Method for preparing flame retardant magnesium hydroxide

A technology of magnesium hydroxide and magnesium oxide, applied in magnesium hydroxide and other directions, can solve the problems of poor affinity, poor dispersibility and compatibility, easy agglomeration of particles, easy control of preparation conditions, less input equipment, The effect of short process flow

Active Publication Date: 2012-09-12
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Ordinary magnesium hydroxide is generally produced by synthetic method at room temperature. In industry, it is usually reacted in water with brine, brine flakes or ore containing magnesium chloride and alkaline substances (such as sodium hydroxide, potassium hydroxide, calcium hydroxide and ammonia water, etc.) The resulting magnesium hydroxide is easy to agglomerate, and the product is difficult to filter and wash
The magnesium hydroxide that makes is mostly hexagonal or amorphous cry

Method used

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  • Method for preparing flame retardant magnesium hydroxide
  • Method for preparing flame retardant magnesium hydroxide
  • Method for preparing flame retardant magnesium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] Weigh 100g of lightly burned magnesia and add it to 1000mL of 90℃ water containing composite dispersant (0.45g polyethylene glycol, 0.5g sodium oleate, 0.5g sodium lauryl sulfonate, 0.5g sodium stearate), Stir rapidly at 90°C, digest and keep for 1 hour to obtain a magnesium hydroxide emulsion. Then the obtained magnesium hydroxide emulsion was hydrothermally heated in an autoclave under the condition of controlling the reaction temperature of 160° C. for 23 hours and then cooled. The above-mentioned reacted slurry is suction filtered at room temperature and dried in an oven at 105° C. for 12 hours to obtain the target product flame-retardant magnesium hydroxide.

Example Embodiment

[0022] Example 2

[0023] Weigh 100g of lightly burned magnesia and add it to 700mL 90℃ water of composite dispersant (2.0g sodium stearate, 2.25g sodium dodecylbenzene sulfonate, 0.10g triammonium citrate), and stir quickly at 90℃ , Digestion and heat preservation for 1 hour to obtain magnesium hydroxide emulsion. Then the obtained magnesium hydroxide emulsion was hydrothermally heated for 2 hours and then cooled in an autoclave under the condition of controlling the reaction temperature at 200°C. The above-mentioned reacted slurry was suction filtered at room temperature and dried in an oven at 105° C. for 12 hours to obtain the target magnesium hydroxide.

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Abstract

The invention relates to a method for preparing flame retardant magnesium hydroxide. The method is characterized by using undercalcined magnesia powders as raw materials, adding the undercalcined magnesia powders into water containing a composite dispersing agent, stirring and hydrating at a certain temperature for a certain time, and performing a hydrothermal crystallization in a pressure reaction kettle for a certain time. Flame retardant magnesium hydroxide powders with a high dispersibility can be obtained by filtering and drying materials which are subjected to the hydrothermal crystallization, and a filter liquor can be added with a proper amount of water and the dispersing agent to be recycled as water and the dispersing agent in the hydrating. By means of the method, the prepared flame retardant magnesium hydroxide is flaky with the high dispersibility, and the defects of a poor dispersibility, a large specific surface area, easy conglomeration and the like of common magnesium hydroxide in materials such as plastics or rubbers and the like are overcome. According to the method, the sources of required raw materials are rich, the used device and process are simple, and the production cost is low. The prepared flame retardant magnesium hydroxide with the high dispersibility can be widely applied to various industrial production processes.

Description

technical field [0001] The invention belongs to the field of inorganic materials, in particular to a preparation method of flame-retardant magnesium hydroxide. Background technique [0002] Magnesium hydroxide, an inorganic flame retardant, has a special layered structure and is an additive-type flame retardant with high smoke suppression. It has functions such as non-toxicity, smoke elimination, anti-drip, filling, and flame retardancy. Environmentally friendly inorganic flame retardants have become a hot spot for research and development in recent years. [0003] Ordinary magnesium hydroxide is generally produced by synthetic method at room temperature. In industry, it is usually reacted in water with brine, brine flakes or ore containing magnesium chloride and alkaline substances (such as sodium hydroxide, potassium hydroxide, calcium hydroxide and ammonia water, etc.) The resulting magnesium hydroxide is easy to agglomerate, and the product is difficult to filter and wa...

Claims

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Application Information

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IPC IPC(8): C01F5/14
Inventor 吴智诚林璋林文文陈志黄丰
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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