Micro-nano basic magnesium carbonate flame retardant and preparation method thereof

A magnesium carbonate, micro-nano technology, applied in the field of nanomaterials, can solve the problems of measurement of flame retardant effect without flame retardant, no green environmental protection characteristics, no green environmental protection and other problems, achieve good smoke suppression effect, reduce heat transfer effect, Excellent flame retardant effect

Active Publication Date: 2019-03-08
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent CN102583457A introduces a method for synthesizing a nano needle-shaped magnesium hydroxide flame retardant, using bischofite, slaked lime, and calcium chloride dihydrate as raw materials, polyethylene glycol and sodium lauryl sulfate as dispersants, through Ball mill ball milling is obtained by heat treatment. This method has cumbersome steps and introduces more organic solvents. It is not environmentally friendly, and the patent does not specifically measure the flame retardant effect of flame retardants.
[0005] Patent CN106673027A introduces a preparation method of hexagonal flaky magnesium hydroxide flame retardant, which is prepared by hydrothermal reaction with magnesium salt solution, structure-directing agent, inorganic alkali solution and absolute ethanol as raw materials. This method uses Most of the structure-directing agents are organic substances such as organic bases or surfactants. The preparation process is accompanied by the generation of organic waste liquid, which does not have environmental protection characteristics, and the patent does not specifically measure the flame-retardant effect of flame retardants.

Method used

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  • Micro-nano basic magnesium carbonate flame retardant and preparation method thereof
  • Micro-nano basic magnesium carbonate flame retardant and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of this flame retardant is as follows:

[0027] Prepare 200mL of aqueous sodium carbonate solution (0.1mol / L) and 200mL of magnesium chloride hexahydrate solution (0.1mol / L) respectively, and add the aqueous sodium carbonate solution dropwise at a rate of 50mL / min to the magnesium chloride hexahydrate solution stirred at a constant speed of 1000rpm ; After the addition is completed, put the mixed solution in an oven at 90°C for aging for 5 hours; after the aging is completed, filter out the precipitate, wash and dry at 30°C for 60 minutes; Fuel.

[0028] The nano basic magnesium carbonate flame retardant was imaged by scanning electron microscopy, and the results were as follows figure 1 As shown, the nanoparticles have a spherical structure, stacked by multi-layer nanosheets, similar to flower petals, and the particle size distribution is uniform, and the size of the nanoparticles is between 30 and 50 μm, and the shape stability is good. The X...

Embodiment 2

[0032] The preparation method of this flame retardant is as follows:

[0033] Prepare 200mL of aqueous sodium carbonate solution (0.1mol / L) and 200mL of magnesium chloride hexahydrate solution (0.1mol / L) respectively, and add the aqueous sodium carbonate solution dropwise at a rate of 1mL / min to the magnesium chloride hexahydrate solution stirred at a constant speed of 1000rpm After the addition is completed, the mixture is aged in an oven at 50°C for 5 hours; after the aging is completed, the precipitate is filtered out, washed and dried at 100°C for 60 minutes; after drying, the petal-shaped micro-nano basic magnesium carbonate barrier is obtained. Fuel.

[0034] The flame retardant effect test of this flame retardant is as follows:

[0035] Basic magnesium carbonate was spun into a film with a width of 15 mm and a thickness of 0.1 mm in the electrospinning solution doped with 5 wt % of cellulose acetate, and the combustion rate of the composite film was measured to be 498....

Embodiment 3

[0037] The preparation method of this flame retardant is as follows:

[0038]Prepare 200mL of aqueous sodium carbonate solution (1.5mol / L) and 200mL of magnesium chloride hexahydrate solution (1.5mol / L) respectively, and add the aqueous sodium carbonate solution dropwise at a rate of 1mL / min to the magnesium chloride hexahydrate solution stirred at a constant speed of 1000rpm ;After the addition is completed, put the mixed solution in a 50°C oven to mature for 0.5h; after the aging is completed, filter out the precipitate, wash and dry at 30°C for 60min; after drying, you can get petal-shaped micro-nano basic magnesium carbonate flame retardant.

[0039] The flame retardant effect test of this flame retardant is as follows:

[0040] Basic magnesium carbonate is spun into a film with a width of 15 mm and a thickness of 0.1 mm in the electrospinning solution doped with 5 wt % of cellulose acetate, and the horizontal and vertical combustion method measures the burning rate of th...

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Abstract

The invention provides a micro-nano basic magnesium carbonate flame retardant and a preparation method thereof. The preparation method comprises the following steps: firstly, dropwise adding a solublecarbonate aqueous solution with the concentration of 0.1 to 1.5 mol / L into a uniformly-stirred magnesium chloride hexahydrate aqueous solution with the concentration of 0.1 to 1.5 mol / L at the speedof 1 to 50 mL / min; secondly, putting a mixed solution obtained in the first step into a baking oven for curing at the curing temperature of 50 to 90 DEG C for 0.5 to 5 hours; thirdly, further filtering the mixed solution obtained in the second step, washing and drying at the temperature of 30 to 100 DEG C for 30 to 60 minutes, thus obtaining the basic magnesium carbonate flame retardant with a chemical formula of Mg5(CO3)4(OH)2.4H2O. The micro-nano basic magnesium carbonate flame retardant provided by the invention has excellent flame-retardant effect and good smoke suppression effect; a preparation process does not need to use an organic solvent, so that greenness and environment friendliness are realized.

Description

technical field [0001] The present invention relates to the field of nanomaterials, more specifically to a kind of micronano basic magnesium carbonate flame retardant and preparation method thereof. Background technique [0002] With the development of modern industry, the application scale of high molecular polymers is constantly expanding. Most of these substances are flammable, which leads to increasingly prominent fire hazards. In recent years, large-scale fire incidents have occurred frequently, and most of the fatal causes of fire It is the excessive smoke that causes suffocation. Part of the cause of the accident was that the molten metal from the welding spatter ignited a large number of flammable fragments of polyurethane insulation material accumulated below, which caused the fire. Therefore, the containment of the fire is imminent. Starting from raw materials, the method to contain combustion is mainly to add appropriate flame retardants, thereby improving the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24C09K21/02C08K3/26C08K7/00B82Y40/00
CPCB82Y40/00C01F5/24C01P2004/32C01P2004/45C01P2004/61C08K3/26C08K7/00C09K21/02
Inventor 邓波姜浪李可刘欣夏治刚李文斌徐卫林
Owner WUHAN TEXTILE UNIV
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