Electromagnetic shielding composite resin composition and high-voltage shielded wire comprising same

1 . A high-voltage shielded wire comprising:

a core composed of a conductive material;

an insulation layer enveloping the core;

an electromagnetic shielding layer surrounding the insulation layer and employing an electromagnetic shielding composite resin composition; and

a coating layer covering the electromagnetic shielding layer and composed of an insulation material,

wherein the electromagnetic shielding composite resin composition contains a thermoplastic resin, a metal-coated carbon fiber, carbon black, a carbon nanotube, and an additive, and

wherein the thermoplastic resin comprises a polyurethane,

wherein the additive contains an antioxidant, and

wherein the antioxidant contains any one or more of a phenol-based compound or a thioether-based compound,

wherein the carbon fiber has a diameter of 4 μm to 10 μm,

wherein the carbon nanotube has an aspect ratio of 100 to 1,000, and wherein the metal-coated carbon fiber is coated with a multi-layer metal comprising nickel and copper.

2 . The high-voltage shielded wire as claimed in claim 1 , wherein the electromagnetic shielding composite resin composition contains 5 to 50 parts by weight of metal-coated carbon fibers, 0.1 to 5 parts by weight of carbon black, and 0.1 to 5 parts by weight of carbon nanotubes, based on 100 parts by weight of the thermoplastic resin.

3 . The high-voltage shielded wire as claimed in claim 1 , wherein the metal coated on the metal-coated carbon fiber contains any one or two or more selected from the group consisting of palladium, nickel, copper, silver, aluminum, and magnesium.

4 . The high-voltage shielded wire as claimed in claim 1 , wherein the electromagnetic shielding composite resin composition further contains 0.1 to 5 parts by weight of the antioxidant.

5 . The high-voltage shielded wire as claimed in claim 4 , wherein the additive also contains any one or more of a lubricant, a compatibilizer, a colorant, a release agent, a flame retardant, or a plasticizer.

6 . The high-voltage shielded wire as claimed in claim 1 , wherein the electromagnetic shielding composite resin composition has an electromagnetic shielding efficiency of 30 dB or more, as measured by ASTM ES7 in a frequency band of 1 GHz.

7 . The high-voltage shielded wire as claimed in claim 1 , further comprising a metal tape between the electromagnetic shielding layer and the coating layer.

8 . The high-voltage shielded wire as claimed in claim 1 , wherein the high-voltage shielded wire has an electromagnetic shielding efficiency of 25 dB or more, as measured according to IEC 62153-4-6 based on a 3 MHz wire.

9 . A method for preparing the electromagnetic shielding composite resin composition of claim 1 , the method comprising:

a) preparing a matrix resin by kneading the thermoplastic polyurethane elastomer, the phenol-based compound antioxidant, and carbon black;

b) preparing a resin composite by adding and kneading metal-coated carbon fibers having a diameter of 4 μm to 10 μm to the matrix resin, wherein the metal-coated carbon fibers are coated with a multi-layer metal comprising nickel and copper; and

c) preparing the electromagnetic shielding composite resin composition by kneading the carbon nanotubes having an aspect ratio of 100 to 1,000 to the resin composite.