The invention discloses a preparation method for a micro-order platy silver
powder, which comprises the following steps: preparing 10-180g / L AgNo3
aqueous solution, and regulating the pH value to be 2.0-5.0; (2) preparing 12 / 204g / L
ascorbic acid aqueous solution; (3) preparing dilute sulphuric acid or soluble
sulfate solution, wherein the
mass of
sulfate ions is 0.3-1.5 times that of AgNO3; (4) at 10-60 DEG C under stirring state, mixing the dilute sulphuric acid or soluble
sulfate solution and the
reducing agent ascorbic acid aqueous solution with certain volume into certain volume of
silver nitrate solution for reaction for 3-6 minutes, standing for 5-300 minutes and carrying out liquid-
solid separation; and (5) rinsing the
solid product obtained from the step (4) with deionized water and absolute ethyl
alcohol respectively until the pH of the cleaning solution is neutral, and
drying at 30-65 DEG C for 1.5-5 hours, thus obtaining the micro-order platy silver
powder product. By adopting the preparation method, the micro-order platy silver
powder which has a width-to-thickness ratio larger than or equal to 10 and plate
diameter of 5-50mum; and the preparation method omits the
grinding procedure of the traditional
machine, is simple in technique, easy to operate, and low in cost and has no
pollution to the environment.