Method for manufacturing plastic substrate for electrostatic painting

Patent metadata

Field	Value
Publication number	US-10486334-B2
Application number	US-201615293426-A
Country	US
Kind code	B2
Filing date	Oct 14, 2016
Priority date	Oct 14, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A method of preparing a plastic substrate for electrostatic painting includes preparing a carbon nanotube pellet by molding carbon nanotube powder. The method also includes preparing a conductive resin composition by mixing 0.1 to 10 wt % of the carbon nanotube pellet, 0.1 to 20 wt % of carbon black, and 70 to 99 wt % of a thermoplastic polymer resin. The method further includes molding the conductive resin composition.

First claim

What is claimed is:

1. A method of preparing a plastic substrate for electrostatic painting, comprising:
(a) preparing a carbon nanotube pellet by molding carbon nanotube powder;
(b) preparing a conductive resin composition by mixing 0.1 to 10 wt % of the carbon nanotube pellet, 0.1 to 20 wt % of carbon black, and 70 to 99 wt % of a rubber-reinforced styrene-based resin; and
(c) molding the conductive resin composition by extrusion at a temperature in a range of 200° C. to 300° C.,
wherein the mixing of step (b) comprises mixing the carbon nanotube pellet and the carbon black at a weight ratio of 1.5:5 to 1.5:10.

2. The method of claim 1 , wherein, in step (a), the molding is performed by injecting the carbon nanotube powder into a rotary tablet press and applying pressure.

3. The method of claim 2 , wherein the pressure is in a range of 100 to 700 kg/cm 3 .

4. The method of claim 2 , wherein the rotary tablet press has a punch size in a range of 1 to 8 mm.

5. The method of claim 4 , wherein a turntable of the rotary tablet press has a rotational speed in a range of 10 to 60 rpm.

6. The method of claim 1 , wherein a carbon nanotube included in the carbon nanotube pellet has a diameter of 50 nm or less and a length of 100 μm or less.

7. The method of claim 6 , wherein the carbon nanotube has a bulk density in a range of 50 to 800 kg/m 3 .

8. The method of claim 1 , wherein the carbon black has a specific surface area in a range of 30 to 300 m 2 /g and a dibutyl phthalate (DBP) oil absorption amount of 600 cc/100 mg or less.

9. The method of claim 8 , wherein the carbon black has an average particle size of 100 nm or less.

10. The method of claim 1 , wherein the rubber-reinforced styrene-based resin comprises at least one of an acrylonitrile-butadiene-styrene copolymer (ABS) resin, an acrylonitrile-acrylic rubber-styrene copolymer (AAS) resin, and an acrylonitrile-ethylene propylene rubber-styrene copolymer (AES) resin.

11. The method of claim 1 , wherein, in step (c), the molding is performed by extrusion molding, injection molding, or a combination thereof.

Assignees

• Korea Kumho Petrochemical Co Ltd

Inventors

• Hwang Ho Soo
• Lee Wan Sung
• Kim Dong Hwan

Classifications

• B29C48/022

  characterised by the choice of material · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• B29L2031/30

  Vehicles, e.g. ships or aircraft, or body parts thereof {(vanes or blades B29L2031/08, air bags B29L2022/027)} · CPC title

• B29K2995/0005

  Conductive · CPC title

• C08J7/04

  Coating · CPC title