A kind of manufacturing method of the conductive silver powder that is used for touch screen uv type laser engraving silver paste

A technology of laser engraving and manufacturing method, which is applied in the field of silver powder for touch screen silver paste, can solve the problems of unsatisfactory use of UV-type laser engraving silver paste, rough surface of lines, large filling amount, etc., achieve excellent conductivity and photocuring effect, meet Electrical performance requirements, the effect of fast drying speed

Active Publication Date: 2017-08-25
湖南中锐新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the market demand for touch screen silver paste, silver paste is divided into capacitive screen silver paste, resistive screen silver paste, laser engraving silver paste and other commonly used types. In order to meet the needs of baking-type silver paste, flake silver powder is mainly used. In the UV system silver paste, it has the disadvantages of high photocuring energy, rough line surface, large filling amount and high resistance, which cannot meet the needs of UV laser engraving silver. use of pulp
However, in the preparation of silver powder reported in existing patents, the main purpose of the experiment is to prepare monodisperse or nano-scale silver powder, which cannot meet the special requirements of UV-type laser engraving silver paste for silver powder. The preparation method of silver powder for touch screen materials has not yet been disclosed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: a kind of manufacture method of the conductive silver powder that is used for touch screen UV type laser engraving silver paste, it is characterized in that: adopt precipitation transformation method to prepare fine powder, comprise following production steps:

[0032] (1) Accurately weigh 5kg of silver nitrate and 3kg of sodium carbonate, add 5kg of silver nitrate and 40kg of deionized water into the reaction kettle, stir and dissolve, keep the temperature at room temperature, and obtain a silver nitrate solution with a concentration of 0.5-1.0mol / L ;

[0033] (2) Dissolve 3kg of sodium carbonate in 20kg of deionized water to obtain a sodium carbonate solution with a concentration of 0.5-1.0mol / L, and then add the sodium carbonate solution into the reactor at a rate of 0.383kg / min to mix with silver nitrate The solution undergoes a chemical reaction, and the addition time is 60 minutes;

[0034] (3) After the addition is completed, adjust the temperature...

Embodiment 2

[0038] Embodiment 2: a kind of manufacture method of the conductive silver powder that is used for touch screen UV type laser engraving silver paste, it is characterized in that: adopt precipitation transformation method to prepare fine powder, comprise following production steps:

[0039] (1) Accurately weigh 5kg of silver nitrate and 3kg of sodium carbonate, add 5kg of silver nitrate and 40kg of deionized water into the reactor and stir to dissolve, keep the constant temperature at 60°C, and obtain silver nitrate with a concentration of 0.5-1.0mol / L solution;

[0040] (2) Dissolve 3kg of sodium carbonate in 20kg of deionized water to obtain a sodium carbonate solution with a concentration of 0.5-1.0mol / L, then add the sodium carbonate solution into the reaction kettle at a rate of 2.3kg / min and silver nitrate The solution undergoes a chemical reaction, and the addition time is 10 minutes;

[0041] (3) After the addition is completed, adjust the temperature to 80°C, pour 700...

Embodiment 3

[0045] Embodiment 3: a kind of manufacture method of the conductive silver powder that is used for touch screen UV type laser engraving silver paste, it is characterized in that: adopt precipitation transformation method to prepare fine powder, comprise following production steps:

[0046] (1) Accurately weigh 5kg of silver nitrate and 3kg of sodium carbonate, add 5kg of silver nitrate and 40kg of deionized water into the reactor and stir to dissolve, keep the constant temperature at 40°C, and obtain silver nitrate with a concentration of 0.5-1.0mol / L solution;

[0047] (2) Dissolve 3kg of sodium carbonate in 20kg of deionized water to obtain a sodium carbonate solution with a concentration of 0.5-1.0mol / L, then add the sodium carbonate solution into the reaction kettle at a rate of 0.575kg / min and silver nitrate The solution undergoes a chemical reaction, and the addition time is 40 minutes;

[0048] (3) After the addition is completed, adjust the temperature to 60°C, pour 3...

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Abstract

The invention relates to the field of conductive silver paste for touch screens, in particular to a method for preparing silver powder for touch screen UV-type silver pastes with PET as the base material. The method uses silver nitrate as the raw material and is based on the precipitation conversion method. According to the special performance requirements of the silver paste, by selecting different weak reducing agents, setting different reaction temperatures and different speeds of adding lye, it can be used without dispersants. Under certain circumstances, the differential control of silver powder agglomeration is realized, and its particle size is controlled within the range of 0.2-4μm, which meets the requirements of UV laser engraving silver paste printing fine lines.

Description

technical field [0001] The invention relates to the technical field of silver powder for touch screen silver paste, in particular to a preparation method of submicron silver powder for touch screen UV silver paste. Background technique [0002] Microelectronics products are trending towards miniaturization, integration and intelligence. In order to adapt to this trend, printed circuit technology is requiring finer and more precise circuits. To meet these needs, wires have become narrower and closer together. As a result, the requirements for conductive silver paste used in the electronics industry are getting higher and higher. Laser engraving silver paste is an important material in the electronics industry. It is prepared from silver powder, resin, and organic solvent in a certain ratio. There are many factors that affect its performance, but silver powder is the most critical material to form conductive silver paste. [0003] At present, the quality of laser engraving...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 何伟雄田志林
Owner 湖南中锐新材料技术有限公司
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