Process for preparing high dispersivity square blocky superfine magnesium hydroxide by one-step method

A high-dispersion, magnesium hydroxide technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of reduced processing performance and product quality, poor compatibility with high polymers, and uneven particle size distribution, achieving narrow and uniform distribution range Dispersion, the effect that the equipment is easy to achieve

Inactive Publication Date: 2011-10-12
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, ordinary magnesium hydroxide has many disadvantages as a flame retardant: it has poor compatibility with polymers, and it is easy to reduce the processing performance and product quality when it is added in a large amount to the matrix material.
There are still disadvantages such as long process, high temperature and pressure, small product output and high production cost.
The present invention aims at the deficiencies of the traditional process, and proposes a more reasonable process method, so as to solve the problems of complex process flow, high energy consumption, large particle size of the product, uneven particle size distribution, and uneven crystal form.

Method used

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  • Process for preparing high dispersivity square blocky superfine magnesium hydroxide by one-step method
  • Process for preparing high dispersivity square blocky superfine magnesium hydroxide by one-step method
  • Process for preparing high dispersivity square blocky superfine magnesium hydroxide by one-step method

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Effect test

Embodiment 1

[0030] Prepare a 1.0mol / L refined magnesium chloride solution, take 500mL of this solution and add it to a bubbling reactor with a volume of 2000mL, stir the solution in the reactor and control its temperature at 70°C, and directly pass ammonia gas into the reaction in the form of bubbling The solution was subjected to magnesium precipitation reaction, the flow rate of ammonia gas was 0.20g / min, the pH value of the reaction solution was about 9.5 at 70°C for 2 hours at a constant temperature, and a milky white suspension of magnesium hydroxide and ammonium salt was obtained. The product solution was aged at a constant temperature of 70°C for 2 hours, and the aged product solution was vacuum filtered. The filter cake was washed with deionized water for 3 times and then vacuum-dried at 80°C for 12 hours to obtain loose tetragonal fine hydrogen Magnesium oxide powder. The filtrate is returned to the ammonia distillation device, and an appropriate amount of magnesium source is sup...

Embodiment 2

[0032] Prepare 2.0mol / L refined magnesium chloride solution, take 500mL of this solution and add it to a bubbling reactor with a volume of 2000mL, stir the solution in the reactor and control its temperature at 90°C, and directly pass ammonia gas into the reaction in the form of bubbling The solution was subjected to magnesium precipitation reaction, the flow rate of ammonia gas was 0.50g / min, and the pH value of the reaction solution was about 9.5 at a constant temperature of 90°C for 3 hours to obtain a milky white suspension of magnesium hydroxide and ammonium salt. The product solution was aged at 70°C for 1 hour, vacuum filtered the aged product solution, and the filter cake was washed with deionized water for 3 times and then vacuum-dried at 80°C for 12 hours to obtain loose tetragonal fine hydrogen Magnesium oxide powder, particle average diameter D 50 About 0.7μm, the largest particle size (secondary particle) is less than 5.0μm.

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Abstract

The invention provides a process for preparing high dispersivity square blocky superfine magnesium hydroxide by a one-step method, which relates to a process for preparing a chemical material. The process comprises the following steps of: taking magnesium chloride as a raw material; preparing solution of the magnesium chloride; reacting the solution of the magnesium chloride with ammonia gas passed in at a certain speed rate in a bubbling reactor with stirring; controlling the stirring speed and the reaction temperature; and after the reaction, performing constant temperature aging, filtration washing and drying on reaction solution to obtain incompact square blocky (hexahedral structure) superfine magnesium hydroxide powder. An ammonium salt in filtrate can be used for preparing the ammonia gas used in the process of magnesium deposition through ammonia evaporation reactions so as to realize ammonia circulation. The process realizes a technique for synthesizing a magnesium hydroxide fire retarding agent through the one-step method at the normal temperature under a condition that no auxiliary agent is used. Besides, the process has good product quality, needs no hydro-thermal treatment, has simple operating steps, less equipment occupied area, low production cost and small pollutant discharge amount, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a process for preparing chemical materials, in particular to a new process for preparing a high-dispersion tetragonal block-shaped fine particle magnesium hydroxide flame retardant in one step. Background technique [0002] With the rapid development and wide application of polymer material production, its flammability has also attracted people's attention. In order to solve the flame retardant and smoke suppression problems of polymer materials, people have developed flame retardant products such as halogen-based, phosphorus-based and metal-inorganic flame retardants. Although halogen-based and phosphorus-based flame retardants have good flame retardant effects, they will produce toxic and corrosive gases when burned, so their applications are increasingly restricted. Magnesium hydroxide (MH), as a "green" inorganic flame retardant, has the advantages of non-volatility, non-corrosion, no toxic gas, high decomposition temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/20C09K21/02C08K3/22
Inventor 刘云义李雪范天博马超李治涛
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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