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WO1995004359A1 - Revetements protecteurs pour des revetements isolants sur des fils electriques - Google Patents

Revetements protecteurs pour des revetements isolants sur des fils electriques Download PDF

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Publication number
WO1995004359A1
WO1995004359A1 PCT/GB1994/001474 GB9401474W WO9504359A1 WO 1995004359 A1 WO1995004359 A1 WO 1995004359A1 GB 9401474 W GB9401474 W GB 9401474W WO 9504359 A1 WO9504359 A1 WO 9504359A1
Authority
WO
WIPO (PCT)
Prior art keywords
melamine cyanurate
coatings
coating
insulating coating
flame retardant
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.)
Ceased
Application number
PCT/GB1994/001474
Other languages
English (en)
Inventor
Richard Stuart Williams
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.)
Federal Mogul Technology Ltd
Original Assignee
T&N Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by T&N Technology Ltd filed Critical T&N Technology Ltd
Publication of WO1995004359A1 publication Critical patent/WO1995004359A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
    • C08K5/3477—Six-membered rings
    • C08K5/3492—Triazines
    • C08K5/34928—Salts

Definitions

  • This invention is concerned with providing an insulating coating on an electrical wire with a flame retardant protective coating, and with wires having such protective coatings.
  • the coatings on electrical wires should be flame retardant, ie they must pass tests relating to the time that they burn after a flame has been removed therefrom before extinguishing themselves.
  • the combination of a PVC insulating coating and a Nylon 6 protective coating is sufficiently flame retardant to pass such tests since PVC, in the case of fire, releases chlorine radicals which act as a retardant sufficient to act on both the PVC and the Nylon 6.
  • PVC in the case of fire, releases chlorine radicals which act as a retardant sufficient to act on both the PVC and the Nylon 6.
  • PVC in the case of fire
  • insulating coatings made of polyolefins and polydefinic co-polymers are coming into use.
  • the chlorine radicals released by PVC are not available to act as a flame retardant for Nylon 6 so that the combination of such an insulating coating and the Nylon 6 protective coating does not pass the flammability tests.
  • the insulating coating when made of polyolefin or olefin co-polymer may be made flame retardant by dispersing a flame retardant material such as magnesium hydroxide therein but this flame retardancy does not extend to the Nylon 6.
  • Providing the Nylon 6 with a flame retardant has proved difficult since dispersing a flame retardant in such a thin coating results in surface imperfections which can lead to cra ⁇ ks, prevents the coating from having sufficient elongation to remain intact during coiling and is difficult to extrude successfully.
  • the invention provides a method of providing an insulating coating on an electrical wire with a flame retardant protective coating, characterised in that the method comprises dispersing melamine cyanurate into a polyamide to form an intermediate composition containing a pre-determined proportion of melamine cyanurate, dispersing said composition into a further quantity of the polyamide to form a moulding composition containing 5-30% by weight of the melamine cyanurate, and extruding said moulding composition onto said insulating coating.
  • the method according to the invention results in a smooth elongatable coating which provides sufficient fire retardancy to enable the flammability tests to be passed.
  • the moulding composition can be extruded without undue problems such as foaming occurring.
  • Melamine cyanurate is a well known flame retardant used in quantities of about 5-10% by weight in Nylon 6 which is used for injection moulding electrical components. However, if the standard formulations used for injection moulding are used for the purpose of a protective coating as referred to above, it is found that unsatisfactory coatings are obtained. When the percentage of melamine cyanurate is increased, the material is found to foam in the extruder and give increasingly rough coatings. However, with the use of the method according to the invention, the foaming problem is not experienced during compounding and smooth satisfactory coatings are obtained.
  • the intermediate composition has 10-60% by weight of melamine cyanurate dispersed therein.
  • said moulding composition contains 10-20% by weight of melamine cyanurate.
  • the polyamide is a Nylon 6, for example a high viscosity Nylon 6.
  • the moulding composition may be extruded as a coating 50 to 200 microns in thickness, eg approximately 125 microns in thickness.
  • the invention also provides an electrical wire having an insulating coating thereon with a flame retardant protective coating applied thereto by a method according to the invention.
  • a screw type plastics extruding machine was used to disperse 50% by weight of melamine cyanurate into a Nylon 6.
  • the intermediate composition extruded by the machine thus contained a predetermined proportion of melamine cyanurate.
  • the extrusion from the machine was allowed to solidify and was granulated. It was then dispersed into a further quantity of the high viscosity Nylon 6 in a further extruding machine which extruded the composition through a die on to the insulating coating of an electrical wire.
  • the coating was approximately 125 microns in thickness.
  • the moulding composition extruded had a melamine cyanurate content of approximately 15% by weight, ie the intermediate composition was dispersed into an equal quantity of Nylon 6.
  • the extruded protective coating was found to have a very smooth surface which was substantially free of imperfections and gave good elongation.
  • the wire also passed the standard flammability test.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un fil électrique ayant un revêtement isolant recouvert d'un revêtement protecteur. On disperse du cyanurate de mélamine dans un polyamide pour former une composition intermédiaire qui est dispersée dans une quantité additionnelle du polyamide et extrudée sur le revêtement isolant.
PCT/GB1994/001474 1993-08-03 1994-07-07 Revetements protecteurs pour des revetements isolants sur des fils electriques Ceased WO1995004359A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9316009A GB2280634A (en) 1993-08-03 1993-08-03 Flame retardant coatings for insulated electrical wires
GB9316009.1 1993-08-03

Publications (1)

Publication Number Publication Date
WO1995004359A1 true WO1995004359A1 (fr) 1995-02-09

Family

ID=10739844

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001474 Ceased WO1995004359A1 (fr) 1993-08-03 1994-07-07 Revetements protecteurs pour des revetements isolants sur des fils electriques

Country Status (2)

Country Link
GB (1) GB2280634A (fr)
WO (1) WO1995004359A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996028499A1 (fr) * 1995-03-13 1996-09-19 E.I. Du Pont De Nemours And Company Composition de resine polyamide ignifuge et procede de fabrication de celle-ci
EP1676877A1 (fr) * 2004-12-28 2006-07-05 Campine N.V. Composition de polyamide et/ou polyester inimflammable et procedure de cette preparation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2605251A1 (fr) * 2011-12-15 2013-06-19 Nexans Câble sans halogène résistant à la température

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54148050A (en) * 1978-05-13 1979-11-19 Asahi Chem Ind Co Ltd Flame-retardant polyamide composition
JPS56106955A (en) * 1980-01-31 1981-08-25 Asahi Chem Ind Co Ltd Flame-retardant polyamide composition
JPS58134162A (ja) * 1982-02-04 1983-08-10 Furukawa Electric Co Ltd:The 絶縁電線

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6033850B2 (ja) * 1977-01-17 1985-08-05 日産化学工業株式会社 難燃性樹脂組成物
GB2103822B (en) * 1981-07-23 1985-08-21 Standard Telephones Cables Ltd Flame retardant plastics sheathed optical and/or electrical cables
GB2170646B (en) * 1982-10-01 1987-02-11 Raychem Ltd Flame retardant cable
IT1160761B (it) * 1983-03-25 1987-03-11 Pirelli Cavi Spa Cavo per basse tensioni

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54148050A (en) * 1978-05-13 1979-11-19 Asahi Chem Ind Co Ltd Flame-retardant polyamide composition
JPS56106955A (en) * 1980-01-31 1981-08-25 Asahi Chem Ind Co Ltd Flame-retardant polyamide composition
JPS58134162A (ja) * 1982-02-04 1983-08-10 Furukawa Electric Co Ltd:The 絶縁電線

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Derwent World Patents Index; Class A23, AN 81-74570D *
PATENT ABSTRACTS OF JAPAN vol. 4, no. 12 (C - 71) 29 January 1980 (1980-01-29) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 248 (C - 193) 4 November 1983 (1983-11-04) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996028499A1 (fr) * 1995-03-13 1996-09-19 E.I. Du Pont De Nemours And Company Composition de resine polyamide ignifuge et procede de fabrication de celle-ci
EP1676877A1 (fr) * 2004-12-28 2006-07-05 Campine N.V. Composition de polyamide et/ou polyester inimflammable et procedure de cette preparation

Also Published As

Publication number Publication date
GB9316009D0 (en) 1993-09-15
GB2280634A (en) 1995-02-08

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