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Method for preparing transparent magnesium hydroxide liquid phase dispersion

A magnesium hydroxide, liquid phase dispersion technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of poor dispersion performance and compatibility, and achieve the effects of good stability, easy scale-up, and good product quality

Active Publication Date: 2014-07-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method for preparing a transparent magnesium hydroxide liquid phase dispersion; the method adopts a high-gravity rotating packed bed or a microchannel reactor, which can greatly enhance mass transfer and microscopic mixing, and the prepared The morphology of magnesium hydroxide particles is controllable and the particle size distribution is uniform. The solid content of the transparent magnesium hydroxide liquid phase dispersion obtained by further modifying the magnesium hydroxide particles prepared by this method is 1wt% to 50wt%. The crystal particle size is small and evenly distributed, and the one-dimensional size is 0.5-30nm; in addition, the product has good dispersion effect and good stability, and there is no sedimentation after standing for several months, and water and various organic solvents are used as the liquid dispersion medium. Extensive; this method solves the problem of poor dispersion and compatibility of nano-magnesium hydroxide in the application, thus endowing the product with higher application performance and added value

Method used

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  • Method for preparing transparent magnesium hydroxide liquid phase dispersion
  • Method for preparing transparent magnesium hydroxide liquid phase dispersion
  • Method for preparing transparent magnesium hydroxide liquid phase dispersion

Examples

Experimental program
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Effect test

Embodiment approach

[0063] 1. The high-gravity rotating packed-bed reactor used in the present invention is prior art, such as published patent (ZL95215430.7); the reaction flow diagram of an embodiment of the high-gravity rotating packed-bed reactor used in the present invention is as follows figure 1 As shown, the schematic diagram of the high-gravity rotating packed bed reactor is shown in figure 2 shown. The implementation is as follows:

[0064] Open the supergravity rotating device 7, and adjust the rotating speed to make the rotating speed in the supergravity device rotor reach a predetermined value. The magnesium salt solution in the magnesium salt solution storage tank 1 adopts the pump 2 and enters the magnesium salt solution feed port 18 in the supergravity rotating device after being metered by the flowmeter 3; the lye in the lye storage tank 4 adopts the pump 5 and After being measured by the flow meter 6, it is poured into the lye feed port 19 in the supergravity rotating device...

Embodiment 1

[0069] Add 1000 g of an ethanol solution with a mass concentration of magnesium chloride of 3.5% into the magnesium salt solution storage tank; add 1000 g of an ethanol solution with a mass concentration of sodium hydroxide of 1.23% into the lye storage tank; turn on the supergravity rotating device and adjust the speed to 1000 rpm; Turn on the feed pump, transport the magnesium salt solution and lye to the rotating bed at the same time for precipitation and crystallization reaction, and control the feed line speed of the magnesium salt solution and lye to be 5m / s, and control the temperature of the reaction system to 20°C ; After the magnesium salt solution and lye are fed, and the suspension obtained from the reaction flows out of the supergravity rotating device, close the supergravity rotating device, and gradually add 890mg N-β-(aminoethyl)- γ-Aminopropylmethyldimethoxysilane, the temperature of the modification tank is controlled at 60°C, and the modification time is 2 ho...

Embodiment 2

[0071]Add 1000 g of ethanol solution with a mass concentration of magnesium chloride of 10% in the magnesium salt solution storage tank; add 1800 g of ethanol solution with a mass concentration of potassium hydroxide of 5% in the lye storage tank; open the supergravity rotating device and adjust the rotating speed to 1800rpm; Turn on the feed pump, transport the magnesium salt solution and lye to the rotating bed at the same time for precipitation and crystallization reaction, and control the feed linear velocity of the magnesium salt solution to 2m / s, and the feed linear velocity of the lye to 3.6m / s , control the temperature of the reaction system to be 40°C; after the magnesium salt solution and alkali solution are fed, and the suspension obtained from the reaction flows out of the supergravity rotating device, close the supergravity rotating device, and gradually add 2.5g N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, the temperature of the modification tank is contro...

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Abstract

The present invention relates to a method for preparing a transparent magnesium hydroxide liquid phase dispersion. The method comprises: 1) dissolving a magnesium salt in water or an organic solvent to obtain a magnesium salt solution, and dissolving an alkali in water or an organic solvent to obtain an alkali solution; 2) adding the magnesium salt solution and the alkali solution to a supergravity rotation filling bed or a casing type annular micro-channel reactor to carry out a reaction to obtain a magnesium hydroxide suspension; 3) adding a surfactant to the magnesium hydroxide suspension to modify, and standing the obtained modified solution; and 4) filtering and washing the modified solution, and dispersing in a liquid phase medium to obtain the transparent magnesium hydroxide liquid phase dispersion. According to the present invention, the method is performed in the supergravity rotation filling bed or the casing type annular micro-channel reactor so as to substantially enhance mass transfer and enhance micro-mixing; the product is transparent and has good dispersity; the magnesium hydroxide crystal has characteristics of small particle side, uniform distribution, and one-dimensional size of 0.5-30 nm; and the prepared product has the solid content of 1-50 wt% and good stability, and does not produce settlement after standing for over 10 months.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a preparation method of a liquid phase dispersion, in particular to a method for preparing a transparent magnesium hydroxide liquid phase dispersion. Background technique [0002] As an important flame retardant, nano-magnesium hydroxide can make synthetic materials have flame retardant, self-extinguishing and smoke extinguishing properties after being added. In addition, nano-magnesium hydroxide can be used as a filler for rubber, plastic, paint and other polymer materials; in terms of environmental protection, it can be used as a flue gas desulfurizer, which can replace caustic soda and lime as a neutralizer for acid-containing wastewater; it can also be used as Additive for oil products, anti-corrosion and desulfurization; it can also be used in the electronics industry, medicine, sugar refining, thermal insulation materials and the manufacture of other magnesium salt p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/22
Inventor 陈建峰孙倩王洁欣曾晓飞张亮亮邹海魁
Owner BEIJING UNIV OF CHEM TECH
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