CN101224649A - Metallic textile with radiation capability and electromagnetic interference shielding efficiency and manufacturing method thereof - Google Patents
Metallic textile with radiation capability and electromagnetic interference shielding efficiency and manufacturing method thereof Download PDFInfo
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- CN101224649A CN101224649A CNA2007100024082A CN200710002408A CN101224649A CN 101224649 A CN101224649 A CN 101224649A CN A2007100024082 A CNA2007100024082 A CN A2007100024082A CN 200710002408 A CN200710002408 A CN 200710002408A CN 101224649 A CN101224649 A CN 101224649A
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Abstract
The invention discloses a metallized fabric, which has both a heat dissipation property and an electromagnetic wave interference (EMI) shielding property. The invention can be applied to a heating element and the surrounding environment of the element so as to dissipate heat and provide the electromagnetic wave interference shielding. Furthermore, the metallized fabric of the invention also has heat conductivity and electric conductivity also. The invention also discloses a method used for preparing the fabric.
Description
Technical field
The present invention relates to the technical field of conductive fabric, relate to a kind of metallized fabrics that has thermal diffusivity and electromagnetic interference shielding efficiency (electromagnetic interference (EMI) shielding property) concurrently in particular, and preparation method thereof.
Background technology
General computer module, electronic product element or machinework etc. can continue to produce too much heat in the process of work running, can radiating components such as fan, fin or heat pipe be installed in equipment usually, to alleviate the problem of too much heat.In the general computer module and electronic product element, use metallized fabrics to prevent from influence the misoperation usefulness that himself or other e-machine produce by the electromagnetic wave that e-machine leaks or produces.
Existing many publication document illustrations have the material and the manufacture method of electromagnetic interference shielding efficiency.For example, on December 2nd, 2004, disclosed KR20040100803 disclosed a kind of multiply cloth, the intermediate layer (2) that it comprises tissue layer (1) and (3) and has water evaporation/waterproof action, high strength or electromagnetic interference shielding efficiency, these 3 layers engage with yarn and to become compound fabric.On August 13rd, 1991, disclosed KR910006108B disclosed the method that a kind of manufacturing can be resisted the flexible veil of the microwave in the big range of wavelengths, it comprises (1) the anti-electronic material of carbon or chromium is coated on the braided fabric, to form an anti-electron membrane thereon, (2) the CF dipole element that will be selected from aluminium, gold, silver, copper or nickel is coated on the described film, to form the membranaceous surface element of a conduction.
On May 24th, 2006, disclosed CN1778156A disclosed a kind of many plane electromagnetic waves interference shielding liner and manufacture method thereof, many planes electroconductive gasket material of its announcement, comprise foam core, the conductive net layer of one deck at least that contains the mixture of conductive fiber and non-conductive fibre, the composite fibre of described foam core and described reinforcement fabric is passed in the distribution of reinforcement fabric and predetermined quantity.
On October 2nd, 2003, disclosed US 2003/0186602 A1 disclosed a kind of material that is used to avoid the Electromagnetic Interference and the radio frequency interference of electronic conductor and surrounding environment, it comprises the collapsible fabric fibre of a heating, has been coated with one deck conductive paste on the described fiber.
In addition, on September 5th, 2003, disclosed JP 2003-249781 disclosed a kind of laminated thing of heat conductive sheet shape with electromagnetic interference shielding efficiency, it has following architectural feature: covered up at least one laminar surface of fibrous substrate material sheet material of metal level, piled up the soft resin layer that contains the thermal conductivity filler.Braided fabric, knitted or woven fabrics or the adhesive-bonded fabric fiber that the open case of this Japan Patent is used thin specification as described fibrous substrate material sheet material and with acrylic acid series substrate polymer or silicon base polymer as the described soft resin layer component that contains the thermal conductivity filler.
In the application of electronic product, still need a kind of metallized fabrics that has thermal diffusivity and electromagnetic interference shielding concurrently.
Summary of the invention
The invention provides a kind of metallized fabrics that satisfies the demand and preparation method thereof.
On the one hand, the invention provides a kind of metallized fabrics, it has thermal diffusivity and electromagnetic interference shielding efficiency concurrently.The surface-coated of metallized fabrics of the present invention contain the resin bed of phase-transition material, so can be with the heat absorption that received, conduct and shed.In addition, metallized fabrics of the present invention also has thermal conductivity and electric conductivity.
Metallized fabrics of the present invention comprises a fabric (11), and a metal level (12) and that covers at least a portion surface of described fabric is coated the resin bed that contains phase-transition material (14) (13) on the described metal level, as shown in Figure 1.According to a preferred aspect of the present invention, metalized and coating are carried out in two surfaces at described fabric, therefore form fabric as shown in Figure 2, tool comprises a fabric (21), be covered in two lip-deep metal level (22a of described fabric, 22b) and coat the resin bed that contains phase-transition material (24) on the metal level (23a, 23b).
Fabric among the present invention (11) and (21) are as substrate, and it is made into by natural fiber, staple fibre or its mixture.The natural fiber that the present invention uses can be any natural fiber, for example (but being not limited to) cotton, fiber crops, silk or hair; Staple fibre can be any staple fibre, and for example (but being not limited to) rayon fibers, nylon fiber, polyester fiber or acryl fiber are preferably polyester fiber.In the present invention, staple fibre preferably has about 5 red Buddhist nuns to about 75 red Buddhist nuns, has the fabric of about 0.045mm to the thickness of about 0.14mm to be made into.The fabric that is made into can be any braid pattern such as flat fabric, adhesive-bonded fabric, screen cloth or looped fabric.
Usually, for example can use the alloy of (but being not limited to) copper, nickel, aluminium, gold, silver, titanium, silicon, these materials or the metal level on its mixture formation fabric face of the present invention.Preferably, fabric of the present invention has the thickness of about 0.05mm to about 0.15mm after metallization.This metal level not only can be given the present invention the electric conductivity of weaving cotton cloth, and also can give electromagnetic interference shielding efficiency.Usually, the electromagnetic interference shielding efficiency of metallized fabrics of the present invention can reach more than 99% (60dB), preferably more than 99.9999%.The electromagnetic interference shielding efficiency that preferred aspect of the present invention obtains according to ASTM D4935 standard testing as shown in Figure 3.
Resin used in the present invention can be the resin of any pattern, for example (but being not limited to) polyurethane resin, acrylic resin, alkyd resins, epoxy resin and composition thereof.Usually, the viscosity of described resin is about 3, and 000cps is to about 20, and 000cps is preferably approximately 5, and 000cps is to about 10,000cps.
Required energy when phase-transition material can absorb heat as its phase change.When phase-transition material absorbed heat, temperature can be sluggish in phase change fusing point a period of time.Therefore, when phase-transition material covers or is pasted on metal or nonmetal thermal source surface, heat can be absorbed (at this moment by the phase change material soon, phase-transition material is by the solid-state liquid state that changes into) diffuse to again in the air (at this moment, phase-transition material is changed into solid-state by liquid state), ringing a large amount of heats that can effectively reduce thermal source and produced so reach the purpose of radiating and cooling.
Be applicable to that phase-transition material of the present invention can be any material with phase change characteristic, for example (but being not limited to) high carbon number alkanes, high carbon number alcohols, organic acid and composition thereof.Herein, " high carbon number alkanes " is meant the alkanes that contains the carbon atom more than 12 or 12, preferably contains 12 to 20 carbon atoms, and specific kind is (but being not limited to) n-eicosane for example." high carbon number alcohols " is meant the alcohols that contains the carbon atom more than 12 or 12, preferably contains 12 to 20 carbon atoms, and specific kind is (but being not limited to) fatty alcohol for example, as polyethylene glycol." organic acid " is meant any organic acid that contains the carbon atom more than 12 or 12, preferably contains 12 to 20 carbon atoms, and specific kind is (but being not limited to) aliphatic acid for example, as palmitic acid.Preferably use under 50 to 200 ℃, especially under 75 to 175 ℃, have the phase-transition material of tangible phase change heat absorption capacity, so that preferable heat conduction and thermal diffusivity to be provided.Fig. 4 shows after n-eicosane/polyethylene glycol/palmitic acid three is mixed in resin according to 1: 1: 1 ratio and scans the latent heat excursion that calorimetry (DSC) obtains according to differential.According to Fig. 4, have tangible phase change heat absorption capacity at 75～175 ℃, be good heat sink material.
The consumption of phase-transition material can be 5 to 25 weight % usually among the present invention, preferably 10 to 20 weight %.The consumption of resin can be 75 to 95 weight % usually, preferably 80 to 90 weight %.
Coat aforementioned metal fabric face and after drying when phase-transition material and mixed with resin, can form the resin bed that one deck have heat conduction and thermal diffusivity concurrently on the surface of described metallized fabrics.Referring to Fig. 5, this figure shows the heat radiation process of the resin bed that contains phase-transition material.When the heat of heater element generation is delivered to phase-transition material, phase-transition material just can produce phase change with the balance environment temperature, in the temperature range that latent heat changes,, reach the purpose of heat conduction and heat radiation by the heat (high temperature) of pyrotoxin and the effect back and forth between cool ambient air (low temperature).
Usually, the described thickness that contains the resin bed of phase-transition material can be more than the 0.05mm, is preferably 0.1mm to 0.3mm.
On the other hand, the invention provides the method that a kind of preparation has the metallized fabrics of thermal diffusivity and electromagnetic interference shielding efficiency concurrently, it comprises following steps:
One fabric is provided;
Metallize at least a portion surface at described fabric, to form a metallized fabrics; With
Coating one contains the resin bed of phase-transition material on the metal level of described metallized fabrics.
Preferably, carry out fabric face metallized before, carry out the fabric face upgrading earlier, to promote fabric face metallized effect.The fabric face upgrading can any known physical property or the chemistry modification technology carry out, the physical property modification technology for example handle and washing is handled by (but being not limited to) plasma treatment, corona (corna), and for example handle, alkali lye is handled and interfacial agent is handled by (but being not limited to) acid solution for the chemistry modification technology.
Fabric face metallized technology is that those skilled in the art in the invention are known.Can any known technology carry out fabric face metallized, (but being not limited to) evaporation (Evaporation), sputter (Sputtering) and electroless plating (Electroless Plating) for example.Usually can metallize at the single or double of fabric, preferably carry out the double-sided metalization of fabric with electroless plating.
Usually, evaporation is that fabric is placed (for example under the pressure of 0.0001torr～0.1torr) in the vacuum cavity, add proper metal (for example alloy of (but being not limited to) copper, nickel, aluminium, gold, silver, titanium, silicon or these materials), under the high temperature that is enough to the described metal of oxidation with burning, fabric is cooled off rapidly, form the surface through metallized fabric.
Sputter is that fabric is placed (for example under the pressure of 0.0001torr～0.1torr) in the vacuum cavity, feed suitable gas (for example (but being not limited to) argon), with for example power is that 50 to 1000 watts direct current excites plasma, formed plasma then clashes into metal targets, with metal (for example (but being not limited to) copper, nickel, aluminium, gold, silver, titanium, silicon or other metal, or its alloy) strikes fabric face, form the surface through metallized fabric.
Electroless plating is that fabric is immersed electroless plating liquid, with control autocatalysis method of reducing with metal-plated on fabric.Employed metal can be any electric conductivity good metal in the electroless plating, for example (but being not limited to) copper, nickel, silver, gold or its alloy.Preferably carry out electroless plating copper and electroless nickel plating method and form the surface through metallized fabric.According to an enforcement aspect of the present invention, carry out electroless plating according to following flow process:
Preimpregnation (Pre-dip) → activation (Catalyst) → washing (Water Rinse) → speedization (Accelerator) → washing (WaterRinse) → change copper (ElectrolessCopper) → washing (WaterRinse) → little activation (Activator) → washing (Water Rinse) → change nickel (Electroless Nickel) → washing (Water Rinse) → oven dry (Dry) → finished product.
Can any known technology carry out the mixture of this phase-transition material and resin is coated the step of aforementioned metal fabric face, for example (but being not limited to) cutter is coated with method (Knife Coating), and drawing together and being coated with thickness is more than the 0.05mm.
After the mixture of phase-transition material and resin coated the aforementioned metal fabric face, can use any known technology with this fabric drying, for example, can be at room temperature dry, perhaps dry in baking oven under 80 ℃ to 150 ℃ temperature.
In aspect a preferred enforcement of the present invention, can in the mixture of phase-transition material and resin, add various additives, make the gained fabric have the character of expectation, for example dissolve in color.In addition, also can on fabric outermost layer of the present invention, carry out pattern-printing and dyeing.
Description of drawings
Fig. 1 is an aspect of metallized fabrics of the present invention.
Fig. 2 for metallized fabrics of the present invention on the other hand.
Fig. 3 shows the electromagnetic interference shielding efficiency that obtains after preferred aspect of the present invention is according to ASTM D4935 standard testing.
Fig. 4 shows after n-eicosane/polyethylene glycol/palmitic acid three is mixed in resin according to 1: 1: 1 ratio and scans the latent heat excursion that calorimetry (DSC) obtains according to differential.
Fig. 5 shows the heat radiation process of the resin bed that contains phase-transition material.
Fig. 6 shows the heat dissipation curve of fabric sample A and fabric sample B among the embodiment.
The specific embodiment
Following examples are used for that the invention will be further described, but not in order to limit the scope of the invention.The modifications and variations that those skilled in the art in the invention can reach easily include in this case specification disclosure and appended claims.
I., fabric is provided
According to known way, provide a kind of fabric with following character: contain the polyester fiber of 94/inch of warp thread 75 red Buddhist nuns/36 fiber numbers, weft yarn 75 red Buddhist nuns/36 fiber numbers, 116/inch of warp-wise density and latitudinal densities, thickness is 0.06mm.
With this fabric is substrate, makes fabric sample A (through the resin bed that surfaction is handled, metallization and coating contain phase-transition material) and fabric sample B (only handle and metallize through surfaction, but the uncoated resin bed that contains phase-transition material).
II. the fabric face upgrading is handled
Carry out the surfaction of fabric sample A and B under following operating condition handles in corona (Corona) mode: 10 amperes in electric current, and power 2KW, corona beam outlet and fabric sample A and B are apart from 5mm.This upgrading is handled and can be made the surface of fabric sample A and B have roughness, and its wetting tension rises to more than the 40Dyne/cm from 10Dyne/cm.
III. fabric face metallized
In the electroless plating mode, carry out the surface metalation of fabric sample A and B according to following flow process:
Preimpregnation (10%HCl, 2 minutes, 30 ℃) → activation (palladium salt or pink salt, 2 minutes, 30 ℃) → washing (water, 2 minutes, room temperature) → speedization (10%HCl, 2 minutes, 30 ℃) → washing (water, 2 minutes, room temperature) → change copper (mantoquita, 19 minutes, 45 ℃) → washing (water, 2 minutes, room temperature) → little activation (palladium salt or pink salt; 2 minutes, 30 ℃) → washing (water, 2 minutes, room temperature) → change nickel (nickel salt, 3 minutes, 40 ℃) → washing (water, 2 minutes, room temperature) → oven dry (drying, 1～3 minute, 90 ℃) → finished product.
IV. coating contains the resin bed of phase-transition material
The resin bed that contains phase-transition material of on fabric sample A, filling a prescription below the applying implenent:
Component weight %
High carbon number alkane (n-eicosane) 5
High carbon number alcohol (polyethylene glycol) 5
Organic acid (palmitic acid) 5
Polyurethane resin 85
Processing mode: being coated with method formation thickness with cutter is the resin bed of 0.2mm.
Drying condition: oven dry is 60 seconds under 95 ℃ temperature.
V. thermal diffusivity assessment
＜method 〉
Fabric sample A and fabric sample B are positioned on the heating copper test seat (coated face of fabric sample A up) simultaneously, closely be fixed in fabric sample A and fabric sample B on the heated plate with heat-resistant adhesive, and feeding power supply (4.51W) heating, heating surface (area) (HS is (3 * 3=9cm
2), be 3 hours heat time heating time, during measure variations in temperature with land surface pyrometer.
＜result 〉
The heat dissipation curve of fabric sample A (through the resin bed that surfaction is handled, metallization and coating contain phase-transition material) and fabric sample B (only handle and metallization through surfaction, but the uncoated resin bed that contains phase-transition material) as shown in Figure 6.According to the result of Fig. 6 as can be known, after 1,000 second, the top layer of fabric sample A and fabric sample B begins to produce temperature contrast.After 1,500 second, the MTD on fabric sample A and fabric sample B top layer reaches 5 ℃.Can know clearly that by described result metallized fabrics of the present invention has more excellent thermal diffusivity.
Claims (14)
1. metallized fabrics that has thermal diffusivity and electromagnetic interference shielding efficiency concurrently, it comprises fabric, cover described fabric at least one surface metal level and coat the resin bed that contains phase-transition material on the described metal level.
2. metallized fabrics according to claim 1, wherein said metal level is made of the metal of the group that alloy that is selected from copper, nickel, aluminium, gold, silver, titanium, silicon, these materials and composition thereof is formed.
3. metallized fabrics according to claim 1, wherein said resin is selected from the group that polyurethane resin, acrylic resin, alkyd resins, epoxy resin and composition thereof are formed.
4. metallized fabrics according to claim 1, wherein said phase-transition material are selected from the group that high carbon number alkanes, high carbon number alcohols, organic acid and composition thereof are formed.
5. metallized fabrics according to claim 1, two surfaces of wherein said fabric all cover metal level.
6. metallized fabrics according to claim 5 all is coated with the resin bed that contains phase-transition material on the described two metal layers of wherein said fabric.
7. metallized fabrics according to claim 1, wherein said fabric is made into by natural fiber, staple fibre or its mixture.
8. method for preparing the metallized fabrics that has thermal diffusivity and electromagnetic interference shielding efficiency concurrently, it comprises following steps:
Fabric is provided;
Metallizing at least a portion surface at described fabric, forms metallized fabrics; With
Coating contains the resin bed of phase-transition material on the metal level of described metallized fabrics.
9. method according to claim 8, wherein said metallization is undertaken by the mode of evaporation, sputter or electroless plating.
10. method according to claim 8, wherein said metal level is made of the metal of the group that alloy that is selected from copper, nickel, aluminium, gold, silver, titanium, silicon, these materials and composition thereof is formed.
11. method according to claim 8, wherein said resin is selected from the group that polyurethane resin, acrylic resin, alkyd resins, epoxy resin and composition thereof are formed.
12. method according to claim 8, wherein said phase-transition material are selected from the group that high carbon number alkanes, high carbon number alcohols, organic acid and composition thereof are formed.
13. method according to claim 8, it further is included in before the described surface metalation step, carries out the fabric face upgrading.
14. method according to claim 13, wherein said fabric face upgrading are to be undertaken by the mode that plasma treatment, washing processing, corona (corna) processing, acid solution processing, alkali lye processing or interfacial agent are handled.Method according to claim 8, wherein said fabric is made into by natural fiber, staple fibre or its mixture.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100024082A CN101224649A (en) | 2007-01-17 | 2007-01-17 | Metallic textile with radiation capability and electromagnetic interference shielding efficiency and manufacturing method thereof |
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| CNA2007100024082A CN101224649A (en) | 2007-01-17 | 2007-01-17 | Metallic textile with radiation capability and electromagnetic interference shielding efficiency and manufacturing method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102483185A (en) * | 2010-03-31 | 2012-05-30 | 东海橡塑工业株式会社 | Fuel hose and method for manufacturing the same |
| CN102711421A (en) * | 2012-06-28 | 2012-10-03 | 东莞市群跃电子材料科技有限公司 | Shielded radiating material structure and manufacturing method |
| CN103660442A (en) * | 2012-09-24 | 2014-03-26 | 财团法人纺织产业综合研究所 | Method and apparatus for producing functional short fiber |
| CN104999763A (en) * | 2015-06-19 | 2015-10-28 | 安徽工程大学 | Preparation method of flexible nanometer interface composite textile material |
-
2007
- 2007-01-17 CN CNA2007100024082A patent/CN101224649A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102483185A (en) * | 2010-03-31 | 2012-05-30 | 东海橡塑工业株式会社 | Fuel hose and method for manufacturing the same |
| CN102711421A (en) * | 2012-06-28 | 2012-10-03 | 东莞市群跃电子材料科技有限公司 | Shielded radiating material structure and manufacturing method |
| CN103660442A (en) * | 2012-09-24 | 2014-03-26 | 财团法人纺织产业综合研究所 | Method and apparatus for producing functional short fiber |
| CN104999763A (en) * | 2015-06-19 | 2015-10-28 | 安徽工程大学 | Preparation method of flexible nanometer interface composite textile material |
| CN104999763B (en) * | 2015-06-19 | 2019-02-12 | 安徽工程大学 | A kind of preparation method of flexible nano interface composite material for weaving |
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Application publication date: 20080723 |