Preparation process of flaky silver powder

Abstract

A method for preparing flaky silver powder, which belongs to a method for preparing conductive materials, solves the problems of complex procedures, insufficient quality of the produced silver powder and difficulty in producing a series of flakes with various average particle sizes in the existing process for preparing flaky silver powder. The problem of silver powder, the method is to put the silver powder raw material, ball milling medium and ball milling filler into the ball mill for ball milling, the silver powder raw material is silver powder with a silver content greater than 99.95%, the ball milling medium is a stainless steel ball with a diameter of 3 mm, and the ball milling filler is 1% cetyl alcohol, control the ball milling time between 10 hours and 30 hours, during the ball milling time, the dry milling frequency is 50Hz; observe after 2 hours of ball milling to ensure that there is no powder sticking to the wall and no agglomeration; test during the ball milling process, Pass through a 40-mesh sieve in a hot state to obtain flake silver powder with an average particle size of 5-40 microns. It can be applied to the production of flake silver powder as conductive material, and a series of flake silver powder with average particle size can be obtained according to the difference of ball milling time.

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 ...

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 a series of silver powders with various average particle diameters in the existing process for preparing flaky silver powders, 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.