CN-121988737-A - Surface-treated silver-containing conductive powder and preparation method and application thereof

Abstract

The invention relates to the technical field of powder surface modification and functional modification, in particular to silver-containing conductive powder for surface treatment, and a preparation method and application thereof, wherein the preparation method comprises the steps of mixing an alcohol solvent, water, a silane coupling agent and an organic acid catalyst, and mixing the obtained hydrolysate with the silver-containing conductive powder to obtain modified conductive powder; mixing stearic acid with an organic solvent, and mixing the obtained coating liquid with modified conductive powder to obtain the surface-treated silver-containing conductive powder. Different kinds of silane coupling agents are combined on the surface of the silver-containing conductive powder in a chemical bond mode by utilizing wet modification so as to adapt to different base material systems; the surface of the modified conductive powder is coated with stearic acid for the second time, so that the dispersibility of the silver-containing conductive powder in each system is greatly improved, the aggregation of the silver-containing conductive powder is reduced, and the powder aggregation caused by capillary action is reduced by the treatment method, so that the surface treatment of the submicron-level to micron-level silver-containing conductive powder is realized.

Inventors

• DENG WEIDA
• LIU GUANGPING
• LIN XIANGTIAN

Assignees

• 深圳市飞荣达科技股份有限公司

Dates

Publication Date

20260508

Application Date

20260210

Claims (10)

1. 1. The preparation method of the surface-treated silver-containing conductive powder is characterized by comprising the following steps: mixing an alcohol solvent, water, a silane coupling agent and an organic acid catalyst, and carrying out hydrolysis reaction to obtain a hydrolysate; Mixing silver-containing conductive powder with the hydrolysate, and carrying out a conductive powder modification reaction to obtain modified conductive powder; mixing stearic acid with an organic solvent to obtain a coating solution; and mixing the modified conductive powder with the coating liquid, and carrying out coating reaction to obtain the surface-treated silver-containing conductive powder.
2. 2. The method for preparing the surface-treated silver-containing conductive powder according to claim 1, wherein the alcohol solvent is one or more selected from methanol, ethanol and isopropanol, the silane coupling agent is one or more selected from mercaptopropyl trimethoxysilane, mercaptopropyl triethoxysilane, gamma-glycidol ether oxypropyl trimethoxysilane, gamma-aminopropyl triethoxysilane, vinyltriethoxysilane, gamma-methacryloxypropyl methyldimethoxysilane, n-dodecyl triethoxysilane and hexadecyl trimethoxysilane, and the organic acid catalyst is one or more selected from formic acid and acetic acid.
3. 3. The method for preparing a surface-treated silver-containing conductive powder according to claim 1, wherein the mass ratio of the alcohol solvent to water is (1-10) 1, and the silane coupling agent is added in an amount of 0.5wt% to 8wt% based on the mass of the silver-containing conductive powder.
4. 4. The method for preparing a surface-treated silver-containing conductive powder according to claim 1, wherein the stirring rate of the hydrolysis reaction is 20rpm-50rpm, the temperature of the hydrolysis reaction is 20 ℃ to 30 ℃, and the time of the hydrolysis reaction is 10min-120min.
5. 5. The method for preparing the surface-treated silver-containing conductive powder according to claim 1, wherein the silver-containing conductive powder is one or more selected from the group consisting of silver powder, silver-coated aluminum powder, silver-coated copper powder, silver-coated nickel powder, and silver-coated glass powder.
6. 6. The method for producing a surface-treated silver-containing conductive powder according to claim 1, wherein the mass ratio of the silver-containing conductive powder to the hydrolysate is (0.2-2): 1, and the mass ratio of the modified conductive powder to the coating liquid is (1-2): 1.
7. 7. The method for preparing the surface-treated silver-containing conductive powder according to claim 1, wherein the stirring rate of the conductive powder modification reaction is 50rpm-150rpm, the temperature of the conductive powder modification reaction is 60 ℃ to 120 ℃, and the time of the conductive powder modification reaction is 120min-480min.
8. 8. The method for preparing the surface-treated silver-containing conductive powder according to claim 1, wherein the stearic acid is one or more selected from the group consisting of octadecyl stearic acid and hexadecyl stearic acid, and the amount of the stearic acid added is 0.5wt% to 2wt% of the mass of the silver-containing conductive powder.
9. 9. A surface-treated silver-containing conductive powder, characterized by being produced by the surface-treated silver-containing conductive powder production method according to any one of claims 1 to 8.
10. 10. Use of the surface-treated silver-containing conductive powder according to claim 9 in a conductive paste.

Description

Surface-treated silver-containing conductive powder and preparation method and application thereof Technical Field The invention relates to the technical field of powder surface modification and functional modification, in particular to silver-containing conductive powder for surface treatment and a preparation method and application thereof. Background The conductive adhesive is a composite material formed by combining conductive powder and organic resin (epoxy, silicone rubber and the like), and an effective shielding body is constructed mainly through sealing and bonding to play a role of shielding. The traditional conductive adhesive is mainly made of nickel-based materials, and with the increasing requirement of shielding, the ultrahigh conductivity of silver enables the conductive adhesive to be increasingly applied to a conductive adhesive system. In order to balance the cost and the performance, silver-containing conductive powders such as silver-coated aluminum powder, silver-coated copper powder, silver-coated nickel powder, silver-coated glass powder and the like are widely applied to automobile conductive adhesives. However, silver powder is high in surface energy and hydrophilic, and organic resin is low in surface energy and hydrophobic, and this difference causes aggregation of silver-containing powder, uneven dispersion in the resin, weak interface bonding with the resin, and the like, and particularly, the case of powder with small particle size such as submicron order is serious. In order to improve the compatibility, it is necessary to surface-treat the silver powder. The current mainstream silver powder surface treatment method is to modify silver powder by using dispersing agents or surfactants in the process of synthesizing silver powder through oxidation reduction, and belongs to the field of chemical synthesis and production difficulty. And more modified silver powder is prepared for conductive silver paste, which is not universal for other systems and other conductive powder containing silver. Accordingly, the prior art is still in need of improvement and development. Disclosure of Invention In view of the shortcomings of the prior art, the invention aims to provide a silver-containing conductive powder with surface treatment, and a preparation method and application thereof, and aims to solve the problems that the existing silver-containing conductive powder cannot be adapted to different base material systems and has poor dispersibility. The technical scheme of the invention is as follows: a preparation method of surface-treated silver-containing conductive powder comprises the following steps: mixing an alcohol solvent, water, a silane coupling agent and an organic acid catalyst, and carrying out hydrolysis reaction to obtain a hydrolysate; Mixing silver-containing conductive powder with the hydrolysate, and carrying out a conductive powder modification reaction to obtain modified conductive powder; mixing stearic acid with an organic solvent to obtain a coating solution; and mixing the modified conductive powder with the coating liquid, and carrying out coating reaction to obtain the surface-treated silver-containing conductive powder. The preparation method of the surface-treated silver-containing conductive powder comprises the steps of selecting one or more of methanol, ethanol and isopropanol as an alcohol solvent, selecting one or more of mercaptopropyl trimethoxy silane, mercaptopropyl triethoxy silane, gamma-glycidol ether oxypropyl trimethoxy silane, gamma-aminopropyl triethoxy silane, vinyl triethoxy silane, gamma-methacryloxypropyl methyl dimethoxy silane, n-dodecyl triethoxy silane and hexadecyl trimethoxy silane as a silane coupling agent, and selecting one or more of formic acid and acetic acid as an organic acid catalyst. The preparation method of the surface-treated silver-containing conductive powder comprises the steps of (1-10) mixing an alcohol solvent with water, wherein the mass ratio of the alcohol solvent to the water is 1, and the addition amount of the silane coupling agent is 0.5-8 wt% of the silver-containing conductive powder. The preparation method of the surface-treated silver-containing conductive powder comprises the steps of stirring the surface-treated silver-containing conductive powder at a speed of 20rpm-50rpm, hydrolyzing at a temperature of 20-30 ℃ for 10-120 min. The preparation method of the surface-treated silver-containing conductive powder comprises the step of preparing the surface-treated silver-containing conductive powder, wherein the silver-containing conductive powder is one or more selected from silver powder, silver-coated aluminum powder, silver-coated copper powder, silver-coated nickel powder and silver-coated glass powder. The preparation method of the surface-treated silver-containing conductive powder comprises the steps of (0.2-2) and (1) the mass ratio of the silver-containing conductive powder to the hydrolysate, and (