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Method for preparing ultrathin layered K2Ti4O9 crystal whiskers

A layered and whisker technology is applied in the field of stearic acid preparation of ultra-fine layered K2Ti4O9 whiskers to achieve the effects of high efficiency, reduced agglomeration and simple production equipment

Inactive Publication Date: 2015-04-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in view of the shortcomings and deficiencies of the prior art, to provide a kind of preparation with uniform size, less agglomeration, low roasting temperature, heat preservation Short time, relatively low cost K2Ti4O9 whisker method, and suitable for industrial mass production

Method used

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  • Method for preparing ultrathin layered K2Ti4O9 crystal whiskers
  • Method for preparing ultrathin layered K2Ti4O9 crystal whiskers
  • Method for preparing ultrathin layered K2Ti4O9 crystal whiskers

Examples

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Effect test

Embodiment 1

[0031] Heat and melt 30g of stearic acid at 80°C, after it is completely melted, press Ti(OC 2 h 5 ) 4 / KNO 3 Add the initial material at a molar ratio of 2:2, that is, add 2mol / L KNO while hot while stirring 3 10ml of aqueous solution, the dropping rate is 45 drops / min; at the same time, add 6.8g of ethyl titanate to the above system, continue to stir for 50min after dropping, and get KNO 3 -Ti(OC 2 h 5 ) 4 Gel; burn off most of the organic matter in the above gel in an electric furnace at 550°C to obtain K 2 Ti 4 o 9 Precursor; after cooling, ball mill for 30 minutes, then heat up to 850°C at a heating rate of 7°C / min and calcined for 3 hours, and the layered K 2 Ti 4 o 9 whiskers.

Embodiment 2

[0033] Heat and melt 35g of stearic acid at 80°C, after it is completely melted, press Ti(OC 2 h 5 ) 4 / KNO 3 Add the initial material at a molar ratio of 2:2, that is, add 2mol / L KNO while hot while stirring 3 10ml of aqueous solution, the dropping rate is 40 drops / min; at the same time, add 6.8g of ethyl titanate to the above system, continue to stir for 40min after dropping, and get KNO 3 -Ti(OC 2 h 5 ) 4 Gel; burn most of the organic matter in the above gel in an electric furnace at 600°C to obtain K 2 Ti 4 o 9 Precursor; after cooling, ball mill for 30 minutes, then heat up to 800°C at a heating rate of 5°C / min and calcined for 5 hours, and the layered K 2 Ti 4 o 9 whiskers.

Embodiment 3

[0035] Heat and melt 35g of stearic acid at 90°C, after it is completely melted, press Ti(OC 2 h 5 ) 4 / KNO 3 Add the initial material at a molar ratio of 2:2, that is, drop in 2mol / L of KNO while hot while stirring 3 Aqueous solution 10ml, the rate of addition is 35 drops / min; at the same time, add 6.8g of ethyl titanate to the above system, continue to stir for 30min after dropping, and get KNO 3 -Ti(OC 2 h 5 ) 4 Gel; burn most of the organic matter in the above gel in an electric furnace at 600°C to obtain K 2 Ti 4 o 9 Precursor. After cooling, ball mill for 30 minutes, then heat up to 950°C for 2 hours at a heating rate of 5°C / min, and then calcine for 2 hours. After cooling in the furnace, the layered K 2 Ti 4 o 9 whiskers.

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Abstract

The invention discloses a method for preparing ultrathin layered potassium tetratitanate crystal whiskers with uniform sizes, good crystal forms and attractive appearances by adopting a stearic acid method. The crystal whiskers are 0.8-1.2 mum in diameter; length-diameter ratio exceeds 20; and main raw materials include stearic acid, potassium nitrate and tetraethyl titanate. The method comprises the following steps of: melting reactants into stearic acid by taking stearic acid with low melting point (80 DEG C) and poor dispersibility as a reaction medium; and burning for removing most organic matters; performing a synthetic method for calcining at a high temperature, wherein the stearic acid is taken as a dispersing agent for mixing reactant raw materials on the molecular level in a synthesizing process, and is also taken as a reactant for being subjected to a coordination reaction with K<+> and Ti<4+> in the reactant raw materials. The method has the characteristics of simple operation process, low calcining temperature (800-950 DEG C), short reacting time (2-5 hours), high purity, high crystalizing degree, low product aggregation and the like, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of inorganic fiber materials, in particular to an ultrafine layered K 2 Ti 4 o 9 Preparation method of stearic acid for whiskers. Background technique [0002] Potassium tetratitanate (K 2 Ti 4 o 9 ) is a layered inorganic material with certain chemical activity and excellent ion exchange performance. Its crystal structure is based on TiO 6 The octahedron is a stable chain and open layered structure connected by common edges and common corners, and the interlayer K + Can be exchanged by other ions, the exchanged K + The quantity is different, the composition, structure and performance of the product are different. Therefore, K 2 Ti 4 o 9 It can be used as a cation adsorption and exchange material, as a precursor for the synthesis of barium titanate or strontium titanate fibers, as an ion exchanger for wastewater treatment, and as a host material for embedding inorganic compounds. In addition, using its s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B1/10C30B29/62C30B29/32
Inventor 吉晓莉吴事江王浩陈卓翟成成王先海
Owner WUHAN UNIV OF TECH
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