Silver powder with flower-shaped microstructure and preparation method thereof and electric conducting ink

A technology of microstructure and conductive ink, which is applied in the direction of ink, household utensils, nanotechnology, etc., can solve the problems of non-conductive printing, printing accuracy, insufficient curing of conductive ink, and prolonged curing time, etc., and achieve fine feature size , uniform size, and improved conductivity

Active Publication Date: 2017-02-22
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of increasing the content of conductive filler, especially when high-speed printing is performed, transfer errors or friction are prone to occur, resulting in problems such as non-conduction after curing, printing accuracy, etc.
In addition, for light-curable conductive inks, when the content of conductive fillers increases, ultraviolet rays cannot reach the entire conductive ink during the curing stage, resulting in insufficient curing of the printed conductive ink or prolonged curing time, which brings problems in printed circuit mechanics. Problems with performance and adhesion to substrate materials

Method used

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  • Silver powder with flower-shaped microstructure and preparation method thereof and electric conducting ink
  • Silver powder with flower-shaped microstructure and preparation method thereof and electric conducting ink
  • Silver powder with flower-shaped microstructure and preparation method thereof and electric conducting ink

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preparation example Construction

[0020] This specific embodiment provides a kind of preparation method of silver powder, comprises the following steps:

[0021] S1, respectively prepare a precursor solution, a first reducing agent solution, a surfactant solution, a silver salt solution and a second reducing agent solution.

[0022] Wherein, the molar concentration ratio of the precursor salt solution, the first reducing agent solution, the surface active solution, the silver salt solution and the second reducing agent solution is 1:0.1-10:0.05-50:0.1-5:0.1-10. Anions in the precursor solution can form complex precursors with silver ions. The first reducing agent solution is a weak reducing agent solution, such as a mixture of one or more of formaldehyde, acetaldehyde, citric acid, and ascorbic acid. The second reducing agent solution is selected from a reducing agent solution with stronger reducibility than the first reducing agent solution, such as formaldehyde, acetaldehyde, ascorbic acid, sodium borohydri...

Embodiment 1

[0038] The preparation method of silver powder in the present embodiment comprises the following steps: (1) getting 1L concentration respectively is the sodium citrate solution of 0.24mol / L, 1L concentration is the formaldehyde solution (the first reductant solution) of 37wt% and 2L concentration is 1wt% % Tween-80 solution (sorbitan ester surfactant), and add in the reaction vessel and stir; In the above-mentioned reaction vessel, stir with stirring speed 200 revs per minute, make silver salt precursor solution after reacting for 30 minutes; (3) in the silver salt precursor solution of step (2) gained, drop speed 0.5L / Add 1 L of sodium borohydride solution (the second reducing agent solution) with a concentration of 0.24 mol / L in min, stir at a stirring speed of 500 rpm, adjust the pH to 10.0, continue the reaction at 25° C. for 30 minutes, and then stop the reaction; ( 4) The precipitate is filtered, washed and dried in vacuum to obtain silver powder.

[0039] Such as fig...

Embodiment 2

[0042] The preparation method of silver powder in the present embodiment comprises the following steps: (1) get 1L concentration respectively and be the sodium citrate solution of 0.48mol / L, 1L concentration be the ascorbic acid solution (the first reducing agent solution) of 0.48mol / L and 1L 1wt % Tridaton X-100 solution (polyoxyethylene ether surfactant solution), and add in the reaction vessel and stir evenly; Drop rate is added in the above-mentioned reaction vessel, stirs with stirring speed 200 revs per minute, makes silver salt precursor solution after reacting for 30 minutes; Add 1 L of 0.48 mol / L hydrazine hydrate solution (the second reducing agent solution) at 0.3 L / min, stir at a stirring speed of 350 rpm, adjust the pH to 10.0, and continue the reaction at 0°C for 30 minutes before stopping the reaction; (4) The precipitate is filtered, washed and dried in vacuum to obtain silver powder.

[0043] Such as figure 2 Shown is the SEM picture of the prepared silver ...

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Abstract

The invention discloses silver powder with a flower-shaped microstructure and a preparation method thereof and electric conducting ink. The preparation method of the silver powder comprises the following steps: (S1) precursor solution, first reducing agent solution, surface active agent solution, silver salt solution and second reducing agent solution are respectively prepared; (S2) the precursor solution, the first reducing agent solution and the surface active agent solution are poured in a reaction container for uniform stirring; (S3) the silver salt solution is added in the reaction container with a dripping speed of 0.01-1 L / min, and is stirred with a stirring speed of 0.01-1 L / min to prepare silver salt precursor solution after full reaction; (S4) the second reducing agent solution is added in the silver salt precursor solution with a dripping speed of 0.01-1 L / min, and is stirred with a stirring speed of 10-1000 rpm to prepare precipitates after full reaction; and (S5) the precipitates are filtered, washed and dried in vacuum to prepare the silver powder. The prepared silver powder is applied to the electric conducting ink to improve the electric conductivity of the electric conducting ink; and the electric conducting ink is better in printing property and printing precision.

Description

[0001] 【Technical field】 [0002] The invention relates to a method for preparing silver powder, in particular to a method for preparing silver powder with a flower-like microstructure. [0003] 【Background technique】 [0004] In recent years, the rapid rise of flexible circuit boards, radio frequency identification systems (RFID), membrane switches, and thin film resistors has promoted the rapid development of conductive ink technology. Using flexographic printing, offset printing, gravure printing and other technologies, the printing method of ink curing by ultraviolet light or electron beam is attracting extensive attention from the scientific and industrial circles. At present, in order to achieve good conductivity, a common method is to form a better conductive network path by increasing the amount of conductive filler added in the conductive ink. In the case of increasing the content of conductive filler, especially when high-speed printing is performed, transfer errors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00C09D11/52C09D11/101
CPCB22F9/24B82Y40/00C09D11/101C09D11/52
Inventor 杨诚邓玉斌吴铛杨瑞
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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