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Preparation method of nanometer zinc oxide

A nano-zinc oxide, zinc source technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems such as the inability to prepare special crystal forms and morphology, strict control conditions, and difficulty in preparing ZnO, and achieve acceptable morphology. control, high purity and uniform morphology

Inactive Publication Date: 2007-07-04
SUZHOU UNIV
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Problems solved by technology

The physical method (mechanical method) is to use special crushing technology to crush ordinary powder, but due to the limitations of existing crushing technology and equipment, it is difficult to prepare real nano-scale ZnO, and at most only submicron particles can be obtained Chemical method mainly contains sol-gel method, microemulsion method, spray drying method, plasma method, combustion method, precipitation method, chemical vapor deposition (CVD) method, laser CVD method, etc. at present, although these methods all can Nanoscale ZnO is prepared, but there are also some weaknesses: longer reaction time or lower yield, strict control conditions, inability to prepare nanocrystalline particles with special crystal form and morphology, etc.

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  • Preparation method of nanometer zinc oxide
  • Preparation method of nanometer zinc oxide

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Embodiment 1

[0034] Embodiment one: a kind of preparation method of nano-zinc oxide former powder, with the ZnSO that concentration is 0.15mol / L 4 ·7H 2O is a raw material, urea is a precipitant host, and the microwave radiation temperature is maintained at 93° C., and the mol ratio of the reactant zinc sulfate to urea is 1: 2. After the reaction is completed, the precipitate basic zinc carbonate is used respectively Ammonia water with pH=9.0 and absolute ethanol were washed 3 to 4 times respectively, and the precipitate after washing was dried and ball milled in a vacuum dryer to obtain solid basic zinc carbonate powder, which was then roasted at about 380°C for 3 hours, and then ball milled. Nano ZnO powder is obtained.

[0035] Its reaction device is shown in accompanying drawing 1 with reference to, and the microwave oven is provided with the reaction vessel with three inlets, corresponding to the reaction vessel inlets, there are three mouths on the top of the microwave oven, the inl...

Embodiment 2

[0037] Embodiment two: a kind of preparation method of nano zinc oxide former powder, be the ZnSO of 0.2mol / L with concentration 4 ·7H 2 O is the raw material, urea is the precipitant host, and the microwave radiation temperature is maintained at about 90°C. The molar ratio of the reactant zinc sulfate to urea is 1:3. After the reaction is completed, the precipitate basic zinc carbonate is separated Wash with ammonia water of pH=9.0 and absolute ethanol for 3 to 4 times respectively, then dry in a vacuum dryer and ball mill, roast the solid basic zinc carbonate powder at 400°C for 2 hours, and finally ball mill to obtain nano ZnO powder.

[0038] Its reaction device is shown in accompanying drawing 4, and what is different from embodiment one is that the injection port of its coolant is replaced with a built-in condensation pipe, except having the common feature of embodiment one device, its cooling effect is good, can effectively The use of microwave non-thermal effect. Whe...

Embodiment 3

[0039] Embodiment three: a kind of preparation method of nano-zinc oxide former powder, its reaction device is shown in accompanying drawing 6, and the container that fills reactant solution is placed outside microwave oven (see the circular container above microwave oven), and reactant passes through water pump After passing through the flow meter and measuring the temperature with the thermometer, it is transported to the spiral tube placed in the microwave oven to receive microwave irradiation. The other end of the spiral tube is connected to the cooling pipe through the thermometer outside the furnace, and the outlet of the cooling pipe is connected to the circular container for cooling. The final reactant returns to the circular container to form a cycle. Compared with two devices in embodiment one and two, the average power of microwave radiation during reaction can be known by the flow rate of flowmeter and the display reading of thermometer, and the cooling effect is be...

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Abstract

A process for preparing nano-zinc oxide includes such steps as dissolving soluble Zn salt and urea in water, microwave radiating while reacting by homogenizing-depositing method to obtain the deposit of alkaline zinc carbonate, vacuum drying, ball grinding, calcining to obtain the crystal grains of nano-zinc oxide, mixing with surface modifier, organic solvent and disperser, ball grinding, and microwave radiating which surface modifying.

Description

technical field [0001] The invention relates to a method for preparing non-agglomerated, lipophilic nano-zinc oxide, in particular to a method for preparing various zinc oxide nano-grains under microwave irradiation, a method for surface modification of nano-zinc oxide, and a corresponding device of. Background technique [0002] A nanometer is one billionth of a meter. When the scale of a material enters the nanoscale, it has many special properties, such as surface effects, volume effects, and quantum effects. Nano-zinc oxide is one of the few oxide-type semiconductor materials that can achieve quantum size effects. It is non-flammable, non-toxic, and has a series of excellent physical and chemical properties such as non-migration, fluorescence, piezoelectricity, absorption and scattering of ultraviolet rays. At the same time, the price is low, so it is widely used in the preparation of ultraviolet shielding materials, sunscreen, radar absorbing m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02
Inventor 洪若瑜潘婷婷
Owner SUZHOU UNIV
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