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Aluminum powder is widely used as a kind of metal pigment because of its wide application, high demand and variety. The aluminum particles used in the pigment are scale like, and it is precisely because of the size of the particles, aluminum powder has a metal color and shielding function. The metal powder industrial production long ago, early production is pounding washing method, the groove on the aluminum debris impact machine ramming, pestles continuous punching in mechanical drive hit aluminum scrap groove, malleable aluminum sheet and the impact gradually become broken, become very meager in aluminum after fine screening out of aluminum products as required. The production efficiency is very low, the product quality is not easy to grasp, and the production process of dust, very easy to fire and explosion. In 1894, the German Hamtag used for mill powder in ball mill into steel ball, aluminum scraps and lubricant, after the ball break aluminum scraps flying by a flake of aluminum powder, filled with inert gases in ball mill and the pipe, this method is still in use, called "dry production". In 1910, the United States J.Hall invented in the ball mill to join the petroleum solvent instead of inert gas, the production of aluminum powder and solvent mixed slurry, become slurry aluminum pigment. The method has the advantages of simple equipment, safe process and convenient use. The vast majority of modern aluminum powder pigments are used in this way". |
