Method for preparing modified micro-barium sulfate

A barium sulfate and modification technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve problems such as difficult processing, and achieve the effects of simple processing procedures, low cost, and rich performance

Inactive Publication Date: 2010-08-04
张颖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of modified micronized barium sulfate, to solve the technical problem of difficult post-processing of modified micronized barium sulfate preparation method in the prior art

Method used

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Examples

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Effect test

preparation example Construction

[0022] A preparation method of modified micronized barium sulfate, comprising the following steps:

[0023] (1) The aqueous solution containing at least water-soluble barium salt and the aqueous solution containing at least water-soluble sulfate are subjected to co-precipitation reaction between 0-99 ° C to obtain a mixed precipitation of barium sulfate precipitation and other inorganic salt precipitation, the inorganic salt precipitation It can be converted into water-soluble substances by the action of purifying agent;

[0024] (2) Static aging of the mixed precipitate obtained in step (1);

[0025] (3) Mixing / reacting the aged mixed precipitate with a surface modifier to obtain modified micronized barium sulfate.

[0026] In the above method, between step (2) and step (3), it also includes: adding a purifying agent to the aged mixed precipitate, removing all the inorganic salt precipitate, and washing and concentrating the remaining precipitate.

[0027] In the above meth...

Embodiment 1

[0050] At room temperature of 25°C, add 10 ml of 0.1 mol / L barium sulfide aqueous solution into a 50 ml beaker, put a magnetic rotor coated with polytetrafluoroethylene, and place the SH05-3 constant temperature magnetic stirrer (Shanghai Minhang Hongpu Instrument Factory) ) to adjust the speed to the maximum. Then add 5 milliliters of 0.2 mol / L zinc sulfate aqueous solution dropwise from above the center of the vortex formed by the magnetic rotor within 1 minute (adjust the pH to 4-4.5 with sulfuric acid). After the dropwise addition is completed, stir for about 1 hour and then start static aging.

[0051] After ten hours, the suspension containing precipitates of barium sulfate and zinc sulfide was filtered through filter paper. Put the resulting filter cake into a closed flask with a negative pressure suction device. Add 10 ml of an aqueous solution containing 0.0021 mol of hydrochloric acid, start a magnetic stirrer, and stir vigorously. At the same time, the extracted ...

Embodiment 2

[0055] Under the experimental condition identical with embodiment one, be also the mixed aqueous solution of 0.1mol / L sodium sulfate and sodium carbonate (sodium sulfate and sodium carbonate equimolar ratio with the barium chloride solution of 10 milliliters of 0.1mol / L and 10 milliliters of total concentrations Mix) to react, the co-precipitation obtained in the present embodiment is barium carbonate precipitation, each step experimental condition of this embodiment and the step processing after co-precipitation reaction are all identical with embodiment one, do not repeat them here. The micronized barium sulfate obtained in this embodiment is analyzed with a laser particle size analyzer, and the volume average particle diameter d of the micronized barium sulfate secondary particle diameter can be seen 50 about 85 nm.

[0056] The preparation method of the modified micronized barium sulfate of the present invention generates a removable inorganic salt co-precipitation while g...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
Inventor 刘刚张颖
Owner 张颖
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