Coated iron oxide black pigment and preparation method thereof

Abstract

The invention discloses a coated iron oxide black pigment and a preparation method thereof, and belongs to the technical field of iron oxide black pigment preparation. The method comprises the following steps: (1) adding an iron oxide black filter cake and water into a reaction container, and uniformly stirring; (2) preparing an additive into an aqueous solution, adding the aqueous solution into areaction container, and mechanically ball-milling and dispersing to obtain an iron oxide black dispersion liquid; (3) heating the iron oxide black dispersion liquid, adding a soluble aluminum salt under a nitrogen atmosphere condition, heating, and controlling the temperature for coating; and (4) carrying out centrifugal separation, drying the filter material, and calcining to obtain the iron oxide black pigment coated with the aluminum layer. Air is isolated in the coating process, and black iron oxide is prevented from being oxidized in the coating process; the dispersion performance of theiron oxide black is improved by adopting the additive and a mechanical ball milling mode, and more stable dispersion liquid is obtained. The pigment is uniform in particle size, and the outer layer is coated with a layer of compact aluminum film, so that the pigment cannot be oxidized even at high temperature, and the performance of the pigment is more stable.

Description

technical field [0001] The invention belongs to the technical field of iron oxide black pigment preparation, and in particular relates to a coated iron oxide black pigment and a preparation method thereof. Background technique [0002] Iron-based pigments are important inorganic color pigments, and their annual output ranks first in inorganic color pigments. Iron oxide pigment is a kind of pigment with good dispersibility, excellent light resistance and weather resistance, and has simple chemical composition, non-toxic and pollution-free, and is widely used in paints and coatings in the construction industry. Iron oxide pigments mainly refer to colored pigments such as iron oxide black, iron yellow and iron brown based on iron oxide. [0003] Iron oxide black is referred to as iron black molecule, Fe 2 o 3 ·FeO, the chemical name is ferric oxide, belongs to spinel type, it has saturated blue ink light black, relative density is 4.73; its hiding power and coloring power ar...

AI Technical Summary

Problems solved by technology

Iron oxide black will be dehydrated and oxidized to iron red when the temperature reaches about 100°C. If iron oxide black is used in some high temperature occasions, fading and discoloration will occur, which limits the scope of use of iron oxide black.