A high-efficiency extender calcium aluminum silicate pigment and its preparation method and application

Abstract

The present invention relates to the technical field of pigments, and specifically discloses a method for preparing a calcium aluminum silicate pigment, which is an efficient extender. The method comprises the following steps: adding calcium hydroxide and aluminum hydroxide to deionized water to prepare a suspension, adding silica sol to react under continuous stirring, aging after the reaction, and obtaining a calcium aluminum silicate gel; grinding the calcium aluminum silicate gel to obtain an ultrafine calcium aluminum silicate slurry; placing the ultrafine calcium aluminum silicate slurry in an ultrasonic reaction device, adjusting the pH to 4.5-8.5, adding a modifier to react under continuous stirring, and continuing the ultrasonic reaction; spray drying the slurry after the ultrasonic reaction to obtain the calcium aluminum silicate pigment. The method for preparing the calcium aluminum silicate pigment, which is an efficient extender, has no by-products in the reaction, and does not require impurity removal and pollution discharge; directly adopts ultrasonic chemical method for modification, avoids particle agglomeration, makes the modification more complete, saves time, and reduces energy consumption; the entire preparation process is simple, does not require heating and pressurization, has low energy consumption, and has low requirements for reaction equipment.