Preparation method of superfine zinc oxide powder

A technology of zinc oxide powder and starch, which is applied in the field of preparation of ultrafine zinc oxide powder, can solve problems such as inconvenient operation, compression feeding, retention, etc., and achieves the effects of simple preparation method, less impurities in the product, and low manufacturing cost

Pending Publication Date: 2021-07-23
JIANGSU BEILIDE NOVEL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this method is that it will not introduce impurity ions, and the product has high purity; the disadvantage is that the source of high-purity carbon dioxide gas is not only inconvenient, but also needs to be compressed.
[0009] Secondly, there are some research papers reporting other preparation methods of zinc oxide, such as solid-p

Method used

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  • Preparation method of superfine zinc oxide powder
  • Preparation method of superfine zinc oxide powder
  • Preparation method of superfine zinc oxide powder

Examples

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Effect test

Embodiment 1

[0028] The invention discloses a preparation method of superfine zinc oxide powder, which comprises the following steps: the first step is to prepare a suspension, and the composition of the suspension is 5-10% of starch, 0.2-0.8% of amylase, and the rest is water; in the second step, put the suspension prepared in the first step into an autoclave and heat it up to 60-80°C, and then stir for 20-50 minutes; in the third step, add crude oil to the autoclave in the second step Granular zinc oxide powder 5-15%, make the concentration reach 10%, and then cool down to below 0°C, the fourth step, pass ozone into the suspension in the autoclave through the ozone generator, and wait until the ozone concentration reaches 0.5-10mg / L, then feed oxygen into it to make the pressure reach 30atm, close the valve, then stir slowly until the temperature of the autoclave reaches 80°C, and stir again for 6-8 hours; the fifth step, after the fourth step stirring reaction is completed , filter the...

Embodiment 2

[0030] The invention discloses a preparation method of ultrafine zinc oxide powder, which comprises the following steps: the first step is to prepare a suspension, and the composition of the suspension is 5% of starch, 0.2% of amylase and the rest is water; the second The first step is to put the suspension prepared in the first step into an autoclave and heat it up to 60°C, and then stir for 20 minutes; the third step is to add 5% of coarse particle zinc oxide powder to the autoclave in the second step to make The concentration reaches 10%, and then it is cooled to below 0°C. In the fourth step, ozone is introduced into the suspension in the autoclave through an ozone generator. After the ozone concentration reaches 2.5mg / L, oxygen is introduced into it to make The pressure reaches 30atm, close the valve, then stir slowly until the temperature of the autoclave reaches 80°C, and stir again for 6 hours; in the fifth step, after the stirring reaction in the fourth step is complet...

Embodiment 3

[0032] The invention discloses a preparation method of ultrafine zinc oxide powder, which comprises the following steps: the first step is to prepare a suspension, and the composition of the suspension is 10% of starch, 0.8% of amylase and the rest is water; the second The first step is to put the suspension prepared in the first step into an autoclave and heat it up to 80°C, and then stir for 50 minutes; the third step is to add 15% of coarse particle zinc oxide powder to the autoclave in the second step to make The concentration reaches 10%, and then it is cooled to below 0°C. In the fourth step, ozone is introduced into the suspension in the autoclave through an ozone generator. After the ozone concentration reaches 10mg / L, oxygen is introduced into it to make it When the pressure reaches 30atm, close the valve, then stir slowly until the temperature of the autoclave reaches 80°C, and stir again for 8 hours; in the fifth step, after the stirring reaction in the fourth step is ...

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Abstract

The invention discloses a preparation method of superfine zinc oxide powder, which comprises the following steps: step 1, preparing a suspension which comprises the following components: 5-10% of starch, 0.2-0.8% of amylase and the balance of water; step 2, putting the suspension prepared in the step 1 into a pressure kettle, heating to 60-80 DEG C, and then stirring for 20-50 minutes; step 3, adding 5-15% of coarse-particle zinc oxide powder into a pressure kettle in the step 2, enabling the concentration of the coarse-particle zinc oxide powder to reach 10%, and then cooling the coarse-particle zinc oxide powder to be below 0 DEG C; and step 4,introducing ozone into the suspension in the pressure kettle through an ozone generator.The preparation method is simple and convenient to operate, and compared with a traditional precipitation method for preparing superfine zinc oxide, a large amount of waste water and other solid waste are not generated, the used starch is natural, ozone can be obtained through an ozone generator, other chemical raw materials are not needed, and the particle size of the obtained product is controllable.

Description

technical field [0001] The invention relates to a preparation method of zinc oxide powder, in particular to a preparation method of ultrafine zinc oxide powder. Background technique [0002] Zinc oxide powder is a commonly used white metal oxide powder. Zinc oxide has good whiteness, high refractive index, excellent hiding properties, thermal conductivity, antibacterial and anti-ultraviolet properties, and is widely used in technical fields such as rubber, ceramics, power electronics, national defense, textiles, and cosmetics. Its preparation method is divided into three types: Classes: direct method (American method), indirect method (French method) and wet chemical method. [0003] Direct cause of law first appeared in the United States, also known as "American law". Its original zinc is reduced by carbon-containing substances mainly coal at high temperatures greater than 1000 °C. After that, the zinc vapor and carbon monoxide contained in the high-temperature combustio...

Claims

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Application Information

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IPC IPC(8): C01G9/02B82Y40/00
CPCC01G9/02B82Y40/00C01P2004/64C01P2004/62
Inventor 陆毅陈洪龄吴雄伟陈建邦
Owner JIANGSU BEILIDE NOVEL MATERIALS
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