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Preparation method for nanometer magnesium oxide

A technology of nano-magnesium oxide and magnesium salt, which is applied in the direction of magnesium oxide, etc., can solve the problems of limiting the production and application of nano-magnesia, difficulty in obtaining ultra-fine magnesium oxide, and difficult control of process conditions. The effect of small diameter and uniform particle size distribution

Inactive Publication Date: 2009-05-13
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods have high requirements for equipment and technology, or difficult control of process conditions, or high raw material costs, or low yields, which limit the production and application of nano-magnesia
[0004] In the preparation of magnesia reported so far, most of the hydrothermal preparations require high temperature and high pressure reaction conditions, so the energy consumption is large, and it is difficult to obtain ultrafine magnesia

Method used

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  • Preparation method for nanometer magnesium oxide

Examples

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Effect test

Embodiment 1

[0012] Example 1: Take 0.4855g of magnesium chloride, dissolve it in 6ml of water in an autoclave with a volume of 20ml, then add 0.0179g of disodium ethylenediaminetetraacetic acid and stir to make solution A, and then weigh 0.3126g of sodium oxalate to make it 6ml of solution B, add B to A and mix evenly under stirring, hydrothermal reaction occurs at 160°C for 10 hours, after natural cooling, centrifugal washing until there is no chloride ion (tested with silver nitrate) to obtain the precursor, vacuum at room temperature After drying for 24 hours, the dried precursor was burned in a muffle furnace. This process was divided into two steps: the first step: burning at 450°C for 1.5h; the second step: raising the temperature to 600°C for 1.5h. That is, white nano-sized magnesium oxide crystals are obtained.

Embodiment 2

[0013] Example 2: Take 1.2108g of magnesium chloride, dissolve it in 7.5ml of water in an autoclave with a volume of 20ml, then add 0.0446g of disodium ethylenediaminetetraacetate and stir to form solution A, and then weigh 0.8064g of sodium oxalate to prepare Prepare 7.5ml of solution B, add B to A and mix evenly under stirring, hydrothermal reaction occurs at 100°C for 4 hours, and after natural cooling, centrifuge and wash until there is no chloride ion (tested with silver nitrate) to obtain the precursor. After vacuum drying at room temperature for 24 hours, the dried precursor is fired in a muffle furnace. This process is divided into two steps: the first step: burning at 400°C for 1 hour; the second step: raising the temperature to 600°C and burning for 2 hours. That is, white nano-sized magnesium oxide crystals are obtained.

Embodiment 3

[0014] Example 3: Take 1.5248g of magnesium chloride, dissolve it in 7ml of water in an autoclave with a volume of 20ml, then add 0.0559g of disodium ethylenediaminetetraacetic acid and stir to make solution A, and then weigh 1.005g of sodium oxalate to make it 7ml solution B, add B to A and mix evenly under stirring, hydrothermal reaction occurs at 100°C for 6 hours, after natural cooling, centrifuge and wash until there is no chloride ion (tested with silver nitrate) to obtain the precursor, vacuum at room temperature After drying for 24 hours, the dried precursor was burned in a muffle furnace. This process was divided into two steps: the first step: burning at 450°C for 1.5h; the second step: raising the temperature to 600°C for 1.5h. That is, white nano-sized magnesium oxide crystals are obtained.

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Abstract

This invention relates to a preparation method for MgO nm crystals, which takes soluble Mg salt as the source and adds surface active agent in it, takes sodium oxalate as the deposition agent to heat-react in a high pressure kettle for a period of time then to take out the precursor to deposit, centrifuge and clean it to be dried at normal temperature in vacuum, then burns the dried precursor in a muffle for a period of time to produce MgO nm crystals.

Description

technical field [0001] The invention relates to a method for preparing magnesium oxide nanocrystals, which belongs to the technical field of nanomaterial preparation. Background technique [0002] Nano-magnesia has special properties such as heat, light, electricity, mechanics, and chemistry that are different from those of bulk materials. Using nano-magnesia can achieve low-temperature sintering without using sintering aids, and it can be made into high-density fine-grained ceramics, which is expected to be developed It is a cutting-edge material under harsh conditions such as high temperature and high corrosive atmosphere; it can also be used as a sintering aid and stabilizer for other nanoparticles such as zirconia, alumina, iron oxide, etc. to obtain high-quality nano-ceramics. Nano-magnesium oxide has excellent UV shielding properties and is the most preferred material for the development of functional cosmetics, fibers and clothes. Nano magnesium oxide also has good a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/06
Inventor 王麟生卢荣丽胡炳元
Owner EAST CHINA NORMAL UNIV
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