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Surface coating modified boehmite and preparation method thereof

A surface coating and boehmite technology, applied in the direction of alumina/hydroxide, etc., can solve the problems of toxicity and danger, unfavorable modification operation, poor modification effect, etc., to solve the problem of poor product dispersibility, The effect of clear shape and improved dispersion

Inactive Publication Date: 2015-04-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many methods for powder wet surface modification, but since most modifiers are organic substances that are easily hydrolyzed, the modification effect of water as a solvent is poor
Modification using organic matter as a solvent is toxic and dangerous, which is not conducive to the modification operation, and the modification cost is high

Method used

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  • Surface coating modified boehmite and preparation method thereof
  • Surface coating modified boehmite and preparation method thereof
  • Surface coating modified boehmite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Weigh 60g of aluminum sulfate (Al 3 SO 4 18H 2 O) be dissolved in 300ml deionized water to obtain aluminum sulfate solution, take by weighing 23g sodium hydroxide (NaOH) and be dissolved in 200ml deionized water to obtain sodium hydroxide solution, under constant stirring, sodium hydroxide solution is slowly dripped into aluminum sulfate solution until the pH value is 9, to obtain aluminum hydroxide suspension;

[0023] 2) Move the aluminum hydroxide suspension into an autoclave, react at 180°C for 3 hours, then cool to room temperature, and centrifuge and wash with deionized water until the filtrate is detected to be free of sulfate ions with a barium chloride solution, and then the filter cake is directly dispersed in 100ml Deionized water, stir rapidly at room temperature for 2 hours to form a uniform suspension, the pH of the suspension is 7;

[0024] 3) Take 0.3 g of polyethylene glycol with a molecular weight of 6000 and dissolve it in 10 ml of deionized wat...

Embodiment 2

[0027] 1) Weigh 60g of aluminum sulfate (Al 3 SO 4 18H 2 O) be dissolved in 300ml deionized water to obtain aluminum sulfate solution, take by weighing 23g sodium hydroxide (NaOH) and be dissolved in 200ml deionized water to obtain sodium hydroxide solution, under constant stirring, sodium hydroxide solution is slowly dripped into aluminum sulfate solution until the pH value is 9, to obtain aluminum hydroxide suspension;

[0028] 2) Move the aluminum hydroxide suspension into an autoclave, react at 230°C for 3 hours, then cool to room temperature, wash with deionized water, until the filtrate is detected to be free of sulfate ions with a barium chloride solution, and then directly disperse the filter cake in 100ml Deionized water, stir rapidly at room temperature for 2 hours to form a uniform suspension, the pH of the suspension is 7;

[0029] 3) Take 0.3 g of polyethylene glycol with a molecular weight of 6000 and dissolve it in 10 ml of deionized water, then add it to the...

Embodiment 3

[0032] 1) Weigh 60g of aluminum sulfate (Al 3 SO 4 18H 2 O) be dissolved in 300ml deionized water to obtain aluminum sulfate solution, take by weighing 23g sodium hydroxide (NaOH) and be dissolved in 200ml deionized water to obtain sodium hydroxide solution, under constant stirring, sodium hydroxide solution is slowly dripped into aluminum sulfate solution until the pH value is 9, to obtain aluminum hydroxide suspension;

[0033] 2) Move the aluminum hydroxide suspension into an autoclave, react at 180°C for 3 hours, then cool to room temperature, wash with deionized water, until the filtrate is detected to be free of sulfate ions with a barium chloride solution, and then directly disperse the filter cake in 400ml Deionized water, stir rapidly at room temperature for 2 hours to form a uniform suspension, the pH of the suspension is 7;

[0034] 3) Take 0.2g of polyethylene glycol and dissolve it in 10ml of deionized water, then add it to the suspension obtained in step 2), s...

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Abstract

The invention discloses a surface coating modified boehmite having high crystallinity and good dispersity and a preparation method thereof, belonging to the technical field of preparation of inorganic powder nano materials. The method comprises the following steps: by taking water as solvent, aluminum sulfate as an aluminum source and sodium hydroxide as a precipitating agent, performing hydrothermal reaction to obtain a boehmite suspension having high crystallinity; and then by taking water as solvent, polyethyleneglycol as modifier and borax as initiator, performing surface coating modification on the undried boehmite obtained through the hydrothermal reaction to change the surface properties, thus improving the dispersity and particle size of the boehmite powder. According to the invention, water is taken as the solvent, thereby avoiding the toxicity and risk caused by the use of organic solvent and the environmental pollution problem. The surface coating modified boehmite powder obtained by the invention is uniform and small in particle size distribution, high in crystallinity, favorable in dispersity and clearly laminar in morphology. The preparation method is simple to operate, lowers the cost of the modification process and solves the problem that the product is poor in dispersity in the existing dry modification process.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic powder nanometer materials, in particular to a surface-coated modified boehmite with high crystallinity and good dispersibility and a preparation method thereof. Background technique [0002] Alumina has the advantages of high temperature resistance, wear resistance, good thermal conductivity, stability, and low cost. It is widely used in industrial ceramics, medicine, electromagnetism, catalysts, etc. There are many methods for preparing alumina. Among them, boehmite (γ-AlOOH), also known as boehmite, is a common precursor for preparing alumina by precipitation method, and boehmite is a kind of bauxite, which can be used as building materials. The preparation of boehmite with excellent properties is the basis for the synthesis of high-quality ultrafine alumina. At present, there are many methods for preparing boehmite, including precipitation method, sol-suspension method, and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 金鑫朱梅琴
Owner BEIJING UNIV OF CHEM TECH