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Method for preparing hexagonal flaky magnesium hydroxide for flame retardants by using large-grain-size magnesium hydroxide hydrothermal method

A technology of magnesium hydroxide and hexagonal flakes, applied in the direction of magnesium hydroxide, etc., to achieve good economic benefits, large application value and market value, and simple process flow

Active Publication Date: 2020-01-03
WESTERN MINING GROUP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a hexagonal sheet for the preparation of flame retardants by the hydrothermal method of large particle size magnesium hydroxide with simpler process flow, lower production cost and environment-friendly characteristics. The method of magnesium hydroxide, which solves the problem of high cost and strong corrosion of magnesium hydroxide dissolution-recrystallization additives while realizing the preparation of flame-retardant grades with magnesium hydroxide and without increasing impurity ions

Method used

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  • Method for preparing hexagonal flaky magnesium hydroxide for flame retardants by using large-grain-size magnesium hydroxide hydrothermal method
  • Method for preparing hexagonal flaky magnesium hydroxide for flame retardants by using large-grain-size magnesium hydroxide hydrothermal method
  • Method for preparing hexagonal flaky magnesium hydroxide for flame retardants by using large-grain-size magnesium hydroxide hydrothermal method

Examples

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Effect test

Embodiment 1

[0020] Example 1. 1. Preparation of reaction raw materials: Weigh 80g of large particle size magnesium hydroxide (with a particle size of 40-60μm), weigh 81.32g of bischofite, measure 1520mL of distilled water, and add to 2L In the high temperature and high pressure reactor device.

[0021] 2. Preparation of Magnesium Hydroxide for Flame Retardant Grade: Seal the high temperature and high pressure reactor device with raw materials, adjust the temperature to 160℃, and adjust the speed to 500r / min. When ready, start the high temperature and high pressure reactor device at 160℃ , And react for 6h at 500r / min. The product is filtered, washed 5 times, and dried to obtain a flame-retardant grade hexagonal flake magnesium hydroxide. The calculated magnesium hydroxide I 001 / I 101 And I 001 / I 110 The polarity ratios are 1.57 and 3.81 respectively. X-ray diffraction experiments have confirmed that it is magnesium hydroxide with extremely low polarity. Scanning electron microscopy shows ...

Embodiment 2

[0022] Example 2: Preparation of reaction raw materials: weigh 75g of large particle size magnesium hydroxide (particle size 40-60μm), weigh 77g of bischofite, measure 1440mL of distilled water, and add it to 2L of high temperature and high pressure reaction In the kettle device. The other processes are the same as in Example 1.

Embodiment 3

[0023] Example 3 Preparation of reaction raw materials: Weigh 85g of large particle size magnesium hydroxide (particle size 40-60μm), weigh 86g of bischofite, measure 1600mL of distilled water, and add it to 2L of high temperature and high pressure reaction In the kettle device, other processes are the same as in Example 1.

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Abstract

The invention discloses a method for preparing hexagonal flaky magnesium hydroxide for flame retardants by using a large-grain-size magnesium hydroxide hydrothermal method. The method comprises the following steps: weighing large-grain-size magnesium hydroxide and bischofite, transferring the large-grain-size magnesium hydroxide and bischofite into a high-temperature high-pressure reaction kettle,adding distilled water, and carrying out stirring for performing hydrothermal treatment, so that the large-grain-size magnesium hydroxide is fully dissolved and recrystallized; and filtering the product obtained by a reaction, and carrying out washing and drying to obtain the magnesium hydroxide for flame retardants. According to the invention, the large-grain-size magnesium hydroxide is used asa raw material, and the bischofite is used as an additive; the process flow is simple, and production cost is low; the problem that magnesium hydroxide is difficult to dissolve is solved under a condition that no alkaline additives (sodium hydroxide, potassium hydroxide and the like) is used; and the magnesium hydroxide for flame retardants is prepared with low cost and high efficiency. The hexagonal flaky magnesium hydroxide prepared by the method has the advantages of high purity, narrow particle size distribution, small particle size (D50=1.86 microns and D90=4.20 microns) and hexagonal flaky shape, and has a great application value and market value.

Description

Technical field [0001] The invention relates to the technical field of preparation of hexagonal flake magnesium hydroxide for flame-retardant grades, in particular to a method for preparing magnesium hydroxide for flame-retardant grades by using large-diameter magnesium hydroxide as a raw material and adopting a hydrothermal method. Background technique [0002] Magnesium hydroxide product is an important magnesium inorganic material. It has excellent physical and chemical properties such as non-toxic, non-polluting, high temperature resistance, and corrosion resistance. It is widely used for the treatment of antibacterial, waste water, waste gas and acidic water pollutants, papermaking Industrial fillers, electronic and optical devices, precursors for the production of magnesium oxide, and a new generation of flame retardants. The particle size, particle size distribution, microscopic morphology and other characteristics of magnesium hydroxide have a decisive influence on its di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14
CPCC01F5/14C01P2002/72C01P2004/03C01P2004/61
Inventor 罗仙平宋学文曹雨微梁健唐学昆
Owner WESTERN MINING GROUP
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