Preparation method of magnesium oxide porous fiber

A technology of porous fiber and magnesium oxide, applied in the field of materials, can solve problems such as unprovable, impossible porous structure, unrecognizable porous structure, etc., and achieve the effect of single phase, simple raw material and high purity

Inactive Publication Date: 2013-07-17
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent 200510044630.X discloses a preparation method of porous magnesium oxide whiskers. The process uses a volatile raw material: ammonia water. The process needs to control the pH value. The process involves multiple high-temperature calcinations, with a maximum temperature of 1100°C. The final product is marked as porous whiskers. The whiskers are single crystals. A single whisker has a high integrity. It is impossible to have a porous structure on the whiskers. The micrographs provided cannot identify the porous structure. X-ray diffraction analysis The results also failed to prove that the product was a whisker

Method used

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  • Preparation method of magnesium oxide porous fiber
  • Preparation method of magnesium oxide porous fiber
  • Preparation method of magnesium oxide porous fiber

Examples

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Embodiment 1

[0025] The preparation method of magnesium oxide porous fiber, comprises the steps:

[0026] 1) Dissolve a certain amount of polyethylene glycol with a molecular weight of 6000 in deionized water, add an appropriate amount of MgSO 4 ·7H 2 O, stirred at room temperature, then slowly added dropwise an appropriate amount of precipitant NaOH solution while stirring to obtain a mixed solution; wherein, in molar ratio, MgSO 4 : PEG: NaOH=2:0.01:1, MgSO in the mixed solution 4 ·7H 2 The concentration of O is 1.5-2mol / L;

[0027] 2) Transfer the mixed solution to an autoclave lined with polytetrafluoroethylene, and the filling degree is 80%. Put the sealed reaction kettle in a box-type resistance furnace for hydrothermal treatment at a temperature of 150-160°C for 10 ~12 hours, then naturally cooled to room temperature, aged for 12~15 hours, filtered, washed, and dried at 80~100°C to obtain the precursor basic magnesium sulfate fiber.

[0028] 3) Put the precursor basic magnesium...

Embodiment 2

[0030] The preparation method of magnesium oxide porous fiber, comprises the steps:

[0031] 1) Dissolve a certain amount of polyethylene glycol with a molecular weight of 6000 in deionized water, add an appropriate amount of MgSO 4 ·7H 2 O, stirred at room temperature, then slowly added dropwise an appropriate amount of precipitant NaOH solution while stirring to obtain a mixed solution; wherein, in molar ratio, MgSO 4 : PEG: NaOH=1.85:0.01:0.85, MgSO in the mixed solution 4 ·7H 2 The concentration of O is 1.8mol / L;

[0032] 2) Transfer the mixed solution to an autoclave lined with polytetrafluoroethylene, and the filling degree is 80%. Put the sealed reaction kettle in a box-type resistance furnace for hydrothermal treatment at a temperature of 150-160°C for 10 ~12 hours, then naturally cooled to room temperature, aged for 12~15 hours, filtered, washed, and dried at 80~100°C to obtain the precursor basic magnesium sulfate fiber.

[0033] 3) Put the precursor basic magne...

Embodiment 3

[0035] The preparation method of magnesium oxide porous fiber, comprises the steps:

[0036] 1) Dissolve a certain amount of polyethylene glycol with a molecular weight of 6000 in deionized water, add an appropriate amount of MgSO 4 ·7H 2 O, stirred at room temperature, then slowly added dropwise an appropriate amount of precipitant NaOH solution while stirring to obtain a mixed solution; wherein, in molar ratio, MgSO 4 : PEG: NaOH=2.05:0.02:1.05, MgSO in the mixed solution4 ·7H 2 The concentration of O is 1.5mol / L;

[0037] 2) Transfer the mixed solution to a polytetrafluoroethylene-lined autoclave with a filling degree of 80%, and place the sealed reaction kettle in a box-type resistance furnace for hydrothermal treatment at a temperature of 150-160°C for 10 ~12 hours, then naturally cooled to room temperature, aged for 12~15 hours, filtered, washed, and dried at 80~100°C to obtain the precursor basic magnesium sulfate fiber.

[0038] 3) Put the precursor basic magnesium...

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Abstract

The invention discloses a preparation method of magnesium oxide porous fiber and relates to the material technology. The preparation method comprises the following steps of: (1), dissolving a certain amount of PEG (Polyethylene Glycol) with molecular weight of 6000 in deionized water, adding a proper amount of MgSO4.7H2O, stirring under room temperature, dropwise adding a proper amount of precipitant NaOH solution slowly while stirring to obtain a mixed solution, wherein the molar ratio of the MgSO4 to the PEG to the NaOH is x to y to z, wherein x is not smaller than 1.85 and not bigger than 2.05, y is not smaller than 0.01 and not bigger than 0.02 and z is not smaller than 0.85 and not bigger than 1.05; and the concentration of the MgSO4.7H2O in the mixed solution is 1.5mol / L-2mol / L; (2), carrying out hydro-thermal treatment on the mixed solution for 10-12 hours, naturally cooling the mixed solution to the room temperature, filtering and washing the mixed solution after aging the mixed solution for 12-15 hours, and drying the mixed solution at 80 DEG C to 100 DEG C to obtain precursor alkali magnesium oxide fiber. The magnesium oxide porous fiber obtained by the preparation method disclosed by the invention has a length of 100 microns to 200 microns, a slenderness ratio of 40-50, obvious porous structure characteristics and a bore diameter of 50nm-500nm.

Description

technical field [0001] The present invention relates to materials technology. Background technique [0002] Magnesium oxide whiskers are excellent reinforcing materials because of their good heat resistance (1600°C), insulation, alkali resistance, stability (melting point 2850°C) and reinforcement properties, making them widely used in the field of composite materials. application prospects. Porous magnesia fiber has a large specific surface area, a special skeleton structure and high catalytic activity, and can be used as an adsorbent, catalyst and carrier. At the same time, it has stable chemical and physical properties at high temperatures and does not interact with molten electrolyte salts (such as KCl- LiCl, LiCl-LiBr-KBr) reaction, and can be confined in the porous network and fiber grid, to prevent the flow of molten electrolyte salt, so it can be used for hot battery molten salt electrolyte binder. [0003] Chinese patent 200510044630.X discloses a preparation meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/12
Inventor 刘敬松张萍李惠琴游美容
Owner SOUTHWEAT UNIV OF SCI & TECH
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