A method for preparing graphene bonded copper wire

Abstract

The invention discloses a preparation method of graphene-bonded copper wire, which belongs to the field of graphene-bonded copper wire preparation. A preparation method of graphene-bonded copper wire can realize first oscillating the graphene in the solution through an ultrasonic generator, and then, with the cooperation of a motor and a related transmission structure, the bristles on the brush plate can rotationally coat the surface of the copper wire. During the coating process, the setting of the piston block can accelerate the graphene concentration in the solution near the copper wire, and the synchronous movement of the oscillation mechanism can avoid the accumulation of graphene precipitates, and further increase the concentration of graphene in the solution. Compared with traditional immersion coating and other coatings, this method, in conjunction with the coating mechanism, can better generate a graphene film with a uniform surface, and has high coating efficiency, without the need for multiple coatings, greatly reducing production costs and processing time, and improving the production efficiency of graphene film-bonded copper wire.

Description

Technical Field

[0001] The present invention relates to the field of graphene bonded copper wire preparation, and more particularly to a method for preparing a graphene bonded copper wire. Background Art

[0002] Graphene is a new two-dimensional honeycomb carbon material. Due to its unique structure, graphene has many excellent properties. Because graphene has so many excellent properties, stably dispersed graphene dispersion has huge application prospects. It can be used in battery slurries as a conductive agent, a conductive additive for battery electrode materials, a catalyst, supercapacitors, solar cells, graphene semiconductor chips, conductive graphite films, graphene computer memory, biomaterials, transparent conductive coatings and many other fields.

[0003] Gold wire, or gold bonding wire, is the primary bonding material for semiconductor package leads, particularly those used in integrated circuits and discrete semiconductor devices. Gold bonding wire is a relatively mature product with advantages such as stable chemical properties. However, it also has inherent drawbacks: First, it is relatively expensive. As gold prices rise, this significantly increases manufacturing costs for integrated circuit and discrete semiconductor device packaging plants both domestically and internationally. Second, its electrical conductivity as a connecting lead is poor, and the reliability of the interconnect after soldering is inferior to that of copper wire. Consequently, the research and development of graphene copper bonding wire technology has led to the development of a dense graphene film coated on the surface of the copper bonding wire, improving its performance as a connecting lead.

[0004] Traditional graphene bonding copper wires are generally prepared using a simple coating method, ultrasonic method, or repeated immersion method. This is not only time-consuming, but also results in uneven distribution of the graphene film generated on the surface. The used graphene solution is severely precipitated and has a short service life. Repeated addition of liquid is required, resulting in low production efficiency and high production costs. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] In response to the problems existing in the prior art, the purpose of the present invention is to provide a preparation method for graphene bonded copper wire, which can realize first oscillating the graphene in the solution through an ultrasonic generator, and then with the cooperation of the motor and related transmission structure, the bristles on the brush plate can rotate and coat the surface of the copper wire. During the coating process, the setting of the piston block can accelerate the concentration of graphene in the solution near the copper wire, and the synchronous movement of the oscillation mechanism can avoid the accumulation of graphene precipitates and further increase the concentration of graphene in the solution. Compared with traditional immersion coating and other coatings, this method, in conjunction with the coating mechanism, can better generate a graphene film with a uniform surface, and has high coating efficiency, without the need for multiple coatings, which greatly reduces production costs and processing time, and improves the production efficiency of graphene film bonded copper wire.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A method for preparing a graphene-bonded copper wire comprises the following steps:

[0010] S1. calcining the prepared copper rod and drawing it into a bonding copper wire of qualified size;

[0011] S2, annealing the drawn copper wire for later use;

[0012] S3, preparing a graphene solution, adding graphite flakes into a container, and adding an appropriate amount of ethanol solution and stirring;

[0013] S4. After standing for a period of time, pour off the ethanol solution and retain the lower sediment;

[0014] S5, adding appropriate amount of polyvinyl pyrrolidone and 1-methyl-2-pyrrolidone solution into the container;

[0015] S6. Place the prepared solution into an ultrasonic machine for ultrasonic treatment for a period of time;

[0016] S7, extracting the supernatant of the solution treated in S6, placing it in a centrifuge for centrifugation, and then obtaining a finished graphene solution;

[0017] S8. Install the annealed copper wire in a coating mechanism, add the graphene solution obtained in S7 into the coating mechanism, and start the coating mechanism to coat the copper wire.

[0018] S9, taking out the coated copper wire and performing oxidation-reduction on the graphene solution on the surface of the copper wire using a reducing agent;

[0019] S10, washing and drying the reduced copper wire to obtain a finished graphene-bonded copper wire.

[0020] Furthermore, the reducing agent is a mixture of one or more of hydrazine, hydroiodic acid, and vitamin C.

[0021] Furthermore, the rotation speed of the centrifuge is 3500 rpm, and the centrifugation time is 10-30 min.

[0022] Furthermore, the usage amount of the 1-methyl-2-pyrrolidone solution is 50-80 ml.

[0023] Furthermore, the stirring time is 15 minutes and the standing time is 20 minutes.

[0024] Furthermore, the ultrasound time of the ultrasound machine in S6 is 80-120 hours.

[0025] The transmission gear of the present invention is a gear which is engaged with the gear of the said gear and the gear of the said gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear is engaged with the gear of the said gear and the gear Multiple groups of bristles are provided on the side of the plate close to the copper wire. Through the setting of the ultrasonic generator, the graphene solution in the coating box can be oscillated in real time, so that it is better distributed in the solution and combined with the surface of the copper wire. During this process, the output shaft of the motor will also drive the first gear to rotate, and the first gear will drive the second gear to rotate, and the rotation of the second gear will drive the connecting shaft to rotate, and finally drive the connecting frame fixedly connected between the connecting shaft and the clamping block to rotate synchronously. During this process, one end of the copper wire is stably clamped in the first groove on the concave mounting block, and the other end is movably inserted in the second groove on the connecting shaft. As the connecting frame rotates, the brush plate can be driven to rotate, and the bristles and the continuous rotation around the copper wire can be used to perform a rotational coating on the surface of the copper wire. Combined with ultrasonic oscillation, a double coating effect can be achieved, which greatly enhances the uniformity and efficiency of the coating on the copper wire surface.

[0026] Furthermore, a clamping block compatible with the concave mounting block and the rotating ring is clamped in the groove of the rotating ring. By setting the clamping block, it is convenient to quickly disassemble and assemble the copper wire, and it is convenient for the copper wire to be clamped and limited by the first groove and the second groove, so that the bristles on the brush plate can better coat the surface of the copper wire.

[0027] Furthermore, a cavity is provided in the brush plate, and a piston block is slidably connected in the cavity. The brush plate is provided with multiple third gears on one side of the bristles. The piston block is made of heavy non-magnetic material. By sliding the piston block connected to the brush plate cavity, it can be achieved that when the brush plate rotates, as the direction of the brush plate changes, the heavy piston block will slide at the upper and lower extreme positions, and in the process of sliding up and down, the solution in the coating box will be continuously sucked in, and sprayed out when the bristles are coating the copper wire, thereby increasing the graphene content near the bristles and further improving the coating effect.

[0028] Furthermore, a plurality of oscillation mechanisms for rolling up the sediment are fixedly installed at the bottom of the coating box, and the oscillation mechanism includes a connecting block, which is screwed to the bottom of the inner wall of the coating box, and the top of the connecting block is fixedly connected to an elastic spring wire, and the top of the spring wire is fixedly connected to a magnetic bead, and the side of the brush plate away from the bristles is fixedly connected to a magnetic strip. Through the magnetic attraction between the magnetic strip and the magnetic beads, the connection frame can carry the brush plate to rotate, and then drive the magnetic strip to rotate in the coating box. As the distance between the magnetic strip and the multiple oscillation mechanisms changes, the magnetic beads at different positions can be attracted to shake. In this process, the spring wire is stretched or compressed, thereby achieving a reciprocating swinging effect, so that the graphene sediment precipitated in the coating box is redistributed evenly in the solution, thereby improving the coating effect.

[0029] 3. Beneficial effects

[0030] Compared with the prior art, the advantages of the present invention are:

[0031] The graphene in the solution is first oscillated by an ultrasonic generator, and then the bristles on the brush plate can be rotated to coat the surface of the copper wire with the cooperation of the motor and related transmission structure. During the coating process, the setting of the piston block can accelerate the concentration of graphene in the solution near the copper wire, and the synchronous movement of the oscillation mechanism can avoid the accumulation of graphene precipitates and further increase the concentration of graphene in the solution. The ultrasonic treatment and the rotary coating of the coating mechanism cooperate with each other to accelerate the combination of graphene and the copper wire surface to obtain a bonded copper wire coated with a graphene film. Compared with traditional immersion coating and other coating methods, this method, in conjunction with the coating mechanism, can better generate a graphene film with a uniform surface, and has high coating efficiency, without the need for multiple coatings, which greatly reduces production costs and processing time, and improves the production efficiency of graphene film bonded copper wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 For the present invention Figure 1 A schematic diagram of the structure of the middle A area;

[0034] Figure 3 It is a structural schematic diagram of the mounting plate in the present invention;

[0035] Figure 4 Schematic diagram of the structure of the oscillation mechanism of the present invention;

[0036] Figure 5 This is a schematic cross-sectional view of the structure of the connecting frame, brush plate, and piston block in the present invention;

[0037] Figure 6 It is a structural schematic diagram of the second gear and the connecting shaft in the present invention.

[0038] Description of the numbers in the figure:

[0039] 1. Laminating box; 2. Mounting plate; 3. Motor; 4. Ultrasonic generator; 5. Connecting frame; 6. Magnetic strip; 7. Brush plate; 8. Concave mounting block; 9. Clamping block; 10. Oscillation mechanism; 11. Connecting block; 12. Spring wire; 13. Magnetic bead; 14. First gear; 15. Second gear; 16. Third gear; 17. Rotating ring; 18. Connecting shaft; 19. Piston block. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0043] Example 1:

[0044] See also Figure 1-6 , a method for preparing a graphene bonded copper wire, comprising the following steps:

[0045] S1. calcining the prepared copper rod and drawing it into a bonding copper wire of qualified size;

[0046] S2, annealing the drawn copper wire for later use;

[0047] S3, preparing a graphene solution, adding graphite flakes into a container, and adding an appropriate amount of ethanol solution and stirring;

[0048] S4. After standing for a period of time, pour off the ethanol solution and retain the lower sediment;

[0049] S5, adding appropriate amount of polyvinyl pyrrolidone and 1-methyl-2-pyrrolidone solution into the container;

[0050] S6. Place the prepared solution into an ultrasonic machine for ultrasonic treatment for a period of time;

[0051] S7, extracting the supernatant of the solution treated in S6, placing it in a centrifuge for centrifugation, and then obtaining a finished graphene solution;

[0052] S8. Install the annealed copper wire in a coating mechanism, add the graphene solution obtained in S7 into the coating mechanism, and start the coating mechanism to coat the copper wire.

[0053] S9, taking out the coated copper wire and performing oxidation-reduction on the graphene solution on the surface of the copper wire using a reducing agent;

[0054] S10, washing and drying the reduced copper wire to obtain a finished graphene-bonded copper wire.

[0055] The coating mechanism includes a coating box 1, and a mounting plate 2 is fixedly connected to one side of the outer wall of the coating box 1. A motor 3 and an ultrasonic generator 4 for ultrasonically oscillating the solution in the coating box 1 are installed on the mounting plate 2. The output shaft of the motor 3 is fixedly connected to the first gear 14, and the first gear 14 is meshed with the second gear 15. One side of the second gear 15 is fixedly connected to a connecting shaft 18, and the connecting shaft 18 passes through the coating box 1 and is rotatably connected to the coating box 1. A sealing ring is provided at the connecting shaft 18 and the coating box 1, and a first groove for plugging the copper wire is provided at the center of one end of the connecting shaft 18 located in the coating box 1. A rotating ring 17 is fixedly connected to the inner wall of the side of the coating box 1 away from the connecting shaft 18, and a second groove for clamping the copper wire is provided at the center of the rotating ring 17. The outer ring of the rotating ring 17 is rotatably connected to a clamping block 9, and the clamping block 9 is fixedly connected to the opposite side of the connecting shaft 18 with a connecting frame 5. A brush plate 7 is fixedly installed in the connecting frame 5 by bolts, and the brush plate 7 is close to Multiple groups of bristles are provided on one side of the copper wire. Through the setting of the ultrasonic generator 4, the graphene solution in the coating box 1 can be oscillated in real time, so that it is better distributed in the solution and combined with the surface of the copper wire. During this process, the output shaft of the motor 3 will also drive the first gear 14 to rotate, and the first gear 14 will drive the second gear 15 to rotate, and the rotation of the second gear 15 will drive the connecting shaft 18 to rotate, and finally drive the connecting frame 5 fixedly connected between the connecting shaft 18 and the clamping block 9 to rotate synchronously. During this process, one end of the copper wire is stably clamped in the first groove on the concave mounting block 8, and the other end is movably inserted in the second groove on the connecting shaft 18. As the connecting frame 5 rotates, the brush plate 7 can be driven to rotate, and the bristles and the continuous rotation around the copper wire are used to perform a rotational coating effect on the surface of the copper wire. Combined with ultrasonic oscillation, a double coating effect can be achieved, which greatly enhances the uniformity and coating efficiency of the coating on the surface of the copper wire.

[0056] A clamping block 9 that is compatible with the concave mounting block 8 and the rotating ring 17 is clamped in the groove of the rotating ring 17. By setting the clamping block 9, it is convenient to quickly disassemble and assemble the copper wire, and it is convenient for the copper wire to be clamped and limited in the first groove and the second groove, so that the bristles on the brush plate 7 can better coat the surface of the copper wire.

[0057] A cavity is provided in the brush plate 7, and a piston block 19 is slidably connected in the cavity. A plurality of third gears 16 are provided on one side of the brush bristles of the brush plate 7. The piston block 19 is made of heavy non-magnetic material. By slidingly connecting the piston block 19 in the cavity of the brush plate 7, it can be achieved that when the brush plate 7 rotates, as the direction of the brush plate 7 changes, the heavy piston block 19 will slide at the upper and lower extreme positions, and in the process of sliding up and down, the solution in the coating box 1 will be continuously sucked in, and sprayed out when the brush bristles are coating the copper wire, thereby increasing the content of graphene near the brush bristles and further improving the coating effect.

[0058] The bottom of the coating box 1 is fixedly installed with multiple oscillation mechanisms 10 for rolling up the sediment. The oscillation mechanism 10 includes a connecting block 11, which is screwed to the bottom of the inner wall of the coating box 1. The top of the connecting block 11 is fixedly connected to an elastic spring wire 12, and the top of the spring wire 12 is fixedly connected to a magnetic bead 13. The side of the brush plate 7 away from the bristles is fixedly connected to the magnetic strip 6. Through the magnetic attraction between the magnetic strip 6 and the magnetic beads 13, the connection frame 5 can carry the brush plate 7 to rotate, and then drive the magnetic strip 6 to rotate in the coating box 1. As the distance between the magnetic strip 6 and the multiple oscillation mechanisms 10 changes, the magnetic beads 13 at different positions are attracted to shake. In this process, the spring wire 12 undergoes stretching or compression, thereby achieving a reciprocating swinging effect, so that the graphene sediment precipitated in the coating box 1 is redistributed evenly in the solution, thereby improving the coating effect.

[0059] Working principle: When preparing the graphene bonding copper wire, first, the prepared copper rod needs to be processed into the bonding copper wire, and then the graphene solution is prepared. Then, the surface of the bonding copper wire is coated with a coating mechanism. After the coating is completed, the graphene film is oxidized and reduced with a reducing agent. Finally, it is washed and dried to obtain a dense and uniform graphene film bonding copper wire. When the coating mechanism is used, the prepared graphene solution is first poured into the coating box 1, and then the ultrasonic generator 4 and the motor 3 are started. The ultrasonic generator 4 performs high-frequency oscillation on the graphene solution in the coating box 4 to accelerate the solution. The movement of graphene makes it evenly distributed in the solution. At the same time, the output shaft of the motor 4 will drive the first gear 14 to rotate, and the first gear 14 will drive the second gear 15 to rotate, and the rotation of the second gear 15 will drive the connecting shaft 18 to rotate, and finally drive the connecting frame 5 fixedly connected between the connecting shaft 18 and the clamping block 9 to rotate synchronously. In this process, one end of the copper wire is stably clamped in the first groove on the concave mounting block 8, and the other end is movably inserted in the second groove on the connecting shaft 18. As the connecting frame 5 rotates, the brush plate 7 can be driven to rotate, and By utilizing the bristles and the action of continuously rotating around the copper wire, the surface of the copper wire is subjected to the effect of rotary coating, and in combination with ultrasonic oscillation, a double coating effect can be achieved, which greatly enhances the uniformity and coating efficiency of the copper wire surface coating. During this period, by sliding the piston block 19 connected to the cavity of the brush plate 7, it can be achieved that when the brush plate 7 rotates, as the direction of the brush plate 7 changes, at the upper and lower extreme positions, the heavy piston block 19 will slide, and in the process of sliding up and down, the solution in the coating box 1 will be continuously sucked in, and sprayed out when the brush bristles are coating the copper wire, thereby improving the bristles. The content of graphene nearby further improves the coating effect. At the same time, through the magnetic attraction between the magnetic stripe 6 and the magnetic beads 13, the brush plate 7 can be carried by the connecting frame 5 to rotate, and then the magnetic stripe 6 can be driven to rotate in the coating box 1. As the distance between the magnetic stripe 6 and the multiple oscillation mechanisms 10 changes, the magnetic beads 13 at different positions are attracted to shake. In this process, the spring wire 12 is stretched or compressed, thereby achieving a reciprocating swing effect, so that the graphene precipitates deposited in the coating box 1 are redistributed evenly in the solution, thereby improving the coating effect.

[0060] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A method for preparing a graphene-bonded copper wire, characterized in that: The following steps are involved: S1. calcining the prepared copper rod and drawing it into a bonding copper wire of qualified size; S2, annealing the drawn copper wire for later use; S3, preparing a graphene solution, adding graphite flakes into a container, and adding an appropriate amount of ethanol solution and stirring; S4. After standing for a period of time, pour off the ethanol solution and retain the lower sediment; S5, adding appropriate amount of polyvinyl pyrrolidone and 1-methyl-2-pyrrolidone solution into the container; S6. Place the prepared solution into an ultrasonic machine for ultrasonic treatment for a period of time; S7, extracting the supernatant of the solution treated in S6, placing it in a centrifuge for centrifugation, and then obtaining a finished graphene solution; S8, installing the annealed copper wire in a coating mechanism, adding the graphene solution obtained in S7 into the coating mechanism, and starting the coating mechanism to coat the copper wire; S9, taking out the coated copper wire and performing oxidation-reduction on the graphene solution on the surface of the copper wire using a reducing agent; S10, washing and drying the reduced copper wire to obtain a finished graphene-bonded copper wire; The coating mechanism includes a coating box (1), a mounting plate (2) is fixedly connected to one side of the outer wall of the coating box (1), a motor (3) and an ultrasonic generator (4) for ultrasonically oscillating the solution in the coating box (1) are installed on the mounting plate (2), an output shaft of the motor (3) is fixedly connected to a first gear (14), the first gear (14) is meshedly connected to a second gear (15), one side of the second gear (15) is fixedly connected to a connecting shaft (18), the connecting shaft (18) passes through the coating box (1) and is rotatably connected to the coating box (1), the connecting shaft (18) is connected to the coating box ( 1) is provided with a sealing ring, and a first groove for plugging the copper wire is provided at the center of one end of the connecting shaft (18) located in the coating box (1), a rotating ring (17) is fixedly connected to the inner wall of the coating box (1) away from the connecting shaft (18), and a second groove for clamping the copper wire is provided at the center of the rotating ring (17), the outer ring of the rotating ring (17) is rotatably connected to a clamping block (9), and the clamping block (9) and the opposite side of the connecting shaft (18) are fixedly connected to a connecting frame (5), a brush plate (7) is fixedly installed in the connecting frame (5) by bolts, and a plurality of groups of bristles are provided on the side of the brush plate (7) close to the copper wire.

2. The method for preparing a graphene bonding copper wire according to claim 1, wherein: The reducing agent is a mixture of one or more of hydrazine, hydroiodic acid and vitamin C.

3. The method for preparing a graphene bonding copper wire according to claim 1, wherein: The rotation speed of the centrifuge is 3500 rpm, and the centrifugation time is 10-30 min.

4. The method for preparing a graphene bonding copper wire according to claim 1, wherein: The usage of the 1-methyl-2-pyrrolidone solution is 50-80 ml.

5. The method for preparing a graphene bonding copper wire according to claim 1, wherein: The stirring time is 15 min, and the standing time is 20 min.

6. The method for preparing a graphene bonding copper wire according to claim 1, wherein: The ultrasound time of the ultrasound machine in S6 is 80-120 hours.

7. The method for preparing a graphene bonding copper wire according to claim 1, wherein: A clamping block (9) adapted to the concave mounting block (8) and the rotating ring (17) is clamped in the notch of the rotating ring (17).

8. The method for preparing a graphene bonding copper wire according to claim 1, wherein: A cavity is provided in the brush plate (7), and a piston block (19) is slidably connected in the cavity. A plurality of third gears (16) are provided on one side of the brush plate (7) located on the bristles. The piston block (19) is made of a heavy non-magnetic material.

9. The method for preparing a graphene bonding copper wire according to claim 1, wherein: A plurality of oscillation mechanisms (10) for rolling up sediments are fixedly installed at the bottom of the coating box (1), and the oscillation mechanisms (10) include a connecting block (11), the connecting block (11) is screwed to the bottom of the inner wall of the coating box (1), the top of the connecting block (11) is fixedly connected to an elastic spring wire (12), the top of the spring wire (12) is fixedly connected to a magnetic bead (13), and the side of the brush plate (7) away from the bristles is fixedly connected to a magnetic strip (6).

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