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CN-122025221-A - Silver paste for vehicle-mounted glass antenna and production process thereof

CN122025221ACN 122025221 ACN122025221 ACN 122025221ACN-122025221-A

Abstract

The invention discloses silver paste for a vehicle-mounted glass antenna and a production process thereof, the silver paste consists of silane coupling agent surface modified composite silver powder, composite lead-free glass powder, an organic carrier and a multifunctional composite additive. The composite silver powder is flake silver powder, spherical silver powder and silver nanowire are compounded according to the proportion of 4 (1-3) (0.5-0.8), and the composite lead-free glass powder contains La 2 O 3 -CeO 2 rare earth oxide and Nb 2 O 5 、TiO 2 、HfO 2 、Ta 2 O 5 multielement modified components. The production process comprises silver powder surface modification, glass powder presintering activation, mixing grinding, vacuum curing and graded filtering. The silver paste has low sheet resistance through multicomponent cooperative design The printing reject ratio of the line width of 0.1mm is 1.0%, the resistance change rate of the wet heat aging of 85 ℃ and 85% RH 1000h is only 1.3%, the adhesive force reaches 0 level, and the lead-free printing ink is environment-friendly.

Inventors

  • FU YUNSHENG
  • Hemar Hartley
  • SHI WEILI
  • ZHANG HONGWANG

Assignees

  • 无锡湃泰电子材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260325

Claims (10)

  1. 1. The silver paste for the vehicle-mounted glass antenna is characterized by comprising, by weight, 70-80 parts of silane coupling agent surface modified composite silver powder, 5-10 parts of composite lead-free glass powder, 10-20 parts of organic carrier and 1-3 parts of multifunctional composite additive, wherein the composite silver powder is formed by compounding (1-3) flake silver powder, spherical silver powder and silver nanowire according to the weight ratio of 4:0.5-0.8, and the composite lead-free glass powder comprises, by weight, B 2 O 3 -38 parts, siO 2 -34 parts, znO 18-24 parts, al 2 O 3 -9 parts, mgO 3-5 parts, 1-3 parts of rare earth oxide, nb 2 O 5 0.5.5-1.5 parts, tiO 2 -3 parts, hfO 2 0.3-1.2 parts and Ta 2 O 5 0.1-0.5 parts.
  2. 2. The silver paste for the vehicle-mounted glass antenna according to claim 1, wherein the rare earth oxide is compounded by La 2 O 3 、CeO 2 according to a mass ratio of 2:1.
  3. 3. The silver paste for a vehicle-mounted glass antenna according to claim 1, wherein the silane coupling agent is at least one of a silane coupling agent KH550, a silane coupling agent KH560, and a silane coupling agent KH 570.
  4. 4. The silver paste for a vehicle-mounted glass antenna according to claim 1, wherein the plate-like silver powder has a particle diameter of The particle diameter of the spherical silver powder is The diameter of the silver nanowire is 100-150nm.
  5. 5. The silver paste for vehicle-mounted glass antennas according to claim 1, wherein the organic carrier comprises, by weight, 12-20 parts of a composite resin, 65-78 parts of a mixed solvent, 6-12 parts of a composite rheology regulator, 3-6 parts of a dispersing agent and 1-3 parts of a film forming aid.
  6. 6. The silver paste for a vehicle-mounted glass antenna according to claim 5, wherein the composite resin is prepared by compounding ethyl cellulose, polyvinyl acetate and polyvinyl butyral resin according to a weight ratio of 3:2:1, wherein the weight average molecular weight of the polyvinyl acetate is 50000, and the weight average molecular weight of the polyvinyl butyral resin is 20000.
  7. 7. The silver paste for the vehicle-mounted glass antenna according to claim 5, wherein the mixed solvent is terpineol, glycol diethyl ether acetate and diethylene glycol butyl ether acetate, the weight ratio is 4:3:1, the composite rheological agent is hydrogenated castor oil, nano montmorillonite and polyamide wax, the weight ratio is 2:1:1, and the nano montmorillonite is DK0 polymer nano montmorillonite.
  8. 8. The silver paste for the vehicle-mounted glass antenna according to claim 5, wherein the dispersing agent is formed by compounding BYK-110, BYK-163 and BYK-2000 according to a weight ratio of 1:1:0.5, and the film forming auxiliary agent is polyethylene glycol monomethyl ether 2000.
  9. 9. The silver paste for the vehicle-mounted glass antenna according to claim 1, wherein the multifunctional composite additive is compounded by ZrO 2 、La 2 O 3 according to the weight ratio of (2-3) to 1, and the average particle size of the multifunctional composite additive is 50-100nm.
  10. 10. A process for producing a silver paste for a vehicle-mounted glass antenna according to any one of claims 1 to 9, comprising the steps of: Step S1, adding composite silver powder into ethanol, performing ultrasonic dispersion for 30min, adding a silane coupling agent according to the weight of 0.5-1.0% of the composite silver powder, stirring and reacting for 2h at the speed of 300r/min at the temperature of 60-70 ℃, filtering, and performing vacuum drying for 4h at the temperature of 80 ℃ to obtain the silane coupling agent surface modified composite silver powder; S2, mixing the components of the composite lead-free glass powder according to parts by weight, presintering and activating for 1h at 500-550 ℃, cooling and crushing to obtain the particle size Obtaining composite lead-free glass powder; And S3, uniformly mixing the silane coupling agent surface modified composite silver powder, the composite lead-free glass powder, the organic carrier and the multifunctional composite additive, sequentially grinding, curing, filtering by a 300-mesh stainless steel filter screen, filtering by a 5 mu m fine filter membrane, and bottling and sealing, wherein curing is specifically carried out for 24 hours in a vacuum environment at 25 ℃.

Description

Silver paste for vehicle-mounted glass antenna and production process thereof Technical Field The invention relates to the technical field of electronic paste, in particular to silver paste for a vehicle-mounted glass antenna and a production process thereof. Background With the rapid development of electric, intelligent and networking of automobiles, automobile glass has been upgraded from traditional wind and rain shielding functions to multifunctional integration directions, and novel products such as 5G antenna glass, ETC antenna glass, V2X networking antenna glass and the like have been developed. The silver paste for the vehicle-mounted glass antenna is used as a core conductive material of an antenna circuit, and the performance of the silver paste directly determines the signal receiving efficiency, the reliability and the service life of the antenna. The silver paste is required to form high-precision antenna patterns on the surface of glass by a screen printing technology, and realizes good conductivity, stable combination with a glass substrate and weather resistance in extreme environments after sintering. The silver paste market for the global vehicle-mounted glass antenna is mainly monopolized by DuPont, he Lishi and other international technologies, and the product has excellent performance but high price and the core technology is blocked. Although domestic enterprises break through in the field of silver paste for automobile glass antennas, obvious short plates exist in the field of silver paste for antennas, firstly, printing precision is insufficient, extremely fine line width printing requirements in the scenes of HUD head-up display, intelligent dimming glass and the like are difficult to meet, line edges are easy to diffuse and break, secondly, interface bonding strength is insufficient, thermal expansion coefficient matching performance of the silver paste and a glass substrate is poor, internal stress is easy to generate in a temperature cycle process, coating cracking and stripping are easy to cause, thirdly, environmental protection performance is required to be improved, partial products still contain harmful substances such as lead, and fourthly, comprehensive performance balance is poor, and conductivity, weather resistance and weldability are difficult to meet the use requirements of high-end vehicle-mounted antennas at the same time. In order to solve the problems, the invention patent application CN117690630A discloses a high-film-thickness conductive silver paste for a GPS ceramic antenna, and a preparation method and application thereof, wherein the conductive silver paste comprises, by weight, 75% -85% of conductive silver powder, 2% -4% of an organic binder, 3% -5% of an inorganic binder, 8% -18% of a solvent and 0.5% -1.5% of an auxiliary agent, and the conductive silver powder is spherical silver powder with a D50 particle sizeThe organic binder comprises one or more of ethyl cellulose, nitrocellulose, wood rosin, ethyl hydroxyethyl cellulose and acrylic resin, and the inorganic binder is lead-free glass powder with D50 particle size. Compared with the prior art, the conductive silver paste has large viscosity and high film thickness) The welding head is free from falling off, the welding strength is obviously enhanced, and meanwhile, the welding problem caused by 'eating silver' in a small device is improved, so that the welding head has better adaptability. However, the invention is designed aiming at the GPS ceramic antenna scene, does not consider the precision requirement of the vehicle-mounted glass antenna on ultra-fine linewidth printing, the requirement of the precise matching with the thermal expansion coefficient of a glass substrate and the long-term weather resistance and ion migration resistance under a severe temperature and humidity environment, and is difficult to adapt to the multifunctional integrated application scene of high-end vehicle-mounted glass antennas such as 5G/MIMO, V2X and the like. Therefore, developing silver paste for vehicle-mounted glass antenna with printing precision, conductivity, adhesive force, weather resistance and environmental protection is a key for breaking foreign monopoly and promoting the development of the domestic automobile glass antenna industry. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the silver paste for the vehicle-mounted glass antenna and the production process thereof, solves the technical problems of low printing precision, unstable interface combination, thermal expansion mismatch, poor environmental protection and the like of the traditional silver paste by multicomponent collaborative innovation and process optimization, and realizes the unification of high-precision printing, high conductivity, high weather resistance and environmental protection leadless of the silver paste. The silver paste for the vehicle-mounted glass antenna is prepared from the followin