Method for preparing high-dispersion silver powder for photoetching touch screen silver paste
A touch screen, high-dispersion technology, applied in the field of preparation of high-dispersion silver powder, can solve the problems of wide particle size distribution, inability to engrave, poor dispersibility, etc., and achieves excellent conductivity and other performance parameters, simple production process, and improved adhesion. Effect
Inactive Publication Date: 2016-03-09
昆明银科电子材料股份有限公司
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Problems solved by technology
The second type of silver powder is used in the laser engraving process to form silver lines with a line width between 20 and 30 microns. The extremely thin lines put forward higher requirements for the performance of the silver powder, that is, the particle size of the silver powder must be fine enough and the dispersion must be good, otherwise Even if there is only a very small amount of coarse particles, it will cause the engraving to not be removed during the laser engraving process, which will eventually reduce the yield rate of the touch screen
It is precisely because of the poor dispersion of domestic silver powder and the wide range of particle size distribution that the domestic silver powder is completely unsuitable for the needs of laser engraving technology.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0023] Accurately weigh 8 kg of silver nitrate and 5 kg of sodium hydroxide, add silver nitrate and 80 liters of deionized water into the reactor and stir to dissolve, dissolve sodium hydroxide in 5 liters of water, then quickly add it into the reactor for chemical reaction, and the reaction is completed After that, weigh 1 kg of hydrazine hydrate and add 2 liters of water to dilute it, and then drop it into the reaction kettle for 40 minutes to carry out the reduction reaction. During the whole reaction process, the temperature of the reaction system was kept constant at 35±2° C. by adding ice cubes to the reaction solution. After the reaction is completed, the material is discharged and cleaned, and the conductivity of the lotion is detected to be less than 20 μs / cm, and then dehydrated to a moisture content of less than 50%. Put the reduced silver powder, hydrophilic surface modifier, deionized water, and grinding media into the ball mill at a weight ratio of 100:0.8:150:60...
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Abstract
The invention relates to a method for preparing high-dispersion silver powder for photoetching touch screen silver paste, and belongs to the technical field of conductive metal powder preparing. The method includes the steps of reduced silver powder preparing, reduced silver powder surface modification, ball milling, airflow grading and the like. The method has the beneficial effects that a reaction system is kept at the constant temperature of 35+ / -2 DEG C in the manner that ice blocks are added into a reaction solution, so that the problems that a large amount of heat is emitted in the chemical reaction process, the temperature rises sharply, and silver powder is badly accumulated are solved; the size of a grinding medium is 1 mm, accumulated particles in the reduced silver powder can be sufficiently dispersed, the conductivity of the silver powder in slurry can be improved, and the adhesive force of the silver powder to a base material can be increased; and the prepared high-dispersion superfine silver powder with the largest particle size smaller than 4 microns is particularly suitable for laser engraving of the touch screen silver paste with the line width within the range from 20 microns to 30 microns, conductivity and other performance parameters are excellent, the production technology is simple, cost is low, and industrial production can be achieved.
Description
Technical field: [0001] The invention relates to a method for preparing high-dispersion silver powder for photoetching touch screen silver paste, and belongs to the technical field of conductive metal powder preparation. Background technique: [0002] Touch screens originated in the 1970s, and were mostly installed in industrial or commercial equipment such as industrial computers and POS terminals in the early days. The launch of the iPhone in 2007 became a milestone in the development of the touch industry. Apple designed a mobile phone that requires at least 20 buttons to be done with only three or four buttons, and the rest of the operations are all completed by the touch screen. In addition to giving users a more direct and convenient operating experience In addition, it also makes the appearance of the mobile phone more fashionable and thinner, increases the intimacy of direct human-computer interaction, arouses the enthusiastic pursuit of consumers, and also starts t...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B22F9/04
CPCB22F9/04B22F2009/043
Inventor 杨荣春毛俊唐天安
Owner 昆明银科电子材料股份有限公司