Dry method for preparing intercalation compound of monotomorillonite/urea

A technology of intercalation composite and montmorillonite, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems such as redundant step aggregation, and achieve large surface layer spacing, simple process and low cost. Effect

Inactive Publication Date: 2005-01-12
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Throughout the present, the preparation method of montmorillonite / urea intercalation compound, "montmorillonite is used as fertilizer slow-release agent and carrier" (notification number: 1298853); "ammonium bicarbonate fertilizer with bentonite as filler" (notification number : 1185424); "A kind of sustained-release urea and preparation method thereof" (Notice No.: 1408351), these methods all adopt wet method or encapsulation method, and their drawback is: adopt wet method, final procedure also needs heating and drying, The urea can only be inserted between the montmorillonite layers, so the wet method is a redundant step; with the encapsulation method, urea can only be adsorbed on the surface of the montmorillonite, and cannot enter the interlayer of the montmorillonite crystal structure

Method used

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  • Dry method for preparing intercalation compound of monotomorillonite/urea
  • Dry method for preparing intercalation compound of monotomorillonite/urea
  • Dry method for preparing intercalation compound of monotomorillonite/urea

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Effect test

Embodiment 1

[0023] 30Kg, less than 45 μm (less than 325 orders), Henan Xinyang sodium-based montmorillonite powder ( figure 1 ) and 3Kg of urea powder were mixed uniformly, put into an oven, and kept at a constant temperature between 90 and 120°C for 3 hours to obtain a montmorillonite / urea intercalation compound ( figure 2 ), by X-ray diffraction (XRD) line figure 1 and figure 2 It can be seen that the original (001) interlayer spacing of Na-montmorillonite is 1.27nm, and after intercalation of urea molecules, it expands to 2.17nm.

[0024] The temperature of the oven or mixer should not be higher than 132°C, otherwise the urea molecules entering the interlayer of montmorillonite will be decomposed. The content of urea cannot exceed 30% of the weight of the montmorillonite, and excess urea cannot enter between layers of the montmorillonite crystal structure, and can only be adsorbed on the surface of the montmorillonite.

Embodiment 2

[0026] Mix 50Kg of Henan Xinyang Na-based montmorillonite powder with a thickness of less than 45μm and a montmorillonite content of about 90% and 10Kg of urea powder evenly, put them in an oven, and keep the temperature between 90 and 120°C for 3 hours to obtain urea / Montmorillonite intercalation complex ( image 3 ), the interlayer spacing of the montmorillonite (001) surface expanded from 1.27nm to 2.03nm.

Embodiment 3

[0028] Mix 2Kg of Henan Xinyang Na-based montmorillonite powder with a thickness of less than 45μm and a montmorillonite content of about 90% and 0.2Kg of urea powder, put them in an oven, and keep the temperature at 90-120°C for 1 hour to obtain urea / montmorillonite intercalation complex( Figure 4 ), the interlayer spacing of the (001) surface of montmorillonite expanded from 1.27nm to 1.83nm.

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Abstract

A method for preparing intercalation composite of imvite/urea is featured as mixing sodium-base or calcium-base imvite powder material in diamemter of less than 45 micron m with urea powder uniformly, holding the mixture for 1-3 hr. at constant temperature to have urea molecule entered into interlayer of imvite crystal structure and obtaining the intercalation composite by expanding interlayer distance from 1.27nm-1.55 nm to 1.68 nm to 2.17 nm on imvite face.

Description

technical field [0001] The invention relates to a method for preparing a montmorillonite / urea intercalation compound, in particular to a dry intercalation method. Background technique [0002] Bentonite is also called bentonite or bentonite. It was first discovered in the paleostratum of Wyoming in the United States. It is a yellow-green clay that swells into a paste after adding water. People collectively call this type of clay bentonite. The main mineral component of bentonite is montmorillonite, with a content of 85% to 90%, and a small amount of feldspar, quartz, beidellite, calcite and volcanic glass. It can be white, and when it contains impurities, it can be light green, off-white, pink and other colors. It can be dense block or loose soil. It feels slippery when you rub it with your fingers. After adding water, the volume of the small block expands several times to dozens of times. It is suspended in water and becomes paste when there is little water. my country's...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/06
Inventor 严春杰陈洁渝
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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