Low-resistance wear-resistant conductive silver paste and preparation method thereof

Abstract

The application belongs to the field of conductive silver paste, and particularly relates to a low-resistance wear-resistant conductive silver paste and a preparation method thereof. The preparation method is as follows: the silver paste of the application is a synergistic combination of flaky silver powder and nano silver material, the flaky silver powder forms a main conductive framework in the coating to ensure the basic conductive path, the nano silver material produces local fusion at the silver powder contact interface during solidification, effectively fills the micro pores, and significantly reduces the contact resistance between the particles. Ultra-fine hard ceramic particles subjected to surface treatment are additionally added, which are uniformly dispersed in the coating after solidification, bear and resist external force scratching. Meanwhile, solid lubricating materials with a layered crystal structure are introduced, which can form a transfer film on the contact surface during friction, convert sliding friction into low-resistance shearing between the layers, thereby reducing the wear rate from the root cause, and exhibiting excellent electrical stability and mechanical durability.

Description

Technical Field

[0001] This invention relates to the field of conductive silver paste technology, specifically to a low-resistance, wear-resistant conductive silver paste and its preparation method. Background Technology

[0002] Conductive pastes, especially silver-based conductive silver pastes, are key functional materials for forming circuits and electrodes in modern electronic devices. Their performance directly determines the reliability and lifespan of electronic products. Currently, as electronic devices continue to evolve towards flexibility, miniaturization, and high reliability, more stringent requirements are being placed on the overall performance of conductive silver pastes. They not only need excellent initial conductivity but also the ability to maintain stable electrical performance and physical integrity under complex mechanical stress and long-term use environments. Current technologies still face significant challenges in achieving this balance.

[0003] In pursuing high conductivity, traditional silver pastes typically rely on the dense packing of micron-sized silver powder to construct conductive pathways. However, the inherent contact resistance between silver powder particles and the unavoidable micropores within the cured coating become bottlenecks limiting further improvements in conductivity. These micro-defects generate localized hot spots when current flows through them and may deteriorate under environmental stress, causing the circuit resistance to slowly increase over time. An even more prominent contradiction lies in durability. Many applications, such as flexible connectors, rotating contacts, or wearable devices, require conductive coatings with excellent abrasion and scratch resistance. Existing technologies often add hard ceramic particles to the paste to enhance wear resistance, but this often comes at the cost of some conductivity. Furthermore, if the interfacial bonding between the hard particles and the organic binder phase is not properly handled, it can easily become a stress concentration point under repeated stress, leading to microcracks or even coating peeling, thus accelerating electrical failure.

[0004] Furthermore, traditional wear-resistant designs primarily focus on passively resisting wear, lacking active control over the friction interface, leading to rapid coating wear during long-term sliding friction. From a manufacturing process perspective, many high-performance pastes employ complex resin systems or additives to achieve specific functions, often making post-printing screen and tool cleaning difficult and requiring the use of multiple or strong solvents, increasing production complexity and cost. Therefore, developing a conductive silver paste that simultaneously achieves low resistance, high wear resistance, and good processability has become a key direction for overcoming current technological bottlenecks and meeting the needs of next-generation electronic manufacturing. Summary of the Invention

[0005] The purpose of this invention is to provide a low-resistance, wear-resistant conductive silver paste and its preparation method, so as to solve the problem that conductive silver pastes in the prior art are difficult to achieve both low contact resistance and high wear resistance.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a low-resistance, wear-resistant, conductive silver paste, wherein the silver paste is prepared by a synergistic combination of flake silver powder and nano-silver materials, adding surface-treated ultrafine hard ceramic particles, and introducing a solid lubricating material with a layered crystal structure.

[0007] Furthermore, a method for preparing a low-resistance, wear-resistant, conductive silver paste includes the following preparation steps: (1) Weigh 60g of flake silver powder with a particle size distribution of 3-5μm; weigh 5g of silver nanowires with a diameter of 50nm and a length of 10-20μm; place 5-8g of alumina nanoparticles with an average particle size of 30nm in 100mL of ethanol, add 0.5g of silane coupling agent, and ultrasonically disperse in a 65℃ water bath for 30min. After surface modification, centrifuge and separate the solid. Place the obtained solid in a 60℃ vacuum drying oven and dry for 4h to ensure complete removal of ethanol residue, and obtain pretreated and dried alumina nanoparticles; add 1g of graphene powder to 20mL of solvent containing 0.1g of dispersant, and ultrasonically treat for 1h to obtain a stable dispersed graphene slurry; (2) Add 12g terpineol and 2-3g diethylene glycol butyl ether acetate as a mixed solvent to a mixing container, preheat to 50°C, then add 12-16g epoxy resin and 1.2-2.0g latent curing agent, and stir continuously at 300rpm for 30min until the resin is completely dissolved and the solution is homogeneous and transparent; after the solution cools to below 40°C, add 0.5g leveling agent BYK-333 and 0.3g defoamer BYK-052, and continue stirring for 35min to obtain the modified resin solution; (3) Add the pretreated and dried nano-alumina powder and graphene slurry to the modified resin solution, increase the stirring speed to 2500 rpm, and continue to disperse for 45 min to obtain a uniform premixed slurry; then adjust the speed to 1200 rpm and slowly and in batches add the nano-silver wires; after ensuring that they are uniformly dispersed and free from entanglement, add the flake silver powder; after all the materials are added, turn on the vacuum system, reduce the pressure inside the container to -0.09 MPa, and stir at a slow speed of 500 rpm for 2 h; during this period, briefly introduce dry air to break the vacuum and then evacuate the vacuum twice to help the deep-seated bubbles escape, and finally obtain the conductive silver paste.

[0008] Furthermore, the silane coupling agent in step (1) is KH-550.

[0009] Furthermore, the dispersant in step (1) is BYK-2150.

[0010] Furthermore, the solvent in step (1) is diethylene glycol butyl ether acetate.

[0011] Furthermore, the leveling agent in step (2) is BYK-333.

[0012] Furthermore, the defoamer in step (2) is BYK-052.

[0013] Furthermore, in step (2), the epoxy resin is bisphenol A epoxy resin and the latent curing agent is dicyandiamide curing agent.

[0014] Furthermore, in step (3), the batch addition is carried out by adding the first batch of silver nanowires while the premixed slurry is being stirred. The mixture is stirred for 3-5 minutes until it is basically evenly dispersed, and then the next batch is added, and so on, until all the nanowires are added.

[0015] Furthermore, in step (3), the total amount is divided into three equal parts.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: The silver paste of this invention employs a synergistic combination of flake silver powder and nano-silver materials. The flake silver powder forms the main conductive framework in the coating, ensuring the basic conductive pathway. During the subsequent curing process, the nano-silver materials, through surface activity, achieve local fusion at the silver powder contact interface, effectively filling micropores and significantly reducing the contact resistance between particles, thus maintaining the overall resistivity of the coating at a low level. While ensuring performance, process convenience is also considered. Its organic carrier system is carefully designed so that after screen printing or coating, the relevant production tools only require routine cleaning with a common alcohol ether solvent to restore cleanliness, simplifying the maintenance process.

[0017] This invention adds surface-treated ultrafine hard ceramic particles, which, after curing, are uniformly dispersed in the coating to withstand and resist external scratches. Simultaneously, a solid lubricant material with a layered crystal structure is introduced. This type of material can form a transfer film at the contact surface during friction, converting sliding friction into low-resistance shear between its layers, thereby reducing the wear rate at its source. This allows the coating to maintain complete conductive pathways even after long-term friction testing. The coating exhibits excellent adhesion on various substrates. After repeated friction or sliding tests, the change in its circuit resistance is significantly smaller than that of conventional products, demonstrating excellent electrical stability and mechanical durability. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The testing methods for various indicators of a low-resistance, wear-resistant, conductive silver paste prepared in the following embodiments are as follows: Curing Process: Conductive silver paste is screen-printed onto a polyimide film substrate that has undergone plasma surface treatment or ethanol cleaning, with a wet film thickness of 25 μm. The printed substrate is then placed in an oven for a stepped curing process, all conducted in an air atmosphere. First, the substrate is allowed to stand at 80°C for 15 minutes to allow most of the solvent to evaporate. Then, the temperature is increased to 130°C at a rate of 3°C / min and held for 40 minutes to allow the resin to initially crosslink. Finally, the temperature is increased to 180°C at a rate of 2°C / min and heat-treated for 45 minutes to promote complete resin curing and achieve full fusion of the silver particle interfaces. The curing process is carried out under normal pressure. After curing, the coating is allowed to cool naturally. Used printing screens and agitator blades can be immediately immersed in a sufficient amount of diethylene glycol butyl ether acetate solvent for cleaning. After soaking at room temperature for 15 minutes, the substrate can be gently brushed with a soft brush to completely remove any residual paste.

[0020] Conductivity: The conductivity of the cured silver paste was tested using a four-probe resistance meter.

[0021] Adhesion testing method: The prepared conductive silver paste is printed on ITO glass and ITO film, dried and cured, and then subjected to a cross-cut adhesion test.

[0022] The following examples and comparative examples were all tested using this curing process.

[0023] Example 1

[0024] (1) Weigh 60g of flake silver powder with a particle size distribution of 3μm; weigh 5g of silver nanowires with a diameter of 50nm and a length of 10μm; place 5g of nano-alumina powder with an average particle size of 30nm in 100mL of ethanol, add 0.5g of silane coupling agent KH-550 (γ-aminopropyltriethoxysilane), and ultrasonically disperse in a 65℃ water bath for 30min. After completing the surface modification, centrifuge and separate the solid. Place the obtained solid in a 60℃ vacuum drying oven and dry for 4h to ensure complete removal of ethanol residue, and obtain pretreated and dried nano-alumina powder; add 1g of graphene powder to 20mL of diethylene glycol butyl ether acetate containing 0.1g of dispersant BYK-2150 (block copolymer solution with alkaline pigment affinity group), and ultrasonically treat for 1h to obtain a stable dispersed graphene slurry; (2) Add 12g terpineol and 2g diethylene glycol butyl ether acetate to a mixing container as a mixed solvent, preheat to 50°C, then add 12g bisphenol A epoxy resin and 1.2g dicyandiamide, and stir continuously at 300rpm for 30min until the resin is completely dissolved and the solution is homogeneous and transparent; after the solution cools to below 40°C, add 0.5g leveling agent BYK-333 (polyether modified polydimethylsiloxane) and 0.3g defoamer BYK-052 (silicone-free polymeric defoamer), and continue stirring for 35min to obtain the modified resin solution; (3) Add the pretreated and dried nano-alumina powder and graphene slurry to the modified resin solution, increase the stirring speed to 2500 rpm, and continue to disperse for 45 min to obtain a uniform premixed slurry; then adjust the speed to 1200 rpm, slowly and in batches add the nano-silver wires, divide the total amount into 3 equal parts, add the first part of nano-silver wires while the premixed slurry is being stirred, and continue stirring for 3 min. After it is basically dispersed evenly, add the next part, and so on, until all are added; after ensuring that it is evenly dispersed and free from entanglement, add the flake silver powder; after all the materials are added, turn on the vacuum system, reduce the pressure inside the container to -0.09 MPa, and stir at a slow speed of 500 rpm for 2 h; during this period, briefly introduce dry air to break the vacuum and then evacuate the vacuum twice to help the deep-seated bubbles escape, and finally obtain conductive silver paste.

[0025] Example 2

[0026] (1) Weigh 60g of flake silver powder with a particle size distribution of 4μm; weigh 5g of silver nanowires with a diameter of 50nm and a length of 15μm; place 6.5g of nano-alumina powder with an average particle size of 30nm in 100mL of ethanol, add 0.5g of silane coupling agent KH-550, and ultrasonically disperse in a water bath at 65℃ for 30min. After surface modification, centrifuge and separate the solid. Place the obtained solid in a vacuum drying oven at 60℃ for 4h to ensure complete removal of ethanol residue and obtain pretreated and dried nano-alumina powder; add 1g of graphene powder to 20mL of diethylene glycol butyl ether acetate containing 0.1g of dispersant BYK-2150, and ultrasonically treat for 1h to obtain a stable dispersed graphene slurry; (2) Add 12g terpineol and 2.5g diethylene glycol butyl ether acetate to a mixing container as a mixed solvent, preheat to 50°C, then add 14g bisphenol A epoxy resin and 1.6g dicyandiamide, and stir continuously at 300rpm for 30min until the resin is completely dissolved and the solution is homogeneous and transparent; after the solution cools to below 40°C, add 0.5g leveling agent BYK-333 and 0.3g defoamer BYK-052, and continue stirring for 35min to obtain the modified resin solution; (3) Add the pretreated and dried nano-alumina powder and graphene slurry to the modified resin solution, increase the stirring speed to 2500 rpm, and continue to disperse for 45 min to obtain a uniform premixed slurry; then adjust the speed to 1200 rpm, slowly and in batches add the nano-silver wires, divide the total amount into 3 equal parts, add the first part of nano-silver wires while the premixed slurry is being stirred, and continue stirring for 4 min. After it is basically dispersed evenly, add the next part, and so on, until all are added; after ensuring that it is evenly dispersed and free from entanglement, add the flake silver powder; after all the materials are added, turn on the vacuum system, reduce the pressure inside the container to -0.09 MPa, and stir at a slow speed of 500 rpm for 2 h; during this period, briefly introduce dry air to break the vacuum and then evacuate the vacuum twice to help the deep-seated bubbles escape, and finally obtain conductive silver paste.

[0027] Example 3

[0028] (1) Weigh 60g of flake silver powder with a particle size distribution of 5μm; weigh 5g of silver nanowires with a diameter of 50nm and a length of 20μm; place 8g of nano-alumina powder with an average particle size of 30nm in 100mL of ethanol, add 0.5g of silane coupling agent KH-550, and ultrasonically disperse in a water bath at 65℃ for 30min. After surface modification, centrifuge and separate the solid. Place the obtained solid in a vacuum drying oven at 60℃ for 4h to ensure complete removal of ethanol residue and obtain pretreated and dried nano-alumina powder; add 1g of graphene powder to 20mL of diethylene glycol butyl ether acetate containing 0.1g of dispersant BYK-2150, and ultrasonically treat for 1h to obtain a stable dispersed graphene slurry; (2) Add 12g terpineol and 3g diethylene glycol butyl ether acetate to a mixing container as a mixed solvent, preheat to 50°C, then add 16g bisphenol A epoxy resin and 2.0g dicyandiamide, and stir continuously at 300rpm for 30min until the resin is completely dissolved and the solution is homogeneous and transparent; after the solution cools to below 40°C, add 0.5g leveling agent BYK-333 and 0.3g defoamer BYK-052, and continue stirring for 35min to obtain the modified resin solution; (3) Add the pretreated and dried nano-alumina powder and graphene slurry to the modified resin solution, increase the stirring speed to 2500 rpm, and continue to disperse for 45 min to obtain a uniform premixed slurry; then adjust the speed to 1200 rpm, slowly and in batches add the nano-silver wires, divide the total amount into 3 equal parts, add the first part of nano-silver wires while the premixed slurry is being stirred, and continue stirring for 5 min. After it is basically dispersed evenly, add the next part, and so on, until all are added; after ensuring that it is evenly dispersed and free from entanglement, add the flake silver powder; after all the materials are added, turn on the vacuum system, reduce the pressure inside the container to -0.09 MPa, and stir at a slow speed of 500 rpm for 2 h; during this period, briefly introduce dry air to break the vacuum and then evacuate the vacuum twice to help the deep-seated bubbles escape, and finally obtain conductive silver paste.

[0029] Comparative Example 1 The difference between Comparative Example 1 and Example 2 lies in the difference between steps (1) and (3). Steps (1) and (3) are changed to: (1) Weigh 60g of flake silver powder with a particle size distribution of 4μm; place 6.5g of nano alumina powder with an average particle size of 30nm in 100mL of ethanol, add 0.5g of silane coupling agent KH-550, and ultrasonically disperse in a 65℃ water bath for 30min. After completing the surface modification, centrifuge and separate the solid. Place the obtained solid in a 60℃ vacuum drying oven and dry for 4h to ensure complete removal of ethanol residue and obtain pretreated and dried nano alumina powder; add 1g of graphene powder to 20mL of diethylene glycol butyl ether acetate containing 0.1g of dispersant BYK-2150, and ultrasonically treat for 1h to obtain a stable dispersed graphene slurry; (3) Add the pretreated and dried nano-alumina powder and graphene slurry to the modified resin solution, increase the stirring speed to 2500 rpm, and continue to disperse for 45 min to obtain a uniform premixed slurry; then add flake silver powder; after all the materials are added, turn on the vacuum system, reduce the pressure inside the container to -0.09 MPa, and stir at a slow speed of 500 rpm for 2 h; during this period, briefly introduce dry air to break the vacuum and then evacuate the vacuum twice to help the deep-seated bubbles escape, and finally obtain conductive silver paste; the remaining steps are the same as in Example 2.

[0030] Comparative Example 2 The difference between Comparative Example 2 and Example 2 lies in the difference between steps (1) and (3). Steps (1) and (3) are changed to: (1) Weigh 60g of flake silver powder with a particle size distribution of 4μm; weigh 5g of silver nanowires with a diameter of 50nm and a length of 15μm; add 1g of graphene powder to 20mL of diethylene glycol butyl ether acetate containing 0.1g of dispersant BYK-2150, and sonicate for 1h to obtain a stable dispersed graphene slurry; (3) Add graphene slurry to modified resin solution, increase the stirring speed to 2500 rpm, and continue to disperse for 45 min to obtain uniform premixed slurry; then adjust the speed to 1200 rpm, slowly and in batches add silver nanowires, divide the total amount into 3 equal parts, add the first part of silver nanowires while the premixed slurry is being stirred, and continue stirring for 4 min. After it is basically dispersed evenly, add the next part, and so on, until all is added; after ensuring that it is evenly dispersed and free from entanglement, add flake silver powder; after all the materials are added, turn on the vacuum system, reduce the pressure inside the container to -0.09 MPa, and stir at a slow speed of 500 rpm for 2 h; during this period, briefly introduce dry air to break the vacuum and then evacuate the vacuum twice to help the deep-seated bubbles escape, and finally obtain conductive silver paste; the remaining steps are the same as in Example 2.

[0031] Comparative Example 3 The difference between Comparative Example 3 and Example 2 lies in the difference between steps (1) and (3). Steps (1) and (3) are changed to: (1) Weigh 60g of flake silver powder with a particle size distribution of 4μm; weigh 5g of silver nanowires with a diameter of 50nm and a length of 15μm; place 6.5g of nano-alumina powder with an average particle size of 30nm in 100mL of ethanol, add 0.5g of silane coupling agent KH-550, and ultrasonically disperse in a water bath at 65℃ for 30min. After completing the surface modification, centrifuge and separate the solid. Place the obtained solid in a vacuum drying oven at 60℃ and dry for 4h to ensure that the ethanol residue is completely removed, and obtain the pretreated and dried nano-alumina powder. (3) Add the pretreated and dried nano-alumina powder to the modified resin solution, increase the stirring speed to 2500 rpm, and continue to disperse for 45 min to obtain a uniform premixed slurry; then adjust the speed to 1200 rpm, slowly and in batches add the nano-silver wires, divide the total amount into 3 equal parts, add the first part of nano-silver wires while the premixed slurry is being stirred, and continue stirring for 4 min. After it is basically dispersed evenly, add the next part, and so on, until all are added; after ensuring that it is evenly dispersed and free from entanglement, add the flake silver powder; after all the materials are added, turn on the vacuum system, reduce the pressure inside the container to -0.09 MPa, and stir at a slow speed of 500 rpm for 2 h; during this period, briefly introduce dry air to break the vacuum and then evacuate the vacuum twice again to help the deep-seated air bubbles escape, and finally obtain conductive silver paste; the remaining steps are the same as in Example 2.

[0032] Example of effect Table 1 below presents the performance analysis results of a low-resistance wear-resistant conductive silver paste using Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention.

[0033] Table 1

[0034] A comparison of the volume resistivity experimental data of the embodiments and comparative examples reveals that the present invention achieves a significant reduction in the overall resistivity of the coating through the synergistic combination of flake silver powder and nano-silver materials. A comparison of the wear resistance and coefficient of friction experimental data of the embodiments and comparative examples reveals that the present invention, by simultaneously introducing ultrafine hard ceramic particles and layered solid lubricating materials, achieves a synergistic effect in improving the mechanical durability of the coating and reducing frictional loss. A comparison of the adhesion experimental data of the embodiments and comparative examples reveals that the present invention, through an optimized organic carrier system and surface treatment of the inorganic filler, achieves a firmly bonded coating on various substrates. All embodiments achieved a cross-cut adhesion test result of grade 0 or 1, demonstrating excellent adhesion, proving that the surface-treated hard ceramic particles not only enhance wear resistance, but their good interfacial bonding with the resin matrix also clearly contributes to improving the overall adhesion of the coating.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A low-resistance, wear-resistant, conductive silver paste, characterized in that, The silver paste is prepared by combining flake silver powder and nano-silver materials, adding surface-treated ultrafine hard ceramic particles, and introducing a solid lubricating material with a layered crystal structure.

2. A method for preparing a low-resistance, wear-resistant, conductive silver paste, characterized in that, The preparation steps include the following: (1) Weigh 60g of flake silver powder with a particle size distribution of 3-5μm; weigh 5g of silver nanowires with a diameter of 50nm and a length of 10-20μm; place 5-8g of alumina nanoparticles with an average particle size of 30nm in 100mL of ethanol, add 0.5g of silane coupling agent, and ultrasonically disperse in a 65℃ water bath for 30min. After surface modification, centrifuge and separate the solid. Place the obtained solid in a 60℃ vacuum drying oven and dry for 4h to ensure complete removal of ethanol residue, and obtain pretreated and dried alumina nanoparticles; add 1g of graphene powder to 20mL of solvent containing 0.1g of dispersant, and ultrasonically treat for 1h to obtain a stable dispersed graphene slurry; (2) Add 12g terpineol and 2-3g diethylene glycol butyl ether acetate as a mixed solvent to a mixing container, preheat to 50°C, then add 12-16g epoxy resin and 1.2-2.0g latent curing agent, and stir continuously at 300rpm for 30min until the resin is completely dissolved and the solution is homogeneous and transparent; after the solution cools to below 40°C, add 0.5g leveling agent BYK-333 and 0.3g defoamer BYK-052, and continue stirring for 35min to obtain the modified resin solution; (3) Add the pretreated and dried nano-alumina powder and graphene slurry to the modified resin solution, increase the stirring speed to 2500 rpm, and continue to disperse for 45 min to obtain a uniform premixed slurry; then adjust the speed to 1200 rpm and slowly and in batches add the nano-silver wires; after ensuring that they are uniformly dispersed and free from entanglement, add the flake silver powder; after all the materials are added, turn on the vacuum system, reduce the pressure inside the container to -0.09 MPa, and stir at a slow speed of 500 rpm for 2 h; during this period, briefly introduce dry air to break the vacuum and then evacuate the vacuum twice to help the deep-seated bubbles escape, and finally obtain the conductive silver paste.

3. The method for preparing a low-resistance, wear-resistant, conductive silver paste according to claim 2, characterized in that, The silane coupling agent in step (1) is KH-550.

4. The method for preparing a low-resistance, wear-resistant, conductive silver paste according to claim 2, characterized in that, The dispersant in step (1) is BYK-2150.

5. The method for preparing a low-resistance, wear-resistant, conductive silver paste according to claim 2, characterized in that, The solvent in step (1) is diethylene glycol butyl ether acetate.

6. The method for preparing a low-resistance, wear-resistant, conductive silver paste according to claim 2, characterized in that, The leveling agent used in step (2) is BYK-333.

7. The method for preparing a low-resistance, wear-resistant, conductive silver paste according to claim 2, characterized in that, The defoamer used in step (2) is BYK-052.

8. The method for preparing a low-resistance, wear-resistant, conductive silver paste according to claim 2, characterized in that, In step (2), the epoxy resin is bisphenol A epoxy resin and the latent curing agent is dicyandiamide.

9. The method for preparing a low-resistance, wear-resistant, conductive silver paste according to claim 2, characterized in that, In step (3), the first batch of nano-silver wires is added while the premixed slurry is being stirred. The mixture is stirred for 3-5 minutes until it is basically evenly dispersed. Then the next batch is added, and so on, until all the wires are added.

10. The method for preparing a low-resistance, wear-resistant, conductive silver paste according to claim 2, characterized in that, In step (3), the batching process involves dividing the total amount into three equal parts.

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