Low-temperature molten salt thermal inversion preparation method of aporate-crystal antifungin whiskers

A technology of magnesium borate whiskers and low-temperature molten salt, applied in the directions of borates, chemical instruments and methods, boron oxide compounds, etc., can solve the problems of uneven morphology, product agglomeration, and high temperature, and achieve uniform morphology and dispersion. Good, good crystallizing effect

Inactive Publication Date: 2008-11-26
TSINGHUA UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-temperature molten salt heating method for preparing non-porous and highly crystalline magnesium borate whiskers for the problems of high temperature, high energy consumption, uneven appearance, product agglomeration and porosity in the traditional preparation process of magnesium borate whiskers. transform new method

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  • Low-temperature molten salt thermal inversion preparation method of aporate-crystal antifungin whiskers
  • Low-temperature molten salt thermal inversion preparation method of aporate-crystal antifungin whiskers
  • Low-temperature molten salt thermal inversion preparation method of aporate-crystal antifungin whiskers

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preparation example Construction

[0017] The invention provides a low-temperature molten salt thermal conversion preparation method for non-porous high-crystalline magnesium borate whiskers. The hydrothermal product basic magnesium borate whiskers is used as a precursor, mixed with a trace amount of inorganic molten salt, and heated in an air atmosphere at 600-750°C. Medium roasting, control the pyrolysis dehydration rate of the precursor by adjusting the heating rate, and at the same time use the small size effect or double salt effect of the nano-flux particles deposited on the surface of the basic magnesium borate whiskers to reduce the melting point of the system, and use the flux seepage to achieve structural reformation and eliminate pores, and then wash, filter, and dry to obtain non-porous, highly crystalline magnesium borate whiskers with regular morphology and good dispersion. The specific steps are as follows:

[0018] 1) prepare 0.5~15wt% molten salt solution, molten salt adopts any one in sodium ch...

Embodiment 2

[0028] Weigh 2.0 grams of hydrothermal product basic magnesium borate whiskers, weigh 0.02 grams of sodium chloride according to its mass ratio of 1%, and dissolve sodium chloride in 4 milliliters of deionized water to prepare a 0.5 wt % sodium chloride solution. Mix basic magnesium borate whiskers and sodium chloride solution, place in a corundum crucible and an air roaster, heat up (10°C / min) to 750°C, and then treat at a constant temperature for 1 hour, then wash, filter, and dry at 100°C for 18 hours , the average length is 0.5μm, the average diameter is 50nm, the aspect ratio is 10, and the specific surface area is 30.5m 2 / g, non-porous high crystalline magnesium borate whiskers with a main content of 98%.

Embodiment 3

[0030] Weigh 2.0 grams of hydrothermal product basic magnesium borate whiskers, weigh 0.6 grams of potassium chloride according to its mass ratio of 30%, and dissolve potassium chloride in 4 milliliters of deionized water to prepare a 15 wt % potassium chloride solution. Mix basic magnesium borate whiskers and potassium chloride solution, place in a corundum crucible and an air roaster, heat up (1°C / min) to 600°C, then treat at a constant temperature for 5 hours, then wash, filter, and dry at 95°C for 20 Hours, the average length is 20μm, the average diameter is 100nm, the aspect ratio is 200, and the specific surface area is 20.8m 2 / g, non-porous high crystalline magnesium borate whiskers with a main content of 98.5%.

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Abstract

The invention discloses a method for preparing a low temperature fused salt of an aporate high crystallization magnesium borate crystal whisker by means of a thermal transition, which belongs to the field of inorganic chemical engineering technology. A hydrothermal product alkali magnesium borate crystal whisker is used by the method as a precursor, roasted for 1-5 hours in an air atmosphere of 600-750<DEG C> with an assistance of minim inorganic fused salt, washed, filtered, and dried, thus obtaining the aporate high crystallization magnesium borate crystal whisker with a length of 0.5-20mum, a diameter of 10-100nm, a slenderness ratio of 10-200, and the main content of the aporate high crystallization magnesium borate crystal whisker is bigger than 98 percent. The method has the advantages that raw materials of the invention are cheap and easy to get; the craftwork is simple; the condition is mild; added value of the product is high; an industrialized popularization is easy; the feature of the prepared magnesium borate crystal whisker is regular; the dispersion is good, no holes exists; the crystallization degree is high; an application to industries of magnesium/aluminium alloy, plastics, rubber, and pottery, and the like, as reinforcing material is hopeful.

Description

technical field [0001] The invention relates to a new process for preparing non-porous high-crystal magnesium borate whiskers by thermal transformation of low-temperature molten salt, which belongs to the technical field of inorganic chemical industry. Background technique [0002] my country is a country rich in magnesium and boron resources, with rich reserves in Qinghai, Liaoning and other places, but most of them are in the primary utilization stage at present, mainly based on traditional primary products such as magnesium chloride, magnesium sulfate, magnesium carbonate, magnesium oxide, magnesium hydroxide, boric acid, and borax. Low technical content and low added value. Utilizing abundant magnesium and boron resources to prepare high-performance and high-value-added functional materials is becoming a top priority ~32; Liu Ran, Xue Xiangxin, Liu Xin, etc., Progress in the processing technology of boron resources and application of boron materials in my country, Silicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B29/62C01B35/12
Inventor 向兰朱万诚朱慎林
Owner TSINGHUA UNIV
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