Super-hydrophobic filter screen and preparation method thereof

A filter screen and super-hydrophobic technology, applied in the field of nanomaterials, can solve the problems of unsatisfactory high temperature resistance, corrosion resistance and super-hydrophobic performance, and can not meet the needs of use, achieve excellent super-hydrophobic performance, reduce energy consumption and production costs, The effect of lowering the reaction temperature

Active Publication Date: 2020-08-25
ROCKET FORCE UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing superhydrophobic filter screens are not ideal for high temperature resistance, corrosion resistance and superhydrophobic performance, and cannot meet people's needs for use.

Method used

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  • Super-hydrophobic filter screen and preparation method thereof
  • Super-hydrophobic filter screen and preparation method thereof
  • Super-hydrophobic filter screen and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0039] The preparation process of superhydrophobic filter net is:

[0040] (1) Mix boron oxide and magnesium powder at a molar ratio of 1:1.5 to 1:2.5, and ball mill in a planetary ball mill for more than 0.5 hours under the protection of nitrogen to obtain a solid powder with a particle size of 2 to 10 microns, boron nitride The molecular formula is BN.

[0041] (2) Place the solid powder obtained in step (1) in a square porcelain boat, place a 30mm×30mm metal mesh at the center of the top of the porcelain boat, and place the porcelain boat in a tubular atmosphere protection annealing furnace. Put an inert protective atmosphere into the furnace tube of the tubular atmosphere protection annealing furnace, start heating from normal temperature under the protection of 20-200ml / min inert protective atmosphere, the heating rate is 5-80°C / min, and the temperature rises to 300-500°C Close the inert protective atmosphere valve at the same time, pass high-purity ammonia gas into the ...

Embodiment 1

[0044] (1) Boron oxide and metal magnesium powder are mixed according to the molar ratio of 1:2, placed in a ball mill tank, and under the protection of nitrogen, adopt the mode of forward and reverse alternating operation, and ball mill for 4 hours to obtain a uniformly mixed solid powder, granular The diameter is about 2 to 10 microns.

[0045] (2) Place the solid powder obtained in step (1) in a square porcelain boat of 60mm×30mm, place a piece of metal mesh of 30mm×30mm on the porcelain boat, and make it in the middle position, at 20ml / min Under the protection of argon, start to heat up from normal temperature, and the heating rate is 10°C / min. When the temperature rises to 300°C, close the argon valve, feed high-purity ammonia gas, with a flow rate of 150ml / min, continue to heat up to 1225°C, and keep warm for 8 hours. , and then stop feeding high-purity ammonia gas, then naturally cool down to room temperature under an inert protective atmosphere, and deposit a white sub...

Embodiment 2

[0052] Change the reaction temperature of step (2) in Example 1 to 1250° C., and other operations are the same as in Example 1, and the product obtained is the same as in Example 1.

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Abstract

The invention discloses a super-hydrophobic filter screen and a preparation method thereof. The super-hydrophobic filter screen comprises a metal screen, wherein a plurality of boron nitride nanotubesgrow on the surface of the metal screen; the roots of the boron nitride nanotubes are perpendicular to the surface of the metal screen; the diameters of the roots of the boron nitride nanotubes is larger than the diameters of the tops of the boron nitride nanotubes; and the parts, close to the tops, of the boron nitride nanotubes are conical, and the other parts of the boron nitride nanotubes arecylindrical. The method comprises the following steps: mixing boron oxide powder and magnesium powder according to a molar ratio of (1: 1.5)-(1: 2.5), placing the obtained mixture in a container, placing a metal net at the central position of the upper part of the container, and placing the container in a tubular atmosphere protection annealing furnace; and introducing inert protective atmosphereinto a furnace tube of the tubular atmosphere protection annealing furnace; and when the temperature rises to 300-500 DEG C, stopping introducing argon, introducing high-purity ammonia gas, continuing heating to 1200-1300 DEG C, keeping the temperature for 2-12 hours, then stopping introducing the high-purity ammonia gas, introducing inert protective atmosphere, and carrying out natural cooling to room temperature to obtain the high-temperature-resistant corrosion-resistant super-hydrophobic filter screen.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a superhydrophobic filter net and a preparation method thereof. Background technique [0002] Oily wastewater is a common wastewater produced by industries such as petrochemical, food, textile, leather and metallurgy. These wastewater usually contain insoluble oily substances and soluble harmful pollutants. Direct discharge will pollute rivers and water sources. Indirect air, soil pollution, serious harm to the natural environment and human health. Water pollution is a major global problem, and how to purify and separate useful water from sewage is a challenge facing the world today. The traditional treatment methods of oily wastewater mainly include gravity and mechanical separation method, air flotation method, adsorption method, flocculation method, microbial method and membrane separation method. Among them, the membrane separation method is widely used, but in practical ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/12C01B21/064
CPCB01D39/12B01D2239/0428C01B21/064
Inventor 李艳娇刘延飞秦忠宝郭剑锋侯立安
Owner ROCKET FORCE UNIV OF ENG
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