Preparation method of aluminum silver paste

Abstract

The invention discloses a preparation method of aluminum silver paste. The preparation method comprises the following steps of: putting aluminum powder with stipulated particle size, grinding aid and liquid nitrogen into a vibrating mill which is heat-insulation under the state of bearing the pressure intensity of 6MPa according to certain proportion; grinding for 3-6 hours; vibrating and grinding into a mixture of liquid nitrogen and sheet-shaped aluminum powder; injecting a solid and liquid mixture into a vortrap at high flowing speed through a pump, wherein the mixture (of liquid nitrogen and sheet-shaped aluminum powder) which does not achieve the fine degree returns to the vibrating mill and is grinded continuously; inputting the sheet-shaped aluminum powder with the mass percentage less than 10% of the liquid nitrogen into a stirring container with certain pressure intensity and temperature; injecting solvents and aids required to be mixed in according to proportion; and then stirring and mixing uniformly; and gasifying and discharging the liquid nitrogen, thereby obtaining the aluminum silver paste product in the stirring container. The preparation method of the aluminum silver paste provided by the invention has the advantages that the aluminum silver paste is produced continuously in the liquid nitrogen protection atmosphere, so that the fire disaster hazard of the production process is eliminated; and aluminum powder is grinded by adopting the vibrating mill with high efficiency, and the vibrating mill can save 2 / 3 of time compared with a ball mill under the same specification and yield, the solvent damage and solvent oil abandoning are avoided, and no pollutant is discharged.

Description

technical field [0001] The invention relates to a method for preparing aluminum-silver paste, which belongs to the technical field of metal pigments. Background technique [0002] The production method of the current aluminum silver paste is to mix metal aluminum powder with a certain particle size, solvent oil (No. 150 solvent oil, No. 200 solvent oil, aviation kerosene, etc.) 15mm grinding balls (steel balls, corundum balls, glass balls, etc.) are wet-ground into flake aluminum powder slurry. After testing to a certain particle size and thickness, the slurry is put into a vibrating screen for screening to separate different particle size specifications. flake aluminum powder slurry, and then use a centrifuge or filter press for solid-liquid separation to separate most of the solvent used for grinding in the flake aluminum powder slurry, and then adjust and add solvents and additives for blending and stir through a kneader Even and meet the requirements of a certain specif...

AI Technical Summary

Problems solved by technology

The production method of this kind of aluminum silver paste is discontinuous, and the grinding output of the ball mill is low, the grinding time is long, the energy consumption is high, and the yield is low; a large number of volatile and flammable solvents are used openly, and there is waste solvent oil. The flake aluminum powder in the slurry and the volatile and flammable solvent mixture are continuously exposed to the air from the ball mill, vibrating screen, filter press, and agitator, which is a fire hazard.