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Method for preparing silver powder for touch screen silver paste

A touch screen and silver powder technology, which is applied in the field of preparation of silver powder for touch screen silver paste, can solve the problems of dependence on imports, and achieve the effect of high crystallinity

Inactive Publication Date: 2013-03-13
云南铜业科技发展股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the domestic silver paste and silver powder products used in matching touch screens are almost blank, and more than 95% of them rely on imports.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Accurately weigh 8kg of silver nitrate and 5.5kg of sodium hydroxide, add silver nitrate and 50 liters of deionized water together to stir and dissolve in the reactor, dissolve sodium hydroxide in 5 liters of water, then drop them into the reactor for chemical reaction, drop Add time is 20 minutes. After the sodium hydroxide is added dropwise, adjust the temperature to 50° C., weigh 2.7 kg of formaldehyde and add 2 liters of water to dilute, and then pour it into the reaction kettle at one time to carry out the reduction reaction. After the reaction is completed, the material is discharged and cleaned. After detecting that the conductivity of the lotion is less than 20 μs / cm, it is dehydrated until the water content is less than 50%. Take 15g of oleic acid and 30g of graft copolymer dispersant, add 500g of absolute ethanol to dissolve, and then add 300nm quasi-spherical Or spherical particles of reduced silver powder, stirred evenly, and equally divided into 4 stainless...

Embodiment 2

[0023] Accurately weigh 8kg of silver nitrate and 5.5kg of sodium hydroxide, add silver nitrate and 50 liters of deionized water together to stir and dissolve in the reactor, dissolve sodium hydroxide in 5 liters of water, then slowly drop into the reactor for chemical reaction, The dropwise addition time was 30 minutes. After the sodium hydroxide is added dropwise, adjust the temperature to 20°C, then weigh 2.7kg of formaldehyde, add 2 liters of water to dilute, and then pour it into the reaction kettle at one time to carry out the reduction reaction. After the reaction is completed, the material is discharged and cleaned. After detecting that the conductivity of the lotion is less than 20 μs / cm, it is dehydrated until the water content is less than 50%. Take 15g of stearic acid and 30g of polyacrylate dispersant, add 500g of absolute ethanol to dissolve, and then add 500nm Stir evenly in the reduced silver powder with quasi-spherical or spherical particles, and equally distr...

Embodiment 3

[0025] Accurately weigh 8kg of silver nitrate and 5.5kg of sodium hydroxide, add silver nitrate and 50 liters of deionized water together to stir and dissolve in the reactor, dissolve sodium hydroxide in 5 liters of water, then slowly drop into the reactor for chemical reaction, The dropwise addition time was 60 minutes. After the sodium hydroxide is added dropwise, adjust the temperature to 30°C, then weigh 2.7kg of formaldehyde, add 2 liters of water to dilute, then add dropwise to the reactor for reaction, and the dropwise addition time is about 20 minutes. After the reaction is completed, the material is discharged and cleaned. After detecting that the conductivity of the lotion is less than 20μs / cm, dehydrate until the water content is less than 50%. Take 15g of cetyl alcohol and 30g of graft copolymer dispersant, add 500g of absolute ethanol to dissolve, and then add 800nm The quasi-spherical or spherical particles of the reduced silver powder are stirred evenly, and th...

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PUM

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Abstract

The invention relates to a method for preparing silver powder for a touch screen silver paste and belongs to the technical field of preparation of conductive metal powder. The method comprises the following steps: using silver nitrate as a raw material and controlling the speed of liquid phase reduction reaction by regulating the process conditions of reaction temperature, charging manner and charging speed so as to prepare approximately spherical or spherical particle reduced silver powder with a particle size of 300 nm to 800 nm; sufficiently stirring and modifying the silver powder in absolute ethyl alcohol solution containing two modifiers of oleic acid, stearic acid, hexadecanol, a polyacrylate dispersing agent and a graft copolymer dispersing agent, carrying out batching on the obtained modified silver powder and phi3 stainless steel beads according to a mass ratio of 1:10 after drying at a temperature of 60 DEG C, and grinding for 10 to 24 hours; and after finishing grinding, carrying out bead and material separation, sieving the obtained silver powder by 300 meshes to obtain the high dispersion approximately spherical or spherical silver powder with D50 of 1.5 to 2.5mum and tap density of 4.0 to 6.0 g / cm<3>. The silver powder prepared by the method disclosed by the invention has high crystallinity, is suitable for an addition volume of silver of 70 to 85 percent and can be used for printing capacitive screen silver paste of a thin wire with a specification below 80 mum.

Description

Technical field: [0001] The invention relates to a preparation method of silver powder for touch screen silver paste, belonging to the field of preparation of conductive metal powder. 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 the journey of touch screen to the mai...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00
Inventor 徐茂黄娜蒋和军杨定广王勤范政纪云腾禹建敏
Owner 云南铜业科技发展股份有限公司
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