WO2004036973A1 - 導電性クッション材料及びその製造方法 - Google Patents
導電性クッション材料及びその製造方法 Download PDFInfo
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- WO2004036973A1 WO2004036973A1 PCT/JP2003/013175 JP0313175W WO2004036973A1 WO 2004036973 A1 WO2004036973 A1 WO 2004036973A1 JP 0313175 W JP0313175 W JP 0313175W WO 2004036973 A1 WO2004036973 A1 WO 2004036973A1
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- WIPO (PCT)
- Prior art keywords
- conductive
- cushion material
- elastic resin
- carbon black
- conductive cushion
- Prior art date
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2418—Coating or impregnation increases electrical conductivity or anti-static quality
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2926—Coated or impregnated inorganic fiber fabric
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/654—Including a free metal or alloy constituent
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/654—Including a free metal or alloy constituent
- Y10T442/655—Metal or metal-coated strand or fiber material
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/699—Including particulate material other than strand or fiber material
Definitions
- the present invention relates to a conductive cushion material having a high electromagnetic wave shielding effect and a high flexibility, and a method for producing the same. More specifically, the present invention relates to a fiber aggregate made of a conductive fine wire, and a conductive filler having a cavity and a conductive filler. The present invention relates to a conductive cushion material containing a dispersed elastic resin and a method for producing the same. Background art
- An electromagnetic wave shielding material is a material that does not allow external electromagnetic waves to enter inside or blocks electromagnetic waves from inside, such as by covering electronic equipment or buildings with a shielding material.
- the conductive material in (1) above when using, for example, carbon black as the conductive material, a high-concentration filling is required, and the conductive material is high enough to show good conductivity. At the filling ratio of the concentration, the mechanical properties become inferior. On the other hand, to reduce the filling rate, expensive raw materials such as silver are required. Further, the production method by the impregnation method has a drawback that the steps are complicated.
- mesh, metal foil, expanded metal, etc. May be anisotropic, that is, it may not be isotropic.
- the conductivity fluctuates. Furthermore, high conductivity requires high-density filling (burial), resulting in the disadvantage of losing cushioning properties.
- the metallization layer on the contact surface of the housing or the like easily falls off due to rubbing when exerting a shock-absorbing or other buffering action.
- the conductive layer does not have an elastic property when bonding a thin metal wire mesh or the like.
- the cushioning property of the whole system deteriorates.
- adhesion of a contact portion such as a housing is deteriorated, and electromagnetic waves may easily leak.
- the proposed conventional conductive material for electromagnetic wave shielding has various problems. Therefore, an electromagnetic wave shielding excellent in solving those problems and a conductive cushion material are strongly desired. It is rare.
- An object of the present invention is to solve the above-mentioned problems of the conventional conductive materials and the like, effectively block electromagnetic waves leaking from a housing of an information device such as a mobile phone, and provide an electronic component which is relatively vulnerable to impact.
- An object of the present invention is to provide a conductive cushioning material having a buffer function that can be protected, and a method of manufacturing the conductive cushioning material that is simple and easy to manufacture. Disclosure of the invention
- the present inventors have conducted intensive studies and as a result, impregnated a conductive metal black-containing polyurethane resin-dissolved solution with a solvent into a conductive thin metal wire sheet, and performed steam humidification.
- the conductive cushion material was formed in the hot air, and the conductive cushion material had a high electromagnetic wave shielding effect.
- the conductive cushion material had many cavities (bubbles). As a result, it has been found that it is flexible and has an excellent cushioning effect.
- the present invention has been completed based on these findings.
- a conductive cushion material comprising a fiber aggregate (A) made of a conductive thin wire and an elastic resin (B) containing a conductive filler (C) At least a part of the end of the fiber assembly (A) is exposed from the outer surface of the cushion material, but the other part is embedded in the cushion material, and the elastic resin (B) provides a conductive cushion material characterized by having a large number of cavities therein while uniformly mixing the conductive filler (C).
- the conductive cushion material according to the first invention wherein the natural resin date (B) is polyurethane.
- the fiber aggregate (A) in the first or second invention, has a weight per unit area of 1 to 0.05 (Kg / m 2). ) Is provided.
- the conductive cushion material according to the third invention wherein the fiber aggregate (A) is a thin metal wire. It is.
- the conductive filler material (C) is carbon black, wherein the conductive cushioning material is carbon black.
- the compounding amount of the carbon black is 20 to 40% by weight based on the total amount of the elastic resin (B) and the carbon black.
- An electrically conductive cushion material is provided.
- the first step of dissolving the elastic resin (B) with a solvent to obtain an elastic resin solution in which the conductive filler (C) is mixed The second step of impregnating the resin solution into the fiber assembly (A) composed of conductive fine wires, removing the solvent in the non-conductive resin solution under high temperature and high humidity, and converting the resin into the elastic resin (B)
- the method for producing a conductive cushion material according to any one of the first to sixth inventions, which comprises a third step of forming a cavity, is provided.
- a fourth step of immersing in water or hot water to remove a solvent is added.
- the present invention is a conductive cushion material comprising a fiber aggregate (A) made of a conductive thin wire and an elastic resin (B) containing a conductive filler (C). At least a part of the end of the fiber assembly (A) is exposed from the outer surface of the cushion material, but the other part is embedded in the cushion material, and the elastic resin (B) is The present invention relates to a conductive cushion material having a large number of cavities therein while uniformly mixing the conductive filler (C). Preferred embodiments thereof include the following. Is done.
- the electric conductivity has an electric resistance value of 50 ( ⁇ / 3 cm) or less, the electromagnetic wave shielding performance is 45 (db) or more between 100 and 1 000 MHz, and is flexible.
- a conductive cushion material having a hardness of 30 or less in type A durometer hardness.
- FIG. 1 is a schematic sectional view showing the conductive cushion material of the present invention. Explanation of reference numerals
- the conductive cushion material of the present invention is a conductive cushion composed of a fiber aggregate (A) composed of a conductive thin wire and an elastic resin (B) containing a conductive filler (C). At least a part of the end of the fiber assembly (A) is exposed from the outer surface of the cushion material, but the other part is embedded in the cushion material, and the elastic resin (B) is characterized by having a large number of cavities therein while uniformly mixing the conductive filler (C). 1. Fiber assembly (A)
- the fiber aggregate (A) is composed of a conductive thin wire.
- the conductive thin wire can be appropriately used as long as it conducts electricity, such as a fiber or a metal thin wire or a carbon fiber whose surface is coated or coated with a conductor.
- the thin metal wire is more preferable because it has a low resistance and can obtain good conductivity.
- the thin metal wires include thin wires of brass, copper, aluminum-iron, stainless steel, and the like.
- the diameter of the conductive thin wire is preferably 100 / Xm or less from the viewpoint of the cushioning property of the conductive cushion material and the electric resistance value.
- the weight per unit area of the fiber aggregate 1 (K g / m 2 ) ⁇ 0. Is preferably in the range of 0 0 5 (K g / m 2).
- the weight of the fiber assembly If it is less than 0.005 (K g / m 2 ), the conductive effect and electromagnetic wave shielding effect will not be exhibited, while if it exceeds 1 (KgZm 2 ), it will be difficult to impregnate the elastic resin solution. However, it is not preferable because operability is deteriorated.
- the thickness of the fiber assembly may be variously changed depending on the desired thickness of the conductive cushion material, but is preferably in the range of 0.2 to 5 mm when left still.
- any resin having elasticity can be appropriately used, and examples thereof include polyurethane, polyurethane urethane, silicon resin, and unvulcanized rubber material.
- polyurethane has excellent mechanical properties, is inexpensive, and has the advantage that the desired physical properties, particularly hardness, can be easily changed by changing the mixing ratio of the raw materials constituting the polyurethane.
- Polyurethane is also preferable in this respect because it has a wide solvent selection range. The reason is that among the group of solvents that can dissolve polyurethane, there are many solvents that easily dissolve water.
- a vulcanization reaction may be carried out after adding a vulcanizing agent and a vulcanization aid while removing the solvent under high temperature and high humidity.
- the conductive filler (C) is added to improve the conductivity of the elastic resin (B).
- the conductive filler metal particles, carbon particles, and the like can be appropriately used.
- carbon black, Acetylene black used as a raw material is preferred.
- the conductive cushioning material of the present invention having excellent electromagnetic wave shielding performance and having a buffer function can be obtained by the following manufacturing method.
- the method for producing such a conductive cushion material is characterized by including the following 3 (I-III), 4 (I-IV), or 5 (I-V) steps.
- An elastic resin is dissolved in a solvent, and a conductive filler is mixed with the solvent to prepare an elastic resin solution.
- the solution is impregnated into a fiber assembly, and then the solvent is removed at high temperature and high humidity. To cure the elastic resin and create a cavity.
- Step II A fourth step in which the conductive cushion material obtained in III is further immersed in water or hot water to remove the solvent.
- Step I A fifth step in which the conductive cushion material obtained in I I or IV is pressed or hot pressed in order to adjust the thickness and improve the smoothness of the surface.
- the fiber aggregate (A) is a cushion material.
- the fiber aggregate such as a fine metal wire embedded and embedded in an elastic resin (B) containing a conductive filler (C), which constitutes the cushion material, is embedded in the end. It is desirable that at least a part of the portion is exposed on the outer surface of the cushion material, that is, the outer surface of the elastic resin (B) (see Fig. 1).
- the elastic resin has many cavities in order to impart cushioning properties. Of the cavities contained in the elastic resin, the shape and size of the cavities that can be visually observed are substantially spherical or elliptical spherical, and the minor diameter of the cavities is about 0.3 to 1 mm.
- This cavity can be formed by, for example, adding a foaming agent.
- the above-mentioned manufacturing method namely, dissolving an elastic resin in a solvent, and uniformly mixing a conductive filler with the resin are used.
- the elastic resin is cured by removing the solvent under high temperature and high humidity, for example, in steam-humidified hot air. A method of creating a cavity is preferred. Further, it is preferable that after the elastic resin is cured to some extent under high temperature and high humidity, it is immersed in water or hot water to further remove the solvent.
- the solvent used in the method for producing a conductive cushion material of the present invention can be appropriately used without any particular limitation as long as it dissolves elasticity and dissolves in water.
- urethane when urethane is used as the elastic resin, dimethylformamide (DMF), dimethylacetamide (DMAC), N-methyl-2-pyrrolidone (NMP) and the like can be suitably used.
- silicone resin tetrahydrofuran (THF) is used.
- acetone, methyl ethyl ketone (MEK) and the like can be used.
- the elastic resin solution mixed with the conductive filler (C) obtained in the step I according to the method for producing a conductive cushion material of the present invention may be, for example, carbon as the conductive filler. If black is used and polyurethane is used as the elastic resin, the concentration of the solution in which carbon black and polyurethane are dissolved depends on the mode of the conductive fiber aggregate, but may be appropriately impregnated. The concentration should be adjusted so that the stock solution concentration is easy. If the concentration of the undiluted solution is too low, the fiber aggregates will be greatly exposed after coagulation, and the polyurethane containing carbon black will form an extremely thin layer, which is not preferable.
- a preferred stock solution (solution in which carbon black and polyurethane are dissolved) has a concentration range of 7 to 12% by weight.
- the amount of the carbon black as the conductive filler is not particularly limited, as long as it is mixed according to the desired conductivity of the conductive cushion material. However, it is not preferable that the concentration of the carbon black is too low, since the conductive performance is reduced. On the other hand, if it is too high, the dispersion of carbon black becomes difficult and the viscosity of the stock solution increases sharply, so that the expected performance cannot be obtained and the power, operability and appearance of the conductive cushion material may be impaired. There is. Preferably, 20 to 40% by weight, more preferably 25 to 40% by weight, of the total amount of the elastic resin (B) and the carbon black is blended to obtain a conductive material having suitable performance and quality. Sex cushion material Obtainable.
- a brass thin wire sheet is used as the fiber assembly (A)
- polyurethane is used as the elastic resin (B)
- carbon black is used as the conductive filler (C).
- the method for producing the conductive cushion material of the present invention is not limited to this.
- DMF dimethylformamide
- the urethane solution and the conductive carbon black dispersion are measured and mixed to prepare a conductive carbon black-containing urethane solution.
- the mixing ratio is, for example, 30 parts by weight of the conductive carbon black dispersion to 70 parts by weight of the polyurethane solution. After mixing and stirring, leave for 1 hour to carry out natural defoaming, and proceed to the next step.
- FIG. 1 The conductive cushion material thus manufactured is shown in FIG. 1 as a schematic cross-sectional view.
- the fiber aggregate composed of the conductive thin wire is embedded in a polyurethane matrix in which conductive fine particles (for example, carbon black) are dispersed, and at least a part of the fiber aggregate is exposed to the surface.
- conductive fine particles for example, carbon black
- FIG. 1 when molding is performed under high temperature and high humidity, that is, in steam-humidified hot air, bubbles, that is, cavities are generated. The presence of bubbles (cavities) contributes to cushioning in a synergistic manner with the elasticity of polyurethane.
- the conductive cushion material of the present invention has a hardness of about 20 to 30 in type A durometer hardness.
- the conductive performance has an electric resistance value of 50 ( ⁇ / 3 cm) or less, and the electromagnetic wave shielding performance is a performance of approximately 45 (db) between 100 and 1000 MHz.
- the conductive cushion material of the present invention has the mechanical properties of the fiber assembly by embedding the conductive fiber assembly in the cushion material, that is, in the elastic resin constituting the cushion material.
- the properties similar to those of FRP (U) [fiber reinforced resin (urethane)] are exhibited, and the mechanical properties are improved.
- the conductive additive is kneaded into the elastic resin without using the fiber aggregate, the kneading ratio needs to be increased in order to exhibit sufficient conductivity.
- the performance of the elastic resin is adversely affected.
- the conductive cushion material of the present invention can effectively block electromagnetic waves leaking from the housing of information equipment such as a mobile phone, and can prevent electronic components that are relatively vulnerable to impact. It has a buffer function that can be protected, and can be suitably used as, for example, a liquid crystal protection buffer for a mobile phone. Examples and comparative examples
- the method for producing the conductive cushion materials of Examples 1 to 17 and Comparative Examples 1 to 3 and the method for evaluating the performance are shown below.
- a brass thin wire sheet is used as the fiber assembly (A)
- polyurethane is used as the elastic resin (B)
- carbon black is used as the conductive filler (C).
- Conductive carbon black [manufactured by Denki Kagaku Kogyo Co., Ltd. Product name: Denka black HS—100] was heated to 50 (g) and DMF was heated to 64.3 (g), and then subjected to dispersion treatment for 15 (minutes) with a homogenizer to obtain a concentration. 7 (% by weight) of a carbon black solution was prepared. The concentration of the carbon black solution was used in accordance with the concentration of the polymer solution used for preparing the composite.
- the brass wire aggregate (hereinafter, referred to as a brass sheet) was degreased or washed with methylene chloride as necessary, and used for preparing a cushion material.
- the brass sheet has a brass wire diameter (hereinafter referred to as a wire diameter) constituting the sheet of about 50 ( ⁇ m) and a brass sheet weight per square meter (hereinafter, referred to as a basis weight) of about 400 (g / m 2 ) was used.
- the brass sheet was cut into approximately 50 (mm) squares and placed in a polypropylene tray (size 300 mm x 210 mm x 37 mm). Next, 100 (g) of the carbon black-containing polymer solution was metered into the tray, and air bubbles derived from the thin wire sheet were removed while shaking the fine wire sheet with tweezers.
- a polypropylene tray containing a brass sheet and a polymer solution containing carbon black was placed in a stainless steel tray (size 600 mm X 300 mm X 120 mm) filled with about 60 (° C) hot water 3 (1).
- the mixture was humidified and heated in an atmosphere of 90 (° C) and a relative humidity of 50 (RH%) for about 60 (minutes) to remove the solvent and solidify.
- the solidified conductive cushion material was immersed in water for about 12 (h) or more and then air-dried. Thus, a conductive cushion material was prepared.
- the appearance of the conductive cushion material was visually evaluated and judged.
- the evaluation criteria are as follows.
- the presence or absence of voids in the conductive cushion material was visually determined.
- ⁇ An almost flat surface except that the brass fine wire is exposed and the carbon black-containing polyurethane part has some depressions.
- Brass fine wire is exposed, and it is exposed to the polyurethane part containing carbon black.
- the surface is generally flat except for a few concavities.
- X A brass fine wire part having no polyurethane part containing carbon black (uncoated part).
- the hardness of the conductive cushion material was measured according to JISK 7215 “Durometer hardness test method for plastics”.
- the type A durometer hardness of the cushion material which is low in hardness and without hot pressing, is about 20 to 30.
- ⁇ A type hardness of 30 or less.
- ⁇ A type hardness of more than 30 to 40 or less.
- ⁇ A type hardness of more than 40 to 50 or less.
- X A type hardness of more than 50.
- the open surface of the conductive cushion material (the surface that is not in contact with the container at the time of preparation: hereinafter referred to as the front surface) and the container contact surface (the surface that is in contact with the bag: hereinafter referred to as the back surface) are each a digital multimeter [ Electric resistance was measured with a custom made CDM-11 HD type.
- the cushion material used for the measurement was a sample cut off to a 50 (mm) square, and a mark was applied every 10 (mm) around the inner side of 10 (mm) from the outer periphery.
- the test lead was pressed against the vicinity of an arbitrary mark, and the other test lead was pressed against the other face (the measurement interval at this time was 3 Omm) to read the resistance value.
- measurements were taken in the vicinity of another mark part and its facing part, and a total of eight points were measured for one sample, and evaluated by the average value.
- the sample is measured on both sides, It was noted in.
- the surface electric resistance is low, and the electric resistance value of both surfaces is 50 ( ⁇ / 3 cm) or less.
- the best low is 1-3 (QZ3 cm).
- Electric resistance value is 10 ( ⁇ 3 (: ⁇ )) or less.
- ⁇ Electric resistance value of more than 10 to 50 ( ⁇ 3 cm) or less.
- ⁇ Electric resistance value of more than 50 to 100 (QZ 3 cm) or less.
- the electromagnetic shield measurement tester was set in a state where there was nothing inside, and the reference level (E 0) was measured.
- the shield material cut into a square of 150 (mm) was set in an electromagnetic shield measurement tester, and the reception level (E 1) was measured (KEC method).
- the shielding effect (S) was calculated by the following equation.
- the measurement was performed at a frequency of 0.15 to 1000 (MHz).
- the electromagnetic shield measuring instrument uses MA 8602 made by ANR ITSU (Anritsu), and the spectrum analyzer uses TR 417 3 made by ADVANTE ST (Advantest). , Were subjected to the measurement.
- the electromagnetic wave shielding performance was assumed to have a performance of approximately 45 (db) between 100 and 100 (MHz).
- ⁇ The shield effect is less than 15 to 45 (db).
- ⁇ Shield effect less than 5 to 15 (db).
- the shield effect is less than 5 (db).
- Example 1 is as described above, but in Example 13 the type and amount of raw materials are as shown in Table 3, and the preparation method is the same as in Example 1. Was carried out.
- the processing method by the hot press was performed by hot pressing the conductive cushion material with an iron.
- the heating surface set temperature of the iron was 210 (° C), and the iron was pressed horizontally against a 50 (mm) square conductive cushion material for about 30 seconds.
- a conductive cushion material was prepared by vacuum heating, and the types and amounts of the raw materials were in accordance with Table 3.
- the preparation method was the same as that in Example 1 until the preparation of the polymer solution, the preparation of the carbon black solution, and the preparation of the carbon black-containing polymer solution.
- the subsequent preparation of the conductive cushion material was performed by the following method.
- the brass sheet was degreased or washed with methylene chloride as needed, and used for the preparation of the cushioning material.
- the brass sheet has a brass wire diameter of about 50 ( ⁇ m) and a brass sheet weight of about 100 (gm PP) per square meter.
- the brass sheet is about 50 (mm). ) Cut into corners and placed in a polypropylene tray (size 300 mm x 210 mm x 37 mm) Then weigh 100 g of the carbon black-containing polymer solution into the tray and add brass. The sheet was shaken with tweezers to remove bubbles from the sheet.Then, the polypropylene tray containing the above preparation was placed in a vacuum dryer and vacuumed at 50 (° C) 76 (cmHg). Leave for 18 hours The solvent was prepared by volatilizing DMF.
- the types and blending amounts of the raw materials follow Tables 1 to 3, and the preparation method was the same as in Example 1.
- the physical properties and the like of the obtained conductive cushion material were measured and evaluated.
- Tables 1 to 3 show the composition of the conductive cushion material and the evaluation results of the physical properties.
- the conductive cushion materials obtained in Examples 1 to 17 are excellent in hardness, conductivity, electromagnetic wave shielding performance, and appearance.
- the conductive cushion material of Comparative Example 1 which was formed by vacuum heating instead of steam humidification and had no cavities, resulted in high hardness and lack of flexibility (cushioning property). . Further, in Comparative Example 2 in which only the brass thin wire sheet was used, the brass thin wires were broken and could not be used. Further, in Comparative Example 3 in which the amount of the undiluted solution applied was large, all of the brass thin wires were buried in the cushion material, and the electrical resistance value did not reach the pass standard. The reason for this is not clear, but is presumed to be as follows.
- the complete burial of the highly conductive brass fiber means that the elastic resin layer containing the conductive filler (carbon black) on the surface of the conductive cushion material becomes thicker, in other words, the electrical resistance. It is presumed that the path with slightly higher electrical resistance in the conduction path during measurement becomes longer. Therefore, the electrical resistance of the elastic resin layer containing the conductive filler (that is, it is governed by the content of carbon black) and the path length to the closest metal wire (that is, the carbon black contained in the metal wire contains (Thickness of the non-conductive resin coating). That is, when the electric resistance of the elastic resin layer containing the conductive filler is low and the coating thickness of the thin metal wire is short, the electric resistance value as the conductive tubing material is low, which is preferable.
- the conductive fiber aggregate is three-dimensionally arranged in the cushion material (that is, in the elastic resin).
- the mechanical properties of the fiber assembly By being buried, it is possible to have the mechanical properties of the fiber assembly, to be excellent in mechanical properties, and to be excellent in conductivity and electromagnetic wave shielding performance.
- it has stable conductivity (that is, isotropic conductivity) in the surface, in the thickness direction, and in the width and width directions. Furthermore, there is little risk of losing conductivity due to external forces such as impact and friction.
- the method for imparting conductivity according to the present invention expresses conductivity sufficient for the intended use by combining industrially versatile materials (fiber aggregates and carbon black). .
- an elastic resin solution containing a conductive filler is applied from a conductive fiber aggregate on a carrier using a commercially available coating machine or the like.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003301385A AU2003301385A1 (en) | 2002-10-18 | 2003-10-15 | Conductive cushion material and process for producing the same |
EP20030756616 EP1553813A1 (en) | 2002-10-18 | 2003-10-15 | Conductive cushion material and process for producing the same |
US10/531,325 US20060110998A1 (en) | 2002-10-18 | 2003-10-15 | Conductive cushion material and process for producing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002-304328 | 2002-10-18 | ||
JP2002304328A JP2004140224A (ja) | 2002-10-18 | 2002-10-18 | 導電性クッション材料及びその製造方法 |
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WO2004036973A1 true WO2004036973A1 (ja) | 2004-04-29 |
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PCT/JP2003/013175 WO2004036973A1 (ja) | 2002-10-18 | 2003-10-15 | 導電性クッション材料及びその製造方法 |
Country Status (7)
Country | Link |
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US (1) | US20060110998A1 (ja) |
EP (1) | EP1553813A1 (ja) |
JP (1) | JP2004140224A (ja) |
KR (1) | KR20050067185A (ja) |
CN (1) | CN1695410A (ja) |
AU (1) | AU2003301385A1 (ja) |
WO (1) | WO2004036973A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006128741A1 (en) * | 2005-06-02 | 2006-12-07 | Nv Bekaert Sa | Polymer emi housing comprising conductive fibre |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US7813634B2 (en) | 2005-02-28 | 2010-10-12 | Tessera MEMS Technologies, Inc. | Autofocus camera |
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Also Published As
Publication number | Publication date |
---|---|
CN1695410A (zh) | 2005-11-09 |
AU2003301385A1 (en) | 2004-05-04 |
US20060110998A1 (en) | 2006-05-25 |
KR20050067185A (ko) | 2005-06-30 |
EP1553813A1 (en) | 2005-07-13 |
JP2004140224A (ja) | 2004-05-13 |
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