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A method for chemically preparing active micronano magnesium hydroxide flame retardant

A magnesium hydroxide, micro-nano technology, applied in magnesium hydroxide and other directions, can solve the problems of many by-products, complex processes, and many impurities, and achieve the effects of improving compatibility and dispersibility, and excellent quantum effect.

Active Publication Date: 2021-12-10
大连环球矿产股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to simple processing, many impurities, large and irregular particle size, the effect in the field of flame retardant is not good
There are many kinds of chemical preparation methods, most of which use alkaline substances as precipitants and magnesium salts as reaction raw materials to prepare magnesium oxide with different particle sizes through precipitation reactions. Due to complex processes, fine parameter control, and many by-products, Large-scale production is limited

Method used

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  • A method for chemically preparing active micronano magnesium hydroxide flame retardant
  • A method for chemically preparing active micronano magnesium hydroxide flame retardant

Examples

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Effect test

Embodiment 1

[0042] A method for chemically preparing active micro-nano magnesium hydroxide flame retardant, the method comprises the following steps:

[0043] take MgCO 3 The magnesite tailings with a content of 58% are used as raw materials. The raw materials are removed by primary manual beneficiation to remove impurities such as gangue, and the sorted raw materials are crushed into particles ranging from 10 to 20 mm. Water magnesium chloride is mixed evenly, heated at a rate of 5°C / min in a kiln, and calcined at 700°C for 1 hour to obtain active light-burned magnesium, which is sieved with 60 mesh to remove uncombined and decomposed CaCO 3 As well as impurities such as silicate, further purification;

[0044] Grind the active light-burned magnesium to 200 mesh, mix the active light-burned magnesium and water in a weight ratio of 1:2 in a stirring tank, and stir at 80 rpm for 1 h to obtain a magnesium hydroxide slurry;

[0045]Add ethylene glycol as a dispersant to the magnesium hydro...

Embodiment 2

[0049] A method for chemically preparing active micro-nano magnesium hydroxide flame retardant, the method comprises the following steps:

[0050] take MgCO 3 The magnesite tailings with a content of 68% are used as the raw material. The raw materials are subjected to primary manual beneficiation to remove impurities such as gangue, and the sorted raw materials are crushed into particles ranging from 10 to 20 mm. Water magnesium chloride is mixed, heated at a rate of 5°C / min in a kiln, and calcined at 650°C for 0.5h to obtain activated light-burned magnesium, which is sieved with 60 mesh to remove uncombined and decomposed CaCO 3 As well as impurities such as silicate, further purification;

[0051] Grind the active light-burned magnesium to 200 mesh, mix the active light-burned magnesium and water in a weight ratio of 1:2 in a stirring tank, and stir at 60 rpm for 2 hours to obtain a magnesium hydroxide slurry;

[0052] Add ethylene glycol as a dispersant to the magnesium h...

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Abstract

The invention relates to a method for chemically preparing an active micro-nano magnesium hydroxide flame retardant, which belongs to the fields of non-metallic mineral processing and preparation of environmentally friendly flame-retardant functional materials. The method of the present invention comprises the following steps: crushing magnesite tailings as a raw material, adding magnesium chloride hexahydrate, mixing, and calcining to obtain active light-burned magnesium; grinding active light-burned magnesium, and then mixing with water to obtain hydrogen Magnesium oxide slurry: adding ethylene glycol to the magnesium hydroxide slurry, adding modifier after grinding, and hydration reaction; drying and cleaving the hydrated magnesium hydroxide slurry to obtain active micronano magnesium hydroxide. The invention utilizes light-burned magnesium hydration reaction to prepare micronano magnesium hydroxide flame retardant, fully utilizes tailings resources, and conforms to the concept of sustainable development.

Description

technical field [0001] The invention relates to a method for chemically preparing active micro-nano magnesium hydroxide flame retardant, belonging to the fields of non-metallic mineral processing and environment-friendly flame retardant functional material preparation. Background technique [0002] Halogen-free, high-efficiency, smoke-eliminating, low-toxicity, and multi-functional environmentally friendly inorganic flame retardants are the mainstream direction of the development of new flame retardant materials. While effectively improving the flame retardancy of materials, they can reduce smoke and toxicity. The amount of gas released. Studies have shown that the carbonized polymer layer formed by magnesium hydroxide during the flame retardant process can effectively inhibit combustion; the decomposed product magnesium oxide is also a high-temperature resistant substance, and covering the surface of the polymer can greatly improve the efficiency of air isolation. to furth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/14C04B2/10C08K9/04C08K3/22
CPCC01F5/14C04B2/10C08K9/04C08K3/22C01P2004/03C01P2004/62C08K2003/2224C08K2201/011
Inventor 张延大张梦显
Owner 大连环球矿产股份有限公司
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