Composite material having improved electrical conductivity and molded part containing same

A technology of composite materials and molded products, applied in the field of composite materials, can solve the problems of poor processing performance of resin, easy decomposition of carbon black, thermal stability and damage of other physical properties.

Inactive Publication Date: 2015-09-16
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of carbon black needs to be added to achieve high conductivity and the structure of carbon black is easily decomposed during the melt mixing process.
The resulting resin would have poor processability, and thermal stability and other physical properties would suffer greatly

Method used

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  • Composite material having improved electrical conductivity and molded part containing same
  • Composite material having improved electrical conductivity and molded part containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4 and comparative example 1-3

[0078] 3 wt% of carbon nanotubes, 1 wt% of carbonaceous conductive agent, and 96 wt% of polyamide resin (LUMID GP-1000B) were mixed together. The mixture was extruded at 280° C. from a twin-screw extruder (L / D=42, φ=40 mm) to prepare pellets with a size of 0.2 mm×0.3 mm×0.4 mm.

[0079] The pellets were molded in an injection molding machine at a temperature of 280° C. under flat airfoil conditions to prepare long bone-shaped samples with a thickness of 3.2 mm and a length of 12.7 mm. The samples were maintained at 23°C and 50% RH for 48 hours.

[0080] [Table 1]

[0081]

[0082]The average length of bundled carbon nanotubes used as raw material before processing was measured by dispersing powdered carbon nanotubes in solution by ultrasonication for 30 seconds to 2 minutes, and imaging the dispersion on the wafer by SEM , and the SEM images were analyzed using Scandium 5.1 (Olympus soft Imaging Solutions GmbH, Germany).

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Abstract

Provided is composite material obtained by treating resin composition comprising: a thermoplastic resin; bundle-type carbon nanotubes; and an electrically conductive carbon additive, wherein the pre-treatment carbon nanotubes have ID / IG value of 1.0 or less, and the length retention rate of the carbon nanotubes remaining in the composite material post-treatment is 40-99%. The composite material containing the thermoplastic resin can be produced into a variety of molded parts as the electrical conductivity of the composite material is enhanced without degrading the mechanical properties thereof.

Description

technical field [0001] The invention relates to a composite material with increased electrical conductivity and moldings comprising the composite material. Background technique [0002] Thermoplastic resins, especially high-performance plastics with excellent mechanical properties and good heat resistance, are used in a variety of applications. For example, polyamide resins and polyester resins are suitable for the preparation of various industrial parts, including electrical / electronic parts, machine parts and automotive parts, mainly by injection molding due to their good balance of mechanical properties and toughness. Polyester resins with excellent moldability, heat resistance, mechanical properties and chemical resistance, especially polybutylene terephthalate and polyethylene terephthalate, are widely used as industrial moldings Examples include connectors, relays, and automotive switches and materials for electrical / electronic devices. Amorphous resins such as polyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/24H01B1/04H05K9/00
CPCH01B1/24H05K9/00H01B1/04H05K9/0079H05K9/0083C08K3/041C08K3/04C08L77/06C09C1/48H01G11/36Y02E60/13B29B9/06B29K2101/12B29K2105/0005B29K2105/0026B29K2105/0032B29K2105/0038B29K2105/0044B29K2105/162B29K2507/04B29K2995/0005H05K9/0081
Inventor 崔然植李秀敏崔琦大尹敞勋
Owner LG CHEM LTD
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