EP3553794B1 - Method to limit corrosion and deterioration of wires and cables of ferrous metal and their alloys - Google Patents

Method to limit corrosion and deterioration of wires and cables of ferrous metal and their alloys Download PDF

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Publication number
EP3553794B1
EP3553794B1 EP19168246.7A EP19168246A EP3553794B1 EP 3553794 B1 EP3553794 B1 EP 3553794B1 EP 19168246 A EP19168246 A EP 19168246A EP 3553794 B1 EP3553794 B1 EP 3553794B1
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EP
European Patent Office
Prior art keywords
compound
coating
wire
application
curing
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.)
Active
Application number
EP19168246.7A
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German (de)
English (en)
French (fr)
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EP3553794A1 (en
Inventor
Angelo Corso
Giorgio Corso
David Roy Pawloski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lubrimetal SpA
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Lubrimetal SpA
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Priority claimed from IT102018000004462A external-priority patent/IT201800004462A1/it
Application filed by Lubrimetal SpA filed Critical Lubrimetal SpA
Publication of EP3553794A1 publication Critical patent/EP3553794A1/en
Priority to ARP200100984A priority Critical patent/AR118620A1/es
Application granted granted Critical
Publication of EP3553794B1 publication Critical patent/EP3553794B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • H01B19/04—Treating the surfaces, e.g. applying coatings

Definitions

  • the present invention relates to a method to limit corrosion and deterioration by forming a solid polymeric coating on the surface of metal wires of ferrous metals and their alloys with a section of any shape and size and cables formed by stranded wires of ferrous metals and their alloys.
  • Said method includes a first step of application of the liquid or solid state compound and a second step of curing such compound through the application of an amount of ultraviolet radiation, sufficient to trigger the cross-linking polymerisation which causes the solidification of the compound and the consequent formation of a coating with features of flexibility, elongation, hardness and adhesion, such as to ensure high protective capacity and/or with lubricant features.
  • Coatings are used to decorate wires and cables and to protect them from deterioration factors, deriving from oxidation, from chemical and environmental agents, such as corrosion in marine environments, as well as by other aging factors, prolonging the useful life of the wires and cables themselves.
  • Wires and cables coatings may also have other purposes.
  • An example is that of the drawing and/or rolling of metal (ferrous) and their alloys wire rod and/or wire, having sections of any shape or size. This process, known since a long time, consists in reducing the section of the wire rod and/or wire by deformation, without removing any material.
  • the rod and/or the wire is passed inside of arrays of material of appropriate hardness, commonly called dies, the section of which negatively reproduces the shape and the size of the cross section of the wire rod and/or wire to be obtained.
  • One or more steps can be provided through the dies and through one or more machines. These steps create friction on the wire rod or on the wire, with consequent heating of these and with possible consequent breakages. For this reason, the surface of the wire rod and/or the wire must be lubricated, so as to reduce the friction and therefore the heating and the breakage.
  • lubricants are generally used, such as stearates, which are solid at room temperature (dry lubrication), or oils that are liquids (bath lubrication). The dry lubricant is applied on the wire rod and/or on the wire, while bath lubrication involves dipping the die into the lubricant.
  • the wire rod and/or the wire are deformed by rollers which exert a mechanical pressure on the wire rod and/or wire.
  • a second method called rolling
  • the wire rod and/or the wire are deformed by rollers which exert a mechanical pressure on the wire rod and/or wire.
  • only dry lubrication occurs, similarly to what has already been seen for the first method.
  • Another purpose is to limit corrosion and deterioration of the wire rod and/or wire, protecting them from air and moisture with a barrier effect.
  • the polymeric compounds used nowadays for these purposes are self-supporting plastic coatings, made by applying to the surface powders and/or polymerising materials, which are subsequently solidified by means of a thermal process.
  • the execution of this thermal curing process requires the use of bulky and expensive systems.
  • WO2010/112 493 discloses the coating of electric wires with a composition, comprising a urethane (meth)acrylate, having two or more structural parts derived from an aliphatic polyol, a compound having a cyclic structure and one ethylenically unsaturated group, a group containing phosphorous.
  • US2015/368 496 discloses a coating composition including a polymer binding, one or more hydrophobic silicon dioxide compositions and one or more UV protecting agents.
  • US 3 813 322 discloses a curable composition for coating electric cables
  • the object of the present invention is to provide a coating of metal wires, cables or wire rods, both for decorative purposes and for protective purposes, as well as lubricant for drawing, rolling or similar processes and, at the same time, clearing the VOC emission, whilst also avoiding the formation of industrial waste, to be achieved with less bulky equipment and systems, characterised by a low initial economical investment and low costs in terms of energy resources.
  • the wires and cables are presented in the form of a coil, both inbound and outbound from the process: not excluding different possibilities, such as the application of the coating on the wires and cables of rectilinear shape.
  • the industrial applications of the invention relate to the coating of wires and cables used in multiple fields of industrial production, in order both to ensure high standards of protection of the wires and cables from deterioration factors, such as oxidation and the corrosive action of chemical and environmental agents, and to obtain decorating colouring of the surface, and to superficially apply a lubricant for the subsequent processing (extrusion, rolling, etc.).
  • the process comprises two sequential operational steps, passing the wire or cable inside two or more serial operating units, one or more for each step, or within one or more operating units, within each of which the two steps are carried out in sequence.
  • the first step consists in the physical application of a compound on the outer surface.
  • This application is obtained by passing the wire or the cable in the operating units where the operation took place in a manner known per se.
  • the wire or cable runs inside of machines and production lines, adapted to perform the two steps, without the constraints of direction, if not those determined by the layout of the machines and of the production lines themselves.
  • the compound is formed from monomers and/or oligomers and/or polymers and/or other additives and photoinitiators, it is present in liquid or solid form (powders and solid particles of various size and shape) and is applied to the wire or to the cable with different techniques, known per se.
  • one or more may preferably be chosen among (the compounds in brackets are just some examples of compounds belonging to the general categories): oligomers (acrylated urethanes, acrylated polyesters, aliphatic and aromatic epoxy acrylates, unsaturated polyesters, amino functionalised acrylated oligomers, silicone acrylates) monomers (low molecular weight acrylates, vinyl ethers, vinyl esters, propenyl esters, acrylic acid, vinyl phosphonates, vinyl sulfonic acid, fumaric acid, itaconic acid, thiols), photoinitiators, synergists (amines, boranes, thiols, silanes), organic and inorganic pigments, fillers and additives (silica nanoparticles, alumina, sucrose benzoate, boron nitride, polyolefin waxes, metal soaps, zinc stearate, aluminium stearate, polytetrafluor
  • All these compounds have a high capacity of polymerisation and cross-linking when irradiated with light of appropriate wavelengths and, under such conditions, do not release volatile substances harmful to health and to the environment.
  • polymers that are obtained have a high capacity of corrosion protection and lubrication.
  • the compound is present in the liquid state, it is applied by directly contacting the wire or cable with the compound in the liquid state and calibrated through one or more dies, to obtain a uniform thickness on the surface using the following industrial technologies: passage through one or more dies, vacuum applicators, spray systems, mats, roller applicators, pressure dies, all easily available, having a reasonable encumbrance and often already present at the company premises.
  • the compound is in the solid state, it is applied by directly contacting the wire or cable with the compound in the solid state in the form of powders and solid particles of various shapes and sizes and calibrated through one or more dies, to obtain a uniform thickness on the surface using industrial technologies known such as, but not limited to: passage through one or more dies, application of electrostatic charge to the wire or cable, passage through one or more pressure dies, fluidised beds, all easily available, having a reasonable encumbrance and often already present in the company.
  • the second step consists in the cross-linking polymerisation of the compound applied with the previously disclosed modes.
  • the cross-linking polymerisation transforms the compound applied in a solid polymer, the composition of which allows to ensure high standards of protection of the wires and cables from deterioration factors derived from oxidation, from chemical and environmental factors, for example corrosion in marine environments, as well as from other aging factors, thereby extending their useful life. Different compounds are applied for specific protection requirements. Alternatively, such polymers can have high lubricating capacity, allowing the coated material to undergo the main machining operations without overheating or breakages.
  • This coating is transparent or coloured.
  • the decorative aspect results from the possibility to use the compounds of various colours.
  • the cross-linking polymerisation is obtained by irradiating the wire or the cable or the wire rod, coated during the first step, with ultraviolet radiation generated by one or more radiating elements, possibly with the aid of reflectors that allow to optimise the irradiation and that use industrial technologies, such as arc technology, microwave technology, LED technologies.
  • said ultraviolet light has a wavelength ranging between 150 and 400 nm, most preferably between 250 and 400 nm. Within these ranges, the polymerisation is very fast.
  • the cross-linking polymerisation can be facilitated by limiting the presence of oxygen through the use of inert gases in the environment where the radiation takes place and the consequent cross-linking polymerisation reaction, since oxygen is an inhibitor of such a reaction.
  • Ultraviolet radiation can have different wavelengths even within a single cross-linking polymerisation process. This is linked to the type of photoinitiators chosen and ultimately to the features to be obtained for the coating.
  • the process of application and curing of the compound for forming the coating occurs in an environment where inert gases are present in high percentage, so as to obtain optimum results.
  • the metal wire or cable enters a tunnel, wherein the ultraviolet radiation irradiate the compound surface by 360°.
  • the components of the polymer compound react with the free radicals from the photoinitiators, triggering the cross-linking polymerisation.
  • fig. 1 which is a schematic view of a preferable embodiment, relating to the application of the coating on a metal wire immediately downstream of the drawing process
  • the uncoated wire or wire rod (1) in form of a coil passes through any type and kind of drawing machine (2), is drawn (3), is passed inside the operating unit where the compound (4) is applied and immediately enters the operating unit where the cross-linking polymerisation induced by ultraviolet radiation (5) occurs, then the coated wire is rewound into coils (6), according to a known mechanical process.
  • FIG. 2 it is a schematic view of a preferred embodiment, regarding the application of a coating on a metal wire in the form of coil wire, already previously drawn.
  • the coil of uncoated metal wire (7) is passed inside the operating unit where the compound (8) is applied and immediately enters the operating unit where the cross-linking polymerisation induced by ultraviolet radiation (9) occurs, then the coated wire is rewound in coils (10), according to a known mechanical process.
  • Fig. 3 is a schematic view of a preferred embodiment, regarding the application of a coating on a metal wire in the form of wire coils, already previously drawn.
  • the coil of uncoated wire (11) is passed in vertical direction inside the operating unit where the compound (12) is applied and immediately enters the operating unit where the cross-linking polymerisation induced by ultraviolet radiation (13) occurs, then the coated wire is rewound in coils (14), according to a known mechanical process.
  • FIG. 4 it is a schematic view of a preferable embodiment, concerning the application of the coating on a wire or a cable, wherein the wire or cable in the form of coil (15) is made to pass inside the operating unit where the compound (16) is applied and immediately enters the operating unit where the cross-linking polymerisation, induced by ultraviolet radiation (17), occurs. Then the coated wires or cables (18) undergo the process of final mechanical forming cable (19) which is rewound in coils (20), according to a mechanical process known.
  • fig. 5 is a schematic view of a preferable embodiment, relating to the application of the coating downstream of the wire forming process, wherein a wire in form of a coil (21) is mechanically formed (22) and is passed inside the operating unit where the compound (23) is applied and immediately enters the operating unit where the cross-linking polymerisation induced by ultraviolet radiation (24) occurs, then the coated wire is rewound into coils (25) according to a known mechanical process.
  • Fig. 6 is a schematic view of a preferred embodiment, regarding the application of the coating on a metal cable in coil.
  • the coil of uncoated metal cable (26) is passed inside the operating unit where the compound (27) is applied and immediately enters the operating unit where the cross-linking polymerisation induced by ultraviolet radiation (28) occurs, then the coated cable is rewound in coils (29) according to a known mechanical process.
  • FIG. 7 there is a schematic view of a preferred embodiment, regarding the application of a coating on a metal cable in the form of coil.
  • the coil of uncoated metal cable (30) is passed in vertical direction inside the operating unit where the compound (31) is applied and immediately enters the operating unit where the cross-linking polymerisation induced by ultraviolet radiation (32) occurs, then the coated cable is rewound in coils (33), according to a known mechanical process.
  • a schematic view of a preferred embodiment is seen, relating to the application of a lubricating coating.
  • the application of the layer of lubricant occurs immediately upstream of the process of drawing and/or rolling, by passing the wire 1 in the operating unit where the coating 2 is applied. Immediately thereafter, it enters the operating unit 5, where a source of UV starts the cross-linking polymerisation.
  • the wire 1 then passes through a die 4 and is drawn or rolled (5).
  • the wire is then wound in coils (6).
  • the industrial process of application and curing of the compound to form the coating is performed in line with the process of drawing of the wire. However, it is also possible to operate in such a way that the industrial process of application and curing of the compound for forming the coating is not performed in line with the drawing process of the wire.
  • the wire rod or wire 7 is passed through the unit 8 where the coating is applied and then, immediately afterwards, into the unit 9, where a source of UV starts the cross-linking polymerisation.
  • the wire 7 then passes through an extruder 10, exits in 34 to form the coils 35.
  • the industrial process of application and curing of the compound is performed several times, in order to achieve a coating formed by multiple overlapped layers.
  • the uncoated wire rod and/or wire 11 is passed in a vertical direction inside the unit 12 where the lubricating coating is applied and then enters the operating unit 13, where a UV source activates the polymerisation, then the wire is wrapped in coils 14 and is thus stored.
  • the drawing and/or rolling can be carried out in a second moment, picking up the wire rod and/or the wire from a warehouse 36 and proceeding, in the unit 37, to the drawing and/or rolling.
  • the wire is then wound in coils 38.
  • the wire rod and/or wire 39 is made to pass in a vertical direction, inside a production unit 40, where the lubricating coating is applied. Subsequently, it enters the operating unit 41, where cross-linking polymerisation occurs, induced by UV rays, then the wire is wound in coils 42 and stored.
  • the drawing and/or rolling can be performed at a later time, by taking wire rod and/or wire from the warehouse 43, proceeding to drawing or rolling at 44 and winding the wire in coils at 45.
  • the process of application and curing of the compound to form the coating may also be applied to wires and cables, already previously coated.

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EP19168246.7A 2018-04-10 2019-04-09 Method to limit corrosion and deterioration of wires and cables of ferrous metal and their alloys Active EP3553794B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ARP200100984A AR118620A1 (es) 2018-04-10 2020-04-08 Compuestos heterocíclicos

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201800004338 2018-04-10
IT102018000004462A IT201800004462A1 (it) 2018-04-13 2018-04-13 Metodo per l'applicazione e indurimento tramite radiazioni ultraviolette (uv) di un rivestimento superficiale di un materiale lubrificante e/o di supporto alla lubrificazione per la trafilatura e/o laminazione di vergella e/o filo di metallo ferroso e non ferroso e le loro leghe.

Publications (2)

Publication Number Publication Date
EP3553794A1 EP3553794A1 (en) 2019-10-16
EP3553794B1 true EP3553794B1 (en) 2023-11-22

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EP19168246.7A Active EP3553794B1 (en) 2018-04-10 2019-04-09 Method to limit corrosion and deterioration of wires and cables of ferrous metal and their alloys

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EP (1) EP3553794B1 (pl)
AR (1) AR118620A1 (pl)
ES (1) ES2971618T3 (pl)
PL (1) PL3553794T3 (pl)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115028986B (zh) * 2022-06-27 2023-06-23 重庆泰山电缆有限公司 电缆护套材料及制备方法

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* Cited by examiner, † Cited by third party
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US3813322A (en) * 1971-12-29 1974-05-28 Bell Telephone Labor Inc Radiation curable styrenated polyester coating compositions and process of curing them
JP2010257952A (ja) * 2009-03-31 2010-11-11 Jsr Corp 電線被覆用放射線硬化性樹脂組成物
CA2953510C (en) * 2014-06-23 2019-12-03 Southwire Company, Llc Uv-resistant superhydrophobic coating compositions

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EP3553794A1 (en) 2019-10-16
ES2971618T3 (es) 2024-06-06
AR118620A1 (es) 2021-10-20
PL3553794T3 (pl) 2024-04-08

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