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Magnesium aluminum hydrotalcite and method for preparing magnesium aluminum hydrotalcite

A magnesium-aluminum hydrotalcite and magnesium-aluminum technology, which is applied in the field of hydrotalcite, can solve the problems of poor crystallinity, complicated methods, and high cost of magnesium-aluminum hydrotalcite, and achieve the effects of low price, wide sources, and high crystallinity

Active Publication Date: 2017-05-31
LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the method for preparing magnesium-aluminum hydrotalcite in the prior art is complicated, the cost is high, and the crystallinity of the obtained magnesium-aluminum hydrotalcite is poor, and a kind of magnesium-aluminum hydrotalcite and the method for preparing magnesium-aluminum hydrotalcite are provided

Method used

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  • Magnesium aluminum hydrotalcite and method for preparing magnesium aluminum hydrotalcite
  • Magnesium aluminum hydrotalcite and method for preparing magnesium aluminum hydrotalcite
  • Magnesium aluminum hydrotalcite and method for preparing magnesium aluminum hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) Preparation of sol precursor

[0067] Add 50g of activated magnesium oxide (purchased from Haicheng Huasheng Refractory Co., Ltd., the brand is 90, the same below) into the ball mill tank, add 500ml of water, and pass through the ball mill at a speed of 800r / min for 2 hours to obtain the sol precursor;

[0068] (2) Preparation of magnesium-aluminum composite sol

[0069] Take 100ml of sol precursor, add water to dilute to 2L, add 150g magnesite (purchased from Haicheng Huasheng Refractory Co., Ltd., the brand is 40-70, the same below) and 60g aluminum hydroxide (purchased from Luoyang Zhongchao New Material Co., Ltd. The brand name of the joint stock company is AH-01DG, the same below); after stirring evenly, 5g of acetic acid + 3g of oxalic acid were added to it, and kept at 80°C for 30min to obtain a magnesium-aluminum composite sol. The pH value of the magnesium-aluminum composite sol is 4.3;

[0070] (3) Preparation of magnesium aluminum hydrotalcite slurry by...

Embodiment 2

[0075] (1) Preparation of sol precursor

[0076] Add 50 g of active magnesium oxide into a ball mill jar, add 150 ml of water, and mill for 2 hours at a speed of 800 r / min in a ball mill to obtain a sol precursor.

[0077] (2) Preparation of magnesium-aluminum composite sol

[0078] Take 100ml of sol precursor and add water to dilute to 2L, add 100g of magnesite, 30g of active magnesium oxide and 60g of aluminum hydroxide to it; stir evenly, add 5g of oxalic acid and 2ml of nitric acid with a concentration of 3mol / L to it, at 30°C Insulated for 300 minutes to obtain magnesium-aluminum composite sol. The pH value of the magnesium-aluminum composite sol is 3.8;

[0079] (3) Preparation of magnesium aluminum hydrotalcite slurry by hydrothermal method

[0080] The magnesium-aluminum composite sol that step (2) obtains is joined in the autoclave (pressure is 2MPa), and adds 54g Na wherein 2 CO 3 and 30g of sodium acetate, hydrothermally reacting at 220°C for 2h, after filterin...

Embodiment 3

[0084] (1) Preparation of sol precursor

[0085] Add 30g of activated magnesium oxide and 20g of aluminum hydroxide into a ball mill jar, add 250ml of water, and mill for 2 hours at a speed of 800r / min in a ball mill to obtain a sol precursor.

[0086] (2) Preparation of magnesium-aluminum composite sol

[0087] Take 100ml of the sol precursor and dilute it to 2L with water, add 150g of magnesite and 60g of aluminum hydroxide to it; stir well, add 2ml of hydrochloric acid with a concentration of 3mol / L and 3g of oxalic acid into it, and keep it at 50°C for 60min to obtain magnesium aluminum Composite sol. The pH value of the magnesium-aluminum composite sol is 4.3.

[0088] (3) Preparation of magnesium aluminum hydrotalcite slurry by hydrothermal method

[0089] Add the magnesium-aluminum composite sol obtained in step (2) into a high-pressure reactor (pressure of 0.5MPa), and add 65g of oxalic acid and 20g of citric acid to it, and conduct a hydrothermal reaction at 150°C ...

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Abstract

The present invention relates to the field of the hydrotalcite, discloses magnesium aluminum hydrotalcite and a method for preparing the magnesium aluminum hydrotalcite, the method comprises the following steps: (1) in the presence of water, performing ball-milling on a magnesium source and / or aluminum hydroxide to obtain a sol precursor; (2) diluting the sol precursor with water, mixing the diluted solution with the magnesium source and / or aluminum hydroxide, contacting the obtained mixture with an acid matter, and thermally insulating at 30-90 DEG C for 10-300min to obtain a magnesium aluminum composite sol; (3) under hydrothermal reaction conditions, contacting the magnesium aluminum composite sol with a crystal form control agent to obtain magnesium aluminum hydrotalcite paste; and (4) contacting the magnesium aluminum hydrotalcite paste with a surface modification agent for reaction. The method has the advantages of simple process and low cost, and can improve the crystallinity of the magnesium aluminum hydrotalcite.

Description

technical field [0001] The invention relates to the field of hydrotalcite, in particular to a magnesium aluminum hydrotalcite and a method for preparing the magnesium aluminum hydrotalcite. Background technique [0002] Hydrotalcite is a layered columnar double metal hydroxide, which is a kind of anionic clay that has developed rapidly in recent years. Hydrotalcite has special structure and physical and chemical properties, such as basicity, charging properties, anion exchangeability, microporous structure, thermal stability, memory effect, adsorption performance, catalytic performance, etc. Combustion agent, heat stabilizer, catalyst, catalyst carrier, insecticide, sewage treatment agent, electrorheological regulator, medicine, medicine carrier and petroleum industry have a wide range of applications. Magnesium aluminum hydrotalcite is a new type of multi-effect plastic additive. As a flame retardant, it has multiple functions of flame retardant, smoke elimination and fill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00C08K9/04C08K9/06C08K3/26
CPCC08K3/26C08K9/04C08K9/06C01P2002/72C01P2002/88C01P2004/61C01P2006/12C01F7/785
Inventor 王晓卡王茜裴广斌闫启苗龙强
Owner LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD
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