Preparation method of high-brightness nano-scale flakey aluminum powder

Abstract

The invention discloses a preparation method of high-brightness nano-scale flakey aluminum powder, which comprises the following steps: firstly, heating aluminum rods under vacuum to evaporate the aluminum rods on a soluble film substrate to form a nano-scale aluminum film; dissolving the soluble film substrate with a solvent to separate the nano-scale aluminum film from the soluble film substrate, and carrying out stirring and centrifugal separation to obtain nano-scale flakey aluminum powder; and conducting drying and surface modification on the nano-scale flakey aluminum powder to obtain the high-brightness nano-scale flakey aluminum powder. The preparation method adopts a continuous production process; the preparation time is about one hour; the thickness of the prepared high-brightness nano-scale flakey aluminum powder can be precisely controlled; the thicknesses of all points on a powder flake are substantially uniform; the surface of the aluminum powder is flat and smooth; the thickness ranges from 30 to 100 nm; the diameter ranges from 0.1 to 3 [mu]m; the radius-thickness ratio ranges from 30 to 900; the brightness is higher than 120Gs; the light reflectivity is higher than 91%; and the water surface covering power is higher than 12m<2> / g.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a preparation method of high-brightness nanoscale flake aluminum powder. Background technique [0002] Flake aluminum powder, also known as aluminum silver powder, has the characteristics of good dispersibility, strong adhesion, vivid color similar to silver, good light reflection effect and long-lasting brightness, etc. It is widely used in decoration, decoration, packaging, color printing, automobiles, motorcycles and other fields . Considering the brightness, metallic feeling, flash effect, directional migration and water covering power of flake aluminum powder, the thickness of flake aluminum powder should be controlled within 30-50nm. This kind of flake aluminum powder with a thickness of nanometers, due to the volume effect (that is, the small size effect) and the surface effect, makes its water surface covering power extremely high, and its dispersion is very good. In addit...

AI Technical Summary

Problems solved by technology

However, the use of this process to produce flake aluminum powder has the following disadvantages: one is that during the ball milling process, as the particle size of the aluminum powder decreases, the surface of the aluminum powder is easily oxidized and becomes dark or even black; the other is due to the limitation of the aluminum powder classification technology , the traditional ball milling method is difficult to prepare powder flakes with a smaller thickness; the third is that the thickness distribution of the aluminum powder produced by this process is uneven, and the powder surface is uneven, which causes the scattering and diffuse reflection of the powder surface and edge light, which seriously affects the brightness of the powder , color and metallic feeling; Fourth, the water surface covering power of the aluminum powder made by this process is low, generally no more than 1.4m 2 / g, the powder consumption per unit of printing and coating area is relatively large; fifth, the production process is complicated and the production cycle is long.