transfer molding
  • the VaRTM process is illustrated in Figure 5B. It has the advantage to fabricate CFRP of large scale and complex shape at lower cost.
  • A- VARTM advanced VARTM
  • the mold is usually open and light weight compared to other RTM or VARTM processes.
  • a flexible vacuum bag is used to compress the layers of reinforcement materials on a complex mold shape.
  • the atmospheric pressure insures the proper compaction of the reinforcing materials and removes air in the bag. After impregnation of the reinforcing fibers with the matrix, the pressure on the bag becomes neutral.
  • tackifiers often thermoplastics, that are used to assist densification of the dry fiber preform by tacking fibers and fiber layers into place prior to infiltration of curing resins.
  • tackifiers enhances the density of the fiber preform by keeping otherwise loose fibers in close proximity, thereby leading to a higher performing composite structure.
  • This disclosure generically uses the term enabler to refer to an additive used in the resin transfer process.
  • additives such as processing and handling aids are applied to the dry fiber preforms for a variety of different purposes.
  • processing and handling aids are generally used in relatively low quantity by weight compared to resins, reinforcements and fillers, they perform critical functions. While additives and modifiers often increase the cost of the basic material system, these materials always improve cost/performance.
  • additives that are used to modify and enhance resin properties that become a part of the polymer matrix.
  • additives include: thixotropes, pigments & colorants, fire
  • retardants retardants, suppressants, uv inhibitors & stabilizers, conductive additives, and release agents.
  • Release agents facilitate removal of parts from molds. These products can be added to the resin, applied to molds, or both.
  • Zinc stearate is a popular mold release agent that is mixed into resin for compression molding. Waxes, silicones and other release agents may be applied directly to the surface of molds.
  • the release agents are applied to inhibit the composite from adhering to the mold after the infusion process.
  • the mold or outside of the composite is usually coated with a release agent such as a suitable wax so that the matrix material does not bond with the mold, which would make it effectively impossible to remove the component from the mold without damaging either one.
  • the release agent is applied to the mold and or composite during the laying up process.
  • Known release agents are polyvinyl alcohol, silicone wax, slip wax, etc. The release agent must be applied in a uniform thickness in order to ensure a smooth outer surface of the hardened component.
  • release agent it is not easy to apply the release agent so that these requirements are met, and, if improperly applied, an uneven release agent layer can result in an uneven or dimpled surface.
  • the types of release agent generally used contain volatile solvents, which pose a health risk to anyone exposed to them.
  • Another main disadvantage of having to use such a release agent is that, after curing, hardened remnants of the release agent can adhere composite.
  • a disadvantage of known systems and methods is that the cost is increased by requirement for multiple additive systems, such as a tackifiers, stabilizers, and additives.
  • Another disadvantage of known systems and methods is that multiple additive systems in the resin infusion process create complexity and - 4 - the opportunity for failure from unforeseen interactions between the various additive systems, which are generally serving conflicting purposes.
  • FIG. 1 is a schematic representation of a dry preform
  • FIG. 2 is a schematic representation of the preform of FIG. 1 with interlaced toughener/tackifier between layers of the preform;
  • FIG. 3 is a schematic representation of a composite having the preform with the interlaced toughener/tackifiers between the layers of the preform and infused with resin.
  • FIG. 4 is a schematic representation of the process used to form the composite of FIG. 3.
  • FIG. 5A is a schematic of a prepreg / autoclave process.
  • FIG. 5B is a schematic of a VARTM process.
  • FIG. 6 is a schematic of a portion of the VARTM process shown in FIG. 5B
  • the preforms 10 may have two outer layers 14 and one or more intermediate layers 14.
  • reinforcement/preforms 10 include, but are not limited to, layers 14 formed from one or more of tow, woven fabric, unidirectional fabric, braid, fiber, or 3D woven preforms.
  • the layers 14 of the preform 10 could be formed from carbon fibers, Fiberglass® E-or S glass fibers, Quartz, or Silicon Carbide (inorganic material in a fibrous condition or in the form of a loose mass of filaments or fibers), and/or Kevlar® fibers (man-made fibers).
  • layers 14 of the preform 10 could be formed from carbon fibers, Fiberglass® E-or S glass fibers, Quartz, or Silicon Carbide (inorganic material in a fibrous condition or in the form of a loose mass of filaments or fibers), and/or Kevlar® fibers (man-made fibers).
  • the fiber or fabric preform is tackified or coated with sPEKK.
  • a PEKK polymer is functionalized.
  • certain chemical groups are added to the basic structure of the molecule.
  • the functionalization step alters the wetting and solubility behaviors of the polymer.
  • the functionalized PEKK polymer can be blended with water to form a sizing composition.
  • An example of a functionalization for use with the present invention includes, but is not limited to sulfonation. Sulfonation of PEKK material results in a PEKK material that is soluble in water. It is possible to vary functionalization of the PEKK material so as to vary the solubility. In some embodiments, the functionalized PEKK material is soluble to the point of deliquescence. The functionalization step can be performed on the PEKK material after polymerization or in the synthetic path. After the PEKK material is functionalized, it is blended with water to form the sizing composition. It is possible to vary the viscosity of the sizing composition by adjusting the ratio of functionalized PEKK material to water. PEKK is functionalized to form sPEKK. Suitable polyetherketoneketones are available from commercial sources, such as, for example, certain of the polyetherketoneketones sold under the brand name OXPEKK by Oxford Performance Materials, South Windsor,
  • US201 10294943 discloses of method of sizing with PEKK the disclosure of which is incorporated by referenced.
  • US Publication No. US20150274588 discloses a method of sizing with sPEKK, the disclosure of which is incorporated by reference. 6
  • the tackifier 12 can be dispersed on the layers 14 of the reinforcement/preform 10 as a powder, in a film form coated on the layers 14 of the reinforcement, or as a veil laminated to the surfaces 40, 42, 44 and 46 of the layers 14 forming the preform 10.
  • the percentage of the tackifier 12 used may depend on the fabric and/or fiber used for the layers 14 of the preform 10.
  • the tackifier 12 would be present in an amount in the 5 to 10 wt % range based on the areal weight of the preform.
  • the percentage of tackifier can also be changed to put more where it is needed to increase the toughness of the composite and less in areas where toughness is not a requirement.
  • the tackifier 12 may be applied so as to cover all of the length of the surfaces 40, 42, 44, and 46 or so as to only cover selected regions of a respective surface 40, 42, 44, and/or 46, less than the entire length of the respective surface.
  • the sPEKK is blended with water to form a sizing composition.
  • the tackifiers 12 is dispersed on the layers as a sizing agent.
  • the sizing composition dries and creates a solid layer on at least a portion of a surface of the fiber.
  • the applied sizing composition is still water soluble as before the application because the applied PEKK is functionalized.
  • the applied PEKK preferably forms a relatively thin coating on the layer.
  • the coating may be from about 1 to about 50 microns thick.
  • the surfaces are completely covered by the coating, although in other embodiments certain portions of the fiber surfaces remain uncoated.
  • the coating may comprise from about 0.01 to about 10% by weight of the sized fibers.
  • tackifier 12 helps in laying up a part that has contour.
  • the tackifier 12 can be locally heated during layup to facilitate in - 7 - forming desirable shapes and contours.
  • the tackifier 12 can be locally subject to pressure to facilitate in forming desirable shapes and contours
  • Flow distribution media may be provided on top and bottom surfaces 18 and 20 of the composite to help improve the permeability in the through thickness direction.
  • the flow distribution media may be any open weave material which will survive the final cure temperature of the resin system, and has a much greater permeability than the preform being infused.
  • the vacuum bag can be attached to a heat source such as an integrally heated tool or can be placed into an autoclave or similar vessel.
  • Main resin 22 may be infused into the preform 10 by drawing a vacuum on the fiber and/or fabric layup. Once the preform 10 fills, the main resin 22 appears in the outlet line, which is then closed along with the main resin inlet. The composite is heated to a temperature that increases the main resin viscosity to a level that is higher than typical for infusion but is still low enough to allow the plies/layers 14 of the composite to be consolidated under pressure.
  • External pressure may be applied to the composite, and the main resin outlet from the bag is opened.
  • the opening of the bag allows residual main resin or entrapped gas to escape the composite.
  • the external pressure may be in the range of low pressures from 50 psi to 100 psi to high pressures in the range of thousands of psi.
  • the external pressure causes compaction of the composite to the target fiber volume.
  • the composite is then heated up to the cure temperature.
  • the composite as shown in FIG. 3, may comprise layers 14 of fibers and/or fabric, the tackifier 12 joined to the layers 14, and layers 22 of main resin intermediate the layers 14 with the tackifier 12. 8
  • Fiber volumes in excess of 60% and void volumes less than 2% may be achieved using the process described herein. This makes the process acceptable for structural composite components that require impact resistance and damage tolerance. For example, the process described herein could be used to form lighter weight fan containment cases.
  • the properties of the overall composite performance can be tailored. Segments of the part can be locally toughened to increase damage tolerance, while other areas that do not need this requirement can be unmodified. This can be done by providing the tackifier 12 in selected portions of the preform 10 where toughening or strengthening is required. By having a functionally graded preform, a designer can achieve a mechanical performance while optimizing the structure for weight.
  • the main resin 22 may comprise any suitable thermoset resin matrix type known in the art including, but not limited to, an epoxy resin, a bismaleimide resin, a polyimide resin, and mixtures thereof.
  • Some embodiments of the present invention include the step of heating the applied sizing composition to a temperature at or above the defunctionalization temperature of the PAEK polymer, for example in reference to sPEKK to between 300°C - 400°C. This heating causes the functional groups to detach from the PAEK polymer, resulting in an applied sizing composition that is less water soluble. In this way, it is possible to recover the desirable solvent resistant behaviors in the original polymer after it has been applied to the fiber.
  • the applied sizing composition is heated to a temperature at or above the fusion point of the PAEK polymer, thereby enhancing the bonds of certain systems.
  • the applied tackifiers is subjected to heat and pressure prior to assembly of the preform.
  • the inventors have discovered that an sPEKK-based tackifier enables the formation of near net thickness and net shape rigid preforms by the
  • a non-woven veil is place between layers of the preform.
  • the non-woven veil may serve as a tackifier.
  • the non-woven veil is fabricated using sPEKK as a feedstock. It is known that very high temperature thermoplastics are difficult to form into non- wovens, especially thin non-wovens, due to oxidation at high temperatures or viscosity issues typical to such resins. The inventors have discovered that the use of sPEKK as a feedstock to make very fine non-woven veil provides a workaround for these issues.
  • sPEKK is soluble in water and other innocuous solvents, it can be prepared to various solution viscosity options and processed variously.
  • a fiberizing method is used prepare the sPEKK veil. This approach uses a pneumatic fiberizing system, in the manner of systems supplied by Nordson - typically for hot glue
  • an alternate manner of preventing the soluble sPEKK to be re-dissolved requires the use of a saturated solution carrying an available metal ion (group I or II metals have been used but this is no limitation) to form the acid salt from the acid form of sPEKK.
  • This has the effect of reducing or eliminating solubility without thermal process or defunctionalizing the polymer. Swelling may occur during the process and is needed to carry the metal to the acid locations, but this can be subsequently dried post process.
  • Electrospinning is used to form the sPEKK veil. Electrospinning is the formation of nano-scale fiber bodies (as opposed to the formation of micron scale fiber bodies with a fiberizer). This known process uses an intense electrical field to assist the formation of ultra-fine fibers. A solution is ejected from a small opening as a liquid jet - this jet is engaged by the intense electrical field in the spinning machine and pulled faster than the ejection velocity, resulting in a pulling effect, drawing the fiber smaller than a physical orifice could be made.
  • Submicron fibers are readily made this way.
  • the impact location for the drawn fiber is usually one of the electrodes creating the field - which may be stationary, rotating or traversing such that the deposit is an evenly distributed nano-structured fiber veil.
  • This process is aided by the use of volatile solvents (which may include water, if the temperature and pressure are appropriate) that allow the fiber to deposit dry or nearly so, as with the prior method.
  • Post- processes are similar.
  • Veil made by these routes are useful for other purposes.
  • Surgical mesh is one such alternate use, as is filtration media and structures for spacecraft - the latter possibly benefitting from an applied metal coating to protect the veil from ionizing radiation, heat, atomic oxygen and so forth.
  • a blend of sPEKK and pinning aids can also be applied to create a composite PEKK/CNT interface layer with a thickness measured in microns and rich in pinning aids to further the usefulness of the system by enhancing in-service performance.
  • the application may be a contiguous layer or a sprayed pattern to prevent occlusion of the prepreg (if that is desired).
  • the present invention is applicable in the prepreg /autoclave process illustrated in FIG. 5A.
  • Laminates structures are rate limited, in general, by their inter-laminar strength.
  • Various approaches have been attempted to improve this inter-laminar behavior.
  • tiny pinning inclusions like CNT are included into the matrix resin to provide added engagement at the interface. This mode of addition cannot provide the expensive additives to the desired location - selectively introducing to the surface of the prepreg is preferable.
  • a carrier material that suits is sPEKK.
  • sPEKK is water soluble derivative of the high performance polymer PEKK. Pinning additives like CNT or Halloysite are readily blended into such aqueous solutions. sPEKK can be converted to PEKK thermally. PEKK is a known strongly adhesive material used in laminate systems and is affine for various high temperature thermoplastics.
  • An sPEKK-based tackifier enables the formation of near net thickness and net shape rigid performs by the simultaneous application of 12 heat and pressure (either mechanically or by vacuum) that can then be assembled into complex components prior to resin infusion by either vacuum or closed mold high pressure resin transfer allowing for the fabrication of highly complex structural composite products.
  • a blend of sPEKK and pinning aids can be applied to a prepreg tape, the tape can be heated (locally or bulk) thru the conversion temperature to create a composite PEKK/CNT interface layer with a thickness measured in microns and rich in CNT.
  • the application may be a contiguous layer or a sprayed pattern to prevent occlusion of the prepreg (if that is desired).
  • a similar process may be affected against an appropriate carrier substrate and transferred to a prepreg.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Reinforced Plastic Materials (AREA)
  • Moulding By Coating Moulds (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un procédé de formation d'une structure composite consistant à utiliser une pluralité de couches présentant un ou plusieurs éléments parmi une fibre ou un tissu ; à appliquer un agent poisseux à chacune des couches, les agents poisseux comprenant du sPEKK en quantité sélectionnée pour fournir une adhérence pour le procédé de superposition et pour servir d'agent antiadhésif ; à assembler une préforme avec la pluralité de couches ; à faire infuser une résine dans la préforme.
PCT/US2019/015387 2018-01-26 2019-01-28 Agent poisseux pour procédés de famille d'infusion de résine WO2019148084A1 (fr)

Applications Claiming Priority (2)

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US201862622409P 2018-01-26 2018-01-26
US62/622,409 2018-01-26

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100276828A1 (en) * 2001-06-11 2010-11-04 The Boeing Company Resin Infusion Mold Tool System And Vacuum Assisted Resin Transfer Molding With Subsequent Pressure Bleed
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US20140179187A1 (en) * 2012-12-20 2014-06-26 Cytec Technology Corp. Liquid binder composition for binding fibrous materials
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