Electrical cable including a crosslinked layer

Patent metadata

Field	Value
Publication number	US-10741302-B2
Application number	US-201515312953-A
Country	US
Kind code	B2
Filing date	Apr 10, 2015
Priority date	May 20, 2014
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

An electrical cable ( 1 ) includes an elongate electrical conductor ( 2 ) surrounded by at least one crosslinked layer ( 3, 4, 5 ) obtained from a polymer composition including a polymer material and a protection system. The protection system includes diphenylamine or a diphenylamine derivative and a sulfur compound selected among an organic thiol, a thiolate, and one of the mixtures thereof.

First claim

The invention claimed is:

1. An electric cable comprising:
an elongated electrical conductor surrounded by at least one crosslinked layer obtained from a polymer composition comprising a polymer material and a protective system, wherein said cable comprises a first semiconducting layer surrounding the elongated electrical conductor, an electrically insulating layer surrounding the first semiconducting layer and a second semiconducting layer surrounding the electrically insulating layer, the crosslinked layer being at least one of these three layers,
wherein said protective system has:
from 0.1 to 5.0 parts of diphenylamine or a diphenylamine derivative, per 100 parts by weight of polymer material, and
from 0.1 to 5.0 parts by weight of a sulfur-comprising compound chosen from an organic thiol, a thiolate, and one of their mixtures, per 100 parts by weight of polymer material,

wherein said sulfur-comprising compound is:
(i) a sulfur-comprising compound of organic thiol type selected from 2-mercaptopyridine (MPY), 2-mercaptopyrimidine (MPM), 2-mercaptobenzimidazole (MBI), 2-mercaptobenzothiazaole (MBT), and their derivatives; 2,5-dimercapto-1,3,4-thiadiazole (DMT), 2-mercaptoethyl ether (DME), 2-mercaptoethyl sulfide (DMES) and their derivatives; trithiocyanuric acid (TT), 6-dibutylamino-1,3,5-triazinedithiol (DB), 6-anilino-1,3,5-triazinethiol (AF) and their derivatives; or
(ii) a salt of one of said sulfur-comprising compound of organic thiol type; or
(iii) a sulfur-comprising compound of the organic thiol and thiolate type selected from trithiocyanuric acid monosodium salt (TTN), 6-dibutylamino-1,3,5-triazinedithiol monosodium salt (DBN) and 6-anilino-1,3,5-triazinethiol monosodium salt (AFN); and

wherein the polymer material includes
a mixture of a copolymer of ethylene and of α-olefin and an ethylene-propylene elastomer copolymer (EPM); or
a mixture of a copolymer of ethylene and of α-olefin and an ethylene-propylene-diene monomer terpolymer (EPDM), and

wherein the copolymer of ethylene and of α-olefin is a copolymer of ethylene and octene (PEO) or a copolymer of ethylene and of butene (PEB).

2. The cable as claimed in claim 1 , wherein the diphenylamine derivative is chosen from octylated diphenylamine (ODPA), styrenated diphenylamine (SDPA) and one of their mixtures.

3. The cable as claimed in claim 1 , wherein the sulfur-comprising compound is an organic monothiol.

4. The cable as claimed in claim 1 , the sulfur-comprising compound is a benzimidazole derivative.

5. The cable as claimed in claim 1 , wherein the sulfur-comprising compound is chosen from mercaptobenzimidazoles and their derivatives.

6. The cable as claimed in claim 5 , wherein the mercaptobenzimidazoles or their derivatives are chosen from 2-mercaptobenzimidazole (MBI), the methylated derivatives of 2-mercaptobenzimidazole (MMBI) and one of their mixtures.

7. The cable as claimed in claim 1 , wherein the polymer material comprises more than 30% by weight of olefin polymer(s), with respect to the total weight of polymer material in the polymer composition.

8. The cable as claimed in claim 1 , wherein the polymer material comprises a copolymer of ethylene and of octene (PEO) and an ethylene-propylene-diene monomer terpolymer (EPDM).

9. The cable as claimed in claim 8 , wherein the polymer material comprises from 60 to 90% by weight of PEO and from 10 to 40% by weight of EPDM, with respect to the total weight of the polymer material in the polymer composition.

10. The cable as claimed in claim 1 , wherein the polymer composition comprises from 1.0 to 10.0 parts by weight of metal oxide per 100 parts by weight of polymer material.

11. The cable as claimed in claim 1 , wherein the polymer composition additionally comprises a crosslinking agent.

12. The cable as claimed in claim 11 , wherein the crosslinking agent is an organic peroxide.

13. The cable as claimed in claim 1 , wherein the polymer composition comprises less than 3% by weight of lead oxide, with respect to the total weight of the polymer composition.

14. The cable as claimed in claim 1 , wherein the polymer composition comprises more than 30% by weight of polymer material, with respect to the total weight of the polymer composition.

15. The cable as claimed in claim 1 , wherein the polymer composition does not comprise halogenated polymer.

16. The cable as claimed in claim 1 , wherein the polymer composition does not comprise polyorganosiloxane.

17. The cable as claimed in claim 1 , wherein the crosslinked layer is an extruded layer.

18. The cable as claimed in claim 1 , wherein the crosslinked layer is a layer directly in physical contact with the elongated electrical conductor.

19. The cable as claimed in claim 1 , wherein the crosslinked layer is said electrically insulating layer.

20. A process for the manufacture of a cable as claimed in claim 1 , wherein said process comprises the following stages:
i. extruding the polymer composition around an elongated electrical conductor, in order to obtain an extruded layer, and
ii. crosslinking the extruded layer of stage i.

21. The cable as claimed in claim 1 , wherein said polymer composition further comprises an inert filler i-s selected among chalk, talc and clay.

22. The cable as claimed in claim 1 , wherein said polymer composition further comprises a metal oxide.

23. The cable as claimed in claim 22 , wherein the metal oxide is zinc oxide (ZnO).

24. An electric cable according to claim 1 , wherein the combined amounts and types of (1) diphenylamine or a diphenylamine derivative,
(2) sulfur-comprising compound chosen from an organic thiol, a thiolate, and one of their mixtures, and
(3) polymer material results in a crosslinked layer that has a water absorption of at most 0.9 mg/cm 2 during immersion in water at 70° C. for 14 days.

25. An electric cable according to claim 1 , wherein the crosslinked layer further comprises from 30 to 100 parts by weight of inert filler(s) per 100 parts by weight of polymer material.

26. An electric cable according to claim 1 , wherein said polymer composition further comprises an antioxidant different from the protective system compounds.

Assignees

• Nexans

Inventors

• Roos Andreas
• Dalbe Bernard
• Larche Jean-François

Classifications

• H01B7/282

  Preventing penetration of fluid {, e.g. water or humidity,} into conductor or cable · CPC title

• H01B3/441 Primary

  from alkenes · CPC title

• C08K5/18 Primary

  with aromatically bound amino groups · CPC title

• C08K5/378

  containing heterocyclic rings · CPC title

• Y02A30/14

  Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables · CPC title