Glass composition, inorganic glass powder and preparation method therefor, and conductive silver paste for automotive pressed glass and preparation method therefor

Abstract

The present invention relates to a glass composition, an inorganic glass powder and a preparation method therefor, and a conductive silver paste for automotive pressed glass and a preparation method therefor. The glass composition comprises a first glass composition and a second glass composition, the first glass composition comprising Bi2O3, SiO2, B2O3, Sb2O3, Na2O, Al2O3, K2O, Li2O and CaO, and the second glass composition comprising Bi2O3, B2O3, ZnO, SiO2, CaF2, Al2O3, MgO and Sb2O3. The inorganic glass powder is prepared by mixing the two glass compositions, heating same to melt same, performing water quenching, and ball milling same into powder. The preparation method for the conductive silver paste for automotive pressed glass comprises: mixing an organic carrier, the inorganic glass powder, a functional aid and spherical silver powder, and grinding same to obtain the conductive silver paste for automotive pressed glass. Compared with the prior art, the present invention uses the silver powder system which is of a polycrystalline-gap structure, the glass powder having a low melting point and various special functional auxiliaries, and thus has the advantages of a low sintering process window, good acid and base resistance, welding performance, wear resistance, ink matching property, etc., and can meet the technical requirements of production by the "pressing process".

Description

A glass composition, inorganic glass powder and its preparation method thereof, and a conductive silver paste for automotive pressed glass and its preparation method thereof. Technical Field

[0001] This invention belongs to the field of automotive glass heating technology, and relates to a glass composition, inorganic glass powder and its preparation method, and an automotive pressed glass conductive silver paste and its preparation method. Background Technology

[0002] With the continuous development and technological upgrading of my country's automotive industry, the manufacturing process of automotive glass has gradually evolved from traditional hot bending and tempering to fully automated glass shaping production, namely the "pressing method." This new process can be further divided into single-sheet pressing and double-sheet pressing. Compared to the traditional forming temperature of 650-720℃, the forming temperature of the pressing furnace is significantly reduced (maximum temperature is 650℃), production efficiency is greatly improved (generally 3 minutes), and overall energy consumption is significantly reduced. Given that the "pressing method" integrates temperature, flexibility, and force, the glass produced by extrusion shaping can have a deviation rate controlled within ±1mm, offering superior performance in terms of streamlined appearance and clarity, and thus has a promising future.

[0003] Currently, the conductive silver paste used in the new "pressing method" process is imported, such as DuPont's 30 series and Fluke's 19 series from the United States. These foreign products are mainly expensive and costly, and cannot provide rapid technical support. There is an urgent need to develop a press-type conductive silver paste product with purely domestic technology.

[0004] As a traditional conductive silver paste for automotive glass forming processes, various types of conductive silver pastes have been developed. For example, Chinese patent CN101613186A discloses a lead-free silver paste for heating wires of high-temperature sintered automotive glass and its preparation method; Chinese patent CN 113539545A discloses a gray conductive silver paste for automotive glass and its preparation method; Chinese patent CN 114171238A discloses a low-resistivity silver paste for automotive glass and its preparation method; and Chinese patent CN 105761777A discloses a fine-line silver paste for automotive glass and its preparation method.

[0005] However, none of these conductive silver pastes can meet the requirements of the pressing process. Summary of the Invention

[0006] The purpose of this invention is to provide a glass composition, inorganic glass powder and its preparation method, and a conductive silver paste for automotive pressed glass and its preparation method. This invention, using a polycrystalline-interstitial silver powder system, low-melting-point glass powder and various special functional additives, has advantages such as a low sintering process window, acid and alkali resistance, weldability, wear resistance, and good ink compatibility, and can meet the technical requirements of the "pressing method" production process.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A first aspect of the present invention provides a glass composition comprising a first glass composition and a second glass composition in a mass ratio of (10-90):(30-70);

[0009] The first glass composition comprises the following components and their weight percentages:

[0010] The second glass composition comprises the following components and their weight percentages:

[0011] A second aspect of the present invention provides a method for preparing inorganic glass powder based on the above-mentioned glass composition, comprising: heating and melting the first glass composition and the second glass composition respectively, quenching them with water to obtain first glass beads and second glass beads, ball milling them into powder, and mixing them to obtain inorganic glass powder.

[0012] Further, in the heating and melting process, the heating temperature is 1100-1300℃, preferably 1150-1250℃, and the heating time is preferably 30-60 min; and / or,

[0013] In the ball milling process, the milling medium is ethanol, the milling balls are made of zirconium oxide, the mass ratio of the milling balls, the water-quenched solid phase, and the milling medium is 2.2:1:0.3, the milling speed is 150-250 rpm, and the milling time is 24-48 h.

[0014] A third aspect of the present invention provides a conductive silver paste for automotive pressed glass, comprising the following components and weight percentages:

[0015] Furthermore, the functional additive is selected from at least one of nickel oxide, titanium dioxide, manganese dioxide, molybdenum trioxide, bismuth trioxide, ferric oxide, cobalt tetroxide, cobalt phosphate, or vanadium pentoxide.

[0016] Furthermore, the actual density of the spherical silver powder is 5.30-6.25 g / cm³. 3 The loose bulk density is 3.0-4.0 g / cm³. 3 The average particle size is 1.0-2.0 μm, and the specific surface area is 0.35-0.75 m². 2 / g.

[0017] The fourth aspect of the present invention provides a method for preparing conductive silver paste for automotive pressed glass, comprising: mixing an organic carrier with inorganic glass powder, adding functional additives and mixing, then adding spherical silver powder and mixing, and grinding to obtain conductive silver paste for automotive pressed glass.

[0018] Furthermore, the method for preparing the organic carrier includes: dissolving a polymer resin in an organic solvent, adding a dispersant and mixing to obtain the organic carrier.

[0019] Further, the polymer resin is selected from at least one of acrylic resin, ethyl cellulose, nitrocellulose, ethyl hydroxyethyl cellulose, or rosin; the organic solvent is selected from at least one of terpineol, turpentine, diethylene glycol butyl ether, diethylene glycol dibutyl ether, butyl carbitol acetate, dipropylene glycol monomethyl ether, or tripropylene glycol monomethyl ether; and the dispersant is selected from at least one of ED120, ED420, or KD16.

[0020] Furthermore, the grinding includes 5-7 passes of intermittent progressive grinding and dispersion using a three-roll mill, resulting in a slurry with a grinding fineness of <12μm and a viscosity of 20-30Pa·S.

[0021] Compared with the prior art, the present invention has the following characteristics:

[0022] The two sets of glass powders provided by this invention, when mixed with metallic silver powder, organic carrier and special functional additives and slurryed, can meet the sintering window of the automotive glass pressing process.

[0023] This invention uses highly active silver powder with a polycrystalline structure and loose interstitial structure. In addition to its conductive function, it also significantly optimizes the sintering window of the conductive paste.

[0024] The special functional additives selected in this invention, in addition to providing basic properties such as wetting and dispersion, significantly improve the acid and alkali resistance of the conductive paste. The conductive silver paste for automotive pressed glass of this invention also possesses excellent wear resistance, weldability, and ink compatibility, among other properties. Attached Figure Description

[0025] Figure 1 is a field emission scanning electron microscope image of the pressed automotive glass sample prepared in Example 1. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] A glass composition comprising a first glass composition and a second glass composition in a mass ratio of (10-90):(30-70);

[0028] The first glass composition comprises the following components and their weight percentages:

[0029] The second glass composition comprises the following components and their weight percentages:

[0030] The above-mentioned glass composition is mixed with conductive metallic silver powder, an organic carrier, and special functional additives, and then slurryed to obtain a conductive silver paste with high welding strength, excellent acid and alkali resistance, outstanding wear resistance, and good black glaze compatibility. During the pressing process of the conductive silver paste containing the above-mentioned glass composition, in the early stage, the second glass composition melts and flows towards the glass substrate surface, carrying the metallic silver powder particles towards the glass substrate surface, exhibiting excellent bonding properties. In the later stage, as the temperature further increases, the first glass composition begins to soften and forms a skeleton throughout the structure of the conductive silver paste, enhancing the hardness and wear resistance of the silver paste.

[0031] In the glass composition, the glass formed by Bi2O3, SiO2, B2O3, ZnO, Na2O, Al2O3, K2O, and CaO is a Bi2O3-B2O3-SiO2 or Bi2O3-B2O3-SiO2-ZnO system; B2O3 and SiO2 are the network-shaped body of the glass, forming the basic framework structure; Bi2O3 is the network disruptor of the glass, forming the nodes of the silicon-oxygen framework fracture; ZnO and Al2O3 are intermediate oxides of the glass, which can both participate in the formation of the network and act as modifiers.

[0032] In the glass composition, Sb₂O₃ acts as a clarifying agent during the glass melting process, eliminating air bubbles. Furthermore, the addition of Sb₂O₃ can improve the hardness and wear resistance of the glass powder, thus contributing to enhanced overall wear resistance of the conductive silver paste.

[0033] In the glass composition, SiO2 helps to improve the acid resistance and stability of the glass powder. Glass composition B# has the best acid resistance, which simultaneously improves the overall acid resistance of the conductive silver paste.

[0034] In the glass composition, Na2O and K2O help improve the flow properties of the glass powder during softening and optimize the welding performance between the conductive silver paste and automotive glass.

[0035] In the glass composition, the mixing ratio of the first glass composition to the second glass composition by weight is 10:90 to 30:70, more preferably 15:85 to 25:75.

[0036] The glass composition provided by this invention is in powder form with a D50 of less than 3μm, which is beneficial for the subsequent preparation of conductive silver paste.

[0037] The glass composition provided by this invention is amorphous, that is, the crystallinity is 0%.

[0038] A method for preparing inorganic glass powder based on the above-mentioned glass composition includes: heating the first glass composition and the second glass composition to complete melting and then water quenching, filtering to obtain first glass beads and second glass beads, and finally ball milling the first glass beads and the second glass beads separately and mixing them to obtain inorganic glass powder.

[0039] In some specific embodiments, the first glass composition and the second glass composition are mixed using a V-type mixer for 1-3 hours, and preferably sieved through a 100-mesh screen.

[0040] In some specific embodiments, the melting temperature is 1100-1300℃, preferably 1150-1250℃, and the heating time is preferably 30-60min.

[0041] In some specific embodiments, the ball milling medium is ethanol, the ball milling ball is made of zirconium oxide, the mass ratio of the ball milling ball, the water-quenched solid phase, and the ball milling medium is 2.2:1:0.3, the ball milling speed is 150-250 rpm, and the ball milling time is 24-48 h.

[0042] In some specific embodiments, the particle size D50 of the inorganic glass powder is 2-3 μm, the melting temperature of the first inorganic glass powder is 600-700℃, and the melting temperature of the second inorganic glass powder is 550-650℃.

[0043] A conductive silver paste for automotive pressed glass comprises the following components and their weight percentages:

[0044] In some specific embodiments, the conductive silver paste for automotive pressed glass comprises the following components and their weight percentages:

[0045] In some specific embodiments, the functional additives include fluxes, colorants, or corrosion inhibitors, primarily selected from inorganic oxides, such as at least one of nickel oxide, titanium dioxide, manganese dioxide, molybdenum trioxide, bismuth trioxide, ferric oxide, cobalt tetroxide, cobalt phosphate, or vanadium pentoxide.

[0046] In some specific embodiments, the spherical silver powder is a highly active silver powder with a polycrystalline and loose interstitial structure, and its actual density is 5.30-6.25 g / cm³. 3 The loose bulk density is 3.0-4.0 g / cm³. 3 The average particle size is 1.0-2.0 μm, and the specific surface area is 0.35-0.75 m². 2 / g.

[0047] A method for preparing conductive silver paste for automotive pressed glass includes: mixing an organic carrier with inorganic glass powder, adding functional additives and mixing, then adding spherical silver powder and mixing, and grinding to obtain conductive silver paste for automotive pressed glass.

[0048] In some specific embodiments, the method for preparing the organic carrier includes: dissolving a polymer resin in an organic solvent, adding a dispersant and mixing to obtain the organic carrier.

[0049] In some specific embodiments, the polymeric resin is selected from at least one of acrylic resin, ethyl cellulose, nitrocellulose, ethyl hydroxyethyl cellulose, or rosin.

[0050] In some specific embodiments, the organic solvent is selected from at least one of terpineol, turpentine oil, diethylene glycol butyl ether, diethylene glycol dibutyl ether, butyl carbitol acetate, dipropylene glycol monomethyl ether, or tripropylene glycol monomethyl ether. Preferably, the organic solvent is diethylene glycol butyl ether.

[0051] In some specific embodiments, the dispersant is selected from at least one of Kusunoki Chemical Co., Ltd.'s ED120 dispersant, ED420 dispersant, or Croda Chemicals (Shanghai) Co., Ltd.'s KD16 dispersant, preferably a copolymer of carboxylic acid groups.

[0052] In some specific embodiments, the mixture of polymer resin, organic solvent, and dispersant contains 5-30% by mass of polymer resin, preferably 12-25%, 1-3% by mass of additives, and the remainder is solvent, thus exhibiting excellent coating performance.

[0053] In some specific embodiments, the grinding includes intermittent progressive grinding and dispersion through a three-roll mill for 5-7 passes, resulting in a slurry with a grinding fineness of <12μm and a viscosity of 20-30Pa·S.

[0054] In some specific embodiments, spherical silver powder, inorganic glass powder and functional additives are directly added to the organic carrier and rapidly dispersed using a high-speed disperser for 30 minutes to ensure that all components in the slurry are uniformly dispersed.

[0055] The conductive silver paste for automotive pressed glass of the present invention not only meets the basic sintering and molding process of automotive pressed glass, but also has excellent wear resistance, welding performance and ink compatibility.

[0056] This embodiment is implemented based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiment.

[0057] The following are more detailed implementation examples, which further illustrate the technical solution of the present invention and the technical effects that can be obtained.

[0058] In the following embodiments, unless otherwise specified, the raw materials, reagents or processing techniques are all conventional commercial products or conventional processing techniques in the art.

[0059] Example 1

[0060] A conductive silver paste SP1 for automotive pressed glass, the preparation method of which includes the following steps:

[0061] (1) Preparation of inorganic glass powder:

[0062] Glass composition B#: Weigh 61 parts by weight of Bi2O3, 27 parts by weight of SiO2, 5 parts by weight of B2O3, 3 parts by weight of Sb2O3, 1.5 parts by weight of Na2O, 0.3 parts by weight of Al2O3, 0.3 parts by weight of K2O, 0.5 parts by weight of Li2O, and 0.3 parts by weight of CaO.

[0063] Glass composition C#: Weigh 66 parts by weight of Bi2O3, 22 parts by weight of B2O3, 3 parts by weight of ZnO, 4 parts by weight of SiO2, 2 parts by weight of CaF2, 1.5 parts by weight of Al2O3, 1 part by weight of MgO, and 0.3 parts by weight of Sb2O3.

[0064] The two compositions were stirred separately and thoroughly using a V-type mixer, then transferred to an alumina crucible and placed in a silicon molybdenum rod resistance furnace. The furnace was heated to 1200℃ and held for 30 minutes. After water quenching and filtration, glass beads were obtained.

[0065] Glass beads were loaded into a ball mill jar at a mass ratio of zirconia balls:glass beads:ethanol = 2.2:1:0.3, and the jar was rotated at 200 rpm for 24 hours. The particle size distribution was then tested. Glass powder of composition B# and glass powder of composition C# were mixed at a mass ratio of 20:80 to obtain inorganic glass powder G1 of this embodiment.

[0066] (2) Preparation of organic carriers:

[0067] Weigh 88 parts by weight of diethylene glycol butyl ether, add 12 parts by weight of ethyl cellulose STD-7 (Dow viscosity is 7) from Dow Chemical (China) Co., Ltd., heat to 80°C and keep the temperature constant. After the ethyl cellulose resin is completely dissolved, filter it through a 400-mesh screen to remove impurities. Finally, add 5 parts by weight of dispersant ED420 at room temperature and stir evenly to obtain organic carrier V12.

[0068] (3) Preparation of conductive silver paste:

[0069] Weigh 10 parts by weight of organic carrier V12 and place it in a stainless steel container. Add 4 parts by weight of inorganic glass powder G-1 while stirring, and stir until homogeneous. Then, add 0.5 parts by weight of cobalt phosphate and 0.5 parts by weight of vanadium pentoxide, and stir until homogeneous.

[0070] Finally, 85 parts by weight of metallic silver powder QH-1 from Hubei Hashen Green Energy New Materials Co., Ltd. were added in batches and stirred at high speed until homogeneous. The mixture was then ground seven times using a three-roll mill with a diameter of 260 mm, resulting in a slurry with a fineness of 11 μm and a viscosity of 25 Pa·S, thus obtaining conductive silver paste SP1 for automotive pressed glass.

[0071] Example 2

[0072] A conductive silver paste SP2 for automotive pressed glass, the preparation method of which differs from that in Example 1 only in that:

[0073] In step (1), the glass composition B# is: 65 parts by weight of Bi2O3, 24 parts by weight of SiO2, 5 parts by weight of B2O3, 3 parts by weight of Sb2O3, 1.5 parts by weight of Na2O, 0.3 parts by weight of Al2O3, 0.3 parts by weight of K2O, 0.5 parts by weight of Li2O, and 0.3 parts by weight of CaO.

[0074] Glass composition C#: Weigh 68 parts by weight of Bi2O3, 20 parts by weight of B2O3, 3 parts by weight of ZnO, 3 parts by weight of SiO2, 2 parts by weight of CaF2, 1.5 parts by weight of Al2O3, 1 part by weight of MgO, and 0.3 parts by weight of Sb2O3.

[0075] The resulting inorganic glass powder is denoted as G2.

[0076] The rest is the same as in Example 1.

[0077] Example 3

[0078] A conductive silver paste SP3 for automotive pressed glass, the preparation method of which differs from that in Example 1 only in that:

[0079] In step (1), the glass composition B# is: 59 parts by weight of Bi2O3, 28 parts by weight of SiO2, 5 parts by weight of B2O3, 2 parts by weight of Sb2O3, 1.5 parts by weight of Na2O, 0.3 parts by weight of Al2O3, 0.3 parts by weight of K2O, 0.5 parts by weight of Li2O, and 0.3 parts by weight of CaO.

[0080] Glass composition C#: Weigh 64 parts by weight of Bi2O3, 24 parts by weight of B2O3, 3 parts by weight of ZnO, 3 parts by weight of SiO2, 2 parts by weight of CaF2, 1.5 parts by weight of Al2O3, 1 part by weight of MgO, and 0.3 parts by weight of Sb2O3.

[0081] The resulting inorganic glass powder is denoted as G3.

[0082] The rest is the same as in Example 1.

[0083] Example 4

[0084] A conductive silver paste SP4 for automotive pressed glass, the preparation method of which differs from that in Example 1 only in that:

[0085] In step (3), 14 parts by weight of organic carrier V12 are weighed and placed in a stainless steel bucket. 5 parts by weight of inorganic glass powder G-1 are added while stirring, and the mixture is stirred until homogeneous. Then, 0.5 parts by weight of bismuth trioxide and 0.5 parts by weight of vanadium pentoxide are added, and the mixture is stirred until homogeneous.

[0086] Finally, 80 parts by weight of metallic silver powder QH-1 were added in batches and stirred at high speed until homogeneous. The mixture was then ground seven times using a three-roll mill with a diameter of 260 mm, resulting in a slurry with a fineness of 10 μm and a viscosity of 28 Pa·s, thus obtaining conductive silver paste SP4 for automotive pressed glass.

[0087] Example 5

[0088] A conductive silver paste SP5 for automotive pressed glass, the preparation method of which differs from that in Example 1 only in that:

[0089] In step (3), 18 parts by weight of organic carrier V12 are weighed and placed in a stainless steel bucket. 6 parts by weight of inorganic glass powder G-1 are added while stirring, and the mixture is stirred until homogeneous. Then, 0.5 parts by weight of bismuth trioxide and 0.5 parts by weight of vanadium pentoxide are added, and the mixture is stirred until homogeneous.

[0090] Finally, 75 parts by weight of metallic silver powder QH-1 were added in batches and stirred at high speed until homogeneous. The mixture was then ground six times using a three-roll mill with a diameter of 260 mm, resulting in a slurry with a fineness of 10 μm and a viscosity of 27 Pa·S, thus obtaining conductive silver paste SP5 for automotive pressed glass.

[0091] Comparative Example 1

[0092] A conductive silver paste D1 for automotive pressed glass is prepared in a way that differs from that of Example 1 only in that: in the ball milling step (1), only the composition B# glass powder is used while the total amount of glass powder remains unchanged, and the rest is the same as in Example 1.

[0093] Comparative Example 2

[0094] A conductive silver paste D2 for automotive pressed glass is prepared in a way that differs from that in Example 1 only in that: in the ball milling step (1), while the total amount of glass powder remains unchanged, only the composition C# glass beads are used, and the rest is the same as in Example 1.

[0095] Application Examples:

[0096] This embodiment is used to characterize the performance of the conductive silver paste for automotive pressed glass prepared in Examples 1 to 5, including:

[0097] 1. Performance testing of inorganic glass powder:

[0098] The particle size distribution and melting temperature of inorganic glass powders G1-G3 were tested using a laser particle size analyzer (Jinan Micro-Nano Particle Technology Co., Ltd.), as shown in Table 1.

[0099] Table 1

[0100] 2. Performance testing of conductive silver paste for automotive pressed glass:

[0101] Examples 1-5 were screen-printed on automotive glass (note: black enamel overprinted glass) using a 200-mesh screen. The original glass sheet was 4mm thick and 2m x 1m in length and width. The printed silver paste lines (including busbars arranged side-by-side at both ends and lines perpendicularly connected between the busbars, each line being 0.5mm wide, 1200mm long, and 10 in number; the busbars were 10mm wide and 650mm long) were then placed in a tunnel oven and dried at 150℃ for 20 minutes. Finally, the glass was placed in a pressing furnace and pressed at 620-650℃ for 3 minutes, then cooled and shaped to obtain a pressed automotive glass sample.

[0102] (1) Silver content: GB / T 10046-2008;

[0103] (2) Resistance performance: The resistance between the two ends of the busbar in the silver paste circuit was directly tested using a multimeter;

[0104] (3) Welding strength: At the busbars at both ends of the glass, lead-free solder was used to weld at a temperature of 350°C, and after cooling, a tensile test was performed.

[0105] (4) Acid resistance: After annealing, the sample was cut and prepared with a size of 100mm*100mm. It was directly immersed in 0.1N sulfuric acid solution at 80℃ for 4 hours. After immersion, it was dried and covered with Scotch2525 tape. The peeling and falling off of the silver wire was observed.

[0106] (5) Wear resistance: The wear resistance tester TABER 5135, rotor CS-10F, load 100g, speed 1000 rpm was used to test the change rate of silver wire resistance before and after wear resistance.

[0107] The test results are shown in Table 2.

[0108] Table 2

[0109] 3. Microscopic testing of conductive silver paste for automotive pressed glass:

[0110] The microstructure of the formed (SP1) automotive pressed glass sample was analyzed using field emission scanning electron microscopy (SEM), as shown in Figure 1. The results show that the bonding between the metallic silver powder particles, molten glass powder, and special functional additives is very dense.

[0111] 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. A glass composition, characterized in that, The first glass composition and the second glass composition comprise a mass ratio of (10–90):(30–70); The first glass composition comprises the following components and their weight percentages: The second glass composition comprises the following components and their weight percentages:

2. A method for preparing inorganic glass powder based on the glass composition as described in claim 1, characterized in that, The method includes: heating and melting the first glass composition and the second glass composition separately, quenching them in water to obtain first glass beads and second glass beads, ball milling them into powder, and mixing them to obtain inorganic glass powder.

3. The method for preparing inorganic glass powder according to claim 2, characterized in that, During the heating and melting process, the heating temperature is 1100-1300℃; and / or, In the ball milling process, the milling medium is ethanol, the milling balls are made of zirconium oxide, the mass ratio of the milling balls, the water-quenched solid phase, and the milling medium is 2.2:1:0.3, the milling speed is 150-250 rpm, and the milling time is 24-48 h.

4. A conductive silver paste for automotive pressed glass, characterized in that, Includes the following components and their weight percentages: The inorganic glass powder is prepared by the method described in claim 2 or 3.

5. The conductive silver paste for automotive pressed glass according to claim 4, characterized in that, The functional additive is selected from at least one of nickel oxide, titanium dioxide, manganese dioxide, molybdenum trioxide, bismuth trioxide, ferric oxide, cobalt tetroxide, cobalt phosphate, or vanadium pentoxide.

6. The conductive silver paste for automotive pressed glass according to claim 4, characterized in that, The actual density of the spherical silver powder is 5.30-6.25 g / cm³. 3 The loose bulk density is 3.0-4.0 g / cm³. 3 The average particle size is 1.0-2.0 μm, and the specific surface area is 0.35-0.75 m². 2 / g.

7. A method for preparing conductive silver paste for automotive pressed glass as described in any one of claims 4 to 6, characterized in that, include: Organic carriers are mixed with inorganic glass powder, functional additives are added and mixed, then spherical silver powder is added and mixed, and then ground to obtain conductive silver paste for automotive pressed glass.

8. The method for preparing conductive silver paste for automotive pressed glass according to claim 7, characterized in that, The method for preparing the organic carrier includes: dissolving a polymer resin in an organic solvent, adding a dispersant and mixing to obtain the organic carrier.

9. The method for preparing conductive silver paste for automotive pressed glass according to claim 8, characterized in that, The polymer resin is selected from at least one of acrylic resin, ethyl cellulose, nitrocellulose, ethyl hydroxyethyl cellulose, or rosin; the organic solvent is selected from at least one of terpineol, turpentine, diethylene glycol butyl ether, diethylene glycol dibutyl ether, butyl carbitol acetate, dipropylene glycol monomethyl ether, or tripropylene glycol monomethyl ether; the dispersant is selected from at least one of ED120, ED420, or KD16.

10. The method for preparing conductive silver paste for automotive pressed glass according to claim 7, characterized in that, The grinding process includes 5-7 passes of intermittent progressive grinding and dispersion using a three-roll mill, resulting in a slurry with a fineness of <12μm and a viscosity of 20-30Pa·S.

Images