FR2707724A1 - Multilayer plastic pipe - Google Patents

Multilayer plastic pipe Download PDF

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Publication number
FR2707724A1
FR2707724A1 FR9308689A FR9308689A FR2707724A1 FR 2707724 A1 FR2707724 A1 FR 2707724A1 FR 9308689 A FR9308689 A FR 9308689A FR 9308689 A FR9308689 A FR 9308689A FR 2707724 A1 FR2707724 A1 FR 2707724A1
Authority
FR
France
Prior art keywords
layer
polyethylene
polyester
tube according
pipe
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.)
Withdrawn
Application number
FR9308689A
Other languages
French (fr)
Inventor
Douchet Jean-Claude
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nobel Plastiques SA
Original Assignee
Nobel Plastiques SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nobel Plastiques SA filed Critical Nobel Plastiques SA
Priority to FR9308689A priority Critical patent/FR2707724A1/en
Publication of FR2707724A1 publication Critical patent/FR2707724A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered 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
    • B32B27/08—Layered 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
    • 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
    • B32B1/00—Layered products having a general shape other than plane
    • B32B1/08—Tubular products
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/125—Rigid pipes of plastics with or without reinforcement electrically conducting
    • 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
    • B32B2305/72—Cured, e.g. vulcanised, cross-linked
    • 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
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21—Anti-static
    • 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
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/043—HDPE, i.e. high density polyethylene
    • 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
    • B32B2597/00—Tubular articles, e.g. hoses, pipes

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)

Abstract

Pipe made of synthetic material having several layers, manufactured by coextrusion and intended to convey a motor-vehicle fuel, comprising, from the inside outwards, a layer made of polyethylene, an adhesive layer made of a copolymer of polyethylene, acrylic acid and/or maleic anhydride, and an outer layer made of polyester.

Description

La présente invention concerne une canalisation en matière plastique pour des fluides existant dans les véhicules automobiles tels que le carburant ou le liquide laveglace, le liquide de refroidissement du moteur voire le liquide caloporteur pour l'installation de chauffage-climatisation. The present invention relates to a plastic pipe for fluids existing in motor vehicles such as fuel or windshield washer fluid, engine coolant or even coolant for the heating-air conditioning system.

Les canalisations aujourd'hui utilisées, lorsqu'elles ne sont plus métalliques, sont essentiellement en polyamide. Ce matériau présente un certain nombre d'inconvénients, notamment du fait de l'alcool qui est nécessairement présent dans les fluides véhiculés. En effet, l'alcool à pour premier effet de faire gonfler le matériau ce qui détruit ses caractéristiques dimensionnelles et conduit à des pertes d'étanchéité ou des contraintes inadmissibles dans les tuyauteries. En outre, l'alcool dissout certains des composants de la conduite et les entraîne dans le reste de l'installation où ils sont une cause d'encrassement. The pipes used today, when they are no longer metallic, are essentially made of polyamide. This material has a number of drawbacks, in particular due to the alcohol which is necessarily present in the fluids conveyed. In fact, alcohol has the primary effect of causing the material to swell, which destroys its dimensional characteristics and leads to losses of tightness or unacceptable stresses in the pipes. In addition, the alcohol dissolves some of the components of the pipe and leads them to the rest of the installation where they are a cause of fouling.

Pour combattre cet inconvénient on a proposé de revêtir la paroi intérieure de ces canalisations d'une couche barrière fine par exemple en polyoléfine (polypropylène notamment) par coextrusion. To combat this drawback, it has been proposed to coat the inner wall of these pipes with a thin barrier layer, for example made of polyolefin (especially polypropylene) by coextrusion.

Dans d'autres techniques on a également proposé de revêtir la face interne de cette canalisation d'un EVOH (copolymère d'éthylène alcool vinylique) pour la propriété bien connue de ces corps à former une barrière efficace notamment aux solvants organiques. Cependant en présence d'alcool les EVOH ont une tendance à retenir cet alcool et surtout le méthanol. In other techniques, it has also been proposed to coat the internal face of this pipe with an EVOH (ethylene vinyl alcohol copolymer) for the well-known property of these bodies to form an effective barrier, in particular to organic solvents. However in the presence of alcohol EVOHs have a tendency to retain this alcohol and especially methanol.

On a également décrit des produits dans lesquels cette couche est prise en sandwich entre un polyamide épais extérieur et un polyamide fin intérieur. We have also described products in which this layer is sandwiched between a thick outer polyamide and a thin inner polyamide.

Dans le domaine des réservoirs de carburant, des travaux concernent l'utilisation de polyéthylène qui est un matériau neutre offrant une bonne résistance à l'alcool. Pour encore améliorer l'étanchéité aux vapeurs, on traite la surface interne de la paraison pour y déposer une fine couche de silice ou de fluor. Cette technique semble donner satisfaction mais reste aujourd'hui onéreuse pour une application à la réalisation de conduites qui, par ailleurs, doivent présenter d'autres caractéristiques notamment en ce qui concerne la tenue mécanique et la tenue au gravillonnage. In the field of fuel tanks, work concerns the use of polyethylene which is a neutral material offering good resistance to alcohol. To further improve vapor tightness, the internal surface of the parison is treated to deposit a thin layer of silica or fluorine there. This technique seems to give satisfaction but remains expensive today for an application to the production of pipes which, moreover, must have other characteristics in particular with regard to mechanical strength and resistance to graveling.

La présente invention entend proposer une autre composition de canalisation apte à véhiculer un liquide contenant de l'alcool. Ce liquide peut être du carburant qui contient un alcool additionnel pour diminuer son pouvoir d'auto-inflammation en remplacement du plomb aujourd'hui proscrit. Ce liquide peut également être le liquide laveglace voire le liquide de refroidissement qui peut comporter jusqu'à 50 % de glycol. The present invention intends to propose another pipe composition capable of conveying a liquid containing alcohol. This liquid can be fuel which contains an additional alcohol to reduce its auto-ignition power in place of the lead nowadays prohibited. This liquid can also be the windshield washer fluid or even the coolant which can contain up to 50% glycol.

A cet effet l'invention a donc pour objet un tube en matière synthétique à plusieurs couches, fabriqué par coextrusion destiné à véhiculer un carburant de véhicule automobile qui comporte, de l'intérieur vers l'extérieur, une couche en polyéthylène haute densité, une couche d'adhésif copolymère de polyéthylène, d'acide acrylique et/ou d'anhydride maléique, et une couche extérieure en polyester. To this end, the subject of the invention is therefore a multi-layer plastic tube, manufactured by coextrusion intended to convey a motor vehicle fuel which comprises, from inside to outside, a layer of high density polyethylene, a layer of copolymer adhesive of polyethylene, acrylic acid and / or maleic anhydride, and an outer layer of polyester.

L'utilisation du polyéthylène haute densité est avantageuse car elle constitue une excellente barrière aux alcools et ce de manière peu coûteuse. C'est en effet un matériau neutre beaucoup plus cristallisé que le polyéthylène basse densité, offrant donc naturellement une structure plus compacte dont le franchissement par les molécules d'alcool et d'hydrocarbure est plus difficile. En outre le polyéthylène haute densité présente l'avantage d'une bonne soudabilité pour réaliser soit des cloisonnements à l'intérieur de la canalisation, soit un raccordement avec un dispositif de connexion à rapporter en extrémité de canalisation. A ce propos, on indiquera qu'une épaisseur avantageuse de cette couche intérieure sera de l'ordre de 0,4 à 0,8 millimètre pour que l'assemblage par soudure à des cloisonnements internes ou à un dispositif de connexion en extrémité soit possible. The use of high density polyethylene is advantageous because it constitutes an excellent barrier to alcohols and this in an inexpensive manner. It is indeed a neutral material much more crystallized than low density polyethylene, thus naturally offering a more compact structure whose crossing by alcohol and hydrocarbon molecules is more difficult. In addition, high density polyethylene has the advantage of good weldability for making either partitions inside the pipe, or a connection with a connection device to be attached at the end of the pipe. In this regard, it will be indicated that an advantageous thickness of this inner layer will be of the order of 0.4 to 0.8 millimeters so that assembly by welding to internal partitions or to a connection device at the end is possible. .

L'adhésion du polyéthylène haute densité (PEHD) à la couche extérieure de polyester est réalisée par un copolymère polyéthylène, acide acrylique ou anhydride maléique coextrudé avec la couche intérieure et sur une épaisseur de l'ordre de 0,2 mm. The adhesion of high density polyethylene (HDPE) to the outer polyester layer is carried out by a polyethylene, acrylic acid or maleic anhydride copolymer coextruded with the inner layer and over a thickness of the order of 0.2 mm.

Enfin la couche extérieure en polyester est utilisée essentiellement pour sa fonction barrière aux hydrocarbures et comme renforcement mécanique et résistant aux agressions abrasives et par chocs du gravillonnage. Finally, the polyester outer layer is mainly used for its barrier function to hydrocarbons and as a mechanical reinforcement and resistant to abrasive aggressions and by gravel shock.

On utilisera de préférence un polyester thermoplastique, tel par exemple que celui commercialisé sous la denomination ARNITEL (marque déposée de la société Dutch
States Mines), ou celui commercialisé sous la dénomination
HYTREL (marque déposée de la société Du Pont de Nemours).Preferably use a thermoplastic polyester, such as for example that marketed under the name ARNITEL (registered trademark of the company Dutch
States Mines), or that marketed under the name
HYTREL (registered trademark of the company Du Pont de Nemours).

La conduite ainsi obtenue présente trois couches coextrudées
- une couche de PEHD sur 0,4 à 0,8 millimètre d'épaisseur,
- une couche adhésive de copolymère polyéthylène, acide acrylique et/ou anhydride maléique sur environ 0,2 millimètre d'épaisseur,
- une couche de polyester de 0,3 à 0,5 millimètre d'épaisseur, ce qui est nettement inférieur aux conduites en polyester en mono couche qui ont une couche externe beaucoup plus épaisse (de tordre de 1 mm).The pipe thus obtained has three coextruded layers
- a layer of HDPE 0.4 to 0.8 millimeters thick,
- an adhesive layer of polyethylene, acrylic acid and / or maleic anhydride copolymer over a thickness of approximately 0.2 millimeters,
- a polyester layer 0.3 to 0.5 millimeters thick, which is significantly lower than single-layer polyester pipes which have a much thicker outer layer (twist 1 mm).

Ce produit est de coût moins élevé que les produits connus aujourd'hui tout en présentant des caractéristiques élevées de résistance et d'imperméabilité. En effet la réalisation de la fonction barrière au carburant par deux matériaux permet d'utiliser des matériaux moins coûteux au total qu'un matériau assurant seul la barrière aux alcools et hydrocarbures. This product is of lower cost than the products known today while having high characteristics of resistance and impermeability. Indeed, the realization of the fuel barrier function by two materials makes it possible to use materials which are less expensive in total than a material which alone provides the barrier to alcohols and hydrocarbons.

Par ailleurs, le choix d'un polyéthylène comme couche interne est intéressant du fait de sa capacité à être chargé en matériau pulvérulent et notamment en graphite. La couche interne peut alors devenir conductrice et constituer une protection contre les charges électriques statiques de la conduite. Furthermore, the choice of a polyethylene as an internal layer is advantageous because of its capacity to be loaded with pulverulent material and in particular graphite. The inner layer can then become conductive and provide protection against static electrical charges in the pipe.

Dans une seconde réalisation de l'invention, la couche interne est en polyéthylène haute densité réticulé. In a second embodiment of the invention, the internal layer is made of crosslinked high density polyethylene.

Ainsi, la conduite est réalisée en trois couches coextrudées, dont la couche interne est en polyéthylène réticulable dans les épaisseurs susdites puis l'ensemble (ou au moins la paroi intérieure) est soumise à un traitement à l'eau ou à la vapeur qui provoque la réticulation du polyéthylène. La conduite voit alors sa tenue à la température et son imperméabilité aux hydrocarbures et à l'alcool améliorées. Une telle canalisation trouve une application particulièrement avantageuse dans le circuit de refroidissement par eau du moteur du véhicule où les températures sont voisines de 1000C-150"C. En outre, l'opération de réticulation peut être réalisée alors que la conduite est maintenue en forme. Le produit final est alors sensiblement figé dans cette forme. Thus, the pipe is made in three coextruded layers, the inner layer of which is made of crosslinkable polyethylene in the above-mentioned thicknesses, then the assembly (or at least the inner wall) is subjected to a treatment with water or steam which causes crosslinking of polyethylene. The pipe then sees its resistance to temperature and its impermeability to hydrocarbons and alcohol improved. Such a pipe finds a particularly advantageous application in the water cooling circuit of the vehicle engine where the temperatures are close to 1000C-150 "C. In addition, the crosslinking operation can be carried out while the pipe is kept in shape The final product is then substantially frozen in this form.

Claims (5)

REVENDICATIONS 1. Tube en matière synthétique à plusieurs couches fabriqué par coextrusion destiné à véhiculer un carburant de véhicule automobile, caractérisé en ce qu'il comporte, de l'intérieur vers l'extérieur, une couche en polyéthylène haute densité, une couche d'adhésif copolymère de polyéthylène, d'acide acrylique et/ou d'anhydride maléique, et une couche extérieure en polyester. 1. Multilayer plastic tube manufactured by coextrusion intended to convey a motor vehicle fuel, characterized in that it comprises, from the inside to the outside, a layer of high density polyethylene, a layer of adhesive copolymer of polyethylene, acrylic acid and / or maleic anhydride, and an outer layer of polyester. 2. Tube selon la revendication 1, caractérisé en ce que le polyéthylène haute densité est réticulé. 2. Tube according to claim 1, characterized in that the high density polyethylene is crosslinked. 3. Tube selon la revendication 1, caractérisé en ce que le polyester est thermoplastique. 3. Tube according to claim 1, characterized in that the polyester is thermoplastic. 4. Tube selon l'une des revendications 1 à 3, caractérisé en ce que les épaisseurs des couches sont 4. Tube according to one of claims 1 to 3, characterized in that the thicknesses of the layers are - 0,4 - 0,8 mm pour la couche de polyéthylène, - 0.4 - 0.8 mm for the polyethylene layer, - 0,2 mm pour la couche d'adhésif, - 0.2 mm for the adhesive layer, - 0,3 - 0,5 mm pour la couche de polyester. - 0.3 - 0.5 mm for the polyester layer. 5. Tube selon l'une des revendications précédentes, caractérisé en ce que la couche interne est en polyéthylène chargé d'un matériau pulvérulent électriquement conducteur formant ainsi couche anti-statique.  5. Tube according to one of the preceding claims, characterized in that the internal layer is made of polyethylene loaded with an electrically conductive powder material thus forming an anti-static layer.
FR9308689A 1993-07-15 1993-07-15 Multilayer plastic pipe Withdrawn FR2707724A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9308689A FR2707724A1 (en) 1993-07-15 1993-07-15 Multilayer plastic pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9308689A FR2707724A1 (en) 1993-07-15 1993-07-15 Multilayer plastic pipe

Publications (1)

Publication Number Publication Date
FR2707724A1 true FR2707724A1 (en) 1995-01-20

Family

ID=9449264

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9308689A Withdrawn FR2707724A1 (en) 1993-07-15 1993-07-15 Multilayer plastic pipe

Country Status (1)

Country Link
FR (1) FR2707724A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2812929A1 (en) * 2000-08-11 2002-02-15 Nobel Plastiques Plastic tube for fluids, e.g. fuels, used in motor vehicles, has multi-layer structure of different polymers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2812929A1 (en) * 2000-08-11 2002-02-15 Nobel Plastiques Plastic tube for fluids, e.g. fuels, used in motor vehicles, has multi-layer structure of different polymers
WO2002014727A1 (en) * 2000-08-11 2002-02-21 Nobel Plastiques Multilayer plastic tube for fluids used in motor vehicles

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