Aluminum powder pigment and its dry milling manufacturing method

Abstract

The invention provides an aluminum powder pigment, which is formed by mixing of the following components by weight: 96%-99% of aluminum powder; 0.75%-3% of stearic acid; 0.2-0.7% of a coupling agent; and 0.05%-0.3% of a dispersant. The dry milling manufacturing method of the aluminum powder pigment consists of the steps of: ball milling, grading screening, first stage finished product synthesis and second stage finished product synthesis. In the invention, a macromolecular coupling agent with a coordination group is adopted as a protective agent, the stearic acid plays a milling assisting role, and the milling means is changed overall. The method employs graded constant speed impact-free milling, three-level screening, and two-stage discharge to improve the diameter-thickness ratio and particle uniformity of the product. Nitrogen cooling and automatic temperature control protection are adopted as supplementary means to reduce the phenomenon of aluminum powder oxidation rate increase caused by temperature rise during preparation, and the likely surface oxidation problem in an aluminum powder processing process can be effectively solved, so that the sheet aluminum powder pigment with strong oxidation resistance, durable color and adjustable brightness. Also, according to demands and through corresponding blending, production of products with a variety of specification standard particle sizes can be realized.

Description

technical field [0001] The invention relates to the technical field of manufacturing solid metal powder pigments, in particular to a dry grinding manufacturing method of aluminum powder pigments. Background technique [0002] The aluminum powder particles used in pigments are scale-like. Due to the scale-like particle state, the aluminum powder has a metallic luster effect, an angle-dependent color effect, and a shielding effect. Moreover, aluminum powder has a low melting point and will explode when the concentration is reached. Therefore, it is necessary to pay special attention to safety guarantees such as explosion-proof and dust-proof during the production process. The current industrial production methods of metal aluminum powder are divided into dry method and wet method. Powder pigments are all produced by wet method. The wet production process is to add petroleum solvent to the ball mill, mix the fine aluminum powder with organic solvent, dispersant, etc. according ...

AI Technical Summary

Problems solved by technology

However, because most of them adopt wet screening process, it is difficult to disperse and classify the products. Moreover, the aluminum powder produced by this method has a wide particle size distribution, poor shape regularity, poor surface smoothness, and weak aluminum powder adhesion. Short storage period, poor flatness after being made into paint or ink, etc.