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A kind of method for preparing monodisperse rutile nano-titanium dioxide

A nano-titanium dioxide and rutile-type technology, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., to achieve the effects of low cost, high yield and simple process

Active Publication Date: 2018-03-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The present invention provides a method for stably preparing monodisperse rutile nano-titanium dioxide particles that can effectively solve the problem of sintering between nano-titanium dioxide particles in the high-temperature calcination process, which is fast and simple, saves material costs and simple procedures, and greatly improves the yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 3 grams of anatase-type nano-titanium dioxide hydrosol containing 10% by weight, weigh 0.6 grams of potassium chloride, add it to the anatase-type nano-titanium dioxide hydrosol, and ultrasonically disperse to form a transparent hydrosol containing potassium chloride. The hydrosol was mixed with 5 ml of absolute ethanol, the precipitate was centrifuged, dried, and calcined at 750° C. for 1 hour. After cooling, the potassium chloride salt was washed off with deionized water, and monodisperse rutile nano-titanium dioxide was obtained after drying.

Embodiment 2

[0034]Take 3 grams of anatase-type nano-titanium dioxide hydrosol containing 10% by weight, weigh 0.6 grams of potassium bromide, add it to the anatase-type nano-titanium dioxide hydrosol, and ultrasonically disperse to form a transparent hydrosol containing potassium bromide. The aqueous sol was mixed with 5 ml of absolute ethanol, the precipitate was centrifuged, dried, and calcined at 700°C for 1 hour. After cooling, the potassium bromide salt was washed off with deionized water, and monodisperse rutile nano-titanium dioxide was obtained after drying.

Embodiment 3

[0036] Take 3 grams of anatase-type nano-titanium dioxide hydrosol containing 10% by weight, weigh 0.6 grams of sodium chloride, add it to the anatase-type nano-titanium dioxide hydrosol, and ultrasonically disperse to form a transparent hydrosol containing sodium chloride. The hydrosol was mixed with 5 ml of absolute ethanol, the precipitate was centrifuged, dried, and calcined at 600° C. for 2 hours. After cooling, the sodium chloride salt was washed off with deionized water, and monodisperse rutile nano-titanium dioxide could be obtained after drying.

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Abstract

The invention discloses a mono-dispersed rutile type nanometer titanium dioxide preparation method, which comprises: preparing a transparent hydrosol containing a soluble salt and anatase type nanometer titanium dioxide, mixing the hydrosol and a weak polarity solvent to make the soluble salt be precipitated, co-precipitating with nanometer anatase type nanometer titanium dioxide particles, centrifugating the co-precipitate, drying, calcining at a high temperature to make the anatase type nanometer titanium dioxide be changed into rutile type titanium dioxide, washing with deionized water to remove the soluble salt in the calcined product, and drying to obtain the mono-dispersed rutile type nanometer titanium dioxide particles, wherein during the process, the soluble salt provides the isolation effect, such that the agglomeration and the sintering of the titanium dioxide particles during the high temperature calcining process can be effectively avoided. With the method of the present invention, the large amount of the mono-dispersed rutile type nanometer titanium dioxide can be rapidly prepared, the process is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the field of nano material preparation and relates to a method for preparing monodisperse rutile nano titanium dioxide. Background technique [0002] Nanoscale titanium dioxide, with a particle diameter of 1nm to 100nm, is widely used in cosmetics, functional fibers, plastics, inks, coatings, paints, fine ceramics and other fields. [0003] Nano titanium dioxide mainly has two crystal forms of anatase and rutile, and anatase titanium dioxide transforms into rutile at above 600°C. Compared with anatase type, rutile type titanium dioxide has a higher dielectric constant, higher hardness, less hygroscopicity, and better light and heat resistance, so it is more widely used in the electronics industry and coating industry. The price of rutile titanium dioxide is also high, so it is often used in high-end products, such as paint, ink, lacquer wood and other high-end water printing all use rutile titanium dioxide. [0004] The prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047B82Y30/00
CPCB82Y30/00C01G23/08
Inventor 董岩宋立邵起越蒋建清
Owner SOUTHEAST UNIV