WO2015071155A1 - Production de composites par un procédé en un seul cycle - Google Patents

Production de composites par un procédé en un seul cycle Download PDF

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Publication number
WO2015071155A1
WO2015071155A1 PCT/EP2014/073876 EP2014073876W WO2015071155A1 WO 2015071155 A1 WO2015071155 A1 WO 2015071155A1 EP 2014073876 W EP2014073876 W EP 2014073876W WO 2015071155 A1 WO2015071155 A1 WO 2015071155A1
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WO
WIPO (PCT)
Prior art keywords
resin
foam core
foam
press
heating
Prior art date
Application number
PCT/EP2014/073876
Other languages
German (de)
English (en)
Inventor
Rainer Zimmermann
Original Assignee
Evonik Industries Ag
ZIMMERMANN, Cornelia
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 Evonik Industries Ag, ZIMMERMANN, Cornelia filed Critical Evonik Industries Ag
Publication of WO2015071155A1 publication Critical patent/WO2015071155A1/fr

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Classifications

    • 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
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
    • B29C70/865—Incorporated in coherent impregnated reinforcing layers, e.g. by winding completely encapsulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/08—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles using several expanding or moulding steps
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1228—Joining preformed parts by the expanding material
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3415—Heating or cooling
    • 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
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • B29C70/086—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers and with one or more layers of pure plastics material, e.g. foam layers
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/001—Producing wall or panel-like structures, e.g. for hulls, fuselages, or buildings
    • B29D99/0021—Producing wall or panel-like structures, e.g. for hulls, fuselages, or buildings provided with plain or filled structures, e.g. cores, placed between two or more plates or sheets, e.g. in a matrix
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • 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
    • B29C70/02—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers
    • B29C70/026—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising combinations of reinforcements, e.g. non-specified reinforcements, fibrous reinforcing inserts and fillers, e.g. particulate fillers, incorporated in matrix material, forming one or more layers and with or without non-reinforced or non-filled layers and with one or more layers of pure plastics material, e.g. foam layers
    • 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
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/18—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length in the form of a mat, e.g. sheet moulding compound [SMC]

Definitions

  • the method is characterized in that the
  • Foamed material is first heated in a device by means of near infrared radiation, transferred to a press with heatable clamshell tools and is connected there with two prepregs.
  • rigid foams are understood as meaning foams which can not be mechanically deformed with low forces, such as commercially available PU or polystyrene foams, and then reset again.
  • rigid foams are, in particular, PP, PMMA or highly crosslinked PU foams.
  • a particularly strong resilient hard foam material is poly (meth) acrylimide (PMI), as sold Zürn example from Evonik under the name ROHACELL ®.
  • Composite materials is the shaping of the cover layers with subsequent filling of the foam raw material and its final foaming.
  • a method is described for example in US 4,933,131.
  • a disadvantage of this method is that the foaming is usually very uneven. This is especially true for materials such as PMI, which can be added as granules at best.
  • Another disadvantage of such a method is that for
  • WO 02/098637 describes a process in which a thermoplastic cover material is melt-applied to the surface of a foam core material, then molded together with the foam core into a composite molding by means of a twin-sheet process, and then the thermoplastic is cooled in such a way. that the cover material solidifies in the mold.
  • a limited number of materials can be combined with this process. For example, fiber-reinforced cover materials can not be produced.
  • the method for the mere shaping of a foam workpiece is without
  • Foam materials limited to elastically deformable materials at low temperatures. A hard foam would be without such a procedure
  • Foam core blank first cut into shape and placed in a tool.
  • the melt of the thermoplastic material is injected onto the surface.
  • the foamed core blank is foamed thereon, which results in pressing on the surface of the covering material.
  • Foam material takes place.
  • the preheating takes place in an oven.
  • temperatures are required for thermoelastic deformation for many foam materials.
  • temperatures of at least 185 ° C are required for PMI foams.
  • the core material must be heated over the entire material area accordingly, in order to avoid material fractures.
  • many covering materials such as e.g. PP, so damaged that the process is not feasible.
  • PA 12 can be easily heated to over 200 ° C without damaging the plastic.
  • a simultaneous Shaping the foam core is not possible in this procedure, since the heat radiation of the IR radiation range does not penetrate into the foam matrix and thus no thermoplastic moldable state is achieved.
  • the choice of the surface material is relatively freely selectable, without this being damaged during processing.
  • Embodiments with the novel method fast cycle times of significantly less than 10 min to be feasible.
  • poly (meth) acrylimide means polymethacrylimides, polyacrylimides or mixtures thereof.
  • monomers such as (meth) acrylimide or (meth) acrylic acid.
  • acrylic acid is understood to mean both methacrylic acid and acrylic acid and mixtures of these two.
  • the objects are achieved by a novel process for the production of composite materials with a foam core of a hard foam, in particular with a foam core of P (MI), preferably with a foam core of PMI.
  • a foam core of P MI
  • PMI preferably with a foam core of PMI.
  • I can also rigid foams made of polypropylene (PP) or highly crosslinked polyurethane (PU) to foam cores in
  • PP foams are known above all as insulation material, in transport containers and as sandwich material. PP foams can contain fillers and are usually commercially available in a density range between 20 and 200 kg / m 3 . PU rigid foams in turn are distinguished from PU flexible foams by a more closed pore structure and a higher degree of crosslinking. PU rigid foams may additionally contain larger amounts of inorganic fillers.
  • the inventive method for producing composite materials with two outer layers and a foam core lying between them is characterized in particular by the following process steps: a) heating the foam core in a heating station with near infrared radiation (NIR radiation), b) transferring the heated foam core into a press by means of a transport device with a travel frame, c) closing the press, wherein the press has a two-shell mold and both tool shells are each covered with a fiber matrix or prepreg cover layer composed of a fiber material and a resin, d) heating the tool shells to the curing temperature of the
  • NIR radiation near infrared radiation
  • the foam cores are inserted into the machine-side effective range of the heating fields of the heating station.
  • NIR radiation with a wavelength between 0.78 and 1.40 ⁇ m is suitable. It proves to be particularly favorable if the foam core is already clamped in the transport device during the heating process.
  • the radiation intensity and duration are dependent on various factors and can be optimized for the skilled person with a few experiments.
  • these heating parameters are dependent on the softening temperature of the foam material used, the pore size or material density, the material thickness and the distance of the radiation sources to the foam core.
  • the radiation intensity usually has to be increased with stronger materials, a higher material density, a larger material thickness and a greater distance to the radiation sources.
  • the radiation intensity can be varied depending on the degree of transformation to be achieved.
  • the radiation intensity is usually adjusted so that in the middle of the foam core, a temperature between 170 and 250 ° C is achieved.
  • the heating station has a plurality of NIR light sources, so that the
  • Heat input can be brought about without at the same time causing damage to the material.
  • the e.g. Damage to the hard foam surface observed upon heating in an oven is maintained
  • Foam cells without absorption and causes a direct heating of the cell wall matrix are surprisingly, it was found that a particularly uniform heat distribution can be achieved in thicker foam cores by such heating with NIR radiation.
  • this transport device is provided with a linear motor drive.
  • the foam core is already entering the heating station in one with the
  • step c) followed by the closing of the press, wherein the press has a two-shell tool and both tool shells each with a
  • Prepreg or fiber matrix cover layer composed of a fibrous material and a resin are occupied.
  • the two-shell tool has a shape that acts predeterminably on the composite component during the pressing.
  • the material of the cover layers is prepregs.
  • Prepregs consist at least of a resin and a fiber material, wherein the fiber material again consist of long fibers, which are usually in the form of a fabric, knitted fabric, scrim or as an unidirectional (non-directional) layer. With such materials, particularly good mechanical strengths can be achieved.
  • prepregs are characterized by the fact that, although they are in a storable and processable form, they have not yet hardened. Only after the molding, or in the case of the present invention after the
  • the prepregs - usually by heat - hardened.
  • sheet-molding compounds can also be used as the material of the cover layer.
  • SMCs are characterized by the fact that they consist of at least one resin, short fibers and mineral fillers. The short fibers are distributed freely in the resin.
  • the resin used may be, in particular, vinyl ester resins, epoxy resins, isocyanate resins or acrylate resins. Prepregs are usually based on epoxy resins, while SMC contain predominantly vinyl ester resins.
  • the fibers may in particular be coal, glass, polymer or
  • Aramid fibers act. Most SMC uses short glass fibers.
  • adhesion promoters can be used to improve adhesion between the foam core material and cover layers. These adhesion promoters can be contained in the matrix material of the cover layers. Alternatively, the adhesion promoters also be applied to the surface of the outer layers or the foam core before merging. Alternatively, suitable adhesives may be used in this procedure. In particular, polyamides or poly (meth) acrylates have proven to be suitable as adhesion promoters. However, it is also possible to use low molecular weight compounds which are known to the person skilled in the art from the preparation of composite materials, in particular as a function of the matrix material used for the covering layer.
  • the cover sheet forming prepreg or SMC material is positioned in a tenter between the tool halves.
  • the material is fixed in the device by means of a hold-down frame to prevent slippage.
  • the material to be processed is e.g. a few inches above the edge of the tool and is in this area by means of the mentioned
  • step d) takes place as after closing the press and thereby taking place shaping a heating of the tool shells on the
  • Tool shells and the cover material can be done very fast curing of the resin.
  • the temperature used to cure the resin will depend on the particular resin used and will be readily apparent to those skilled in the art. As a rule, such temperatures are between 100 and 300 ° C. This is
  • Demolding temperature instead. This can be done, for example, in that the tool shells in the interior or on the side facing away from the workpiece with tubes for a cooling liquid, e.g. are equipped for water.
  • a cooling liquid e.g. are equipped for water.
  • Demolding temperature is material-dependent and easy to determine for the expert. It depends on the one hand on the plasticity of the foam core and primarily on the surface properties of the cover material. This should be at the Deformation be firm and have the least possible stickiness to the surface of the tool shells.
  • demolding temperature may already be below 80 ° C.
  • this temperature can be additionally increased to improve the cycle times.
  • demolding aids for example
  • Silicone oils or aliphatic oils come to the rescue.
  • process step f the opening of the press, the retraction of the travel frame and the removal of the product take place.
  • the inventive method has the particular advantage that it can be carried out with very low cycle times and thus can be used very well in a series production.
  • the process is preferably carried out with a cycle time of at most 10 minutes, preferably less than 6 minutes.
  • inventive method can also by means of a twin-sheet method under vacuum or under reduced pressure
  • the twin-sheet device is designed such that it can be used as a press molding machine.
  • the twin-sheet process is basically characterized by the fact that two or more workpieces in a single step in the vacuum or under reduced pressure deformed and thereby without additives such as adhesives, welding aids or
  • Solvents are welded together. This process step is to be carried out in short cycle times, economically and environmentally friendly. As part of the The present invention has surprisingly been found that this method by the additional process step of preheating the workpieces by irradiation with NIR radiation having a wavelength between 0.78 and 1, 40 ⁇ in
  • Hard foam materials that seemed to be unsuitable according to the prior art, can be used. Due to the relatively fast feasible heating with said radiation a stress-free, uniform heat distribution throughout the workpiece is achieved. The intensity of the radiation can be varied depending on the used foam material in said range. With additional use of cover materials, the temperature of the heating fields and their intensity are modified so that even with different
  • Foam core and cover materials are molded and bonded together. Such adjustments are easily feasible for the skilled person with a few attempts.
  • cover material is relatively free.
  • cover material may be, for example, pure thermoplastics, woven or knitted fabrics or composites thereof, e.g. so-called organo sheets or plastic-coated textile carrier webs such as e.g. Imitation leather act.
  • the cover material is preferably a fiber-reinforced plastic.
  • the fibers may in turn be, for example, aramid, glass, carbon, polymer or textile fibers.
  • the plastic in turn, may preferably be PP, polyethylene
  • PE polycarbonate
  • PC polyvinyl chloride
  • epoxy resin an isocyanate resin
  • acrylate resin a polyester or a polyamide.
  • a preferred material for the foam core is P (M) I, in particular PMI.
  • P (M) I foams are also referred to as rigid foams and are characterized by a particular strength.
  • the P (M) I foams become normally produced in a two-stage process: a) production of a cast polymer and b) foaming of this cast polymer.
  • monomer mixtures which contain (meth) acrylic acid and (meth) acrylonitrile, preferably in a molar ratio of between 2: 3 and 3: 2, as main constituents, are first prepared.
  • other comonomers may be used, such as e.g. Esters of acrylic or methacrylic acid, styrene, maleic acid or itaconic acid or their anhydrides or vinylpyrrolidone.
  • the proportion of the comonomers should not be more than 30% by weight.
  • Small amounts of crosslinking monomers, e.g. Allyl acrylate, can also be used. However, the amounts should preferably be at most 0.05% by weight to 2.0% by weight.
  • the mixture for the copolymerization further contains blowing agents which are in
  • Temperatures of about 150 to 250 ° C either decompose or evaporate and thereby form a gas phase.
  • the polymerization takes place below this temperature, so that the cast polymer contains a latent blowing agent.
  • the polymerization suitably takes place in block form between two glass plates.
  • the temperature then takes place at a corresponding temperature
  • PMI foams Foaming the cast polymer.
  • the preparation of such PMI foams is basically known to the person skilled in the art and can be read, for example, in EP 1 444 293, EP 1 678 244 or WO 201 1/138060.
  • PMI foams in particular ROHACELL ® types of the company Evonik Industries AG may be mentioned.
  • acrylimide foams are to be regarded as analogues for the PMI foams. For toxicological reasons, however, these are much less preferred than other foam materials.
  • the required foam parts can be produced by a suitable choice of the glass plates or by a production by means of an in-mold-foaming. Alternatively, the production of foamed foam plates by cutting, sawing or milling. In this case, preferably several foam parts can be cut from a plate.
  • the density of the rigid foam material is relatively freely selectable.
  • PMI foams can be used in a density range of 25 to 220 kg / m 3 .
  • Foam core surface This has the advantage that after curing a particularly strong adhesion at the interface between the foam core and
  • Composite materials comprise a hard foam core of foamed PP, P (M) I or highly crosslinked PU and two outer layers of at least one cured resin and a fiber material.
  • these composite materials differ in that the cover layers consist of a cured prepreg or SMC material and have no connecting elements such as seams, bolts or other force introduction elements.
  • the composite materials according to the invention may differ in that they need not have an adhesive layer between foam core and cover materials.
  • the workpieces of the invention are made of a rigid foam as a core material very widely used.
  • Composite materials prepared according to the invention can in particular
  • Fig. 1 Schematic representation of the production of composite components according to the invention
  • A heating-up phase
  • B shaping (1) IR heaters
  • the process is carried out on a twin-sheet forming machine such as model T8 from Geiss AG.
  • the machine was equipped in the following configuration:
  • PMI foam of the type ROHACELL ® IG in the density of 71 Kg / m 3 and the thickness of 12.7 mm.
  • the process parameters to be selected depend on the design of the system used in each case. They must be determined by preliminary tests.
  • the guide temperature T F depends on the T g (S) of the PMI foam matrix, after the forming temperature of the cover layers, after the
  • the radiator field intensity (I) can be varied. Near the edge of the hold-down, the radiator field intensity I near 100% is chosen to be a
  • Circulation of the cover layers It is possible, e.g. drapeable fabric / scrim or made of different fiber types or fiber blends composite materials are used, which are equipped with thermo-plastic phases. This can optionally be done using a melt adhesive film or web as
  • Bonding agents take place.
  • an 800 ⁇ m thick layer of organo-sheet from Bond Laminates (Tepex® Dynalite 102-RG600) was used at the top and bottom.
  • polycarbonate film Lexan in the thickness 1500 ⁇ was used on both sides.
  • the reshaped foam core is heated in the heating station by means of IR radiation to an internal temperature of 220 ° C and then moved into the press tool. On the two inner surfaces of the pressing tool said cover sheet blanks are placed. Subsequently, the pressing tool is closed and heated to a temperature of 180 ° C. After about 3 to 4 minutes, the tool is cooled to below 80 ° C and the component is removed. After a reheating of the tool, the production of the next composite component can begin.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un procédé de production de composites présentant un noyau de mousse en poly(méth)acrylimide-(P(M)I), en particulier en polyméthacrylimide-(PMI). Ledit procédé est caractérisé en ce que le matériau mousse est d'abord chauffé dans un dispositif, par rayonnement IR proche, transporté dans une presse pourvue d'un moule à deux coquilles pouvant être chauffées, et lié dans ladite presse avec deux préimprégnés.
PCT/EP2014/073876 2013-11-15 2014-11-06 Production de composites par un procédé en un seul cycle WO2015071155A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013223353.1A DE102013223353A1 (de) 2013-11-15 2013-11-15 One-shot Herstellung von Composites
DE102013223353.1 2013-11-15

Publications (1)

Publication Number Publication Date
WO2015071155A1 true WO2015071155A1 (fr) 2015-05-21

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PCT/EP2014/073876 WO2015071155A1 (fr) 2013-11-15 2014-11-06 Production de composites par un procédé en un seul cycle

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Country Link
DE (1) DE102013223353A1 (fr)
TW (1) TW201533109A (fr)
WO (1) WO2015071155A1 (fr)

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CN110972467A (zh) * 2019-05-31 2020-04-07 宁波瑞凌新能源科技有限公司 复合辐射制冷膜、复合辐射制冷膜材料及其应用
CN111271527A (zh) * 2020-03-04 2020-06-12 广东宇顺新材料科技有限公司 一种碳纤维-pmi复合管道及其制备方法

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