Conductive fiber surface selective metal electrodeposition device
By designing a selective metal electrodeposition device for conductive fiber surfaces, and employing a cathode roller assembly and an adjustable electrodeposition reaction tank, selective metal deposition on carbon fiber surfaces was achieved. This solved the problems of high cost, severe pollution, and low efficiency in existing technologies, and improved fiber performance and the wave absorption performance of woven fabrics.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-01
AI Technical Summary
Existing carbon fiber surface metallization technologies suffer from high costs, severe pollution, difficulty in achieving precise and controllable selective metallization, and low efficiency and high equipment costs of traditional methods.
A selective metal electrodeposition device for conductive fiber surfaces is designed, employing a cathode roller assembly and an adjustable electrodeposition reaction tank. By alternating the conductive and insulating regions of the cathode rollers, selective metal deposition on the conductive fiber surface is achieved.
Selective metallization of the conductive fiber surface was achieved, which improved the conductivity and shielding properties of the fiber, reduced the manufacturing cost, and improved the wave absorption performance of the woven fabric.
Smart Images
Figure CN224186296U_ABST
Abstract
Description
Technical Field
[0001] This utility model specifically relates to a selective metal electrodeposition device for conductive fiber surfaces, belonging to the field of fiber metallization technology. Background Technology
[0002] Carbon fiber is a high-performance fiber material made from precursors such as polyvinyl acrylonitrile and pitch through high-temperature carbonization. It possesses properties such as high strength, high modulus, corrosion resistance, and fatigue resistance. However, carbon fiber itself is brittle and has poor impact resistance, so its surface is usually metallized to improve its properties.
[0003] Carbon fiber surface metallization involves depositing a layer of metal or alloy onto the fiber surface. Metal coatings can enhance carbon fiber strength, improve its electrical and thermal conductivity, and strengthen its oxidation and corrosion resistance. A coating metal that wets well with the carbon fiber can also serve as a transition layer between the carbon fiber and other metal matrices, improving interfacial adhesion.
[0004] Methods for metallizing carbon fiber surfaces include electroless plating, electroplating, and chemical vapor deposition. Electroless plating requires precious metal catalysts, resulting in high costs, slow plating speeds, and severe pollution. Traditional electroplating is low-cost and low-pollution, but it is difficult to achieve precise and controllable selective metallization of long carbon fiber surfaces. Chemical vapor deposition is commonly used in semiconductors, coatings, and other fields, but it is energy-intensive at high temperatures, has low production efficiency, high equipment costs, and is difficult to operate. Utility Model Content
[0005] The main objective of this invention is to provide a selective metal electrodeposition device for conductive fiber surfaces. By designing the electrode functions and controlling the reactor structure, metal can be selectively and precisely deposited on the surface of continuous carbon fibers, giving it excellent properties of conductivity, shielding, and strength, thus meeting the application requirements of different scenarios and overcoming the shortcomings of the prior art.
[0006] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes:
[0007] This utility model provides a selective metal electrodeposition device for conductive fiber surfaces, which includes an electrodeposition reaction module, the electrodeposition reaction module comprising:
[0008] A reaction vessel having an electrodeposition reaction tank for containing an electrolytic solution and providing space for an electrodeposition reaction to occur, the length of the electrodeposition reaction tank in a first direction being adjustable;
[0009] A cathode roller assembly, comprising two identical cathode rollers, the two cathode rollers being respectively disposed on both sides of the electrodeposition reaction tank along the first direction, the cathode rollers being rotatable about their own axis, and the roller surface of the cathode rollers having m conductive areas and n insulating areas disposed along their own circumference, where m≥1 and n≥1;
[0010] The anode is disposed within the electrodeposition reaction tank;
[0011] A power source, wherein the positive terminal of the power source is electrically connected to the anode and the negative terminal is electrically connected to all conductive areas of the two cathode rollers;
[0012] When the conductive fiber immersed in the electrolyte solution comes into contact with the conductive areas of the two cathode rollers at the same time, the electrolyte solution, the cathode roller assembly, the conductive fiber immersed in the electrolyte solution, the anode, and the power supply are configured to form an electrolytic cell, and the cathode roller assembly and the conductive fiber located between the two cathode rollers together serve as the cathode of the electrolytic cell.
[0013] Compared with the prior art, the advantages of this utility model include:
[0014] This utility model provides a selective metal electrodeposition device for conductive fiber surfaces. The surface of the cathode roller is alternately covered with conductive and insulating materials. The special cathode roller, in conjunction with an electrodeposition reaction tank with adjustable length, can periodically and gradually plate conductive fibers with metal, thereby achieving selective metallization of the conductive fiber surface.
[0015] The selectively metallized carbon fiber prepared by this invention exhibits conductivity and linear density between that of carbon fiber and fully metallized carbon fiber composites, thus complementing the existing types and properties of metal composite fibers. The selectively metallized carbon fiber composite woven fabric prepared by this invention achieves weight reduction, improves wave absorption performance, and lowers the manufacturing cost of metal composite fiber materials and components. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of a selective metal electrodeposition device for conductive fiber surface provided in a typical embodiment of this utility model;
[0017] Figure 2 This is a schematic diagram of the electrodeposition reaction module in a conductive fiber surface selective metal electrodeposition device provided in a typical embodiment of this utility model;
[0018] Figure 3a This is a schematic diagram of the structure of a cathode roller with a fully conductive surface in the prior art;
[0019] Figure 3bThis is a schematic diagram of the structure of a cathode roller with a conductive area and an insulating area on the roller surface, provided in a typical embodiment of this utility model;
[0020] Figure 4 This is a schematic diagram of the position adjustment of the first baffle and the second baffle in a typical embodiment of this utility model;
[0021] Figure 5 This is a graph showing the relationship between the metal electrodeposition time on the carbon fiber surface and the carbon fiber length in Embodiment 1 of this utility model;
[0022] Figure 6 This is a graph showing the relationship between the metal electrodeposition time on the carbon fiber surface and the carbon fiber length in Embodiment 1 of this utility model;
[0023] Figure 7 This is a graph showing the relationship between the metal electrodeposition time on the carbon fiber surface and the carbon fiber length in Embodiment 1 of this utility model. Detailed Implementation
[0024] In view of the shortcomings of the prior art, the inventor of this case, through long-term research and extensive practice, has come up with the technical solution of this utility model. The following will further explain the technical solution, its implementation process, and its principles.
[0025] A first aspect of this utility model provides a selective metal electrodeposition apparatus for conductive fiber surfaces, comprising an electrodeposition reaction module, the electrodeposition reaction module comprising:
[0026] A reaction vessel having an electrodeposition reaction tank for containing an electrolytic solution and providing space for an electrodeposition reaction to occur, the length of the electrodeposition reaction tank in a first direction being adjustable;
[0027] A cathode roller assembly, comprising two identical cathode rollers, the two cathode rollers being respectively disposed on both sides of the electrodeposition reaction tank along the first direction, the cathode rollers being rotatable about their own axis, and the roller surface of the cathode rollers having m conductive areas and n insulating areas disposed along their own circumference, where m≥1 and n≥1;
[0028] The anode is disposed within the electrodeposition reaction tank;
[0029] A power source, wherein the positive terminal of the power source is electrically connected to the anode and the negative terminal is electrically connected to all conductive areas of the two cathode rollers;
[0030] When the conductive fiber immersed in the electrolytic solution contacts the conductive areas of the two cathode rollers simultaneously, the electrolytic solution, the cathode roller set, the conductive fiber immersed in the electrolytic solution, the anode, and the power supply are configured to form an electrolytic cell, and the cathode roller set and the conductive fiber located between the two cathode rollers as a whole serve as the cathode of the electrolytic cell.
[0031] Further, the length of the electrodeposition reaction tank in the first direction is equal to the sum of the arc lengths l of the m conductive areas on a single cathode roller along the circumferential direction of the cathode roller.
[0032] Further, the sum of the arc lengths l of the m conductive areas on a single cathode roller along the circumferential direction of the cathode roller satisfies: 1 / 6L < l < L, where L is the circumference of the cathode roller.
[0033] Further, the roller surface of the cathode roller is a cylindrical surface.
[0034] Further, the cathode roller includes a shaft roller and a conductive coating and an insulating coating coated on the surface of the shaft roller. The conductive coating forms the conductive area, the insulating coating forms the insulating area, and the negative pole of the power supply is electrically connected to the conductive coating.
[0035] Further, the shaft roller is a conductive member, and the negative pole of the power supply is electrically connected to the shaft roller.
[0036] Further, the reaction vessel includes a vessel body, a first baffle, and a second baffle. The first baffle and the second baffle are arranged at intervals in the vessel body along the first direction. The first baffle and the second baffle are in sealing cooperation with the vessel body. The first baffle, the second baffle, and the vessel body enclose to form the electrodeposition reaction tank. Moreover, the first baffle and / or the second baffle can also move along the first direction and always maintain a sealing cooperation state with the vessel body during the movement, so that the length of the electrodeposition reaction tank in the first direction is adjustable.
[0037] Further, the first baffle and the second baffle divide the internal space of the vessel body into a first chamber, a second chamber, and a third chamber arranged in sequence along the first direction. The second chamber serves as the electrodeposition reaction tank, and the two cathode rollers are respectively arranged in the first chamber and the third chamber.
[0038] Furthermore, the container body is also provided with an electrolyte solution inlet and an electrolyte solution outlet. The electrolyte solution inlet is directly connected to the electrodeposition reaction tank. The electrodeposition reaction module also includes an electrolyte solution supply mechanism, which is connected to the electrolyte solution inlet and the electrolyte solution outlet respectively. The electrolyte solution supply mechanism is used to input electrolyte solution into the electrodeposition reaction tank from the electrolyte solution inlet and to receive electrolyte solution flowing out from the electrolyte solution outlet.
[0039] Furthermore, the electrolyte solution inlet is directly connected to the second chamber, and the electrolyte solution outlet is directly connected to the first chamber and / or the third chamber.
[0040] In a more specific implementation, the electrodeposition reaction module further includes a cathode roller washing assembly for cleaning the cathode roller.
[0041] Furthermore, the cathode roller washing assembly includes a cleaning water supply mechanism and two water collection containers. The cleaning water supply mechanism is connected to the water collection containers and forms a loop for the cleaning water to circulate. The cleaning water supply mechanism is used to spray and clean the cathode roller. The water collection containers are located below the cathode roller and receive the cleaning water after the spray cleaning.
[0042] Furthermore, the two water collection containers are respectively disposed in the first chamber and the third chamber.
[0043] Furthermore, the two water collection containers are respectively part of the first chamber and the third chamber.
[0044] In a more specific embodiment, the electrodeposition reaction module further includes a water-blocking mechanism disposed between the electrodeposition reaction tank and the cathode roller, the water-blocking mechanism being used to extrude the solution carried by the wire fibers.
[0045] Furthermore, the water-blocking mechanism includes two parallel water-blocking bars, which are used to squeeze the conductive fibers passing between the two water-blocking bars.
[0046] Furthermore, the water-blocking rod includes a glass rod.
[0047] In a more specific implementation, the electrodeposition reaction module further includes: two sets of limiting rods, each set of limiting rods corresponding to one of the two cathode rollers, the limiting rods being arranged in parallel with the cathode rollers, the limiting rods being used to compress the conductive fibers and keep the conductive fibers in contact with the roller surface of the cathode rollers.
[0048] Furthermore, the limiting rod is capable of rotating around its own axis.
[0049] Furthermore, the limiting rod includes a sponge rod.
[0050] In a more specific embodiment, the electrodeposition reaction module further includes a shaking mechanism for shaking the conductive fibers immersed in the electrolyte solution.
[0051] Furthermore, the swaying mechanism includes a rocking mechanism, the swaying trajectory of which intersects with the travel trajectory of the conductive fiber within the electrodeposition tank.
[0052] Furthermore, the swing mechanism is an electrically operated swing mechanism.
[0053] Furthermore, the anode includes a titanium basket and a plated metal loaded within the titanium basket, and the positive terminal of the power supply is electrically connected to the titanium basket.
[0054] In a more specific embodiment, the conductive fiber surface selective metal electrodeposition apparatus further includes: a wire feeding module and a wire take-up module. The wire feeding module is located upstream of the electrodeposition reaction module, and the wire take-up module is located downstream of the electrodeposition reaction module. The wire feeding module feeds one or more rolls of conductive fiber, maintaining the same wire feeding rate and tension for each roll of conductive fiber. The wire take-up module is used to pull the conductive fiber, causing the conductive fiber to travel along the first direction and pass through the electrodeposition reaction module, and to collect the conductive fiber after selective metallization treatment.
[0055] In a more specific embodiment, the conductive fiber surface selective metal electrodeposition apparatus further includes a pretreatment module disposed between the wire feeding module and the electrodeposition reaction module, the pretreatment module being used to remove the sizing agent from the conductive fiber surface and / or to clean the conductive fiber.
[0056] In a more specific embodiment, the conductive fiber surface selective metal electrodeposition apparatus further includes a post-processing module, which is disposed between the electrodeposition reaction module and the take-up module, and is used to clean and dry the conductive fibers that have undergone surface selective metallization treatment.
[0057] A second aspect of this utility model embodiment also provides a method for selectively metallizing the surface of conductive fibers, comprising:
[0058] A selective metal electrodeposition apparatus for the conductive fiber surface is provided. An electrolyte solution is loaded into the electrodeposition reaction tank. The cathode and anode are connected to a power source so that the two cathode rollers rotate synchronously and in the same direction at a uniform speed.
[0059] Conductive fibers are made to pass through the electrodeposition reaction module at a uniform speed along the first direction. When passing through the electrodeposition reaction tank, they are immersed in the electrolyte solution. During the process, the conductive fibers keep in contact with the roller surfaces of the two cathode rollers and alternately contact the conductive area and insulating area of the cathode rollers in sequence. The timing and duration of the contact between the conductive fibers and the conductive or insulating areas of the two cathode rollers are the same, thereby obtaining segmented metallized composite fibers.
[0060] When the conductive fiber is in contact with the conductive areas of both cathode rollers simultaneously, the electrolytic solution, the cathode roller assembly, the conductive fiber located between the two cathode rollers, the anode, and the power source form an electrolytic cell, and the surface of the conductive fiber immersed in the electrolytic solution is plated to form a metal layer.
[0061] Furthermore, the traveling speed V of the conductive fiber along the first direction is 0 to 10 m / min.
[0062] Furthermore, the temperature of the electrolyte solution is 30℃~70℃.
[0063] Furthermore, the current density of the power supply is 0.01 A / dm². 2 ~10A / dm 2 .
[0064] Furthermore, the conductive fiber passes through the electrodeposition reaction tank for 0.1 min to 30 min.
[0065] Furthermore, the conductive fibers include carbon fibers, etc.
[0066] In a more specific embodiment, the method for selectively metallizing the conductive fiber further includes: shaking the conductive fiber immersed in the electrolyte solution at a frequency of 10 times / min to 60 times / min.
[0067] In a more specific embodiment, the method for selectively metallizing the conductive fibers further includes: first removing the sizing agent from the surface of the conductive fibers and / or cleaning the conductive fibers, and then passing the conductive fibers through the electrodeposition reaction module.
[0068] In a more specific implementation, the method for selectively metallizing the conductive fibers further includes cleaning and drying the conductive fibers that have undergone selective metallization by the electrodeposition reaction module.
[0069] In a more specific implementation, a conductive fiber roll is placed on a pay-off module, the conductive fiber is pulled along a first direction by a take-up module, and the pay-off tension of the conductive fiber is adjusted to 0-100N by the pay-off module.
[0070] A third aspect of this invention provides a metal composite fiber obtained by the method of selectively metallizing the surface of conductive fibers.
[0071] Furthermore, the conductive fiber includes carbon fiber.
[0072] A fourth aspect of this utility model provides a woven fabric formed by weaving the metal composite fibers.
[0073] The following will provide a further explanation of the technical solution, its implementation process, and its principles, in conjunction with the accompanying drawings and specific implementation examples.
[0074] In a more typical implementation scheme, please refer to Figure 1 A selective metal electrodeposition apparatus for conductive fiber surface includes a wire feeding module 100, a pretreatment module 200, an electrodeposition reaction module 300, a post-treatment module 400, and a wire take-up module 500 arranged sequentially along a first direction. The electrodeposition reaction module 300 serves as the core module and is used to selectively metallize the conductive fiber, forming a periodically distributed metal layer on the surface of the conductive fiber, thereby obtaining a segmented metal composite fiber. The wire feeding module 100 and the wire take-up module 500 cooperate to realize the wire feeding and take-up of the conductive fiber, so that the conductive fiber can travel continuously along the first direction. The pretreatment module 200 is used to pre-treat the conductive fiber, and the post-treatment module 400 is used to post-treat the metal composite fiber.
[0075] Specifically, the structures of the wire feeding module 100, pre-processing module 200, post-processing module 400 and wire take-up module 500 in this application are all known in the art and are not considered as improvements to this utility model. Therefore, only a brief overview and description of their structures are given below.
[0076] Specifically, the pay-off module 100 is used to pay off one or more rolls of conductive fiber, and the take-up module 500 is used to take up one or more rolls of metal composite fiber (conductive fiber that has undergone selective metallization treatment can still be called conductive fiber). As known to those skilled in the art, the pay-off module 100 generally includes one or more freely rotatable pay-off rollers, which are used to fix the conductive fiber rolls, and the conductive fiber rolls can rotate together with the pay-off rollers. Preferably, the pay-off module 100 may also include a speed adjustment mechanism for adjusting the speed of the pay-off rollers, etc., by adjusting the speed of the pay-off rollers, the tension and pay-off rate of the conductive fiber during travel can be adjusted. Preferably, the pay-off module 100 may also include a guide wheel for guiding the conductive fiber to maintain a straight path, and the pay-off module 100 may also include a pay-off frame, on which the pay-off rollers and guide wheels can be mounted. The take-up module 500 generally includes one or more take-up rollers and a rotary drive mechanism. The take-up rollers and the rotary drive mechanism are connected by a drive mechanism, and the take-up rollers can rotate under the drive mechanism to achieve the traction and collection of conductive fibers / metal composite fibers. Preferably, the take-up module 500 may also include guide wheels for guiding the conductive fibers to maintain a straight path, and the take-up module 500 may also include a take-up frame, on which the take-up rollers and guide wheels can be mounted.
[0077] Specifically, the pretreatment module 200 is used to remove the sizing agent from the surface of the conductive fibers and / or to clean the conductive fibers, i.e., the aforementioned pretreatment. For example, the pretreatment module 200 may include a high-temperature treatment chamber, a pre-impregnation tank, and / or a spraying mechanism, etc., whereby the high-temperature treatment chamber is used to remove the sizing agent from the surface of the conductive fibers, and the pre-impregnation tank and / or the spraying mechanism is used to clean the conductive fibers. Specifically, the post-treatment module 400 is used to clean and dry the conductive fibers that have undergone surface selective metallization treatment. Specifically, the post-treatment module 400 may include a washing mechanism and an oven arranged sequentially.
[0078] The following section will mainly introduce and explain the structure and working principle of the core part of this utility model - the electrodeposition reaction module 300.
[0079] Please refer to the following: Figure 1 , Figure 2The electrodeposition reaction module 300 includes a reaction container 310, a cathode roller assembly, an anode 330, and a power supply 340. The reaction container 310 has an electrodeposition reaction tank 315, which is used to contain the electrolytic solution and provide space for the electrodeposition reaction to occur. The length of the electrodeposition reaction tank 315 in a first direction can be adjusted. The cathode roller assembly includes two identical cathode rollers 320, which are respectively arranged on both sides of the electrodeposition reaction tank 315 along the first direction. The cathode rollers 320 are rotatable about their own axes. The cathode roller 320 has m conductive areas 321 and n insulating areas 322 arranged along its circumference, where m≥1 and n≥1; the anode 330 is arranged in the electrodeposition reaction tank 315, specifically at the bottom of the electrodeposition reaction tank 315; the positive terminal of the power supply 340 is electrically connected to the anode 330, and the negative terminal is electrically connected to all conductive areas 321 of the two cathode rollers 320; the conductive fibers of the electrodeposition reaction module 300 contact the roller surfaces of the two cathode rollers 320 and are immersed in the electrolyte solution of the electrodeposition reaction tank 315.
[0080] When the conductive fibers immersed in the electrolyte solution simultaneously come into contact with the conductive areas 321 of the two cathode rollers 320, the electrolyte solution, the cathode roller assembly, the conductive fibers immersed in the electrolyte solution, the anode 330, and the power supply 340 are configured to form an electrolytic cell. The cathode roller assembly and the conductive fibers located between the two cathode rollers 320 together serve as the cathode of the electrolytic cell. The surface of the conductive fibers immersed in the electrolyte solution is plated to form a metal layer. However, when the conductive fibers immersed in the electrolyte solution simultaneously come into contact with the insulating areas 322 of the two cathode rollers 320, no metal plating occurs on the surface of the conductive fibers. As the cathode rollers 320 rotate, the conductive fibers periodically come into contact with the conductive areas 321 and insulating areas 322 of the roller surface of the cathode rollers 320 alternately, thereby forming periodically distributed metal segments on the conductive fibers, i.e., segmented metallized composite fibers.
[0081] It should be noted that the two cathode rollers 320 are completely identical, meaning their structure and dimensions are the same. In particular, the distribution, number, and area ratio of the conductive areas 321 in both cathode rollers 320 are identical. Furthermore, during the rotation of the two cathode rollers 320, the positions of the conductive areas 321 remain the same. That is, at any given moment, the conductive fiber is always in contact with both conductive areas 321 or both insulating areas 322 simultaneously. Moreover, the timing and duration of contact between the conductive fiber and each conductive area 321 of the two cathode rollers are identical. The cathode rollers 320 can be driven by the frictional force between the conductive fiber and the cathode roller 320, or they can be driven by a drive motor, preferably a drive motor.
[0082] Specifically, the surface of the cathode roller 320 is preferably a cylindrical surface. The length of the electrodeposition reaction tank 315 in the first direction is equal to the sum of the arc lengths l of the m conductive areas 321 on a single cathode roller 320 along the circumference of the cathode roller 320. Preferably, the sum of the arc lengths l of the m conductive areas 321 on a single cathode roller 320 along the circumference of the cathode roller 320 satisfies: 1 / 6L≤l<L, where L is the circumference of the cathode roller 320, that is, the circumference of the radial section of the cathode roller 320.
[0083] Figure 3a The cathode roller 320 is a common type with fully conductive surface, and the arc length of its conductive area 321 is equal to the perimeter L of the cross section. Figure 3b The cathode roller 320 used in this invention has a partially conductive surface, where m = n = 1, and the central angle corresponding to its conductive area 321 is α°, i.e., the arc length of the conductive area 321 is l = (αL) / 360, where 60 ≤ α < 360. Specifically, the cathode roller 320 includes a shaft roller and a conductive coating and an insulating coating coated on the surface of the shaft roller. The conductive coating forms the conductive area 321, and the insulating coating forms the insulating area 322. The negative terminal of the power supply 340 is electrically connected to the conductive coating. Of course, the shaft roller can be a conductive component, with the negative terminal of the power supply 340 electrically connected to the shaft roller and then electrically connected to the conductive coating via the shaft roller.
[0084] Please refer to the following for details. Figure 2 and Figure 4 The reaction vessel 310 includes a vessel body 311 and a first baffle 312 and a second baffle 313. The first baffle 312 and the second baffle 313 are spaced apart within the vessel body 311 along a first direction. The first baffle 312 and the second baffle 313 are sealed to the vessel body 311. The first baffle 312 and the second baffle 313 and the vessel body 311 enclose an electrodeposition reaction tank 315. The two ends of the cathode roller 320 are rotatably engaged with the vessel body 311. The first baffle 312 and / or the second baffle 313 can also move along the first direction and maintain a sealed engagement with the vessel body 311 during the movement. This makes the length of the electrodeposition reaction tank 315 in the first direction adjustable. It should be noted that the structure and method by which the first baffle 312 and / or the second baffle 313 maintain a sealed engagement with the vessel body 311 during the movement are known in the art and will not be described in detail here.
[0085] Specifically, two identical cathode rollers 320 are installed at both ends of the electrodeposition reaction tank 315, and the conductive areas 321 or insulating areas 322 of the two cathode rollers 320 must be in synchronous contact with the conductive fibers. Simultaneously, the length of the electrodeposition reaction tank 315 needs to be adjusted to be equal to the arc length l of the conductive area 321 of a single cathode roller 320. Please refer again. Figure 4Points A and D represent the maximum movement positions of the first baffle 312 and the second baffle 312, respectively. Line segment AB represents the movement range of the first baffle 312, line segment CD represents the movement range of the second baffle 313, and line segment BC represents the space occupied by the anode 330. The lengths of each line segment are: AD = L, BC = 1 / 6L, AB = CD = 5 / 12L. Specifically, the first baffle 312 can move and be fixed between points A and B without solution leakage, and the second baffle 313 can move and be fixed between points C and D without solution leakage. By adjusting the positions of the first baffle 312 and the second baffle 313, the distance between the first baffle 312 and the second baffle 313 can be between 1 / 6L and L, meaning the effective reaction length of the conductive fiber in the electrodeposition reaction tank 315 is between 1 / 6L and L.
[0086] Specifically, when the central angle corresponding to the conductive area 321 of the cathode roller 320 is α°, the positions of the movable first baffle 312 and / or the second baffle 313 need to be adjusted so that the interval between the first baffle 312 and the second baffle 313 is (αL) / 360, corresponding to an effective metallization length of (αL) / 360 for the conductive fiber in the electrodeposition reaction tank 315, which is equal to the arc length corresponding to the conductive area 321 of the cathode roller 320. At this time, selective metal electrodeposition of the conductive fiber can prepare a metal composite fiber with a period of the radial cross-sectional perimeter L of the cathode roller 320, where (αL) / 360 represents the gradual change in the amount of metal electrodeposition on the conductive fiber surface, and the L-(αL) / 360 portion represents the length of the conductive fiber without metal plating on its surface.
[0087] For details, please refer to the following document again. Figure 2 and Figure 4 The first baffle 312 and the second baffle 313 divide the internal space of the container body 311 into a first chamber 314, a second chamber, and a third chamber 316 arranged sequentially along the first direction. The second chamber serves as an electrodeposition reaction tank 315, and two cathode rollers 320 are respectively arranged in the first chamber 314 and the third chamber 316.
[0088] Specifically, the container body 311 is also provided with an electrolyte solution inlet 317 and an electrolyte solution outlet 318. The electrolyte solution inlet 317 is directly connected to the electrodeposition reaction tank 315. The electrodeposition reaction module 300 also includes an electrolyte solution supply mechanism, which is connected to both the electrolyte solution inlet 317 and the electrolyte solution outlet 318. The electrolyte solution supply mechanism is used to input electrolyte solution from the electrolyte solution inlet 317 into the electrodeposition reaction tank 315 and to receive electrolyte solution flowing out from the electrolyte solution outlet 318. Specifically, the electrolyte solution inlet 317 is located at the bottom of the second chamber, and the electrolyte solution outlet 318 is located at the bottom of the first chamber 314 and / or the third chamber 316.
[0089] For details, please refer to the following document again. Figure 2 The electrodeposition reaction module 300 may further include a cathode roller washing assembly 350, which is used to clean the cathode roller 320. Specifically, the cathode roller washing assembly 350 includes a cleaning water supply mechanism 351 and two water collection containers 352. The cleaning water supply mechanism 351 is connected to the water collection containers 352, forming a loop for the circulation of cleaning water. The cleaning water supply mechanism 351 is used to spray and clean the cathode roller 320. The water collection containers 352 are located below the cathode roller 320 and collect the cleaning water after spray cleaning. Specifically, the two water collection containers 352 are respectively located in the first chamber 314 and the third chamber 316. As a preferred structure, the two water collection containers 352 are each a part of the first chamber 314 and the third chamber 316.
[0090] For details, please refer to the following document again. Figure 2 The electrodeposition reaction module 300 may further include a water-blocking mechanism 360 disposed between the electrodeposition reaction tank 315 and the cathode roller 320. The water-blocking mechanism 360 is capable of contacting the conductive fibers passing through the two cathode rollers 320. The water-blocking mechanism 360 is used to expel the solution carried by the conductive fibers to isolate and block overflowing solution within the electrodeposition reaction tank 315. As a typical structure, the water-blocking mechanism 360 includes two parallel water-blocking bars, which are used to squeeze the conductive fibers passing between the two water-blocking bars. Exemplarily, the water-blocking bars include glass rods.
[0091] For details, please refer to the following document again. Figure 2 The electrodeposition reaction module 300 may further include two sets of limiting rods 370, each corresponding to one of the two cathode rollers 320. The limiting rods 370 and cathode rollers 320 are arranged in parallel. The limiting rods 370 are used to compress the conductive fibers and keep the conductive fibers in contact with the roller surface of the cathode rollers 320. To reduce wear on the conductive fibers caused by the limiting rods 370, the limiting rods 370 are preferably configured to rotate about their own axis. For example, the limiting rods 370 include sponge rods.
[0092] For details, please refer to the following document again. Figure 2 The electrodeposition reaction module 300 also includes a shaking mechanism 380 for shaking the conductive fibers immersed in the electrolyte solution. As a typical example, the shaking mechanism 380 can be a rocking mechanism whose swing trajectory intersects with the travel trajectory of the conductive fibers within the electrodeposition tank. Exemplarily, the rocking mechanism is an electrically operated rocking mechanism.
[0093] Specifically, the anode 330 includes a titanium basket and the plated metal contained within the titanium basket, and the positive terminal of the power supply 340 is electrically connected to the titanium basket.
[0094] In a typical implementation, a method for selectively metallizing the surface of conductive fibers specifically includes the following steps:
[0095] The aforementioned selective metal electrodeposition apparatus for conductive fiber surfaces is provided. The limiting rod is a sponge rod with a diameter of 20mm to 80mm. The central angle corresponding to the conductive area of the cathode roller is α°. An electrolytic solution is placed in the electrodeposition reaction tank at a temperature of 30℃ to 70℃. The cathode and anode are connected to a power source. The limiting rod rotates with the cathode roller.
[0096] The conductive fiber roll is placed on the pay-off module, and one end of the conductive fiber is fixed on the take-up module. The take-up module provides traction to the conductive fiber, allowing it to pass sequentially through the pretreatment module, electrodeposition reaction module, and post-treatment module along the first direction, and then be wound up on the take-up module. The conductive fiber passes through the electrodeposition reaction module at a constant speed along the first direction and is immersed in the electrolyte solution when passing through the electrodeposition reaction tank. During its travel, the conductive fiber maintains contact with the roller surfaces of the two cathode rollers. The pay-off tension is adjusted to 0N to 100N, and the travel speed V of the conductive fiber is adjusted to 0m / min to 10m / min. The speed-regulating motor drives the cathode rollers to rotate at a constant speed.
[0097] In the pretreatment module, the sizing agent on the surface of the conductive fiber is removed by high temperature. The pretreatment temperature is 200℃~700℃ and the time is 1min~30min. After that, the conductive fiber is soaked and cleaned with deionized water at a temperature of 20℃~50℃ for 0.1min~30min. After the pretreatment, the limiting bar presses down on the conductive fiber to make the conductive fiber fit tightly against the cathode roller.
[0098] Inside the electrodeposition reactor, an electrically driven oscillating device moves the conductive fibers from side to side to completely disperse them. The oscillation frequency is 10 to 60 times per minute. Surface-selective metal electrodeposition is then performed on the conductive fibers (e.g., carbon fibers of 1K, 3K, 6K, 12K, 24K, etc.) to form metal composite fibers. The current density supplied by the power source is 0.01 A / dm³. 2 ~10A / dm 2 The conductive fiber passes through the electrodeposition reaction tank for 0.1 min to 30 min, that is, the conductive fiber is held in the electrodeposition reaction tank for 0.1 min to 30 min.
[0099] In the post-processing module, the metal composite fibers are cleaned with deionized water at 20℃~60℃ for 0.1min~30min. The cleaned metal composite fibers are then dried in an oven at 50℃~300℃ for 0.1min~30min.
[0100] Example 1
[0101] This embodiment demonstrates selective metal electrodeposition on a single 24K carbon fiber tow. The cathode roller used in this embodiment has a diameter of 40 cm. The roller surface consists of a conductive area and an insulating area. The central angle α corresponding to the conductive area is 180°, therefore the arc length of the conductive area is 62.8 cm. The electrolyte solution in the electrodeposition reaction tank is a nickel plating solution at a temperature of 50°C. The desizing temperature for the carbon fiber pretreatment is 500°C, and the desizing time is 6 min. The carbon fiber take-up speed is 10 cm / min, and the current density on the carbon fiber surface is 0.25 A / dm³. 2 After metallization of the carbon fiber surface, it is washed with water and dried in an oven at 100°C to obtain selective metal composite carbon fiber.
[0102] In this embodiment, the relationship between the metal electrodeposition time on the carbon fiber surface and the carbon fiber length is as follows: Figure 5 As shown, the horizontal axis represents the length period, with each unit length being the cross-sectional circumference of the cathode roller, L = 125.6 cm; the vertical axis represents the time taken for the cathode roller to rotate one revolution, i.e., T = L / V = 12.56 min. The length period of this selective metal composite carbon fiber is 125.6 cm, and the electrodeposition time within each period is 6.28 min. 62.8 cm represents the metal composite carbon fiber with gradually increasing electrodeposition, while the remaining 62.8 cm represents the carbon fiber without any metal coating.
[0103] Example 2
[0104] This embodiment demonstrates selective metal electrodeposition on a single 12K carbon fiber tow. The cathode roller used in this embodiment has a diameter of 40 cm. The roller surface consists of a conductive area and an insulating area. The central angle α corresponding to the conductive area is 90°, and the arc length of the conductive area is 31.4 cm. The electrolytic solution in the electrodeposition reaction tank is a nickel plating solution at a temperature of 50°C. The desizing temperature for the carbon fiber pretreatment is 500°C, the desizing time is 6 min, the carbon fiber take-up speed is 10 cm / min, and the current density on the carbon fiber surface is 0.5 A / dm³. 2 After metallization of the carbon fiber surface, it is washed with water and dried in an oven at 90°C to obtain selective metal composite carbon fiber.
[0105] In this embodiment, the relationship between the metal electrodeposition time on the carbon fiber surface and the carbon fiber length is as follows: Figure 6 As shown, Figure 6The horizontal axis represents the length period, with each unit length being the cross-sectional circumference of the cathode roller, L = 125.6 cm; the vertical axis represents the time taken for the cathode roller to rotate one revolution, i.e., T = L / V = 12.56 min. The length period of this selective metal-composite carbon fiber is 125.6 cm, and the electrodeposition time within each period is 3.14 min. 31.4 cm represents the metal-composite carbon fiber with gradually increasing electrodeposition, and 94.2 cm represents carbon fiber without any metal coating.
[0106] Example 3
[0107] This embodiment demonstrates selective metal electrodeposition on a single 3K carbon fiber tow. The cathode roller used in this embodiment has a diameter of 40 cm. The roller surface consists of a conductive area and an insulating area. The central angle α corresponding to the conductive area is 60°, and the arc length of the conductive area is 20.9 cm. The electrolytic solution in the electrodeposition reaction tank is a nickel plating solution at a temperature of 50°C. The desizing temperature for the carbon fiber pretreatment is 500°C, the desizing time is 6 min, the carbon fiber take-up speed is 10 cm / min, and the current density on the carbon fiber surface is 0.725 A / dm³. 2 After metallization of the carbon fiber surface, it is washed with water and dried in an oven at 90°C to obtain selective metal composite carbon fiber.
[0108] In this embodiment, the relationship between the metal electrodeposition time on the carbon fiber surface and the carbon fiber length is as follows: Figure 7 Show, Figure 7 The horizontal axis represents the period in degrees, with each unit length being the cross-sectional circumference of the cathode roller, L = 125.6 cm; the vertical axis represents the time taken for the cathode roller to rotate one revolution, i.e., T = L / V = 12.56 min. The length period of this selective metal-composite carbon fiber is 125.6 cm, and the electrodeposition time within each period is 2.09 min. 20.9 cm represents the metal-composite carbon fiber with gradually increasing electrodeposition, and 104.7 cm represents the carbon fiber without any metal coating.
[0109] This utility model provides a selective metal electrodeposition device for conductive fiber surfaces. The surface of the cathode roller is alternately covered with conductive and insulating materials. The special cathode roller, in conjunction with an electrodeposition reaction tank with adjustable length, can periodically and gradually plate conductive fibers with metal, thereby achieving selective metallization of the conductive fiber surface.
[0110] The selectively metallized carbon fiber prepared by this invention exhibits conductivity and linear density between that of carbon fiber and fully metallized carbon fiber composites, thus complementing the existing types and properties of metal composite fibers. The selectively metallized carbon fiber composite woven fabric prepared by this invention achieves weight reduction, improves wave absorption performance, and lowers the manufacturing cost of metal composite fiber materials and components.
[0111] It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A device for selective metal electrodeposition on the surface of conductive fibers, characterized in that, Includes an electrodeposition reaction module, the electrodeposition reaction module comprising: A reaction vessel having an electrodeposition reaction tank for containing an electrolytic solution and providing space for an electrodeposition reaction to occur, the length of the electrodeposition reaction tank in a first direction being adjustable; A cathode roller assembly, comprising two identical cathode rollers, the two cathode rollers being respectively disposed on both sides of the electrodeposition reaction tank along the first direction, the cathode rollers being rotatable about their own axis, and the roller surface of the cathode rollers having m conductive areas and n insulating areas disposed along their own circumference, where m≥1 and n≥1; The anode is disposed within the electrodeposition reaction tank; A power source, wherein the positive terminal of the power source is electrically connected to the anode and the negative terminal is electrically connected to all conductive areas of the two cathode rollers; When the conductive fiber immersed in the electrolyte solution comes into contact with the conductive areas of the two cathode rollers at the same time, the electrolyte solution, the cathode roller assembly, the conductive fiber immersed in the electrolyte solution, the anode, and the power supply are configured to form an electrolytic cell, and the cathode roller assembly and the conductive fiber located between the two cathode rollers together serve as the cathode of the electrolytic cell.
2. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 1, characterized in that: The sum of the length of the electrodeposition reaction tank in the first direction and the arc length of the m conductive regions on a single cathode roller along the circumference of the cathode roller. l equal.
3. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 2, characterized in that: The sum of the arc lengths of the m conductive regions on a single cathode roller along the circumference of the cathode roller. l Satisfy: 1 / 6L≤ l <L, where L is the circumference of the cathode roller.
4. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 2, characterized in that: The surface of the cathode roller is cylindrical.
5. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 2, characterized in that: The cathode roller includes a shaft roller and a conductive coating and an insulating coating coated on the surface of the shaft roller. The conductive coating forms the conductive area, and the insulating coating forms the insulating area. The negative terminal of the power supply is electrically connected to the conductive coating.
6. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 5, characterized in that: The roller is a conductive component, and the negative terminal of the power supply is electrically connected to the roller.
7. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 2, characterized in that: The reaction vessel includes a container body and a first baffle and a second baffle. The first baffle and the second baffle are spaced apart within the container body along the first direction. The first baffle and the second baffle are sealed to the container body. The first baffle and the second baffle together with the container body form the electrodeposition reaction tank. Furthermore, the first baffle and / or the second baffle can move along the first direction and maintain a sealed fit with the container body during the movement, thereby making the length of the electrodeposition reaction tank in the first direction adjustable.
8. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 7, characterized in that: The first baffle and the second baffle divide the internal space of the container body into a first chamber, a second chamber and a third chamber arranged sequentially along the first direction. The second chamber serves as the electrodeposition reaction tank, and the two cathode rollers are respectively arranged in the first chamber and the third chamber.
9. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 8, characterized in that: The container body is also provided with an electrolyte solution inlet and an electrolyte solution outlet. The electrolyte solution inlet is directly connected to the electrodeposition reaction tank. The electrodeposition reaction module also includes an electrolyte solution supply mechanism, which is connected to the electrolyte solution inlet and the electrolyte solution outlet respectively. The electrolyte solution supply mechanism is used to input electrolyte solution from the electrolyte solution inlet to the electrodeposition reaction tank and to receive electrolyte solution flowing out from the electrolyte solution outlet.
10. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 9, characterized in that: The electrolyte solution inlet is directly connected to the second chamber, and the electrolyte solution outlet is directly connected to the first chamber and / or the third chamber.
11. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 8, characterized in that, The electrodeposition reaction module further includes a cathode roller washing assembly, which is used to clean the cathode roller.
12. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 11, characterized in that: The cathode roller washing assembly includes a cleaning water supply mechanism and two water collection containers. The cleaning water supply mechanism is connected to the water collection containers and forms a loop for the cleaning water to circulate. The cleaning water supply mechanism is used to spray and clean the cathode roller. The water collection containers are located below the cathode roller and receive the cleaning water after the spray cleaning.
13. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 12, characterized in that: The two water collection containers are respectively installed in the first chamber and the third chamber.
14. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 12, characterized in that: The two water collection containers are respectively part of the first chamber and the third chamber.
15. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 7, characterized in that, The electrodeposition reaction module further includes a water-blocking mechanism, which is disposed between the electrodeposition reaction tank and the cathode roller, and is used to extrude the solution carried by the wire fibers.
16. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 15, characterized in that: The water-blocking mechanism includes two parallel water-blocking bars, which are used to squeeze the conductive fibers passing between the two water-blocking bars.
17. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 16, characterized in that: The water-blocking rod includes a glass rod.
18. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 1 or 7, characterized in that, The electrodeposition reaction module further includes two sets of limiting rods, each set corresponding to one of the two cathode rollers. The limiting rods are arranged in parallel with the cathode rollers and are used to compress the conductive fibers and keep the conductive fibers in contact with the roller surface of the cathode rollers.
19. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 18, characterized in that: The limiting rod is capable of rotating around its own axis.
20. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 18, characterized in that: The limiting rod includes a sponge rod.
21. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 1 or 7, characterized in that, The electrodeposition reaction module further includes a shaking mechanism for shaking the conductive fibers immersed in the electrolyte solution.
22. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 21, characterized in that: The swaying mechanism includes a rocking mechanism, the swaying trajectory of which intersects with the travel trajectory of the conductive fiber in the electrodeposition tank.
23. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 22, characterized in that: The swing mechanism is an electric swing mechanism.
24. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 21, characterized in that: The anode includes a titanium basket and a plated metal loaded inside the titanium basket, and the positive terminal of the power supply is electrically connected to the titanium basket.
25. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 1, characterized in that, Also includes: The electrodeposition reaction module includes a pay-off module and a take-up module. The pay-off module is located upstream of the electrodeposition reaction module, and the take-up module is located downstream of the electrodeposition reaction module. The pay-off module pays off one or more rolls of conductive fiber, maintaining the same pay-off rate and tension for each roll. The take-up module pulls the conductive fiber, causing it to travel along the first direction and pass through the electrodeposition reaction module, and collects the conductive fiber after selective metallization treatment.
26. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 25, characterized in that, Also includes: A pretreatment module is disposed between the wire feeding module and the electrodeposition reaction module. The pretreatment module is used to remove the sizing agent from the surface of the conductive fiber and / or to clean the conductive fiber.
27. The selective metal electrodeposition apparatus for conductive fiber surfaces according to claim 25, characterized in that, Also includes: A post-processing module is disposed between the electrodeposition reaction module and the take-up module. The post-processing module is used to clean and dry the conductive fibers that have undergone surface selective metallization treatment.