Preparation method of medium-temperature-resistant magnetic pearlescent pigments

Abstract

The invention belongs to the technical field of pigments, and relates to a preparation method of medium-temperature-resistant magnetic pearlescent pigments. The preparation method comprises the following steps: step I, adding a finished product pearlescent pigments into deionized water under a stirring condition, heating, stirring, and obtaining pearlescent pigment suspension; step II: adding ferrite into an iron salt solution, stirring, completely stirring, adding a complexing agent, stirring, dissolving, and obtaining an iron mixed solution; step III: mixing the pearlescent pigment suspension obtained in step I and the iron mixed solution obtained in step II, dropwise adding urea, and obtaining slurry; and step IV: heating the slurry obtained in step III to 85 to 95 DEG C, dropwise adding a tetraethoxysilane solution diluted by a diluting agent under a constant-temperature stirring condition, then continuously stirring for 2 to 4 hours, performing the suction filtration, cleaning, drying, and obtaining the medium-temperature-resistant magnetic pearlescent pigments. By introducing the complexing agent, the problem of the weakening of pigment magnetism caused by the oxidation of ferrite ions by the air in the reaction process can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of pigments, and relates to a preparation method of a medium-temperature-resistant magnetic pearlescent pigment. Background technique [0002] In recent years, with the continuous deepening of my country's economic reform, people's living standards have been significantly improved, and they have a deeper understanding and higher requirements for the quality of life. With the innovation of decoration, 3D three-dimensional magic pearlescent as a high-end pearlescent pigment It has become the new favorite of fashion decoration. Its unique 3D stereoscopic effect, dreamy and vivid colors, unique metal texture, natural and smooth lines, and changeable visual effects are very popular among designers and popular choices for decoration. It endows natural and beautiful three-dimensional lines and patterns, and deep visual effects to make the product feel alive. Widely used in 3D three-dimensional phantom glass product...

AI Technical Summary

Problems solved by technology

Chinese patent CN104893366B proposes to deposit iron cobaltate, aluminum oxide, and silicon oxide on the surface of the pearlescent pigment substrate in sequence, and then undergo suction filtration, washing, drying and high-temperature calcination to prepare a magnetic pearlescent pigment with 3D effect; this preparation process High-temperature calcination is required to form magnetic cobalt ferrite, but the high-temperature calcination step will easily reduce the color purity of the pearlescent substrate and increase energy consumption. At the same time, the product contains heavy metal cobalt, which limits its application in the field of cosmetics.

This preparation process needs to be carried out under anaerobic conditions, which has high requirements on equipment and operation, and high production costs, which affect its large-scale production; the prepared black glossy magnetic pearl is not resistant to medium temperature and is easy to oxidize, resulting in a decrease in color purity and magnetic properties.