US20120319056A1 - Electrically conductive foam - Google Patents

Electrically conductive foam Download PDF

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Publication number
US20120319056A1
US20120319056A1 US13/597,238 US201213597238A US2012319056A1 US 20120319056 A1 US20120319056 A1 US 20120319056A1 US 201213597238 A US201213597238 A US 201213597238A US 2012319056 A1 US2012319056 A1 US 2012319056A1
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US
United States
Prior art keywords
electrically conductive
weight
conductive foam
accounting
foam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/597,238
Inventor
Chao-Jui Huang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hon Hai Precision Industry Co Ltd
Original Assignee
Hon Hai Precision Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN200910302259.0 priority Critical
Priority to CN 200910302259 priority patent/CN101885923B/en
Priority to US12/541,134 priority patent/US8277885B2/en
Application filed by Hon Hai Precision Industry Co Ltd filed Critical Hon Hai Precision Industry Co Ltd
Priority to US13/597,238 priority patent/US20120319056A1/en
Publication of US20120319056A1 publication Critical patent/US20120319056A1/en
Application status is Abandoned legal-status Critical

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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00Compositions of unspecified macromolecular compounds
    • C08L101/12Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066Use of inorganic compounding ingredients
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/141Hydrocarbons
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2203/00Foams characterized by the expanding agent
    • C08J2203/14Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2207/00Foams characterised by their intended use
    • C08J2207/04Aerosol, e.g. polyurethane foam spray
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2333/00Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2333/04Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2333/06Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2333/08Homopolymers or copolymers of acrylic acid esters
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2423/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04Homopolymers or copolymers of ethene
    • C08J2423/06Polyethene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2431/00Characterised by the use of copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, or carbonic acid, or of a haloformic acid
    • C08J2431/02Characterised by the use of omopolymers or copolymers of esters of monocarboxylic acids
    • C08J2431/04Homopolymers or copolymers of vinyl acetate
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals
    • Y10T428/12014All metal or with adjacent metals having metal particles
    • Y10T428/12028Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12042Porous component

Abstract

A kind of electrically conductive foam for preventing an electronic component from electro-magnetic interference includes the following compositions: electrically conductive material accounting for about 5% to about 10% by weight; plastic material accounting for about 10% to about 16% by weight; propellant accounting for about 65% to about 75% by weight; surfactant accounting for about 0.5% to about 4% by weight; and auxiliary material accounting for about 4% to about 5% by weight.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This application is a divisional application of U.S. patent application, entitled “ELECTRICALLY CONDUCTIVE FOAM AND APPLICATION METHOD FOR SAME”, with application Ser. No. 12/541,134, filed on Aug. 13, 2009, which claims foreign priority based on Chinese Patent application No. 200910302259.0, filed in China on May 13, 2009. The contents of the above-referenced applications are hereby incorporated by reference.
  • BACKGROUND
  • 1. Technical Field
  • The present disclosure relates to foam, and particularly to electrically conductive foam and a method of applying the electrically conductive foam.
  • 2. Description of Related Art
  • Generally, an electrically conductive gasket may be shielded from electro-magnetic interference (EMI) by covering the conductive gasket with foam and a layer of electrically conductive cloth. The conductive cloth may be made of highly conductive and anti-corrosive fabric, where an electrically conductive adhesive tape is usually provided on the conductive cloth. In use, the electrically conductive gasket should be manually cut into a required shape, and affixed to a surface of an electronic component using the conductive adhesive tape.
  • However, it is time-consuming to cut the electrically conductive gasket especially when there are many electrically conductive gaskets needed to be cut. The electrically conductive gasket also may not be properly contacted with a surface of the electronic component because of carelessness of an operator, which results in the reduction or lose of EMI shielding performance of the electrically conductive gasket.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a flowchart of an exemplary embodiment of a method of applying electrically conductive foam.
  • FIG. 2 is an exploded, isometric view of an exemplary embodiment of a sprayer for spraying the electrically conductive foam.
  • DETAILED DESCRIPTION
  • An exemplary embodiment of electrically conductive foam includes electrically conductive material, plastic material, propellant, surfactant, and auxiliary material.
  • The electrically conductive material includes graphite grains or metal grains having good electrically conductive performance. In one embodiment, the electrically conductive material accounts for about 5% to about 10% of the electrically conductive foam by weight.
  • The plastic material includes polyisobutyl methacrylate or acrylic resin. In one embodiment, the plastic material accounts for about 10% to about 16% of the electrically conductive foam by weight.
  • The propellant is a liquid such as ethylene-vinyl acetate copolymer, polyethylene, or butane having high-pressure, and has high solubility and volatility performance. The propellant is capable of dissolving and frothing the electrically conductive material and plastic material to make the electrically conductive material become into foam. In one embodiment, the propellant accounts for about 65% to about 75% of the conductive foam by weight.
  • In one embodiment, the surfactant is sorbitan trioleate, and is used to control viscosity of the electrically conductive material dissolved by the propellant, and also to enhance the frothing of the propellant. In one embodiment, the surfactant accounts for about 0.5% to about 4% of the electrically conductive foam by weight.
  • The auxiliary material may include at least one of plasticizer, silicon rubber, pigment, and flame retardant. The plasticizer can be used to reduce the viscosity of the electrically conductive material frothed by the propellant. The silicon rubber makes the electrically conductive foam easily removable from an electronic component. The pigment can be used to modify color of the electrically conductive foam. The flame retardant can be used to make the electrically conductive foam flame retardant. In one embodiment, the auxiliary material accounts for about 4% to about 5% of the electrically conductive foam by weight.
  • The weight proportions of the electrically conductive material, the plastic material, and the propellant can be modified as needed to suit specific needs. For example, when the electrically conductive foam needs to have a higher electrically conductive performance, more electrically conductive material can be added to the electrically conductive foam.
  • Referring to FIG. 1 and FIG. 2, a method of applying the conductive foam is provided, which includes the following steps.
  • In step S1, the electrically conductive foam and liquid pressurized gas such as nitrogen or dimethyl are put into a sprayer 1. The liquid pressurized gas makes pressure inside the sprayer 1 to be much higher than outside the sprayer 1. The sprayer 1 includes a jar body 110, a sucker 120, a jar lid 150, a nozzle 130, and a spray pipe 140. The spray pipe 140 may be formed with different shapes to make the conductive foam eject with a required shape. Therefore, a plurality of spray pipes 140 with different shapes may be provided for a variety of needs. The jar body 110 includes an airproof cover 111. The nozzle 130 includes a pressing device 131, an opening 132, and a spout 133. A first end 121 of the sucker 120 extends into the inside of the jar body 110. A second end 122 opposite to the first end 121 of the sucker 120 passes through the airproof cover 111 of the jar body 110 and extends to the outside of the jar body 110.
  • In step S2, the sprayer 1 is shaken to mix the components of the electrically conductive foam and the liquid pressurized gas.
  • In step S3, the pressing device 131 is pressed to communicate the opening 132 with the spout 133 via well known technology. According to Bernoulli's principle, because the pressure inside the sprayer 1 is much higher than the external pressure, the conductive foam rises along the sucker 120 and is ejected, and may be directed to a surface of the electronic component, to provide electro-magnetic interference (EMI) shielding, via the spout 133 and the spray pipe 140. Once ejected, the electrically conductive foam solidifies as the liquid pressurized gas volatilizes, and the plastic material expands quickly.
  • One side of the jar lid 150 defines a handle 151. One end of the spray pipe 140 forms a pothook 141 corresponding to the handle 151. The spray pipe 140 can be hung on the side of the jar lid 150 via the pothook 141 engaging the handle 151 for storage purposes.
  • The conductive foam mentioned above does not need to be cut into a required shape, and can be properly contacted with the surface of the electronic component in a consistent manner to prevent EMI.
  • It is to be understood, however, that even though numerous characteristics and advantages of the present disclosure have been set forth in the foregoing description, together with details of the structure and function of the disclosure, the disclosure is illustrative only, and changes may be made in details, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

Claims (6)

1. An electrically conductive foam, comprising:
electrically conductive material accounting for about 5% to about 10% by weight;
plastic material accounting for about 10% to about 16% by weight;
propellant accounting for about 65% to about 75% by weight;
surfactant accounting for about 0.5% to about 4% by weight; and
auxiliary material accounting for about 4% to about 5% by weight.
2. The conductive foam of claim 1, wherein the electrically conductive material comprises graphite grains or metal grains with good electrically conductive performance
3. The conductive foam of claim 1, wherein the plastic material comprises a material selected from the group consisting of polyisobutyl methacrylate, and acrylic resin.
4. The conductive foam of claim 1, wherein the propellant comprises a material selected from the group consisting of ethylene-vinyl acetate copolymer, polyethylene, and butane.
5. The conductive foam of claim 1, wherein the surfactant comprises sorbitan trioleate.
6. The conductive foam of claim 1, wherein the auxiliary material comprises at least one of plasticizer, silicon rubber, pigment, and flame retardant.
US13/597,238 2009-05-13 2012-08-28 Electrically conductive foam Abandoned US20120319056A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN200910302259.0 2009-05-13
CN 200910302259 CN101885923B (en) 2009-05-13 2009-05-13 Conducting foam and application method thereof
US12/541,134 US8277885B2 (en) 2009-05-13 2009-08-13 Electrically conductive foam and application method for same
US13/597,238 US20120319056A1 (en) 2009-05-13 2012-08-28 Electrically conductive foam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/597,238 US20120319056A1 (en) 2009-05-13 2012-08-28 Electrically conductive foam

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US12/541,134 Division US8277885B2 (en) 2009-05-13 2009-08-13 Electrically conductive foam and application method for same

Publications (1)

Publication Number Publication Date
US20120319056A1 true US20120319056A1 (en) 2012-12-20

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US12/541,134 Expired - Fee Related US8277885B2 (en) 2009-05-13 2009-08-13 Electrically conductive foam and application method for same
US13/597,238 Abandoned US20120319056A1 (en) 2009-05-13 2012-08-28 Electrically conductive foam

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CN (1) CN101885923B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105451527B (en) * 2014-06-30 2018-07-31 浙江三元电子科技有限公司 Species conductive foam and a preparation method
CN105521928A (en) * 2016-01-22 2016-04-27 歌尔声学股份有限公司 Foam bonding method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230822A (en) * 1978-10-10 1980-10-28 W. R. Grace & Co. Flame-retardant polyurethane foams
US20030213939A1 (en) * 2002-04-01 2003-11-20 Sujatha Narayan Electrically conductive polymeric foams and elastomers and methods of manufacture thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4557379A (en) * 1983-12-16 1985-12-10 Lane Container Company Circuit board package and method of manufacture
US5151222A (en) * 1991-08-26 1992-09-29 Mcdonnell Douglas Corporation Foam absorber
US6395402B1 (en) * 1999-06-09 2002-05-28 Laird Technologies, Inc. Electrically conductive polymeric foam and method of preparation thereof
US7402277B2 (en) * 2006-02-07 2008-07-22 Exxonmobil Research And Engineering Company Method of forming metal foams by cold spray technique
US8091741B2 (en) * 2006-09-25 2012-01-10 Michael Pritchard Fluid dispenser
CN101342786A (en) * 2008-08-15 2009-01-14 陈群星 Plastic based foam metalizing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230822A (en) * 1978-10-10 1980-10-28 W. R. Grace & Co. Flame-retardant polyurethane foams
US20030213939A1 (en) * 2002-04-01 2003-11-20 Sujatha Narayan Electrically conductive polymeric foams and elastomers and methods of manufacture thereof

Also Published As

Publication number Publication date
US8277885B2 (en) 2012-10-02
US20100291288A1 (en) 2010-11-18
CN101885923B (en) 2014-04-23
CN101885923A (en) 2010-11-17

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