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Nanometer magnesium hydroxide and preparation method thereof

A technology of nano-magnesium hydroxide and oxidation reaction, applied in the direction of magnesium hydroxide, nanotechnology, etc., can solve the problems of high cost and difficult large-scale application of magnesium/air batteries, achieve good uniformity, high purity, and enhance economic value Effect

Inactive Publication Date: 2017-06-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the deficiencies in the prior art, the high cost of magnesium / air batteries and the difficulty of large-scale application, and proposes a method for preparing nano-magnesium hydroxide that meets the needs of industrial applications by utilizing the reaction of magnesium / air (oxygen) batteries

Method used

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  • Nanometer magnesium hydroxide and preparation method thereof

Examples

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Embodiment 1

[0030] The magnesium / air battery uses 99.9% high-purity magnesium as the anode, and the cathode includes a catalytic layer, a hydrophobic diffusion layer and a current collector cathode, and the electrode area is 32cm 2 . The cathode catalytic layer is MnO with a mass loading of 60% 2 / C is the catalyst, PTFE is the hydrophobic agent, and the catalyst loading in the catalytic layer is 8mg cm -2 , the mass content of PTFE is 20%; the hydrophobic diffusion layer is graphitized carbon fiber felt after the hydrophobic treatment of PTFE emulsion, and the thickness is 3mm; PTFE accounts for 70% of the total mass of the hydrophobic diffusion layer; the current collecting layer is nickel foam. The electrolyte solution is sodium chloride aqueous solution with a mass fraction of 10%.

[0031] Magnesium / air battery at 0.5mA / cm 2 Discharge with a current density of 25°C. During the discharge process, a circulation pump is used to discharge the electrolyte and products to the product / el...

Embodiment 2

[0033] Using the magnesium / air battery described in Example 1 to prepare nano-magnesium hydroxide.

[0034] Magnesium / air battery at 30mA / cm 2 Discharge with a current density of 50°C. During the discharge process, a circulation pump is used to discharge the electrolyte and products to the product / electrolyte storage tank. After the product is filtered through a 200-mesh nylon filter, a slurry-like magnesium hydroxide product is obtained. After the product was taken out from the liquid storage tank, it was rinsed with deionized water and filtered three times with a suction filter, and then dried in a drying oven at a temperature of 60°C for 12 hours to obtain image 3 The shown nano-magnesium hydroxide particles have a particle size of about 100-500nm and a flower-like structure.

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Abstract

The invention provides a preparation method for nanometer magnesium hydroxide. The preparation method comprises the following steps: (1) with a magnesium / air (oxygen) battery as a reactor, allowing magnesium to generate an electrochemical oxidation reaction; and (2) collecting a reaction product in the step (1), washing the collected reaction product, and carrying out filtering and drying treatment so as to obtain the nanometer magnesium hydroxide, wherein the magnesium / air (oxygen) battery comprises high-purity magnesium with an anode purity higher than 99.9%, a cathode catalytic layer with carbon loaded manganite as a catalyst, and a neutral saline water electrolyte; and the magnesium / air (oxygen) battery comprises a product storage device. The nanometer magnesium hydroxide prepared by using the method provided by the invention has the advantages of high purity, good uniformity, etc.; by adopting the magnesium / air (oxygen) battery as the reactor to prepare the nanometer magnesium hydroxide, a nanometer magnesium hydroxide product is obtained, and power generation or power storage is realized at the same time; thus, large-scale application of the magnesium / air battery is realized, and economic values of the battery is improved.

Description

technical field [0001] The invention relates to a method for preparing nano magnesium hydroxide, in particular to a method for preparing nano magnesium hydroxide using a magnesium / air (oxygen) battery as a reactor. Background technique [0002] Magnesium hydroxide has the properties of flame retardancy, smoke elimination and filling, and is a "halogen-free" inorganic flame retardant. It also has the characteristics of non-volatility, non-corrosion, and no toxic gas generation, and is environmentally friendly. Ultrafine is the main development direction of magnesium hydroxide inorganic flame retardants. Ultrafine particles help the dispersion of magnesium hydroxide particles in plastics, thereby reducing the amount of magnesium hydroxide and reducing the impact of adding magnesium hydroxide on plastics. performance impact. The annual demand for magnesium hydroxide inorganic flame retardant added to plastics in my country reaches tens of thousands of tons, but the actual prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14B82Y40/00
CPCC01F5/14B82Y40/00
Inventor 孙公权王二东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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