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Preparation method for improving thermal stability of magnesium-aluminum hydrotalcite

A technology of magnesium-aluminum hydrotalcite and thermal stability, applied in the directions of hydrotalcite, chemical instruments and methods, aluminum compounds, etc., can solve the problems of high production cost, large degree of agglomeration, low crystallinity of magnesium-aluminum hydrotalcite, etc.

Active Publication Date: 2020-10-27
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of low crystallinity, poor thermal stability, high degree of agglomeration, and high production cost of magnesium aluminum hydrotalcite prepared by the above method, the present invention provides a preparation method for improving the thermal stability of magnesium aluminum hydrotalcite, which reduces the amount of waste water and improves the quality of samples. Excellent thermal stability and dispersion, reducing production costs

Method used

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  • Preparation method for improving thermal stability of magnesium-aluminum hydrotalcite
  • Preparation method for improving thermal stability of magnesium-aluminum hydrotalcite
  • Preparation method for improving thermal stability of magnesium-aluminum hydrotalcite

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Experimental program
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Effect test

Embodiment 1

[0031] Weigh 29g of magnesium hydroxide (D50=4.0μm), 15.6g of aluminum hydroxide (D50=5.0μm), n(Mg / Al)=2.1, add 145g of water and stir evenly, heat to 65°C, drop into the solution Add 26.25 g of 60% nitric acid and continue stirring for 30 min. Transfer the material to a ball mill, grind at 400r / min for 80min, transfer the ball-milled material to a reaction flask, add dropwise a mixed alkali solution of liquid caustic soda and sodium carbonate until the pH is 12.2, and continue stirring for 30min. The material was transferred to a hydrothermal synthesis kettle for crystallization at 230°C for 24h. After the crystallization is completed, the sample is suction filtered, washed and dried to obtain magnesium aluminum hydrotalcite. The obtained magnesium aluminum hydrotalcite D50=650nm, the 1% dehydration temperature of the sample is 138°C, and the oil absorption of the sample is 40mL / 100g.

Embodiment 2

[0033] Weigh 29g of magnesium hydroxide (D50=1.5μm), 17g of aluminum hydroxide (D50=2μm), n(Mg / Al)=2.9, add 145g of water and stir evenly, heat to 65°C, and dropwise add 60 % nitric acid 26.25g, continue stirring for 30min. Transfer the material to a ball mill, grind for 120min at 400r / min, transfer the ball-milled material to a reaction flask, add dropwise a mixed alkali solution of liquid caustic soda and sodium carbonate until the pH is 11.9, and continue stirring for 30min. The material was transferred to a hydrothermal synthesis kettle for crystallization at 150°C for 16h. After the crystallization is completed, the sample is suction filtered, washed and dried to obtain magnesium aluminum hydrotalcite. The obtained magnesium aluminum hydrotalcite D50=450nm, the 1% dehydration temperature of the sample is 120°C, and the oil absorption of the sample is 75mL / 100g.

Embodiment 3

[0035] Weigh 29g of magnesium hydroxide (D50=3μm), 19.5g of aluminum hydroxide (D50=4μm), n(Mg / Al)=2.3, add 145g of water and stir evenly, heat to 65°C, and dropwise add 60 % nitric acid 26.25g, continue stirring for 30min. Transfer the material to a ball mill, grind at 400r / min for 60min, transfer the ball-milled material to a reaction flask, add dropwise a mixed alkali solution of liquid caustic soda and sodium carbonate until the pH is 11.5, and continue stirring for 30min. The material was transferred to a hydrothermal synthesis kettle for crystallization at 220°C for 20h. After the crystallization is completed, the sample is suction filtered, washed and dried to obtain magnesium aluminum hydrotalcite. The D50 of the magnesium aluminum hydrotalcite obtained through detection is 620nm, the water loss temperature of the sample is 133°C, and the oil absorption of the sample is 53mL / 100g.

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Abstract

The invention discloses a preparation method for improving the thermal stability of magnesium-aluminum hydrotalcite. The preparation method comprises the following steps: using magnesium hydroxide andalpha-phase aluminum hydroxide products as raw materials, carrying out acid dissolution-ball milling-alkali precipitation-crystallization process flow to prepare the magnesium-aluminum hydrotalcite product with high thermal stability. Aiming at the problem that a large amount of salt-containing wastewater is generated in the production process due to the fact that soluble magnesium salt / aluminumsalt is used as a raw material in a traditional process, a magnesium source / aluminum source is innovatively improved, a production technology combining a physical method and a chemical method is designed, and the prepared magnesium-aluminum hydrotalcite product has the advantages of being high in thermal stability, good in dispersity and the like.

Description

technical field [0001] The invention relates to the field of inorganic chemical industry, in particular to a preparation method of magnesium aluminum hydrotalcite. Background technique [0002] Magnesium aluminum hydrotalcite (Mg 6 al 2 (OH) 16 CO 3 4H 2 O) is a layered double metal hydroxide with unique structure and properties, such as acidity and alkalinity, interlayer anion exchangeability, memory effect, thermal stability, adsorption, composition and structure controllability, Flame retardancy, etc., make magnesium aluminum hydrotalcite widely used in the fields of catalysis, sewage treatment, medicine, paint coating and flame retardant materials. In particular, as an environmentally friendly flame retardant, magnesium aluminum hydrotalcite has the advantages of high efficiency, non-toxicity, and low smoke. The current methods for preparing magnesium aluminum hydrotalcite mainly include coprecipitation, hydrothermal method, ion exchange method, roasting Reduction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00
CPCC01P2004/62C01P2006/19C01P2002/88C01P2002/22C01F7/785
Inventor 翟云鸽刘启奎刘中海任倩鲁琳琳
Owner QINGDAO UNIV OF SCI & TECH
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