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Chemical method for preparing active micro-nano-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, large-scale production limitations, complex processes, etc., to improve compatibility and dispersibility, easy parameter control, and excellent quantum effect. Effect

Active Publication Date: 2019-10-18
大连环球矿产股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Chemical method for preparing active micro-nano-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 chemical method for preparing an active micro-nano-magnesium hydroxide flame retardant, and belongs to the field of non-metallic mineral processing and environment-friendlyflame retardant functional material preparation. The chemical method for preparing the active micro-nano-magnesium hydroxide flame retardant comprises the following steps that magnesite gangue is usedas a raw material for being crushed, and then magnesium chloride hexahydrate is added for blending and calcinating to obtain active caustic calcined magnesite; the active caustic calcined magnesite is ground and then blended with water to obtain a magnesium hydrate grout; ethylene glycol is added into the magnesium hydrate grout, a modifying agent is added after grinding is carried out, and hydration reaction is carried out; and the magnesium hydrate grout is dried and split after hydration to obtain active micro-nano-magnesium hydroxide. According to the chemical method for preparing the active micro-nano-magnesium hydroxide flame retardant, the caustic calcined magnesite hydration reaction is used for preparing the micro-nano-magnesium hydroxide flame retardant, gangue resources are fully used, and an idea of sustainable development is conformed.

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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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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