EP0360648A1 - Elastische, undurchlässige Membran und damit ausgestattete hydropneumatische Akkumulatoren - Google Patents
Elastische, undurchlässige Membran und damit ausgestattete hydropneumatische Akkumulatoren Download PDFInfo
- Publication number
- EP0360648A1 EP0360648A1 EP89402381A EP89402381A EP0360648A1 EP 0360648 A1 EP0360648 A1 EP 0360648A1 EP 89402381 A EP89402381 A EP 89402381A EP 89402381 A EP89402381 A EP 89402381A EP 0360648 A1 EP0360648 A1 EP 0360648A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- ethylene
- vinyl alcohol
- film
- membrane according
- 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.)
- Granted
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 71
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims abstract description 45
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims abstract description 41
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 41
- 229920000578 graft copolymer Polymers 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 77
- 229920002614 Polyether block amide Polymers 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 17
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims description 15
- 229920002635 polyurethane Polymers 0.000 claims description 11
- 239000004814 polyurethane Substances 0.000 claims description 11
- 238000004898 kneading Methods 0.000 claims description 8
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical group C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 7
- 229920001971 elastomer Polymers 0.000 claims description 7
- 239000005060 rubber Substances 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims description 6
- 229920002647 polyamide Polymers 0.000 claims description 6
- 229920002292 Nylon 6 Polymers 0.000 claims description 5
- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 4
- 239000005977 Ethylene Substances 0.000 claims description 4
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 4
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 4
- 229920001897 terpolymer Polymers 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- 239000003522 acrylic cement Substances 0.000 claims 1
- 150000002148 esters Chemical class 0.000 claims 1
- 239000000725 suspension Substances 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- -1 acrylic ester Chemical class 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- 239000004416 thermosoftening plastic Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000010348 incorporation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- VPRUMANMDWQMNF-UHFFFAOYSA-N phenylethane boronic acid Chemical compound OB(O)CCC1=CC=CC=C1 VPRUMANMDWQMNF-UHFFFAOYSA-N 0.000 description 3
- 229920003225 polyurethane elastomer Polymers 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
- F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
- F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/20—Accumulator cushioning means
- F15B2201/205—Accumulator cushioning means using gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/30—Accumulator separating means
- F15B2201/315—Accumulator separating means having flexible separating means
- F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/30—Accumulator separating means
- F15B2201/315—Accumulator separating means having flexible separating means
- F15B2201/3155—Accumulator separating means having flexible separating means characterised by the material of the flexible separating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/60—Assembling or methods for making accumulators
- F15B2201/61—Assembling or methods for making separating means therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/23907—Pile or nap type surface or component
- Y10T428/23979—Particular backing structure or composition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
Definitions
- the present invention essentially relates to an elastic waterproof membrane.
- hydropneumatic accumulator equipped with this membrane and used for example in motor vehicle suspensions, which accumulator is generally in the form of a sphere separated by the membrane into two chambers or compartments, one of which contains a gas such than nitrogen, and the other of which contains a liquid.
- the membranes for a pressure accumulator must have properties of both flexibility and impermeability so as to allow good transmission of the pressures between the two compartments containing the liquid and the gas respectively.
- Elastic membranes made from different materials have already been proposed, and in this regard, reference may be made, for example, to documents FR-A-2 443 622 and FR-A-1 494 473.
- the known membranes made for example of a thermoplastic material of the polyurethane type have an impermeability to gas which is imperfect, which results, after a few years of use on a vehicle, by a drop in the pressure of the prevailing gas. inside the sphere fitted with the membrane, so that the sphere must be replaced to maintain the desired characteristics.
- the present invention aims to remedy these drawbacks by proposing a membrane for suspension spheres or braking systems of vehicles, which, because of its particular constitution, presents an excellent compromise of the properties of flexibility, sealing against liquid, and gas impermeability.
- the invention relates to an elastic waterproof membrane intended in particular to equip a hydropneumatic accumulator and to be subjected on one side to the pressure of a gas and on the other side to the pressure of a liquid.
- this membrane comprising in combination at least two materials, and being characterized by a first material giving the membrane the required elasticity and chosen from thermoplastic polyurethanes, polyether block amides, flexible polyesters or any mixture thereof, and by a second material embedded in the mass of the first material to achieve impermeability to gas and chosen from an ethylene-vinyl alcohol copolymer, polyamides, polyvinylidene chloride or any mixture thereof.
- the membrane according to this invention will be flexible and flexible in a temperature range which can range from -35 ° C to + 120 ° C, will resist mineral hydraulic fluid or brake fluid used on the vehicle, and will advantageously have almost permeability zero for gases, such as nitrogen in particular.
- the membrane according to this invention results from a kneading of the above-mentioned thermoplastic polyurethane and of the copolymer ethylene vinyl alcohol, aforementioned alcohol, to produce a graft polymer according to the reaction
- the proportion of the second material such as ethylene vinyl alcohol for example relative to the first material such as the thermoplastic polyurethane is between approximately 5 and 20%.
- the membrane consists of at least one film based on the above grafted polymer having a thickness of between approximately 10 and 200 microns and sandwiched between at least two layers of the first aforementioned material.
- the aforementioned graft polymer forming film results from a kneading of the first and second materials mentioned above in a proportion of 50 to 95% of the second material relative to the first material.
- the membrane consists of at least one film of the aforementioned second material sandwiched between two layers of the aforementioned first material.
- the aforementioned second material preferably consisting of an ethylene-vinyl alcohol copolymer
- a third material chosen from polyamide 6, polyether amide blocks, terpolymers of ethylene, acrylic ester and maleic anhydride or other polymers of the same type acting as an adhesive, in a proportion of 5 to 20% compared to the second material.
- the membrane consists of at least one film consisting of the second aforementioned material or by a mixture of the second and third aforementioned materials, said film being sandwiched between at least two layers of a material chosen from a polyether block amide modified with a butadiene-styrene-acrylonitrile rubber, or a mixture of polyurethane and polyether block amides modified with a butadiene-styrene-acrylonitrile rubber.
- the ethylene-vinyl alcohol alcohol copolymer is incorporated into the polyurethane during the polymerization thereof to produce the abovementioned graft polymer.
- the membrane according to this invention can be obtained by molding this grafted polymer.
- the invention also relates to a hydropneumatic accumulator equipped with a membrane corresponding to any one of the above characteristics and having a considerable gain in impermeability to gases compared to known membranes, and this without altering the essential qualities of flexibility and flexibility of said membrane.
- an elastic and waterproof membrane consists of two different materials, namely: - a first material serving as a matrix and giving the membrane the desired elasticity and flexibility, easy mounting and inflation possibilities in the sphere, as well as good chemical resistance to the liquid in the sphere, which first material is chosen among the thermoplastic polyurethanes (TPU), the polyether amide blocks (PEBA), the flexible polyesters, or a mixture or cutting in various proportions of two or more of the above materials; and a second material embedded in the mass or matrix formed by the first material and giving the membrane excellent impermeability to gases, in particular to nitrogen, which second material is chosen from an ethylene-vinyl alcohol copolymer (EVOH), polyamides such as those known under the name PA6, PA6-6, PA11 or PA12, polyvinylidene chloride (PVDC) or any mixture thereof.
- first material is chosen among the thermoplastic polyurethanes (TPU), the polyether amide blocks (PEBA), the flexible polyesters, or a mixture or cutting in various proportions of two or
- the proportion of the second material relative to the first material serving as a matrix is between approximately 5 and 20%.
- the alloying of the above first and second materials is carried out by kneading at a high temperature, for example between 150 and 250 ° C.
- This mixing can be carried out in a conventional mixer known under the name BUSS commonly used in the thermoplastics industry.
- the mixing can also be carried out directly in the screw of a conventional press for injecting plastics, this press being used for the manufacture of the membrane.
- a dosing hopper as is known, can be associated with the press to ensure a constant proportion of the second material relative to the first material constituting the matrix.
- thermoplastic polyurethanes TPU
- EVOH ethylene-vinyl alcohol copolymer
- thermoplastic polyurethane ethylene-vinyl alcohol copolymer leading to the formation of a grafted polymer, according to the following reaction:
- the grafting is obtained by chemical reaction of the hydroxyl groups of the ethylene-vinyl alcohol copolymer on the isocyanate groups of the thermoplastic polyurethane.
- Thermogravimetric analyzes (ATD / ATG)
- Thermogravimetric analyzes were carried out respectively on: - Thermoplastic polyurethane (TPU) known under the trade name DESMOPAN 385-BAYER, constituting the first material; - ethylene-vinyl alcohol copolymer (EVOH), constituting the second material; and - The graft polymer resulting from the reaction of the thermoplastic polyurethane and the ethylene-vinyl alcohol copolymer above in the respective proportions of 90% and 10%.
- TPU Thermoplastic polyurethane
- DESMOPAN 385-BAYER ethylene-vinyl alcohol copolymer
- EVOH ethylene-vinyl alcohol copolymer
- thermogravimetric analysis namely that the characteristic peaks of the copolymer d ethylene vinyl alcohol is not found in the grafted polymer, which confirms, once again, the grafting reaction.
- Viscosity measurements with a capillary rheometer were carried out at two different temperatures, 200 and 220 ° C, and at four different shear rates, 200, 500, 1000 and 3000 s ⁇ 1, on the same materials as before, namely polyurethane thermoplastic, ethylene-vinyl alcohol copolymer and graft polymer.
- the viscosity of TPU and EVOH was measured on granules before transformation, while that of the grafted polymer was measured on parts, that is to say after transformation.
- thermoplastic materials can only cause the viscosity to drop as a result of the breaking of the macromolecular chains, this drop in viscosity generally being 5 to 15%.
- the grafted polymer has a higher viscosity, especially at 220 ° C., than those of TPU and EVOH.
- This grafting leads to the creation of new longer macromolecular chains and constituting the grafted polymer, hence a higher viscosity for this grafted polymer, since it is well known that the viscosity of the polymers is linked to the length of their macromolecular chains.
- the applicants also carried out nitrogen impermeability measurements (at 100 ° C.) on the thermoplastic polyurethane and on the grafted polymer resulting from the reaction of 90% of thermoplastic polyurethane and 10% of ethylene-alcohol copolymer vinyl.
- a membrane M made up of "impermeable" islands 1 of ethylene-vinyl alcohol copolymer grafted onto the matrix made up of thermoplastic polyurethane.
- the islands 1, as can be seen in the figure, are elongated in the direction of the extrusion of the membrane and the diffusion of gas through it can only be done by bypassing these islands as materialized by the arrow F.
- the length of the path to be traveled by the gas molecules is greatly increased, which amounts to fictitiously increasing the thickness of the membrane and therefore very greatly reducing the permeability of the membrane to gas.
- the membrane M consists of at least one film 2 of grafted polymer, as explained above, this film having a thickness of between approximately 10 and 200 microns and being sandwiched between two layers 3 of the aforementioned first material, such as a thermoplastic polyurethane.
- the manufacture of the membrane visible in FIG. 2 can be carried out using a bi-material injection press, commonly used in the thermoplastic processing industry.
- the grafted polymer constituting the film 2 can be obtained by mixing thermoplastic polyurethane for example and of ethylene-vinyl alcohol copolymer (EVOH) in a proportion of 50 to 95% of EVOH by compared to thermoplastic polyurethane.
- thermoplastic polyurethane for example and of ethylene-vinyl alcohol copolymer (EVOH) in a proportion of 50 to 95% of EVOH by compared to thermoplastic polyurethane.
- EVOH ethylene-vinyl alcohol copolymer
- This mixing can be carried out in a few minutes at a temperature between 150 and 250 ° C, as explained above.
- the film 2 as can be seen in FIG. 1, contains a large number of impermeable islands forming an almost impassable gas barrier.
- the very small thickness of the film 2 incorporated between the two layers 3 is such that the membrane M, which may have a total thickness of 2 to 4 mm, is not excessively rigid and retains all its flexibility.
- the gain in impermeability of the membrane illustrated in FIG. 2 compared to a conventional membrane made of polyurethane is of the order of 90%, which amounts to multiplying by ten the lifetime of such a membrane equipping for example suspension spheres for motor vehicles.
- the impermeable film 2 may simply consist of the second material mentioned at the start of this description, namely an ethylene-vinyl alcohol copolymer, a polyamide, polyvinylidene chloride or a mixture of two. or more of these materials, while the two layers 3 between which the film 2 is incorporated consist of the first material mentioned at the start of this description, namely thermoplastic polyurethane, polyether block amides, flexible polyesters or any mixture thereof this.
- the waterproof film 2 is obtained with a bi-material injection press commonly used in the thermoplastic processing industry.
- the thickness of this film can, as was the case in the previous embodiment, have a thickness between 10 and 200 microns.
- the gain in impermeability is very high, that is to say of the order of 90%, compared with a conventional membrane made of polyurethane alone.
- the film 2 consists of an ethylene-vinyl alcohol copolymer mixed with another material which may be polyamide 6, polyether block amides, terpolymers of ethylene, acrylic ester and maleic anhydride, or other polymers of the same type acting as an adhesive, and this in a proportion of 5 to 20% relative to the ethylene vinyl alcohol copolymer.
- another material which may be polyamide 6, polyether block amides, terpolymers of ethylene, acrylic ester and maleic anhydride, or other polymers of the same type acting as an adhesive, and this in a proportion of 5 to 20% relative to the ethylene vinyl alcohol copolymer.
- the layers 3 between which the film 2 is incorporated are made of thermoplastic polyurethane.
- the procedure is as indicated in the previous embodiments, that is to say that a mixing of the materials is carried out for a few minutes between 150 and 250 ° C. Then, the incorporation of the waterproof film 2 between the layers 3 is carried out with a bi-material injection press of a type known per se.
- the thickness of the film 2 must be relatively small and as defined in the previous embodiments.
- the impermeable film 2 can be produced either from the second material cited at the start of this description, that is to say ethylene-vinyl alcohol copolymer, polyamide, polyvinylidene chloride or any mixture thereof, or in a mixture of this material with the other material mentioned above, namely polyamide 6, polyether amide blocks, terpolymer of ethylene, acrylic ester and maleic anhydride, or other polymer of the same type acting as an adhesive .
- the film 2 is incorporated here between two layers of a material which can be either a polyether amide blocks (PEBA) modified with a butadiene-styrene-acrylonitrile rubber (NBR), or a mixture of polyurethane and a polyether amide blocks modified with butadiene-styrene-acrylonitrile rubber, this mixture being able to be made by kneading the two materials for a few minutes between 150 and 250 ° C.
- PEBA polyether amide blocks
- NBR butadiene-styrene-acrylonitrile rubber
- the incorporation of the impermeable film 2 is done with a bi-material injection press, the thickness of this film being as defined above.
- the materials used for the layers 3 of the membrane M give it additional advantages which are better resistance to high temperature due to the incorporation of butadiene-styrene-acrylonitrile rubber (NBR) and better adhesion of the film 2 to the layers 3 being given the presence of the polyamide phase in these layers made up in part of polyether amide blocks.
- NBR butadiene-styrene-acrylonitrile rubber
- Such a membrane can equip suspension spheres which must withstand temperatures which can reach, at a peak, 130 or 140 ° C.
- this grafted polymer can be obtained by incorporating the ethylene-vinyl alcohol copolymer into the polyurethane during, or into the end of the polyurethane polymerization operation.
- this allows the grafted polymer to be obtained or synthesized more directly than by only a kneading operation.
- This material has a gain in gas impermeability of 50% compared to a non-grafted kneadable polyurethane rubber.
- the aforementioned material which, once again, is a kneadable polyurethane rubber grafted with molecular chains of ethylene-vinyl alcohol copolymer can be molded to produce a sphere membrane using conventional techniques.
- the advantage of this membrane is its resistance to high temperature, for example of the order of 140 ° C.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Laminated Bodies (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
- Graft Or Block Polymers (AREA)
- Polyurethanes Or Polyureas (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8812274 | 1988-09-20 | ||
FR8812274A FR2636638B1 (fr) | 1988-09-20 | 1988-09-20 | Membrane elastique impermeable et accumulateur hydropneumatique equipe de cette membrane |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0360648A1 true EP0360648A1 (de) | 1990-03-28 |
EP0360648B1 EP0360648B1 (de) | 1991-10-02 |
Family
ID=9370179
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89402381A Expired - Lifetime EP0360648B1 (de) | 1988-09-20 | 1989-08-31 | Elastische, undurchlässige Membran und damit ausgestattete hydropneumatische Akkumulatoren |
Country Status (6)
Country | Link |
---|---|
US (1) | US5036110A (de) |
EP (1) | EP0360648B1 (de) |
JP (1) | JP2744817B2 (de) |
DE (1) | DE68900297D1 (de) |
ES (1) | ES2027067T3 (de) |
FR (1) | FR2636638B1 (de) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9004560U1 (de) * | 1990-04-23 | 1991-08-22 | Bran + Luebbe GmbH, 2000 Norderstedt | Verbundmembran |
DE4117411A1 (de) * | 1990-05-31 | 1991-12-05 | Nok Corp | Laminierter flaechenhafter koerper |
FR2667118A1 (fr) * | 1990-09-26 | 1992-03-27 | Nok Corp | Vessie pour accumulateur. |
EP0482916A1 (de) * | 1990-10-23 | 1992-04-29 | Honda Giken Kogyo Kabushiki Kaisha | Speicher |
FR2669081A1 (fr) * | 1990-11-10 | 1992-05-15 | Bosch Gmbh Robert | Accumulateur hydropneumatique a vessie. |
DE4231927A1 (de) * | 1992-09-24 | 1994-03-31 | Hydac Technology Gmbh | Kunststoffmembran, Verfahren zu ihrer Herstellung sowie ihre Verwendung |
FR2700375A1 (fr) * | 1993-01-13 | 1994-07-13 | Peugeot | Membrane élastique imperméable. |
EP0859156A1 (de) * | 1997-02-17 | 1998-08-19 | Automobiles Peugeot | Elastische, gasundurchlässige Membran und damit ausgestattete hydropneumatische Akkumulatoren |
EP0858883A1 (de) * | 1997-02-17 | 1998-08-19 | Elf Atochem S.A. | Elastische, gasundurchlässige Membran und damit ausgestattete hydropneumatische Akkumulatoren |
WO2003085270A2 (de) * | 2002-04-10 | 2003-10-16 | Hydac Technology Gmbh | Hydrospeicher, vorzugsweise membranspeicher |
EP2175205A1 (de) | 2008-10-09 | 2010-04-14 | Winkelmann Sp. z o.o. | Membrandruckausdehnungsgefäss |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4243652C2 (de) * | 1991-12-27 | 1999-04-01 | Tokai Rubber Ind Ltd | Flexibles Trennwandelement für einen Flüssigkeitsspeicher |
US5618629A (en) * | 1991-12-27 | 1997-04-08 | Tokai Rubber Industries, Inc. | Flexible partition member for hydraulic accumulator, including ethylene-vinyl alcohol copolymer gas-barrier layer and polyamide resin elastic layer |
US5456787A (en) * | 1993-12-01 | 1995-10-10 | J. E. Miles, Inc. | Method for making a hydropneumatic accumulator |
US5952065A (en) * | 1994-08-31 | 1999-09-14 | Nike, Inc. | Cushioning device with improved flexible barrier membrane |
DE69529255T2 (de) * | 1994-08-31 | 2009-09-17 | Nike International Ltd., Beaverton | Gas-aufgeblasene Blase zum Polstern |
TW399014B (en) | 1994-08-31 | 2000-07-21 | Nike Inc | Laminated resilient flexible barrier membranes |
CA2614605C (en) * | 1995-06-07 | 2011-04-19 | Nike International Ltd. | Membranes of polyurethane based materials including polyester polyols |
US6599597B1 (en) | 1995-06-07 | 2003-07-29 | Nike, Inc. | Barrier membranes including a barrier layer employing aliphatic thermoplastic urethanes |
US6013340A (en) | 1995-06-07 | 2000-01-11 | Nike, Inc. | Membranes of polyurethane based materials including polyester polyols |
US6116585A (en) * | 1997-08-11 | 2000-09-12 | Mannesmann Sachs Ag | Pressure holder with an enclosed gas mass |
AU752631B2 (en) | 1998-09-11 | 2002-09-26 | Nike Innovate C.V. | Flexible membranes |
US6082025A (en) * | 1998-09-11 | 2000-07-04 | Nike, Inc. | Flexible membranes |
US6127026A (en) * | 1998-09-11 | 2000-10-03 | Nike, Inc. | Flexible membranes |
US7229518B1 (en) * | 2000-11-02 | 2007-06-12 | Nike, Inc. | Process for improving interfacial adhesion in a laminate |
DE10112976A1 (de) * | 2001-03-17 | 2002-10-02 | Hydac Technology Gmbh | Hydropneumatischer Druckspeicher |
GB0126361D0 (en) * | 2001-11-02 | 2002-01-02 | Secr Defence | Protective apparel |
US20060096990A1 (en) * | 2004-11-11 | 2006-05-11 | Reed Richard J | Multi compartment collapsible tank |
JP2006322738A (ja) * | 2005-05-17 | 2006-11-30 | Surpass Kogyo Kk | ダンパ |
FR2903064B1 (fr) * | 2006-06-30 | 2009-05-01 | Bosch Gmbh Robert | Circuit hydraulique de freinage |
US20100000920A1 (en) * | 2008-07-07 | 2010-01-07 | Ermanno Martinello | Membrane coating for a water pressurization Bladder |
PT2233844E (pt) † | 2009-03-14 | 2014-11-03 | Winkelmann Sp Z O O | Vaso de expansão por pressão de membrana |
DE102014000358A1 (de) * | 2014-01-09 | 2015-07-09 | Hydac Technology Gmbh | Druckspeicher |
US9670979B1 (en) | 2016-05-13 | 2017-06-06 | Liquidspring Technologies, Inc. | Resilient expandable pressure vessel |
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- 1989-08-31 EP EP89402381A patent/EP0360648B1/de not_active Expired - Lifetime
- 1989-08-31 DE DE8989402381T patent/DE68900297D1/de not_active Expired - Lifetime
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FR1479485A (fr) * | 1966-03-14 | 1967-05-05 | Genoud & Cie Ets | Procédé de fabrication de membrane de séparation pour distributeur de produits sous pression |
FR1494473A (fr) * | 1966-09-23 | 1967-09-08 | Daimler Benz Ag | Accumulateur de pression de préférence pour une suspension oléo-pneumatique de véhicules, en particulier de voitures automobiles |
FR2151371A5 (de) * | 1971-08-24 | 1973-04-13 | Feldmuehle Anlagen Prod | |
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Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9004560U1 (de) * | 1990-04-23 | 1991-08-22 | Bran + Luebbe GmbH, 2000 Norderstedt | Verbundmembran |
US5409041A (en) * | 1990-05-31 | 1995-04-25 | Nok Corporation | Laminated sheet |
DE4117411A1 (de) * | 1990-05-31 | 1991-12-05 | Nok Corp | Laminierter flaechenhafter koerper |
DE4117411C2 (de) * | 1990-05-31 | 1998-08-06 | Nok Corp | Membranelement und Speicherelement mit einem solchen Membranelement |
US5524671A (en) * | 1990-05-31 | 1996-06-11 | Nok Corporation | Laminated sheet |
FR2667118A1 (fr) * | 1990-09-26 | 1992-03-27 | Nok Corp | Vessie pour accumulateur. |
EP0482916A1 (de) * | 1990-10-23 | 1992-04-29 | Honda Giken Kogyo Kabushiki Kaisha | Speicher |
US5215124A (en) * | 1990-10-23 | 1993-06-01 | Honda Giken Kogyo Kabushiki Kaisha | Accumulator |
FR2669081A1 (fr) * | 1990-11-10 | 1992-05-15 | Bosch Gmbh Robert | Accumulateur hydropneumatique a vessie. |
DE4231927C2 (de) * | 1992-09-24 | 1998-07-02 | Hydac Technology Gmbh | Kunststoffmembran für Druckspeicher |
DE4231927A1 (de) * | 1992-09-24 | 1994-03-31 | Hydac Technology Gmbh | Kunststoffmembran, Verfahren zu ihrer Herstellung sowie ihre Verwendung |
EP0610637A1 (de) * | 1993-01-13 | 1994-08-17 | Automobiles Peugeot | Elastische, undurchlässige Membran |
US5645922A (en) * | 1993-01-13 | 1997-07-08 | Automobiles Peugeot | Impermeable elastic membrane |
FR2700375A1 (fr) * | 1993-01-13 | 1994-07-13 | Peugeot | Membrane élastique imperméable. |
FR2759755A1 (fr) * | 1997-02-17 | 1998-08-21 | Atochem Elf Sa | Membrane elastique impermeable aux gaz et accumulateur hydropneumatique equipe de cette membrane |
EP0858883A1 (de) * | 1997-02-17 | 1998-08-19 | Elf Atochem S.A. | Elastische, gasundurchlässige Membran und damit ausgestattete hydropneumatische Akkumulatoren |
EP0859156A1 (de) * | 1997-02-17 | 1998-08-19 | Automobiles Peugeot | Elastische, gasundurchlässige Membran und damit ausgestattete hydropneumatische Akkumulatoren |
FR2759743A1 (fr) * | 1997-02-17 | 1998-08-21 | Peugeot | Membrane elastique impermeable aux gaz et accumulateur hydropneumatique equipe de cette membrane |
US6058976A (en) * | 1997-02-17 | 2000-05-09 | Automobiles Peugeot | Gas-impermeable elastic membrane and hydropneumatic accumulator equipped with this membrane |
US6350529B1 (en) | 1997-02-17 | 2002-02-26 | Elf Atochem S.A. | Gas-impermeable elastic membrane and hydropnematic accumulator equipped with this measure |
WO2003085270A2 (de) * | 2002-04-10 | 2003-10-16 | Hydac Technology Gmbh | Hydrospeicher, vorzugsweise membranspeicher |
WO2003085270A3 (de) * | 2002-04-10 | 2005-05-12 | Hydac Technology Gmbh | Hydrospeicher, vorzugsweise membranspeicher |
US8539984B2 (en) | 2002-04-10 | 2013-09-24 | Hydac Technology Gmbh | Hydraulic accumulator, in particular a membrane accumulator |
EP2175205A1 (de) | 2008-10-09 | 2010-04-14 | Winkelmann Sp. z o.o. | Membrandruckausdehnungsgefäss |
Also Published As
Publication number | Publication date |
---|---|
FR2636638A1 (fr) | 1990-03-23 |
US5036110A (en) | 1991-07-30 |
FR2636638B1 (fr) | 1990-12-21 |
DE68900297D1 (de) | 1991-11-07 |
EP0360648B1 (de) | 1991-10-02 |
ES2027067T3 (es) | 1992-05-16 |
JP2744817B2 (ja) | 1998-04-28 |
JPH02127436A (ja) | 1990-05-16 |
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