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A method for preparing nano aluminum hydroxide powder by electrochemical method

A technology of nano-aluminum hydroxide and aluminum hydroxide, applied in the direction of electrolysis process, electrolysis components, etc., can solve the problems of high raw material preparation cost, high equipment requirements, difficult particle size, etc., to achieve convenient production expansion, simple preparation process, The effect of strong economies of scale

Active Publication Date: 2015-08-26
成都华泽晶体材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own characteristics, but there are also some disadvantages, such as high cost of raw material preparation, difficulty in particle size control, easy powder agglomeration, complicated process operation, high equipment requirements, and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of the nano-aluminum hydroxide of the present embodiment is carried out according to the following steps: the aluminum plate after the surface treatment is used as the cathode and the anode at the same time, and placed in the benzyltrimethylammonium chloride electrolyte solution with a content of 200g / L, At pH 7-8, the current density is 3A / dm 2 , the temperature is 60°C, and the mechanical stirring gas supply volume is 800L / min. Electrolytic aluminum plate. When the solid content in the electrolyte reaches 28%, aluminum hydroxide powder is obtained after filtering the bath liquid; after washing the aluminum hydroxide powder, put it into a high-pressure container, and add pure water, crystal seeds and filter cake weight 5 % of citric acid; hydrothermal treatment was carried out at a constant temperature of 6 hours at a temperature of 200 °C and a pressure of 12 kg; the amount of pure water was 4 times the weight of the aluminum hydroxide powder; t...

Embodiment 2

[0028] The preparation method of the nano aluminum hydroxide of the present embodiment is carried out according to the following steps:

[0029] The surface-treated aluminum plate is used as the cathode and anode electrodes at the same time, placed in the electrolyte solution containing 400g / L choline chloride, at pH 8-10; current density 1A / dm 2 , the temperature is 30 ℃, and the electrolytic aluminum plate is under the condition of air stirring and air delivery rate of 100L / min. When the solid content in the electrolyte reaches 25%, filter the bath to obtain aluminum hydroxide powder; wash the aluminum hydroxide powder, put it into a high-pressure container, and add pure water, crystal seeds and aluminum hydroxide powder Citric acid with a body weight of 5% is subjected to hydrothermal treatment at a constant temperature of 100°C and a pressure of 10kg for 1 hour; the amount of pure water used is 3 times the weight of the aluminum hydroxide powder; the seed crystal is a nano...

Embodiment 3

[0032] The preparation method of the nano aluminum hydroxide of the present embodiment is carried out according to the following steps:

[0033] The surface-treated aluminum plate is used as the cathode and anode electrodes at the same time, and placed in the electrolyte solution containing benzyltriethylammonium chloride with a content of 400g / L. At pH 8-10, the current density is 5A / dm 2 , the temperature is 90°C, and the mechanical stirring air supply volume is 1000L / min to electrolytic aluminum plate. When the content of aluminum hydroxide powder in the electrolyte reaches 30%, filter the bath solution to obtain aluminum hydroxide powder; wash the aluminum hydroxide powder, put it into a high-pressure container, and add pure water, seed crystal and The tartaric acid with 10% weight of aluminum hydroxide powder is subjected to hydrothermal treatment at a temperature of 300°C and a pressure of 87kg at a constant temperature for 30 hours; the amount of pure water is 5 times t...

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Abstract

The invention discloses a method for preparing nanometer aluminum hydroxide powder by using an electrochemical method. The method for preparing the nanometer aluminum hydroxide powder by using the electrochemical method comprises the steps of: electrolyzing aluminum, and then washing, hydro-thermally processing, washing and drying electrolysate to obtain the nanometer aluminum hydroxide powder, wherein the particle size range is 10-80 nm. By adjusting a current, a voltage and a pH and adopting a hydro-thermal treatment technology, the method for preparing the nanometer aluminum hydroxide powder by using the electrochemical method realizes efficient control on the particle size of the aluminum hydroxide powder. The nanometer aluminum hydroxide powder obtained by the method is simple in preparation process, and short in production period; and the nanometer aluminum hydroxide powder is high in productivity and good in product stability, and has no pollution to the environment. The nanometer aluminum hydroxide powder prepared by the method is widely applied to the industries such as chemical industry, painting, building materials, wires, cables and rubber products.

Description

technical field [0001] The invention relates to a method for preparing aluminum hydroxide, in particular to a method for preparing nanometer aluminum hydroxide powder by an electrochemical method. Background technique [0002] Nano-aluminum hydroxide is an ultrafine particle with a particle size of 1-100nm. It has excellent characteristics in all aspects. It has been widely used as a new type of functional material and structural material in chemical industry, coatings, building materials, wires, cables and Rubber products and other industries. In recent years, with the development of powder surface treatment technology, the application of surface-activated nano-aluminum hydroxide powder as an inorganic flame retardant has made significant progress, and has become the most widely used flame retardant in the world. It can be widely used as advanced filler in flame retardant and filling of polymer materials. However, the preparation technology of nano-alumina hydroxide powde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00
Inventor 黄克宙李声泽李旻岳永刚何明利
Owner 成都华泽晶体材料有限公司
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