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Preparation method for transparent super hydrophobic polymer thin films

A polymer film, super-hydrophobic technology, applied in the field of transparent super-hydrophobic polymer film, can solve the problems of long cycle and harsh film-forming conditions, and achieve the effects of simple method, low price and wide applicability

Active Publication Date: 2017-12-26
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the film forming conditions are relatively harsh and the cycle is long

Method used

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  • Preparation method for transparent super hydrophobic polymer thin films
  • Preparation method for transparent super hydrophobic polymer thin films
  • Preparation method for transparent super hydrophobic polymer thin films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take a tape-cast polypropylene (PP) film (thickness 20 μm), the front and back sides are bonded with two polyimide films (PI) of the same size to form a sandwich structure, and the PI-PP-PI film is clamped with a clip. Four sides, in order to keep the stability of film sandwich structure.Put it in the autoclave, in the pressure is 18MPa, the temperature is the supercritical CO of 140 ℃ 2 Soak in the middle for 30min, and then reduce the pressure quickly (pressure release rate: 6MPa / s), foam the polypropylene film, and form such as on the surface of the polypropylene film figure 1 A shows the nanomastoid structure. The water contact angle test shows that the contact angle reaches 155° after foaming, figure 1 B shows the situation that the film is transparent and super-hydrophobic. The visible light transmittance of the film measured by a UV-visible spectrophotometer reaches 76%, which is 86.4% of the light transmittance of the original film. The tensile property of the...

Embodiment 2

[0029] Take a biaxially stretched polypropylene film (thickness 30 μm), attach two PI films of the same size on the front and back sides to form a sandwich structure, and clamp the four sides of the PI film with clips to keep the PI film-PP film-PI Stabilization of thin film sandwich structures. Put it in a high-pressure reactor, at a pressure of 18MPa and a temperature of 145°C in supercritical CO 2 Immerse in the medium for 120min, and then quickly reduce the pressure (pressure release rate: 5MPa / s), foam the polypropylene film, and form on the surface such as figure 2 A shows the nanotrench structure. The water contact angle test shows that the contact angle reaches 158° after foaming, figure 2 B shows the situation that the film is transparent and super-hydrophobic. The visible light transmittance of the film is 88% as measured by the UV-Vis spectrophotometer, which is 97.7% of the original film. The tensile property of the polypropylene film is 43.6MPa, which is 96% ...

Embodiment 3

[0031] Take a tape-cast polyethylene terephthalate film (PET, thickness 100 μm), attach the front and back sides to two PI films of the same size to form a sandwich structure, clamp the four sides of the PI film with clips, and Keep the sandwich structure of PI film-PET film-PI film stable. Put it in a high-pressure reactor, at a pressure of 25MPa and a temperature of 160°C supercritical CO 2 Immerse in the medium for 180min, and then quickly reduce the pressure (pressure release rate: 6MPa / s), foam the polypropylene film, and form on the surface such as image 3 The nanomastoid structure of A. The water contact angle test shows that the contact angle reaches 153° after foaming, image 3 The film shown in B is transparent and super-hydrophobic. The visible light transmittance of the film measured by an ultraviolet-visible spectrophotometer reaches 82%, and the light transmittance of the original film remains 93.4%. The tensile property of the PET film is 198MPa, which is 10...

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Abstract

The invention provides a preparation method for transparent super hydrophobic polymer thin films; the transparent polymer thin films are prepared by tape casting or directional stretching and other molding processes, a special structure of nano mastoids and grooves is formed on the surface of the polymer thin films by a supercritical CO2 foaming method, and super hydrophobicity and low reflection are achieved while the transparency is kept. The method is suitable for various thermoplastic polymer thin films, and all the thermoplastic transparent polymer thin films with various thickness and areas can be made to have super hydrophobic surfaces by the method. By adjusting supercritical CO2 foaming technological conditions including the temperature, the pressure, the soaking time and the pressure relief rate, and with utilization of a covering object to limit the gas diffusion rate of the thin film surface, the nano structure (the nano mastoid size, the groove depth and width and the like) of the thin film surface can be adjusted conveniently, and thus the super hydrophobicity is achieved while the transparency of the polymer thin films is kept.

Description

technical field [0001] The invention relates to the field of polymer functional materials, in particular, to a method using supercritical CO 2 Foaming is a method for preparing transparent superhydrophobic polymer films with special nanostructures on the surface. Background technique [0002] In nature, the surfaces of animals and plants have rich microstructures, which make them have different wetting properties and exhibit special optical properties. In recent years, biomimetic preparation of similar surface microstructures to obtain unique surface properties has attracted extensive attention from researchers. For example, cicada wings, whose surface contains nanopapillae array structures, make them superhydrophobic and transparent to visible light. A polyethylene terephthalate film with a similar surface microstructure to that of a cicada wing has been prepared by using a complex plasma etching process combined with chemical modification. The film is not only transpare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08J5/18C08L23/12C08L67/02C08L23/06C08L33/12C08L25/06C08L77/00
CPCC08J5/18C08J9/122C08J2203/06C08J2203/08C08J2323/06C08J2323/12C08J2325/06C08J2333/12C08J2367/02C08J2377/00
Inventor 邱守季谢普容敏智章明秋
Owner SUN YAT SEN UNIV
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