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Method for preparing modified micro granules

A particle and modification technology, applied in the field of preparation of modified micronized particles, can solve the problems of loss of micronized particles, difficulty in re-modification, small particles, etc., and achieve the effects of low cost, rich application performance and flexible application.

Inactive Publication Date: 2011-08-03
张颖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the active adsorption sites on the surface of the micronized particles prepared by this method have basically been occupied by the previous small-molecule dispersant and cannot be removed, this re-modification will become extremely difficult at this time. In other words, no matter how the micronized particles are treated, it is difficult to achieve the most ideal modification effect on the surface of the particles, which will inevitably be subject to many constraints in the next application.
For example, calcium carbonate prepared with sodium polyacrylate dispersant is difficult to be directly applied to polypropylene plastics. Even if it is re-modified by corresponding coupling agents, the interface fusion between it and polypropylene plastics will never reach the optimum level. Excellent results, resulting in an unavoidable considerable gap between it and in-situ polymerized nano-calcium carbonate in application performance
[0009] Secondly, in the traditional preparation process, the enrichment of the above micronized particles is also extremely difficult
Since the surface of the micronized particles is modified by a small molecule dispersant to be highly hydrophilic, and the small size of the particles makes it difficult to filter, it is difficult to separate the micronized particles from the reaction mother liquor, and there is a problem of micronized particle loss during the separation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A method for preparing modified micronized particles invented by this patent is characterized in that: adding a purifying agent to the mixed precipitate, converting the inorganic precipitate or its precursor part into water-soluble substances for removal, and carrying out the remaining precipitate Wash and concentrate.

[0027] A method for preparing modified micronized particles invented by this patent is characterized in that: adding a purifying agent to the mixed precipitate, converting all the inorganic precipitate or its precursors into water-soluble substances for removal, and carrying out the remaining precipitate Wash and concentrate.

[0028] A method for preparing modified micronized particles invented by this patent is characterized in that it further includes: mixing / reacting the purified mixed precipitate with a surface modifier to obtain modified micronized particles.

[0029] A preparation method of modified micronized particles invented by this patent...

Embodiment 1

[0080] At room temperature of 25°C, add 10 ml of 0.1 mol / L calcium chloride 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 Co., Ltd. Factory) adjust the speed to the maximum. Then add 5 ml of 0.1 mol / L sodium carbonate and 0.2 mol / L sodium hydroxide solution dropwise from above the center of the vortex formed by the magnetic rotor within 1 minute. After the dropwise addition is completed, stir for about 1 hour and then start static aging.

[0081]After ten hours, the suspension containing precipitates of calcium carbonate and calcium hydroxide was filtered. The resulting filter cake was placed in a 50 ml beaker. Start the magnetic stirrer, and slowly add 8 ml of 0.1 mol / L hydrochloric acid aqueous solution under vigorous stirring. After 30 minutes, filter again, then stir and wash with about 10 ml of water, then filter again, and wa...

Embodiment 2

[0085] Repeat the same experiment as in Example 1, with the calcium carbonate of gained: dispersed in 30 milliliters of liquid paraffin containing 0.1% oleic acid; dispersed in 30 milliliters of aqueous solution containing 0.1% oleic acid and 0.1% penetrant JFC; dispersed In 30 ml aqueous solution containing 0.1% anionic organic dye fluorescent yellow and 0.1% non-ionic surfactant penetrating agent JFC; dispersed in a pure acrylic emulsion called AT-150 with 3% acrylic group (Zhongshan An Deshi Chemical Co., Ltd.).

[0086] Calcium carbonate in the above liquid can be well dispersed, and the deagglomeration effect of calcium carbonate is basically the same as that of Example 1.

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PUM

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Abstract

The invention discloses a method for preparing modified micro granules. Co-precipitation reaction is performed in aqueous solution and between the freezing point and the boiling point of reaction mother solution to generate the micro granules or mixed sediment of micro granule precursor and inorganic sediment. The problems of contradiction between granule micronization and surface modification and difficult separation of the micro granules and the reaction mother solution in the conventional method for preparing the modified micro granules are solved, and the brand-new industrialized production method for modified micro, submicron or nano granules is provided.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of modified micronized particles. Background technique [0002] During the chemical reaction process of nucleation and growth, the water-insoluble micronized particles tend to have strong adhesion with each other, so that the micronized particles can only be used in the subsequent use with a particle size of several microns or even tens of microns. The size distribution in the filled substrate has extremely poor monodispersity (secondary particle size), and there is a significant gap in application performance compared with submicron or even nanoscale distribution of micronized particles. [0003] In order to obtain modified micronized particles with good secondary particle size, in the current industrial production, the preparation of such monodisperse micronized particles is generally achieved by adding small molecule dispersants under aqueous con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02C09C1/00C09C1/02C01F11/18C01F11/46C01B33/24C01B31/36C01G49/08C01F7/30C01G3/02C01G5/02C01B25/32B22F9/24C07C53/126C07C51/41C07D213/89
Inventor 刘刚张颖
Owner 张颖
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