Method for stripping laminated inorganic material

A technology of inorganic materials and layers of inorganic materials, applied in inorganic chemistry, chemical instruments and methods, silicon compounds, etc., can solve the problems of long time required, weakened bonding force, reduced particle size, etc., to achieve faster reaction rate, heating Fast, uniform heating effect

Inactive Publication Date: 2010-06-16
BEIJING UNIV OF CHEM TECH
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AI-Extracted Technical Summary

Problems solved by technology

[0003] The peeling technology of layered inorganic materials includes mechanical grinding peeling method and chemical peeling method. The disadvantage of mechanical grinding method alone is: excessive grinding will destroy the crystal structure of inorganic materials, resulting in poor product performance; the principle of chemical peeling is to use intercalation The interlayer effect makes the layered inorganic materials expand between layers, and the bonding force is greatly weakened. After removing the intercalation object, the original stacked sheet-like layered inorganic materials are naturally decomposed into small flake-like inorganic materials to achieve the purpose of natural exfoliation
Among them, Tsunematasu et al. used the grinding method to exfoliate the kaolin-urea intercalation complex, but the formed particles were in the micr...
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Abstract

The invention relates to a method for stripping a laminated inorganic material, which comprises the following steps of: firstly preparing a laminated inorganic material organic intercalation compound, then decomposing the organic substance at the interlayer of the solid of the laminated inorganic material organic intercalation compound or the laminated inorganic material organic intercalation compound added into a proper solution within short time under the condition of ultrasonic waves or microwaves, escaping from the interlayer of the laminated inorganic material so as to rapidly strip the laminated inorganic material, and finally separating, washing, drying and grinding to obtain a product. By using the method, not only the laminated inorganic material can be stripped within short time, but also the good crystal structure of the laminated inorganic material can be kept, so that the traditional application of the laminated inorganic material is qualitatively improved, and the value is doubled and redoubled.

Application Domain

Technology Topic

MicrowaveInorganic materials +2

Image

  • Method for stripping laminated inorganic material

Examples

  • Experimental program(2)

Example Embodiment

[0021] Example 1
[0022] Step 1: Preparation of kaolin-urea intercalation composite
[0023] Weigh 5g of kaolin and place it in a flask, then add 50ml of saturated urea solution (with a concentration of about 13M), stir for 3 days in a water bath at 65°C, centrifuge, and then wash the residual urea on the surface of the kaolin with absolute ethanol. After centrifugal separation and drying under vacuum at 60°C, the urea-kaolin intercalation composite is obtained, and the intercalation rate is 65%.
[0024] Step 2: Ultrasonic acid leaching decomposition method to quickly strip the kaolin
[0025] Add 1 g of the above-prepared kaolin-urea intercalation composite to the acid solution, and immediately perform ultrasonic treatment for 5 minutes after mixing, so that the kaolin is naturally peeled off.
[0026] Step 3: Finished product
[0027] The kaolin obtained above is repeatedly washed with absolute ethanol 2 to 3 times, and then dried at 60° C. to obtain a peeled product of kaolin. It is measured that the thickness of the crystal grain is reduced from the original 40nm to 13nm, and the particle size at the maximum volume percentage of the particle size distribution is also reduced from 6.32μm of the original soil to 4.17μm.

Example Embodiment

[0028] Example 2
[0029] Step 1: Preparation of hydrotalcite-OBSH intercalation composite
[0030] (1) Disperse 2 g of hydrotalcite evenly in 20 ml of deionized water, and add hydrochloric acid dropwise to adjust the liquid pH=4.
[0031] (2) Dissolve 2g OBSH solid in 40ml DMSO to form a clear solution.
[0032] (3) Mix the two solutions configured in steps 1 and 2 with each other in a constant temperature water bath at 40°C, stirring for 24 hours, centrifugal separation, and drying the resulting precipitate for 24 hours to obtain the final white product, which is the hydrotalcite-OBSH intercalation complex .
[0033] Step 2: Quickly peel off the hydrotalcite
[0034] Put 1g of the above-prepared hydrotalcite-OBSH intercalation composite into a microwave oven and heat it to rapidly decompose the OBSH, so that the hydrotalcite can be peeled off naturally.
[0035] Step 3: Finished product
[0036] The hydrotalcite obtained above is repeatedly washed with absolute ethanol 2 to 3 times, and then dried at 60° C. to obtain a stripped product of the hydrotalcite. It is measured that the thickness of the crystal grain is reduced from the original 30-40nm to 5-10nm.
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Description & Claims & Application Information

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