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Method for preparing plate-like basic magnesium carbonate by template-induced/homogeneous precipitation

A homogeneous precipitation and magnesium carbonate technology, which is applied in the field of fire protection and materials, can solve the problems of complicated preparation methods, restrictions on the application of basic magnesium carbonate, agglomeration, etc., and achieve the effects of reducing safety hazards, good flame retardancy, and improving performance

Inactive Publication Date: 2018-06-26
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the crystal forms of basic magnesium carbonate used for flame retardancy are petal-shaped, spherical, etc., but the preparation method is relatively complicated, and agglomeration phenomenon will inevitably occur, and its shape greatly limits the application of basic magnesium carbonate

Method used

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  • Method for preparing plate-like basic magnesium carbonate by template-induced/homogeneous precipitation
  • Method for preparing plate-like basic magnesium carbonate by template-induced/homogeneous precipitation
  • Method for preparing plate-like basic magnesium carbonate by template-induced/homogeneous precipitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Weigh 2.0714g of MgCl 2 ·6H 2 O (purity: 98%) was dissolved in 25 ml of distilled water, and 0.5 mol / L dilute hydrochloric acid was added dropwise until pH=3.

[0024] 2. Weigh 1.212g of urea (purity: 99%) and 0.2071g of tetrahydrofuran, and dissolve them in the above solution.

[0025] 3. Transfer the solution obtained above to the reaction kettle, and pour a small amount of distilled water after rinsing the beaker into the reaction kettle.

[0026] 4. After sealing the reaction kettle, put it into a constant temperature water bath at 100°C, react for 8 hours, age for 5 hours, vacuum filter, and dry at 90°C for 4 hours to obtain plate-shaped basic magnesium carbonate.

[0027] Plate-shaped Mg prepared under the above conditions 5 (CO 3 ) 4 (OH) 2 4H 2 The XRD diffraction pattern of O is shown in figure 1 . By comparing with the standard PDF card, the peak position and relative signal intensity of the sample are basically consistent with the standard diffrac...

Embodiment 2

[0029] 1. Weigh 3.6250g of MgCl 2 ·6H 2 O (purity is 98%), add 25ml of distilled water to dissolve, add 0.5mol / L dilute hydrochloric acid drop by drop until pH=3;

[0030] 2. Weigh 3.1818g urea (99% purity) and 0.3625g dimethyl sulfoxide, and dissolve them in the above solution;

[0031] 3. Transfer the solution obtained above to the reactor, and pour a small amount of distilled water after rinsing the beaker into the reactor;

[0032] 4. After sealing the reaction kettle, put it into a constant temperature water bath at 100°C, react for 16 hours, age for 5 hours, vacuum filter, and dry at 90°C for 4 hours to obtain plate-shaped basic magnesium carbonate.

[0033] The Mg obtained in Example 2 5 (CO 3 ) 4 (OH) 2 4H 2 SEM photo of O ( image 3 a) with figure 2 There are obvious differences, but the photos under high magnification ( image 3 b) It can be seen from observation that the crystal is formed by stacking multi-layer sheets. The reason for this result is larg...

Embodiment 3

[0035] 1. Weigh 5.1786g of MgCl 2 ·6H 2 O (purity is 98%), add 25ml of distilled water to dissolve, add 0.5mol / L dilute hydrochloric acid drop by drop until pH=3;

[0036] 2. Weigh 6.0606g of urea (99% purity) and 0.5179g of ethylenediaminetetraacetic acid, and dissolve them in the above solution;

[0037] 3. Transfer the solution obtained above to the reactor, and pour a small amount of distilled water after rinsing the beaker into the reactor;

[0038] 4. After the reaction kettle is sealed, put it into a constant temperature water bath at 100°C, react for 24 hours, age for 5 hours, vacuum filter, and dry at 90°C for 4 hours to obtain plate-shaped basic magnesium carbonate.

[0039] from Figure 4 As can be seen from the shown SEM photographs, the flaky basic magnesium carbonate prepared under the conditions of Example 3, as time increases, the crystal growth is more complete, and the smoothness of the crystal plane is enhanced.

[0040] It can be seen from the above exa...

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Abstract

The invention relates to a method for preparing plate-like basic magnesium carbonate by a template induction / homogeneous precipitation method, wherein the method includes the following steps: (1) preparing a solution with a certain concentration from magnesium chloride hexahydrate, adding dilute hydrochloric acid drop by drop to pH of 3, and adding urea and a template agent; and transferring the mixed solution to a reaction kettle, carrying out a reaction, and aging; (2) carrying out suction filtration of the obtained mixed solution; and (3) drying a precipitate, to obtain the plate-like basic magnesium carbonate. The method has the beneficial effects that: 1, the crystal diameter extremely easily reaches as small as the nano or submicron level; and 2, high polymer products containing the plate-like filler are produced. No matter the production of a flame retardant agent or production of a multifunctional polymer material, great economic benefits are brought. Moreover, after being put into use, the plate-like basic magnesium carbonate has good flame retardancy and high temperature resistance, and greatly reduces potential safety hazards of generation of fire disaster.

Description

technical field [0001] The invention belongs to the technical field of materials and fire protection, and in particular relates to a method for preparing plate-shaped basic magnesium carbonate by a template induction / homogeneous precipitation method. Background technique [0002] Polymer materials have been widely used in transportation, construction, electrical and electronics and other fields, and play a huge role in the construction of the national economy. However, the vast majority of polymers are flammable. They generate large amounts of heat and high temperature during combustion. The black smoke generated by incomplete combustion and the toxic and corrosive gases released bring great harm to firefighting and lifesaving work. difficulty. The flame retardant technology of polymers, the most direct way at present is to add flame retardants. [0003] Basic magnesium carbonate is thermally decomposed and resistant to high temperature, thermally decomposed to generate Mg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/24B82Y30/00
CPCC01F5/24C01P2002/72C01P2004/03C01P2004/64
Inventor 黄志良陈娟李文昭徐伟荣
Owner WUHAN INSTITUTE OF TECHNOLOGY
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