TWI329324B - Electro magnetic shielding cable - Google Patents

Description

1329324 九 五 曰 页 、 、 、 、 、 、 、 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 . . . . . . . . . . . . . . . . . . . . . . . slow. ─, electromagnetic shielding [Prior Art] Electromagnetic shielding line is more commonly used in the electronics industry, 'micro-scale electromagnetic shielding _ is more widely used. „In the instrument and space equipment. The traditional cable has two internal settings: the conductor is used to transmit the electrical signal, and the outer conductor is used to shield the electrician of the transmission wheel =, = it is enclosed inside, so that the line is high. Low frequency loss, corpse = strong interference capability, use frequency bandwidth, etc. _Opening anti-normal case, electromagnetic shielding Wei (four) to the outer conductor of the inner conductor, covering the outer surface of the (four) outer insulation The shielding layer and the outer sheath of the conductor, wherein the core is used to transfer the metal in the material, and the copper or copper-zinc alloy is mainly used. The shielding layer is usually formed by wrapping a plurality of gold-clad film on the outside of the insulating medium layer for Shield electromagnetic interference or... Interference with external signals. For the shielding layer of metal wire weaving, the content of metal wire and the tightness of weaving will affect its anti-interference ability: Obtain a good shielding effect, usually, the metal wire in the shielding layer The content of the material is relatively large. It needs to be _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ And metal film roll shape The shielding 成 is far lower than the production speed of the cable core in the production speed, and is the main factor limiting the electromagnetic shielding wire. In addition, the metal wire or 7 1329324 is used in large quantities.

The metal film material is high as a shielding layer. The production cost of the electromagnetic screen cable is also better than that of the internal one. It is a kind of electromagnetic shielding Wei, which has good electromagnetic shielding performance and is easy to manufacture, and is suitable for low-cost mass production. Clothing [Summary] ::: A detailed description of an electromagnetic shielding line by means of a detailed example

It has good electromagnetic shielding effect and simple structure for low-cost large-scale production. An electromagnetic shielding comprising at least m covering at least an insulating dielectric layer outside the core, at least an electromagnetic shielding layer and an outer sheath, wherein the electromagnetic shielding layer is composed of a plurality of carbon nanotube strings. Compared with the prior art, the present invention forms an electromagnetic shielding layer by a carbon nanotube rope. The 'nano carbon tube has good electrical conductivity so that the shielding layer has a strong shielding effect, and the shielding layer is compared with the prior art. The medium braided metal wire or the coiled metal film has a simple structure and is therefore suitable for mass production at low cost.

[Embodiment] Hereinafter, the structure of an electromagnetic shielding cable of the present invention and a manufacturing method thereof will be further described in detail with reference to the accompanying drawings. The electromagnetic shielding cable of the present invention comprises at least one cable core, at least one insulating dielectric layer covering the outer core, at least one electromagnetic shielding layer and an outer sheath. Referring to FIG. 1, an electromagnetic shielding wire mirror 1 according to a first embodiment of the present invention is an electromagnetic shielding coaxial cable, comprising a cable core 110, an insulating dielectric layer 120 covering the outer surface 8 of the cable core 110, and being covered with an insulating medium. The shielding layer l3 outside the layer 120 and the outer sheath 140 covered on the outside of the shielding layer 130. The core HQ, the fibrous dielectric layer 120, the shielding layer 130 and the outer sheath 140 are coaxially disposed. The core 110 may be formed from a single conductive core or may be formed by intertwining a plurality of conductive filaments, only a single conductive core being shown in the drawings. Conductive, 'or conductive filaments are made of conductive materials. Conductive metal materials, conductive metal alloy materials, nano carbon pipes or composite conductive materials containing carbon nanotubes can be used. Among them, the conductive metal material is preferably copper or aluminum. The conductive metal alloy material is preferably a copper-zinc alloy or a copper-silver alloy, wherein the percentage of copper in the copper alloy is about 70%, and the percentage of copper in the copper-silver alloy is about 10%. 40%, the percentage of silver quality is about ~9〇%. The nano carbon line is a combination of a plurality of carbon nanotubes that are connected end to end to form a predetermined length of carbon nanotube bundles. The carbon nanotube composite conductive material is composed of a material of nanometer stone and 3 conductive metal. Preferably, the carbon nanotube composite conductive material is made of a carbon nanotube and a copper-containing material, and the copper-containing material is preferably copper, copper-zinc alloy or copper-silver alloy. When the carbon nanotube composite material is composed of copper and carbon nanotubes, the weight percentage of the carbon nanotubes in the copper material is about %·01%~2%; when the carbon nanotube composite material is composed of copper-zinc alloy and When the carbon nanotubes are composed, the weight percentage of copper in the copper-zinc alloy is about 7〇%, and the weight-to-weight ratio is about 30%. The weight percentage of the carbon nanotubes in the copper-zinc alloy is about 〇' 01%. ~2% n tree tube reconstitution consists of ship alloy and carbon nanotubes. The weight percentage of steel in the alloy is about 10%~40%, the weight of silver is ', and the spoon is 6 (U 90% 'nano The weight percentage of the carbon tube in the copper-silver alloy is about %·01%~2%. 1329324 -------- 年月(1)^文) The 绝缘 瞀, the dielectric layer 12G is used for electrical insulation, optional Poly read ethylene or nano-clay - still molecular composites. Nano-clay_polymer composite material, nano-layered structure of niobate minerals, composed of a variety of hydrated bismuth and bismuth alumina, metal oxides and soil metal oxides, And become 'with fire-resistant flame retardant and other excellent characteristics' such as nano kaolin or nano montmorillonite. The molecular material may be selected from the group consisting of ruthenium resin, polyamide, polyolefin, such as polyethylene, to propylene, etc., but not limited thereto. In this embodiment, the nano montmorillonite _ ♦ ethylene composite material is preferred, which has good electrical insulation, fire-resistant flame retardant, low smoke and no (four) escaping, not only can provide effective electrical insulation for the voyage, protect the cable core, and at the same time satisfy Environmental requirements. The shield layer 130 is composed of a plurality of carbon nanotube ropes which are directly or woven into a mesh shape and wound around the insulating medium layer 12. Each of the carbon nanotube strings includes a plurality of carbon nanotube bundle segments from a nanotube bundle array length &, each of the carbon nanotube bundle segments having substantially equal lengths and each of the carbon nanotube bundle segments being parallel to each other A carbon nanotube bundle is constructed in which both ends of a carbon nanotube bundle segment are connected to each other by a van der Waals force. The preparation method of the carbon nanotube rope in the shielding layer 130 mainly comprises the following steps: Step (1) Manufacture of a carbon nanotube bundle array. For a flat and smooth base, a choice of Ρ-type or η-type shi 基底 base is used. In this embodiment, a ρ-type Shi Xi base is used, which is 2 inches in diameter and 350 micrometers thick. A metal catalyst layer having a thickness of several nanometers to several hundred nanometers is formed on the substrate by electron beam evaporation, thermal deposition or sputtering, wherein the metal catalyst may be iron (Fe), cobalt (Co), or nickel ( Ni) or one of its alloys, preferably 10 1329324, is used as a catalyst to deposit a thickness of about 5 nm, and then the substrate on which the catalyst is deposited is annealed in air at an annealing temperature ranging from 300 to 400. C, the time is about 10 hours. After that, the substrate is divided into a plurality of rectangular small pieces, which are placed in a quartz boat and heated in a reaction furnace for a predetermined temperature in the presence of a shielding gas, generally 500 to 700 ° C, preferably 65 (TC. Then pass 30 seem carbon source gas and 30G seem of shielding gas (such as argon) for 5 to 30 minutes to obtain a carbon nanotube bundle array with a height of about 100 microns.

The carbon source gas is a hydrocarbon, and may be acetylene, ethylene bake or the like. Preferably, the block gas is an inert gas or nitrogen gas. In order to obtain a carbon nanotube bundle array of pullable carbon nanotube ropes, the following three conditions must be met in the process of fabricating the nanotube bundle array: (1) The substrate is smooth and smooth; (2) The carbon nanotube bundle array The growth rate is fast; (3) The partial pressure of the carbon source gas is low. The base of the growing carbon nanotube bundle array is smooth and smooth, allowing the base to be located

The carbon nanotubes on the bottom surface grow denser to form an array of carbon nanotube bundles perpendicular to the substrate. The growth rate of the carbon nanotube bundle array is fast and the partial pressure of the carbon source gas is low, which can effectively inhibit the deposition of amorphous carbon on the surface of the carbon nanotubes, thereby reducing the van der Waals force between the carbon nanotube bundles. Since the deposition rate of amorphous carbon is proportional to the partial pressure of the carbon source gas, the cost of the stone source gas can be controlled by adjusting the flow rate ratio of the carbon source gas to the shielding gas. The growth rate of the carbon nanotubes is proportional to the temperature difference between the catalyst and the reactor. The temperature of the catalyst can be controlled by the flow rate of the carbon source gas. 11 1329324 参 参 又 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 In the present embodiment, the minimum temperature difference between the catalyst and the reactor is controlled to 5 ° C, and the partial pressure of the carbon source gas is less than 20%, preferably less than 1%. Step (2) 'Manufacture a carbon nanotube rope. A nano carbon official beam segment including a plurality of carbon nanotube bundles is selected from the array of carbon nanotube bundles, and the carbon nanotube bundle segments are stretched using a stretching tool to form a carbon nanotube string in a stretching direction.

During the stretching process, the carbon nanotube bundle segments are elongated in the tensile direction under the action of the tensile force, while the ends of the 'nano carbon nanotube bundle segments are connected to each other due to the effect of the van der Waals force to form a carbon nanotube string. The amount of force used for stretching depends on the width of the selected carbon nanotube bundle segment. The greater the width, the greater the force required. From the experimental data, it can be concluded that the force of 1 ^ cattle can pull out the carbon nanotubes of (10) wealth. In the present embodiment, it is a carbon of 1 GG micrometer; a carbon nanotube string having a length of a centimeter centimeter and a diameter of 200 micrometers can be pulled out.

The outer sheath 140 is made of an insulating material, and a composite material of nano-bare-polymer material can be selected, wherein the naproxen can be a nano-kaolin or a nano-montmorillonite, and the south molecular material can be a stone compound or a polycrystalline material. Indoleamine, poly-hydrocarbons such as polyethylene, polypropylene, etc., but not limited to this. In this embodiment, a nano-montmorillonite-ethylene-thin composite material is preferred, which has good mechanical properties, resistance to new-burning properties, damage to the purple mechanical machine, and 2 sub-materials, and can also meet the requirements of environmental protection. 2, the electromagnetic 20 disclosed in the second embodiment of the present invention includes a plurality of cores 21 η Γ with 9 士 4 es _ # mosquito line see, 210 (the total number of fresh cores in Figure 2 is not seven), each 12

The outer cover of the 1329324 210 is covered with an insulating dielectric layer 220, a shielding layer 230 covering the outer plurality of cores 210, and an outer sheath 240 covering the outer surface of the shielding layer 230. The gap between the shield layer 230 and the insulating dielectric layer 220 may be filled with an insulating material. The structure, the material of each of the core 210 and the insulating dielectric layer 220, the shielding layer 230 and the outer sheath 240, and the method for preparing the carbon nanotube rope in the shielding layer 230 are the same as those of the first embodiment. The composition of the insulating dielectric layer 12, the shielding layer 130 and the outer sheath 140, and the preparation method of the material and the carbon nanotube string in the shielding layer 13 are basically the same. Referring to FIG. 3, the electromagnetic shielding cable 30 disclosed in the third embodiment of the present invention includes a plurality of cores 3} (a total of five cores are shown), each of the cores 310 is covered with an insulating dielectric layer 320 and a shield. The layer 330, and the outer sheath 34〇 coated on the outer surface of the plurality of cores 310. The function of the shielding layer 33 is to separately shield the respective cores 310, so as not only to prevent external factors from interfering with the electrical signals transmitted inside the cores 310, but also to prevent different electrical signals transmitted in the respective cores 310 from occurring with each other. interference. Wherein, the structure of each of the cable core 310, the insulating medium layer 32, the shielding layer 33 and the outer sheath 34, the material, and the preparation method of the nano tube in the shielding layer 330 and the core of the first embodiment 110. The structure of the insulating dielectric layer 12, the shielding layer 13 and the outer sheath 140, and the preparation method of the material and the carbon nanotube rope in the shielding layer 13 are basically the same. In summary, the present invention has indeed met the requirements of the invention patent, and the patent towel is requested in accordance with the law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to claim the scope of the patent for recording the case. Anyone who is familiar with the skill of the present invention shall be equivalent to the equivalent modification or change in accordance with the spirit of the present invention. 13 1329324 mrsri^------—. Year of the month, the name of the company is changed, and the page is covered in the following patent application scope. Inside. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing an electromagnetic shielding cable according to a first embodiment of the present invention. Fig. 2 is a schematic cross-sectional view showing an electromagnetic shielding cable of a second embodiment of the present invention. Fig. 3 is a schematic cross-sectional view showing an electromagnetic shielding cable according to a third embodiment of the present invention. [Description of main component symbols] 10, 20, 30 110, 210, 310 120, 220, 320 130, 230, 330 140, 240, 340 Electromagnetic screen 敝 _ line view Cable core Insulation dielectric layer Shielding outer sheath 14

Claims (1)

U29324 X. Patent application scope L-type electromagnetic shielding cable, comprising at least a cable core, at least one insulating dielectric layer covering the outer core of the cable core, at least/electromagnetic shielding layer and outer sheath, wherein the electromagnetic shielding layer is composed of multiple The rice is broken by a rope. 2. The electromagnetic shielding cable of claim 1, wherein the 'mother carbon nanotube string comprises a plurality of nanotube carbon nanotube bundle arrays. The carbon nanotube east segment, each of the carbon nanotube bundle segments having substantially equal lengths and each of the carbon nanotube bundle segments is composed of a plurality of mutually parallel carbon nanotube bundles, and the carbon nanotube bundle segments are mutually coupled by van der Waals force connection. 3. The electromagnetic shielding cable according to claim 2, wherein the electromagnetic shielding cable is a coaxial cable, comprising a cable core disposed on the inner and outer coaxial lines, and an outer surface of the covered cable core. - an insulating dielectric layer, a shielding layer covering the outer surface of the two dielectric layers, and an outer surface covering the outer surface of the shielding layer The electromagnetic shielding line includes a plurality of mouths::: the boundary line, wherein the outer insulation _, | number is respectively wrapped on the outer sheath of the outer surface of each of the core shielding layers. 60 screen 敝 layer and covered in 5. The electromagnetic shielding wire double according to the second item of the patent application scope, the electromagnetic shielding cable includes a plurality of -> ''', the middle, the outer dielectric layer, the farewell The cover layer is coated on each of the Μ-ϊβ Ά ^ m knives and is coated on the outer layer of the shield layer and the outer sheath. 6. Outside the shell layer 6. As for the third cable of the patent application scope, wherein the electromagnetic screen described in item 4 or item 5 is not directly or woven into a mesh shape around 15 1329324 Factory face - Year 〖 』 殄 (history) is replacing f outside the dielectric layer. 7. The electromagnetic shielding cable of claim 6, wherein the carbon nanotube string is drawn from a 100 micron array of carbon nanotube bundles having a length of 30 cm and a diameter of 200 microns. 8. The electromagnetic shielding cable according to claim 7, wherein the insulating dielectric layer is made of polyethylene terephthalate, polycarbonate, acrylonitrile butadiene propylene-benzene. Ethylene copolymer or polycarbonate/acrylonitrile-butadiene-styrene copolymer. 16