Method for preparing high thermal-stability clay mineral-iron oxide red hybrid pigment by co-precipitation technology

Abstract

The invention discloses a method for preparing high thermal-stability clay mineral-iron oxide red hybrid pigment by a co-precipitation technology. The method comprises the following steps: dispersingnatural clay mineral in an iron salt aqueous solution; fully stirring and performing ultrasonic treatment; adding a precipitant; regulating the pH to 6-10; reacting for 0.5-4h at room temperature to obtain a clay mineral-ferric hydroxide hybrid precursor; centrifuging the precursor, washing, drying and calcining to obtain a series of clay mineral-iron oxide red hybrid pigment. According to the method disclosed by the invention, by adding the clay mineral, the preparation cost of the iron oxide red pigment is effectively reduced, and the agglomeration and size increase of alpha-Fe2O3 nano particles in the follow-up calcination and crystallization process are avoided; the prepared clay mineral-iron oxide red hybrid pigment has bright color and show excellent high-temperature resistance and is far more superior to the general commercial iron oxide red pigment and can meet the needs of high-end fields. Moreover, with a co-precipitation process, the method disclosed by the invention is simple in technology and facilitates large-scale production.

Description

technical field

[0001] The invention relates to a preparation method of a clay mineral-iron red hybrid pigment, in particular to a method for preparing a highly thermally stable clay mineral-iron red hybrid pigment by co-precipitation technology, which belongs to the deep processing of natural non-metallic minerals and nanocomposite materials Preparation technology field. Background technique

[0002] Pigment is an important element that makes up the colorful world, and it has played a very important role throughout the ages. Pigments can be divided into organic pigments and inorganic pigments. Relatively speaking, inorganic pigments have superior light resistance and high temperature resistance, and are irreplaceable in many fields (Nature 404 (6781) (2000) 980-982). Among many inorganic pigments, red pigments are widely used because of their high visibility. Common red pigments include iron red ( α -Fe 2 o 3 ), cadmium red (CdS•CdSe), mercury red (HgS), lead red (Pb ...

Images