Title:
PREPARATION METHOD USING MICRO-NANO BUBBLES AS CRYSTAL SEEDS TO INDUCE SILVER POWDER PRODUCTION
Document Type and Number:
WIPO Patent Application WO/2017/190712
Kind Code:
A9
Abstract:
A preparation method using micro-nano bubbles as crystal seeds to induce spherical or spherical-type silver powder production, said method specifically comprising the steps of: pre-adding a prepared dispersing agent solution to a reaction vessel, starting a micro-nano bubble generator, producing controllable micro-nano bubbles (0.1nm-900nm) in the dispersing agent solution within the reaction vessel, simultaneously adding a prepared oxidising solution (an aqueous solution containing silver ions or a silver ammonia solution) and a reducing solution (an aqueous solution containing one or a plurality of hydroxylamine compounds, vitamin C, formaldehyde or hydrazine hydrate), performing a reduction reaction under vigorous stirring, and using the pre-generated micro-nano bubbles within the dispersing agent solution as crystal seeds, the micro-nano bubble crystal seeds effectively controlling the particle size of reduced silver particles throughout the reduction reaction. The method effectively controls the particle size of the silver powder during production, and also controls the crystal nucleus growth rate and dispersibility. The produced silver powder has excellent crystallinity and sphericity, high tap and high dispersibility, and in particular, the silver powder particle internal loose structure significantly aids the activity of the silver powder.
Inventors:
GONG QIANG (CN)
Application Number:
PCT/CN2017/088534
Publication Date:
December 21, 2017
Filing Date:
June 15, 2017
Export Citation:
Assignee:
SUZHOU SMART ADVANCED COATING TECH CO LTD (CN)
International Classes:
B22F9/24; B22F9/00; B22F9/18; B22F1/05
Attorney, Agent or Firm:
SUZHOU CREATOR PATENT AND TRADEMARK AGENCY LTD. (CN)
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