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Barium sulfate material and preparation method thereof

A barium sulfate, sodium sulfate aqueous solution technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, nanotechnology for materials and surface science, etc. Poor effect, poor hydrophobicity and dispersibility of barium sulfate, etc., to achieve excellent hydrophobicity and particle size controllability, ensure hydrophobicity, and meet mixing requirements.

Active Publication Date: 2019-01-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coating effect of traditional modification methods is poor, especially for barium sulfate precipitation with small particle size
At the same time, the reaction speed of the precipitation reaction is fast, and the mixing intensity of the traditional stirred tank reactor is difficult to meet the needs of the rapid precipitation reaction, resulting in poor hydrophobicity and dispersibility of the final prepared barium sulfate

Method used

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  • Barium sulfate material and preparation method thereof
  • Barium sulfate material and preparation method thereof

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preparation example Construction

[0023] The invention provides a kind of preparation method of barium sulfate material, comprises the following steps:

[0024] (1) In the film dispersion microreactor, the continuous phase and the dispersed phase are mixed to obtain a mixed solution; the continuous phase is an aqueous barium chloride solution, and the dispersed phase is a mixture of an aqueous sodium sulfate solution and an ethanol solution containing a surfactant mixture;

[0025] (2) carrying out the precipitation reaction to the mixed solution obtained in the step (1) to obtain a barium sulfate suspension;

[0026] (3) The barium sulfate suspension obtained in the step (2) is subjected to an aging reaction to obtain a barium sulfate material.

[0027] In the present invention, the continuous phase and the dispersed phase are preferably prepared first.

[0028] In the present invention, the continuous phase is an aqueous solution of barium chloride. In the present invention, the concentration of the bariu...

Embodiment 1

[0044] (1) In the membrane dispersion microreactor, pass the dispersed phase through the microporous membrane at a flow rate of 20mL / min, and quickly mix with the continuous phase flowing at a flow rate of 20mL / min to obtain a mixed solution; the continuous phase is the concentration Be the barium chloride aqueous solution of 0.2mol / L, the dispersed phase is the mixed solution that concentration is the sodium sulfate aqueous solution of 0.4mol / L, the ethanol solution of the sodium stearate of 0.5mmol / L according to volume ratio 1:1 mixing; The microporous equivalent diameter of the microporous membrane in the membrane dispersion reactor is 5 μm;

[0045] (2) passing the mixed solution through a coil pipe with an outer diameter of 3 cm and a length of 1.5 meters and carrying out a precipitation reaction, the temperature of the precipitation reaction is 50° C., and the precipitation reaction product flows into a stirred tank to continue stirring to obtain a barium sulfate suspens...

Embodiment 2

[0049] (1) In the membrane dispersion microreactor, pass the dispersed phase through the microporous membrane at a flow rate of 20mL / min, and quickly mix with the continuous phase flowing at a flow rate of 20mL / min to obtain a mixed solution; the continuous phase is the concentration It is a 0.1mol / L barium chloride aqueous solution, and the dispersed phase is a mixed solution in which a concentration of 0.2mol / L sodium sulfate aqueous solution and 1mmol / L sodium stearate ethanol solution are mixed according to a volume ratio of 1:1; the film The microporous equivalent diameter of the microporous membrane in the dispersion reactor is 2 μm;

[0050] (2) passing the mixed solution through a coil pipe with an outer diameter of 3 cm and a length of 1.5 meters and carrying out a precipitation reaction, the temperature of the precipitation reaction is 50° C.; the precipitation reaction product flows into the stirred tank and continues to stir to obtain a barium sulfate suspension;

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Abstract

The invention provides a barium sulfate material and a preparation method thereof, and belongs to the technical field of inorganic material preparation. The method comprises the following steps: mixing a continuous phase and a dispersed phase in a membrane dispersion micro-reactor to obtain a mixed solution; carrying out a precipitation reaction on the mixed solution to obtain a barium sulfate suspension; and carrying out an aging reaction on the suspension to obtain the barium sulfate material, wherein the continuous phase is a barium chloride water solution, and the dispersed phase is a mixed solution of a sodium sulfate water solution and a surfactant-containing ethanol solution. According to the invention, rapid mixing of barium chloride, sodium sulfate and a surface modifier solutioncan be realized in the membrane dispersion micro-reactor, mass transfer efficiency of the system is effectively improved, and mixing requirements of a precipitation process are met. Meanwhile, uniformnesting of the surfactant on the surface of the barium sulfate is realized in situ, and realization of surface hydrophobic modification and particle size controllability of the barium sulfate material is facilitated. According to the embodiment, the contact angle of the barium sulfate material provided by the invention is 80-110 degrees, and the particle size is in a range of 30-80 nm.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic materials, in particular to a barium sulfate material and a preparation method thereof. Background technique [0002] Barium sulfate material is widely used as filling material for coatings, plastics, rubber, resins, etc. due to its high whiteness, high specific gravity and strong acid and alkali resistance. However, the strong polarity and weak polymer affinity of the barium sulfate surface lead to poor dispersion of barium sulfate materials in the filling system, which will directly affect the performance of the product. Therefore, for the industrial application of barium sulfate, its surface modification is indispensable. [0003] The traditional modification method uses the modifier to add barium sulfate precipitation and high-speed stirring, so as to realize the coating of the modifier on the barium sulfate surface. However, the traditional modification method has poor coat...

Claims

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Application Information

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IPC IPC(8): C01F11/46B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01F11/462C01P2004/01C01P2004/04C01P2004/64
Inventor 王玉军王景绰骆广生闫振宗于之贺
Owner TSINGHUA UNIV
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