Method of preparing nano titanium dioxide granule with surface coated of aluminium oxide

A technology of nano-titanium dioxide and alumina nano-technology, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., to achieve good dispersion performance, simple method, and easy operation

Inactive Publication Date: 2003-11-12
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been reported to treat nano-TiO2 with alumina

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 250g Ti(OC 4 h 9 ) 4 Dissolve in 2500ml ethanol to get Ti(OC 4 h 9 ) 4 Solution A; The ethanol of 1320ml is dissolved in the water of 1320ml, is solution B; Prepare sodium aluminate alkali solution C (mass percentage concentration: Al 2 o 3 %=0.28%, NaOH%=0.45%), at room temperature, within 50 minutes, pump the solution A into the vigorously stirred solution B, continue to stir for 15 minutes, filter with suction, dry the dry gel at 110°C for 15 hours . Grinding the above dry gel, sieving through an 80-mesh micro-sieve, and calcining at 500° C. for 1 hour to obtain anatase nano-titanium dioxide. Disperse 10g of the above-mentioned nano-titanium dioxide in 300ml of water, press P 2 o 5 :TiO 2 =0.1% Add the dispersant sodium hexametaphosphate, adjust the pH to 10 with 1M NaOH, and ultrasonically disperse for 50 minutes. Nano TiO 2 The slurry, under stirring, was heated to 85 °C, then adjusted to pH 8.5, and then solution C was added within 40 min to Al 2 o 3...

Embodiment 2

[0023] Using the preparation process of the above-mentioned Example 1, the difference is that the dry gel powder is roasted at a temperature of 800 ° C for 10 hours to obtain rutile nano-titanium dioxide. Continue to use the above steps for aluminum oxide coating to obtain monodisperse oxide Aluminum-coated rutile nano-titanium dioxide. The diameter of the nano anatase titanium dioxide particle is 90-100nm observed under an electron microscope.

Embodiment 3

[0025] 25g Ti(OC 4 h 9 ) 4 Dissolve in 500ml ethanol, get solution A; The ethanol of 130ml is dissolved in the water of 370ml, is solution B; Prepare sodium aluminate alkali solution C (concentration: Al 2 o 3 %wt=0.28%, NaOH%wt=0.45%), at room temperature, pump solution A into the vigorously stirred solution B within 60 minutes, continue to stir for 15 minutes, filter with suction, and bake at 100°C-130°C for 15 hours dry xerogel. Grinding the above dry gel, sieving through an 80-mesh micro-sieve, and calcining at 500° C. for 1 hour to obtain anatase nano-titanium dioxide. Disperse 8g of the above-mentioned nano-titanium dioxide in 300ml of water, press P 2 o 5 :TiO 2 =0.1%wt Add the dispersant sodium hexametaphosphate, adjust the pH to 10 with 2.5M NaOH, and ultrasonically disperse for 50 minutes. Nano TiO 2 The slurry, under stirring, was heated to 85°C, then the pH value was adjusted to 8.5, and then solution C was added in a constant flow within 45 minutes, with ...

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Abstract

The preparation method of nano titanium dioxide granule whose surface is coated with aluminium oxide includes the following steps: adopting gel-sol method to synthesize nano titanium dioxide, then coating its surface with aluminium oxide. The grain diameter of the prepared nano titanium dioxide is 10-100 nm, its surface is coated with aluminium oxide membrane. Said nano titanium dioxide coated with aluminium dioxide has good dispersion property, can implement single granule dispersion, can be used as excellent UV-ray screening agent, and can be used in the fields of paint, rubber, fibre, coating material, sun protection products, printing ink and food package, etc.

Description

[0001] Field: [0002] The invention belongs to a method for synthesizing inorganic nanometer materials, in particular to a method for preparing nanometer titania particles coated with aluminum oxide on the surface. Background technique: [0003] The primary particle diameter of nano-titanium dioxide is between 10-100nm, which loses its blocking effect on visible light and becomes a "transparent titanium dioxide" that can absorb and scatter ultraviolet light with shorter wavelengths. It has excellent ultraviolet light shielding properties, can shield long-wave (380-320nm), medium-wave (320-290nm) and short-wave (290-220nm) ultraviolet rays, has the incomparable superiority of organic ultraviolet light shielding agents, and has corrosion resistance , high chemical stability, non-toxic, as an excellent ultraviolet light shielding agent, it is widely used in high-quality coatings, rubber, fibers, paints, sunscreen skin care products, inks, food packaging and other fields. [000...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06
Inventor 孙予罕吴东李志杰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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