EP3481629A1 - Feuille composite à base de tissu et de polyétherimide à porosité contrôlée - Google Patents
Feuille composite à base de tissu et de polyétherimide à porosité contrôléeInfo
- Publication number
- EP3481629A1 EP3481629A1 EP17735144.2A EP17735144A EP3481629A1 EP 3481629 A1 EP3481629 A1 EP 3481629A1 EP 17735144 A EP17735144 A EP 17735144A EP 3481629 A1 EP3481629 A1 EP 3481629A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pei
- sheet
- fabric
- mol
- bar
- 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.)
- Pending
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/08—Impregnating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/024—Woven fabric
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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
-
- 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
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/10—Fibres of continuous length
- B32B2305/18—Fabrics, textiles
- B32B2305/188—Woven fabrics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/02—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/12—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2607/00—Walls, panels
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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
- C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
Definitions
- the present invention relates to a composite sheet of controlled porosity comprising a textile structure and polyetherimide (PEI), used in particular to serve as skin with controlled porosity in an in situ foaming process of thermoplastic materials. It also relates to a process for producing such sheets and their use in the manufacture of foamed sandwich panels.
- PEI polyetherimide
- the in situ foaming process is based on the use of skins ("facings” or “skins” in English) and a layer or film of thermoplastic polymeric material placed in the presence of a foaming agent, making it possible to produce a sandwich with foamed heart.
- the in situ process makes it possible to achieve, in a single step, adhesion between the skins and the foam that forms, especially when the skins comprise a compatible polymer material of the same nature or identical to the polymer material of the foam, allowing to obtain various adhesion mechanisms such as mechanical interlocking, self-adhesion through bonds between the polymer chains, adsorption (interatomic or intermolecular forces).
- a typical example is the sandwich comprising a polyetherimide-based foam and composite skins of glass fabric and thermoplastic polymer, which may also be PEI.
- the method comprises stacking the two or more PEI-impregnated glass cloth sheets, optionally with an impregnating solvent, and one or more plies of PEI film in the presence of a foaming agent (typical acetone), a precompacting, a heating with gradual opening allowing the foaming and the expansion of the foam.
- a foaming agent typically acetone
- the foaming solvent is in large quantity, typically about 20% by weight of the core, and one of the difficulties is to control its evacuation.
- Acetone may in particular have a tendency to soften the skins, to generate surface defects as well as a poor tension of these skins on the surface of the sandwich, and to limit the adhesion between the foam and the skins, with harmful consequences on the skin. mechanical performance.
- the invention aims to provide a composite sheet mono or multilayer textile structure / PEl of controlled porosity allowing in particular to solve these problems.
- Another object of the invention is to provide such a sheet which can be used in particular for serving as a skin in an in-situ foaming process for PEI-based thermoplastic materials, allowing an optimal evacuation of gases during the course of the process. foaming process, especially acetone, to obtain skin without surface defects and with good tension.
- Another object of the invention is to provide a method for obtaining such a composite sheet.
- a composite sheet comprising at least one textile structure and a polyetherimide (PEI), the latter impregnating and densifying (consolidating) the textile structure, the composite sheet having a certain porosity to acetone.
- PEI polyetherimide
- the composite sheet preferably has an acetone porosity of between about 3% and about 8% by weight of acetone absorption (greater than 99% pure), preferably between about 4% and about 5%, such as measured by the acetone method, consisting in measuring 40x40 mm of said composite sheet, dried for 2 h at 70 ° C, weighing the initial mass of the test piece, then placing the test piece in the acetone overlay for 24 hours, recover the specimen, wipe it and weigh it, compare with the initial mass and deduce the intake of acetone en masse.
- a composite sheet comprising at least one textile structure and a polyetherimide (PEI), the latter impregnating and densifying (consolidating) the textile structure, of the type prepared by a process comprising the having one fold of fabric or a plurality of superposed folds of fabric, impregnating it with PEI by dusting, or depositing a film of PEI on one or both sides of the fabric or stack, subjecting the stacking to a softening, then cooling and consolidation, using a continuous or semi-continuous molding.
- PEI polyetherimide
- This continuous or semi-continuous molding may be carried out with heating at a temperature of between about 300 and about 500 ° C, in particular between about 360 and about 400 ° C, for a period between about 30 seconds and about 3 minutes. More detailed process data is given below for each of the modes, continuous and semi-continuous.
- the two preceding are combined, the composite sheet produced by continuous or semi-continuous molding according to the second embodiment having the acetone porosity of the first.
- the following additional features apply to each of these three embodiments.
- the mass ratio of PEI relative to the total weight of the sheet may especially be between about 20 and about 50%, preferably between about 23 and about 43%, more preferably between about 30 and about 36%, for example about 33% .
- This mass ratio should be as regular as possible to have a homogeneous sheet and a porosity evenly distributed throughout the sheet.
- the mass ratio of PEI has a regularity of + 1-5%, preferably of +/- 3%, better of + 1-2%, or even less, by mass of resin on / in the whole sheet.
- the regularity can be measured according to standard EN2331, calcination method (NF EN 2331 May 1 993, Aerospace series - Textile glass fiber prepregs - Test method for the determination of resin and fiber contents and the mass per unit area fibers).
- the composite sheet comprises at least one textile structure and a polyetherimide (PEI), the latter impregnating and densifying (consolidating) the textile structure, the mass ratio of PEI relative to the total weight of the sheet is included between about 20 and about 50%, preferably between about 23 and about 43%, more preferably between about 30 and about 36%, for example about 33%, the weight ratio of PEI having a regularity of +/- 5%, preferably +/- 3%, better +/- 2%, or even less, by mass of resin on the whole of the sheet, and the sheet having a porosity of between about 3% and about 8% by weight of acetone absorption, preferably between about 4% and about 5% as measured by the acetone method.
- PEI polyetherimide
- the textile or fabric structure may in particular be formed of glass, carbon, basalt and blends, for example glass / carbon.
- the mass surface area of the glass fabric may in particular be between about 50 and about 600 g / m 2 , preferably between about 100 and about 400 g / m 2 .
- the glass threads may in particular have a title of 10 to 300 tex, and the carbon son may in particular have a title of 60 to 800 tex.
- the sheet may comprise in particular from 1 to 4 plies of textile structure
- the sheet may especially have a thickness less than or equal to about 3 mm, especially 2 mm.
- PEI polystyrene resin
- the monomer has a molecular weight of 592.61 g / mol.
- PEI of grade defined by the number-average molar mass (Mn), of between about 15,000 and about 50,000 g / mol, preferably between about 18,000 and about 30,000 g / mol. mol; for example, about 28,000 g / mol.
- the measurement method for determining the PEI grades is, in the usual way, gel permeation chromatography (GPC).
- GPC gel permeation chromatography
- About 25 mg of sample are weighed exactly.
- 10 ml of HFiP eluent are added.
- the dissolution is carried out at ambient temperature for 24 hours.
- the method preferentially uses 3 columns for more precision.
- the molar masses are calculated conventionally by PMMA calibration (in English "under PMMA narrow calibration”).
- the following eluent can be used: HFiP (hexafluoroisopropanol) - 0.1 M KTFA (potassium trifluoroacetate).
- HFiP hexafluoroisopropanol
- KTFA potassium trifluoroacetate
- the fabric, in particular glass, used during the impregnation with the PEI may be ecru, that is to say, a sized fabric (it includes the sizing in the term sizing) It may also be a fabric desensitized (including desizing), especially by a heat treatment (for example at about 400 ° C in an oven for about 72 hours).
- the ecru or desensitized fabric can be treated by what is called a finishing or
- the twill may be mentioned, especially for the flat appearance of the textile structure, and the satin, in particular for better drapability.
- Three different weaves and contextures were tested with Ec9 68tex glass: 8H satin of 305 g / m 2 23x21 yarn / cm; satin 4H of 220 g / m 2 19.5x12 yarn / cm; and twill 2/2 270 g / m 2 22/16 threads / cm.
- the different grammages make it possible to obtain different thicknesses and therefore different mechanical performances for composite plates of 1 or more plies.
- the impregnation of the textile structure by the PEI can in particular have been obtained by depositing the PEI on both sides of the textile structure by dusting or under the form of films.
- the present invention also relates to a method of manufacturing a composite sheet according to the invention, while one can also define the composite sheet by its method of obtaining.
- the PEI is deposited on one or both sides of the textile structure, and this can be advantageously achieved by powdering the PEI.
- Conventional dusting methods such as gravitational dusting and electrostatic powdering, can be used. Once the dusting is done, the assembly is pressed or calendered at a temperature above the softening temperature of the PEI.
- PEI films which can be deposited on one or both sides of the textile structure and the assembly is carried out. typically by pressing or calendering at a temperature above the softening temperature of the PEI.
- the softening temperature or Tg may be in particular of the order of 205 to 220 ° C for the PEI depending on the grades. However, in order to obtain adequate viscosities, in particular less than or equal to 1000 Pa.s, preferably to 600 Pa.s in the melt, it is preferable to heat between about 300 and about 500 ° C., in particular between about 360 and about 400 ° C. .
- the consolidation of a textile coated with polymer powder or laminated with a film is carried out statically in press without shear or in dynamics (with a running speed ⁇ 20m / min) under a negligible shear due to the wide air gap.
- the viscosity values are therefore given here at the indicated melt temperature, under almost zero shear, namely in particular between 10 -2 and 1 second -1 .
- the measurement can be carried out using a plane-plane Couette viscometer (the polymer being placed between two planes).
- PEI resins having an apparent viscosity of between 600 and 1500, in particular between 800 and 1200 Pa.s at 360 ° C., as measured under virtually zero shear, namely in particular between 10 -2 and 1, are used.
- the measurement can be carried out using a planar plane Couette viscometer.
- the deposition conditions of the invention make it possible to obtain the mass ratio of PEI with respect to the total weight of the sheet of between approximately 20 and approximately 50%, preferably between approximately 23 and approximately 43%, better still between approximately 30% and about 36%, for example about 33%, the mass ratio of PEI having a regularity of +/- 5%, preferably +/- 3%, better +/- 2%, better still +/- 1% or even less, in mass of resin on the whole of the sheet.
- the consolidation is done under conditions of adequate viscosity.
- This viscosity may in particular be less than or equal to 1000 Pa.s in the melt, preferably less than or equal to 600 Pa.s (almost nil shear measurement conditions, see above).
- the temperature may especially be between about 300 and about 500 ° C, especially between about 360 and about 400 ° C, especially depending on the grade of PEI used, to obtain this viscosity.
- rapid molding or consolidation methods namely continuous molding (consolidation) or molding (consolidation). semi-continuously.
- the duration of treatment at elevated temperature may in particular be limited to a duration of between about 30 seconds and about 3 minutes.
- two consolidation technologies can be used. These two technologies are not static, but are continuous or semi-continuous, integrating a certain rate of passage under pressure and a high temperature.
- Consolidation according to a continuous technology in which a pressure of between about 20 and about 100 bar may be applied, preferably between about 40 and about 80 bar, a temperature of between about 300 and about 500 ° C., in particular between about 360 and about 400 ° C. ° C, for a throughput rate of about 0.1 to about 5, preferably about 1 to about 2 m / min, for a high temperature treatment time of from about 30 seconds to about 3 minutes.
- Continuous technology of the isobaric type This technology combines the effect of temperature and pressure between two continuous metal strips that face each other.
- a temperature and a pressure of up to 100 bar (according to the invention it is set between about 20 and about 100 bar, preferably between about 50 and about 80 bar) by means of heating (for example by a heated oil) up to 500 ° C (according to the invention the temperature may be between about 300 and about 500 ° C, in particular between about 360 and about 400 ° C).
- the press has a hot zone, then a cold zone at the exit to facilitate demolding. Rates are in the range of about 0.1 to about 5, preferably about 1 to about 2 m / min, for a high temperature treatment time of about 30 seconds to about 3 minutes.
- Consolidation according to a semi-continuous technology in which a pressure of between about 5 and about 50 bar, preferably between about 10 and about 25 bar, a temperature between about 300 and about 500 ° C, in particular between about 360 and about 400 ° C, for a throughput rate of about 0.1 to about 5, preferably about 0.4 to about 1.2 m / min, for a high temperature treatment time of between about 30s and about 3 min.
- Semi-continuous technology is based on the principle of a single-plate compression press composed of hot and cold zones. The material to be consolidated is placed between 2 metal strips that pass between the plates of the compression press.
- the press opens a few millimeters (5 or 10) and the strips + the material is pulled down (by a clamp) a few centimeters (5 to 15), the press of closes for from 5 to 20 seconds. And so on. Both technologies require more or less thick metal strips treated with a suitable release agent.
- the leaves can at the end of production be evaluated with the following tests:
- Routine tests based on the information contained in this application make it possible to produce sheets having the porosity according to the invention. It can be specified that the process aims to contain the consolidation within the limits to obtain the porosity according to the invention. For a given PEI (of a certain grade, having a given application temperature), it is therefore necessary to choose the correct heating temperature, so that the PEI is at a viscosity of less than or equal to 1000 Pa.s, preferably at 600 Pa.s. Then, applying the heat treatment time to consolidate to the desired level for obtaining porosity.
- the composite sheet according to the invention may be defined as being obtained or capable of being obtained by a process comprising having a fold of textile structure or several superposed folds of textile structure, preferably having undergone a finishing, impregnating it with PEI on one or both sides of the textile structure or the stack, by softening (attaining a viscosity preferably less than or equal to 1000 Pa.s, in particular 600 Pa.s), then cooling the PEI (powdering or filming techniques, preferably), and consolidation, in particular by continuous or semi-continuous process, with heating to reach a viscosity of preferably less than or equal to 1000 Pa.s, in particular 600 Pa. s, for about 30s to about 3min. Pressures and temperatures were indicated above.
- the composite sheet is obtained or obtainable by a method comprising having a fold of textile structure or several superposed folds of textile structure, having undergone finishing with a silane (for example aminosilane or epoxysilane), to impregnate it with PEI by powdering or to deposit a PEI film on one or both sides of the textile structure or of the stack, by softening at a viscosity of less than or equal to 1000 Pa. .s, in particular to 600 Pa.s, then cooling of the PEI, and consolidation, in particular by continuous or semi-continuous process, with heating for about 30s to about 3min at a viscosity of less than or equal to 1000 Pa.s, especially 600 Pa.s.
- a silane for example aminosilane or epoxysilane
- the composite sheets thus produced can be used as skins in an in-situ foaming process of thermoplastic materials, allowing an optimal evacuation of the gases during the foaming process, in particular acetone, making it possible to obtain skins without surface defects and with a good tense.
- the level of porosity according to the invention makes it possible to fulfill the objectives of the invention and in particular to ensure a good surface tension, which is not possible with more or perfectly consolidated composite sheets, that is, that is, having a porosity lower than the scope of the invention.
- Impregnation of the PEI film or films it is possible to use one or more films which are superimposed) with a foaming agent, especially acetone; this will be called the heart;
- the assembly is placed between the platens of the press, preferably preheated, at a temperature above the glass transition temperature and taking into account the amount of foaming agent, it is typically between about 155 and about 210 ° C; a pressure is applied on the whole, it is typical to press around 40 bars; the whole is heated to the appropriate temperature for foaming, then it opens gradually press to develop the foam; then follows the cooling step.
- the method of measuring porosity by taking acetone can be further detailed as follows. It is derived from EN2378: fiber reinforced plastics - Determination of water absorption by immersion.
- test tube Place the test tube for 1 hour in a desiccator to allow it to cool
- This example is based on the use of a glass fabric made of glass fiber E of 68tex title with an average diameter of 9 ⁇ .
- This fabric has an 8H satin weave with an average thread count of 22.9 threads / cm in warp and 21.1 threads / cm in weft in order to obtain an average grammage after treatment close to 309 g / m 2 .
- this fabric is treated with a silane finish bath at 0.1% by weight to reach 303 g / m 2 .
- This treated fabric is impregnated with commercial PEI powder MW 55,000 g / mol (with GPC method calibrated with PMMA, MW 46842 g / mol, Mn 21 344 g / mol) by means of gravitational powder coating technology. 75 g / m 2 per side.
- the PEI powder is fixed on the glass cloth by softening and then cooling the polymer.
- the grammages and fiber content of the prepreg obtained were measured at 3 points according to EN2337 standard by calcination.
- the prepreg described above is consolidated via isobaric continuous compression technology on an installation having heating zones of a length of about 2.2 m.
- the consolidation conditions are as follows:
- Consolidated monoplates have the following properties:
- This example is based on the use of a glass fabric made of glass fiber E of 68tex title with an average diameter of 9 ⁇ .
- This fabric has 2/2 twill weave with an average thread count of 22.9 threads / cm in warp and 16 threads / cm in weft to obtain an average basis weight after treatment close to 285 g / m 2 .
- this fabric is treated with a silane-based finish bath at 0.1% by weight to reach 277 g / m 2 .
- This treated fabric is impregnated with the same MW 55,000 g / mol PEI powder as in Example 1, by means of gravitational powder coating technology. 68 g / m 2 per side.
- the PEI powder is fixed on the glass fabric by softening and cooling the polymer.
- the grammages and fiber content of the prepreg obtained were measured at 3 points according to EN2337 standard by calcination.
- the prepreg described above is consolidated via a semi-continuous compression technology, comprising a heating zone with a length of about 0.6 m.
- the consolidation conditions are as follows:
- Acetone uptake rate 4.9% by weight
- Chain direction traction module 21, 4 GPa
- This example is based on the use of a glass fiberglass fabric
- This fabric has an 8H satin weave with an average thread count of 22.9 threads / cm in warp and 21.1 threads / cm in weft in order to obtain an average grammage after treatment close to 309 g / m 2 .
- this fabric is treated with a silane finish bath at 0.1% by weight to reach 303 g / m 2 .
- This treated fabric is impregnated with PEI MW 55,000 g / mol powder (as in the previous examples) by means of a gravitational dusting technology at a rate of 75 g / m 2 per side.
- the PEI powder is fixed on the glass cloth by softening and then cooling the polymer.
- the grammages and fiber content of the prepreg obtained were measured at 3 points according to EN2337 standard by calcination.
- the prepreg described above is consolidated via sequential compression technology, on an installation comprising 3 presses of which 2 heated to 360 ° C and one to 80 ° C.
- the consolidated 2-ply plates have the following properties:
- Example 4 The composite sheets of Examples 1 to 3 were used to produce foamed sandwich panels, according to a standard method comprising the impregnation of PEI film with acetone (the core), the formation of the sandwich by placing the heart between two composite sheets according to the invention, placing the assembly between the two plates of a press, heating at a temperature above the glass transition temperature between about 155 and about 210 ° C while applying pressure is applied on the whole, obtaining the foaming and the progressive opening of the press to develop the foam, then cooling.
- a standard method comprising the impregnation of PEI film with acetone (the core), the formation of the sandwich by placing the heart between two composite sheets according to the invention, placing the assembly between the two plates of a press, heating at a temperature above the glass transition temperature between about 155 and about 210 ° C while applying pressure is applied on the whole, obtaining the foaming and the progressive opening of the press to develop the foam, then cooling.
- the composite sheets of Examples 1 and 2 made it possible to obtain sandwich panels with good adhesion between the foam core and the composite covering sheets. In contrast to the composite sheets of Examples 1 and 2, the composite sheets of Example 3 failed to obtain a good surface appearance.
- the continuous or semi-continuous molding process according to Examples 1 and 2 proves to be more efficient for producing high performance composite sheets for the foamed sandwich application.
- a characteristic of the composite sheets produced by these processes that emerges different between these two groups of molding process (Examples 1 and 2 versus 3) is, from the same grade of PEI, obtaining different acetone porosities. the processes of Examples 1 and 2 leading to higher acetone porosity.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Textile Engineering (AREA)
- Inorganic Chemistry (AREA)
- Reinforced Plastic Materials (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1656394A FR3053627B1 (fr) | 2016-07-05 | 2016-07-05 | Feuille composite a base de tissu et de polyetherimide a porosite controlee |
PCT/EP2017/066811 WO2018007460A1 (fr) | 2016-07-05 | 2017-07-05 | Feuille composite à base de tissu et de polyétherimide à porosité contrôlée |
Publications (1)
Publication Number | Publication Date |
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EP3481629A1 true EP3481629A1 (fr) | 2019-05-15 |
Family
ID=56842924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17735144.2A Pending EP3481629A1 (fr) | 2016-07-05 | 2017-07-05 | Feuille composite à base de tissu et de polyétherimide à porosité contrôlée |
Country Status (7)
Country | Link |
---|---|
US (1) | US11072146B2 (fr) |
EP (1) | EP3481629A1 (fr) |
JP (1) | JP7021178B2 (fr) |
CN (1) | CN109715383B (fr) |
CA (1) | CA3029649C (fr) |
FR (1) | FR3053627B1 (fr) |
WO (1) | WO2018007460A1 (fr) |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6015452B2 (ja) * | 1976-03-26 | 1985-04-19 | 積水化学工業株式会社 | 合成樹脂フイルムで被覆された軽量構造材の製造方法 |
US4889763A (en) * | 1986-10-22 | 1989-12-26 | Schreiner Luchtvaartgroep B.V. | Sandwich material and the use thereof |
CA2010674A1 (fr) * | 1989-03-08 | 1990-09-08 | Peter A. Guard | Formation par impregnation de composes thermoplastiques/tricot de verre thermoformables |
NL9200009A (nl) * | 1992-01-06 | 1993-08-02 | Martin Theodoor De Groot | Werkwijze voor het vervaardigen van een thermoplastische sandwichplaat. |
KR970700720A (ko) * | 1994-12-02 | 1997-02-12 | 마에다 가쯔노스께 | 프리프레그 및 섬유 강화 복합 재료(A Prepreg, and a Fiber Reinforced Composite Material) |
FR2735166B1 (fr) * | 1995-06-08 | 1997-08-29 | Aerospatiale | Procede de fabrication d'un panneau ou analogue a proprietes structurale et acoustique et panneau ainsi obtenu |
EP1045952B1 (fr) * | 1998-01-08 | 2006-09-13 | Acell Holdings Limited | Panneaux resistant aux intemperies |
JP2005238596A (ja) | 2004-02-25 | 2005-09-08 | Toho Tenax Co Ltd | 均一性に優れたプリプレグ及びその製造方法 |
WO2006080833A1 (fr) | 2005-01-31 | 2006-08-03 | Fits Holding Bv | Procede de fabrication d’un panneau sandwich et un tel panneau sandwich |
US20060194070A1 (en) * | 2005-02-25 | 2006-08-31 | Joshua Croll | Polyetherimide film and multilayer structure |
US20070141304A1 (en) * | 2005-12-21 | 2007-06-21 | Gaurav Agrawal | Perforated board formed from cementitious material and process and system for producing same |
US7790240B2 (en) * | 2007-09-13 | 2010-09-07 | Johns Manville | Permeable glass mat and method of preparation |
US20130164524A1 (en) * | 2010-04-14 | 2013-06-27 | John B. Letts | Construction boards with coated facers |
US20120107551A1 (en) | 2010-10-28 | 2012-05-03 | General Electric Company | Polyetherimide stitched reinforcing fabrics and composite materials comprising the same |
US20130220195A1 (en) * | 2012-02-28 | 2013-08-29 | Rob Sjostedt | High strength thermoplastic polymer films for strength and durability and related methods |
US20130260123A1 (en) * | 2012-03-30 | 2013-10-03 | Sabic Innovative Plastics Ip B.V. | Electrical insulation paper, methods of manufacture, and articles manufactured therefrom |
WO2014088905A1 (fr) * | 2012-12-07 | 2014-06-12 | Hanwha Azdel, Inc. | Articles comprenant des fibres non tordues et leurs procédés d'utilisation |
US10053801B2 (en) | 2014-01-28 | 2018-08-21 | Inman Mills | Sheath and core yarn for thermoplastic composite |
US20160053118A1 (en) * | 2014-08-21 | 2016-02-25 | Ticona Llc | Composition Containing a Polyetherimide and Low Naphthenic Liquid Crystalline Polymer |
US10822499B2 (en) | 2014-10-10 | 2020-11-03 | Sabic Global Technologies B.V. | Polyetherimide varnish compositions, methods of manufacture, and articles prepared therefrom |
JP5999721B2 (ja) | 2014-10-17 | 2016-09-28 | 株式会社日本製鋼所 | 繊維強化樹脂中間体及びその製造方法 |
-
2016
- 2016-07-05 FR FR1656394A patent/FR3053627B1/fr active Active
-
2017
- 2017-07-05 US US16/313,427 patent/US11072146B2/en active Active
- 2017-07-05 EP EP17735144.2A patent/EP3481629A1/fr active Pending
- 2017-07-05 JP JP2019500286A patent/JP7021178B2/ja active Active
- 2017-07-05 WO PCT/EP2017/066811 patent/WO2018007460A1/fr unknown
- 2017-07-05 CN CN201780042022.6A patent/CN109715383B/zh active Active
- 2017-07-05 CA CA3029649A patent/CA3029649C/fr active Active
Also Published As
Publication number | Publication date |
---|---|
CA3029649A1 (fr) | 2018-01-11 |
US20190160781A1 (en) | 2019-05-30 |
US11072146B2 (en) | 2021-07-27 |
CN109715383B (zh) | 2022-02-15 |
CN109715383A (zh) | 2019-05-03 |
JP7021178B2 (ja) | 2022-02-16 |
JP2019524925A (ja) | 2019-09-05 |
FR3053627A1 (fr) | 2018-01-12 |
WO2018007460A1 (fr) | 2018-01-11 |
FR3053627B1 (fr) | 2021-07-30 |
CA3029649C (fr) | 2024-05-21 |
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