Copper foil surface coupling agent treatment method, treatment device and copper foil

Abstract

The invention discloses a copper foil surface coupling agent treatment method and device and a copper foil. The treatment method comprises the steps that first coupling agent treatment is conducted, and the first coupling agent is a hydrophilic coupling agent or a hydrophobic coupling agent; treating with a second coupling agent, wherein the second coupling agent is a hydrophilic coupling agent; the treatment device comprises at least one treatment assembly; the treatment assembly comprises a coupling agent treatment mechanism I, a transition mechanism and a coupling agent treatment mechanism II; the coupling agent treatment mechanism I comprises a rotary coating part and a coupling agent storage tank, the coupling agent storage tank is used for storing a first coupling agent, and the rotary coating part is used for coating the first coupling agent in the coupling agent storage tank onto the roughened surface of the copper foil; the second coupling agent processing mechanism comprises a spraying part which is used for spraying a second coupling agent to the roughened face of the copper foil. The surface of the copper foil is treated by combining various surface coupling agents, so that the binding force between the copper foil and the low-polarity high-frequency high-speed resin glass fiber cloth can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal surface treatment, and in particular to a method for treating the surface of a copper foil with a coupling agent, a treatment device and the copper foil. Background Art

[0002] Copper Clad Laminate (CCL) is a plate-like material made by impregnating electronic fiberglass cloth or other reinforcing materials with resin, covering one or both sides with copper foil and hot pressing. Printed circuit boards (PCBs) of various forms and functions are made by selectively processing, etching, drilling and copper plating on copper clad laminates to form different printed circuits to support, connect and insulate electronic components.

[0003] With the advent of the 5G era, the high-frequency and high-speed requirements of communication equipment are becoming increasingly prominent. The high-frequency and high-speed PCBs used in these devices increasingly rely on their substrate materials to overcome the problem of reducing their signal transmission losses. 5G communication high-frequency and high-speed products require copper-clad laminate resins with smaller Dk / Df, and the traditional FR4 epoxy resin system can only meet the Mid Loss requirements. In response to the requirements of Low Loss and above, the resin system of copper-clad laminates gradually approaches low Df PPO / PPE (polyphenylene ether), BMI (bismaleimide), PTFE (polytetrafluoroethylene), PCH (butadiene homopolymer, styrene-butadiene copolymer, styrene-butadiene-divinylbenzene copolymer and other hydrocarbon materials) and other material systems. The use of a mixed system composed of several different resins has comprehensive advantages in terms of cost, processability, reliability, etc., and has become the mainstream choice of some manufacturers. However, since the polarity of the mixed resin system required for high frequency and high speed is lower than that of traditional epoxy resins, the bonding force between the resin glass fiber cloth made of this type of mixed resin and the copper foil is greatly weakened. During processing, manufacturing and application, copper-clad laminates made of this type of material are prone to abnormal phenomena such as delamination, which need to be improved by enhancing the bonding strength between copper foil and resin glass fiber cloth.

[0004] One side of the copper foil of the copper clad laminate is a bright or non-roughened side, which is not combined with the resin glass cloth, and the other side is a roughened or matte side, which is combined with the resin glass cloth. When the copper foil of the copper clad laminate is combined with the resin glass cloth, the bonding force between the copper foil and the resin glass cloth is mainly composed of two forces. On the one hand, it is the mechanical anchoring effect provided by the rough profile of the copper foil surface, and on the other hand, it is the chemical bonding effect between the copper foil and the resin. For copper clad laminates for high-frequency and high-speed PCBs, the roughness of the copper foil is greatly reduced, and the mechanical anchoring effect is reduced. In order to meet the requirements of interfacial bonding, it is necessary to enhance the chemical bonding effect and reduce the dependence on roughness.

[0005] Chemical bonding at the inorganic / organic interface is usually achieved using coupling agents. Different coupling agents have different active groups, which have excellent bonding to specific materials. Therefore, developing a suitable coupling agent surface treatment method to enhance the bonding between copper foil and high-frequency and high-speed copper-clad laminates made of PPO, PTFE, hydrocarbon resin, modified epoxy resin, and mixed resins composed of such resins is crucial to the production and application of high-frequency and high-speed PCBs. Summary of the invention

[0006] The problem to be solved by the present invention is to provide a method for treating the surface of copper foil with a coupling agent, a treatment device and copper foil, by treating the surface of the copper foil with a combination of multiple surface coupling agents, the bonding strength between the copper foil and the low-polarity, high-frequency and high-speed resin glass fiber cloth can be effectively improved.

[0007] The present invention provides a technical solution to solve the above problems: a method for treating the surface of copper foil with a coupling agent, the method comprising:

[0008] Treatment with a first coupling agent, wherein the first coupling agent is a hydrophilic coupling agent or a hydrophobic coupling agent, which can wet the surface of the copper foil and is particularly suitable for coupling reaction with a low-polarity resin;

[0009] The second coupling agent is treated, wherein the second coupling agent is a hydrophilic coupling agent, has a high affinity with the surface of the copper foil, and is particularly suitable for coupling reaction with a high polarity resin.

[0010] Preferably, the volume concentration of the first coupling agent is 0.05%-4%, and the first coupling agent is one or two of vinyltrimethoxysilane, vinyltriethoxysilane, vinyl-3-(2-methoxyethoxy)silane, and oligovinylsilane.

[0011] Preferably, the volume solubility of the second coupling agent is 0.2%-10%, and the second coupling agent is one of 3-glycidyloxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

[0012] Preferably, the treatment method further comprises treatment with a third coupling agent, wherein the third coupling agent is an aminosilane coupling agent; the volume solubility of the third coupling agent is 0.1%-2%, and the third coupling agent is one or a combination of two of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, bis-(γ-triethoxysilylpropyl)amine, and γ-aminopropyltriethoxysilane.

[0013] Preferably, the treatment method further comprises treatment with a fourth coupling agent, wherein the fourth coupling agent is an aqueous solution of an epoxysilane coupling agent; the volume solubility of the fourth coupling agent is 0.2%-10%, and the fourth coupling agent is one of 3-glycidyloxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

[0014] The present invention also discloses a copper foil surface coupling agent treatment device, the device comprising: at least one treatment component;

[0015] The processing assembly includes a coupling agent processing mechanism 1, a transition mechanism and a coupling agent processing mechanism 2, and the copper foil passes through the coupling agent processing mechanism 1, the transition mechanism and the coupling agent processing mechanism 2 in sequence;

[0016] The coupling agent treatment mechanism 1 comprises a rotating coating component and a coupling agent storage tank, wherein the coupling agent storage tank is used to store a first coupling agent, and the rotating coating component is used to coat the first coupling agent in the coupling agent storage tank onto the roughened surface of the copper foil;

[0017] The second coupling agent treatment mechanism includes a spraying component, and the spraying component is used to spray the second coupling agent onto the roughened surface of the copper foil;

[0018] The transition mechanism includes a bright-surface transition roller, a deionized water spray rod and a rough-surface transition roller 2, the roller surface of the bright-surface transition roller contacts the bright surface of the copper foil, the deionized water spray rod is arranged above the copper foil 2 between the bright-surface transition roller and the rough-surface transition roller 1 4, the deionized water spray rod is used to spray deionized water, and the rough-surface transition roller 2 is arranged obliquely above the bright-surface transition roller and the roller surface contacts the roughened surface of the copper foil.

[0019] Preferably, the rotating coating component includes a rough surface transition roller and a pressing roller, wherein a portion of the rough surface transition roller is located in a coupling agent storage tank, and the rough surface transition roller carries a coupling agent solution on its roller surface and contacts the roughened surface of the copper foil during rotation, and the pressing roller is arranged above the rough surface transition roller, and the pressing roller is used to evenly and fully infiltrate the coupling agent solution carried by the rough surface transition roller into the roughened copper tooth gaps of the entire width of the copper foil.

[0020] Preferably, the spray component includes a coupling agent spray rod and a coupling agent collecting tank, the coupling agent spray rod is arranged below the roughened surface of the copper foil, the coupling agent collecting tank is located directly below the bright surface transition roller, and the coupling agent collecting tank is used to collect the coupling agent solution flowing down the surface of the copper foil.

[0021] Preferably, the processing component also includes hot air knife group one and hot air knife group two, which are respectively arranged on both sides of the bright surface transition roller and located at the lower end of the copper foil, and the hot air knife group one and hot air knife group two are used to blow dry the coupling agent on the copper foil passing through the hot air knife group one and hot air knife group two.

[0022] The present invention also discloses a copper foil, which is prepared by treating the copper foil surface with a coupling agent according to any one of the above methods.

[0023] Compared with the prior art, the present invention has the advantages that: the present invention can effectively improve the bonding force between the copper foil and the low-polarity, high-frequency, and high-speed resin glass fiber cloth by treating the copper foil surface with a combination of multiple surface coupling agents. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 Schematic diagram of the copper foil surface coupling agent treatment device of the present invention Figure 1 ;

[0026] Figure 2 Schematic diagram of the copper foil surface coupling agent treatment device of the present invention Figure 2 .

[0027] The attached drawings are marked with: 1. Rough-surface transition roller 2, 2. Copper foil, 3. Pressing roller, 4. Rough-surface transition roller 1, 5. Coupling agent storage tank, 6. Liquid inlet and liquid return pipes, 7. Hot air knife group 1, 8. Deionized water spray rod, 9. Bright-surface transition roller, 10. Coupling agent liquid collecting tank, 11. Liquid return pipe, 12. Coupling agent spray rod, 13. Hot air knife group 2. DETAILED DESCRIPTION

[0028] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0029] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0033] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms.

[0034] Example 1

[0035] The copper foil in this embodiment is an RTF1 grade electrolytic copper foil with a nominal thickness of 18 μm (roughness Rz is 3.0-3.5 μm).

[0036] The resin system of the copper clad laminate is epoxy resin or PPO, and the copper foil thereof is treated by the following method, which includes:

[0037] The first coupling agent treatment adopts a vinyl silane coupling agent aqueous solution; the volume concentration of the first coupling agent is 0.05%-4%, and the first coupling agent treatment is one or two of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl-3-2-methoxyethoxy silane, and low-polyvinyl silane.

[0038] The second coupling agent is treated, wherein the second coupling agent adopts an epoxysilane coupling agent aqueous solution; the volume solubility of the second coupling agent is 0.2%-10%, and the second coupling agent is one of 3-glycidyloxypropyltrimethoxysilane, 2-3,4-epoxycyclohexylethyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

[0039] Example 2

[0040] The copper foil in this embodiment is an RTF1 grade electrolytic copper foil with a nominal thickness of 18 μm (roughness Rz is 3.0-3.5 μm).

[0041] The copper foil of the copper clad laminate whose resin system is (epoxy resin, PPO mixed system) or (epoxy resin, PPO resin, BMI resin mixed system) is treated by the following method, which includes:

[0042] The first coupling agent treatment adopts a vinyl silane coupling agent aqueous solution; the volume concentration of the first coupling agent is 0.05%-4%, and the first coupling agent treatment is one or two of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl-3-2-methoxyethoxy silane, and low-polyvinyl silane.

[0043] The second coupling agent is treated, wherein the second coupling agent adopts an epoxysilane coupling agent aqueous solution; the volume solubility of the second coupling agent is 0.2%-10%, and the second coupling agent is one of 3-glycidyloxypropyltrimethoxysilane, 2-3,4-epoxycyclohexylethyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

[0044] The third coupling agent is treated, and the third coupling agent adopts an aminosilane coupling agent; the volume solubility of the third coupling agent is 0.1%-2%, and the third coupling agent is one or a combination of two of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, bis-(γ-triethoxysilylpropyl)amine, and γ-aminopropyltriethoxysilane.

[0045] The fourth coupling agent is treated with an epoxysilane coupling agent aqueous solution; the volume solubility of the fourth coupling agent is 0.2%-10%, and the fourth coupling agent is one of 3-glycidyloxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

[0046] Table 1

[0047]

[0048] Table 2

[0049]

[0050] It can be seen from Tables 1 and 2 that the copper clad laminates made by compounding RTF1 grade electrolytic copper foil with a nominal thickness of 18 μm with four different resin systems have significantly stronger peel strength than the treatment methods in Comparative Examples 1-3.

[0051] Example 3

[0052] This embodiment discloses a copper foil surface coupling agent treatment device, the device comprising: at least one treatment component;

[0053] The processing assembly includes a coupling agent processing mechanism 1, a transition mechanism and a coupling agent processing mechanism 2, and the copper foil 2 passes through the coupling agent processing mechanism 1, the transition mechanism and the coupling agent processing mechanism 2 in sequence;

[0054] The coupling agent treatment mechanism 1 includes a rotating coating component and a coupling agent storage tank 5, wherein the coupling agent storage tank 5 is used to store the first coupling agent, and the rotating coating component is used to coat the first coupling agent in the coupling agent storage tank 5 onto the roughened surface of the copper foil 2, one end of the coupling agent storage tank is connected to the liquid inlet pipe, and the other end is connected to the liquid discharge pipe, and the first coupling agent solution in the coupling agent storage tank is continuously flowing and updated;

[0055] The second coupling agent treatment mechanism includes a spraying component, and the spraying component is used to spray the second coupling agent onto the roughened surface of the copper foil 2;

[0056] The transition mechanism includes a bright-surface transition roller 9, a deionized water spray rod 8 and a rough-surface transition roller 1. The roller surface of the bright-surface transition roller 9 contacts the bright surface of the copper foil 2. The deionized water spray rod 8 is arranged above the copper foil 2 between the bright-surface transition roller 9 and the rough-surface transition roller 1. The deionized water spray rod 8 is used to spray deionized water to form a water film to protect the copper foil 2 from contamination and lubricate the bright-surface transition roller 9. The rough-surface transition roller 1 is arranged obliquely above the bright-surface transition roller 9 and the roller surface contacts the roughened surface of the copper foil 2.

[0057] In this embodiment, the rotating coating component includes a rough surface transition roller 4 and a pressing roller 3. A portion of the rough surface transition roller 4 is located in a coupling agent storage tank 5. During the rotation of the rough surface transition roller 4, the roller surface carries a coupling agent solution and contacts the roughened surface of the copper foil 2. The pressing roller 3 is arranged above the rough surface transition roller 4. The pressing roller 3 is used to evenly and fully infiltrate the coupling agent solution carried by the rough surface transition roller 4 into the roughened copper tooth gaps of the entire width of the copper foil 2.

[0058] In this embodiment, further, the spray component includes a coupling agent spray rod 12 and a coupling agent collecting tank 10, the coupling agent spray rod 12 is arranged below the roughened surface of the copper foil 2, the coupling agent collecting tank 10 is located directly below the bright surface transition roller 9, and the coupling agent collecting tank 10 is used to collect the coupling agent solution flowing down the surface of the copper foil 2.

[0059] The processing assembly further includes a hot air knife group 1 7 and a hot air knife group 2 13, which are respectively arranged on both sides of the bright surface transition roller 9 and located at the lower end of the copper foil 2, and are used to dry the coupling agent on the copper foil 2 passing through the hot air knife group 1 7 and the hot air knife group 2 13. It should be noted that the hot air knife group 1 7 includes 1 group, 2 groups or 3 groups of air knives, and the hot air knife group 2 13 includes 2 groups or 3 groups of air knives, so that the second coupling agent can be dried, and the coupling agent solution flowing down the foil surface on the latter set of coupling agent processing devices can also be dried.

[0060] Due to the roller surface rotating coating method, the amount of coupling agent solution accumulated on the surface of the copper foil before the pressing roller is small, and the amount of coupling agent solution flowing down the foil surface is also small, which can be quickly dried by the hot air knife of the previous set of coupling agent treatment device, thereby not contaminating the second coupling agent solution in the previous set of coupling agent treatment device.

[0061] After being squeezed by the pressing roller, the amount of the first coupling agent solution on the roughened surface of the copper foil is reduced, and it can be easily blown dry after passing through the hot air of the hot air knife group, thereby not affecting the second coupling agent treatment.

[0062] The second coupling agent treatment is a spray treatment, and the coating is dried after being blown by hot air from a hot air knife group.

[0063] In the above scheme, it should be noted that the coupling agent solution in the coupling agent storage tank 5 is continuously introduced and discharged through the liquid inlet and liquid return pipes 6 to keep the volume and concentration of the coupling agent solution in the coupling agent storage tank 5 stable; the coupling agent solution sprayed by the coupling agent spray rod 12 flows down along the surface of the copper foil and enters the coupling agent collecting tank 10, and is recycled through the liquid return pipe 11 on the coupling agent collecting tank 10. Among them, the length of the coupling agent storage tank 5 is longer than the rough surface transition roller 4, and both ends are located outside the rough surface transition roller 4. This structure can make the surface of the rough surface transition roller 4 adhere to a sufficient amount of coupling agent solution, and under the extrusion of the pressing roller 3, the coupling agent is evenly coated on the roughened copper tooth gap of the entire width of the copper foil 2; the length of the coupling agent collecting tank 10 is shorter than the bright surface transition roller 9, and both ends are located inside the bright surface transition roller 9. This structure reduces the deionized water on the bright surface of the copper foil from entering the coupling agent collecting tank 10, and avoids the dilution and reduction of the coupling agent solution.

[0064] It should be noted that there may be multiple groups of processing components in the present device. When used in Example 1, one group is used. Figure 1 As shown, in Example 2, two groups are used (the coupling agent storage tank in the second group contains the third coupling agent, and the spraying component in the second group is used to spray the fourth coupling agent), as shown in FIG. Figure 2 As shown, the first and second, third and fourth, to Nth and N+th coupling agent treatments can be implemented to obtain better effects.

[0065] Example 4

[0066] This embodiment discloses a copper foil, which is prepared by treating the surface of the copper foil with a coupling agent as described in Embodiment 1 or 2.

[0067] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A method for treating the surface of copper foil with a coupling agent, characterized in that: The processing method comprises: Treatment with a first coupling agent, wherein the first coupling agent is a hydrophilic coupling agent or a hydrophobic coupling agent; The second coupling agent is treated, wherein the second coupling agent is a hydrophilic coupling agent.

2. A method for treating the surface of copper foil with a coupling agent according to claim 1, characterized in that: The volume concentration of the first coupling agent is 0.05%-4%, and the first coupling agent is one or two of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl-3-(2-methoxyethoxy) silane, and low-polyvinyl silane.

3. A method for treating the surface of copper foil with a coupling agent according to claim 1, characterized in that: The volume solubility of the second coupling agent is 0.2%-10%, and the second coupling agent is one of 3-glycidyloxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and gamma-methacryloxypropyltrimethoxysilane.

4. A method for treating the surface of copper foil with a coupling agent according to claim 1, characterized in that: The treatment method also includes treatment with a third coupling agent, wherein the third coupling agent is an aminosilane coupling agent; the volume solubility of the third coupling agent is 0.1%-2%, and the third coupling agent is one or a combination of two of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, bis-(γ-triethoxysilylpropyl)amine, and γ-aminopropyltriethoxysilane.

5. The method for treating the surface of copper foil with a coupling agent according to claim 1, characterized in that: The treatment method also includes a fourth coupling agent treatment, wherein the fourth coupling agent is an epoxysilane coupling agent aqueous solution; the volume solubility of the fourth coupling agent is 0.2%-10%, and the fourth coupling agent is one of 3-glycidyloxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

6. A copper foil surface coupling agent treatment device, characterized in that: The apparatus comprises: at least one processing component; The processing assembly comprises a first coupling agent processing mechanism, a transition mechanism and a second coupling agent processing mechanism, and the copper foil (2) passes through the first coupling agent processing mechanism, the transition mechanism and the second coupling agent processing mechanism in sequence; The coupling agent treatment mechanism 1 comprises a rotating coating component and a coupling agent storage tank (5), wherein the coupling agent storage tank (5) is used to store a first coupling agent, and the rotating coating component is used to coat the first coupling agent in the coupling agent storage tank (5) onto the roughened surface of the copper foil (2); The second coupling agent treatment mechanism comprises a spraying component, and the spraying component is used to spray the second coupling agent onto the roughened surface of the copper foil (2); The transition mechanism comprises a bright-surface transition roller (9), a deionized water spray rod (8) and a rough-surface transition roller 2 (1); the roller surface of the bright-surface transition roller (9) contacts the bright surface of the copper foil (2); the deionized water spray rod (8) is arranged above the copper foil (2) between the bright-surface transition roller (9) and the rough-surface transition roller 1 (4); the deionized water spray rod (8) is used to spray deionized water; the rough-surface transition roller 2 (1) is arranged obliquely above the bright-surface transition roller (9) and the roller surface contacts the roughened surface of the copper foil (2).

7. A copper foil surface coupling agent treatment device according to claim 6, characterized in that: The rotating coating component comprises a rough surface transition roller (4) and a pressing roller (3), wherein a portion of the rough surface transition roller (4) is located in a coupling agent storage tank (5), and the liquid inlet and return pipes (6) pass the coupling agent solution into and out of the coupling agent storage tank (5) to maintain the volume and concentration of the coupling agent solution in the coupling agent storage tank (5) stable. During the rotation of the rough surface transition roller (4), the roller surface carries the coupling agent solution and contacts the roughened surface of the copper foil (2), and the pressing roller (3) is arranged above the rough surface transition roller (4), and the pressing roller (3) is used to uniformly and fully infiltrate the coupling agent solution carried by the rough surface transition roller (4) into the roughened copper tooth gaps of the entire width of the copper foil (2).

8. A copper foil surface coupling agent treatment device according to claim 6 or 7, characterized in that: The spraying component comprises a coupling agent spraying rod (12) and a coupling agent collecting tank (10), wherein the coupling agent spraying rod (12) is arranged below the roughened surface of the copper foil (2), and the coupling agent collecting tank (10) is located directly below the bright surface transition roller (9), and the coupling agent collecting tank (10) is used to collect the coupling agent solution flowing down the surface of the copper foil (2).

9. A copper foil surface coupling agent treatment device according to claim 6, characterized in that: The processing assembly also includes a hot air knife group 1 (7) and a hot air knife group 2 (13), which are respectively arranged on both sides of the bright surface transition roller (9) and located at the lower end of the copper foil (2), and the hot air knife group 1 (7) and the hot air knife group 2 (13) are used to blow dry the coupling agent on the copper foil (2) passing through the hot air knife group 1 (7) and the hot air knife group 2 (13).

10. A copper foil, characterized in that: The copper foil is prepared by treating the copper foil surface with a coupling agent according to any one of claims 1 to 5.

Images