Method for preparing transparent aluminum hydroxide liquid dispersion

An aluminum hydroxide, liquid phase dispersion technology, applied in the chemical field, can solve the problems of serious powder particle agglomeration, particle agglomeration, complex preparation process, etc., and achieve the effect of simplifying the process production process, avoiding agglomeration and enhancing stability

Active Publication Date: 2016-11-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum hydroxide grains with high purity and different forms can be prepared by this method, but the defect of this method is that although the agglomeration of ultrafine aluminum hydroxide particles is controlled by adding a dispersion modifier and the surface is modified, the The particle size of the final product is still distributed in the order of microns
This method has obvious shortcomings: the whole preparation process is too complicated, and the prepared powder particles are seriously agglomerated, so it can be seen that even if the modified powder material is compounded with (polymeric) polymer materials, it is extremely difficult It is easy to cause agglomeration between particles, which will affect the mechanical properties and flame retardancy of composite materials, which is also a defect that most powder materials are difficult to overcome
However, the disadvantage of this method is that the aqueous dispersion obtained by this process is not a transparent dispersion, which will greatly affect the optical properties of the flame retardant material and inhibit its application on optical devices, and the aqueous dispersion obtained by this method Dispersion requires the help of surfactants to achieve stable dispersion

Method used

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  • Method for preparing transparent aluminum hydroxide liquid dispersion
  • Method for preparing transparent aluminum hydroxide liquid dispersion
  • Method for preparing transparent aluminum hydroxide liquid dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Adopt anhydrous aluminum chloride preparation 1000g concentration to be the aluminum chloride aqueous solution of 30wt% and transfer in the aluminum salt solution storage tank; Adopt the 28wt% strong ammonia water preparation 1600g concentration to be the ammonia solution of 18wt% and transfer in the lye storage tank ; Turn on the high-gravity rotating packed bed device and adjust the rotor speed to 1500rpm; turn on the feed pump to transport the aluminum salt solution and lye to the inside of the rotating bed for precipitation and crystallization reaction, and control the feed line speed of the aluminum salt solution to 3.5m / s, the feeding linear velocity of the lye is 5.6m / s, and the reaction temperature is 65°C; after the feeding of the two raw material liquids is completed, close the high-gravity rotating packed bed device, and collect the All the obtained suspensions were transferred into the hydrothermal reaction kettle; the hydrothermal reaction kettle was sealed...

Embodiment 2

[0070] Adopt aluminum chloride hexahydrate preparation 1800g concentration to be the aluminum chloride aqueous solution of 1.4wt% and transfer in the aluminum salt solution storage tank; Adopt sodium hydroxide preparation 2250g concentration to be the sodium hydroxide aqueous solution of 1wt% and transfer to the lye storage tank Middle; turn on the high-gravity rotating packed bed device and adjust the rotor speed to 2000rpm; turn on the feed pump to transport the aluminum 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 aluminum salt solution to 7.2 m / s, the feeding linear velocity of the lye is 9m / s, and the reaction temperature is 25°C; after the feeding of the two raw material liquids is completed, close the high-gravity rotating packed bed device, and collect the All the obtained suspensions were transferred into the hydrothermal reaction kettle; the hydrothermal reaction kettl...

Embodiment 3

[0074] It is the aluminum nitrate ethanol solution of 10wt% that adopts nonahydrate aluminum nitrate preparation 1600g concentration and changes in the aluminum salt solution storage tank; The potassium hydroxide ethanol solution that adopts potassium hydroxide preparation 2000g concentration is 6wt% and changes in the lye storage tank ; Turn on the supergravity rotating packed bed device and adjust the rotor speed to 3000rpm; turn on the feed pump to transport the aluminum salt solution and lye to the inside of the rotating bed for precipitation and crystallization reaction, and control the feed linear velocity of the aluminum salt solution to 5m / s, the feeding linear velocity of the lye is 6.25m / s, and the reaction temperature is 45°C; after the feeding of the two raw material liquids is completed, close the high-gravity rotating packed bed device, and collect the All the suspensions were transferred into the hydrothermal reaction kettle; the hydrothermal reaction kettle was...

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Abstract

The invention relates to a method for preparing transparent aluminum hydroxide liquid dispersion. The method comprises the following steps: 1) dissolving an aluminum salt in water or in an organic solvent to prepare an aluminum salt solution and dissolving alkali in water or in another organic solvent so as to prepare alkali liquor; 2) adding the aluminum salt solution and the alkali liquor into a hypergravity rotation packed bed or sleeve type annular micro-channel reactor for precipitation and crystallization so as to prepare an aluminum hydroxide precursor suspension; 3) transferring the aluminum hydroxide precursor suspension into a hydro-thermal reaction vessel for water/solvent heat treatment; 4) subjecting slurry obtained after water/solvent heat treatment to standing, cooling, filtering and washing so as to obtain a filter cake; and 5) dispersing the cleaned filter cake in a liquid medium so as to obtain the transparent aluminum hydroxide liquid dispersion. The transparent aluminum hydroxide liquid dispersion prepared in the invention has good stability and has the characteristics of high ZETA potential, obvious Tyndall effect and thixotropic gelation.

Description

technical field [0001] The invention relates to the technical field of chemical industry. More specifically, it relates to a method for preparing a liquid phase dispersion, in particular to a method for preparing a transparent aluminum hydroxide liquid phase dispersion. Background technique [0002] Flame retardants are usually divided into two categories: organic and inorganic. As an important inorganic flame retardant, aluminum hydroxide has been widely used. Adding aluminum hydroxide to synthetic materials can make the material flame retardant, self-extinguishing and smoke extinguishing, which conforms to the development trend of high flame retardancy, low smoke and harmlessness in the flame retardant market. In addition, aluminum hydroxide can also be used as a paper-making filler, as a surface coating and to produce non-combustible paper; it can also be used as a toothpaste abrasive with good performance to replace the traditional raw materials chalk and dicalcium phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/34
CPCC01F7/34C01P2004/04C01P2004/24C01P2004/64C01P2006/22
Inventor 陈建峰陈博王洁欣曾晓飞夏怡朱楠
Owner BEIJING UNIV OF CHEM TECH
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