Antioxidant conductive silver paste for automotive glass and preparation method therefor

Abstract

An antioxidant conductive silver paste for automotive glass and a preparation method therefor. The raw materials comprise the following components in percentage by weight: 50-80% of spherical silver powder, 8-10% of flake silver powder, 0.5-2.0% of glass frit 1#, 0.5-2.0% of glass frit 2#, 1.0-2.0% of glass frit 3#, 0.3-1% of a dispersant, 0.1-0.5% of a thixotropic agent, 0.5-1.0% of a leveling agent, 2-10% of a polymer resin and 5-25% of an organic solvent. Optimizing the combination of silver powder and the use of organic additives improves the performance of the silver paste, and enhances the oxidation resistance and electrical conductivity.

Description

An antioxidant conductive silver paste for automotive glass and its preparation method Technical Field

[0001] This invention relates to the field of silver paste technology for automotive glass, and in particular to an antioxidant conductive silver paste for automotive glass and its preparation method. Background Technology

[0002] The rapid development of the global electronics industry has driven the continuous growth in demand for conductive silver paste. The rapid development of smartphones, computers, automotive electronics, photovoltaics, and other fields has increased the demand for conductive silver paste. The Chinese conductive silver paste market has seen significant growth, jumping from 36.175 billion yuan to 94 billion yuan in 2023, with an impressive average annual growth rate.

[0003] With the rise of the electronics industry, conductive silver paste has begun to be used in semiconductors, printed circuit boards, and other fields. As technology advances, its applications are expanding to emerging industries such as new energy and biomedicine. This places strict requirements on the performance of conductive silver paste. For automotive glass, the anti-oxidation performance of conductive silver paste is particularly important, as the silver wires on automotive glass are mainly used for heating to quickly defrost and defog. Oxidation will reduce the conductivity of the silver wires, affecting the heating effect and thus reducing the comfort and safety of the vehicle. In addition, oxidation of the silver trim around the windows will leave indelible spots, causing the silver strips to appear pale or grayish-white, affecting the vehicle's aesthetic appearance.

[0004] Chinese patent CN101613186A discloses a lead-free silver paste for high-temperature sintered automotive glass heating wires and its preparation method. The lead-free silver paste comprises the following components and contents (by weight): 50%–85% silver powder; 3%–7% lead-free silver glass powder; 3%–12% polymer binder; 7%–23% organic solvent; 1%–5% ultrafine metal compound; and 0.5%–3% additives. The components are mixed, dissolved, ground, and filtered to obtain the lead-free silver paste for high-temperature sintered automotive glass heating wires. However, it does not disclose its antioxidant properties, thus limiting its application. Summary of the Invention

[0005] The purpose of this invention is to provide an antioxidant conductive silver paste for automotive glass and its preparation method to improve the antioxidant properties of conductive silver paste. It not only meets the existing technical requirements of automotive glass in terms of conductivity, adhesion, and compatibility with black glaze, but also has antioxidant properties.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] One of the technical solutions of the present invention is to provide an antioxidant conductive silver paste for automotive glass, wherein the raw materials contain the following components and weight percentages:

[0008] Spherical silver powder 50-80%, flake silver powder 8-10%; glass powder 1# 0.5-2.0%, glass powder 2# 0.5-2.0%, glass powder 3# 1.0-2.0%; dispersant 0.3-1%; thixotropic agent 0.1-0.5%; leveling agent 0.5-1.0%; polymer resin 2-10%; organic solvent 5-25%.

[0009] In some specific embodiments, the spherical silver powder has a particle size of 0.5-3.0 μm and a tap density of 5.0-7.0 g / mL;

[0010] The flake-shaped silver powder has a particle size of 4-12 μm and a tap density of 1.0-3.0 g / mL.

[0011] In some specific embodiments, the glass powder 1# is lead-free glass powder with a particle size of 1.2-3.3μm, comprising the following components and weight percentages: 28% silicon dioxide, 6% niobium pentoxide, 0.5% ferric oxide, 8% sodium oxide, 13% boron oxide, 9.5% zinc oxide, 3% bismuth oxide, 9% titanium oxide, 1.5% manganese trioxide, 3.5% zirconium oxide, 4% yttrium oxide, 3% aluminum oxide, 3.5% lithium oxide, and 7.5% potassium oxide.

[0012] In some specific embodiments, the glass powder 2# is lead-free glass powder with a particle size of 0.5-2.1μm, and includes the following components and weight percentages: 3% titanium dioxide, 5% molybdenum trioxide, 5% cobalt tetroxide, 6% vanadium pentoxide, 68% bismuth trioxide, 4% silicon dioxide, 5% aluminum oxide, and 4% zinc oxide.

[0013] In some specific embodiments, the glass powder 3# is lead-free glass powder with a particle size of 2.0-3.0μm, comprising the following components and weight percentages: 11% silicon dioxide, 3% titanium dioxide, 4% a mixture of zinc oxide and aluminum oxide, 72% bismuth oxide, 7% boric acid, and 3% lithium carbonate, wherein the mass ratio of zinc oxide to aluminum oxide in the 4% mixture of zinc oxide and aluminum oxide is 1:1.

[0014] In some specific embodiments, the polymer resin is selected from any one or more of ethyl cellulose, nitrocellulose, and ethyl hydroxyethyl cellulose.

[0015] Preferably, the polymer resin is ethyl cellulose.

[0016] In some specific embodiments, the dispersant is selected from any one or more of polyvinyl alcohol, sodium dodecylbenzenesulfonate, polyvinylpyrrolidone, tributyl phosphate, oleic acid, stearic acid, and octanoic acid.

[0017] In some specific embodiments, the thixotropic agent is selected from any one or more of organobentonite, modified polyurea compounds, fumed silica, acrylic resin, and polyamide wax.

[0018] In some specific embodiments, the leveling agent is selected from any one or more of silicone resin, hydrogenated castor oil, polyvinyl butyral, and polyacrylate.

[0019] The organic solvent is selected from any one or a mixture of several of the following: terpineol, turpentine, diethylene glycol butyl ether, diethylene glycol dibutyl ether, and butyl carbitol acetate.

[0020] The second technical solution of the present invention is to provide a method for preparing an antioxidant conductive silver paste for automotive glass as described in one of the above technical solutions, comprising the following steps:

[0021] S1. Prepare materials according to the following components and weight percentages:

[0022] Spherical silver powder 50-80%, flake silver powder 8-10%; glass powder 1# 0.5-2.0%, glass powder 2# 0.5-2.0%, glass powder 3# 1.0-2.0%; dispersant 0.3-1%; thixotropic agent 0.1-0.5%; leveling agent 0.5-1.0%; polymer resin 2-10%; organic solvent 5-25%;

[0023] S2. Preparation of the carrier: Weigh the polymer resin and organic solvent, then heat them to 80°C and keep the temperature constant. After the polymer resin is completely dissolved, filter it through a 300-400 mesh screen to remove impurities, and the carrier is obtained.

[0024] S3. Preparation of silver paste: Weigh out spherical silver powder, flake silver powder, glass powder 1#, glass powder 2#, glass powder 3#, dispersant, thixotropic agent, and leveling agent, and mix them thoroughly with the carrier in a mixer. Then, use a high-speed dispersant to disperse them at high speed to obtain a uniform paste.

[0025] S4. Production of silver paste: The above paste is ground in a three-roll mill. The fineness of the silver paste is controlled to be below 15μm and the viscosity is 20-30Pa·S by fine adjustment of the rollers, thus preparing the antioxidant conductive silver paste for automotive glass.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention achieves particle size distribution through an innovative combination of silver powder formulation and tap density, thereby increasing the film thickness of the silver layer by improving the overlap of the silver powder. This not only enhances the antioxidant properties but also improves the electrical conductivity.

[0028] Specifically, by combining spherical and flake-shaped silver powders and adjusting different tap densities, the contact between the silver powders was optimized, increasing the film thickness and thus improving oxidation resistance and conductivity. Furthermore, by rationally selecting and utilizing organic additives, the screen printing performance of the silver paste was improved while increasing the film thickness. During high-temperature sintering, the organic substances in the silver paste decompose and volatilize, allowing the metallic silver powder and glass powder to firmly adhere to the glass substrate surface, achieving heating and electrical conductivity. The glass powder acts as a binder, located between the glass substrate and the metallic silver powder, while the metallic silver powder is embedded within the glass powder, creating gaps of varying sizes. The selection and combination of these silver powders determine the surface morphology of the silver paste and influence the oxidation resistance of the silver layer.

[0029] The ratio of glass powder to silver powder also affects the adhesion and oxidation resistance of silver paste. A higher glass powder content reduces the contact area between the silver powder and air, thus slowing down the oxidation process of the silver layer. In short, this invention improves the performance of silver paste and enhances its oxidation resistance and conductivity by optimizing the silver powder formulation and the use of organic additives.

[0030] The antioxidant silver paste for automotive glass prepared by this invention not only meets its basic performance requirements of conductivity, adhesion, and compatibility with black glaze, but also solves the drawback of traditional conductive silver paste for automotive glass turning black after oxidation, thus improving its antioxidant properties in harsh environments. Detailed Implementation

[0031] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0032] In the following embodiments, unless otherwise specified, the raw materials or processing techniques are conventional commercially available raw materials or conventional processing techniques in the art.

[0033] Example 1

[0034] (1) Prepare 100g of material according to the following components and mass:

[0035] The spherical silver powder used has a particle size of 1.5 μm and a tap density of 6.3 g / mL; the flake silver powder has a particle size of 6 μm and a tap density of 2.5 g / mL.

[0036] The average particle size of the glass powder No. 1 used is about 2μm, and its composition and percentage content are as follows: 28% silicon dioxide, 6% niobium pentoxide, 0.5% ferric oxide, 8% sodium oxide, 13% boron oxide, 9.5% zinc oxide, 3% bismuth oxide, 9% titanium oxide, 1.5% manganese trioxide, 3.5% zirconium oxide, 4% yttrium oxide, 3% aluminum oxide, 3.5% lithium oxide, and 7.5% potassium oxide.

[0037] The average particle size of the glass powder No. 2 used is about 1μm, and its composition and percentage content are: 3% titanium dioxide, 5% molybdenum trioxide, 5% cobalt tetroxide, 6% vanadium pentoxide, 68% bismuth trioxide, 4% silicon dioxide, 5% aluminum oxide, and 4% zinc oxide.

[0038] The average particle size of the glass powder No. 3 used is about 2.5μm. Its composition and percentage content are: 11% silicon dioxide, 3% titanium dioxide, 4% a mixture of zinc oxide and aluminum oxide (the mass ratio of zinc oxide to aluminum oxide is 1:1), 72% bismuth oxide, 7% boric acid, and 3% lithium carbonate.

[0039] The dispersant used was 0.5g polyvinyl alcohol, the thixotropic agent used was 0.1g polyamide wax, the leveling agent used was 0.5g silicone resin, the polymer resin used was ethyl cellulose, and the organic solvent used was terpineol.

[0040] (2) Preparation of carrier: Weigh ethyl cellulose and terpineol, then heat them to 80°C and keep the temperature constant. After the ethyl cellulose is completely dissolved, filter them through a 300-400 mesh screen to remove impurities, and the carrier is obtained.

[0041] (3) Preparation of silver paste: Weigh out spherical silver powder, flake silver powder, glass powder 1#, glass powder 2#, glass powder 3#, dispersant, thixotropic agent, and leveling agent, and mix them thoroughly with the carrier in a mixer. Then, use a high-speed dispersant to disperse them at high speed to obtain a uniform paste.

[0042] (4) Production of silver paste: The above paste is ground 5 times in a three-roll mill. The fineness of the silver paste is controlled to be below 15μm and the viscosity is 20-30Pa·S by fine adjustment of the rollers, thus obtaining the antioxidant conductive silver paste for automotive glass.

[0043] Example 2

[0044] (1) Prepare 100g of material according to the following components and mass:

[0045] The spherical silver powder used had a particle size of 1.6 μm and a tap density of 5.8 g / mL; the flake silver powder used had a particle size of 6.5 μm and a tap density of 2.5 g / mL.

[0046] The average particle size of the glass powder No. 1 used is about 2μm, and its composition and percentage content are as follows: 28% silicon dioxide, 6% niobium pentoxide, 0.5% ferric oxide, 8% sodium oxide, 13% boron oxide, 9.5% zinc oxide, 3% bismuth oxide, 9% titanium oxide, 1.5% manganese trioxide, 3.5% zirconium oxide, 4% yttrium oxide, 3% aluminum oxide, 3.5% lithium oxide, and 7.5% potassium oxide.

[0047] The average particle size of the glass powder No. 2 used is about 1μm, and its composition and percentage content are: 3% titanium dioxide, 5% molybdenum trioxide, 5% cobalt tetroxide, 6% vanadium pentoxide, 68% bismuth trioxide, 4% silicon dioxide, 5% aluminum oxide, and 4% zinc oxide.

[0048] The average particle size of the glass powder No. 3 used is about 2.5μm. Its composition and percentage content are: 11% silicon dioxide, 3% titanium dioxide, 4% a mixture of zinc oxide and aluminum oxide (the mass ratio of zinc oxide to aluminum oxide is 1:1), 72% bismuth oxide, 7% boric acid, and 3% lithium carbonate.

[0049] The dispersant used was 0.5% polyvinyl alcohol; the thixotropic agent used was 0.1% polyamide wax; the leveling agent used was 0.5% silicone resin; the polymer resin used was ethyl cellulose; and the organic solvent used was terpineol.

[0050] (2) Preparation of carrier: Weigh ethyl cellulose and terpineol, then heat them to 80°C and keep the temperature constant. After the ethyl cellulose is completely dissolved, filter them through a 300-400 mesh screen to remove impurities, and the carrier is obtained.

[0051] (3) Preparation of silver paste: Weigh out spherical silver powder, flake silver powder, glass powder 1#, glass powder 2#, glass powder 3#, dispersant, thixotropic agent, and leveling agent, and mix them thoroughly with the carrier in a mixer. Then, use a high-speed dispersant to disperse them at high speed to obtain a uniform paste.

[0052] (4) Production of silver paste: The above paste is ground 7 times in a three-roll mill. The fineness of the silver paste is controlled to be below 15μm and the viscosity is 20-30a·S by fine adjustment of the rollers, thus obtaining the antioxidant conductive silver paste for automotive glass.

[0053] Example 3

[0054] (1) Prepare 100 units of material according to the following composition and mass:

[0055] The spherical silver powder used has a particle size of 1.6 μm and a tap density of 5.0 g / mL; the flake silver powder has a particle size of 6.5 μm and a tap density of 2.5 g / mL.

[0056] The average particle size of the glass powder No. 1 used is about 2μm, and its composition and percentage content are as follows: 28% silicon dioxide, 6% niobium pentoxide, 0.5% ferric oxide, 8% sodium oxide, 13% boron oxide, 9.5% zinc oxide, 3% bismuth oxide, 9% titanium oxide, 1.5% manganese trioxide, 3.5% zirconium oxide, 4% yttrium oxide, 3% aluminum oxide, 3.5% lithium oxide, and 7.5% potassium oxide.

[0057] The average particle size of the glass powder No. 2 used is about 1μm, and its composition and percentage content are: 3% titanium dioxide, 5% molybdenum trioxide, 5% cobalt tetroxide, 6% vanadium pentoxide, 68% bismuth trioxide, 4% silicon dioxide, 5% aluminum oxide, and 4% zinc oxide.

[0058] The average particle size of the glass powder No. 3 used is about 2.5μm. Its composition and percentage content are: 11% silicon dioxide, 3% titanium dioxide, 4% a mixture of zinc oxide and aluminum oxide (the mass ratio of zinc oxide to aluminum oxide is 1:1), 72% bismuth oxide, 7% boric acid, and 3% lithium carbonate.

[0059] The dispersant used was 0.5g polyvinyl alcohol; the thixotropic agent used was 0.1g polyamide wax; the leveling agent used was 0.5g silicone resin; the polymer resin used was ethyl cellulose; and the organic solvent used was terpineol.

[0060] (2) Preparation of carrier: Weigh ethyl cellulose and terpineol, then heat them to 80°C and keep the temperature constant. After the ethyl cellulose is completely dissolved, filter them through a 300-400 mesh screen to remove impurities, and the carrier is obtained.

[0061] (3) Preparation of silver paste: Weigh out spherical silver powder, flake silver powder, glass powder 1#, glass powder 2#, glass powder 3#, dispersant, thixotropic agent, and leveling agent, and mix them thoroughly with the carrier in a mixer. Then, use a high-speed dispersant to disperse them at high speed to obtain a uniform paste.

[0062] (4) Production of silver paste: The above paste is ground 7 times in a three-roll mill. The fineness of the silver paste is controlled to be below 15μm and the viscosity is 20-30Pa·S by fine adjustment of the rollers, thus obtaining the antioxidant conductive silver paste for automotive glass.

[0063] Example 4

[0064] (1) Prepare 100g of material according to the following components and mass:

[0065] The spherical silver powder used has a particle size of 1.6 μm and a tap density of 5.0 g / mL; the flake silver powder has a particle size of 6.5 μm and a tap density of 2.5 g / mL.

[0066] The average particle size of the glass powder No. 1 used is 2μm, and its composition and percentage content are as follows: 28% silicon dioxide, 6% niobium pentoxide, 0.5% ferric oxide, 8% sodium oxide, 13% boron oxide, 9.5% zinc oxide, 3% bismuth oxide, 9% titanium oxide, 1.5% manganese trioxide, 3.5% zirconium oxide, 4% yttrium oxide, 3% aluminum oxide, 3.5% lithium oxide, and 7.5% potassium oxide.

[0067] The average particle size of the glass powder No. 2 used is 1μm, and its composition and percentage content are: 3% titanium dioxide, 5% molybdenum trioxide, 5% cobalt tetroxide, 6% vanadium pentoxide, 68% bismuth trioxide, 4% silicon dioxide, 5% aluminum oxide, and 4% zinc oxide.

[0068] The average particle size of the glass powder No. 3 used is 2.5μm, and its composition and percentage content are as follows: 11% silicon dioxide, 3% titanium dioxide, 4% a mixture of zinc oxide and aluminum oxide (the mass ratio of zinc oxide to aluminum oxide is 1:1), 72% bismuth oxide, 7% boric acid, and 3% lithium carbonate.

[0069] The dispersant used was 0.5g polyvinyl alcohol; the thixotropic agent used was 0.1g polyamide wax; the leveling agent used was 0.5g silicone resin; the polymer resin used was ethyl cellulose; and the organic solvent used was terpineol.

[0070] (2) Preparation of carrier: Weigh ethyl cellulose and terpineol, then heat them to 80°C and keep the temperature constant. After the ethyl cellulose is completely dissolved, filter them through a 300-400 mesh screen to remove impurities, and the carrier is obtained.

[0071] (3) Preparation of silver paste: Weigh out spherical silver powder, flake silver powder, glass powder 1#, glass powder 2#, glass powder 3#, dispersant, thixotropic agent, and leveling agent, and mix them thoroughly with the carrier in a mixer. Then, use a high-speed dispersant to disperse them at high speed to obtain a uniform paste.

[0072] (4) Production of silver paste: The above paste is ground 7 times in a three-roll mill. The fineness of the silver paste is controlled to be below 15μm and the viscosity is 20-30Pa·S by fine adjustment of the rollers, thus obtaining the antioxidant conductive silver paste for automotive glass.

[0073] Example 5

[0074] (1) Prepare 100g of material according to the following components and mass:

[0075] The spherical silver powder used has a particle size of 1.6 μm and a tap density of 5.0 g / mL; the flake silver powder has a particle size of 6.5 μm and a tap density of 2.5 g / mL.

[0076] The average particle size of the glass powder No. 1 used is 2μm, and its composition and percentage content are as follows: 28% silicon dioxide, 6% niobium pentoxide, 0.5% ferric oxide, 8% sodium oxide, 13% boron oxide, 9.5% zinc oxide, 3% bismuth oxide, 9% titanium oxide, 1.5% manganese trioxide, 3.5% zirconium oxide, 4% yttrium oxide, 3% aluminum oxide, 3.5% lithium oxide, and 7.5% potassium oxide.

[0077] The average particle size of the glass powder No. 2 used is 1μm, and its composition and percentage content are: 3% titanium dioxide, 5% molybdenum trioxide, 5% cobalt tetroxide, 6% vanadium pentoxide, 68% bismuth trioxide, 4% silicon dioxide, 5% aluminum oxide, and 4% zinc oxide.

[0078] The average particle size of the glass powder No. 3 used is 2.5μm, and its composition and percentage content are as follows: 11% silicon dioxide, 3% titanium dioxide, 4% a mixture of zinc oxide and aluminum oxide (the mass ratio of zinc oxide to aluminum oxide is 1:1), 72% bismuth oxide, 7% boric acid, and 3% lithium carbonate.

[0079] The dispersant used was 0.5g polyvinyl alcohol; the thixotropic agent used was 0.1g polyamide wax; the leveling agent used was 0.5g silicone resin; the polymer resin used was ethyl cellulose; and the organic solvent used was terpineol.

[0080] (2) Preparation of carrier: Weigh ethyl cellulose and terpineol, then heat them to 80°C and keep the temperature constant. After the ethyl cellulose is completely dissolved, filter them through a 300-400 mesh screen to remove impurities, and the carrier is obtained.

[0081] (3) Preparation of silver paste: Weigh out spherical silver powder, flake silver powder, glass powder 1#, glass powder 2#, glass powder 3#, dispersant, thixotropic agent, and leveling agent, and mix them thoroughly with the carrier in a mixer. Then, use a high-speed dispersant to disperse them at high speed to obtain a uniform paste.

[0082] (4) Production of silver paste: The above paste is ground 7 times in a three-roll mill. The fineness of the silver paste is controlled to be below 15μm and the viscosity is 20-30Pa·S by fine adjustment of the rollers, thus obtaining the antioxidant conductive silver paste for automotive glass.

[0083] The antioxidant conductive silver pastes for automotive glass prepared in Examples 1-5 above were subjected to performance tests, and the results are shown in Table 1:

[0084] Table 1

[0085] In summary, through Examples 1-5, it can be seen that different combinations of silver powder with different tap densities have different effects on the performance of silver paste. Under the condition of the same flake silver powder, as the tap density of spherical silver powder increases, the anti-oxidation performance and the compatibility with black glaze are better, the resistance decreases, the conductivity increases, and the welding strength also increases.

[0086] The silver paste prepared by this invention not only has excellent antioxidant properties, but also has certain advantages in conductivity, compatibility with black glaze, and welding strength.

[0087] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. An antioxidant conductive silver paste for automotive glass, characterized in that, The raw materials consist of the following components and their weight percentages: Spherical silver powder 50-80%, flake silver powder 8-10%; glass powder 1# 0.5-2.0%, glass powder 2# 0.5-2.0%, glass powder 3# 1.0-2.0%; dispersant 0.3-1%; thixotropic agent 0.1-0.5%; leveling agent 0.5-1.0%; polymer resin 2-10%; organic solvent 5-25%.

2. The antioxidant conductive silver paste for automotive glass according to claim 1, characterized in that, The spherical silver powder has a particle size of 0.5-3.0 μm and a tap density of 5.0-7.0 g / mL; The flake-shaped silver powder has a particle size of 4-12 μm and a tap density of 1.0-3.0 g / mL.

3. The antioxidant conductive silver paste for automotive glass according to claim 1, characterized in that, The glass powder #1 is lead-free glass powder with a particle size of 1.2-3.3μm, and includes the following components and weight percentages: 28% silicon dioxide, 6% niobium pentoxide, 0.5% ferric oxide, 8% sodium oxide, 13% boron oxide, 9.5% zinc oxide, 3% bismuth oxide, 9% titanium oxide, 1.5% manganese trioxide, 3.5% zirconium oxide, 4% yttrium oxide, 3% aluminum oxide, 3.5% lithium oxide, and 7.5% potassium oxide.

4. The antioxidant conductive silver paste for automotive glass according to claim 1, characterized in that, The glass powder #2 is lead-free glass powder with a particle size of 0.5-2.1μm, and includes the following components and weight percentages: 3% titanium dioxide, 5% molybdenum trioxide, 5% cobalt tetroxide, 6% vanadium pentoxide, 68% bismuth trioxide, 4% silicon dioxide, 5% aluminum oxide, and 4% zinc oxide.

5. The antioxidant conductive silver paste for automotive glass according to claim 1, characterized in that, The glass powder #3 is lead-free glass powder with a particle size of 2.0-3.0μm, and includes the following components and weight percentages: 11% silicon dioxide, 3% titanium dioxide, 4% a mixture of zinc oxide and aluminum oxide, 72% bismuth oxide, 7% boric acid, and 3% lithium carbonate, wherein the mass ratio of zinc oxide to aluminum oxide in the 4% mixture of zinc oxide and aluminum oxide is 1:

1.

6. The antioxidant conductive silver paste for automotive glass according to claim 1, characterized in that, The polymer resin is selected from any one or more of ethyl cellulose, nitrocellulose, and ethyl hydroxyethyl cellulose.

7. The antioxidant conductive silver paste for automotive glass according to claim 1, characterized in that, The dispersant is selected from any one or more of polyvinyl alcohol, sodium dodecylbenzenesulfonate, polyvinylpyrrolidone, tributyl phosphate, oleic acid, stearic acid, and octanoic acid.

8. The antioxidant conductive silver paste for automotive glass according to claim 1, characterized in that, The thixotropic agent is selected from any one or more of organobentonite, modified polyurea compounds, fumed silica, acrylic resin, and polyamide wax.

9. The antioxidant conductive silver paste for automotive glass according to claim 1, characterized in that, The leveling agent is selected from any one or more of the following: silicone resin, hydrogenated castor oil, polyvinyl butyral, and polyacrylate. The organic solvent is selected from any one or a mixture of several of the following: terpineol, turpentine, diethylene glycol butyl ether, diethylene glycol dibutyl ether, and butyl carbitol acetate.

10. A method for preparing an antioxidant conductive silver paste for automotive glass as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Prepare materials according to the following components and weight percentages: Spherical silver powder 50-80%, flake silver powder 8-10%; glass powder 1# 0.5-2.0%, glass powder 2# 0.5-2.0%, glass powder 3# 1.0-2.0%; dispersant 0.3-1%; thixotropic agent 0.1-0.5%; leveling agent 0.5-1.0%; polymer resin 2-10%; organic solvent 5-25%; S2. Preparation of the carrier: Weigh the polymer resin and organic solvent, then heat them to 80°C and keep the temperature constant. After the polymer resin is completely dissolved, filter it through a 300-400 mesh screen to remove impurities, and the carrier is obtained. S3. Preparation of silver paste: Weigh out spherical silver powder, flake silver powder, glass powder 1#, glass powder 2#, glass powder 3#, dispersant, thixotropic agent, and leveling agent, and mix them thoroughly with the carrier in a mixer. Then, use a high-speed dispersant to disperse them at high speed to obtain a uniform paste. S4. Production of silver paste: The above paste is ground in a three-roll mill. The fineness of the silver paste is controlled to be below 15μm and the viscosity is 20-30Pa·S by fine adjustment of the rollers, thus preparing the antioxidant conductive silver paste for automotive glass.

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