WO2020003089A1 - Multilayer hose for pressurized fluids transportation - Google Patents
Multilayer hose for pressurized fluids transportation Download PDFInfo
- Publication number
- WO2020003089A1 WO2020003089A1 PCT/IB2019/055290 IB2019055290W WO2020003089A1 WO 2020003089 A1 WO2020003089 A1 WO 2020003089A1 IB 2019055290 W IB2019055290 W IB 2019055290W WO 2020003089 A1 WO2020003089 A1 WO 2020003089A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hose
- layer
- elastomeric material
- multilayer
- hose according
- Prior art date
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 27
- 239000013536 elastomeric material Substances 0.000 claims abstract description 25
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 239000004753 textile Substances 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000004718 silane crosslinked polyethylene Substances 0.000 claims abstract description 7
- -1 polyethylene Polymers 0.000 claims description 18
- 239000004698 Polyethylene Substances 0.000 claims description 16
- 229920000573 polyethylene Polymers 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 9
- 229920000459 Nitrile rubber Polymers 0.000 claims description 7
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 claims description 4
- 150000004756 silanes Chemical class 0.000 claims description 4
- 229920003052 natural elastomer Polymers 0.000 claims description 3
- 229920001194 natural rubber Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 claims description 3
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000004760 aramid Substances 0.000 claims description 2
- 229920006231 aramid fiber Polymers 0.000 claims description 2
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 63
- 239000000463 material Substances 0.000 description 14
- 238000004132 cross linking Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 230000016571 aggressive behavior Effects 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 150000002334 glycols Chemical class 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000914 Metallic fiber Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical class [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/02—Layer formed of wires, e.g. mesh
-
- 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
-
- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/06—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B15/085—Layered products comprising a layer of metal comprising metal 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 comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/10—Layered products comprising a layer of natural or synthetic rubber next to a fibrous or filamentary layer
-
- 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
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/12—Layered products comprising a layer of natural or synthetic rubber comprising natural rubber
-
- 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
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
-
- 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
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/024—Woven fabric
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- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
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- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
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- 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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0223—Vinyl resin fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0261—Polyamide fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
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- B32B2262/0269—Aromatic polyamide fibres
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- 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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0276—Polyester fibres
Definitions
- the present invention relates to a multilayer hose for pressurized fluids transportation.
- the present invention relates to a multilayer hose for transporting pressurized fluids, such as hydrocarbons (e.g. mineral oils, lubricants, glycols, etc.), which is preferably used in the sectors of hydraulic systems, industrial machines, handling machines, lifting machines .
- pressurized fluids such as hydrocarbons (e.g. mineral oils, lubricants, glycols, etc.)
- hydrocarbons e.g. mineral oils, lubricants, glycols, etc.
- multilayer hoses comprising from the interior to the exterior: an inner layer made of elastomeric material, placed in contact with the fluid to be transported; an intermediate reinforcing layer made of metallic or textile material and an outer layer of elastomeric material.
- the reinforcing layer has the mechanical function of counteracting the pressure exerted by the pressurized fluid transported, thus preventing the bursting of the hose, while the inner layer in elastomeric material has the characteristics of being impermeable and resistant to the aggression of the transported fluids.
- the outer layer acts as a protective layer to the inner layers.
- hybrid multilayer hoses comprising an inner layer of elastomeric material, an intermediate reinforcing layer made of metallic or textile material and an outer layer made of thermoplastic material .
- EP 2290278 describes a multilayer hose comprising an inner layer made of elastomeric material, one or more intermediate reinforcing braided or spiralized layers made of metallic or textile material and an outer layer made of thermoplastic material, such as polyurethane.
- the temperature range within which it is possible to use a multilayer hose mainly depends on the material with which the inner and outer layers are made. In fact each material, whether elastomeric or thermoplastic, has its own temperature range within which its performance remains constant. At temperatures outside the aforementioned range the material can degrade, for example by melting, thus making its use at those temperatures inadequate.
- a hybrid multilayer hose comprising an inner elastomeric layer and an outer polyurethane layer has the limitation that it cannot be used at relatively high temperatures, for example above about 80 °C, since beyond that temperature the polyurethane begins to deteriorate .
- hoses whose performance is correctly maintained at low temperatures have the disadvantage of losing the aforementioned performance when the temperature rises and, conversely, hoses that operate correctly at high temperatures have poor performance at low temperatures.
- the Applicant has therefore posed the problem of developing a multilayer hose for transporting pressurized fluids that is suitable for use in a wide range of temperatures, for example from -60°C to +150°C.
- a hybrid multilayer hose in which the inner layer is made of elastomeric material and the outer layer is composed of a polymeric material comprising silane crosslinked polyethylene; at least one intermediate reinforcing layer comprising metal wires or textile fibers is interposed between the two layers.
- the present invention therefore relates to a multilayer hose for pressurized fluids transportation which comprises, from the interior to the exterior:
- an inner layer comprising a vulcanized elastomeric material
- At least one reinforcing layer comprising a plurality of metal wires and/or textile fibers
- the present invention relates to the use of the aforesaid multilayer hose for transporting a pressurized fluid.
- pressurized fluids are meant as fluids circulating in a hose at a pressure in the range of 20 - 1300 bar.
- the pressurized fluids transported are selected from: hydrocarbons, mineral oils, lubricants, glycols, water and similar fluids.
- the elastomeric material forming the inner layer can be chosen without particular limitations among the elastomeric materials commonly used to make the multilayer hoses of the prior art.
- the elastomeric material can be a natural rubber or a vulcanizable synthetic rubber, such as for example nitrile rubber, styrene-butadiene rubber (SBR), butadiene-acrylonitrile copolymers (NBR) , chlorobutadiene polymers (neoprene®) . More preferably, the elastomeric material is a butadiene-acrylonitrile copolymer .
- the elastomeric material forming the inner layer is in a vulcanized form.
- the inner layer delimits, internally with respect to the hose, a cavity for pressurized fluids transportation.
- cavity it is meant the lumen or channel of the hose available for the passage of the transported fluid.
- the diameter of this cavity namely the diameter of its cross-section, is within the range from 3/16 inch to 2 inches.
- the inner layer is therefore in direct contact with the transported fluid, namely it is the innermost layer of the hose.
- the elastomeric material preferably has a hardness value within the range from 60 to 95 Shore A (UNI EN ISO).
- the elastomeric material preferably has a breaking load value within the range from 5 to 30 MPa (UNI 6065) .
- the elastomeric material preferably has an elongation at break value within the range from 100 to 300% (UNI 6065) .
- the elastomeric material preferably has a modulus value 100% within the range from 1.0 to 15.0 MPa (UNI 6065) .
- the multilayer hose comprises one or more reinforcing layers (or sheaths), each comprising metal wires or textile fibers.
- the metal wires are preferably braided or spiralized.
- the textile fibers are preferably braided or spiralized.
- the metallic fibers are made of iron, while the textile fibers are preferably selected from: aramid fibers, nylon fibers, polyvinyl alcohol fibers, polyester fibers and combinations thereof.
- the at least one reinforcing layer surrounding the inner layer is arranged to increase the mechanical strength of the multilayer hose; in particular, the at least one reinforcing layer is chosen so as to allow the hose to meet the burst strength requirements established by the specific industry standards.
- the reinforcing layer can comprise one or more of the following elements: a sheath of possibly braided or spiralized steel wires or textile fibers.
- the reinforcing layer can also comprise several braided or spiralized sheaths, possibly superimposed on one another and formed for example by braided metallic wires or textile fibers.
- a thin layer of natural or synthetic rubber is preferably interposed, referred to in jargon as a "foil", and having the purpose of increasing the adhesion of the two or more sheaths .
- the reinforcing layer is able to adhere to the inner and outer layers, allowing the layers to be mechanically fixed and avoid reciprocal sliding.
- the reinforcing layer and the possible sheaths can be impregnated by the elastomeric material of the inner layer and/or by the polyethylene of the outer layer, for example following the manufacturing process of the multilayer hose by extrusion. This further improves the adhesion of the various layers to each other.
- the outer layer surrounding the at least one reinforcing layer of the multilayer hose according to the present invention is made of a material comprising silane crosslinked polyethylene.
- the polyethylene which can be used for the purposes of the present invention preferably has a hardness value within the range from 60 to 95 Shore A (UNI EN ISO 868) .
- the polyethylene preferably has a breaking load value greater than 5, more preferably within the range from 5 to 30 MPa (ISO 527-2) .
- the polyethylene preferably has an elongation at break value greater than 400%, more preferably within the range from 400% to 800% (ISO 527-2) .
- the polyethylene preferably has a 100% modulus value within the range from 1.0 to 15.0 MPa (ISO 527-2) .
- the outer layer of the silane crosslinked polyethylene hose advantageously has a thickness within the range from 0.2 to 1.5 mm, even more preferably it has a thickness within the range from 0.3 to 1.0 mm.
- This thickness of the crosslinked polyethylene layer gives the hose adequate mechanical and thermal resistance, without making the hose too stiff, which therefore maintains adequate flexibility, or significantly increasing its weight.
- the thickness of the layers forming the multilayer hose according to the present invention can be measured by means of a calliper.
- the multilayer hoses according to the present invention can be used continuously at temperatures in a wide range of values, for example within the range from -55°C to +145°C.
- the term "continuously" means that the hose can operate indefinitely and continuously at the aforementioned temperatures. Moreover, when used for a short period of time, the multilayer hose can also be used at a lower temperature, such as for example at -60°C, or at a higher temperature, such as for example at +150°C.
- the characteristic of the outer layer having a thickness within the range from 0.2 to 1.5 mm also allows the weight per unit of length of the multilayer hose to be reduced with respect to the multilayer hoses of the known art.
- the weight reduction advantageously makes the hose of the invention easy to handle.
- the multilayer hose according to the present invention can be made with the devices and techniques known to the person skilled in the art.
- the multilayer hose is preferably produced with a process that comprises the steps of:
- the vulcanization is carried out in an autoclave in the presence of steam.
- the silane crosslinking of the polyethylene can be carried out with the processes known to the person skilled in the art, preferably with the process commonly called Sioplast®.
- a polyethylene polymer grafted with a vinylsilane compound e.g. vinyltrimethoxysilane
- at least one hydrolysis catalyst and other additives e.g. pigments, plasticizers, etc.
- the crosslinking of the polyethylene can take place in environmental conditions.
- the crosslinking can be accelerated by immersing the hose comprising the polyethylene layer in hot water (e.g. 60-95°C).
- the polyethylene grafted with vinylsilane compounds can be prepared according to the prior art, for example by treating the polyethylene with an alkoxyvinylsilane compound in a mixing unit (e.g. twin-screw extruder or co-kneader), at a temperature for example of 50 - 150°C, in the presence of a peroxidic compound capable of promoting the anchoring of the alkoxyvinylsilane groups to the polyethylene chains (radical initiator) .
- a mixing unit e.g. twin-screw extruder or co-kneader
- the production process according to the present invention has the advantage to allow the production of a multilayer hose with a particularly favourable balance between performance and production costs, in particular with respect to the processes that involve the crosslinking with peroxides of thermoplastic polymeric materials.
- these latter processes require expensive systems and the strict control of operating conditions, in particular of the extrusion temperature, so as to avoid triggering the decomposition of the peroxides and therefore the beginning of the crosslinking .
- a further aspect of the present invention relates to the use of the multilayer hose, as previously described, for transporting a pressurized fluid, preferably at a temperature within the range from -60°C to +150 °C .
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Pipeline Systems (AREA)
Abstract
Multilayer hose for pressurized fluids transportation which comprises, from the interior to the exterior: an inner layer comprising a vulcanized elastomeric material; at least one reinforcing layer comprising a plurality of metal wires or textile fibers; an extruded outer layer comprising silane crosslinked polyethylene. The multilayer hose has the advantage of being a light, flexible hose suitable for use within a wide range of temperatures, such as for example from -55°C to +145°C.
Description
MULTILAYER HOSE FOR PRESSURIZED FLUIDS TRANSPORTATION
The present invention relates to a multilayer hose for pressurized fluids transportation. In particular, the present invention relates to a multilayer hose for transporting pressurized fluids, such as hydrocarbons (e.g. mineral oils, lubricants, glycols, etc.), which is preferably used in the sectors of hydraulic systems, industrial machines, handling machines, lifting machines .
It is well known that, in order to allow an adequate transport of fluids, especially when these are pressurized oily fluids or hydrocarbons, it is necessary to use a multilayer hose provided with specific structural and chemical-physical characteristics. The material that constitutes the layer of the hose in direct contact with the transported fluid must in fact be highly impermeable to oils and hydrocarbons, besides being highly resistant to the aggression by the components constituting the transported fluid. Known multilayer hoses for pressurized fluids transportation, besides having such chemical resistance must also have high mechanical performance, for example high resistance to bursting due to an increase in internal pressure, to compression and to impact. Finally, these hoses must be flexible so that they can be handled with a certain ease during both production and use and can be wound onto reels for the storage and transport thereof.
There are numerous combinations of materials proposed in the prior art for producing multilayer hoses for applications in the aforementioned fields.
For example, multilayer hoses are known comprising from the interior to the exterior: an inner layer made
of elastomeric material, placed in contact with the fluid to be transported; an intermediate reinforcing layer made of metallic or textile material and an outer layer of elastomeric material.
Usually the reinforcing layer has the mechanical function of counteracting the pressure exerted by the pressurized fluid transported, thus preventing the bursting of the hose, while the inner layer in elastomeric material has the characteristics of being impermeable and resistant to the aggression of the transported fluids. The outer layer, on the other hand, acts as a protective layer to the inner layers.
Also known are the so-called hybrid multilayer hoses comprising an inner layer of elastomeric material, an intermediate reinforcing layer made of metallic or textile material and an outer layer made of thermoplastic material .
An example of these hybrid multilayer hoses is described in EP 2290278, which describes a multilayer hose comprising an inner layer made of elastomeric material, one or more intermediate reinforcing braided or spiralized layers made of metallic or textile material and an outer layer made of thermoplastic material, such as polyurethane.
The temperature range within which it is possible to use a multilayer hose mainly depends on the material with which the inner and outer layers are made. In fact each material, whether elastomeric or thermoplastic, has its own temperature range within which its performance remains constant. At temperatures outside the aforementioned range the material can degrade, for example by melting, thus making its use at those
temperatures inadequate.
Depending on the temperatures within which the hose is to be used, it is therefore necessary to choose a particular combination of materials for the inner and outer layers, so as to make the hose suitable for use in those specific temperatures.
For example, a hybrid multilayer hose comprising an inner elastomeric layer and an outer polyurethane layer has the limitation that it cannot be used at relatively high temperatures, for example above about 80 °C, since beyond that temperature the polyurethane begins to deteriorate .
In general, hoses whose performance is correctly maintained at low temperatures have the disadvantage of losing the aforementioned performance when the temperature rises and, conversely, hoses that operate correctly at high temperatures have poor performance at low temperatures. This limits the choice of the type of hose to be installed to the temperature range of use and imposes the user to install hoses with different structures and compositions for different temperature ranges of use.
Instead, it would be desirable to have multilayer hoses available capable of being used indifferently at low or high temperatures, i.e. in a wider temperature range than that of the hoses of the prior art.
The Applicant has therefore posed the problem of developing a multilayer hose for transporting pressurized fluids that is suitable for use in a wide range of temperatures, for example from -60°C to +150°C.
The Applicant has now found that this problem, and others which will be better explained below, can be
solved by a hybrid multilayer hose in which the inner layer is made of elastomeric material and the outer layer is composed of a polymeric material comprising silane crosslinked polyethylene; at least one intermediate reinforcing layer comprising metal wires or textile fibers is interposed between the two layers.
In fact, it has been found that the use of a polymeric material comprising silane crosslinked polyethylene as the outer layer allows to obtain hoses usable in a wider range of temperatures. The hoses also maintain high flexibility and are significantly lighter than the hoses of the prior art, in particular than hoses having inner and outer layers of elastomeric material, with the same required performance. In fact, crosslinked polyethylene provides adequate mechanical and thermal resistance despite being used in the form of a thin layer. Furthermore, by crosslinking polyethylene by means of the "silane" technique, the production process is easy and low-cost to implement.
According to a first aspect, the present invention therefore relates to a multilayer hose for pressurized fluids transportation which comprises, from the interior to the exterior:
- an inner layer comprising a vulcanized elastomeric material;
- at least one reinforcing layer comprising a plurality of metal wires and/or textile fibers;
- an extruded outer layer comprising silane crosslinked polyethylene.
According to a second aspect, the present invention relates to the use of the aforesaid multilayer hose for transporting a pressurized fluid.
Within the scope of the present description and the appended claims, "pressurized" fluids are meant as fluids circulating in a hose at a pressure in the range of 20 - 1300 bar.
Preferably, the pressurized fluids transported are selected from: hydrocarbons, mineral oils, lubricants, glycols, water and similar fluids.
The elastomeric material forming the inner layer can be chosen without particular limitations among the elastomeric materials commonly used to make the multilayer hoses of the prior art. The elastomeric material can be a natural rubber or a vulcanizable synthetic rubber, such as for example nitrile rubber, styrene-butadiene rubber (SBR), butadiene-acrylonitrile copolymers (NBR) , chlorobutadiene polymers (neoprene®) . More preferably, the elastomeric material is a butadiene-acrylonitrile copolymer .
The elastomeric material forming the inner layer is in a vulcanized form.
The inner layer delimits, internally with respect to the hose, a cavity for pressurized fluids transportation. For the purpose of the present description, by cavity it is meant the lumen or channel of the hose available for the passage of the transported fluid. Preferably, the diameter of this cavity, namely the diameter of its cross-section, is within the range from 3/16 inch to 2 inches. The inner layer is therefore in direct contact with the transported fluid, namely it is the innermost layer of the hose.
The elastomeric material preferably has a hardness value within the range from 60 to 95 Shore A (UNI EN ISO
The elastomeric material preferably has a breaking load value within the range from 5 to 30 MPa (UNI 6065) .
The elastomeric material preferably has an elongation at break value within the range from 100 to 300% (UNI 6065) .
The elastomeric material preferably has a modulus value 100% within the range from 1.0 to 15.0 MPa (UNI 6065) .
In accordance with one embodiment of the present invention, the multilayer hose comprises one or more reinforcing layers (or sheaths), each comprising metal wires or textile fibers. The metal wires are preferably braided or spiralized. According to another embodiment of the invention, the textile fibers are preferably braided or spiralized.
Preferably, the metallic fibers are made of iron, while the textile fibers are preferably selected from: aramid fibers, nylon fibers, polyvinyl alcohol fibers, polyester fibers and combinations thereof.
The at least one reinforcing layer surrounding the inner layer is arranged to increase the mechanical strength of the multilayer hose; in particular, the at least one reinforcing layer is chosen so as to allow the hose to meet the burst strength requirements established by the specific industry standards.
The reinforcing layer can comprise one or more of the following elements: a sheath of possibly braided or spiralized steel wires or textile fibers. The reinforcing layer can also comprise several braided or spiralized sheaths, possibly superimposed on one another and formed for example by braided metallic wires or textile fibers. In this case, between two successive
sheaths a thin layer of natural or synthetic rubber is preferably interposed, referred to in jargon as a "foil", and having the purpose of increasing the adhesion of the two or more sheaths .
Preferably the reinforcing layer is able to adhere to the inner and outer layers, allowing the layers to be mechanically fixed and avoid reciprocal sliding.
Advantageously, the reinforcing layer and the possible sheaths can be impregnated by the elastomeric material of the inner layer and/or by the polyethylene of the outer layer, for example following the manufacturing process of the multilayer hose by extrusion. This further improves the adhesion of the various layers to each other.
The outer layer surrounding the at least one reinforcing layer of the multilayer hose according to the present invention is made of a material comprising silane crosslinked polyethylene.
The polyethylene which can be used for the purposes of the present invention preferably has a hardness value within the range from 60 to 95 Shore A (UNI EN ISO 868) .
The polyethylene preferably has a breaking load value greater than 5, more preferably within the range from 5 to 30 MPa (ISO 527-2) .
The polyethylene preferably has an elongation at break value greater than 400%, more preferably within the range from 400% to 800% (ISO 527-2) .
The polyethylene preferably has a 100% modulus value within the range from 1.0 to 15.0 MPa (ISO 527-2) .
In accordance with a preferred embodiment, the outer layer of the silane crosslinked polyethylene hose advantageously has a thickness within the range from 0.2
to 1.5 mm, even more preferably it has a thickness within the range from 0.3 to 1.0 mm. This thickness of the crosslinked polyethylene layer gives the hose adequate mechanical and thermal resistance, without making the hose too stiff, which therefore maintains adequate flexibility, or significantly increasing its weight.
The thickness of the layers forming the multilayer hose according to the present invention can be measured by means of a calliper.
In particular, the multilayer hoses according to the present invention can be used continuously at temperatures in a wide range of values, for example within the range from -55°C to +145°C.
For the purposes of the present description and the appended claims, the term "continuously" means that the hose can operate indefinitely and continuously at the aforementioned temperatures. Moreover, when used for a short period of time, the multilayer hose can also be used at a lower temperature, such as for example at -60°C, or at a higher temperature, such as for example at +150°C.
The characteristic of the outer layer having a thickness within the range from 0.2 to 1.5 mm also allows the weight per unit of length of the multilayer hose to be reduced with respect to the multilayer hoses of the known art. The weight reduction advantageously makes the hose of the invention easy to handle.
The multilayer hose according to the present invention can be made with the devices and techniques known to the person skilled in the art.
In accordance with a further aspect of the present invention, the multilayer hose is preferably produced
with a process that comprises the steps of:
a) extruding an annular inner layer of elastomeric material ;
b) applying on said annular inner layer at least one reinforcing layer comprising metal wires and/or textile fibers;
c) subjecting said annular inner layer and said at least one reinforcing layer to vulcanization in order to vulcanize said elastomeric material;
d) extruding an annular outer layer comprising at least one polyethylene grafted with silanes on said reinforcing layer;
e) curing said polyethylene grafted with silanes in order to obtain the multilayer hose.
Preferably, the vulcanization is carried out in an autoclave in the presence of steam.
The silane crosslinking of the polyethylene can be carried out with the processes known to the person skilled in the art, preferably with the process commonly called Sioplast®. In accordance with the Sioplast® process, a polyethylene polymer grafted with a vinylsilane compound (e.g. vinyltrimethoxysilane ) , optionally pre-mixed with at least one hydrolysis catalyst and other additives (e.g. pigments, plasticizers, etc.), is extruded on the reinforcing layer to form the outer layer. The crosslinking of the polyethylene can take place in environmental conditions. Preferably, the crosslinking can be accelerated by immersing the hose comprising the polyethylene layer in hot water (e.g. 60-95°C).
The polyethylene grafted with vinylsilane compounds can be prepared according to the prior art, for example
by treating the polyethylene with an alkoxyvinylsilane compound in a mixing unit (e.g. twin-screw extruder or co-kneader), at a temperature for example of 50 - 150°C, in the presence of a peroxidic compound capable of promoting the anchoring of the alkoxyvinylsilane groups to the polyethylene chains (radical initiator) .
The production process according to the present invention has the advantage to allow the production of a multilayer hose with a particularly favourable balance between performance and production costs, in particular with respect to the processes that involve the crosslinking with peroxides of thermoplastic polymeric materials. In fact, these latter processes require expensive systems and the strict control of operating conditions, in particular of the extrusion temperature, so as to avoid triggering the decomposition of the peroxides and therefore the beginning of the crosslinking .
A further aspect of the present invention relates to the use of the multilayer hose, as previously described, for transporting a pressurized fluid, preferably at a temperature within the range from -60°C to +150 °C .
Claims
1. Multilayer hose for pressurized fluids transportation which comprises, from the interior to the exterior :
- an inner layer comprising a vulcanized elastomeric material;
- at least one reinforcing layer comprising a plurality of metal wires and/or textile fibers;
- an extruded outer layer comprising silane crosslinked polyethylene.
2. Hose according to claim 1, wherein the elastomeric material is selected from: natural rubber, nitrile rubber, styrene-butadiene rubber, butadiene- acrylonitrile copolymer, chlorobutadiene polymers.
3. Hose according to claim 2, wherein the elastomeric material is a butadiene-acrylonitrile copolymer .
4. Hose according to any one of the preceding claims, wherein the metal wires and/or the textile fibers are braided or spiralized.
5. Hose according to any one of the preceding claims, wherein the metal wires are steel wires.
6. Hose according to any one of claims from 1 to 4, wherein the textile fibers are selected from: aramid fibers, nylon fibers, polyvinyl alcohol fibers, polyester fibers and combinations thereof.
7. Hose according to any one of the preceding claims, wherein the outer layer has a thickness within the range from 0.2 to 1.5 mm.
8. Hose according to any one of the preceding claims, wherein the inner layer delimits, internally with respect to the hose, a cavity for the transportation
of pressurized fluids having a diameter within the range from 3/16 inch to 2 inches.
9. Process to produce a multilayer hose according to claim 1 comprising the steps of:
a) extruding an annular inner layer of elastomeric material ;
b) applying on said annular inner layer at least one reinforcing layer comprising metal wires and/or textile fibers;
c) subjecting said annular inner layer and said at least one reinforcing layer to vulcanization in order to vulcanize said elastomeric material;
d) extruding an annular outer layer comprising at least one polyethylene grafted with silanes on said reinforcing layer;
e) curing said polyethylene grafted with silanes in order to obtain said multilayer hose.
10. Use of the multilayer hose according to claim 1 for the transportation of a pressurized fluid.
11. Use according to claim 10 at a temperature within the range from -60°C to +150°C.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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IT102018000006714 | 2018-06-27 | ||
IT102018000006714A IT201800006714A1 (en) | 2018-06-27 | 2018-06-27 | MULTI-LAYER PIPE FOR THE TRANSPORT OF PRESSURE FLUIDS. |
Publications (1)
Publication Number | Publication Date |
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WO2020003089A1 true WO2020003089A1 (en) | 2020-01-02 |
Family
ID=63684280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/IB2019/055290 WO2020003089A1 (en) | 2018-06-27 | 2019-06-24 | Multilayer hose for pressurized fluids transportation |
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IT (1) | IT201800006714A1 (en) |
WO (1) | WO2020003089A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022172723A1 (en) * | 2021-02-10 | 2022-08-18 | 横浜ゴム株式会社 | Hose for fluid transportation |
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US4238260A (en) * | 1978-11-13 | 1980-12-09 | Parker-Hannifin Corporation | Method of making an elastomeric hose |
JP2004150460A (en) * | 2002-10-28 | 2004-05-27 | Tokai Rubber Ind Ltd | Hose |
JP2010144907A (en) * | 2008-12-22 | 2010-07-01 | Mitsubishi Plastics Inc | Resin pipe for water supply and hot water supply |
US20120292077A1 (en) * | 2011-05-20 | 2012-11-22 | Hitachi Cable, Ltd. | Resin composition, and wire and cable using the same |
WO2016004204A1 (en) * | 2014-07-02 | 2016-01-07 | Cooper-Standard Automotive Inc. | Hose, abrasion resistant composition, and process of making a hose |
US20180163901A1 (en) * | 2016-12-10 | 2018-06-14 | Cooper-Standard Automotive Inc. | Hoses, compositions, and methods of making the same |
-
2018
- 2018-06-27 IT IT102018000006714A patent/IT201800006714A1/en unknown
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2019
- 2019-06-24 WO PCT/IB2019/055290 patent/WO2020003089A1/en active Application Filing
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Publication number | Priority date | Publication date | Assignee | Title |
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US4238260A (en) * | 1978-11-13 | 1980-12-09 | Parker-Hannifin Corporation | Method of making an elastomeric hose |
JP2004150460A (en) * | 2002-10-28 | 2004-05-27 | Tokai Rubber Ind Ltd | Hose |
JP2010144907A (en) * | 2008-12-22 | 2010-07-01 | Mitsubishi Plastics Inc | Resin pipe for water supply and hot water supply |
US20120292077A1 (en) * | 2011-05-20 | 2012-11-22 | Hitachi Cable, Ltd. | Resin composition, and wire and cable using the same |
WO2016004204A1 (en) * | 2014-07-02 | 2016-01-07 | Cooper-Standard Automotive Inc. | Hose, abrasion resistant composition, and process of making a hose |
US20180163901A1 (en) * | 2016-12-10 | 2018-06-14 | Cooper-Standard Automotive Inc. | Hoses, compositions, and methods of making the same |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2022172723A1 (en) * | 2021-02-10 | 2022-08-18 | 横浜ゴム株式会社 | Hose for fluid transportation |
JP2022122718A (en) * | 2021-02-10 | 2022-08-23 | 横浜ゴム株式会社 | Hose for fluid transportation |
JP7211442B2 (en) | 2021-02-10 | 2023-01-24 | 横浜ゴム株式会社 | hose for fluid transport |
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