Ultraviolet curing conductive paste and preparation method thereof

Abstract

The invention discloses an ultraviolet curing conductive paste, and relates to the technical field of electronic tag printing materials, and the ultraviolet curing conductive paste is prepared from the following materials in parts: 10-500 parts of an ultraviolet initiator, 100-600 parts of photosensitive resin, 10-700 parts of a conductive filler, 100-200 parts of carbon nanotubes, 1-200 parts of graphene, 10-340 parts of an auxiliary agent and 20-300 parts of a reactive diluent. The invention further discloses a preparation method of the ultraviolet curing conductive paste. Through research and development of a novel conductive paste formula and addition of the ultraviolet initiator and the photosensitive resin, rapid curing is realized, the production efficiency is improved, the ultraviolet initiator is utilized to initiate a curing reaction of the photosensitive resin under ultraviolet irradiation, the drying temperature is reduced, the drying time is shortened, the printability of the conductive paste is optimized, and the production cost is reduced. Uniform and stable printing effects can be realized on different base materials, and a better use prospect is brought.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic tag printing materials, and particularly to an ultraviolet-curable conductive paste and a preparation method thereof. Background Art

[0002] Under the background of the rapid development of the modern electronic information industry, various electronic products are constantly moving towards miniaturization, light weight, and high performance, which puts extremely strict requirements on the performance of electronic components and related materials. As an indispensable key material in the electronic field, conductive paste is widely used in the manufacturing processes of printed circuit boards, electronic tags, sensors and many other products. Its performance directly affects the quality and performance of products. Traditional conductive pastes, such as thermosetting conductive pastes, require high temperatures and long times during the curing process. This not only increases production costs but also limits their application on some temperature-sensitive substrates. For thermosensitive plastic films, high-temperature curing may cause film deformation and performance deterioration, unable to meet the high-precision manufacturing requirements of products. At the same time, the long curing time also reduces production efficiency and is difficult to adapt to the rhythm of large-scale industrial production; Traditional conductive pastes also have deficiencies in printing suitability on different substrates. When applied to substrates of various materials such as paper, plastic films, and silk fabrics, it is difficult to ensure uniform and stable printing effects on various substrates, resulting in unstable printing quality and a high rejection rate. It cannot be effectively cured quickly, and the drying temperature and time of printed RFID electronic tags are slow, reducing production efficiency. In response to this, we propose an ultraviolet-curable conductive paste and a preparation method thereof. Summary of the Invention

[0003] To solve the above technical problems, an ultraviolet-curable conductive paste and a preparation method thereof are provided. This technical solution solves the problems of unable to cure quickly and reducing production efficiency mentioned above.

[0004] To achieve the above object, the technical solution adopted by the present invention is: an ultraviolet-curable conductive paste is prepared from the following parts by weight of materials, including: 10 - 500 parts of an ultraviolet initiator, 100 - 600 parts of a photosensitive resin, 10 - 700 parts of a conductive filler, 100 - 200 parts of carbon nanotubes, 1 - 200 parts of graphene, 10 - 340 parts of an auxiliary agent, and 20 - 300 parts of an active diluent.

[0005] Preferably, it is specifically prepared from the following parts by weight of materials: 220 parts of an ultraviolet initiator, 110 parts of a photosensitive resin, 500 parts of a conductive filler, 120 parts of carbon nanotubes, 90 parts of graphene, 210 parts of an auxiliary agent, and 90 parts of an active diluent.

[0006] Preferably, the ultraviolet initiator is one of benzoin ethyl ether, acetophenone, acylphosphine oxides, hydrogen abstraction type photoinitiators and cleavage type photoinitiators; the photosensitive resin is one of epoxy acrylate, polyurethane acrylate and alicyclic epoxy resin photosensitive resin; and the conductive filler is one of precious metals, base metals, graphite and carbon black.

[0007] Preferably, the carbon nanotubes are one of single-walled carbon nanotubes and multi-walled carbon nanotubes, and the graphene is one of single-layer graphene, bilayer graphene, few-layer graphene and multi-layer graphene.

[0008] Preferably, the additives include plasticizers, stabilizers, fillers, flame retardants, dispersants and leveling agents, and the reactive diluent is one of monofunctional acrylate and polyfunctional acrylate.

[0009] A preparation method of an ultraviolet curable conductive paste, and the preparation steps are as follows: S1. Prepare materials, including: 10-500 parts of ultraviolet initiator, 100-600 parts of photosensitive resin, 10-700 parts of conductive filler, 100-200 parts of carbon nanotubes, 1-200 parts of graphene, 10-340 parts of additives and 20-300 parts of reactive diluent; S2. Disperse the conductive filler, carbon nanotubes and graphene. Add the weighed conductive filler, carbon nanotubes and graphene into a solvent, and disperse them based on a high-speed stirrer to form a stable mixed dispersion; S3. Add the reactive diluent. Under continuous stirring, slowly add the weighed reactive diluent into the mixed dispersion, and continue stirring for 30 min; S4. Add the additives. Gradually add the additives into the mixed solution, and continue stirring for 30-60 min; S5. Mix the photosensitive resin. Slowly add the weighed photosensitive resin into the mixed solution, and use a low-speed stirrer to stir for 1-2 h to mix evenly; S6. Add the ultraviolet initiator. Add the ultraviolet initiator into the mixed system, and stir for 30 min to ensure that the ultraviolet initiator is dispersed in the paste; S7. Filter and quality inspection. Filter the prepared ultraviolet curable conductive paste through a filter screen to remove existing agglomerated particles or impurities, and conduct quality inspection on the prepared conductive paste; after passing the inspection, package it in a light-proof and sealed container.

[0010] Preferably, in step S2, the rotation speed of the high-speed stirrer is 3000-5000 r / min. Based on the shear force generated by high-speed rotation, the materials are dispersed, the stirring time is 2-4 h, and the stirring is paused every 30 min to observe the stirring effect.

[0011] Preferably, after the preparation of the mixed dispersion liquid in step S3, start the low-speed stirring equipment, set the stirring speed at 100 - 200 r / min, use a graduated separating funnel, weigh the reactive diluent according to the formula and add it to the mixed dispersion liquid, control the dropping speed of the reactive diluent, and keep the dropping speed uniform at 2 - 3 drops per second. After all the reactive diluent is added, continue to maintain the current stirring speed and stir continuously for 30 min, and control the ambient temperature at 25°C ± 2°C.

[0012] Preferably, during the addition of the auxiliary agent in step S4, adjust the rotation speed to 80 - 120 r / min.

[0013] Preferably, the quality inspection methods in step S7 include conductivity detection, curing performance detection and curing efficiency.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By researching and developing a new type of conductive paste formula and adding a photoinitiator and a photosensitive resin, the present invention realizes rapid curing, improves production efficiency, uses the photoinitiator to initiate the curing reaction of the photosensitive resin under ultraviolet light irradiation, reduces the drying temperature and time, optimizes the printing suitability of the conductive paste, and ensures uniform and stable printing effects on different substrates, bringing better application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of the preparation steps of the invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations.

[0017] Refer to Figure 1 As shown, a UV-curable conductive paste is prepared from the following parts by weight of materials, including: 10 - 500 parts of photoinitiator, 100 - 600 parts of photosensitive resin, 10 - 700 parts of conductive filler, 100 - 200 parts of carbon nanotubes, 1 - 200 parts of graphene, 10 - 340 parts of auxiliary agent and 20 - 300 parts of reactive diluent.

[0018] Specifically, it is prepared from the following parts by weight of materials: 220 parts of photoinitiator, 110 parts of photosensitive resin, 500 parts of conductive filler, 120 parts of carbon nanotubes, 90 parts of graphene, 210 parts of auxiliary agent and 90 parts of reactive diluent.

[0019] The ultraviolet initiator in this application is a key component for achieving ultraviolet curing. It can rapidly generate a sufficient number of active free radicals or cations under ultraviolet irradiation, initiate the polymerization reaction of the photosensitive resin, and enable the slurry to complete curing in a short time, greatly improving production efficiency. An appropriate addition amount can ensure uniform curing of the slurry throughout the system, avoiding phenomena such as incomplete local curing or over-curing, thereby ensuring the consistency and stability of the properties of the cured slurry. The photosensitive resin is the basic substance for forming a solid film layer after the slurry is cured. During the curing process, the photosensitive resin undergoes a cross-linking reaction to form a three-dimensional network structure, providing good mechanical properties and physical stability for the slurry. An appropriate amount of photosensitive resin can be well mixed and compatible with conductive fillers, carbon nanotubes, and graphene, enabling these conductive components to be uniformly dispersed in the resin matrix. The conductive filler is the main component that endows the slurry with conductivity, enabling electrons to conduct smoothly in the slurry and meeting the requirements of electronic devices for conductive performance. The conductive filler can also play a role in enhancing the mechanical properties of the material, and cooperate with the photosensitive resin to improve the hardness, wear resistance, and impact resistance of the cured slurry. Carbon nanotubes have excellent electrical properties, and their unique one-dimensional nanostructure can form an efficient conductive network, which cooperates with the conductive filler to further improve the conductivity and current-carrying capacity of the slurry. The two-dimensional sheet structure of graphene can improve the flexibility of the slurry to a certain extent, enabling the cured coating to still maintain good conductive performance when bent or deformed. The dispersant in the additives can evenly disperse the conductive filler, carbon nanotubes, and graphene in the slurry, prevent them from agglomerating, and ensure the uniform and stable conductive performance of the slurry. The leveling agent and defoaming agent can improve the fluidity, leveling property, and defoaming performance of the slurry, enabling the slurry to evenly cover the surface of the substrate during the printing process, avoiding defects such as sagging and bubbles, and improving the printing quality. The adhesion promoter can improve the adhesion between the slurry and the substrate, ensure that the cured conductive layer firmly adheres to the substrate and is not easily detached, and improve the service life and reliability of the product.

[0020] The ultraviolet initiator is one of benzoin ethyl ether, acetophenone, acylphosphine oxides, hydrogen abstraction type photoinitiators, and cleavage type photoinitiators; the photosensitive resin is one of epoxy acrylate, polyurethane acrylate, and alicyclic epoxy resin photosensitive resin; the conductive filler is one of noble metals, base metals, graphite, and carbon black.

[0021] The carbon nanotube is one of single-walled carbon nanotubes and multi-walled carbon nanotubes, and the graphene is one of single-layer graphene, bilayer graphene, few-layer graphene, and multi-layer graphene.

[0022] The additives include plasticizers, stabilizers, fillers, flame retardants, dispersants, and leveling agents, and the active diluent is one of monofunctional acrylate and polyfunctional acrylate.

[0023] A preparation method of an ultraviolet-curable conductive paste, and the preparation steps are as follows: S1. Prepare materials, including: 10 - 500 parts of an ultraviolet initiator, 100 - 600 parts of a photosensitive resin, 10 - 700 parts of a conductive filler, 100 - 200 parts of carbon nanotubes, 1 - 200 parts of graphene, 10 - 340 parts of an auxiliary agent, and 20 - 300 parts of an active diluent; S2. Disperse the conductive filler, carbon nanotubes, and graphene. Add the weighed conductive filler, carbon nanotubes, and graphene into a solvent, and disperse them based on a high-speed mixer to form a stable mixed dispersion liquid; S3. Add the active diluent. Under continuous stirring, slowly add the weighed active diluent into the mixed dispersion liquid, and continue stirring for 30 min; S4. Add the auxiliary agent. Gradually add the auxiliary agent into the mixed liquid, and continue stirring for 30 - 60 min; S5. Mix the photosensitive resin. Slowly add the weighed photosensitive resin into the mixed liquid, and use a low-speed stirrer to stir for 1 - 2 h to mix evenly; S6. Add the ultraviolet initiator. Add the ultraviolet initiator into the mixed system, and stir for 30 min to ensure that the ultraviolet initiator is dispersed in the paste; S7. Filter and quality inspection. Filter the prepared ultraviolet-curable conductive paste through a filter screen to remove existing agglomerated particles or impurities, and conduct a quality inspection on the prepared conductive paste; after passing the inspection, package it in a light-proof and sealed container.

[0024] In step S1 of the present application, a variety of materials are prepared and a wide dosage range is set, which can flexibly adjust the formulation ratio according to different application requirements and performance emphases. For example, in scenarios with extremely high requirements for conductivity, the proportion of the conductive filler, carbon nanotubes, and graphene can be appropriately increased; if better curing effect and flexibility are required, the dosages of the photosensitive resin and the active diluent are adjusted to diversify the paste performance and meet the needs of manufacturing different electronic components and products; In step S2, a high-speed mixer is used to disperse the conductive filler, carbon nanotubes, and graphene, which can break the agglomeration between materials by means of the strong shear force generated by high-speed rotation, make them evenly distributed in the solvent, and form a stable mixed dispersion liquid. This can ensure that the conductive performance of the subsequently prepared paste is uniform and stable, and avoid large local conductive performance differences caused by uneven distribution of conductive components, affecting the product quality; In steps S3 and S5, the reactive diluent and the photosensitive resin are slowly added and continuously stirred. The reactive diluent can sufficiently reduce the viscosity of the mixed dispersion under gentle stirring, improve the processing performance, and at the same time be uniformly dispersed in the system, providing good conditions for the subsequent curing reaction. The photosensitive resin is slowly added and stirred at a low speed, which can avoid the generation of bubbles and agglomeration due to too fast addition speed or too strong stirring, ensure its full mixing with other components, and make the cured slurry have good mechanical properties and physical stability. In step S4, the additives are gradually added and stirred for 30 - 60 minutes, which can enable additives with different functions, such as dispersants, leveling agents, and defoamers, to fully play their respective roles. The dispersant further optimizes the dispersion effect of the conductive components, and the leveling agent and defoamer improve the printing suitability of the slurry, so that when the slurry is printed or coated subsequently, it can evenly cover the surface of the substrate, avoid defects such as sagging and bubbles, and improve the product quality. In step S6, the ultraviolet initiator is added last and stirred for 30 minutes, which can avoid its premature decomposition or inactivation due to long-term exposure or being affected by other components and environmental factors during the previous preparation process, ensure that the ultraviolet initiator can effectively initiate the curing reaction of the photosensitive resin when irradiated by ultraviolet light, and guarantee the curing effect and production efficiency of the slurry. In step S7, the agglomerated particles or impurities are removed by filtration, which can prevent these impurities from affecting the conductivity, curing performance, and printing quality of the slurry. The quality inspection covers multiple aspects such as conductivity, curing performance, appearance and particle distribution, component analysis, and adhesion detection, which can comprehensively control the product quality. Only the products that pass the inspection are packaged, ensuring the reliability of the product quality and improving the competitiveness of the product in the market.

[0025] In step S2, the rotation speed of the high-speed mixer is 3000 - 5000 r / min. Based on the shear force generated by high-speed rotation, the materials are dispersed, and the stirring time is 2 - 4 hours. The stirring is paused every 30 minutes to observe the stirring effect.

[0026] In step S2 of this application, after adding the weighed conductive filler, carbon nanotubes, and graphene to the solvent, they are dispersed using a high-speed mixer. This step is of great significance. The rotation speed of the mixer is set at 3000 - 5000 r / min. The powerful shear force generated by high-speed rotation can effectively break the agglomerated structure of the materials, promote their uniform distribution in the solvent, and lay a foundation for the subsequent formation of a stable conductive network and ensuring the consistency of the slurry performance. The stirring time of 2 - 4 hours can not only ensure the full dispersion of the materials but also avoid damaging the material structure due to excessive stirring. Pausing the stirring every 30 minutes to observe the effect allows the operator to promptly discover problems such as uneven dispersion or agglomeration, and then adjust the stirring time and speed. This not only avoids blind stirring, improves production efficiency, but also ensures the stable dispersion quality of each batch of slurry and enhances the product quality stability.

[0027] In step S3, after the preparation of the mixed dispersion liquid is completed, start the low-speed stirring equipment, set the stirring speed at 100 - 200 r / min, use a graduated separating funnel, weigh the reactive diluent according to the formula and add it to the mixed dispersion liquid, control the dropping speed of the reactive diluent, and keep dropping evenly at a speed of 2 - 3 drops per second. After all the reactive diluent is added, continue to maintain the current stirring speed and stir continuously for 30 min, and control the ambient temperature at 25°C ± 2°C.

[0028] In step S3 of this application, after the preparation of the mixed dispersion liquid is completed, a series of operations are of great significance for ensuring the quality of the ultraviolet-curable conductive paste. Start the low-speed stirring equipment with a speed set at 100 - 200 r / min, and use a graduated separating funnel to evenly drop the reactive diluent into the mixed dispersion liquid at a speed of 2 - 3 drops per second, which can avoid too high local concentration, reduce the generation of bubbles, ensure the mixing uniformity, improve the product quality and reliability. After the addition is completed, stir continuously for 30 min to promote the full fusion of the reactive diluent with other components, better play its role in reducing viscosity and improving processing performance, enhance the synergistic effect between components, and improve the overall performance of the paste. Control the ambient temperature at 25°C ± 2°C to avoid the influence of temperature fluctuation on the viscosity and reaction activity of the reactive diluent, provide a stable environment for the mixing process, ensure the stable performance of the reactive diluent, and maintain the consistency of the product quality, which guarantees the quality and performance of the conductive paste from multiple aspects.

[0029] In step S4, during the addition of the additive, adjust the rotation speed to 80 - 120 r / min.

[0030] The quality inspection methods in step S7 include conductivity detection, curing performance detection, and curing efficiency.

[0031] Example 1: S1. Prepare materials, including: 220 parts of ultraviolet initiator, 110 parts of photosensitive resin, 500 parts of conductive filler, 120 parts of carbon nanotubes, 90 parts of graphene, 210 parts of additive, and 90 parts of reactive diluent; S2. Disperse the conductive filler, carbon nanotubes, and graphene. Add the weighed conductive filler, carbon nanotubes, and graphene to the solvent and disperse them based on a high-speed stirrer to form a stable mixed dispersion liquid; S3. Add the reactive diluent. Under continuous stirring, slowly add the weighed reactive diluent to the mixed dispersion liquid and continue stirring for 30 min; S4. Add the additive. Gradually add the additive to the mixed liquid and continue stirring for 30 min; S5. Mix the photosensitive resin. Slowly add the weighed photosensitive resin to the mixed liquid, use a low-speed stirrer, and stir for 1 h to mix evenly; S6. Add a UV initiator. Add the UV initiator to the mixed system and stir for 30 min to ensure that the UV initiator is dispersed in the slurry. S7. Filtration and quality inspection. Filter the prepared UV-curable conductive slurry through a filter screen to remove existing agglomerated particles or impurities, and conduct a quality inspection on the prepared conductive slurry. After passing the inspection, package it in a light-proof and sealed container.

[0032] Example 2: S1. Prepare materials, including: 110 parts of UV initiator, 120 parts of photosensitive resin, 220 parts of conductive filler, 120 parts of carbon nanotubes, 90 parts of graphene, 120 parts of additives, and 50 parts of reactive diluent. S2. Disperse the conductive filler, carbon nanotubes, and graphene. Add the weighed conductive filler, carbon nanotubes, and graphene to the solvent and disperse them based on a high-speed mixer to form a stable mixed dispersion. S3. Add the reactive diluent. Slowly add the weighed reactive diluent to the mixed dispersion under continuous stirring and continue stirring for 30 min. S4. Add the additives. Gradually add the additives to the mixed solution and continue stirring for 60 min. S5. Mix the photosensitive resin. Slowly add the weighed photosensitive resin to the mixed solution and use a low-speed stirrer to stir for 2 h to mix evenly. S6. Add a UV initiator. Add the UV initiator to the mixed system and stir for 30 min to ensure that the UV initiator is dispersed in the slurry. S7. Filtration and quality inspection. Filter the prepared UV-curable conductive slurry through a filter screen to remove existing agglomerated particles or impurities, and conduct a quality inspection on the prepared conductive slurry. After passing the inspection, package it in a light-proof and sealed container.

[0033] Conductivity detection Surface resistance measurement. Coat the slurry on an insulating substrate and let it dry. Use a four-probe tester to measure the surface resistance at different positions multiple times and take the average value, and compare it with the standard value. Volume resistivity measurement. After fabricating a sample with specific dimensions and curing it, use a resistivity tester to measure the volume resistivity at different parts multiple times, take the average value, and evaluate it.

[0034] Curing performance detection Hardness test. After coating and curing the slurry, use a pencil hardness tester to test it. The pencil hardness that does not exceed the specified scratch length represents the hardness of the sample. Adhesion test. After coating and curing, use a cross cutter to make grids, stick a 3M tape and pull it up, and evaluate the adhesion according to the standard rating. Curing efficiency detection Gel time measurement: The slurry is placed in the sample cell and irradiated with ultraviolet light. Record the time from irradiation to gel formation, and take the average value of multiple measurements to evaluate the efficiency; Double bond conversion rate measurement: The coated slurry is detected by FTIR before and after curing, and the conversion rate is calculated by comparing the change in the intensity of the characteristic peak of the double bond to evaluate the adequacy of the curing reaction.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A UV-curable conductive paste, characterized in that: Prepared from the following materials, including: 10-500 parts of ultraviolet initiator, 100-600 parts of photosensitive resin, 10-700 parts of conductive filler, 100-200 parts of carbon nanotubes, 1-200 parts of graphene, 10-340 parts of auxiliary agent and 20-300 parts of active diluent.

2. The UV-curable conductive paste according to claim 1, characterized in that: Specifically, it is prepared from the following materials: 220 parts of ultraviolet initiator, 110 parts of photosensitive resin, 500 parts of conductive filler, 120 parts of carbon nanotubes, 90 parts of graphene, 210 parts of auxiliary agent and 90 parts of active diluent.

3. The UV-curable conductive paste according to claim 1, characterized in that: The ultraviolet initiator is one of benzoin ether, acetophenone, acylphosphine oxides, hydrogen abstraction type photoinitiator and cleavage type photoinitiator; the photosensitive resin is one of epoxy acrylate, polyurethane acrylate and alicyclic epoxy resin photosensitive resin; the conductive filler is one of precious metal, base metal, graphite and carbon black.

4. The UV-curable conductive paste according to claim 1, characterized in that: The carbon nanotube is one of a single-walled carbon nanotube and a multi-walled carbon nanotube, and the graphene is one of a single-layer graphene, a double-layer graphene, a few-layer graphene and a multi-layer graphene.

5. The UV-curable conductive paste according to claim 1, characterized in that: The additives include plasticizers, stabilizers, fillers, flame retardants, dispersants and leveling agents, and the active diluent is one of monofunctional acrylate and multifunctional acrylate.

6. A method for preparing a UV-curable conductive paste, characterized in that: The preparation steps are: S1. Prepare materials, including: 10-500 parts of ultraviolet initiator, 100-600 parts of photosensitive resin, 10-700 parts of conductive filler, 100-200 parts of carbon nanotubes, 1-200 parts of graphene, 10-340 parts of auxiliary agent and 20-300 parts of active diluent; S2, dispersing the conductive filler, carbon nanotubes and graphene, adding the weighed conductive filler, carbon nanotubes and graphene into the solvent, and dispersing them using a high-speed stirrer to form a stable mixed dispersion; S3, adding active diluent, slowly adding the weighed active diluent to the mixed dispersion under continuous stirring, and continue stirring for 30 minutes; S4, adding additives, gradually adding the additives to the mixed solution, and continuing to stir for 30-60 minutes; S5, mixing the photosensitive resin, slowly adding the weighed photosensitive resin into the mixed solution, using a low-speed stirrer, stirring for 1-2 hours to mix evenly; S6, adding the UV initiator, adding the UV initiator to the mixed system, stirring for 30 minutes to ensure that the UV initiator is dispersed in the slurry; S7, filtration and quality inspection, filtering the prepared UV-curable conductive paste through a filter to remove existing agglomerated particles or impurities, and conducting quality inspection on the prepared conductive paste; after passing the inspection, it is packaged in a light-proof, sealed container.

7. The method for preparing a UV-curable conductive paste according to claim 6, characterized in that: In step S2, the rotation speed of the high-speed mixer is 3000-5000 r / min. The materials are dispersed based on the shear force generated by the high-speed rotation. The stirring time is 2-4 hours. The stirring is suspended every 30 minutes to observe the stirring effect.

8. The method for preparing a UV-curable conductive paste according to claim 6, characterized in that: In step S3, after the preparation of the mixed dispersion is completed, the low-speed stirring equipment is turned on, the stirring speed is set to 100-200r / min, and a separating funnel with a scale is used to weigh the active diluent according to the formula and add it to the mixed dispersion. The dropping speed of the active diluent is controlled to maintain a uniform dropping speed of 2-3 drops per second. After all the active diluents are added, the current stirring speed is continued, stirring is continued for 30 minutes, and the ambient temperature is controlled at 25°C±2°C.

9. The method for preparing a UV-curable conductive paste according to claim 6, characterized in that: During the addition of the additive in step S4, the rotation speed is adjusted to 80-120 r / min.

10. The method for preparing a UV-curable conductive paste according to claim 6, characterized in that: The quality inspection method in step S7 includes electrical conductivity inspection, curing performance inspection and curing efficiency inspection.

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