US 12,516,079 B2 · Silane functional stabilizers for extending long-term electrical power cable performance

Abstract

Provided are unique acyl metallocene compounds of formula (1): as defined herein. Additionally provided are dielectric enhancement fluids and hydrosilylation gel compositions, in either case comprising at least one acyl metallocene compound of formula (1). Further provided are methods for extending the useful life of an insulated cable, comprising injecting the dielectric enhancement fluids or the hydrosilylation gel compositions into the cable, wherein the acyl metallocene compound of formula (1) diffuses into the polymeric insulation. Yet further provided are methods for extending the useful life of in-service electrical cable, comprising injecting the dielectric enhancement fluid compositions into the cable, wherein the injected composition provides for both initial permeation of the acyl metallocene compound of formula (1) into the polymeric insulation, and extended retention of subsequent condensation products of the acyl metallocene compound of formula (1) in the cable insulation.

Claims24

Dependent claims

An acyl metallocene compound of formula (1):

wherein:
M is a metal ion selected from Fe(II), Mn(II), Ni(II), Co(II), Ru(II), or Os(II);
m is 1-4, where a silane acyl groups group(s) can be at any position(s) on one or both of the cyclopentadienyl rings;
p can vary from 2 to 20 carbon atoms;
R1 and R2 are C1-C4 linear or branched alkyl, or H;
X is a C1-C5 linear or branched alkyl;
Y is C1-C4 acyloxy, C1-C4 alkyloxy, or silyloxy;
and
wherein for m=1, n is two or three, and for m=2-4, n is one, two, or three.

6 more elements

A dielectric enhancement fluid, comprising:

(a) an acyl metallocene compound of formula (1):
wherein:
M is a metal ion selected from Fe(II), Mn(II), Ni(II), Co(II), Ru(II), or Os(II);
m is 1-4, where a silane acyl group(s) can be at any position(s) on one or both of the cyclopentadienyl rings;
p can vary from 2 to 20 carbon atoms;
R1 and R2 are C1-C4 linear or branched alkyl, or H;
X is a C1-C5 linear or branched alkyl;
Y is C1-C4 acyloxy, C1-C4 alkyloxy, or silyloxy;
and
wherein for m=1, n is two or three, and for m=2-4, n is one, two, or three;
and
(b) at least one component selected from:
(1) at least one a water-reactive material selected from:
(i) an organosilane monomer having at least two water-reactive groups,
(ii) the organosilane monomer (1) wherein at least one of the water-reactive groups is substituted with a condensable silanol group,
(iii) an oligomer of the above organosilane monomer (I), and/or
(iv) a co-oligomer of the above organosilane monomer (i) with a different organosilane monomer;
(2) a non-water-reactive organic material having a diffusion coefficient of less than about 10-9 cm2/sec and an equilibrium concentration of at least about 0.005 gm/cm3 in a polymeric insulation, the diffusion coefficient and the equilibrium concentration being determined at temperature T;
(3) metallocenes having a metal ion selected from Fe(II), Mn(II), Ni(II), Co(II), Ru(II), or Os(II), sandwiched between two cyclopentadienyl rings, and derivatives thereof;
(4) an organic compound having an equilibrium concentration in the polymeric insulation at 55° C., which is less than 2.25 times the equilibrium concentration at 22° C.;
(5) at least one silane functional additive derived from:
(i) a hindered phenolic antioxidant based on 2,6-di-tert-butyl phenol,
(ii) a hindered amine light stabilizer, based on tetramethyl piperidine, and/or
(iii) a UV absorber or energy quencher selected from benzotriazoles, triazines, benzophenones, and/or nickel chelates;
and/or
(6) at least one catalyst suitable to catalyze hydrolysis and condensation of the water reactive materials of (a), (1), and (5).

23 more elements

Dependencies are inferred from the claim text.

Silane functional stabilizers for extending long-term electrical power cable performance

Life of this patent

Silane functional stabilizers for extending long-term electrical power cable performance

Life of this patent

Abstract

Claims24