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Technology of transforming common magnesium hydrexide into hexagonal sheel shaped magnesium hydroxide by hydrothermal method

A magnesium hydroxide, hexagonal flake technology, applied in magnesium hydroxide and other directions, can solve the problems of high industrialization cost, poor conversion effect, low slurry concentration, etc.

Active Publication Date: 2006-09-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conversion effect obtained by different conversion agents is not the same; but in general, conversion agents such as water, magnesium chloride, ammonium chloride, and ammonium hydroxide have poor conversion effects and unstable product quality; sodium hydroxide is used as the conversion agent, and the obtained The quality of the converted product is good, but its process is complicated, the reaction temperature and pressure are high, the concentration of lye is high, the concentration of slurry is low, and the cost of industrialization is high and difficult.

Method used

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Experimental program
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Embodiment Construction

[0038] A preparation process line of hexagonal flaky magnesium hydroxide: Weigh 226.7g of magnesium hydroxide (wet basis, moisture content 56.12%), mix it with the conversion agent solution, stir evenly, put it in a high-pressure reactor, and heat it at 140-200 React under the condition of ℃ for 2-6 hours, cool, filter, wash, dry and crush to obtain 98.27 g of dry material with a yield of 98.79%. Scanned by a laser electron scanning microscope, the product is hexagonal flaky magnesium hydroxide with a good crystal shape and a specific surface area of ​​less than 10m 2 / g.

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Abstract

A process for preparing hexagonal flake type magnesium hydroxide from ordinary one by dydrothermal method includes such steps as proportionally mixing ordinary magnesium hydroxide with lithium hydroxide and / or potassium hydroxide, or their mixture with sodium hydroxide, stirring, hydrothermal reaction at 140-200 deg.C for 2-6 hr, cooling, filtering, washing, drying, and pulverizing.

Description

technical field [0001] The invention relates to a preparation process of a flame retardant, in particular to a preparation process of magnesium hydroxide, in particular to a process for converting ordinary magnesium hydroxide into hexagonal flake magnesium hydroxide by using a hydrothermal method. Background technique [0002] In recent years, with the continuous development of the material industry, especially polymer materials have become more and more common in people's daily life, people have higher and higher requirements for the fire performance of these materials. Magnesium hydroxide, as a new type of inorganic flame retardant with high efficiency, superiority and environmental protection, has been paid more and more attention by people. The appearance of magnesium hydroxide is white powder, which is non-toxic, tasteless and non-corrosive. It decomposes into magnesium oxide and water when heated. It can be widely used in polyvinyl chloride, polyethylene, high impact ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14
Inventor 陈大福李丽娟聂锋张志宏戈桦李和印梁天曙王海军胡守招
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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