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Spherical alpha-alumina flame retardant and preparation method thereof

A technology of alumina and flame retardant, applied in the direction of alumina/hydroxide preparation, chemical instruments and methods, aluminum compounds, etc., can solve the problem of not being able to improve alumina particle size, shape, purity and cost at the same time High, uneven particle size and other problems, to achieve high electronic insulation, uniform particle size, and good homogenization effect

Active Publication Date: 2020-02-04
CHONGQING RES BETTER SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] However, most of the preparation methods at present, such as high-temperature solid-phase method (CN107032765A), sol-gel method (CN108863435A, CN106430266A), combustion method (CN107620026A), hydrothermal method ("Synthesis of Nano Al2O3 Modified Polyimide Film by Hydrothermal Method The preparation and characterization of ", CN105417562A, CN104477926A), the alkoxide method (CN102491392A) and other methods of alumina powder are mostly irregular in shape, or contain certain magnetic element impurities, or uneven particle size, or high cost. , cannot simultaneously improve the relationship between alumina particle size, morphology, purity and cost

Method used

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  • Spherical alpha-alumina flame retardant and preparation method thereof
  • Spherical alpha-alumina flame retardant and preparation method thereof
  • Spherical alpha-alumina flame retardant and preparation method thereof

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preparation example Construction

[0029] A typical embodiment of the present invention provides a method for preparing spherical a-alumina flame retardant. The preparation method includes:

[0030] Step (1), prepare a dispersant from deionized water, absolute ethanol, citric acid and tris, add alkali and aluminate to the above dispersant to form a mixed solution, and stir the mixed solution until it becomes a microemulsion State, the pH is 7-7.5. The proportions of the components in the dispersant are: 35ml deionized water, 2ml absolute ethanol, 10ml citric acid aqueous solution (concentration 0.1mol / ml), 10ml tris aqueous solution (concentration 0.1mol / ml) . Citric acid and Tris are mainly used as buffers and dispersants. The base is ammonium bicarbonate, ammonium bicarbonate. Easy to decompose. Good control during spray drying. Aluminate is one of aluminum nitrate or aluminum chloride, and the molar ratio of alkali to aluminate is 1:4. In the specific implementation, the alkali and aluminate are separate...

Embodiment 1

[0040] 1mol aluminum nitrate nonahydrate is made into a solution in 450ml deionized water and stirred at 600r / min; the obtained solution is spray-dried in a spraying equipment with nitrogen to obtain powder, and the drying is performed at an inlet temperature of 150°C and an outlet temperature of 80°C. The obtained powder is washed and dried. by figure 1 It can be seen that using aluminum nitrate as the aluminum source, the sample powder obtained by spray drying is spherical or nearly spherical. However, this preparation method is likely to cause equipment corrosion.

Embodiment 2

[0042] 1) Add 1 mol of aluminum nitrate nonahydrate and 4 mol of ammonium bicarbonate to 100ml of deionized water to make a solution, and use 350ml of deionized water, 20ml of ethanol, 10ml of citric acid aqueous solution (concentration of 0.1mol / ml), 10ml of Tris aqueous solution. (Concentration is 0.1mol / ml) In the prepared dispersant solution, use a centrifugal stirrer to stir the dispersant solution at 1000r / min. The pH of the complete reaction solution is 7-7.5;

[0043] 2) Take out 50ml of the mixed solution in step 1) and add 100ml of deionized water to dilute, and stir the diluted solution at 600r / min;

[0044] 3) The solution obtained in step 2) is spray-dried in a nitrogen spraying device to granulate to obtain powder; the drying is performed at an inlet temperature of 150°C and an outlet temperature of 80°C.

[0045] 4) The powder obtained in step 3) is cleaned with deionized water, filtered through filter paper, and dried at 60°C; cleaned at an ultrasonic frequency of 100...

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Abstract

The invention relates to a spherical alpha-alumina flame retardant and a preparation method thereof. The preparation method comprises the following steps: preparing a dispersant from deionized water,absolute ethyl alcohol, citric acid and tris(hydroxymethyl)aminomethane; adding an alkali and aluminate into the dispersant to form a mixed solution; carrying out reacting to obtain an ultrafine shortfibrous product; and performing spray-sintering to obtain the spherical alpha-alumina. The spherical alpha-alumina has the characteristics of uniform particle size, regular spherical appearance, no water content and high purity phase, has higher electronic insulation property, electrolyte corrosion resistance and thermal stability, and has sufficient electrochemical and chemical stability and good homogenization effect as a flame retardant.

Description

Technical field [0001] The invention relates to the technical field of preparation of a-alumina, in particular to a high-purity spherical a-alumina flame retardant with uniform particle size and a preparation method thereof. Background technique [0002] Since mankind became aware of energy and environmental issues, new clean energy has attracted much attention. Since the development of rechargeable batteries, lithium sodium ion batteries have gradually become mainstream products in the market. According to website market statistics such as lithium power grids, huge lithium batteries, and finance, lithium sodium ion batteries are mainly used in daily electronic equipment, new energy vehicles and large-scale Power plant. Among them, new energy vehicles have been listed as key development projects by the state. In the case of being widely used, lithium-sodium-ion battery problems have followed one after another, especially in the frequent occurrence of safety accidents of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30H01M2/16
CPCC01F7/308C01F7/302C01P2002/72C01P2004/03C01P2004/61C01P2004/32H01M50/431Y02E60/10
Inventor 龙震沈丽丽黄聪王军顺陈以檬胡章贵
Owner CHONGQING RES BETTER SCI & TECH
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