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Process for preparing high-dispersibility ultrafine mica powder

A technology of ultra-fine mica powder and high dispersibility, which is applied in the direction of inorganic pigment treatment, fibrous filler, chemical instruments and methods, etc., and can solve the problems affecting the whiteness and purity of ultra-fine mica powder, mixing of sand and dust, and loss of adhesion In order to achieve good hand feel and slipperiness, low equipment cost and energy consumption, and reduce dust

Active Publication Date: 2014-04-30
杭州弗沃德精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the jet mill has a strong instantaneous crushing force, which is easy to cause damage to the powder itself and lose its original adhesion.
However, it is easy to mix with sand and dust in the air when classified by cyclone separator, thus affecting the whiteness and purity of ultrafine mica powder.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 40 g of natural muscovite powder with an average particle size of 2 The composition is 16% silicon precursor ethanol mixture. Use a constant flow pump to pump SiO with a mica substrate coating rate of 9% by weight. 2 The corresponding calculated amount of silicon precursor ethanol mixture is added within 1 h, and then the reaction is continued for 1 h. The suspension of the mother liquor was filtered, washed 4 times with deionized water, and dried in an oven at 100° C. for 6 hours to obtain highly dispersible ultrafine mica powder.

Embodiment 2

[0019] Weigh 40 g of synthetic mica powder with an average particle size of 2 The composition is 16% silicon precursor ethanol mixture. Use a constant flow pump to pump SiO with a mica substrate coating rate of 9% by weight. 2 The corresponding calculated amount of silicon precursor ethanol mixture is added within 1 h, and then the reaction is continued for 1 h. The suspension of the mother liquor was filtered, washed 4 times with deionized water, and dried in an oven at 100° C. for 7 hours to obtain highly dispersible ultrafine mica powder.

Embodiment 3

[0021] Weigh 200 g of natural muscovite powder with an average particle size of 2 The composition is 16% silicon precursor ethanol mixture. Use a constant flow pump to pump SiO with a mica substrate coating rate of 2% by weight. 2 The corresponding calculated amount of silicon precursor ethanol mixture is added within 1 h, and then the reaction is continued for 1 h. The suspension of the mother liquor was filtered, washed 4 times with deionized water, and dried in an oven at 100° C. for 8 hours to obtain highly dispersible ultrafine mica powder.

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Abstract

The invention relates to a process for preparing high-dispersibility ultrafine mica powder, comprising the following steps: preparing a silicon precursor ethanol mixed solution from anhydrous ethanol and one or more of the tetramethoxysilane, the tetraethoxysilane with the mass parts of silica of 28, the ethyl silicate with the mass parts of silica of 32 and the ethyl silicate with the mass parts of silica of 40; adding natural muscovite or synthetic mica into a reactor, adding deionized water to prepare a suspension; stirring and heating the suspension, and adjusting the pH value of the suspension by aqueous alkali; pumping the silicon precursor ethanol mixed solution into the suspension, and continuously subjecting the silicon precursor ethanol mixed solution and the suspension for reaction of 1 hour to obtain a mother solution; removing suspended matters in the mother solution by filtering, washing by deionized water, and washing a filtrated in a baking oven to obtain the high-dispersibility ultrafine mica powder. The process can fully exert the advantages of the ultrafine mica powder, is simple and has the advantages of high production efficiency, low equipment cost and low energy consumption.

Description

technical field [0001] The utility model relates to a preparation process of highly dispersed ultrafine mica powder, which belongs to the preparation of chemical surface coating modified inorganic powder. Background technique [0002] Mica pearlescent pigment is currently the most produced and widely used pearlescent pigment in the world. It is mainly based on natural mica and synthetic mica. With the rapid development and wide application of mica pearlescent pigments, the demand for substrates is also increasing. At present, the industry generally adopts the process of wet grinding and gravity sedimentation to produce pigment-grade mica flakes. In this process, in addition to the 10-200μm mica powder that can be used in pearlescent pigments, there are quite a few ultrafine mica powders that are less than 15μm or even less than 5μm. Because it is a flake material, the agglomeration phenomenon is serious during the drying process, which is not conducive to the dispersion o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/06C09C1/40
Inventor 周亚军
Owner 杭州弗沃德精细化工有限公司
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