Preparation method of highly pure magnesium hydroxide nanocrystal

A magnesium hydroxide and nanocrystalline technology, applied in the direction of magnesium hydroxide, can solve the problems of poor filtration performance, poor crystallinity, strong volatility of ammonia water in the operating environment, etc., and achieve the effect of facilitating mass production and low autoclave pressure

Inactive Publication Date: 2009-10-28
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
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Problems solved by technology

[0014] The disadvantage of this method is still that the product is a colloid with poor crystallinity, large specific surface area and easy to absorb and wrap a large number of impurity ions, resulting in low purity and poor filtration performance.
In addition, the operating environment is relatively harsh due to the strong volatility of ammonia water, and environmental protection issues are prominent

Method used

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  • Preparation method of highly pure magnesium hydroxide nanocrystal
  • Preparation method of highly pure magnesium hydroxide nanocrystal

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Embodiment 1

[0031] Embodiment 1: a kind of preparation method of high-purity magnesium hydroxide nanocrystal, its preparation method comprises the steps:

[0032] ①. Measure NaOH solution with a concentration of 2.0mol / L at room temperature and place it in a stainless steel container, and mix MgCl with a concentration of 1.0mol / L under constant stirring 2 ·6H 2 The O solution was added in batches and stirred for 20 minutes to make the mixed [OH - ] / 2[Mg 2+ ] molar ratio reaches 1.00;

[0033] ②. Transfer the mixed system into a high-pressure reactor, heat it up to 124°C, keep the pressure at 0.20Mpa, keep it warm for 2 hours, cool it naturally for 22 hours and age it in the reactor;

[0034] ③. Rinse the aged solid-liquid mixture twice on a Buchner funnel lined with medium-speed qualitative filter paper, and filter it with suction; put the filtered product into an oven for drying, drying conditions: 130°C×2hr; cool the product , weighed, and ground to obtain magnesium hydroxide nanocr...

Embodiment 2

[0036] Embodiment 2: a kind of preparation method of high-purity magnesium hydroxide nanocrystal, its preparation method comprises the steps:

[0037] Step 1. used alkali NaOH solution in embodiment 1 is replaced with KOH solution instead;

[0038] The remaining steps of a method for preparing high-purity magnesium hydroxide nanocrystals are the same as in Example 1. The size and purity of the product obtained are also the same as in Example 1.

Embodiment 3

[0039] Embodiment 3: a kind of preparation method of high-purity magnesium hydroxide nanocrystal, its preparation method comprises the steps:

[0040] ①. Measure NaOH solution with a concentration of 7.0mol / L at room temperature and place it in a stainless steel container, and mix MgCl with a concentration of 4.5mol / L under constant stirring 2 ·6H 2 The O solution was added in batches and stirred for 20 minutes to make the mixed [OH - ] / 2[Mg 2+] molar ratio reaches 1.30;

[0041] ②. Transfer the mixed system into a high-pressure reactor, heat up to 135°C, keep the pressure at 0.32Mpa, then keep it warm for 5 hours, cool naturally for 22 hours and age in the reactor;

[0042] ③. Rinse the aged solid-liquid mixture twice on a Buchner funnel lined with medium-speed qualitative filter paper, and filter it with suction; put the filtered product into an oven for drying, drying conditions: 130°C×2hr; cool the product , weighed, and ground to obtain magnesium hydroxide nanocrystal...

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Abstract

The invention relates to a preparation method of highly pure magnesium hydroxide nanocrystal, which comprises the steps of: mixing and evenly stirring NaOH solution and MgCl2.6H2O solution at room temperature, transferring the mixed material into a high-pressure reaction autoclave and heating to temperature of 124 DEG C to 135 DEG C, keeping the pressure at 0.20 Mpa to 0.32Mpa, then preserving the temperature for 3 hours to 5 hours, naturally cooling and aging, rinsing and suction-filtering the aged solid-liquid mixture on a Buchner funnel, drying the products after suction filtration in a drying oven, cooling and grinding the products, adding the obtained magnesium hydroxide nanocrystal to clean water, stirring, conducting ultrasonic processing and standing; and in such synthesis way, the magnesium hydroxide nanocrystal with purity of 99.2 percent to 99.9 percent, a shape of a hexagonal piece and granule size of 50nm to 100nm can be obtained.

Description

technical field [0001] The invention relates to the technical field of preparation of high-purity nanometer materials, in particular to a preparation method of high-purity magnesium hydroxide nanocrystals. Background technique [0002] With the continuous expansion of the application field of plastics, it has brought unexpected dangers and losses to human beings due to its flammability and high calorific value. Some time ago in the earthquake-stricken area of ​​Wenchuan, there was an incident that the fire-proof and flame-retardant performance of the temporary housing was exposed. Recently, the people in the country are deeply remembered. The north annex of the TV station's new building burned for nearly six hours before being extinguished, which highlighted the urgent problem that the flame retardancy of my country's building decoration materials is not up to standard. Throughout the developed countries, people have always paid great attention to and emphasized the flame re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/22
Inventor 许荣辉文九巴李洛利师力徐俊峰吴林林苏怀建王海平
Owner HENAN UNIV OF SCI & TECH
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