Composition for coating insulated wire comprising heat dissipation silicone elastomer compound having light shielding layer

Abstract

The present invention relates to a coated insulated wire having improved heat dissipation properties, insulation properties, flame retardancy, and lightweight properties; and a method of manufacturing the same.

Claims

1. A coated insulated wire sequentially comprising: a conductor coated with an adhesion enhancer; an insulating layer; a light shielding layer formed by braiding a metallic fiber yarn coated with an adhesion enhancer; and a coating layer formed of a heat dissipation silicone elastomer compound.

2. The coated insulated wire of claim 1, wherein the insulating layer further comprises the heat dissipation silicone elastomer compound.

3. The coated insulated wire of claim 1, wherein the adhesion enhancer is formed by adding triazinethiol propenyl dimethylpolysiloxane or triazinethiol butenyl dimethylpolysiloxane.

4. The coated insulated wire of claim 1, wherein the metallic fiber yarn is a fiber yarn coated with a metal and having a metal coating thickness of 0.01 μm to 10 μm.

5. The coated insulated wire of claim 4, wherein the metal comprises at least one selected from the group consisting of nickel, copper, silver, gold, iron, and tin.

6. The coated insulated wire of claim 4, wherein the fiber yarn comprises at least one selected from the group consisting of carbon fiber, fiberglass, alumina fiber, ceramic fiber, aramid fiber, and carbon nanofiber.

7. The coated insulated wire of claim 1, wherein the metallic fiber yarn comprises 50 to 3,000 filaments each having a diameter of 1 μm to 40 μm.

8. The coated insulated wire of claim 1, wherein the coated insulated wire is a wire for an electric vehicle.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a flowchart of a method of manufacturing a heat dissipation silicone elastomer compound-coated insulated wire having a light shielding layer.

(2) FIG. 2 shows microscope images according to Example 1 and Comparative Example 1.

(3) FIG. 3 shows electron microscope images of chopped strands according to Example 1 and Comparative Example 1.

BEST MODE

(4) Hereinafter, the present invention will be described in more detail with reference to the following examples. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

EXAMPLE 1

(5) 1.1 Preparation of Heat Dissipation Silicone Elastomer Compound

(6) 2,000 parts by weight of ethanol and 3-aminopropyltrimethoxysilane were added to a reactor equipped with a temperature controller and a stirrer and mixed at a rate of 300 RPM for 30 minutes, and then 500 g of aluminum hydroxide was added thereto and stirred at 20° C. for 30 minutes. Then, the resultant was filtered, washed while spraying 200 g of ethanol thereonto, and dried in a vacuum oven maintained at 60° C. for 6 hours to prepare an aluminum hydroxide anti-tracking agent treated with 3-aminopropyltrimethoxysilane.

(7) 2,000 parts by weight of ethanol and 3-aminopropyltrimethoxysilane were added to a reactor equipped with a temperature controller and a stirrer and mixed at a rate of 300 RPM for 30 minutes, and then 800 g of molybdenum oxide was added thereto and stirred at 20° C. for 30 minutes. Then, the resultant was filtered, washed while spraying 200 g of ethanol thereonto, and dried in a vacuum oven maintained at 60° C. for 6 hours to prepare a molybdenum oxide anti-tracking agent treated with 3-aminopropyltrimethoxysilane.

(8) 500 g of ethanol and 500 g of triazinethiol propenyl dimethylpolysiloxane were added to an impregnation vessel equipped with a stirrer and a temperature controller and mixed at a rate of 100 RPM to prepare an adhesion enhancer.

(9) A metal-coated fiber yarn was passed through the impregnation vessel containing the adhesion enhancer prepared in the adhesion enhancer preparation step and maintained at a temperature of 20° C. to 30° C. at a rate of 1 m/min to 100 m/min and then through a drying furnace maintained at a temperature of 60° C. to 100° C. to prepare a metal-coated fiber yarn coated with the adhesion enhancer.

(10) A copper-coated carbon fiber yarn including 800 filaments each having a diameter of 20 μm was passed through the impregnation vessel containing the adhesion enhancer maintained at 25° C. at a rate of 5 m/min and then through a drying furnace maintained at 100° C. to prepare a copper-coated carbon fiber yarn surface-treated with triazinethiol propenyl dimethylpolysiloxane.

(11) The copper-coated carbon fiber yarn surface-treated with triazinethiol propenyl dimethylpolysiloxane was cut using a chopping machine equipped with a cutter including blades spaced apart from one another at an interval of 1 mm to prepare chopped strands.

(12) 4,250 g of vinyl-terminated poly(methylvinyl)siloxane having a viscosity of 450,000 cP and 1 mmol/parts by weight of vinyl groups, 750 g of hydrogen siloxane polymer having a viscosity of 80 cP and 1.5 mmol/parts by weight of hydrogen radicals, 4,999 g of reinforcement silica, 0.25 g of a polymerization catalyst, and 0.75 g of 1-ethynyl-1-cyclohexanol (crosslinking retardant) were added to a change can mixer and mixed, followed by heat-kneading at 160° C., nitrogen purging, and cooling, thereby preparing a silicone elastomer compound.

(13) 10,000 g of the silicone elastomer compound, 2,000 g of the chopped strands of the copper-coated fiber yarn, 10,000 g of the anti-tracking agent surface-treated with the silane (mixture of aluminum hydroxide and molybdenum oxide mixed at 1:1), 10,000 g of the heat-dissipating agent, 20 g of a pigment, and 30 g of a processing aid were sequentially added to a mill mixer and mixed to prepare a heat dissipation silicone elastomer compound.

(14) 1.2 Formation of Insulating Layer

(15) A conductor formed of copper and having an outer diameter of 5 mm was passed through the impregnation vessel containing the adhesion enhancer and maintained at 25° C. at a rate of 5 m/min and then through a drying furnace maintained at 100° C. to prepare a copper conductor surface-treated with triazinethiol propenyl dimethylpolysiloxane.

(16) The copper conductor surface-treated with triazinethiol propenyl dimethylpolysiloxane was extrude-coated by being passed through a head of a rubber extruder mounted with an extrusion die at a rate of 5 m/min whiling supplying the heat dissipation silicone elastomer compound into a rubber feeder mounted on the rubber extruder, thereby forming an insulating layer.

(17) The conductor on which the insulating layer was formed was passed through a crosslinking line mounted with a heater box and maintained at 450° C. to prepare an insulated wire having a crosslinked insulating layer.

(18) 1.3 Formation of Light Shielding Layer

(19) A light shielding layer was formed on the outer circumference of the prepared insulated wire by braiding the copper-coated carbon fiber yarn surface-treated with triazinethiol propenyl dimethylpolysiloxane using a 24-weight braiding machine.

(20) 1.4 Formation of Coating Layer

(21) The insulated wire on which the heat dissipation silicone elastomer compound was formed was extrude-coated while being passed through a head of a rubber extruder mounted with an extrusion die while supplying a rubber feeder mounted on the rubber extruder, thereby forming a coating layer.

(22) The insulated wire on which the coating layer was formed was crosslinked by being passed through a crosslinking line mounted with a heater box and maintained at 450° C., thereby completing preparation of a heat dissipation silicone elastomer compound-containing coated insulated wire having a light shielding layer for electric vehicles.

COMPARATIVE EXAMPLE 1

(23) 1.1 Preparation of Heat Dissipation Silicone Elastomer Compound

(24) A heat dissipation silicone elastomer compound was prepared in the same manner as in Example 1.1 above except that chopped strands of the copper-coated fiber yarn were not used.

(25) 1.2 Formation of Insulating Layer

(26) An insulating layer was formed in the same manner as in Example 1.2 above except that triazinethiol propenyl dimethylpolysiloxane as the adhesion enhancer was not used.

(27) 1.3 Formation of Light Shielding Layer

(28) A light shielding layer was formed in the same manner as in Example 1.3 above, except that a tin-plated wire was used instead of the copper-coated carbon fiber yarn surface-treated with triazinethiol propenyl dimethylpolysiloxane.

(29) 1.4 Formation of Coating Layer

(30) A coating layer was formed in the same manner as in Example 1.4 by using the heat dissipation silicone elastomer compound prepared in Comparative Example 1.1 above.

(31) Experimental Example: Measurement of Dispersity, Tensile Strength, Thermal Conductivity, and Breakdown Voltage

(32) Tensile strength of the insulated or coated samples prepared as described above was measured by preparing dumbbell samples according to IEC 60811-1-1 standards and measuring tensile strength thereof using a universal testing machine at a rate of 200 mm/min, and thermal conductivity was measured by using samples having a thickness of 0.1 mm to 0.4 mm with a laser flash analyzer (LFA).

(33) TABLE-US-00001 TABLE 1 Tensile Thermal strength conductivity Breakdown Dispersity (MPa) (W/mK) voltage (KV) Example 1 Excellent 4.0 0.34 22 Comparative Bad 2.5 0.15 18 Example 1

(34) As shown in Table 1 above, it may be confirmed that the sample according to Example 1 had improved voltage resistance, tensile strength, and thermal conductivity compared with that of Comparative Example 1. That is, it may be found that effects may vary according to application of chopped strands of a metallic fiber yarn of the coating layer, application of the adhesion enhancer of the insulating layer, and application of a metallic fiber yarn coated with the adhesion enhancer to the light shielding layer.

(35) In addition, as shown in FIG. 2, it was confirmed that the dispersity may also be improved without entanglement of chopped strands according to Example 1 when compared with Comparative Example 1. As shown in FIG. 3, it was confirmed that the silane was uniformly coated on the surface of the metal-coated fiber yarn according to Example 1, unlike in Comparative Example 1.