FR2943757A1 - Pipe useful in engine of motor vehicle for transport of fluid e.g. liquid, comprises a collection layer based of a polymer, a sub-adjacent internal layer made of same polymer of the collection layer, which comprises carbon nanopowders - Google Patents

Pipe useful in engine of motor vehicle for transport of fluid e.g. liquid, comprises a collection layer based of a polymer, a sub-adjacent internal layer made of same polymer of the collection layer, which comprises carbon nanopowders Download PDF

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Publication number
FR2943757A1
FR2943757A1 FR0951858A FR0951858A FR2943757A1 FR 2943757 A1 FR2943757 A1 FR 2943757A1 FR 0951858 A FR0951858 A FR 0951858A FR 0951858 A FR0951858 A FR 0951858A FR 2943757 A1 FR2943757 A1 FR 2943757A1
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France
Prior art keywords
polymer
covering layer
collection layer
pipe
layer
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.)
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Application number
FR0951858A
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French (fr)
Inventor
Didier Fromonteil
Joel Coutherut
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PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Priority to FR0951858A priority Critical patent/FR2943757A1/en
Publication of FR2943757A1 publication Critical patent/FR2943757A1/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00Hoses, i.e. flexible pipes
    • F16L11/04Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00Layered products having a general shape other than plane
    • B32B1/08Tubular products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00Layered products comprising a layer of natural or synthetic rubber
    • B32B25/10Layered products comprising a layer of natural or synthetic rubber next to a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/12Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/18Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/18Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/28Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/283Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/34Layered products comprising a layer of synthetic resin comprising polyamides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered 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
    • B32B5/02Layered 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
    • B32B5/024Woven fabric
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered 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
    • B32B5/02Layered 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
    • B32B5/028Net structure, e.g. spaced apart filaments bonded at the crossing points
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10Inorganic fibres
    • B32B2262/101Glass fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10Inorganic particles
    • B32B2264/107Ceramic
    • B32B2264/108Carbon, e.g. graphite particles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00Resin or rubber layer containing a blend of at least two different polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/30Properties of the layers or laminate having particular thermal properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/30Properties of the layers or laminate having particular thermal properties
    • B32B2307/304Insulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554Wear resistance
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00Tubular articles, e.g. hoses, pipes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00Vehicles

Abstract

The pipe (1) comprises a collection layer (5) based of a polymer, a sub-adjacent internal layer (4) made of same polymer of the collection layer. The collection layer comprises a charge comprising carbon nanopowders, has a concentration of 0.5-10 mass% and a thickness of lower than 4 mm, and is deposited by coating process, wetting, spraying or extrusion process.

Description

Tuyau comportant une couche de recouvrement Pipe with a covering layer

Domaine technique de l'invention La présente invention se rapporte à un tuyau pour le transport de fluide, par exemple du liquide de refroidissement d'un moteur. Plus particulièrement l'invention se rapporte à un tuyau comportant un moyen de protection thermique et/ou mécanique. TECHNICAL FIELD OF THE INVENTION The present invention relates to a pipe for the transport of fluid, for example the coolant of an engine. More particularly, the invention relates to a pipe comprising a thermal and / or mechanical protection means.

Arrière-plan technologique Dans le domaine automobile, les contraintes réglementaires actuelles (émissions polluantes, choc piéton...) conduisent à des solutions entraînant des températures sous capot moteur plus élevées. Technological background In the automotive field, current regulatory constraints (pollutant emissions, pedestrian impact, etc.) lead to solutions that lead to higher temperatures under the bonnet.

Dans le cas d'un tuyau de transport de fluide placé sous un capot moteur, le tuyau est exposé lors du fonctionnement du moteur, à des températures d'au moins 100°C et pouvant atteindre au moins 175°C. Un tel tuyau peut aussi entrer en contact avec des organes moteurs, tels qu'un couvre-culasse ou un radiateur, par l'intermédiaire desquels des vibrations du moteur sont transmises et risquent d'éroder le tuyau. In the case of a fluid transport hose under a bonnet, the hose is exposed during engine operation to temperatures of at least 100 ° C and up to at least 175 ° C. Such a hose may also come into contact with driving members, such as a cylinder head cover or a radiator, through which engine vibrations are transmitted and may erode the hose.

Il est connu de protéger la canalisation de ces contraintes au moyen de gaines de protection que l'on enfile sur la canalisation. It is known to protect the pipeline of these constraints by means of protective sheaths that are put on the pipe.

Ainsi pour la protection contre l'usure entre l'environnement moteur et le tuyau ce sont souvent des gaines de protection thermo-rétractable pouvant comprendre une tresse de fibres de polyester. Thus for the protection against wear between the engine environment and the pipe are often heat-shrinkable protective sheaths that may include a polyester fiber braid.

Pour la protection thermique, ce sont par exemple des gaines de protection métalliques (connues sous la dénomination commerciale Textalu chez Fédéral Mogul), composées d'aluminium collé sur une gaine extensible en fibre de verre tressée ou encore des gaines de protection en silicone chargée de fibre de verre. For the thermal protection, it is for example metal protective sheaths (known under the trade name Textalu Fédéral Mogul), composed of aluminum bonded to an extensible sheath of braided fiberglass or silicone protective sheaths loaded with fiberglass.

Il est connu du document FR2911380 une canalisation de transport de fluide comprenant au moins une couche de matériau plastique revêtue d'une couche de recouvrement en polyuréthane thermoplastique pour assurer une protection à la fois de l'abrasion et de la chaleur. Cependant, il nous est apparu par retour d'expérience que cette couche en polyuréthane thermoplastique est une protection insuffisante dès lors que l'on est confronté à des contraintes d'usure importante. Le document évoque par ailleurs le fait que la couche de recouvrement peut aussi renfermer des charges pour améliorer par exemple la tenue au feu ou à l'abrasion. Cependant rien n'est spécifié à propos du type de charge et classiquement il s'agit d'une charge minérale, ou une argile. It is known from FR2911380 a fluid transport pipe comprising at least one layer of plastic material coated with a thermoplastic polyurethane cover layer to provide protection for both abrasion and heat. However, it has come to our attention from experience that this layer of thermoplastic polyurethane is insufficient protection when we are confronted with significant wear constraints. The document also mentions the fact that the covering layer can also contain fillers to improve, for example, fire resistance or abrasion resistance. However nothing is specified about the type of charge and classically it is a mineral charge, or a clay.

L'invention a pour but de pallier l'inconvénient de l'art antérieur en proposant un tuyau disposant d'une protection thermique et mécanique améliorée. The invention aims to overcome the disadvantage of the prior art by providing a pipe having an improved thermal and mechanical protection.

L'invention a pour objet un tuyau comportant une couche de recouvrement à base de polymère, ladite couche de recouvrement comportant une charge, caractérisé en ce que la charge comprend des nanopoudres de carbone. En effet, les nanopoudres de carbone sont aptes à réaliser à eux seuls la double protection thermique et mécanique attendue. The subject of the invention is a pipe comprising a polymer-based covering layer, said covering layer comprising a filler, characterized in that the filler comprises carbon nanopowders. Indeed, the carbon nanopowders are able to achieve alone the double thermal and mechanical protection expected.

Par ailleurs, l'invention peut comporter l'une ou plusieurs des caractéristiques suivantes : -la charge a une concentration comprise sensiblement entre 0,5% et 10 % en masse de la couche de recouvrement, pour adapter le niveau de protection thermique et mécanique souhaité. Moreover, the invention may comprise one or more of the following characteristics: the filler has a concentration of substantially between 0.5% and 10% by weight of the covering layer, to adapt the level of thermal and mechanical protection wish.

-le polymère de la couche de recouvrement est choisi parmi : -le polyamide 66, 12, 11, 6-12, -le polypropylène, -un EPDM, -un polymère silicone, -un polymère acrylique, ou une combinaison desdits polymères. Ces polymères sont en effet aptes à résister à des environnements sollicités fortement mécaniquement et thermiquement. the polymer of the covering layer is chosen from: polyamide 66, 12, 11, 6-12, polypropylene, an EPDM, a silicone polymer, an acrylic polymer, or a combination of said polymers. These polymers are indeed able to withstand highly mechanically and thermally stressed environments.

-le tuyau comprend une couche interne sous-jacente à la couche de recouvrement réalisée dans un polymère identique à celui de la couche de recouvrement, pour permettre une bonne adhésion chimique entre ces deux couches. the pipe comprises an inner layer underlying the covering layer made of a polymer identical to that of the covering layer, to allow good chemical adhesion between these two layers.

-la couche de recouvrement a une épaisseur comprise sensiblement entre 0,05 mm et 4 mm, pour atteindre les objectifs de protection thermique et mécanique sans pénaliser l'encombrement. -la couche de recouvrement est déposée par un procédé d'enduction, de trempage ou de pulvérisation. Avantageusement, la couche de recouvrement a une épaisseur comprise35 entre 0,05 mm et 0,5 mm. En effet, cette famille de procédé est avantageuse pour réaliser les couches de recouvrement les plus fines. the covering layer has a thickness of substantially between 0.05 mm and 4 mm, to achieve the objectives of thermal and mechanical protection without penalizing the bulk. the covering layer is deposited by a coating, dipping or spraying process. Advantageously, the cover layer has a thickness of between 0.05 mm and 0.5 mm. Indeed, this family of processes is advantageous for producing the finest covering layers.

-la couche de recouvrement est déposée par un procédé d'extrusion. Avantageusement, la couche de recouvrement a une épaisseur inférieure ou égale à 4 mm. En effet, ce procédé est adapté à la réalisation de couche de recouvrement plus épaisses. the covering layer is deposited by an extrusion process. Advantageously, the covering layer has a thickness less than or equal to 4 mm. Indeed, this method is suitable for producing thicker covering layers.

Brève description des dessins D'autres particularités et avantages apparaîtront à la lecture de la description qui suit, non limitatif de l'invention, faite en référence à la figure schématique représentant un mode de réalisation du tuyau selon l'invention. BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages will become apparent on reading the following nonlimiting description of the invention, with reference to the schematic figure showing an embodiment of the pipe according to the invention.

- La figure 1 est une vue en perspective et partielle d'un exemple de réalisation d'un tuyau selon l'invention. - Figure 1 is a perspective view and partial of an embodiment of a pipe according to the invention.

Description détaillée Le tuyau 1 représenté sur la figure 1 pour le transport d'un fluide automobile tel que du liquide de refroidissement est composé : DETAILED DESCRIPTION The pipe 1 shown in FIG. 1 for the transport of an automotive fluid such as a cooling liquid is composed of:

- d'une première couche 2 interne de quelques millimètres d'épaisseur réalisée en un polymère souple tel que de l'EPDM (Éthylène Propylène Diène Monomère) ou un polymère silicone compatible avec le transport du liquide de refroidissement. - d'un tricot de renfort 3 composé par exemple de fibres de verre tressées. Le tricot permet d'augmenter la résistance à la pression et donc la valeur d'éclatement du tuyau 1, notamment en cas de température élevée. - d'une seconde couche interne 4 de quelques millimètres d'épaisseur réalisée le plus souvent dans le même polymère que celui utilisé pour la première couche interne 2. - d'une couche de recouvrement 5 réalisée dans un polymère. a first inner layer 2 of a few millimeters thick made of a flexible polymer such as EPDM (Ethylene Propylene Diene Monomer) or a silicone polymer compatible with the transport of the cooling liquid. - A reinforcing knit 3 composed for example of braided glass fibers. The knit makes it possible to increase the resistance to pressure and therefore the bursting value of the pipe 1, especially in the case of high temperature. a second inner layer 4 of a few millimeters thick, most often made of the same polymer as that used for the first inner layer 2. of a covering layer 5 made of a polymer.

De préférence, la couche de recouvrement 5 est réalisée dans un polymère identique à celui de utilisé pour la seconde couche interne 4 sous-jacente afin de se lier facilement à cette dernière par simple adhésion chimique. Conformément à l'invention, la couche de recouvrement 5 comporte une charge 6 comprenant des nanopoudres de carbone. On entend par nanopoudres de carbone des35 nanotubes de carbone ou du noir de carbone, les deux espèces pouvant être présentes dans la charge 6 de nanopoudres de carbone. En outre, on entend par noir de carbone des particules de carbone essentiellement sphériques de quelques dizaines à quelques centaines de nanomètres. Le mélange d'une charge 6 de carbone sous forme de nanopoudres de carbone dans la couche de recouvrement 5 permet d'améliorer à la fois la protection mécanique c'est-à-dire la tenue à l'usure du tuyau face à des contacts non continu et la protection thermique du tuyau en faisant office d'isolant thermique. 10 De préférence, la concentration de la charge 6 est sensiblement comprise entre 0,5 % et 10% en masse de la couche de recouvrement 5. Preferably, the cover layer 5 is made of a polymer identical to that used for the second inner layer 4 underlying to easily bind to the latter by simple chemical adhesion. According to the invention, the covering layer 5 comprises a filler 6 comprising carbon nanopowders. By carbon nanopowders are meant carbon nanotubes or carbon black, the two species being able to be present in the charge 6 of carbon nanopowders. In addition, carbon black is understood to mean essentially spherical carbon particles of a few tens to a few hundred nanometers. The mixture of a carbon filler 6 in the form of carbon nanopowders in the covering layer 5 makes it possible to improve both the mechanical protection that is to say the resistance to wear of the pipe facing contacts. non-continuous and thermal protection of the pipe acting as thermal insulation. Preferably, the concentration of the filler 6 is substantially between 0.5% and 10% by weight of the covering layer 5.

De préférence aussi, la couche de recouvrement 5 à une épaisseur comprise entre 0,05 15 mm et 4 mm. Also preferably, the covering layer 5 has a thickness of between 0.05 mm and 4 mm.

Cependant, le choix précis de l'épaisseur de la couche de recouvrement est défini selon la protection mécanique et / ou la protection thermique souhaitée. However, the precise choice of the thickness of the covering layer is defined according to the mechanical protection and / or the desired thermal protection.

20 En effet, dans le cas d'une application où la protection souhaitée est purement une protection mécanique une épaisseur couche de recouvrement 5 mince est suffisante pour abaisser le coefficient de frottement et rendre le tuyau 1 moins sensible à l'usure par contact non continu avec des éléments extérieurs. Avantageusement, l'épaisseur de la couche de recouvrement 5 est alors comprise par exemple entre 0,05 mm et 0,5 mm. 25 En revanche, quand la protection souhaitée est essentiellement thermique l'épaisseur de la couche de recouvrement 5 nécessaire pour isoler thermiquement le fluide traversant l'intérieur du tuyau 1 est plus importante. Avantageusement l'épaisseur de la couche de recouvrement 5 est alors comprise par exemple entre 1 mm et 4 mm. 30 Le tuyau 1 selon l'invention est réalisé simplement, par exemple, par un procédé d'extrusion de la première couche interne 2, enfilage du tricot 3, extrusion de la seconde couche interne 4. Le mélange entre le polymère et la charge 6 en nanotubes et/ou noir de carbone ayant a été préparé à l'avance, de préférence, la couche de recouvrement 5 est 35 alors déposée sur la seconde couche interne 4 par un procédé d'extrusion.5 De préférence, le procédé d'extrusion est utilisé pour réaliser une couche de recouvrement d'épaisseur inférieure ou égale à 4mm. Indeed, in the case of an application where the desired protection is purely a mechanical protection a thin cover layer thickness 5 is sufficient to lower the coefficient of friction and make the pipe 1 less susceptible to non-continuous contact wear. with external elements. Advantageously, the thickness of the covering layer 5 is then, for example, between 0.05 mm and 0.5 mm. On the other hand, when the desired protection is essentially thermal, the thickness of the covering layer 5 necessary to thermally isolate the fluid passing through the inside of the pipe 1 is greater. Advantageously, the thickness of the covering layer 5 is then for example between 1 mm and 4 mm. The pipe 1 according to the invention is produced simply, for example, by an extrusion process of the first inner layer 2, threading of the knit 3, extrusion of the second inner layer 4. The mixture between the polymer and the filler 6 Preferably, the carbon nanotube and / or carbon black layer having been prepared in advance, the cover layer 5 is then deposited on the second inner layer 4 by an extrusion process. extrusion is used to make a covering layer of thickness less than or equal to 4mm.

De plus, l'invention ne se limite pas au mode de réalisation décrit en figure 1. Selon une variante, l'invention, selon son principe, convient pour assurer, selon les besoins, la protection thermique et/ou mécanique des tuyaux polymères réalisés en monocouche interne ou en multicouche interne, avec ou sans tricot de renfort, dans des polymères tels que à titre indicatif, le polypropylène (PP), le polyamide 12, le polyamide 11, le polyamide 6-12, le polyamide 66, un EPDM, un polymère silicone, un polymère acrylique seuls ou en combinaison. Ces tuyaux peuvent être destinés à transporter d'autres fluides tels que du carburant, de l'huile. In addition, the invention is not limited to the embodiment described in FIG. 1. According to one variant, the invention, according to its principle, is suitable for ensuring, as required, the thermal and / or mechanical protection of the polymer pipes produced. in internal monolayer or in internal multilayer, with or without reinforcing knit, in polymers such as indicative, polypropylene (PP), polyamide 12, polyamide 11, polyamide 6-12, polyamide 66, EPDM , a silicone polymer, an acrylic polymer alone or in combination. These pipes can be intended to carry other fluids such as fuel, oil.

Dans une variante, la couche de recouvrement est dans un polymère différent de celui de la couche interne sous-jacente. Toutefois, dans cette configuration, il faut s'assurer de la bonne adhérence de la couche de recouvrement avec la couche interne sous-jacente. In a variant, the covering layer is in a polymer different from that of the underlying inner layer. However, in this configuration, it is necessary to ensure the good adhesion of the covering layer with the underlying inner layer.

Selon une autre variante, pour des épaisseurs de recouvrement plus fines, comprises de préférence entre 0,05 mm et 0,5 mm, la couche de recouvrement 5 est de préférence appliquée par un procédé d'enduction, de trempage ou par pulvérisation. La charge 6 est dans ce cas mélangée à un liant polymère apte à former après enduction, trempage ou pulvérisation, un film polymère sur la couche sous-jacente According to another variant, for thinner covering thicknesses, preferably between 0.05 mm and 0.5 mm, the covering layer 5 is preferably applied by a coating process, dipping or spraying. The filler 6 is in this case mixed with a polymeric binder capable of forming, after coating, dipping or spraying, a polymer film on the underlying layer

L'invention a pour avantage de limiter et /ou de contrôler l'usure du tuyau revêtue dans le cas d'un contact non permanent tel que, en application automobile, un contact occasionnel avec un carter fonte ou aluminium. The invention has the advantage of limiting and / or controlling the wear of the coated pipe in the case of non-permanent contact such as, in automotive application, occasional contact with a cast iron or aluminum housing.

L'invention a encore pour avantage de supprimer une étape de montage sur le tuyau d'une gaine de protection, opération manuelle et donc coûteuse, puisque le tuyau selon l'invention est déjà par construction, revêtue de sa couche de protection. En permettant la suppression gaines de protections traditionnelles, l'invention permet une réduction d'encombrement, ce qui est particulièrement avantageux pour des applications automobiles où l'environnement sous capot moteur est très compacté.30 The invention also has the advantage of eliminating a mounting step on the pipe of a protective sheath, manual operation and therefore expensive, since the pipe according to the invention is already by construction, coated with its protective layer. By allowing the removal of sheaths of traditional protections, the invention allows a reduction in size, which is particularly advantageous for automotive applications where the environment under the engine hood is very compacted.

Claims (9)

Revendications1. Tuyau comportant une couche de recouvrement (5) à base de polymère, ladite couche de recouvrement (5) comportant une charge (6), caractérisé en ce que la charge (6) comprend des nanopoudres de carbone. Revendications1. Pipe comprising a polymer-based covering layer (5), said covering layer (5) comprising a filler (6), characterized in that the filler (6) comprises carbon nanopowders. 2. Tuyau selon la revendication 1, caractérisé en ce que la charge (6) a une concentration comprise sensiblement entre 0,5% et 10 % en masse de la couche de recouvrement (5). 2. Pipe according to claim 1, characterized in that the filler (6) has a concentration of substantially between 0.5% and 10% by weight of the covering layer (5). 3. Tuyau selon la revendication 1 ou la revendication 2, caractérisé en ce le polymère de la couche de recouvrement (5) est choisi parmi : -le polyamide 66, 12, 11, 6-12, -le polypropylène, -un EPDM, -un polymère silicone, -un polymère acrylique, ou une combinaison desdits polymères. Pipe according to Claim 1 or Claim 2, characterized in that the polymer of the covering layer (5) is chosen from: polyamide 66, 12, 11, 6-12, polypropylene, an EPDM, a silicone polymer, an acrylic polymer, or a combination of said polymers. 4. Tuyau selon l'une des revendications 1 à 3, caractérisé en ce qu'il comprend une couche interne (4) sous-jacente à la couche de recouvrement (5) réalisée dans un polymère identique à celui de la couche de recouvrement (5). 4. Pipe according to one of claims 1 to 3, characterized in that it comprises an inner layer (4) underlying the covering layer (5) made of a polymer identical to that of the covering layer ( 5). 5. Tuyau selon l'une des revendications 1 à 4, caractérisé en ce que la couche de recouvrement (5) a une épaisseur comprise sensiblement entre 0,05 mm et 4 mm. 5. Pipe according to one of claims 1 to 4, characterized in that the covering layer (5) has a thickness between substantially 0.05 mm and 4 mm. 6. Tuyau selon l'une des revendications 1 à 5, caractérisé en ce que la couche de recouvrement (5) est déposée par un procédé d'enduction, de trempage ou de pulvérisation. 6. Pipe according to one of claims 1 to 5, characterized in that the covering layer (5) is deposited by a coating process, dipping or spraying. 7. Tuyau selon la revendication 6, caractérisé en ce que la couche de recouvrement (5) a une épaisseur comprise entre 0,05 mm et 0,5 mm. 7. Pipe according to claim 6, characterized in that the covering layer (5) has a thickness between 0.05 mm and 0.5 mm. 8. Tuyau selon l'une des revendications 1 à 5, caractérisé en ce que la couche de recouvrement (5) est déposée par un procédé d'extrusion. 8. Pipe according to one of claims 1 to 5, characterized in that the covering layer (5) is deposited by an extrusion process. 9. Tuyau selon la revendication 8, caractérisé en ce que la couche de recouvrement (5) a une épaisseur inférieure ou égale à 4 mm.30 Pipe according to Claim 8, characterized in that the covering layer (5) has a thickness of less than or equal to 4 mm.
FR0951858A 2009-03-24 2009-03-24 Pipe useful in engine of motor vehicle for transport of fluid e.g. liquid, comprises a collection layer based of a polymer, a sub-adjacent internal layer made of same polymer of the collection layer, which comprises carbon nanopowders Withdrawn FR2943757A1 (en)

Priority Applications (1)

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FR0951858A FR2943757A1 (en) 2009-03-24 2009-03-24 Pipe useful in engine of motor vehicle for transport of fluid e.g. liquid, comprises a collection layer based of a polymer, a sub-adjacent internal layer made of same polymer of the collection layer, which comprises carbon nanopowders

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FR0951858A FR2943757A1 (en) 2009-03-24 2009-03-24 Pipe useful in engine of motor vehicle for transport of fluid e.g. liquid, comprises a collection layer based of a polymer, a sub-adjacent internal layer made of same polymer of the collection layer, which comprises carbon nanopowders

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FR0951858A Withdrawn FR2943757A1 (en) 2009-03-24 2009-03-24 Pipe useful in engine of motor vehicle for transport of fluid e.g. liquid, comprises a collection layer based of a polymer, a sub-adjacent internal layer made of same polymer of the collection layer, which comprises carbon nanopowders

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050067035A1 (en) * 2003-09-30 2005-03-31 Tokai Rubber Industries, Ltd. Automotive fuel hose
US20050131147A1 (en) * 2003-02-18 2005-06-16 Benoit Brule Polyamide/polyolefin blends containing carbon nanotubes
US20060086402A1 (en) * 2004-10-25 2006-04-27 Sanoh Kogyo Kabushiki Kaisha Multilayer resin pipe
FR2911380A1 (en) * 2007-01-17 2008-07-18 Coutier Moulage Gen Ind Pipe for transport of fluid e.g. motor vehicle fuel, comprises first internal layer covering second layer, third layer electrically conductive at interior of the first layer, reinforcement lattice, and scheduled final collection layer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050131147A1 (en) * 2003-02-18 2005-06-16 Benoit Brule Polyamide/polyolefin blends containing carbon nanotubes
US20050067035A1 (en) * 2003-09-30 2005-03-31 Tokai Rubber Industries, Ltd. Automotive fuel hose
US20060086402A1 (en) * 2004-10-25 2006-04-27 Sanoh Kogyo Kabushiki Kaisha Multilayer resin pipe
FR2911380A1 (en) * 2007-01-17 2008-07-18 Coutier Moulage Gen Ind Pipe for transport of fluid e.g. motor vehicle fuel, comprises first internal layer covering second layer, third layer electrically conductive at interior of the first layer, reinforcement lattice, and scheduled final collection layer

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