WO2013113555A1 - Conduite de carburant munie d'au moins une couche de polyoxyméthylène - Google Patents

Conduite de carburant munie d'au moins une couche de polyoxyméthylène Download PDF

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Publication number
WO2013113555A1
WO2013113555A1 PCT/EP2013/050729 EP2013050729W WO2013113555A1 WO 2013113555 A1 WO2013113555 A1 WO 2013113555A1 EP 2013050729 W EP2013050729 W EP 2013050729W WO 2013113555 A1 WO2013113555 A1 WO 2013113555A1
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WO
WIPO (PCT)
Prior art keywords
range
layer
polyoxymethylene
fuel
fuel line
Prior art date
Application number
PCT/EP2013/050729
Other languages
German (de)
English (en)
Inventor
Marc Van Hooren
Wilfried ZÜLCH
Patrick Hessberger
Burkhard Wirth
Manuela Rether
Original Assignee
Veritas Ag
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 Veritas Ag filed Critical Veritas Ag
Priority to EP13700311.7A priority Critical patent/EP2809723A1/fr
Publication of WO2013113555A1 publication Critical patent/WO2013113555A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L59/00—Compositions of polyacetals; Compositions of derivatives of polyacetals
    • C08L59/04—Copolyoxymethylenes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/64—Screws with two or more threads
    • B29C48/65—Screws with two or more threads neighbouring threads or channels having different configurations, e.g. one thread being lower than its neighbouring thread
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/002—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor characterised by the choice of material
    • 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 non-planar shape
    • 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
    • B32B27/06—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
    • 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
    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/285—Layered 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 polyethers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0017—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor related to fuel pipes or their connections, e.g. joints or sealings
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/06—Hoses, i.e. flexible pipes made of rubber or flexible plastics with homogeneous wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92209—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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

Definitions

  • the invention relates to a fuel line, in particular fuel line for motor vehicles and an arrangement comprising such a fuel line, a connected to the fuel line connector and / or a fuel tank.
  • a service line is a line specially designed for these supplies.
  • the line is preferably designed diffusion-tight with respect to the promoted in the line fuel.
  • Prior art in plastic pipes and fittings for e.g. Tank applications form components made of polyamide (PA), in particular PA 12.
  • PA polyamide
  • the invention has the object of providing a fuel line for motor vehicles while avoiding the disadvantages of the known fuel lines made of PA 12 ready to provide.
  • the invention provides the fuel line, in particular fuel line for motor vehicles, according to claim 1, wherein the fuel line comprises at least one layer of polyoxymethylene.
  • Polyoxymethylene POM is also known as polyacetal, polyformaldehyde (for short-chain molecules) or polytrioxane.
  • the said layer with polyoxymethylene is preferably more than 50% by weight, preferably more than 75% by weight, preferably 100% by weight, of polyoxymethylene.
  • the layer may contain modifications of polyoxymethylene and / or a blend of polyoxymethylene, in particular a blend with polyurethane elastomers.
  • the invention particularly relates to a flexible, oligomer-free polyoxymethylene (POM) fuel line, for use in tank applications or for low-temperature applications, consisting of flexible POM tubes, which are used in particular in connection with fittings or quick couplings or connectors made of POM.
  • POM polyoxymethylene
  • the at least one layer with polyoxymethylene forms the inner layer and / or the outer layer of the working fluid line, wherein the fuel line is preferably designed as a single layer.
  • the material polyoxymethylene is characterized by low fuel permeability and gasoline vapor permeability, these properties can be further improved by modification and / or application of aggregates.
  • the polyoxymethylene layer for the inner layer and / or the outer layer, the fuel permeability and gasoline vapor permeability of the fuel line can be minimized.
  • polyoxymethylene is chemically modified, preferably by grafting and / or copolymerization.
  • polymer modification of the polyoxymethylene the properties of the at least one layer with polyoxymethylene and ultimately the working fluid line can be adjusted and optimized for the respective application.
  • Polyoxymethylene is known from automotive tank construction. There are components in the form of pump housings. Due to its material properties, in particular due to its stiffness and insufficient elongation properties, polyoxymethylene has not been used for the production of fuel lines. By modifying the material properties can be adjusted so that a flexible fuel line for motor vehicles made of polyoxymethylene or from a polyoxymethylene-based material can be produced.
  • the modification can be effected by blending or grafting (copolymerization) by means of polyether, polyetherester, TPE's, in particular TPU's, whereby a direct chemical attachment to the matrix polymer or to the polymer main chain of polyoxymethylene is advantageous compared to a blend production because the risk of detachment or extraction from the matrix is reduced by an operating or fuel.
  • the at least one layer with polyoxymethylene has a polyoxyethylene copolymer having the structure - [(CH 2 -O) n - (CH 2 -CH 2 -O) m ] - or more than 50 percent by weight, preferably is greater than 75 percent by weight, preferably 100 percent by weight, of the polyoxymethylene copolymer, preferably wherein the polyoxymethylene copolymer is copolymerized with cyclic ethers and / or the end groups are blocked.
  • Advantageous applications of the fuel line arise in particular by impact modification of the polyoxymethylene, which is achieved, for example, by copolymerization and / or blocking of the end groups. As a result, the fuel line is characterized even at low Temperature applications by excellent flexibility and low temperature impact strength or impact strength.
  • the at least one layer of polyoxymethylene comprises at least one of the following additives:
  • At least one functional additive preferably selected from the group of ethers, phenols, amines, nitrogen compounds and / or salts, in particular salts of carboxylic acids, preferably cyclic ethers, sterically hindered phenols and / or sterically hindered amines and / or calcium stearate.
  • At least one colorant preferably pigments and / or carbon black and / or UV absorbers.
  • At least one filler preferably selected from carbon black (active types), molybdenum disulfide, chalk, wax, oil, oil concentrate, carbon nanotubes (CNT), fluoroplastic and / or metal powder, preferably silicone oil concentrate, PVDF, ETFE, FEP, THV, PVF , PVDF, aluminum powder and / or bronze powder.
  • the mechanical properties of the at least one layer with polyoxymethylene or the fuel line can be further improved and tailored to the particular application.
  • the addition of the additives depends u. a. also from the layer structure of the fuel line.
  • the layer with polyoxymethylene must assume both mechanical (strength) and chemical (fuel-tightness) functions and be designed accordingly.
  • a filler such as carbon black (active types) and / or carbon nanotubes (CNT)
  • the fuel line can be performed antistatic or conductive.
  • the at least one layer with polyoxymethylene has at least one of the following properties:
  • the layer is flexible.
  • the layer is extruded.
  • the layer has a constant inner cross section and / or outer cross section.
  • the layer is formed as a smooth tube.
  • the inner diameter is in the range of 3 to 20 mm, preferably in the range of 5 to 15 mm, preferably in the range of 8 to 12 mm.
  • the wall thickness is in the range of 0.1 to 5 mm, preferably in the range of 0.2 to 2 mm, preferably in the range of 0.5 to 1, 5 mm.
  • the density is in the range of 1.2 to 1.5 g / cm 3 , preferably in the range of 1.3 to 1.4 g / cm 3 , preferably in the range of 1.3 to 1.35 g / cm 3 . in particular at about 1.33 g / cm 3 .
  • the layer is designed for a working temperature range of 40 to 100 ° C, preferably from 50 to 90 ° C, preferably from 60 to 80 ° C.
  • the yield stress preferably the yield stress in the extrusion direction, is in the range of 10 to 100 N / mm 2 , preferably in the range of 20 to 50 N / mm 2 , preferably in the range of 30 to 35 N / mm 2 , in particular about 32 N. / mm 2 .
  • the elongation at break preferably the elongation at break in the direction of extrusion, is in the range of 50 to 1000%, preferably in the range of 200 to 750%, preferably in the range of 300 to 500%, in particular about 400%.
  • the degree of crystallinity in percent mass content is in the range of 60 to 90%, preferably in the range of 65 to 85%, preferably in the range of 70 to 80%.
  • the modulus of elasticity is in the range of 100 to 1000 N / mm 2 , preferably in the range of 400 to 800 N / mm 2 , preferably in the range of 500 to 750 N / mm 2 , in particular about 680 N / mm 2 .
  • the bursting pressure at a (8 x 1) tube with an outer diameter of 8 mm and a wall thickness of 1 mm is in the range of 50 to 150 bar, preferably in the range of 80 to 120 bar, preferably in the range of 90 to 1 10 bar.
  • the fuel absorption when charged with an alcohol-containing fuel at a volume fraction of the alcohol in the fuel of at least 5%, preferably at least 15%, preferably at least 85%, for a period of at least 1000 h, is at most 3 weight percent, preferably at most 2.3 weight percent, preferably at most 2 percent by weight.
  • the fuel line is preferably designed by chemical modification of the Polyoxymethyl- ens and / or by using suitable additives for a working temperature range of 60 to 80 ° C such that even after prolonged exposure to an alcohol-containing fuel at a volume fraction of the alcohol in the fuel of at least 5% a duration of at least 1000 h the above properties are present.
  • the mechanical properties of the at least one layer of polyoxymethylene can be optimized for use in a service line.
  • the at least one layer of polyoxymethylene has at least one of the properties described above even after exposure to an alcohol-containing fuel of the above type for at least 3000 hours at a temperature of 60 ° C.
  • Another aspect of the present invention relates to an arrangement for the management and / or storage of fuels, in particular fuels in motor vehicles, comprising at least one fuel line according to at least one of the preceding embodiments and at least one connected to the fuel line connector and / or at least one fuel tank, in which the fuel line extends at least in sections.
  • the connector is monolithic with the fuel line or positively and / or materially connected, wherein the connection is preferably a plug connection and / or a snap connection and / or a welded connection, wherein the connector preferably contains polyoxymethylene and with the at least one layer is connected to polyoxymethylene, particularly preferably welded, in order to form a continuous inner layer and / or outer layer with polyoxymethylene across the joint.
  • the connector with / from polyoxymethylene may comprise at least one of the aforementioned additives and / or at least one reinforcing material, preferably fibers, preferably glass fibers, wherein the mass fraction of the reinforcing substances is preferably at most 30%.
  • the fuel line is supplied on the inside and / or outside with an alcohol-containing fuel, wherein the volume fraction of the alcohol in the fuel is preferably at least 5%, preferably at least 15%, more preferably at least 85% the temperature of the fuel is in the range of 40 to 100 ° C, preferably in the range of 50 to 90 ° C, preferably in the range of 60 to 80 ° C.
  • the advantages of the invention entail fuel line or the inventive arrangement particularly clearly to advantage.
  • Yet another aspect of the present invention relates to a process for producing a fuel line according to at least one of the preceding embodiments, comprising the steps:
  • Extruding a layer with polyoxymethylene preferably at a processing temperature in a range of 166 to 230 ° C, in particular in a range of 180 to 190 ° C, wherein for extruding preferably a Pastifizierzylinder with axial or spiral grooves and / or a barrier screw is used ; and
  • Thermoforming the fuel line preferably in a temperature range of 100 to 165 ° C, preferably in a temperature range of 120 to 150 ° C, wherein the fuel line is particularly preferably applied with steam or hot air.
  • the degree of crystallinity of the polyoxymethylene can be selectively increased, resulting in increased toughness or impact resistance, and is desirable for the preferred use as a fuel line.
  • thermoforming can be additionally taken on the intended geometry of the fuel line in the idle state influence what u. a. facilitates assembly and can reduce the mechanical stress of the fuel line both during assembly and in the installed state.
  • Preferred applications of the fuel line according to the invention are tank lines for venting or Intank Oberen or low-temperature fuel lines.
  • Fig. 1 shows a schematic sectional view of an arrangement according to the invention for the management and storage of fuels in motor vehicles, comprising a fuel line, two end pieces connected to the fuel line and a fuel tank filled with fuel tank, in which extends the fuel line.
  • the preferred embodiment of the invention relates to a motor vehicle flexible fuel line 1 comprising a single layer of a polyoxymethylene copolymer having the structure - [CH 2 -On-CH 2 -CH 2 -O m ] -. Accordingly, this layer simultaneously forms the inner layer and the outer layer of the fuel line 1 and is exposed to the inside and to the outside of the fuel line 1.
  • the polyoxymethylene copolymer is copolymerized with cyclic ethers and the end groups are blocked.
  • the layer of a polyoxymethylene copolymer may comprise at least one of the aforementioned additives.
  • the preferred method according to the invention for producing the fuel line 1 according to the invention comprises the steps:
  • the fuel line 1 is formed as a smooth tube and is extruded in the process according to the invention with a constant inner cross section and outer cross section.
  • thermoforming the fuel line 1 can be permanently mediated the desired spatial geometry, wherein the fuel line 1, for example, in at least one curvature plane, preferably in two, three or more planes of curvature, is curved.
  • the inner diameter is, for example, 8 mm with a wall thickness of 1 mm.
  • the density of the raw material used or of the polyoxymethylene copolymer is about 1.33 g / cm 3 .
  • the fuel line 1 is preferably designed for a working temperature range of 60 to 80 ° C such that even after continuous exposure to an alcoholic fuel at a volume fraction of the alcohol in the fuel of at least 5% for a period of at least 168 h, the following requirements are fulfilled:
  • the yield stress in the extrusion direction is about 32 N / mm 2 ;
  • the elongation at break in the extrusion direction is at least 500%
  • the degree of crystallinity in percent mass content is in the range of 81 to 84%;
  • the bursting pressure is in the range of 90 to 1 10 bar;
  • the fuel absorption compared to the original state is a maximum of 2 percent by weight.
  • Figure 1 shows a schematic sectional view of an inventive arrangement for the management and storage of fuels in motor vehicles, comprising a fuel line 1 according to the invention, two connected to the fuel line 1 fittings 2 and 4 filled with fuel tank 3, in which the fuel line 1 extends.
  • the volume fraction of the alcohol in fuel 4 is at least 5% and the temperature of the fuel ranges from 60 to 80 ° C.
  • the fittings 2 are made of the same polyoxymethylene copolymer as the fuel line 1 and are welded to the fuel line 1 to form a continuous layer of polyoxymethylene copolymer across the joints.
  • the ends of the fuel line 1 for example. Plugged onto the welding contours of the fittings 2 and subjected to heat to produce the welded joints.
  • the resulting continuous layer of polyoxymethylene copolymer forms a nearly impenetrable fuel barrier with high density, dimensional stability and impact resistance.
  • the fuel line 1 may comprise at least one further layer which contains no polyoxymethylene, in particular at least one textile reinforcing layer, at least one cover layer and / or at least one barrier layer, preferably of a barrier plastic such as PVDF, ETFE, FEP, THV, PVF, PVDF.
  • the operating fluid line 1 or arrangement according to the invention is advantageous over the known solutions of polyamide 12, since it does not permit oligomer leaching with continuous fueling with alcohol-containing fuel, but nevertheless a more favorable permeation behavior, improved dimensional stability, lower volume swelling and a substantially constant flexibility Stiffness shows.
  • Further advantages of the fuel line 1 according to the invention are the availability of the polyoxymethylene and the lower material price compared to PA 12 and the weldability of the fuel line 1 with fittings made of the same material, so that a high-density fuel barrier can be accomplished.
  • the invention is not limited to the embodiment described. Further advantageous embodiments result from the combination of various features disclosed in the description, the claims and the drawings.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

L'invention concerne une conduite de carburant, en particulier une conduite de carburant pour véhicules automobiles, ainsi qu'un ensemble comprenant ladite conduite de carburant, un élément de raccordement connecté à la conduite de carburant et/ou un réservoir de carburant. L'invention vise à proposer une conduite de carburant pour véhicules automobiles qui ne présente pas les inconvénients des conduites de carburant connues en PA 12. A cet effet, la conduite de carburant selon l'invention comprend une couche de polyoxyméthylène. L'invention concerne par ailleurs un ensemble comprenant au moins une conduite de carburant selon l'invention, au moins un élément de raccordement connecté à la conduite de carburant et/ou au moins un réservoir de carburant, dans lequel la conduite de carburant s'étend au moins en partie. L'invention concerne également un procédé de fabrication de la conduite de carburant selon l'invention.
PCT/EP2013/050729 2012-02-01 2013-01-16 Conduite de carburant munie d'au moins une couche de polyoxyméthylène WO2013113555A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13700311.7A EP2809723A1 (fr) 2012-02-01 2013-01-16 Conduite de carburant munie d'au moins une couche de polyoxyméthylène

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012001878.9 2012-02-01
DE102012001878A DE102012001878A1 (de) 2012-02-01 2012-02-01 Betriebsstoffleitung mit wenigstens einer Schicht mit Polyoxymethylen

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WO2013113555A1 true WO2013113555A1 (fr) 2013-08-08

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EP (1) EP2809723A1 (fr)
DE (1) DE102012001878A1 (fr)
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847423A1 (de) * 1978-11-02 1980-05-22 Hoechst Ag Kraftstoffleitung aus kunststoffverbundsystem
JPH04224385A (ja) * 1990-12-21 1992-08-13 Tokai Rubber Ind Ltd 燃料配管用チューブ
US6489388B1 (en) * 1999-06-04 2002-12-03 Ticona Gmbh Polyoxymethylene moldings having improved resistance to diesel fuel and aggressive gasoline
WO2005007384A1 (fr) * 2003-07-03 2005-01-27 Ticona, Llc Procede de fabrication d'articles coextrudes en polyacetal avec profil façonne et couche elastomere thermoplastique liee par voie fondue, et article ainsi obtenu
US20060040120A1 (en) * 2002-11-05 2006-02-23 Ursula Ziegler Composite body made from polyacetal, bonding agent and polyolefin, method for production and use thereof
DE102009051503A1 (de) * 2009-10-30 2011-05-05 Veritas Ag Formschlauch für Kraftstoffanwendungen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847423A1 (de) * 1978-11-02 1980-05-22 Hoechst Ag Kraftstoffleitung aus kunststoffverbundsystem
JPH04224385A (ja) * 1990-12-21 1992-08-13 Tokai Rubber Ind Ltd 燃料配管用チューブ
US6489388B1 (en) * 1999-06-04 2002-12-03 Ticona Gmbh Polyoxymethylene moldings having improved resistance to diesel fuel and aggressive gasoline
US20060040120A1 (en) * 2002-11-05 2006-02-23 Ursula Ziegler Composite body made from polyacetal, bonding agent and polyolefin, method for production and use thereof
WO2005007384A1 (fr) * 2003-07-03 2005-01-27 Ticona, Llc Procede de fabrication d'articles coextrudes en polyacetal avec profil façonne et couche elastomere thermoplastique liee par voie fondue, et article ainsi obtenu
DE102009051503A1 (de) * 2009-10-30 2011-05-05 Veritas Ag Formschlauch für Kraftstoffanwendungen

Also Published As

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DE102012001878A1 (de) 2013-08-01
EP2809723A1 (fr) 2014-12-10

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