EP3478500A1 - Vitrage aeronautique comprenant une feuille de polymere acrylique a proprietes mecaniques ameliorees - Google Patents
Vitrage aeronautique comprenant une feuille de polymere acrylique a proprietes mecaniques amelioreesInfo
- Publication number
- EP3478500A1 EP3478500A1 EP17737003.8A EP17737003A EP3478500A1 EP 3478500 A1 EP3478500 A1 EP 3478500A1 EP 17737003 A EP17737003 A EP 17737003A EP 3478500 A1 EP3478500 A1 EP 3478500A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- modified acrylic
- glazing
- aeronautical
- pmma
- 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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Definitions
- the invention relates to aeronautical glazing whose use is particularly demanding: impact to the bird, pressure differences between the outside and the inside, exposure to very low temperatures outside. For these windows it is necessary to ensure a high level of mechanical strength, transparency and optical quality sustainably preserved. It is known to physically modify a sheet of polymeric material such as acrylic, especially poly (methyl methacrylate) (PMMA) by stretching, for example in two perpendicular directions in the plane of the sheet (bi-stretching), to obtain it.
- PMMA poly (methyl methacrylate)
- the invention is given the task of using transparent polymers, especially acrylic polymers, comprising in their polymer chain nanostructured blocks and / or additives of micro- or nanofillers limiting crack propagation, for applications of complex transport glazings with properties.
- These modified polymers do not require a heavy drawing process and offer greater ease of forming by thermoforming (dimensional stability); they are not prestressed, they offer increased safety in case of exposure to heat (eg airplane windows).
- the invention therefore relates to an aeronautical glazing comprising at least one modified acrylic sheet, characterized in that it is associated with at least one other modified acrylic sheet, and / or at least one poly sheet (Methyl methacrylate) (PMMA) from casting, and / or at least one sheet of another transparent polymer such as polycarbonate (PC), and / or at least one glass sheet, in particular chemically reinforced, into a laminated glazing unit and / or multiple.
- PMMA Metal methacrylate
- PC polycarbonate
- modified acrylic is understood to mean a chemically modified acrylic transparent polymer for improving its mechanical properties, which has the following characteristics:
- Non-notched Charpy impact strength 35, preferably 40 kJ / m 2 ;
- a laminated glazing unit comprises a plurality of transparent mineral (glass) and / or organic (polymeric material) rigid sheets connected to one another by interlayer adhesive layers detailed below.
- a multiple glazing unit is a plurality of monolithic transparent transparent sheets and / or laminated sheets, mineral and / or organic, separated from each other by a blade of air or dry gas.
- the modified acrylic is an acrylic polymer with improved mechanical properties comprising in its polymer chain nanostructured blocks and / or additive of micro- or nanofillers limiting the crack propagation.
- the poly (methyl methacrylate) (PMMA) from casting is physically modified to withstand stress relaxation by micro-folding.
- the physical modification consists in particular of a bi-stretching, it is interesting in that it allows to pierce the PMMA or when it is on the outside of a glazing subjected to cold, mechanical abrasion, without microcracks are formed in the PMMA sheet.
- a modified acrylic sheet is bonded to another modified acrylic sheet or to a sheet of poly (methyl methacrylate) (PMMA) from casting, or else to a sheet of glass via polyvinyl butyral ( PVB) free of plasticizer reactive with acrylics, or thermoplastic polyurethane (TPU);
- PMMA poly (methyl methacrylate)
- PVB polyvinyl butyral
- thermoplastic polyurethane (TPU) a modified acrylic sheet is glued to a polycarbonate sheet (PC) via thermoplastic polyurethane (TPU);
- At least one modified acrylic sheet is overflowing with respect to the sheets of the glazing made of another material, especially when the high mechanical quality of this material is used to pierce the projecting parts for mounting the glazing by bolting or equivalent, or for mounting the glazing by pinching; - he is bulging.
- the invention also relates to the application of aeronautical glazing as described above as glazing for an air vehicle, including a helicopter or an airplane, whether it is a transport vehicle, combat, or of a fighter plane.
- an aeronautical double glazing according to the invention is composed of
- a PMMA sheet derived from casting 2 physically modified, such as by stretching, or not, of thickness at least equal to 0.5, preferably 3 mm, at most 25, preferably 8 mm, polymer aeronautical grade acrylic marketed by Evonik® under the reference GS 249.
- the modified acrylic sheet 1 is preferably the outer face of the glazing, that is to say exposed to the outside atmosphere, but it is not excluded that it constitutes on the contrary the inner face, and that in this case the aeronautical grade acrylic polymer sheet constitutes the outer face of the glazing.
- the aeronautical glazing shown in FIG. 2 differs from that of FIG. 1 in that it is composed of two modified acrylic sheets 1 and 1, and in that the sheet 1 constituting the outside face of the glazing, here has a thickness at least 0.5, preferably 3 mm, at most 25, preferably 8 mm, the sheet 1 'being identical to the sheet 1 of Figure 1.
- FIG. 3 represents an aeronautical double glazing composed of a three-component laminated glazing unit 1, 3, 2, an air gap 10 and a PMMA sheet resulting from casting 2 '.
- the modified acrylic sheet 1 is identical to that 1 of FIG.
- the two sheets of PMMA from casting 2, 2 ' have a thickness of at least 0.8, preferably 1.5 mm, at most equal to 80, preferably 12 mm.
- the modified acrylic sheet 1 and the PMMA sheet derived from casting 2 are adhered by means of an interlayer adhesive 3 having a thickness of at least 0.1, preferably 0.38 mm, at most equal to 20, preferably 2.5 mm, in particular equal to 1.25 mm.
- the interlayer adhesive 3 is made of thermoplastic polyurethane (TPU) marketed by the Huntsman Company under the registered trademark Crystalflex® PE 399 or 499 and the sheets of modified acrylic 1 and PMMA from casting 2 are subject to prior to the laminated assembly, priming with a composition based on methyl methacrylate and organosilanes 1 -Propanamine, 3- (triethoxysilyl) and 2-ethanediamine, N- [3- (trimethoxysilyl) propyl] -1 marketed under the respective names DOW CORNING® Z-601 1 SILANE and DOW CORNING Z-6020® SILANE.
- TPU thermoplastic polyurethane
- the interlayer adhesive 3 consists of polyvinyl butyral with a plasticizer that does not react with acrylics, marketed by Eastman Solutia under the name PVB DB 31 or PVB DS 31 and the modified acrylic sheets 1 and PMMA from casting 2 are subjected, prior to assembly in laminated, priming by a composition based on methyl methacrylate.
- the modified acrylate sheet 1 constitutes the face of the glazing exterior to the air vehicle.
- FIG. 4 shows a symmetrical laminated aeronautical glazing unit in which two sheets of chemically toughened glass 4, 4 'of thicknesses at least equal to 0.1, preferably 0.55 mm, at most equal to 20, preferably 8 mm, are glued on both sides of a modified acrylic sheet 1 identical to that of Figure 1 through a layer adhesive insert 3, 3 'identical to that of Figure 3 in thermoplastic polyurethane.
- the aeronautical glazing of Figure 5 differs from that of Figure 4 only in that the modified acrylic sheet 1 is overflowing.
- the projecting portion of this sheet may be pierced for mounting the glazing by bolting, or the glazing mounted with pinching including this flowing portion.
- the aeronautical glazing of FIG. 6 is asymmetrical and differs from that of FIG. 5 in that a glass sheet and its associated interlayer adhesive layer on one side of the modified acrylic sheet 1 are removed. The latter is able to constitute both the outer and inner face of the glazing.
- the aeronautical glazing of FIG. 7 differs from that of FIG. 6, and that of FIG. 8 from that of FIG. 5 only by the addition of a thin functional layer 20 on the internal face of the laminate of the sheet of FIG. glass 4, respectively 4 '.
- the functional layer 20 is, for example, a heating layer such as tin-indium oxide (ITO for Indium Tin Oxide), with defrosting and / or demister function, or a thermal control layer such as antisolar (reflecting solar radiation).
- FIG. 9 differs from FIG. 8 only in that the two sheets of glass 4, 4 'and not one alone bear on their internal face a functional layer 20, 21.
- FIG. 10 shows a laminated aeronautical glazing of several modified acrylic sheets 1, 1 ', 1 "glued to each other by interlayer adhesive layers 3, 3' as previously described, after having been subjected to a treatment of
- each modified acrylic sheet 1, 1 ', 1 " can be replaced by a laminate similar to that of Figure 10, just as each sheet of glass 4, 4' can be replaced by a laminate of several glass sheets bonded to each other by interlayer adhesive layers of PVB or equivalent.
- a laminated aeronautical glazing consists of two sheets of modified acrylic 1, 1 'glued to either side of a sheet of polycarbonate 5 of thickness at least equal to 1, preferably 2.5 mm, at most equal to 12 mm, by means of interlayers adhesive layers 3, 3 'of thermoplastic polyurethane (TPU) (not including a plasticizer which would be susceptible to attack the polycarbonate), after the two modified acrylic sheets 1, 1 'have been awarded according to the first variant described above.
- TPU thermoplastic polyurethane
- the invention also extends to a laminate comprising the structure obtained from that of Figure 1 1, by removing the modified acrylic sheet V and the TPU layer 3 ', and coating the surface thus become free of the polycarbonate sheet 5 with a coating or scratch-resistant hard coat, in particular of the polysiloxane type.
- a coating or scratch-resistant hard coat in particular of the polysiloxane type.
- An example of polycarbonate sheet coated on one side with an anti-scratch coating is a sheet marketed by Sabic Innovative Plastics under the registered trademarks Lexan® Margard® HLGA3.
- the polycarbonate surface coated with a hard scratch-resistant coating constitutes an outer face of a laminated glazing unit, preferably intended to be exposed to the interior atmosphere of an overhead vehicle cabin.
- the aerospace glazing shown in Figure 12 differs from that of Figure 1 1 in that the modified acrylic sheets 1, 1 'overflowing that of polycarbonate 5.
- the latter is fragile, can not be pierced.
- the empty space at the periphery of the polycarbonate sheet 5 is plugged by compensating shims 30, 31 consisting for example of thermosetting, polyester-methyl methacrylate composite, epoxy-glass fibers, ... capable of protecting the edge polycarbonate sheet, both mechanically and chemically.
- the projecting parts of the two modified acrylic sheets 1, 1 'and the compensating shims 30, 31 are drilled and suitable fastening means such as bolts are used. , nuts ... by screwing.
- suitable fastening means such as bolts are used.
- nuts ... by screwing In the holes drilled in the compensating shims 30, 31 are inserted stress recovery sleeves not shown to avoid crushing the modified acrylic sheets 1, 1 '.
- the aeronautical glazings according to the invention are perfectly suited for an aeronautical application, or even for all transport vehicles (terrestrial, aquatic or aerial) or even for buildings with a requirement security, burglar or anti-penetration. They are in particular excellent glazing aircraft or helicopters of all sizes, pinched, bolted and / or de-fogging and / or de-icing.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
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- Aviation & Aerospace Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1656060A FR3053277B1 (fr) | 2016-06-29 | 2016-06-29 | Vitrage aeronautique comprenant une feuille de polymere acrylique a proprietes mecaniques ameliorees |
PCT/FR2017/051658 WO2018002481A1 (fr) | 2016-06-29 | 2017-06-22 | Vitrage aeronautique comprenant une feuille de polymere acrylique a proprietes mecaniques ameliorees |
Publications (1)
Publication Number | Publication Date |
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EP3478500A1 true EP3478500A1 (fr) | 2019-05-08 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP17737003.8A Pending EP3478500A1 (fr) | 2016-06-29 | 2017-06-22 | Vitrage aeronautique comprenant une feuille de polymere acrylique a proprietes mecaniques ameliorees |
Country Status (9)
Country | Link |
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US (1) | US11052986B2 (fr) |
EP (1) | EP3478500A1 (fr) |
KR (1) | KR102359698B1 (fr) |
CN (1) | CN109311290B (fr) |
BR (1) | BR112018075787B1 (fr) |
CA (1) | CA3027874A1 (fr) |
FR (1) | FR3053277B1 (fr) |
RU (1) | RU2737368C2 (fr) |
WO (1) | WO2018002481A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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FR3099131B1 (fr) * | 2019-07-26 | 2021-09-03 | Saint Gobain | Hublot d’avion allégé à faible traînée |
FR3100155B1 (fr) * | 2019-08-30 | 2021-09-03 | Saint Gobain | Vitrage isolant chauffant a faible puissance et resistance mecanique elevee |
CN111923543A (zh) * | 2020-07-17 | 2020-11-13 | 中国航空工业集团公司沈阳飞机设计研究所 | 一种透明结构及其飞机座舱盖 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US5648149A (en) * | 1994-03-29 | 1997-07-15 | Ppg Industries, Inc. | Adhesion of thermoset polyurethane to rigid transparent substrates |
US20020110693A1 (en) * | 2000-12-14 | 2002-08-15 | Richard David A. | Glazing unit and method of making the same |
US7951310B2 (en) * | 2006-03-28 | 2011-05-31 | East China University Of Science And Technology | Nanophase carbon black grafted with organic compound in situ |
FR2936524B1 (fr) * | 2008-09-26 | 2010-09-24 | Arkema France | Article plat transparent a base de materiaux acryliques nanostructures |
CN101955572B (zh) * | 2009-12-15 | 2012-06-20 | 黄石理工学院 | 热压法制备改性纳米碳管和甲基丙烯酸甲酯复合材料的方法 |
US20120094084A1 (en) * | 2010-10-15 | 2012-04-19 | William Keith Fisher | Chemically-strengthened glass laminates |
FR2969633B1 (fr) * | 2010-12-23 | 2015-02-06 | Arkema France | Composition pour des plaques coulees nanostructurees reticulees |
FR2973803B1 (fr) * | 2011-04-07 | 2013-04-05 | Arkema France | Nouveau materiau acrylique renforce au choc |
FR3013508A1 (fr) * | 2013-11-21 | 2015-05-22 | Commissariat Energie Atomique | Module photovoltaique, et son procede de montage et de reparation |
-
2016
- 2016-06-29 FR FR1656060A patent/FR3053277B1/fr not_active Expired - Fee Related
-
2017
- 2017-06-22 BR BR112018075787-0A patent/BR112018075787B1/pt active IP Right Grant
- 2017-06-22 CA CA3027874A patent/CA3027874A1/fr active Pending
- 2017-06-22 RU RU2019100995A patent/RU2737368C2/ru active
- 2017-06-22 US US16/311,325 patent/US11052986B2/en active Active
- 2017-06-22 CN CN201780038179.1A patent/CN109311290B/zh active Active
- 2017-06-22 EP EP17737003.8A patent/EP3478500A1/fr active Pending
- 2017-06-22 WO PCT/FR2017/051658 patent/WO2018002481A1/fr unknown
- 2017-06-22 KR KR1020187036925A patent/KR102359698B1/ko active IP Right Grant
Also Published As
Publication number | Publication date |
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BR112018075787A2 (pt) | 2019-03-26 |
FR3053277B1 (fr) | 2020-11-06 |
CN109311290B (zh) | 2021-07-06 |
KR102359698B1 (ko) | 2022-02-10 |
US20190233078A1 (en) | 2019-08-01 |
FR3053277A1 (fr) | 2018-01-05 |
KR20190025563A (ko) | 2019-03-11 |
WO2018002481A1 (fr) | 2018-01-04 |
US11052986B2 (en) | 2021-07-06 |
CA3027874A1 (fr) | 2018-01-04 |
RU2019100995A3 (fr) | 2020-07-29 |
RU2737368C2 (ru) | 2020-11-27 |
CN109311290A (zh) | 2019-02-05 |
BR112018075787B1 (pt) | 2022-08-16 |
RU2019100995A (ru) | 2020-07-29 |
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