Method for preparing magnesium oxide fiber via sol-gel method

A magnesia fiber, sol-gel technology, applied in the direction of inorganic raw material rayon and other directions, can solve the problems of complex production process and other problems, and achieve the effects of high purity, easy preparation and strong designability

Inactive Publication Date: 2014-02-05
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the preparation methods of magnesium oxide fibers mainly include slurry method, ICI method, direct oxidation deposition method, etc., but the production process is relatively complicated.

Method used

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  • Method for preparing magnesium oxide fiber via sol-gel method
  • Method for preparing magnesium oxide fiber via sol-gel method
  • Method for preparing magnesium oxide fiber via sol-gel method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Preparation of spinnable gel

[0023] After stirring and dispersing 1.2g of magnesium hydroxide in 50mL of deionized water, add 4.2g of citric acid, stir evenly, adjust to pH=5.0, and continue stirring overnight to obtain a transparent and stable solution. The solution is concentrated by rotary evaporation to obtain a transparent Spun gel.

[0024] b. Fiber preparation

[0025] After the above gel was made for 3 days, the filaments were picked with a glass rod to obtain gel filaments, dried in an oven at 100°C for 24 hours, and then calcined at 450°C to obtain magnesium oxide fibers.

Embodiment 2

[0027] a. Preparation of spinnable gel

[0028] After stirring and dispersing 1.2g of magnesium hydroxide in 80mL of ethanol aqueous solution, add 8.4g of citric acid, stir well, adjust to pH=4.0, and continue stirring overnight to obtain a transparent and stable solution. Concentrate the solution by rotary evaporation to obtain a transparent Spun gel.

[0029] b. Fiber preparation

[0030] After the above gel was left for 4 days, the filaments were picked with a glass rod to obtain gel filaments, dried in an oven at 100°C for 12 hours, and then calcined at 600°C to obtain magnesium oxide fibers.

Embodiment 3

[0032] a. Preparation of spinnable gel

[0033] After stirring and dispersing 2.4g of magnesium hydroxide in 120mL of acetone aqueous solution, add 8.4g of citric acid, stir evenly, adjust to pH=4.0, and continue stirring overnight to obtain a transparent and stable solution. Concentrate the solution by rotary evaporation to obtain a transparent Spinnable gel.

[0034] b. Fiber preparation

[0035] After the above gel was left for 7 days, the filaments were picked with a glass rod to obtain gel filaments, dried in an oven at 100°C for 8 hours, and then calcined at 600°C to obtain magnesium oxide fibers.

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Abstract

The invention discloses a method for preparing a magnesium oxide fiber via a sol-gel method. The method comprises the following steps: forming a stable sol-gel system under the complexing action between a magnesium ion and an organic ligand; and spinning and calcining the sol-gel system, thereby obtaining the magnesium oxide fiber. The method is simple to operate and low in cost. The obtained magnesium oxide fiber is smooth in surface and long in length diameter and has no significant defect, thereby having good application prospects and commercial values for fire-proof thermal insulation materials.

Description

technical field [0001] The invention relates to the technical field of fiber preparation, and specifically utilizes the complexation between magnesium ions and organic ligands to form a stable sol-gel system, and obtains magnesium oxide fibers after spinning and calcining. Background technique [0002] With the gradual development of human society and the continuous innovation of high-tech, the demand for new high-efficiency high-temperature-resistant and heat-insulating materials in military, aerospace and engineering fields is becoming more and more urgent. Due to their excellent chemical stability, structural stability and good mechanical properties, ceramic fibers can be divided into two categories: oxide ceramic fibers and non-oxide ceramic fibers. [0003] Non-oxide ceramic fibers have high thermal conductivity, low thermal expansion coefficient, high strength, and good creep resistance, but their high-temperature oxidation resistance is low, so they are not suitable f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08
Inventor 单永奎严莉丽邢芳朱小方刘玉飞占瑛
Owner EAST CHINA NORMAL UNIV
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