High heat radiation composite and a method of fabricating the same

Patent metadata

Field	Value
Publication number	US-9296871-B2
Application number	US-201414449585-A
Country	US
Kind code	B2
Filing date	Aug 1, 2014
Priority date	Mar 8, 2012
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

The present disclosure provides a high heat radiation composite material including a hybrid filler comprising expanded graphite filled with expandable polymeric beads, and a fabrication method thereof. In the method, a dispersion solution is prepared by dispersing expandable polymeric beads in ethanol. Expanded graphite is immersed in the dispersion solution, and heat-treated to remove ethanol, thereby producing the hybrid filler. The hybrid filler is dispersed into the matrix polymer via an extrusion/injection process, thereby producing the composite material.

First claim

What is claimed is:

1. A high heat radiation composite, comprising:
a hybrid filler; and
a matrix polymer,
wherein the hybrid filler is formed by placing expandable polymeric beads into microvoids or micro spaces of porous expanded graphite and heat-treating the resulting mixture, and the hybrid filler is dispersed into the matrix polymer, thereby forming the composite.

2. The composite of claim 1 , wherein the expanded graphite is graphite expanded by acid treatment and heat treatment.

3. The composite of claim 1 , wherein the expanded graphite has an expansion coefficient that ranges from about 200 to about 400.

4. The composite of claim 1 , wherein the expanded graphite has an average particle size that ranges from about 600 μm to about 1,500 μm.

5. The composite of claim 1 , wherein the expandable polymeric beads have an average particle size that ranges from about 1 μm to about 10 μm.

6. The composite of claim 1 , wherein the mixture ratio of the expanded graphite to the expandable polymeric beads ranges from about 5-20: about 10-40.

7. The composite of claim 1 , wherein the matrix polymer is selected from the group consisting of polyethylene, polypropylene, polystyrene, polyalkylene terephthalate, polyamide resin, polyacetal resin, polycarbonate, polysulfone, and polyimide.

8. The composite of claim 1 , wherein the expanded graphite has an average particle size that ranges from about 900 μm to about 2,000 μm.

9. The composite of claim 1 , wherein the expanded polymeric beads have an average particle size that ranges from about 3 μm to about 5 μm.

10. The composite of claim 1 , wherein the composite has a thermal conductivity of about 10 W/mk to about 20 W/mk.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Song Kyong Hwa
• Lee Han Saem
• Kwak Jin Woo
• Choi Byung Sam

Classifications

• H01M10/6555

  arranged between the cells · CPC title

• C08L101/12

  characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity (liquid crystal materials or compositions C09K19/00) · CPC title

• C08L25/06

  Polystyrene · CPC title

• C08L23/02

  not modified by chemical after-treatment · CPC title

• C08L77/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence) · CPC title