Zinc powder pigment and manufacturing method by dry milling

Abstract

The invention provides a zinc powder pigment which is prepared by mixing the following components in parts by weight: 97-98.5% of zinc powder, 1-2% of stearic acid, 0.4-0.7% of coupling agent and 0.1-0.3% of dispersing agent. The manufacturing method of the zinc powder pigment by dry milling comprises the following steps: ball milling, graded screening, synthesis of primary finished product, and synthesis of secondary finished product. The high-polymer coupling agent with coordination group is used as a protective agent, and the stearic acid has the effect of assisting milling, thereby integrally changing the milling mode; the graded uniform-speed impact-free grinding, three-stage screening and two-stage discharging are utilized to enhance the radius-thickness ratio and particle uniformity of the product; and nitrogen cooling and automatic temperature control protection are used as auxiliary means to reduce the phenomenon of increased zinc powder oxidation rate due to temperature rise in the preparation process and effectively solve the problem of high oxidation tendency of the zinc powder surface in the working process, thereby obtaining the flake zinc powder pigment with strong oxidation resistance and enduring, bright and adjustable color.

Description

technical field [0001] The invention relates to the technical field of manufacturing solid metal powder pigments, in particular to a zinc powder pigment and a dry grinding manufacturing method thereof. Background technique [0002] Zinc powder is an indispensable main raw material in anti-corrosion coatings. It is mixed with other reagents to make a mixed liquid and sprayed on the surface of the article, which can play various functions such as corrosion resistance, beauty, and heat resistance. The potential is more negative, and it turns into a solution in the dielectric, thereby protecting the basic iron from corrosion, which is the "sacrificial anode method". This is even more so if the coating is damaged and the base metal is exposed. In addition, because the corrosion reactants of the zinc powder are deposited between the zinc powder particles, filling the gaps between the pigments and not conducting electricity, the coating has a sealing effect. , and the zinc powder ...

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Problems solved by technology

This is even more so if the coating is damaged and the base metal is exposed. In addition, because the corrosion reactants of the zinc powder are deposited between the zinc powder particles, filling the gaps between the pigments and not conducting electricity, the coating has a sealing effect. , and the zinc powder provided by the zinc powder manufacturer contains different particle sizes, ranging from +8 to -160 mesh. This mixed zinc powder is further sieved, so that it is not conducive to the user to selectively select according to the use Addition, if it cannot meet the different requirements of the particle size of zinc powder for copper removal, cobalt nickel removal and cadmium removal in the arsenic salt purification process, in addition, the shielding effect, because the scaly zinc powder is arranged in the coating parallel to the surface of the coating film, and mutually Overlapping and staggering greatly increase the distance that water and corrosive media penetrate through the coating, thereby improving the anti-corrosion ability of the coating. At present, there are many ways to improve and refine zinc powder. Generally, concentrated sulfuric acid, concentrated nitric acid, etc. Acidification treatment with a strong oxidant, followed by washing, filtering, drying, etc., to obtain fine zinc powder, but these methods generally cause great damage to the natural zinc powder, and it is easy to change the internal structure of the zinc powder, thereby changing the zinc powder itself. Some physical properties, and its shape cannot be flaked, thus failing to achieve the ideal use effect, so it is necessary to study a high-efficiency zinc powder screening method and device to provide zinc powder with different particle sizes to meet different purposes requirements