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Method for preparing surface-modified hydrotalcite compound through adopting brucite

A hydrotalcite-type, surface modification technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems such as hindering the large-scale application of hydrotalcite, high preparation cost of hydrotalcite, increasing the cost of hydrotalcite, etc. The effect of saving production time and simplifying the production process

Inactive Publication Date: 2013-09-25
ZHAOQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of these methods is relatively complicated, the production time is long, and it is easy to cause environmental pollution, and it also further increases the cost of hydrotalcite
Therefore, the production cost brought by the two steps of hydrotalcite synthesis and later surface modification makes the current preparation cost of hydrotalcite generally high, hindering the large-scale application of hydrotalcite

Method used

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  • Method for preparing surface-modified hydrotalcite compound through adopting brucite
  • Method for preparing surface-modified hydrotalcite compound through adopting brucite
  • Method for preparing surface-modified hydrotalcite compound through adopting brucite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 2.48g of brucite, 3.28g of sodium metaaluminate, 4.42g of sodium carbonate, 0.07g of Span-80 and a certain amount of water in a hydrothermal reaction kettle, keep the temperature at 120°C for 16h under full stirring, and after cooling Suction filtration, washing, and drying at 90°C for 12 hours to obtain surface-modified magnesium aluminum hydrotalcite. After testing, the degree of activation is 1.

[0026] Contrast group: Weigh 2.48g brucite, 3.28g sodium metaaluminate, 4.42g sodium carbonate and a certain amount of water in a hydrothermal reaction kettle, under full stirring, keep the temperature at 120°C for 16h, suction filter and wash after cooling , and dried at 90°C for 12 hours to obtain surface-modified magnesium aluminum hydrotalcite. After testing, the activation degree was 0.

[0027] The degree of activation is one of the indicators for measuring the hydrophobicity of the surface of inorganic substances after modification, and is used to judge the d...

Embodiment 2

[0030] Weigh 5.54g of brucite, 5.63g of aluminum nitrate, 0.84g of sodium bicarbonate, 4ml of ammonia water, 0.07g of monopropylene glycol stearate, and a certain amount of water in a hydrothermal reaction kettle. After cooling for 1 hour, filter with suction, wash, and dry at 90°C for 12 hours to obtain surface-modified magnesium aluminum hydrotalcite. After testing, the degree of activation is 0.9.

Embodiment 3

[0032] Weigh 3.69g brucite, 1.02g alumina, 0.99g zinc hydroxide, 0.90g urea, 1.12g potassium hydroxide, 0.30g titanate coupling agent KR-201 and a certain amount of water in the hydrothermal reaction kettle , under full stirring, at a constant temperature of 180°C for 4 hours, after cooling, suction filtration, washing, and drying at 90°C for 12 hours, to obtain surface-modified magnesium-aluminum-zinc hydrotalcite. After testing, the degree of activation is 1.

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Abstract

The invention relates to the technical fields of hydrotalcite compound preparation and surface modification, and concretely relates to a method for preparing a surface-modified hydrotalcite compound through adopting brucite. The method comprises the following processing processes: adding brucite, an aluminum source, an alkali source, a surface modifier and water according to a certain ratio, fully stirring, reacting in a hydrothermal reaction vessel at 100-250DEG C for 1-20h, washing, filtering, and drying to obtain the surface-modified hydrotalcite compound. The method which adopts cheap and easily available brucite as a raw material and allows the hydrotalcite synthesis and surface modification to be simultaneously carried out simplifies the production technology, saves the production time, substantially reduces the production cost, and provides possibility for the large-scale industrial production of the surface-modified hydrotalcite compound.

Description

technical field [0001] The invention relates to the technical field of preparation and surface modification of hydrotalcite compounds, in particular to a method for preparing surface-modified hydrotalcite compounds by using brucite as a raw material. Background technique [0002] Hydrotalcite-like compounds (LDHs) are a class of anionic layered compounds with broad application prospects, mainly including hydrotalcite (HT), hydrotalcite-like (HTLC for short) and their intercalation chemical product pillared hydrotalcite (Pillared LDH ). Its chemical composition can be expressed as [MII 1-x MⅢ x (OH) 2 ] x + (A n- ) x / n mH 2 O, where MII is Mg 2+ 、Ni 2+ 、Co 2+ , Zn 2+ 、Cu 2+ and other divalent metal cations; MⅢ is Al 3+ 、Cr 3+ , Fe 3+ 、Sc 3+ and other trivalent metal cations; A n - is an anion, such as CO 3 2- , NO 3 - , Cl - , OH - , SO 4 2- 、PO 4 3- 、C 6 h 4 (COO) 2 2- Inorganic and organic ions and complex ions. Typical hydrotalcite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 郝向英沈冠华冯海强罗业燊王敏
Owner ZHAOQING UNIV
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