Preparation method of coated modified nanometer titanium dioxide

A nano-titanium dioxide and modification technology, which is applied in the field of preparation of surface-coated modified nano-titanium dioxide, can solve the problems of poor dispersion and particle enlargement, and achieve the effects of improved dispersion, improved performance, and good application prospects

Inactive Publication Date: 2014-08-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, in order to reduce the surface energy of the nanoparticles, they will automatically change towards the direction of the reduction of the surface area, resulting in the aggregation of the nanoparticles; at the same time, under certain conditions, the hydroxyl groups on the surface of the nanoparticles are prone to dehydration and cause the agglomeration of the particles, thus making Increased particle size and poor dispersibility

Method used

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  • Preparation method of coated modified nanometer titanium dioxide
  • Preparation method of coated modified nanometer titanium dioxide
  • Preparation method of coated modified nanometer titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Weigh 25g of titanyl sulfate (TiOSO 4 ) was dissolved in 500ml deionized water to obtain a titanyl sulfate solution, and 12g of sodium hydroxide (NaOH) was dissolved in 200ml of deionized water to obtain a sodium hydroxide solution. Titanium solution to pH=7 to obtain nano-titanium dioxide precursor;

[0025] 2) Transfer the nano-titanium dioxide precursor to an autoclave, conduct a hydrothermal reaction at 160°C for 8 hours, then cool to room temperature, filter and wash to obtain a filter cake, which does not require drying;

[0026] 3) Redisperse 6g of the filter cake obtained in step 2) in 100ml of water, then add 0.24g of methyl acrylate, stir continuously at 70°C for 30min, then add 0.1g of potassium persulfate to react for 60min, then filter, wash, and drying to obtain polymethyl acrylate-coated and modified nano-titanium dioxide powder.

[0027] Compared with the sample obtained in Comparative Example 1, the X-ray diffraction pattern of the modified nano-ti...

Embodiment 2

[0029] 1) Weigh 5g of titanyl sulfate (TiOSO 4 ) was dissolved in 500ml deionized water to obtain a titanyl sulfate solution, and 4g of sodium hydroxide (NaOH) was dissolved in 200ml of deionized water to obtain a sodium hydroxide solution. Titanium solution to pH=7 to obtain nano-titanium dioxide precursor;

[0030] 2) Transfer the nano-titanium dioxide precursor to an autoclave, conduct a hydrothermal reaction at 200°C for 15 hours, then cool to room temperature, filter and wash to obtain a filter cake, which does not require drying;

[0031] 3) Redisperse 10 g of the filter cake obtained in step 2) in 120 ml of water, then add 0.6 g of ethyl acrylate, stir continuously at 80 ° C for 30 min, then add 0.2 g of sodium persulfate to react for 90 min, then filter, wash, Dry to obtain polyethyl acrylate-coated and modified nano-titanium dioxide powder.

[0032] The X-ray diffraction analysis figure and the scanning electron microscope figure of the nano-titanium dioxide coated ...

Embodiment 3

[0034] 1) Weigh 25g of titanyl sulfate (TiOSO 4 ) was dissolved in 500ml deionized water to obtain a titanyl sulfate solution, and 12g of sodium hydroxide (NaOH) was dissolved in 200ml of deionized water to obtain a sodium hydroxide solution. Titanium solution to pH=7 to obtain nano-titanium dioxide precursor;

[0035] 2) Transfer the nano-titanium dioxide precursor to an autoclave, conduct a hydrothermal reaction at 230°C for 24 hours, then cool to room temperature, filter and wash to obtain a filter cake, which does not require drying;

[0036] 3) Redisperse 12g of the filter cake obtained in step 2) in 150ml of water, then add 0.36g of butyl acrylate, stir continuously at 90°C for 30min, then add 0.5g of ammonium persulfate to react for 120min, then filter, wash, and drying to obtain polybutyl acrylate-coated and modified nano-titanium dioxide powder.

[0037] The X-ray diffraction analysis figure of the nano-titanium dioxide coated and modified by polybutyl acrylate obta...

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Abstract

The invention discloses a preparation method of surface coated modified nanometer titanium dioxide, which effectively reduces nanometer powder agglomeration and improves dispersibility. The method comprises the following steps: with water as a solvent, titanyl sulfate as a titanium source and sodium hydroxide as precipitator, performing a precipitation process to obtain a nanometer titanium dioxide precursor; then transferring the precursor into a high-pressure reaction kettle to undergo hydrothermal reaction, thereby obtaining a mother solution of nanometer titanium dioxide; and performing filtration washing, directly dispersing filter cakes into water, adding watersoluble acrylate, and reacting under certain conditions to polymerize the watersoluble acrylate on the surface of titanium dioxide, thereby obtaining the polyacrylate coating modified nanometer titanium dioxide powder. Compared with unmodified samples, the modified nanometer titanium dioxide has greatly improved dispersibility, remarkably diminished particle size and obviously enhanced performance. The modification method enables the nanometer titanium dioxide to obtain a very good application prospect in the aspects of coating, paint spraying, sunscreen cream, sewage treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic powder nano-materials, and in particular relates to a preparation method of surface-coated modified nano-titanium dioxide capable of effectively reducing nano-powder agglomeration and improving dispersibility. Background technique [0002] Nano-titanium dioxide, also known as titanium dioxide, has physical properties of fine particles with a particle size below 100nm. The appearance of the product is white loose powder. It has anti-ultraviolet, antibacterial, self-cleaning, and anti-aging properties. It can be used in cosmetics, functional fibers, plastics, Ink, paint, paint, fine ceramics and other fields. In addition, nano-titanium dioxide is widely used in the field of photocatalysis because of its excellent optical properties, and it is a hot spot in the field of photocatalysis. At present, there are many methods for preparing nano-titanium dioxide, and the commonly used meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/10
Inventor 金鑫黄亚楠
Owner BEIJING UNIV OF CHEM TECH
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