Method for preparing high-concentration emulsion from modified nano titanium dioxide powder

A nano-titanium dioxide, concentrated emulsion technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of preparing high-concentration emulsion and so on

Inactive Publication Date: 2011-06-01
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiency that the prior art cannot use particle stabilization methods to prepare high-concentration emulsions, the present invention provides a method for modifying nano-titanium dioxide powders. Liquid-phase modification is used to avoid hard agglomeration of nano-powders due to grinding and calcination. Nano-titanium dioxide powder with better amphiphilic surface is prepared only by controlling the amount of modified acid added and the reaction time.

Method used

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  • Method for preparing high-concentration emulsion from modified nano titanium dioxide powder
  • Method for preparing high-concentration emulsion from modified nano titanium dioxide powder
  • Method for preparing high-concentration emulsion from modified nano titanium dioxide powder

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Get 1 gram of nano-titanium dioxide powder with a particle size of 24nm, under magnetic stirring at 1000rmp, disperse in a mixed solution of 50 ml of chloroform and 50 ml of oleic acid, and react for 2 hours at 30 degrees Celsius;

[0020] Add 100 ml of methanol to stop the reaction and precipitate, centrifuge the flocculated precipitate at 20,000 rpm, remove the supernatant to obtain a light blue gel-like modified nano-titanium dioxide, then add 20 ml of chloroform to rinse for 20 minutes, and centrifuge again at high speed; add 50 Wash with 1 ml of methanol, centrifuge at a high speed, and wash with methanol for 3 times, and place the obtained gel-like product in a vacuum oven, dry at 120 degrees Celsius for 24 hours, take it out and grind it lightly to obtain the modified nano-titanium dioxide powder.

[0021] Get 0.3 g of the prepared modified nano-titanium dioxide powder, add it to 30 milliliters of xylene, ultrasonically disperse it for 15 minutes (60KHz, power 200...

Embodiment 2

[0025] Take 1 gram of nano-titanium dioxide powder with a particle size of 22nm, disperse it in a mixed solution of 30 ml of chloroform and 70 ml of oleic acid under magnetic stirring at 1200 rpm, and react at 25 degrees Celsius for 5 hours.

[0026] Add 100 ml of methanol to stop the reaction and precipitate, centrifuge the flocculated precipitate at 20,000 rpm, remove the supernatant to obtain a light blue gel-like modified nano-titanium dioxide, then add 20 ml of chloroform to rinse for 20 minutes, and centrifuge again at high speed; add 50 Washing with one milliliter of methanol, high-speed centrifugation, and repeated washing with methanol for 5 times, the obtained gel-like product was placed in a vacuum oven, dried at 120 degrees Celsius for 24 hours, taken out and lightly ground to obtain the modified nano-titanium dioxide powder.

[0027] Get the modified nano-titanium dioxide powder that 0.5 gram makes, add in 50 milliliters of styrenes, high-speed stirring 15 minutes ...

Embodiment 3

[0030] Take 1 gram of nano-titanium dioxide powder with a particle size of 25.4nm, and disperse it in a mixed solution of 40 milliliters of chloroform and 60 milliliters of oleic acid under magnetic stirring at 1000 rpm, and react at 25 degrees Celsius for 4 hours.

[0031] Add 100 ml of methanol to stop the reaction and precipitate, centrifuge the flocculated precipitate at 20,000 rpm, remove the supernatant to obtain a light blue gel-like modified nano-titanium dioxide, then add 20 ml of chloroform to rinse for 20 minutes, and centrifuge again at high speed; add 50 Wash with 1 ml of methanol, centrifuge at high speed, and repeat the washing with methanol for 5 times, place the obtained gel-like product in a vacuum oven, dry at 120 degrees Celsius for 24 hours, take it out and grind it lightly to obtain the modified nano-titanium dioxide powder.

[0032] Get 0.5g of modified nano-titanium dioxide powder, add 25ml of styrene and 25ml of divinylbenzene in the mixed oil phase, an...

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Abstract

The invention discloses a method for preparing a high-concentration emulsion from modified nano titanium dioxide powder. The adoption of the liquid phase modification avoids grinding, calcining and other processing means which easily cause nano powder to generate hard agglomerates; and the method disclosed by the invention can be used for preparing nano titanium dioxide powder with favorable amphiphilic surfaces only by controlling the addition amount of the acid for modification and the reaction time. The powder can be used for preparing a stable high-concentration emulsion under the action of ultrasonic or stirring; the nano titanium dioxide powder stably exists on the oil-water interface to prevent dispersed oil and water from agglomerating into large liquid drops and causing phase splitting, thereby stabilizing the emulsion; and the prepared emulsion can be stably stored for more than 3 months at room temperature without producing obvious emulsion breaking.

Description

technical field [0001] The invention relates to a method for preparing a high-concentration emulsion, in particular to a method for preparing a high-concentration emulsion by modifying nano titanium dioxide powder. Background technique [0002] High-concentration emulsion, also known as high internal phase emulsion, refers to an emulsion whose volume fraction of the internal phase (dispersed phase) is above 74%, or even as high as 99%. When the continuous phase of the high-concentration emulsion is polymerized and the dispersed phase is removed, a porous material with a high porosity and regular pore structure can be obtained. The high internal phase emulsion template method has the advantage of precisely controlling the size and distribution of pore and channel diameters. High-concentration emulsion refers to a high-concentration emulsion stabilized by solid particles instead of traditional surfactants. The high-concentration emulsion has the characteristics of high stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F112/08C08F212/36C08F212/08C08K9/04C08K3/22C08J9/28C01G23/053
Inventor 倪永罗超刘琳朱君
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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