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Preparation method of highly-dispersed nano-magnesium hydroxide

A nano-magnesium hydroxide, high-dispersion technology, applied in the field of preparation, can solve the problems of large surface energy, strong particle agglomeration, uneven dispersion, etc., and achieve the effect of small particle size, simple synthesis process and mild reaction conditions

Active Publication Date: 2015-04-08
CHINA RES INST OF DAILY CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Surface modification treatment: Inorganic materials have strong surface polarity, small particles, large surface energy, strong particle agglomeration, poor compatibility with polymer materials, uneven dispersion in the material, and cannot achieve a certain flame retardancy Effect
Surface modifiers are mainly divided into surfactants and coupling agents in terms of structure and characteristics. Due to their amphiphilicity, surfactants may have a part of the loss during modification in water systems, which reduces the actual usage, and due to the surface The high price of the active agent increases the cost; and for the powder surface treatment with the coupling agent, the price of the commonly used coupling agent is high, and the water resistance is poor, and it must be diluted with an inert organic solvent before use (deteriorating the operating environment, and at the same time cause environmental pollution), or use dry modification, of course, this requires higher modification equipment
All of the above are synthesized in water system, and the process route is relatively long, but there are few methods for synthesizing highly dispersed nano magnesium hydroxide in one step in alcohol system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] At room temperature, weigh 18.2 g of tetramethylammonium hydroxide and dissolve it in 60 mL of absolute ethanol and mix evenly, then add it into a 250 ml three-neck flask, stir at 300 r / min, and control the temperature of the water bath at 20°C; weigh 25.6 Dissolve 1 g of magnesium nitrate hexahydrate in 60 mL of absolute ethanol and mix evenly to make solution B, then slowly add solution B into the third medium bottle, control the rate of addition so that the addition is completed within 1 h, then continue to stir for 0.5 h, After 0 h, filter with suction, wash with 800 ml of water and 20 ml of absolute ethanol, and dry the obtained filter cake in an oven at 120° C. for 1 h. The average particle size of the obtained nano-magnesium hydroxide powder is 7.2 nm.

Embodiment 2

[0021] At room temperature, weigh 18.2 g of tetramethylammonium hydroxide, dissolve it in 100 mL of absolute ethanol and mix evenly, then add it into a 250 ml three-neck flask, stir at 500 r / min, and control the temperature of the water bath at 40 °C; weigh 25.6 Dissolve 1 g of magnesium nitrate hexahydrate in 25 mL of absolute ethanol and mix evenly to make solution B, then slowly add solution B into the third medium bottle, control the rate of addition so that the addition is completed within 1 h, then continue to stir for 0 h, then Aging for 6 hours, suction filtration, washing with 800ml of water and 20ml of absolute ethanol, and drying the obtained filter cake in an oven at 120°C for 1 hour. The average particle size of the obtained nano-magnesium hydroxide powder is 7.5 nm.

Embodiment 3

[0023] Weigh 36.3 g of tetramethylammonium hydroxide dissolved in 100 mL of absolute ethanol and mix evenly, then add to a 250 ml three-neck flask, stir at 500 r / min, and control the temperature in a water bath to 50°C; weigh 51.1 g of hexahydrate Dissolve magnesium nitrate in 60 mL of absolute ethanol and mix evenly to make solution B, then slowly add solution B into the three-medium bottle, continue stirring for 1 hour after the dropwise addition, then sink for 2 hours at room temperature, and then filter with suction. Wash with 2000ml of water and 50ml of absolute ethanol, and dry the obtained filter cake in an oven at 110°C for 6 hours. The average particle size of the obtained nano-magnesium hydroxide powder is 6.7 nm.

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PUM

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Abstract

The invention relates to a preparation method of highly-dispersed nano-magnesium hydroxide. The preparation method comprises the following steps: dissolving tetramethylammonium hydroxide in anhydrous ethanol to prepare a 2.0-8.0mol / L solution A; preparing a soluble magnesium salt aqueous solution B; slowly adding the solution B into the solution A; and after the solution B is added and sunk under a room temperature condition, filtering, washing the filter cakes, and washing by anhydrous ethanol and drying to obtain a target product. The preparation method provided by the invention has the advantages of simple process and mild reaction condition, and can be used for synthesizing highly-dispersed nano-magnesium hydroxide which is uniform in size distribution.

Description

technical field [0001] The invention relates to a preparation method of highly dispersed nano magnesium hydroxide. Background technique [0002] The wide application of polymer materials such as plastics and rubber has brought great convenience to people's lives, but at the same time, the problem of flammability has also become a hot spot of concern, forcing the requirements for flame retardancy of these materials. Magnesium hydroxide is an environmentally friendly flame retardant that is developing rapidly at present. It has the advantages of good thermal stability, no toxic gas, and low price. After being added to plastic products, it has flame retardancy, smoke elimination, and anti-dripping. , filling and other functions, compared with similar inorganic flame retardants, it has better smoke suppression effect. As a functional powder material, nano-magnesium hydroxide has become one of the green environmental protection materials with great development prospects due to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14B82Y30/00
Inventor 张广良赵永红李国晋章胜超
Owner CHINA RES INST OF DAILY CHEM IND
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