Composite metal foil and cable material

Abstract

The present application relates to the technical field of cable, in particular to a composite metal foil and cable material, the composite metal foil comprises a base material layer and a shielding layer which are stacked, the material of the base material layer has an intrinsic viscosity (eta) of 0.53 dl / g to 0.68 dl / g; the composite metal foil containing the base material layer material with the specific intrinsic viscosity can have good elongation and soldering tin efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable, in particular to a composite metal foil and cable material. BACKGROUND

[0002] The shielding layer of the wire and cable mainly reduces the influence of external electromagnetic interference on the signal and improves the anti-interference ability of the cable.

[0003] Compared with the aluminum foil, the copper foil has better shielding effect and service life. According to the different structures of the copper foil, the copper foil shielding layer can be divided into the following types: 1, the copper braid shielding layer is woven by fine copper wires and has good flexibility and tensile resistance. The copper braid shielding layer is wrapped outside the insulating layer and can be repeatedly bent; 2, the copper mesh braid shielding layer. The dense copper mesh braid structure can shield high-frequency signals and is commonly used in high-performance radio frequency cables and high-speed data transmission cables; 3, the aluminum-copper double-layer shielding layer combines the double-layer shielding structure of the aluminum foil and the copper mesh braid. The aluminum-copper double-layer shielding layer can effectively shield low-frequency and high-frequency interference and achieve the balance between strength and flexibility; 4, the composite copper foil shielding layer. The structure of the composite copper foil shielding layer includes a copper layer and a composite film material. The composite copper foil shielding layer can provide excellent shielding performance in the visible light waveband, the near-infrared waveband and the microwave band. Meanwhile, the composite copper foil shielding layer can reduce the amount of copper, so that the overall weight is lighter and the composite copper foil shielding layer has a wider application scenario.

[0004] However, the existing composite copper foil has the following problems when used for cable shielding: the composite copper foil is wrapped around the cable in a winding manner. When the cable joint is manufactured, the end and the cable are welded. At this time, the composite film material needs to be melted to contact the copper to form the welding. The composite film material in the existing composite copper foil shielding layer is commonly made of PET material. If a thinner material is used, the melting effect can be achieved. However, the elongation rate is low, and the composite copper foil is easy to break when wound around the cable, which leads to the failure of the shielding effect. If a thicker PET is used, the elongation rate is large and the composite copper foil will not break. However, when welding, the tin cannot be combined with the copper, and the tin plating effect is poor. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the problem that the existing composite copper foil cannot simultaneously consider the shielding effect and the quality of the product when used for cable shielding, so as to provide a composite metal foil and a cable material.

[0006] In a first aspect, the present application protects a composite metal foil, wherein the composite metal foil comprises a base material layer and a shielding layer which are arranged in layers. The material of the base material layer has an intrinsic viscosity η of 0.53 dl / g to 0.68 dl / g.

[0007] In the present application, the intrinsic viscosity is detected in a conventional manner.

[0008] According to the present application, the material of the base material layer has a crystallinity of 0% to 30%.

[0009] In the present application, the crystallinity of the material of the substrate layer can be detected by differential scanning calorimetry, X-ray diffraction, density method, infrared spectroscopy, nuclear magnetic resonance method, optical microscope and polarizing microscope method, etc. In the present application, X-ray diffraction method is used for detection.

[0010] According to the present application, the melting area of the substrate layer is greater than 30% after the material of the substrate layer is immersed in tin at 250-300℃ for 2-5s.

[0011] In the present application, visual software processing statistical method is used to detect the melting area of the material of the substrate layer after immersion in tin.

[0012] According to the present application, the melting area of the substrate layer is greater than 70% after the material of the substrate layer is immersed in tin at 270℃ for 3s.

[0013] According to the present application, the ratio of the thickness of the substrate layer to the thickness of the shielding layer is 2-20:1.

[0014] According to the present application, the ratio of the elongation of the composite metal foil to the elongation of the substrate layer is 0.05-0.7:1.

[0015] In the present application, tensile testing machine is used to detect the elongation, and the specific calculation formula of the elongation is: (sample length at break - sample initial length) / sample initial length x 100%.

[0016] According to the present application, the thickness of the substrate layer is 4-8μm.

[0017] In the present application, the thickness of each layer is detected by electron microscope observation and software processing method.

[0018] According to the present application, the thickness of the shielding layer is 0.5-4μm.

[0019] In the present application, the material of the substrate layer comprises at least one of PET, PP, PI, PVC, PE, EVA and PC; the material of the shielding layer comprises at least one of copper, aluminum, gold, silver, iron, nickel, chromium and zinc.

[0020] In the present application, PET can be commercially available or synthesized, and the weight average molecular weight of PET is 30000-70000g / mol.

[0021] According to the present application, the composite metal foil further comprises an adjusting layer, which is arranged between the shielding layer and the substrate layer.

[0022] According to the present application, the material of the adjusting layer comprises a metal seed layer or a polymer glue.

[0023] According to the application, the thickness of the adjusting layer is 2nm-2μm.

[0024] According to the application, the adjusting layer is a metal seed layer, wherein the material of the metal seed layer is a conductive metal, and the base material layer is made conductive by forming the seed layer on the base material layer of non-metal material, so that the shielding layer can be formed on the seed layer by electroplating.

[0025] Alternatively, the adjusting layer is a high polymer glue, and the material of the glue layer comprises at least one of polyurethane, water-soluble epoxy resin, acrylic acid, polyamide and phenolic resin, and the adjusting layer serves to improve the bonding force between the base material layer and the shielding layer and avoid delamination during use; when the high polymer glue is selected, the shielding layer is generally formed by pressing.

[0026] In the application, the preparation method of the composite metal foil is a conventional preparation method in the art, and at least one of pressing, electroplating, chemical plating and vacuum sputtering is used to prepare the shielding layer on the base material layer; typically and non-limitingly, a copper metal seed layer with a thickness of 5nm-500nm is vacuum sputtered on the surface of the PET layer, and then a copper layer with a thickness of 0.5μm-4μm is electroplated on the copper metal seed layer.

[0027] The second aspect of the application protects a cable material, wherein the cable material comprises a cable body and the composite metal foil.

[0028] The technical scheme of the application has the following advantages:

[0029] 1. The application provides a composite metal foil, wherein the composite metal foil comprises a base material layer and a shielding layer arranged in layers, and the material of the base material layer has an intrinsic viscosity η of 0.53dl / g-0.68dl / g; the composite metal foil comprising the base material layer with the specific intrinsic viscosity is used for cable shielding, has good elongation and tin plating efficiency during welding, ensures the welding stability of the joint, does not delaminate or break, and improves the working reliability of the cable.

[0030] 2. The specific crystallinity of the base material layer material in the application can improve the toughness of the base material layer, make the base material layer have better solubility, and reduce the internal stress of the base material layer, which is beneficial to reducing the probability of breakage of the composite metal foil during use, and further improves the processing efficiency of the cable shielding material and the working reliability of the cable.

[0031] 3. The specific thickness ratio of the base material layer to the shielding layer can ensure the shielding effect while further reducing the overall amount of the metal shielding layer, improve the structural stability, and reduce the overall weight and production cost.

[0032] 4、The ratio of the elongation of the composite metal foil to the elongation of the base material layer can further improve the overall physical properties of the composite metal foil, avoiding the breakage of the cable shielding material during winding.

[0033] 5、The specific thickness of the base material layer can further reduce the amount of shielding layer material, improve the overall toughness of the material, avoid breakage, and reduce costs.

[0034] 6、The specific thickness of the shielding layer can further ensure the performance of shielding effect and elongation, and meet the use scenarios of cable shielding.

[0035] 7、The specific thickness of the adjusting layer can further improve the bonding force, balance the use requirements of shielding effect and elongation, and meet the use scenarios of cable shielding. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0037] Figure 1 is a structural schematic diagram of the composite metal foil of Example 1;

[0038] Figure legend: 1-shielding layer; 2-adjusting layer; 3-base material layer. DETAILED DESCRIPTION

[0039] The following examples are provided to better further understand the present application and are not limited to the best mode of the present application, and do not constitute a limitation on the content and scope of protection of the present application. Any person under the inspiration of the present application or the combination of the present application with other prior art features can obtain any product same or similar to the present application, which falls within the protection scope of the present application.

[0040] If the specific experimental steps or conditions are not specified in the examples, the operation or conditions can be carried out according to the conventional experimental steps described in the literature in the art. If the reagent or instrument used is not specified by the manufacturer, it is a conventional reagent product that can be obtained by market purchase.

[0041] X-ray diffraction method is used to detect the crystallinity of the base material layer material;

[0042] The melting area of the substrate layer after the material is immersed in tin is detected by a visual software processing statistical method. Specifically, the image of the outer side of the substrate layer after immersion in tin is obtained by a photographing sampling method, the obtained image is analyzed by an image processing software or program, and the proportion of the area of the tin immersion area (silver metal area) is calculated as the melting area of the substrate layer.

[0043] The thickness of each layer is detected by electron microscope observation and software processing.

[0044] The elongation at break is tested by a tensile testing machine according to a tensile testing method. The elongation at break is calculated according to the following formula: (total length at break - initial length) / initial length * 100%.

[0045] The weight average molecular weight of the PET is 50000 g / mol.

[0046] Embodiment 1

[0047] The embodiment provides a composite metal foil, which is specifically as follows.

[0048] The seed adjusting layer of copper material is formed on one side of the substrate layer of PET material by a magnetron sputtering method, and then the copper layer shielding layer is formed by an electroplating thickening method to obtain the composite metal foil.

[0049] The intrinsic viscosity η of the substrate layer material of PET material is 0.61 dl / g, the crystallinity is 30%, the thickness of the substrate layer is 6 μm, the thickness of the adjusting layer is 5 nm, and the thickness of the shielding layer is 1.1 μm. The ratio of the elongation of the composite metal foil to the elongation of the substrate layer is 0.37:1.

[0050] The composite metal foil is subjected to tin immersion experiment under the condition of 270°C and 3s. The melting area of the substrate layer is 62%. The elongation of the composite metal foil is 32.7%. The structural schematic diagram of embodiment 1 is shown in Figure 1 It can be seen that the substrate layer, the adjusting layer and the shielding layer are arranged in layers.

[0051] Embodiment 2

[0052] The embodiment provides a composite metal foil, which is specifically as follows.

[0053] The seed adjusting layer of copper material is formed on one side of the substrate layer of PET material by a magnetron sputtering method, and then the copper layer shielding layer is formed by an electroplating thickening method to obtain the composite metal foil.

[0054] The intrinsic viscosity η of the substrate layer material of PET material is 0.68 dl / g, the crystallinity is 24%, the thickness of the substrate layer is 8 μm, the thickness of the adjusting layer is 200 nm, and the thickness of the shielding layer is 1.5 μm. The ratio of the elongation of the composite metal foil to the elongation of the substrate layer is 0.51:1.

[0055] Under the condition of 270℃, 3s, tin immersion experiment was conducted on the composite metal foil, the melting area of the substrate layer was 85%, and the elongation of the whole composite metal foil was 34.4%.

[0056] Example 3

[0057] The example provides a composite metal foil, specifically as follows:

[0058] The example adopts the same stack structure as example 1, wherein, different from example 1, the crystallinity of the PET substrate layer is 0, the ratio of the elongation of the whole composite metal foil to the elongation of the substrate layer is 0.24:1, and the elongation is 59.6%;

[0059] Under the condition of 270℃, 3s, tin immersion experiment was conducted on the composite metal foil, the melting area of the substrate layer was 91%, and the elongation of the whole composite metal foil was 35.9%.

[0060] Example 4

[0061] The example provides a composite metal foil, specifically as follows:

[0062] The example adopts the same stack structure as example 1, wherein, different from example 1, the thickness of the substrate layer is 6.5μm, the thickness of the adjusting layer is 5nm, and the thickness of the shielding layer is 0.8μm;

[0063] Under the condition of 270℃, 3s, tin immersion experiment was conducted on the composite metal foil, the melting area of the substrate layer was 73%, and the elongation of the whole composite metal foil was 28.7%.

[0064] Example 5

[0065] The example provides a composite metal foil, specifically as follows:

[0066] The example adopts the same stack structure as example 1, wherein, different from example 1, the thickness of the substrate layer is 6.5μm, the thickness of the adjusting layer is 5nm, and the thickness of the shielding layer is 0.8μm;

[0067] Under the condition of 270℃, 3s, tin immersion experiment was conducted on the composite metal foil, the melting area of the substrate layer was 73%, and the elongation of the whole composite metal foil was 28.7%.

[0068] Example 6

[0069] The example provides a composite metal foil, specifically as follows:

[0070] The embodiment adopts the same stack structure as that of the embodiment 1, wherein, different from the embodiment 1, the thickness of the shielding layer is 2 μm.

[0071] The immersion tin experiment is conducted on the composite metal foil under the condition of 270 ℃ and 3 s, the melting area of the substrate layer is 83%, and the elongation of the whole composite metal foil is 19.8%.

[0072] Comparative example 1

[0073] The comparative example provides a composite metal foil, and the details are as follows:

[0074] The same stack structure as that of the embodiment 1 is adopted, wherein, different from the embodiment 1, the intrinsic viscosity η of the substrate layer material of the PET material is 0.51 dl / g, and the crystallinity is 35%.

[0075] The immersion tin experiment is conducted on the composite metal foil under the condition of 270 ℃ and 3 s, the melting area of the substrate layer is 48.6%, and the elongation of the whole composite metal foil is 23.1%. Although the comparative example has a higher elongation, the melting area of the substrate layer is too low to meet the welding requirement of the cable joint.

[0076] Comparative example 2

[0077] The comparative example provides a composite metal foil, and the details are as follows:

[0078] The same stack structure as that of the embodiment 1 is adopted, wherein, different from the embodiment 1, the intrinsic viscosity η of the substrate layer material of the PET material is 0.70 dl / g.

[0079] The immersion tin experiment is conducted on the composite metal foil under the condition of 270 ℃ and 3 s, the melting area of the substrate layer is 27.9%, and the elongation of the whole composite metal foil is 18.5%.

[0080] In the present application, it can be seen from the specific data that the embodiment and the comparative example have excellent elongation and tin melting area, which can ensure the welding stability of the joint, and the delamination and rupture do not occur, thereby improving the working reliability of the cable.

[0081] It can be seen from the embodiment 1 and the comparative examples 1 and 2 that the substrate layer material with a specific intrinsic viscosity can further improve the tin efficiency and elongation.

[0082] Obviously, the above embodiment is only an example for clearly illustrating, and does not limit the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A composite metal foil, characterized by, The composite metal foil comprises a base material layer and a shielding layer arranged in a stack, the material of the base material layer has an intrinsic viscosity η of 0.53 dl / g to 0.68 dl / g; The material of the base material layer is PET; The material of the base material layer has a crystallinity of 0% to 30%; The ratio of the thickness of the base material layer to the thickness of the shielding layer is 2 to 20:1; The thickness of the base material layer is 4 μm to 8 μm; The thickness of the shielding layer is 0.5 μm to 4 μm.

2. The composite metal foil according to claim 1, wherein The material of the base material layer has a melting area of the base material layer of greater than 70% after immersion in tin at 270°C for 3 s.

3. The composite metal foil according to claim 1, wherein The ratio of the elongation of the composite metal foil to the elongation of the base material layer is 0.05 to 0.7:

1.

4. The composite metal foil according to claim 1, wherein The composite metal foil further comprises an adjustment layer arranged between the shielding layer and the base material layer.

5. The composite metal foil according to claim 4, wherein The thickness of the adjustment layer is 2 nm to 2 μm.

6. A cable material, characterized by The cable material comprises a cable body and the composite metal foil according to any one of claims 1 to 5.

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