Preparation method of silver powder for laser etching silver paste for touch screen

A laser etching and touch screen technology, which is applied in the field of conductive metal powder preparation, can solve the problems of difficult concentration of silver powder particle size, poor dispersion of silver powder, and uncontrollable particle size, and achieve high concentration of powder particle size and low cost. Low, equipment requirements are not high

Inactive Publication Date: 2018-12-18
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing silver powder for laser etching silver paste for touch screens, so as to solve the problems that the particle size of silver powder is difficult to concentrate, the size of particles cannot be controlled, and the dispersion of silver powder is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] A method for preparing silver powder for laser etching silver paste for a touch screen, comprising the steps of:

[0026] Step 1. Dissolve the reducing agent in pure water to obtain reducing agent solution A, and adjust the temperature to 45±5°C;

[0027] Step 2. Dissolve the dispersant in pure water, add alkali to adjust the pH value to 12.0-13.0 to obtain dispersant solution B, and adjust the temperature to 45±5°C;

[0028] Step 3, dissolving silver nitrate in pure water to obtain metal salt solution C, and adjusting the temperature to 45±5°C;

[0029] Step 4. Add the dispersant solution B obtained in step 2 and the metal salt solution C obtained in step 3 into the reducing agent solution A obtained in step 1 and stir for 3-5 minutes;

[0030] Step 5. Wash the mixed solution obtained in step 4 until the conductivity of the filtrate is ≤ 20ms, and obtain a filter cake after solid-liquid separation, add hydrophobic additives to the filter cake, and dry until the moistu...

Embodiment 1

[0040] Weigh 176.82g of hydrazine hydrate and dissolve it in 1L of pure water for later use as reducing agent solution A, and adjust the temperature to 45°C;

[0041] Dissolve 68g of sodium hydroxide and 2.10g of benzotriazole acid in 1L of pure water for use as dispersant solution B, and adjust the temperature to 45°C;

[0042] Weigh 300g of silver nitrate and dissolve it in 0.5L of water as metal salt solution C, and adjust the temperature to 45°C;

[0043] Quickly pour the dispersant solution B and the metal salt solution C into the reducing agent solution A under stirring for reaction, control the pouring time within 10s, and stir, pour all the dispersant solution B into the reaction for 3 minutes, and detect the reaction solution Ag-free + When the reaction is judged to be over;

[0044] The obtained solution is subjected to solid-liquid separation and filtration, and after several washings until the conductivity of the filtrate is ≤20ms, the solid-liquid separation and...

Embodiment 2

[0047] Weigh 527.23g of ascorbic acid and dissolve it in 3.2L of pure water for later use as reducing agent solution A, and adjust the temperature to 50°C;

[0048]Weigh 216g of sodium hydroxide and 1.75g ​​of benzotriazole acid and dissolve them in 3.2L of water for later use as dispersant solution B and adjust the temperature to 50°C;

[0049] Weigh 250g of silver nitrate and dissolve it in 0.4 L of water as metal salt solution C, and adjust the temperature to 50°C;

[0050] Quickly pour the dispersant solution B and the metal salt solution C into the stirring reducing agent solution A to react, control the pouring time within 10s, and stir, pour all the dispersant solution B into the reaction for 5 minutes, and detect the reaction solution Ag-free + When the reaction is judged to be over;

[0051] Carry out solid-liquid separation and filtration of the obtained solution, and perform solid-liquid separation and filtration after several washings until the conductivity of th...

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Abstract

The invention discloses a preparation method of silver powder for laser etching silver paste for a touch screen, and belongs to the technical field of preparation of conductive metal powder. The preparation method comprises the following steps that a reducing agent solution, a dispersant solution and a metal salt solution are prepared, the solutions are subjected to mixing reaction and washed to reach the conductivity to be less than or equal to 20ms, solid-liquid separation is performed to obtain a filter cake, and the filter cake is dried until the moisture content is less than 0.2% to obtain the silver powder. The preparation method is simple in operation, wide in source of raw materials, low in cost and low in requirements on equipment; and the obtained preparation method of the silverpowder for laser etching silver paste for the touch screen has a high powder particle size concentration degree, the maximum particle size D100 of the silver powder is less than 5[mu]m, and good dispersibility is achieved.

Description

technical field [0001] The invention belongs to the technical field of conductive metal powder preparation, and in particular relates to a method for preparing silver powder for laser etching silver paste for touch screens. Background technique [0002] The touch screen originated in the United States in the 1960s and was developed by the US military for military use. After more than 50 years of development, touch screens have been widely used now, but they really entered a mature period after 2000. In 2007, the first-generation iPhone opened the prelude to the full touch era of smartphones, and became a milestone in the development of the touch industry. In 2010, with the explosive growth of smart phones and the emergence of tablet computers, the core position of touch operations, especially capacitive touch operations, on smart mobile terminals was confirmed. The release of the first-generation iPad made the touch screen competition expand from small to medium and large-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 曹笃盟杨荣春齐勇马骞范秀娟王维斌孟涛任哲峥包飞燕王媛媛张亚红吴婧
Owner JINCHUAN GROUP LIMITED
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