Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Preparation method for porous superhydrophobic membrane with structural gradient changes

A structural gradient and super-hydrophobic technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of surface particle agglomeration, increase mass transfer resistance, high requirements for the selection of bonding layer materials and properties, and achieve wide application Prospect, simple preparation method, effect of increasing porosity

Active Publication Date: 2019-08-06
DALIAN UNIV OF TECH
View PDF9 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has high requirements for the selection of materials and properties of the bonding layer, and the uniformity of the bonded micron and nanostructures is difficult to control, which can easily lead to agglomeration of surface particles, which will increase the mass transfer resistance when used in the separation process, making it difficult to achieve efficient separation.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing a porous super-hydrophobic membrane with a structural gradient change, the steps are as follows:

[0026] (1) Use plasma technology to modify the base film to increase the porosity of the film; fix the base film on the supporting plate of the plasma surface treatment instrument, adjust the supporting plate to be parallel to the plasma generator, and turn on the plasma surface treatment Switch on the instrument, select the automatic mode, and set the process parameters, the radio frequency power is 50W, the gas flow rate is 200cc / min, the base film treatment time is 3min, the vacuum degree is 60Pa, and ammonia gas is introduced, and finally click the "Run" button to run Plasma generating device, complete the treatment of increasing the porosity of the PP base film, and then seal it for storage, and its porosity increases from 5.5% of the base film to 8.68%;

[0027] (2) Adopt surface coating method to prepare the composite film of micron-scale stru...

Embodiment 2

[0031] A method for preparing a porous superhydrophobic membrane with a gradient structure, the steps are as follows:

[0032] (1) Use plasma technology to modify the base film to increase the porosity of the film; fix the base film on the supporting plate of the plasma surface treatment instrument, adjust the supporting plate to be parallel to the plasma generator, and turn on the plasma surface treatment Switch the instrument, select the automatic mode, and set the process parameters, the radio frequency power is 100W, the gas flow rate is 300cc / min, the base film treatment time is 3min, the vacuum degree is 80Pa, and the mixed gas of ammonia and air is introduced, and finally click "Run ” button, run the plasma generating device, complete the process of increasing the porosity of the PP base film, and then seal it for storage, and its porosity increases from 5.5% of the base film to 11.99%;

[0033] (2) Adopt the surface coating method to prepare the composite film of micro...

Embodiment 3

[0037] A method for preparing a porous superhydrophobic membrane with a gradient structure, the steps are as follows:

[0038] (1) Use plasma technology to modify the base film to increase the porosity of the film; fix the base film on the supporting plate of the plasma surface treatment instrument, adjust the supporting plate to be parallel to the plasma generator, and turn on the plasma surface treatment Switch the instrument, select the automatic mode, and set the process parameters, the radio frequency power is 150W, the gas flow rate is 400cc / min, the base film treatment time is 3min, the vacuum degree is 120Pa, and the mixed gas of ammonia and nitrogen is introduced, and finally click "Run " button to run the plasma generating device, complete the process of increasing the porosity of the PP base film, and then seal it for storage, and its porosity increases from 5.5% of the base film to 15.29%;

[0039] (2) Adopt surface coating method to prepare the composite film of m...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of membrane science and provides a preparation method for a porous superhydrophobic membrane with structural gradient changes. The preparation method includes the following steps: utilizing a plasma technology to modify a basement membrane so that the porosity of the membrane can be increased; respectively adopting a coating method and an in-situ sol-gel method to prepare composite membranes with gradient changes of micron and nanoscale structures; and utilizing the surface chemical reaction of a low surface energy substance to obtain a superhydrophobic membrane through modification. The method utilizes plasma treatment to increase the surface porosity of the basement membrane; the basement membrane is coated with micron-sized particles; nanoscale particles can be generated on the surface of the basement membrane and the micron-sized particles in-situ; and the prepared superhydrophobic membrane can have characteristics of porousness and structural gradient changes by regulating the sizes and load capacity of the microparticles and nanoparticles on the surface of the basement membrane. The preparation method solves the problem of membranehole blockage caused by the direct coating method; new ideas of constructing multi-level rough structures can also be provided; and the preparation method is simple and low in cost, so that the preparation method has wide application prospects in the field of membrane separation.

Description

technical field [0001] The invention relates to a method for preparing a porous super-hydrophobic membrane with a gradient structure, and belongs to the field of membrane science and technology. Background technique [0002] Superhydrophobic membrane refers to the membrane material with surface static contact angle greater than 150°, which has excellent anti-wetting and anti-fouling properties. Superhydrophobic membranes are playing an increasingly important role in the fields of self-cleaning and membrane separation, and their preparation methods have become a research hotspot in the field of membrane science. Lotus leaves and butterfly wings in nature all exhibit excellent super-hydrophobic properties. Studies have found that the key to constructing super-hydrophobic films is to increase surface roughness while reducing surface energy. At present, the common preparation methods of superhydrophobic membranes mainly construct rough structures by coating inorganic nanopartic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D67/00B01D69/12B01D71/02B01D71/26B01D71/30B01D71/34B01D71/36B01D71/38B01D71/48B01D71/64
CPCB01D61/364B01D67/0081B01D69/12B01D71/027B01D71/26B01D71/30B01D71/34B01D71/36B01D71/38B01D71/48B01D71/64B01D2325/38
Inventor 姜晓滨邵钰珊贺高红佟哲名肖武李祥村吴雪梅
Owner DALIAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products