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Method for preparing zinc oxide material

A technology of zinc oxide and raw materials, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of complex process control, high temperature reaction, poor particle uniformity, etc., and achieve good doping uniformity, low reaction temperature and low cost. Effect

Inactive Publication Date: 2008-07-09
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its preparation method is mainly the liquid phase method, and these methods have the disadvantages of high temperature reaction, complicated process control, and poor particle uniformity.

Method used

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  • Method for preparing zinc oxide material
  • Method for preparing zinc oxide material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1.1 Reagents, drugs and instruments

[0026] Instruments: Shimadzu AY220 electronic analytical balance, muffle furnace, XRD-6000X-ray powder diffractometer, NICOLETSXB Fourier transform infrared spectrometer, JSM-5510LV scanning electron microscope.

[0027] Reagents: zinc oxide (analytical grade, Tianjin Kemiou Chemical Reagent Development Center); urea (analytical grade, Sinopharm Chemical Reagent Co., Ltd.).

[0028] 1.2 Experimental process

[0029] Mix zinc oxide raw material and urea uniformly in a molar ratio of 1:4, add water to make a rheological state, the molar ratio of zinc oxide raw material to water {ZnO:H 2 O}=0.5, after grinding evenly, a slurry is obtained; the slurry is reacted at 300°C to form a jelly (transparent colloid); the jelly is hydrolyzed under high-speed stirring; the hydrolyzate is thermally decomposed at a temperature of 120°C to obtain white ZnO powder. At 4000~400cm -1 Record the IR spectrum of the hydrolyzate and thermal decompositi...

Embodiment 2

[0038] A preparation method of zinc oxide material, it comprises the steps:

[0039] 1) Selection of raw materials: according to the molar ratio of zinc oxide raw material to urea {ZnO:CO(NH 2 ) 2} is 0.33, the molar ratio of zinc oxide raw material to water {ZnO:H 2 O}=0.3, choose zinc oxide raw material, urea and water, standby;

[0040] 2) mixing the zinc oxide raw material, urea and water, and grinding the mixture evenly to obtain a slurry;

[0041] 3) Heating to gel: heating the slurry obtained in step 2) at 300°C to obtain a transparent gel;

[0042] 4) hydrolysis and thermal decomposition: the colloid obtained in step 3) is hydrolyzed (hydrolyzed with water) at room temperature, filtered to obtain a hydrolyzate containing urea, cyanamide and melamine (wherein cyanamide accounts for more than 70% of the mass fraction of the three products ); heating the filter residue at 120° C. to decompose to obtain a zinc oxide material.

Embodiment 3

[0044] A preparation method of zinc oxide material, it comprises the steps:

[0045] 1) Selection of raw materials: according to the molar ratio of zinc oxide raw material to urea {ZnO:CO(NH 2 ) 2} is 0.25, the molar ratio of zinc oxide raw material to water {ZnO:H 2 O}=0.3, choose zinc oxide raw material, urea and water, standby;

[0046] 2) mixing the zinc oxide raw material, urea and water, and grinding the mixture evenly to obtain a slurry;

[0047] 3) Heating to gel: heating the slurry obtained in step 2) at 300°C to obtain a transparent gel;

[0048] 4) Thermal decomposition: heat the colloid obtained in step 3) to 420° C. and decompose to obtain a zinc oxide material.

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Abstract

The invention relates to a process for preparing zinc oxide material. The preparing process for zinc oxide material is characterized in that the preparing process includes the following steps: 1) selection of material: selecting material containing zinc oxide, urea and water as the mole ratio of zinc oxide and urea is 0.001-0.9 and that of zinc oxide and water is 0.01-1000 as reserve material, 2) blending the material containing zinc oxide, urea and water, grinding the mixture uniformly and obtaining slurry, 3) heating to form colloid: heating the slurry obtained from the step 2) at the temperature between 121-340 DEG C to obtain transparent colloid, 4) employing one of the following two methods to obtain zinc oxide material: a ) heat decompositing filter residue by hydrolysis to obtain zinc oxide material, b ) heat decomposition: heating the colliod obtained from step 3) to the temperature between 420-800 DEG C to obtain zinc oxide material. The method has the advantages of low cost, low reaction temperature and capability of catalyzing urea to heat decomposite to obtain cyanamide. The obtained product is characterized that graininess is small, adulteration is uniform and the product is larger than the specific surface area.

Description

technical field [0001] The invention relates to a preparation method of zinc oxide material. Background technique [0002] Due to its small grain size and large specific surface area, nano-ZnO has unique surface effects, volume effects, long-lasting effects, and excellent photoactivity, electrical activity, sintering activity, and catalytic activity. It can be used to manufacture gas sensors, phosphors, and ultraviolet shielding. materials, varistors, image recording materials, piezoelectric materials, varistors, high-efficiency catalysts, magnetic materials, ceramic materials, cosmetics and medical materials. It also has application prospects in rubber industry, dye ink and other fields. Therefore, the preparation of nano-zinc oxide has become one of the research hotspots in the field of material preparation. [0003] At present, there are many methods for preparing nano zinc oxide powder, such as sol-gel method (Sol-Gel), homogeneous precipitation method, hydrothermal me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
Inventor 张勇张安林余珊珊
Owner WUHAN INSTITUTE OF TECHNOLOGY
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