Preparation method of aluminum silicate-white carbon black composite filler

Abstract

The invention discloses a preparation method of an aluminum silicate-white carbon black composite filler. The preparation method comprises the following steps: adding water and a silicon compound intoa reaction kettle, stirring, heating to 60-90 DEG C, and adding the silicon compound and an acidifying agent to react until the pH value of the reaction solution is 8.0-11.0; after curing, adding analuminum compound solution to continuously react, adding a precipitator to generate sodium aluminosilicate gel, and then continuously curing to obtain a sodium aluminosilicate nanoparticle suspension;adding a silicon compound into the suspension; stirring to make pH equal to 8-11, heating to 60-90 DEG C to obtain a silica reaction substrate, adding a silicon compound and an acidifying agent for 1-2 hours at the same time, wherein the pH value is maintained to be 8-11, stopping adding the silicon compound after slurry of the nano sodium aluminosilicate-white carbon black composite filler is obtained, continuously adding the acidifying agent until the pH value is 3.0-6.0, and stopping adding so as to obtain a suspension of the nano sodium aluminosilicate-white carbon black composite filler;and filtering, washing and high-temperature quick-drying the suspension to obtain the nano sodium aluminosilicate core and silicon dioxide coated shell composite filler with high extinction efficiency, good dispersity and storage stability.

Description

technical field [0001] The invention relates to a method for preparing a powder inorganic material, in particular to a method for preparing a nano-aluminum silicate-white carbon black composite filler. Background technique [0002] Aluminum silicate, also known as sodium aluminosilicate, is a functional silicate product with a small primary particle size (1um ~ 10um), very fine particles and excellent suspension. It is a kind of silicic acid, A composite powder material generated in situ from the sodium salt of aluminate. Sodium aluminosilicate is a white powder with a special appearance. Compared with expensive titanium dioxide, it has similar performance in many application fields. Adding sodium aluminosilicate to latex paint can not only save 15-25% titanium dioxide, and a lot of cost savings; and because of its developed pore structure, strong moisture absorption and ultra-high whiteness, it has been used in pesticides instead of silicon dioxide in recent years, and the...

AI Technical Summary

Problems solved by technology

During the reaction process, the concentration of the base base gradually changes from high to low, and the pH of the reaction system changes accordingly. The size of the primary silica particles produced is uneven, and the agglomeration of silica particles is serious, resulting in small pore volume and poor pore size distribution. Wider, low extinction efficiency and poor dispersion, etc.