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Preparation process of magnesium hydroxide fire-retarding nanomaterial

A nano-magnesium hydroxide and preparation process technology, which is applied in the field of new preparation process of nano-magnesium hydroxide materials, can solve the problems of large particle size, complicated process, uneven distribution, etc., and achieve uniform particle size and particle size distribution , The effect of simple process steps

Inactive Publication Date: 2002-03-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the general magnesium hydroxide preparation process also has many disadvantages: in the process flow, the production process is long, the heat treatment time is long, the production output is small, the reaction temperature condition is high, the energy consumption is large, and the investment is large; Large and uneven distribution, difficult to control the shape and other shortcomings in the preparation, so the magnesium hydroxide powder produced by the traditional process often cannot meet the requirements of the modern polymer material industry for inorganic flame retardants
[0008] The purpose of the present invention is to solve the shortcomings of the traditional process of direct precipitation, such as complex process, high energy consumption, large particle size, uneven particle size distribution, and difficult to control the shape, and proposes a new method that can greatly strengthen the conventional process. A new production process based on a rotating packed bed (high gravity) reactor with high quality and enhanced micro-mixing

Method used

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  • Preparation process of magnesium hydroxide fire-retarding nanomaterial
  • Preparation process of magnesium hydroxide fire-retarding nanomaterial
  • Preparation process of magnesium hydroxide fire-retarding nanomaterial

Examples

Experimental program
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Effect test

Embodiment 1

[0047]In the liquid-liquid production mode, pour 30% magnesium salt solution and 20% industrial ammonia water into the liquid storage tank respectively, and heat up. The magnesium salt solution is controlled at 95°C, and the temperature of industrial ammonia is controlled at 35°C. Start the rotating packed bed and adjust the rotor speed to 700rpm. The magnesium salt solution and ammonia water are sent into the rotating packed bed according to the molar ratio of 1:2.5. Control the linear speed of the magnesium salt solution nozzle to 4m / s, and the industrial ammonia water nozzle speed to 7m / s to continuously feed into the rotating packed bed for reaction, with a pH value of 8.5, to obtain a suspension of magnesium hydroxide precipitate and ammonium salt. Then the magnesium hydroxide suspension was kept at 90°C by stirring the kettle, and the time was controlled at 120min. The resulting magnesium hydroxide suspension was filtered and washed 3 times with deionized water. Final...

Embodiment 2

[0049] In the liquid-liquid production mode, pour 30% magnesium salt solution and 20% industrial ammonia water into the liquid storage tank respectively, and heat up. The magnesium salt solution is controlled at 20°C, and the temperature of industrial ammonia is controlled at 20°C. Start the rotating packed bed and adjust the rotor speed to 1200rpm. The magnesium salt solution and ammonia water are sent into the rotating packed bed according to the molar ratio of 1:2.2. Control the linear speed of the magnesium salt solution nozzle to 4m / s, and the industrial ammonia water nozzle speed to 7m / s to continuously feed into the rotating packed bed for reaction, with a pH value of 8.5, to obtain a suspension of magnesium hydroxide precipitate and ammonium salt. Then the magnesium hydroxide suspension was kept at 90°C by stirring the kettle, and the time was controlled at 120min. The resulting magnesium hydroxide suspension was filtered and washed 3 times with deionized water. Fin...

Embodiment 3

[0051] In the liquid-liquid production mode, pour 30% magnesium salt solution and 20% industrial ammonia water into the liquid storage tank respectively, and heat up. The magnesium salt solution is controlled at 95°C, and the temperature of industrial ammonia is controlled at 30°C. Start the rotating packed bed and adjust the rotor speed to 1000rpm. The magnesium salt solution and ammonia water are sent into the rotating packed bed according to the molar ratio of 1:2.2. The linear speed of magnesium salt solution nozzle is controlled to be 6m / s, and the nozzle speed of industrial ammonia water is 10m / s to continuously feed into the rotating packed bed for reaction, the pH value is 8, and a suspension of magnesium hydroxide precipitate and ammonium salt is obtained. Then the magnesium hydroxide suspension was kept at 90°C by stirring the kettle, and the time was controlled at 120min. The resulting magnesium hydroxide suspension was filtered and washed 3 times with deionized w...

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Abstract

The present invention mainly is characterized by that it uses the magnesium chloride solution obtained by utilizing old bitter or magnesite through a refining process and industrial ammonia water or ammonia gas as raw material, or utilizes magnesium sulfate solution and industrial ammonia water or ammonia gas as raw material. Ultragravity (rotaryl filled bed) technology is adopted and utilizes liquid-liquid phase reaction or gas-liquid phase reaction mode is utilized to prepare nanometer magnesium hydroxide fire-retardant material. Said invention solves the defects of traditional process, such as complex process, high cost, non-uniform grain size and difficult control, etc.

Description

field of invention [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a new preparation process of nano magnesium hydroxide material. Background technique [0002] Magnesium hydroxide powder material is an inorganic, smoke-suppressing, non-toxic flame retardant, widely used in the field of high polymer flame retardant, suitable for polypropylene, polyethylene, polyvinyl chloride, EPDM rubber and unsaturated polyethylene Flame retardant and smoke suppression of polymer materials such as esters. As an inorganic flame retardant, magnesium hydroxide has the characteristics of good thermal stability, non-toxic, non-volatile, no corrosive gas, less smoke, no secondary pollution, etc. It is a low-halogen, halogen-free flame retardant The main types of the system. [0003] With the rapid development of the industrial application of polymer materials, the market demand for inorganic flame retardants is increasing. The largest sale...

Claims

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Application Information

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IPC IPC(8): C09K21/02
Inventor 宋云华陈建铭陈建峰
Owner BEIJING UNIV OF CHEM TECH
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