Method for manufacturing plastic dielectric having holes and plastic dielectric manufactured thereby

Patent metadata

Field	Value
Publication number	US-9431173-B2
Application number	US-201414336110-A
Country	US
Kind code	B2
Filing date	Jul 21, 2014
Priority date	Jul 22, 2013
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A method for manufacturing a plastic dielectric having a plurality of holes and a plastic dielectric manufactured thereby. The method for manufacturing a plastic dielectric includes the steps of: (a) injecting a plastic material into an airtight container; (b) injecting inert gas into the airtight container at pressure of 5 to 9 MPa; (c) maintaining the temperature inside the airtight container at 20 to 50° C.; (d) leaving the airtight container for a predetermined period till an amount of inert gas dissolved in the plastic material becomes 6% wt or more and drawing the plastic material out of the airtight container; and (e) heating the plastic material at temperature of 40 to 110° C.

First claim

What is claimed is:

1. A method for manufacturing a plastic dielectric which has a sponge structure comprised of a plurality of pores, the method comprising:
inserting a plastic material into an airtight container;
injecting inert gas into the airtight container at pressure of 5 to 9 MPa;
maintaining the temperature inside the airtight container at 20 to 50° C.;
leaving the airtight container for a predetermined period until an amount of inert gas dissolved in the plastic material becomes 6% wt or more and drawing the plastic material out of the airtight container; and
heating the plastic material at temperature of 40 to 110° C.,
wherein the sponge structure has 1,000,000,000,000 pores per 1 cm 3 .

2. The plastic dielectric manufacturing method according to claim 1 , wherein in the heating the drawn-out plastic material, the drawn-out plastic material is soaked in glycerin or water heated at 40 to 110° C.

3. The plastic dielectric manufacturing method according to claim 1 , wherein the heating the drawn-out plastic material is either the step of using conduction by a plate heater or the step of using radiation by an IR heater.

4. The plastic dielectric manufacturing method according to claim 1 , wherein the inert gas is CO 2 , N 2 , He or Ar.

5. The plastic dielectric manufacturing method according to claim wherein each of the pores has the radius of 1.0 μm or less.

6. The plastic dielectric manufacturing method according to claim 1 , wherein the plastic material is one or a mixture of two or more materials selected from a group composed of polyethylene terephthalate (PET), polypropylene (PP), acrylonitrile butadiene styrene copolymer (ABS), polyester, poly carbonate (PC), polyphenylene sulfide (PPS) and polytetrafluoroethylene (PTFE).

7. A method for manufacturing a plastic dielectric which has a sponge structure comprised of a plurality of pores, the method comprising:
inserting a plastic material into an airtight container;
injecting inert gas into the airtight container at pressure of 5 to 9 MPa;
maintaining the temperature inside the airtight container at 20 to 50° C.°;
leaving the airtight container for a predetermined period until an amount of inert gas dissolved in the elastic material becomes 6% wt or more and drawing the plastic material out of the airtight container; and
heating the plastic material at temperature of 40 to 110° C.
wherein in the leaving, the predetermined period is 30 minutes to 180 minutes.

Assignees

• Industry-Academic Cooperation Foundation Yonsei Univ

Inventors

• Cha Sung Woon
• Kim Young Ho

Classifications

• B29C44/3453

  Feeding the blowing agent to solid plastic material · CPC title

• B29K2025/08

  Copolymers of styrene, e.g. AS or SAN, i.e. acrylonitrile styrene (B29K2055/02 takes precedence) · CPC title

• B29K2055/02

  ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers · CPC title

• B29K2081/04

  Polysulfides, e.g. PPS, i.e. polyphenylene sulfide or derivatives thereof · CPC title

• B29K2027/18

  PTFE, i.e. polytetrafluoroethylene {, e.g. ePTFE, i.e. expanded polytetrafluoroethylene} · CPC title