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Preparation method of hollow titanium dioxide microspheres

A technology of titanium dioxide and hollow microspheres, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of high cost and troublesome preparation process, and achieve the effects of uniform size, controllable shell thickness and convenient source of raw materials

Active Publication Date: 2013-10-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method successfully prepared hollow titanium dioxide, in the process of preparing polymer microsphere templates, due to the use of two comonomers, expensive water-soluble initiators and the need to adjust the ionic strength of the emulsion, the preparation process is relatively troublesome and the cost is high

Method used

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  • Preparation method of hollow titanium dioxide microspheres
  • Preparation method of hollow titanium dioxide microspheres
  • Preparation method of hollow titanium dioxide microspheres

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preparation example Construction

[0024] A preparation method of hollow titanium dioxide microspheres, the preparation process is as follows Figure 4 Shown:

[0025] The first step, the preparation of the template containing carboxyl copolymer microspheres on the surface: add deionized water, styrene (St), methacrylic acid (MAA), water-soluble initiator in sequence in the reactor, under nitrogen, heat up and stir, and react After centrifugation, separation, washing, and drying, the polymer microsphere template containing carboxyl groups on the surface is obtained; in terms of weight fraction, 100 parts of deionized water, 10 parts of styrene (St), and 1-3 parts of methacrylic acid (MAA) , 0.03-0.065 parts of water-soluble initiator;

[0026] The second step, the preparation of the positively charged template microsphere emulsion on the surface: add polymer microspheres, cationic surfactant, absolute ethanol, deionized water in the reactor successively, and ultrasonically disperse to form a white emulsi...

Embodiment 1

[0030] The first step, the preparation of the template containing carboxyl copolymer microspheres on the surface: add 100 parts of deionized water, 10 parts of styrene (St), and 1 part of methacrylic acid (MAA) in a 250ml four-necked flask, and raise the temperature under nitrogen , with mechanical stirring at a stirring rate of 200r / min. When the reaction temperature rose to 60°C, 0.03 parts of potassium persulfate (KPS) was added at one time to react for 8 hours, and then the reaction was terminated. centrifugation and separation, the centrifugation rate is 6000r / min, the centrifugation time is 5min, washing, vacuum drying, the drying temperature is 60°C, and the drying time is 6h, to obtain the polymer microsphere template containing carboxyl groups on the surface;

[0031] The second step, the preparation of positively charged template microsphere emulsion on the surface: add 0.2 parts of polymer microspheres, 0.03 parts of cetyltrimethylammonium bromide (CTAB) as a cationi...

Embodiment 2

[0035]The first step, the preparation of the template containing carboxyl copolymer microspheres on the surface: add 100 parts of deionized water, 10 parts of styrene (St), and 2 parts of methacrylic acid (MAA) in a 250ml four-neck flask, and raise the temperature under nitrogen , with mechanical stirring at a stirring rate of 200r / min. When the reaction temperature rose to 65°C, 0.04 parts of potassium persulfate (KPS) was added at one time to react for 10 hours, and then the reaction was terminated. centrifugation and separation, the centrifugation rate is 6000r / min, the centrifugation time is 5min, washing, vacuum drying, the drying temperature is 60°C, and the drying time is 6h, to obtain the polymer microsphere template containing carboxyl groups on the surface;

[0036] The second step, the preparation of the positively charged template microsphere emulsion on the surface: add 0.2 parts of polymer microspheres, 0.045 parts of cetyltrimethylammonium bromide (CTAB) as the c...

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Abstract

The invention discloses a preparation method of hollow titanium dioxide microspheres. The invention is realized through the following technical scheme: first preparing polymer microspheres through using a method of soap-free emulsion polymerization and using styrene as a monomer, methyl acrylic acid as a comonomer, deionized water as a reaction medium, and potassium persulfate as an initiator; forming an emulsion through ultrasonic dispersion of the prepared polymer microspheres, cationic surfactant cetyl trimethyl ammonium bromide, absolute ethyl alcohol, and the deionized water; adding a mixed solution of ethanol, butyl titanate and triethylamine, obtaining core shell particles through reflux reaction for 4 hours at 50 DEG C with mechanical stirring, and finally obtaining the hollow titanium dioxide microspheres through calcining. According to the preparation method, the triethylamine is used as an inhibitor, titanium dioxide smoothly and uniformly coats surfaces of the polymer microspheres through control of hydrolysis rate of the butyl titanate, and the hollow titanium dioxide microspheres with a higher yield are obtained.

Description

technical field [0001] The invention belongs to the preparation technology of novel materials with special morphology, and specifically relates to a preparation method of hollow titanium dioxide microspheres. The prepared hollow titanium dioxide microspheres are expected to be applied to fuel-sensitized solar cells, catalyst carriers, drug controllable release carriers, Wastewater treatment and other fields. Background technique [0002] Due to the characteristics of high specific surface area, low density, and good surface permeability, inorganic hollow particles can accommodate a large number of guest molecules, which is easy to produce encapsulation or wrapping effects, so that hollow particles are widely used in the fields of medicine, chemical industry, and wastewater treatment. With broad application prospects. Titanium dioxide (TiO 2 ) is a fine inorganic multifunctional material that has been studied more, and it is also an important semiconductor, catalysis, and c...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 肖正刚赵祥郭萍
Owner NANJING UNIV OF SCI & TECH
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