Method for preparing modified micro-barium sulfate

Abstract

The invention relates to a method for preparing modified micro-barium sulfate, which comprises the following steps of: firstly, carrying out coprecipitation reaction on an aqueous solution which at least contains water-soluble barium salt and an aqueous solution which at least contains water-soluble sulfate at 0-99 DEG C to obtain a mixed sediment of a barium sulfate sediment and other inorganic salt sediments, wherein the inorganic salt sediments can act with a purifying agent to be converted into a water-soluble substance; then standing and curing the mixed sediment; and mixing / reacting the cured mixing sediment with a surface modifying agent to obtain the modified micro-barium sulfate. After cured, the mixed sediment is subjected to purifying processing according to the concrete requirement. The invention effectively overcomes the defect of difficult post processing of the traditional method for preparing the modified micro-barium sulfate, can realize industrialized production of nano barium sulfate and also has the advantages of flexible application, performance abundance of barium sulfate, time saving, labor saving and low cost.

Description

technical field

[0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of modified micronized barium sulfate. Background technique

[0002] Precipitated barium sulfate is an important inorganic filler widely used in various products such as coatings, plastics, inks, rubber, fibers, and cosmetics. With the advancement of science and technology, the market's requirements for the miniaturization of precipitated barium sulfate particle size and surface modification technology are increasing day by day.

[0003] When water-soluble sulfate salt and water-soluble barium salt are mixed, insoluble barium sulfate precipitate can be obtained. Due to the strong adhesion between barium sulfate particles during the nucleation and growth process, barium sulfate can only be distributed in the filled matrix with a particle size of several microns or even tens of microns in subsequent use. Among the materials, it has extremely poor mo...