Synthesis method of sodium hexatitanate whisker

A technology of sodium hexatitanate whisker and synthesis method, applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve the problems of high hardness, inability to form particles, large particles, etc., and achieve high infrared reflectivity , Small thermal conductivity, good uniformity

Active Publication Date: 2009-02-11
SHANGHAI JINGXU COMPOSITE MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The fluidity of molten sodium trititanate is poor, and it is not easy to pour out;
[0006] 2. Even if it is quenched on special equipment, there will be larger particles or even large blocks, and particles with a particle size of less than 0.1mm cannot be formed;
[0007] 3. Granular and massive sodium trititanate must be mechanically broken into particles smaller than 0.1mm before the next operation can be performed. This operation is very destructive to sodium titanate whiskers, because trititanate The sodium whisker block is very hard, and the sodium ions cannot be dissolved until it is broken to a certain fineness;
[0008] 4. During the recrystallization process, the sodium hexatitanate whiskers are easy to agglomerate and form agglomerates, and have high hardness, which also requires mechanical crushing to separate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Mix anatase titanium dioxide and anhydrous sodium carbonate according to TiO 2 : Na 2 O=2.4 The ratio weighing of mol ratio, the raw material that has weighed is mixed evenly with the mixer, pours into crucible;

[0026] (2) Fix the above-mentioned crucible in a high-temperature furnace at 1200° C., and stay there for 50 minutes to make the raw material mixture into a melt;

[0027] (3) The above-mentioned high-temperature furnace is tilted slowly, and the melt flows out evenly from the crucible, and enters the special quenching machine with cold water at the bottom and pressure spraying water mist at high speed, forming uniform particle size less than 100μ in the water Particles; solid-liquid separation, liquid into the reactor;

[0028] (4) Enter the above-mentioned fine powder into a reactor containing 5% sulfuric acid at 80° C. according to the solid-to-liquid ratio of 1:10, and react for 240 minutes;

[0029] (5) Filter the solution in the above-mentioned re...

Embodiment 2

[0032] (1) Mix anatase and anhydrous sodium bicarbonate according to TiO 2 : Na 2 O=2.7 The proportion weighing of mol ratio, the fluxing agent sodium sulfate is weighed by 2% of total amount, the raw material that weighs is mixed evenly with the mixing machine, pours into crucible;

[0033] (2) Fix the above-mentioned crucible in a high-temperature furnace at 1100° C., and stay there for 90 minutes to make the raw material mixture into a melt;

[0034] (3) The above-mentioned high-temperature furnace is tilted slowly, and the melt flows out evenly from the crucible, and enters the special quenching machine with cold water at the bottom and pressure spraying water mist at high speed, forming uniform particle size less than 100μ in the water Particles; solid-liquid separation, liquid into the reactor;

[0035] (4) Put the above-mentioned fine powder into a reactor containing 10% sulfuric acid at 90°C according to the solid-to-liquid ratio of 1:8, and react for 300 minutes;

...

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Abstract

The invention discloses a preparation method of potassium hexatitanate crystal whiskers, which adopts a technique of melting and quenching for synthesis and has convenient and feasible process flow. First, raw materials containing titanium and gallium are mixed with fluxing agent in a mixer, put into a crucible which is fixed onto a high-temperature furnace and sintered. The high-temperature furnace is leaned in order that the molten mass can flow out equably into special quenching equipment with cold water and water fog at the bottom for quenching. Then, the acid solution dissolves out a part of the sodion and is filtered, washed, soaked by surface active agent and then sintered for recrystallization, thereby obtaining the end product. No agglomeration and aggregation appears in the process of recrystallization. There is no pollution throughout the process. The potassium hexatitanate crystal whiskers produced by the synthetic method of the invention have an average length of 5 to 50um, an average diameter of 0.5 to 3um with a yield higher than 95%, and have the advantages of low thermal conductivity, high infrared reflectivity and low cost.

Description

technical field [0001] The invention belongs to a method for manufacturing inorganic salt whiskers, in particular to a method for manufacturing sodium hexatitanate whiskers. Background technique [0002] In the synthesis of sodium hexatitanate whiskers, there are mainly hydrothermal methods, that is, hydrothermal synthesis under high temperature and high pressure. The sintering method can also synthesize sodium hexatitanate whiskers, but the separation is extremely difficult and almost inseparable. The synthesis method of sodium titanate nanotubes has extremely high requirements on raw materials and very harsh conditions, making it difficult to realize industrialization, and the cost is also high, which is difficult for users to accept. [0003] In the prior art, Chinese patent application No. 200610029749.4 discloses a method for producing sodium hexatitanate whiskers, mixing titanium-containing raw materials, sodium-containing raw materials and flux, putting them into a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B29/62
Inventor 黄继芬岳双霞
Owner SHANGHAI JINGXU COMPOSITE MATERIAL
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