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Preparation method of super-long potassium tetratitanate whisker

A technology of potassium tetratitanate and whiskers, which is applied in the field of preparation of ultra-long potassium tetratitanate whiskers, can solve the problems of complex process, high cost, and difficulty in large-scale production, and achieve simple operation, low cost, and short production cycle short effect

Active Publication Date: 2021-12-21
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN 108620053A and Chinese patent application CN106800308A adopt the hydrothermal method to prepare potassium titanate whiskers. The main process is to prepare potassium titanate whiskers by hydrothermally reacting titanium-containing raw materials and potassium-containing raw materials. Industrial production
[0004] Chinese patent CN 103060948 A uses a sol-gel method to prepare potassium tetratitanate whiskers. The main process is to prepare a sol solution from titanium-containing raw materials, potassium-containing raw materials and other raw materials, and obtain potassium tetratitanate whiskers by heat treatment by electrospinning. The aspect ratio is large, but the process is complicated, the system is strongly acidic, the maintenance cost of equipment is high, and it is difficult to produce on a large scale
[0007] In summary, it is still difficult to produce ultra-long potassium tetratitanate whiskers on a large scale at present, and it is urgent to develop a simple, safe and reliable preparation method

Method used

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  • Preparation method of super-long potassium tetratitanate whisker
  • Preparation method of super-long potassium tetratitanate whisker
  • Preparation method of super-long potassium tetratitanate whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Metatitanic acid (TiO 2 ·nH 2 O) and potassium carbonate (K 2 CO 3 ) as raw material, according to TiO 2 / K 2The molar ratio of O=2.8:1 Weigh raw materials, adopt kneader to mix 6h, obtain TK mixture; Then add wheat flour with 0.05 times of TK mixture quality, carboxymethyl cellulose sodium with 0.01 times of TK mixture quality, TK mixture Potassium hydrogen tartrate of 0.01 times the mass of the material, glycerol accounting for 30wt% of the total mass of the mixture (metatitanic acid, potassium carbonate, additives and glycerin), kneaded for 6 hours, heated to 120 ° C for 2 hours with a kneader, and opened The kneader reverses the mode to pulverize, and sieves through 100 mesh to obtain a uniformly mixed powder.

[0041] Put the mixed powder in a crucible, put the crucible into a resistance furnace, heat from 30°C to 900°C at 5°C / min, keep the temperature at 900°C for 2 hours, cool with the furnace, take out the sintered product and disperse it with water, filter...

Embodiment 2

[0043] Anatase titanium dioxide (TiO 2 ) and potassium carbonate (K 2 CO 3 ) as raw material, first press TiO 2 / K 2 The molar ratio of O=3.0:1 Weigh raw materials, adopt ball milling mode 300r / min to mix 6h, obtain TK mixture; Then add the corn starch of TK mixture quality 0.1 times, the baking soda of TK mixture quality 0.01 times, TK mixture Sodium lauryl sulphate with 0.03 times the mass of the material, water accounting for 60wt% of the total mass of the mixture (anatase titanium dioxide, potassium carbonate, additives and water), ball milled for 6 hours, and the mixture after ball milling was dried at 120°C for 8 hours Remove moisture, grind, and sieve with 100 mesh to obtain the mixed powder.

[0044] Pour the mixed powder into a crucible, put the crucible into a resistance furnace, heat it from 30°C to 930°C at 5°C / min, keep the temperature at 930°C for 4 hours, cool with the furnace, take out the sintered product, disperse it with water, filter, and dry Finally, ...

Embodiment 3

[0046] Metatitanic acid (TiO 2 ·nH 2 O) and potassium carbonate (K 2 CO 3 ) as raw material, first press TiO 2 / K 2 The molar ratio of O=3.3:1 Weigh the raw materials and mix them for 6 hours by ball milling at 300r / min to obtain the TK mixture; then add silicon carbide with 0.1 times the weight of the TK mixture, sodium polyacrylate with 0.03 times the weight of the TK mixture, and TK Carbomer 941 with 0.01 times the mass of the mixture, ethanol accounting for 60wt% of the total mass of the mixture (metatitanic acid, potassium carbonate, additives and ethanol), ball milled for 6 hours, dried at 120°C for 1 hour, ground, sieved through 100 mesh, Obtain mixed powder.

[0047] Pour the mixed powder into a crucible, put the crucible into a resistance furnace, heat it from 30°C to 1000°C at 5°C / min, keep the temperature at 1000°C for 8 hours, cool with the furnace, take out the sintered product, disperse it with water, filter, and dry Finally, the finished ultra-long potassi...

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Abstract

The invention discloses a preparation method of a super-long potassium tetratitanate whisker. The method comprises the following steps: mixing a titanium-containing raw material and a potassium-containing raw material according to a TiO2 / K2O molar ratio of (2.5-3.5): 1, adding an additive and a solvent, mixing, drying, crushing and sieving to obtain mixed powder; and sintering the mixed powder, dispersing the sintered product with water, and drying to obtain the super-long potassium tetratitanate whisker. The method is simple in whole process flow operation, short in production period, low in cost and suitable for industrial production. The prepared potassium tetratitanate whisker is uniform in morphology, concretely, the diameter D of the whisker is 0.5-2 mu m, the length L is greater than or equal to 100 mu m, and L / D is 100-400. Compared with the potassium tetratitanate whisker without any additive or solvent, the potassium tetratitanate whisker prepared by the method disclosed by the invention is higher in quality, and the length-diameter ratio of the potassium tetratitanate is slender. Meanwhile, the sintered product is loose in structure, and the super-long potassium tetratitanate whisker can be obtained after the sintered product is dispersed with water and dried.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a method for preparing ultra-long potassium tetratitanate whiskers. Background technique [0002] Potassium tetratitanate whisker is an inorganic functional fiber. The chemical formula of potassium tetratitanate is K 2 Ti 4 o 9 , where the coordination number of Ti is 6, TiO 6 The octahedron forms a chained layered structure through coplanarity and common edges, K + The ions are located between the layers and have ion exchange properties. Therefore, potassium tetratitanate can be used to remove heavy ions in water and radioactive heavy metal ions in nuclear waste. In addition, potassium tetratitanate can be used as a reinforcing material to improve the weather resistance and corrosion resistance of cement, paint and civil construction materials. At the same time, K is an essential element for life, Ti also has excellent biocompatibility, and potassium tetratitanate is an ...

Claims

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Application Information

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IPC IPC(8): C30B29/32C30B29/62C30B1/02C30B1/10
CPCC30B29/32C30B29/62C30B1/02C30B1/10
Inventor 刘畅黄通王迅
Owner NANJING UNIV OF TECH
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