Method and device for synthesizing superfine magnesium hydrate fire retardant

A technology of ultra-fine magnesium hydroxide and flame retardant, applied in the direction of magnesium hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., to achieve the effects of shortening mixing time, good dispersion, and improving microscopic mixing efficiency

Active Publication Date: 2013-04-17
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the above-mentioned different shortcomings in existing magnesium hydroxide synthesis methods, and provides a synthetic ultra-fine magnesium hydroxide flame retardant with the advantages of strengthening the mixing efficiency of reactants, making the product dispersible, and uniform particle size distribution. method and device

Method used

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  • Method and device for synthesizing superfine magnesium hydrate fire retardant
  • Method and device for synthesizing superfine magnesium hydrate fire retardant
  • Method and device for synthesizing superfine magnesium hydrate fire retardant

Examples

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Effect test

Embodiment 1

[0041] Adopt technological process of the present invention to attach figure 1 , put the prepared magnesium chloride solution with a concentration of 0.5 mol / L in storage tank I, and put the sodium hydroxide solution with a concentration of 1.0 mol / L in storage tank II. Turn on the hypergravity reactor, and control the speed of the hypergravity reactor at 900r / min by adjusting the frequency converter. Turn on the corrosion-resistant pump, and control the volume flows of the magnesium chloride solution and the sodium hydroxide solution at 20L / h and 20L / h, respectively, by adjusting the flowmeter. The liquid-liquid contact reaction was carried out in a high-gravity reactor, the reaction temperature was controlled at 50°C, and the reaction time was 0.5h. The magnesium hydroxide slurry synthesized through the above steps is filtered, washed, dried and ground to obtain a magnesium hydroxide product with an average particle diameter of 17.0 nm.

Embodiment 2

[0043] Adopt technological process of the present invention to attach figure 1 , put the prepared magnesium chloride solution with a concentration of 2.0 mol / L in storage tank I, and put the sodium hydroxide solution with a concentration of 4.0 mol / L in storage tank II. Turn on the supergravity reaction device, and control the speed of the supergravity reactor at 1500r / min by adjusting the frequency converter. Turn on the corrosion-resistant pump, control the volume flow rate of magnesium chloride solution and sodium hydroxide solution at 120L / h and 120L / h respectively, carry out liquid-liquid contact reaction in the supergravity reactor, control the reaction temperature at 80°C, and the reaction time is 2.5h. The magnesium hydroxide slurry synthesized by the above steps is filtered, washed, dried and ground to obtain a magnesium hydroxide product with an average particle diameter of 10.0 nm.

Embodiment 3

[0045] Adopt technological process of the present invention to attach figure 1 , put the prepared magnesium chloride solution with a concentration of 1.0mol / L in the liquid storage tank I, put the sodium hydroxide solution with a concentration of 2mol / L in the liquid storage tank II, turn on the supergravity reaction device, and adjust the frequency converter The rotating speed of the supergravity reactor is controlled at 1200r / min. Turn on the corrosion-resistant pump, control the volume flow rate of magnesium chloride solution and sodium hydroxide solution at 90L / h and 90L / h respectively, and carry out liquid-liquid contact reaction in the supergravity reactor. The reaction temperature is controlled at 70°C, and the reaction time is 1.0h. The magnesium hydroxide slurry synthesized through the above steps is filtered, washed, dried and ground to obtain a magnesium hydroxide product with an average particle size of 7.0 nm.

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Abstract

The invention belongs to the technical field of the inorganic chemical industry, specifically relates to a method and a device for synthesizing a superfine magnesium hydrate fire retardant, and aims to solve the problem that existing magnesium hydrate synthesizing methods have respectively different disadvantages. The method comprises the steps that a magnesium chloride solution and a sodium hydroxide solution enter a liquid distributor from a liquid inlet of a supergravity reactor to realize first rapid uniform mixing and reacting, and then the solutions penetrate through a padding layer in a radial direction from inside to outside to realize second rapid uniform mixing and reacting. The device comprises the supergravity reactor, the liquid distributor of the supergravity reactor comprises a liquid inlet pipe I and a liquid inlet pipe II, the liquid inlet I is straight-pipe-shaped, the liquid inlet pipe II is straight-pipe-shaped and is provided with a 90-degree bend at the front end, and nozzles are formed at the front ends of the liquid inlet pipes. The device has the advantages that the structure is simple, the operation is simple and convenient, the device runs stably, the energy consumption is low, the technological design is reasonable, and the mixing efficiency of reactants can be enhanced, so that the product dispersibility is good, the grain size distribution is uniform, and the padding performance and the dispersing performance of the superfine magnesium hydrate fire retardant in a high polymer material are improved.

Description

field of invention [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a method and a device for synthesizing an ultrafine magnesium hydroxide flame retardant. Background technique [0002] With the rapid development of the polymer material industry, polymer materials such as plastics, synthetic rubber, and synthetic fibers are more and more widely used in building materials, home appliances, electronic equipment, automobiles, chemicals, transportation and other fields. However, the flammability of polymer materials has attracted more and more attention. According to statistics, more than 30% of fatal accidents in fires are caused by dense smoke and toxic gases produced by materials. Therefore, for flammable products, in addition to studying the flame retardant effect of adding flame retardants, low toxicity and low smoke are also indispensable indicators for flame retardants, which is also the most active topic i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/22B82Y30/00
Inventor 刘有智申红艳焦纬洲祁贵生袁志国栗秀萍张巧玲王建伟
Owner ZHONGBEI UNIV
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