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A kind of preparation method of highly dispersed barite

A barite, high-dispersion technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, calcium/strontium/barium compounds, etc., can solve the problem of reducing the mechanical properties of materials, poor dispersion, and ineffective effects and other problems, to achieve the effect of improving processing performance and stability, improving compatibility and improving dispersibility

Active Publication Date: 2021-11-16
平利县篮泰重晶石工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing preparation of ultrafine barite powder generally reaches the micron or even nanometer level. Due to the small particle size and high surface energy of the powder, it is easy to agglomerate and has poor dispersion, which reduces the mechanical properties of the material. Secondly, barite The compatibility of stone powder with organic matrix is ​​poor, which limits the application of ultrafine barite powder
[0004] At present, the main method to solve the problem of poor dispersion and easy agglomeration of ultrafine barite powder is to modify the surface of barite powder. The surface treatment agent used is usually fatty acid or its salt, although this method makes the powder dispersible It has been improved to some extent, but the effect is not obvious, and it is difficult to improve the compatibility of the powder and the organic substrate

Method used

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  • A kind of preparation method of highly dispersed barite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of highly dispersed barite, comprising the steps of:

[0029] (1) After barite is crushed to 20 mesh, then add HLM vertical mill and grind to 500 mesh to obtain barite powder;

[0030] (2) adding water and a dispersant to the barite powder to form a suspension with a mass concentration of 25%, continue to grind to a particle diameter of 150nm in a ball mill, filter, and dry to obtain nano barite; the dispersant is prepared by The mass ratio is composed of 2:1 polyethylene glycol distearate and octylphenol polyoxyethylene ether, and its addition is 1.8% of the barite powder weight;

[0031] (3) Add nano-barite to the reaction kettle, add water until the solid-to-liquid ratio is 1:2.5, heat to 50°C, and then add a mixed acid composed of citric acid, ethylenediaminetetraacetic acid and hydroxyethylenediphosphonic acid , stirred for 30min, filtered, and washed with water until the pH was 6.5; the added amount of the mixed acid was citric acid 80g / L, et...

Embodiment 2

[0035] A preparation method of highly dispersed barite, comprising the steps of:

[0036] (1) After the barite is crushed to 16 mesh, then add the HLMX ultra-fine vertical mill to grind to 600 mesh to obtain barite powder;

[0037] (2) adding water and a dispersant to the barite powder to form a suspension with a mass concentration of 30%, continue to grind in a ball mill to a particle diameter of 80nm, filter, and dry to obtain nano barite; the dispersant is prepared by The mass ratio is 1:1 polyethylene glycol distearate and octylphenol polyoxyethylene ether, and its addition is 2.2% of barite powder weight;

[0038] (3) Add nano-barite to the reaction kettle, add water until the solid-to-liquid ratio is 1:2, heat to 60°C, and then add a mixed acid composed of citric acid, ethylenediaminetetraacetic acid and hydroxyethylene diphosphonic acid , stirred for 25min, filtered, and washed with water until the pH was 7; the added amount of the mixed acid was citric acid 100g / L, et...

Embodiment 3

[0042] A preparation method of highly dispersed barite, comprising the steps of:

[0043] (1) After the barite is crushed to 10 mesh, then add the HLMX ultra-fine vertical mill to grind to 800 mesh to obtain barite powder;

[0044] (2) adding water and a dispersant to the barite powder to form a suspension with a mass concentration of 30%, continue to grind in a ball mill to a particle diameter of 120nm, filter, and dry to obtain nano barite; the dispersant is prepared by The mass ratio is composed of 3:1 polyethylene glycol distearate and octylphenol polyoxyethylene ether, and its addition is 1.5% of the barite powder weight;

[0045] (3) Add nano-barite to the reaction kettle, add water until the solid-to-liquid ratio is 1:3, heat to 55°C, and then add a mixed acid composed of citric acid, ethylenediaminetetraacetic acid and hydroxyethylenediphosphonic acid , stirred for 30 min, filtered, and washed with water until the pH was 6; the added amount of the mixed acid was 70 g / ...

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Abstract

The invention discloses a preparation method of highly dispersed barite. The barite is coarsely crushed, and then added to a pulverizer for grinding to obtain barite powder; water and a dispersant are added to the barite powder, and the barite is continuously ground in a ball mill until the particle size is 20-200nm, filter and dry to obtain nano-barite; add nano-barite to the reaction kettle, add water until the solid-liquid ratio is 1:2-3, then add mixed acid, stir, filter, and wash with water ; The mixed acid is composed of citric acid, ethylenediaminetetraacetic acid and hydroxyethylene diphosphonic acid; the nano-barite obtained after treatment is transported to the surface modification machine, adding alkyl naphthalene sulfonate and trimethyl The surface treatment agent composed of silyl clathrate polysilsesquioxane is stirred, dried and dispersed to obtain highly dispersed barite powder. The barite powder prepared by this method not only improves the dispersibility, but also improves the compatibility between the powder and the organic substrate, improves the processing performance, and the whiteness of the product can reach 95%, which broadens the barite powder. body application.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a preparation method of highly dispersed barite. Background technique [0002] Barite is an important barium-containing mineral with the characteristics of high density, stable chemical and thermal properties. The current barite minerals are mainly used in petrochemical and other low value-added fields, such as barite weighting agent, barium-containing chemical products, etc., while ultra-fine barite powder has fine particle size, large specific surface area, high chemical activity, high Whiteness is mainly used in industrial sectors such as coatings, papermaking, rubber, and medicine; in recent years, it has also been applied to high-tech military fields such as stealth materials and anti-radiation materials. [0003] The existing preparation of ultrafine barite powder generally reaches the micron or even nanometer level. Due to the small particle size and high surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46B82Y30/00
CPCB82Y30/00C01F11/462
Inventor 刘伍逵胡雪玲朱俊宇陈良元
Owner 平利县篮泰重晶石工贸有限公司
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