A novel composite coating mesh film for oil-water separation

Abstract

Polytetrafluoroethylene-polyphenylene sulfide composite coating mesh film was successfully prepared by a simple layered transitional spray-plasticizing method on a stainless steel mesh. It shows super-hydrophobic and super-oleophilic properties. The contact angle of this mesh film is 156.3° for water, and close to 0° for diesel oil and kerosene. The contact angle hysteresis of water on the mesh film is 4.3°. The adhesive force between the film and substrate is grade 0, the flexibility is 1 mm and the pencil hardness is 4H. An oil-water separation test was carried out for oil-contaminated water in a six-stage super-hydrophobic film separator. The oil removal rate can reach about 99%.

Key words： super-hydrophobic; super-oleophilic; composite coating; mesh film; separation of oil and water

Acknowledgements

We are grateful for the financial support from the Science & Technology Foundation of the Liaoning Province (No. 20072190), Liaoning China.

References

1 Neinhuis C, Barthlott W. Characterization and distribution of water-repellent, self-cleaning plant surfaces. Annals of Botany, 1997, 79: 667-677

2 Gao X F, Jiang L. Water-repellent legs of water striders. Nature, 2004, 432: 36-36

3 Lee W, Jin M K, Yoo W C, Lee J K. Nanostructuring of a polymeric substrate with well-defined nanometer-scale topography and tailored surface wettability. Langmuir, 2004, 20: 7665-7669

4 Jiang L. Nanostructured materials with superhydrophobic surface from nature to biomimesis. Chemical Industry and Engineering Progress, 2003, 22(12): 1258-1262

5 Bhagat S D, Oh C S, Kim Y H, AhnY S, Yeo J G. Methyltrimethoxysilane based monolithic silica aerogels via ambient pressure drying. Microporous and Mesoporous Materials, 2007, 100: 350-355

6 Rao A V, Bhagat S D, Hirashima H, Pajonk G M. Synthesis of flexible silica aerogels using methyltrimethoxysilane (MTMS) precursor. Journal of Colloid and Interface Science, 2006(300): 279-285

7 Lau K K S, Gleason K K. Particle functionalization and encapsulation by initiated chemical vapor deposition (iCVD). Surface and Coatings Technology, 2007, 201: 9189-9194

8 Wang Q J, Quan Y W, Zhang J S, Chen Q M. Preparation of super water-repellent membrane by radiation-induced copolymerization. Surface & Coatings Technology, 2006, 200: 5493-5497

9 Gao X F, Yao X, Jiang L. Effects of rugged nanoprotrusions on the surface hydrophobicity and water adhesion of anisotropic micropatterns. Langmuir, 2007, 23: 4886-4891

10 Pozzato A, Zilio S D, Fois G. Superhydrophobic surfaces fabricated by nanoimprint lithography. Microelectronic Engineering, 2006, 83: 884-888

11 Qian B T, Shen Z Q. Fabrication of Superhydrophobic Surfaces by Dislocation-Selective Chemical Etching on Aluminum, Copper, and Zinc Substrates. Langmuir, 2005, 21: 9007-9009

12 Li Y F, Yu Z J, Yu Y F, Sun Y F. Preparation of super-hydrophobic surface on brass by chemical etching. Journal of Chemical Industry and Engineering (China), 2007, 58(12): 3117-3121

13 Shirtcliffe N J, McHale G, Newton M I, Perry C C. Wetting and wetting transitions on copper-based super-hydrophobic surfaces. Langmuir, 2005, 21: 937-943

14 Fresnais J, Chapel J P, Poncin-Epaillard F. Synthesis of transparent superhydrophobic polyethylene surfaces. Surface & Coatings Technology, 2006, 200: 5296-5305

15 Kim S H, Kim J H, Kang B K, Uhm H S. Superhydrophobic CF_xcoating via in-line atmospheric RF plasma of He-CF₄-H₂. Langmuir, 2005, 21: 12213-12217

16 Satyaprasad A, Jain V, Nema S K. Deposition of superhydrophobic nanostructured teflon-like coating using expanding plasma arc. Applied Surface Science, 2007, 253: 5462-5466

17 Li J H, Hou C S, Yu Z L, Xie M J, Yan Y G, Chen Y R, Chen H. Study on interface of polyphenylene sulfide/metal. Polymer Materials Science and Engineering, 1998, 14(3): 94-99

18 Wenzel R N. Resistance of solid surfaces to wetting by water. Ind Eng Chem, 1936, 28: 988-994