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Preparation method of potassium octatitanate whisker

A technology of potassium octatitanate and whiskers, which is applied in the field of preparation of potassium octatitanate whiskers synthesized by molten salt method, achieving the effects of high purity, improved dispersibility, and reduced cost

Inactive Publication Date: 2015-09-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the molten salt method has been used to synthesize alkali metal titanate materials such as potassium hexatitanate, barium titanate and sodium titanate, but there is no relevant report on the preparation of potassium octatitanate whiskers by the molten salt method so far.

Method used

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  • Preparation method of potassium octatitanate whisker
  • Preparation method of potassium octatitanate whisker
  • Preparation method of potassium octatitanate whisker

Examples

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preparation example Construction

[0029] The preparation of potassium octatitanate whiskers of the present invention can be realized in the following specific ways:

[0030] 1) Preparation of raw materials: Weigh the solid-phase titanium source and potassium source with a certain molar mass ratio, mix them with a sufficient amount of KCl molten salt medium, add an appropriate amount of absolute ethanol, disperse evenly, grind for 30 minutes, and place them in corundum after fully drying in the crucible.

[0031] 2) Calcination treatment: put the corundum crucible containing the mixture into a stainless steel reactor. Afterwards, the reactor is put into an electric furnace, calcined at a temperature of 780° C. to 900° C. for 2 to 4 hours, and then naturally cooled to room temperature.

[0032] 3) Removing the medium: dissolving the reaction product with deionized water (40-50° C.), filtering and washing with suction to separate the solid and liquid, and remove KCl in the product.

[0033] 4) Drying: Dry the s...

Embodiment 1

[0049] 1) Preparation of raw materials: put 1.60g of rutile titanium dioxide powder (50-60nm, AR), 0.53g of potassium carbonate (AR), and 23.60g of potassium chloride (AR) into an agate mortar filled with 20ml of absolute ethanol , mixed and ground for 30 minutes, and fully dried; 2) Calcination treatment: transfer the prepared raw materials to a corundum crucible, and then put them into a stainless steel reactor in an electric furnace (such as figure 1 ), start calcining: the first stage of heating, the heating rate is controlled at 5°C / min; the second stage of heat preservation, the temperature is controlled at 800°C, and the heat preservation time is 4 hours; the third stage of cooling, natural cooling to room temperature out of the furnace; 3) remove Medium: Put the heat-treated product into a sufficient amount of deionized water (40-50°C), the molten salt medium (KCl) will be continuously dissolved and a water-insoluble reaction product precipitate (that is, potassium oct...

Embodiment 2

[0052] 1) Preparation of raw materials: put 1.6g of rutile titanium dioxide powder (50-60nm, AR), 0.75g of potassium acetate (AR), and 23.60g of potassium chloride (AR) into an agate mortar filled with 20ml of absolute ethanol , mixed and ground for 30 minutes, and fully dried; 2) Calcination treatment: transfer the prepared raw materials to a corundum crucible, then put them into a stainless steel reactor in an electric furnace, and start calcination: the first stage of heating, the heating rate is controlled at 5 ° C / min; the second stage of heat preservation, the temperature is controlled at 800 ° C, and the heat preservation time is 4 hours; the third stage of cooling, naturally cooled to room temperature; 3) removal of medium: put the heat-treated product into a sufficient amount of deionized water (40 ~50°C), the molten salt medium (KCl) is continuously dissolved and a water-insoluble reaction product precipitate (that is, potassium octatitanate whiskers) is obtained, a...

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Abstract

A preparation method of potassium octatitanate whisker adopts KCl as a reaction medium, and comprises the following steps: 1, preparing a raw material: uniformly dispersing a titanium source and a potassium source which are used reactants, and the reaction medium in a lower alcohol solvent, and fully drying; 2, calcining: calcining a dried material obtained in step 1; 3, removing the reaction medium: washing a calcined material obtained in step 2 by using water until no Cl<-> ions are washed out; and 4, drying: drying a solid product obtained in step 3 to obtain the purified potassium octatitanate whisker. The above whole production process is green and pollution-free. The potassium octatitanate whisker has the advantages of good purity, good degree of crystallization, uniform size and good dispersibility.

Description

technical field [0001] The invention relates to a preparation process for alkali metal titanate whiskers, which belongs to the field of materials, and in particular to a preparation process for synthesizing potassium octatitanate whiskers by a molten salt method. Background technique [0002] Potassium titanate whiskers were originally researched and developed by DuPont Company of the United States in 1958. They are a class of whiskers with the chemical formula K 2 Ti n o 2n+l (wherein n=1, 2, 4, 6, 8) novel inorganic functional fibers are often used as reinforcing agents for high-performance composite materials. Different whiskers have different crystal structures, so their physical and chemical properties are significantly different, among which potassium octatitanate (K 2 Ti 8 o 17 ) The whisker structure is based on TiO 6 A chain tunnel-like structure of octahedrons connected by coplanar and common edges, K + Occupy the middle of the tunnel. This unique crystal s...

Claims

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Application Information

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IPC IPC(8): C30B9/00C30B29/62C30B29/32
Inventor 李冰王强郭卿君
Owner EAST CHINA UNIV OF SCI & TECH
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