Plastic composite resin composition, a method of manufacturing a plastic molded article, and a plastic molded article for radar absorption manufactured using the method

Patent metadata

Field	Value
Publication number	US-12234359-B2
Application number	US-202117522753-A
Country	US
Kind code	B2
Filing date	Nov 9, 2021
Priority date	May 14, 2021
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

The present disclosure relates to a plastic composite resin composition, a method of manufacturing a plastic molded article using the same, and a plastic molded article for radar absorption manufactured using the method. More particularly, the present disclosure provides a method of improving a radar absorption rate by manufacturing a plastic molded article having pores formed therein using a plastic resin including polyamide, a filler including carbon nanotubes, and a foaming agent.

First claim

What is claimed is:

1. A method of manufacturing a plastic molded article for radar absorption, the method comprising:
preparing a plastic composite resin composition comprising a plastic resin and a filler, wherein the plastic resin comprises polyamide;
adding a foaming agent to the plastic composite resin, followed by mixing and injection molding, thus forming a molded article; and
manufacturing a foaming molded article by performing foaming using the foaming agent to form pores in the molded article,
wherein the pores have a long axis length of 0.3 to 1.0 mm.

2. The method of claim 1 , wherein the foaming agent comprises a foaming material containing sodium hydrogen carbonate and is added in an amount of 2 to 4 parts by weight based on 100 parts by weight of the plastic composite resin.

3. The method of claim 1 , wherein the foaming molded article has a pore volume fraction of 10 to 50% with respect to the total volume thereof.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Cho Byung Kyu

Classifications

• C08J2203/02

  CO2-releasing, e.g. NaHCO3 and citric acid · CPC title

• C08J2377/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08J2377/10 takes precedence) · CPC title

• C08J2423/04

  Homopolymers or copolymers of ethene · CPC title

• C08J9/08

  developing carbon dioxide · CPC title

• C08J2377/00

  Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers · CPC title