Prepn process of flaky silver powder
A flake silver powder and a technology for silver powder are applied in the field of preparation of flake silver powder, and can solve the problems of complicated procedures, insufficient quality of silver powder, difficulty in producing various average particle sizes, etc.
Active Publication Date: 2007-12-19
CHINA BANKNOTE PRINTING & MINTING
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AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is: to solve the problems of complex procedures, insufficient silver powder quality and difficulty in producing series of flaky silver powders with various average particle diameters in the existing preparation method of flaky silver powder, and to provide a ball mill that adopts the existing ball mill, Under different milling time conditions, a series of flaky silver powders were obtained. The flaky silver powders can be used as raw materials for membrane switches and flexible circuit pastes, and all indicators can meet the requirements of membrane switches and flexible circuit pastes.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0024] Embodiment 1: choose the silver powder raw material 10kg that particle size is 5~7 microns, silver content is greater than 99.95%, cetyl alcohol 100g, also have the stainless steel ball 60kg that diameter is 3 millimeters, put into ball mill, dry milling frequency 50Hz; Ball mill 2 Observe after an hour to ensure that there is no powder sticking to the wall and no agglomeration; test during the ball milling process, and pass through a 40-mesh sieve in the hot state. The ball milling time was 12 hours, and flake silver powder with an average particle size of 5.21 microns was obtained.
Embodiment 2
[0025] Embodiment 2: The basic method is the same as in Embodiment 1, and the ball milling time is 15 hours to obtain flake silver powder with an average particle diameter of 6.32 microns.
Embodiment 3
[0026] Embodiment 3: The basic method is as in Embodiment 1, the ball milling time is 17 hours, and the average particle size is 7.32 microns of flake silver powder.
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Abstract
The preparation process of flaky silver powder belongs to the field of conducting material preparing technology. The preparation process includes ball milling silver powder material with silver content over 99.95 %, ball milling medium of 3 mm diameter stainless steel balls and ball milling stuffing of hexadecanol in 1 % in a ball mill in the frequency of 50Hz for 10-30 hr, detecting during ball milling, and hot state sieving in 40 mesh to obtain flaky silver powder of average powder size of 5-40 microns. The process can produce flaky silver powder of different average powder sizes.
Description
technical field [0001] The invention belongs to a method for preparing conductive materials, in particular to a method for preparing flake silver powder. Background technique [0002] Flake silver powder is mainly used as a conductive filler for conductive coatings, conductive inks, and polymer conductive silver pastes, such as for the production of electronic components such as flexible circuit boards and touch switches; it is used in monolithic capacitors, filters, carbon film potentiometers, tantalum The main functional materials of electronic components such as capacitors, membrane switches, and semiconductor chips. [0003] There are many known preparation methods about flake silver powder, which are divided into mechanical method and chemical method. Mechanical ball milling is divided into dry ball milling and wet ball milling. For example, if the planetary ball mill is used to produce flake silver powder by wet method, many additives are used, which will affect the ...
Claims
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IPC IPC(8): B22F9/04
Inventor 王自森杨玉祥汪云林詹刚王刚
Owner CHINA BANKNOTE PRINTING & MINTING