WO2014124018A1 - Motor vehicle tank made of crosslinked polymer - Google Patents

Motor vehicle tank made of crosslinked polymer Download PDF

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Publication number
WO2014124018A1
WO2014124018A1 PCT/US2014/014888 US2014014888W WO2014124018A1 WO 2014124018 A1 WO2014124018 A1 WO 2014124018A1 US 2014014888 W US2014014888 W US 2014014888W WO 2014124018 A1 WO2014124018 A1 WO 2014124018A1
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WO
WIPO (PCT)
Prior art keywords
chosen
filled
crosslinking
composition
chemically
Prior art date
Application number
PCT/US2014/014888
Other languages
French (fr)
Inventor
Pascal Dumas
Original Assignee
Illinois Tool Works Inc.
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 Illinois Tool Works Inc. filed Critical Illinois Tool Works Inc.
Publication of WO2014124018A1 publication Critical patent/WO2014124018A1/en

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Classifications

    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73751—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being uncured, i.e. non cross-linked, non vulcanized
    • B29C66/73752—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being uncured, i.e. non cross-linked, non vulcanized the to-be-joined areas of both parts to be joined being uncured
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/68—Containers, packaging elements or packages, specially adapted for particular articles or materials for machines, engines or vehicles in assembled or dismantled form
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2096/00—Use of specified macromolecular materials not provided for in a single one of main groups B29K2001/00 - B29K2095/00, as moulding material
    • B29K2096/02—Graft polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3055—Cars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2312/00—Crosslinking
    • C08L2312/08—Crosslinking by silane
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
    • F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing

Definitions

  • the invention relates to the use of a crosslinked polymer for the preparation, from at least two elements, of an assembly forming a container for a motor vehicle, in particular for forming a degassing tank or an expansion vessel.
  • the invention also provides a process for preparing an assembly forming a motor vehicle container from a crosslinked polymer, and also this assembly.
  • Containers for motor vehicles are subject to numerous constraints, in particular the containers placed in the engine compartment.
  • the constraints endured are mechanical, especially associated with the fixing or holding of these containers, or associated with the internal pressure, but also thermal constraints, especially due to the high temperatures generated during the running of the engine or due to the temperature of the fluids contained.
  • Containers for motor vehicles must also be able to withstand the constraints associated with the environment in which the motor vehicle is used, in particular climatic, mechanical or chemical constraints, especially in terms of chemical resistance to the substances contained, but also to other substances that may be present in their environment.
  • Containers for motor vehicles are therefore usually made of polymeric material.
  • containers for motor vehicles must be resistant or inert with respect to chemical attack. Specifically, these containers must be able to receive fluids without their properties, especially their leaktightness, their capacity or their shape, being modified or impaired. They should not be damaged by the fluids they contain, either as regards gaseous fluids or liquid fluids.
  • the resistance properties of containers for motor vehicles should be particularly high when the constraints to which they are subjected are combined.
  • JP S58 59014 discloses pipes for transporting hot water. These pipes are made of crosslinked polyolefin and the crosslinking is obtained by contact with water.
  • WO 01 /83613 describes the manufacture of tubes made of crosslinked materials which comprise silane groups but no catalyst.
  • the invention relates to the use of a composition comprising at least one grafted or ungrafted crosslinkable polymer, chosen from filled or non-filled polyolefins, filled or non-filled polyamides, and polyurethanes, for the preparation, from at least two elements, of an assembly chosen from containers for motor vehicles.
  • the use according to the invention is implemented for the preparation of an assembly chosen from a degassing tank, an expansion vessel, a power-assisted-steering liquid tank, a brake liquid tank and a windshield-washer liquid tank.
  • the use according to the invention concerns the preparation of an assembly chosen from a degassing tank, an expansion vessel and a power-assisted-steering liquid tank.
  • the use according to the invention implements a composition comprising at least one filled or non-filled crosslinkable polymer, chosen from polyethylene, low-density polyethylene, high-density polyethylene and polyamide 6-6.
  • Polyethylene is preferred, in particular high-density polyethylene.
  • composition used according to the invention may comprise
  • composition used according to the invention may also comprise at least one polymer which is physically crosslinkable by means of a radiation chosen from UV, IR and ⁇ (gamma) radiation.
  • a radiation chosen from UV, IR and ⁇ (gamma) radiation may also comprise at least one polymer which is physically crosslinkable by means of a radiation chosen from UV, IR and ⁇ (gamma) radiation.
  • the invention also provides a process for preparing an assembly chosen from containers for motor vehicles, comprising at least two elements, successively comprising
  • composition comprising at least one grafted or ungrafted crosslinkable polymer, chosen from filled or non- filled polyolefins, filled or non-filled polyamides, and polyurethanes;
  • the process according to the invention allows the preparation of numerous containers for motor vehicles.
  • the process according to the invention makes it possible to prepare a container for a motor vehicle chosen from a degassing tank, an expansion vessel, a power-assisted-steering liquid tank, a brake liquid tank and a windshield-washer liquid tank.
  • the container for a motor vehicle is chosen from a degassing tank, an expansion vessel and a power-assisted-steering liquid tank.
  • the filled or non-filled crosslinkable polymer is preferably chosen from polyethylene, low-density polyethylene, high- density polyethylene and polyamide 6-6.
  • the filled or non-filled crosslinkable polymer is polyethylene, in particular low-density polyethylene or high-density polyethylene.
  • the polymer used is advantageously chosen from grafted crosslinkable polymers.
  • An example of a grafted crosslinkable polymer that may be used is ethylene-vinylsilane (EVS).
  • the process according to the invention is particularly advantageous for the preparation of a degassing tank from a composition comprising high-density polyethylene, or of an expansion vessel from a composition comprising high- density polyethylene, or alternatively of a power-assisted-steering liquid tank from a composition comprising high-density polyethylene and polyamide 6-6, which are filled or non-filled.
  • crosslinking of the polymer used for the process according to the invention is performed chemically or physically.
  • the crosslinking is performed chemically and the composition comprises
  • the crosslinking is performed chemically and the composition comprises o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups, and
  • the crosslinking is performed chemically and the composition comprises
  • the crosslinking is performed physically and the composition comprises at least one polymer that is physically crosslinkable by means of a radiation chosen from UV, IR and ⁇ (gamma) radiation.
  • the process according to the invention allows the preparation of an assembly such as a container for a motor vehicle.
  • the elements of the assembly according to the invention are prepared by molding from a composition based on at least one crosslinkable polymer.
  • the molding of the process according to the invention may be performed under the same pressure and temperature conditions as for a non-crosslinkable polymer.
  • the process according to the invention allows the preparation of numerous assemblies chosen from containers for motor vehicles.
  • the invention relates to an assembly chosen from containers for motor vehicles, comprising at least two elements and which is prepared or may be prepared according to the process of the invention.
  • the assembly according to the invention is chosen from a degassing tank, an expansion vessel, a power-assisted-steering liquid tank, a brake liquid tank and a windshield-washer liquid tank.
  • the assembly according to the invention is chosen from a degassing tank prepared from a composition comprising high-density polyethylene, or an expansion vessel prepared from a composition comprising high-density polyethylene, or alternatively a power-assisted-steering liquid tank prepared from a composition comprising high-density polyethylene and polyamide 6-6, which may be filled or non-filled.
  • Figure 1 illustrates the aspect of a degassing tank according to the invention after heating compared with a reference tank after heating.
  • a degassing tank according to the invention was manufactured from a first composition comprising grafted high-density polyethylene and from a second composition comprising high-density polyethylene and a catalyst.
  • a mixture of the first (98% by weight) and second (2% by weight) compositions was injected and then two half-sections of the degassing tank were molded. The two half-sections of the tank were then hot-welded to form the tank.
  • the degassing tank according to the invention was then immersed in water at 80 °C for 48 hours in order to accelerate the crosslinking of the grafted high- density polyethylene.
  • a reference degassing tank was manufactured under the same conditions from a composition comprising non-crosslinked polypropylene that is approved for this application.
  • the two tanks were placed for 10 minutes in an oven heated at 200 ⁇ ⁇ .
  • the reference tank collapses under its own weight, whereas the tank according to the invention undergoes little deformation.
  • FIG 1 illustrates the aspect of each of the tanks after heating. This test clearly illustrates that the mechanical properties of the tank according to the invention are better than those of the reference tank.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to the use of a crosslinked polymer for the preparation, from at least two elements, of an assembly forming a container for a motor vehicle, in particular for forming a degassing tank or an expansion vessel. The invention also provides a process for preparing an assembly forming a container for a motor vehicle from a crosslinked polymer, and also this assembly.

Description

MOTOR VEHICLE TANK MADE OF CROSSLINKED POLYMER
DESCRIPTION
The invention relates to the use of a crosslinked polymer for the preparation, from at least two elements, of an assembly forming a container for a motor vehicle, in particular for forming a degassing tank or an expansion vessel.
The invention also provides a process for preparing an assembly forming a motor vehicle container from a crosslinked polymer, and also this assembly. Containers for motor vehicles are subject to numerous constraints, in particular the containers placed in the engine compartment.
The constraints endured are mechanical, especially associated with the fixing or holding of these containers, or associated with the internal pressure, but also thermal constraints, especially due to the high temperatures generated during the running of the engine or due to the temperature of the fluids contained.
Containers for motor vehicles must also be able to withstand the constraints associated with the environment in which the motor vehicle is used, in particular climatic, mechanical or chemical constraints, especially in terms of chemical resistance to the substances contained, but also to other substances that may be present in their environment.
These constraints require the use of manufacturing materials that are sufficiently resistant. Containers for motor vehicles are therefore usually made of polymeric material.
The mass of these containers should be limited, whereas their resistance, especially their mechanical strength or heat resistance, should be increased.
Moreover, containers for motor vehicles must be resistant or inert with respect to chemical attack. Specifically, these containers must be able to receive fluids without their properties, especially their leaktightness, their capacity or their shape, being modified or impaired. They should not be damaged by the fluids they contain, either as regards gaseous fluids or liquid fluids.
They should not be damaged by the other fluids present in their environment, in particular by the other fluids used in a motor vehicle, especially in the engine compartment.
The resistance properties of containers for motor vehicles should be particularly high when the constraints to which they are subjected are combined.
These properties must be maintained over time.
The use of crosslinked materials for manufacturing objects is known. JP S58 59014 discloses pipes for transporting hot water. These pipes are made of crosslinked polyolefin and the crosslinking is obtained by contact with water. WO 01 /83613 describes the manufacture of tubes made of crosslinked materials which comprise silane groups but no catalyst.
US 2009/075004 describes the manufacture by extrusion and thermoforming of single-walled or double-walled tubes. The material used is high-density polyethylene (HDPE). The crosslinking is obtained in the presence of moisture. None of these documents concerns the manufacture of containers for motor vehicles.
The known containers for motor vehicles do not make it possible to provide satisfactory solutions to the problems encountered, in particular from a technical point of view and within acceptable costs.
The use and the process according to the invention provide a solution to all or some of the problems of the prior art containers for motor vehicles.
Moreover, during their manufacture, the containers for motor vehicles prepared from several elements must be assembled. These elements must be fixed together, in particular by welding or bonding. When these elements are prepared from a crosslinkable material and when crosslinking takes place, the elements can no longer be assembled by bonding or welding.
The process according to the invention constitutes a solution to this problem.
There is thus a need to improve the properties of containers for motor vehicles and also the processes for preparing them.
The invention relates to the use of a composition comprising at least one grafted or ungrafted crosslinkable polymer, chosen from filled or non-filled polyolefins, filled or non-filled polyamides, and polyurethanes, for the preparation, from at least two elements, of an assembly chosen from containers for motor vehicles. Preferably, the use according to the invention is implemented for the preparation of an assembly chosen from a degassing tank, an expansion vessel, a power-assisted-steering liquid tank, a brake liquid tank and a windshield-washer liquid tank.
Particularly preferably, the use according to the invention concerns the preparation of an assembly chosen from a degassing tank, an expansion vessel and a power-assisted-steering liquid tank.
The use according to the invention allows the implementation of numerous crosslinkable polymers.
Advantageously, the use according to the invention implements a composition comprising at least one filled or non-filled crosslinkable polymer, chosen from polyethylene, low-density polyethylene, high-density polyethylene and polyamide 6-6.
Polyethylene is preferred, in particular high-density polyethylene.
For the use according to the invention, the composition comprises at least one polymer which may be chemically or physically crosslinked. Advantageously, the composition used according to the invention may comprise o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups, and
o a crosslinking catalyst.
Also advantageously, the composition used according to the invention may comprise
o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups, and
o at least one crosslinking agent chosen from peroxides. Also advantageously, the composition used according to the invention may comprise
o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups,
o a crosslinking catalyst and
o at least one crosslinking agent chosen from peroxides.
Advantageously, the composition used according to the invention may also comprise at least one polymer which is physically crosslinkable by means of a radiation chosen from UV, IR and γ (gamma) radiation. The invention also provides a process for preparing an assembly chosen from containers for motor vehicles, comprising at least two elements, successively comprising
• molding of the elements using a composition comprising at least one grafted or ungrafted crosslinkable polymer, chosen from filled or non- filled polyolefins, filled or non-filled polyamides, and polyurethanes;
• welding or bonding of the elements;
• crosslinking of the polymer.
The process according to the invention allows the preparation of numerous containers for motor vehicles.
Preferably, the process according to the invention makes it possible to prepare a container for a motor vehicle chosen from a degassing tank, an expansion vessel, a power-assisted-steering liquid tank, a brake liquid tank and a windshield-washer liquid tank.
Particularly preferably, the container for a motor vehicle is chosen from a degassing tank, an expansion vessel and a power-assisted-steering liquid tank.
For the process according to the invention, the filled or non-filled crosslinkable polymer is preferably chosen from polyethylene, low-density polyethylene, high- density polyethylene and polyamide 6-6.
Particularly advantageously, the filled or non-filled crosslinkable polymer is polyethylene, in particular low-density polyethylene or high-density polyethylene.
The polymer used is advantageously chosen from grafted crosslinkable polymers. An example of a grafted crosslinkable polymer that may be used is ethylene-vinylsilane (EVS).
The process according to the invention is particularly advantageous for the preparation of a degassing tank from a composition comprising high-density polyethylene, or of an expansion vessel from a composition comprising high- density polyethylene, or alternatively of a power-assisted-steering liquid tank from a composition comprising high-density polyethylene and polyamide 6-6, which are filled or non-filled.
The crosslinking of the polymer used for the process according to the invention is performed chemically or physically.
Advantageously, for the process according to the invention, the crosslinking is performed chemically and the composition comprises
o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups, and
o a crosslinking catalyst.
Also advantageously, the crosslinking is performed chemically and the composition comprises o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups, and
o at least one crosslinking agent chosen from peroxides. Also advantageously, the crosslinking is performed chemically and the composition comprises
o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups,
o a crosslinking catalyst and
o at least one crosslinking agent chosen from peroxides. Also advantageously, the crosslinking is performed physically and the composition comprises at least one polymer that is physically crosslinkable by means of a radiation chosen from UV, IR and γ (gamma) radiation.
The process according to the invention allows the preparation of an assembly such as a container for a motor vehicle. The elements of the assembly according to the invention are prepared by molding from a composition based on at least one crosslinkable polymer.
For an equivalent polymer, the molding of the process according to the invention may be performed under the same pressure and temperature conditions as for a non-crosslinkable polymer.
The process according to the invention allows the preparation of numerous assemblies chosen from containers for motor vehicles.
Thus, the invention relates to an assembly chosen from containers for motor vehicles, comprising at least two elements and which is prepared or may be prepared according to the process of the invention.
Preferably, the assembly according to the invention is chosen from a degassing tank, an expansion vessel, a power-assisted-steering liquid tank, a brake liquid tank and a windshield-washer liquid tank.
Particularly preferably, the assembly according to the invention is chosen from a degassing tank prepared from a composition comprising high-density polyethylene, or an expansion vessel prepared from a composition comprising high-density polyethylene, or alternatively a power-assisted-steering liquid tank prepared from a composition comprising high-density polyethylene and polyamide 6-6, which may be filled or non-filled.
Figure 1 illustrates the aspect of a degassing tank according to the invention after heating compared with a reference tank after heating.
The examples that follow are given as illustrations of the various aspects of the invention.
A degassing tank according to the invention was manufactured from a first composition comprising grafted high-density polyethylene and from a second composition comprising high-density polyethylene and a catalyst.
A mixture of the first (98% by weight) and second (2% by weight) compositions was injected and then two half-sections of the degassing tank were molded. The two half-sections of the tank were then hot-welded to form the tank.
The degassing tank according to the invention was then immersed in water at 80 °C for 48 hours in order to accelerate the crosslinking of the grafted high- density polyethylene.
Moreover, a reference degassing tank was manufactured under the same conditions from a composition comprising non-crosslinked polypropylene that is approved for this application.
The two tanks were placed for 10 minutes in an oven heated at 200 <Ό.
Under the effect of the temperature above their melting point, the reference tank collapses under its own weight, whereas the tank according to the invention undergoes little deformation.
Figure 1 illustrates the aspect of each of the tanks after heating. This test clearly illustrates that the mechanical properties of the tank according to the invention are better than those of the reference tank.

Claims

1 . The use of a composition comprising at least one grafted or ungrafted 5 crosslinkable polymer, chosen from filled or non-filled polyolefins, filled or nonfilled polyamides, and polyurethanes, for the preparation, from at least two elements, of an assembly chosen from containers for motor vehicles.
2. The use as claimed in claim 1 , for the preparation of an assembly chosen i o from a degassing tank, an expansion vessel, a power-assisted-steering liquid tank, a brake liquid tank and a windshield-washer liquid tank.
3. The use as claimed in claim 1 or 2, of a composition comprising at least one filled or non-filled crosslinkable polymer, chosen from polyethylene, low-density
15 polyethylene, high-density polyethylene and polyamide 6-6.
4. The use as claimed in claims 1 to 3, of a composition comprising at least one chemically or physically crosslinkable polymer.
20 5. The use as claimed in claim 4,
• of a composition comprising
o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups, and
o a crosslinking catalyst; or
25 · of a composition comprising
o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups, and
o at least one crosslinking agent chosen from peroxides; or
• of a composition comprising
30 o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups,
o a crosslinking catalyst and o at least one crosslinking agent chosen from peroxides; or
• of a composition comprising at least one polymer which is physically crosslinkable by means of a radiation chosen from UV, IR and γ (gamma) radiation.
6. A process for preparing an assembly chosen from containers for motor vehicles, comprising at least two elements, successively comprising:
• molding of the elements using a composition comprising at least one grafted or ungrafted crosslinkable polymer, chosen from filled or non- filled polyolefins, filled or non-filled polyamides, and polyurethanes;
• welding or bonding of the elements;
• crosslinking of the polymer.
7. The process as claimed in claim 6, for the preparation of an assembly chosen from a degassing tank, an expansion vessel, a power-assisted-steering liquid tank, a brake liquid tank and a windshield-washer liquid tank.
8. The process as claimed in claim 6 or 7, for which the filled or non-filled crosslinkable polymer is chosen from polyethylene, low-density polyethylene, high-density polyethylene and polyamide 6-6.
9. The process as claimed in claims 6 to 8, for which the crosslinking is performed chemically or physically.
10. The process as claimed in claim 9, for which
• the crosslinking is performed chemically and the composition comprises o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups, and
o a crosslinking catalyst; or
· the crosslinking is performed chemically and the composition comprises o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups, and o at least one crosslinking agent chosen from peroxides; or
• the crosslinking is performed chemically and the composition comprises o at least one chemically crosslinkable polymer, which is ungrafted or grafted with silane groups,
5 o a crosslinking catalyst and
o at least one crosslinking agent chosen from peroxides; or
• the crosslinking is performed physically and the composition comprises at least one polymer that is physically crosslinkable by means of a radiation chosen from UV, IR and γ (gamma) radiation.
o
1 1 . An assembly chosen from containers for motor vehicles, comprising at least two elements and which is prepared or may be prepared according to the process of claims 6 to 10. 5 12. The assembly as claimed in claim 1 1 , chosen from a degassing tank, an expansion vessel, a power-assisted-steering liquid tank, a brake liquid tank and a windshield-washer liquid tank.
PCT/US2014/014888 2013-02-07 2014-02-05 Motor vehicle tank made of crosslinked polymer WO2014124018A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1351065A FR3001716B1 (en) 2013-02-07 2013-02-07 TANK FOR AUTOMOBILE IN RETICULATED POLYMER
FR1351065 2013-02-07

Publications (1)

Publication Number Publication Date
WO2014124018A1 true WO2014124018A1 (en) 2014-08-14

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FR (1) FR3001716B1 (en)
WO (1) WO2014124018A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5859014A (en) 1981-08-27 1983-04-07 Dainichi Nippon Cables Ltd Method of connecting polyolefin pipe
JPS59101327A (en) * 1982-11-30 1984-06-11 Dainichi Nippon Cables Ltd Method of joining water-crosslinkable polyolefin pipe
WO2001083613A2 (en) 2000-04-28 2001-11-08 Golan Plastic Products Weldable articles made of cross-linked polyolefins
CA2461389A1 (en) * 2003-03-21 2004-09-21 Atofina Multilayer structure based on polyamides and graft copolymers having polyamide blocks
US20090075004A1 (en) 2006-11-21 2009-03-19 Advanced Drainage Systems, Inc. Apparatus and methods for cross-linked corrugated polyethylene pipe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5859014A (en) 1981-08-27 1983-04-07 Dainichi Nippon Cables Ltd Method of connecting polyolefin pipe
JPS59101327A (en) * 1982-11-30 1984-06-11 Dainichi Nippon Cables Ltd Method of joining water-crosslinkable polyolefin pipe
WO2001083613A2 (en) 2000-04-28 2001-11-08 Golan Plastic Products Weldable articles made of cross-linked polyolefins
CA2461389A1 (en) * 2003-03-21 2004-09-21 Atofina Multilayer structure based on polyamides and graft copolymers having polyamide blocks
US20090075004A1 (en) 2006-11-21 2009-03-19 Advanced Drainage Systems, Inc. Apparatus and methods for cross-linked corrugated polyethylene pipe

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FR3001716B1 (en) 2015-01-30

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