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Method for preparing polymer superhydrophobic surface by virtue of hydrophobic nanoparticle spontaneous deposition

A super-hydrophobic surface and nano-particle technology, applied in the field of preparation of polymer super-hydrophobic surface, can solve the problems of high investment threshold for precision coating equipment, increased film haze, complex coating process, etc., and achieves good repeatability/continuity. , good wear resistance, environmentally friendly effect

Inactive Publication Date: 2018-09-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chen Zao et al prepared SiO on the air plasma modified ethylene terephthalate (PET) film by dipping and pulling coating process. 2 Coating, and finally using perfluorodecyltrichlorosilane (FAS) to modify its surface to form a transparent superhydrophobic surface (Modern Plastics Processing Applications, 2016,28(3):12-15), but the investment threshold for precision coating equipment is high , the coating process is complex
Following the hot pressing-pulling micro-molding process (200910098094.X), a super-hydrophobic film with a nano-scale rough structure on the surface is prepared, which is expected to be more transparent, but the nano-rough mold is difficult to prepare, and even if it can be prepared, the life of the mold may be short. Very short, in addition, the microfibers formed by the drawing process are likely to cause the haze of the film to increase or even no longer transparent

Method used

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  • Method for preparing polymer superhydrophobic surface by virtue of hydrophobic nanoparticle spontaneous deposition
  • Method for preparing polymer superhydrophobic surface by virtue of hydrophobic nanoparticle spontaneous deposition
  • Method for preparing polymer superhydrophobic surface by virtue of hydrophobic nanoparticle spontaneous deposition

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 0.5g of hydrophobic white carbon black (nano silica grafted with methyl group) (Evonik Industries AG, R812s, average particle size 20-30nm, the same below) was added to 37g of ethanol, magnetically stirred for 1h, and ultrasonicated for 30min to obtain hydrophobic white carbon black. Carbon black / ethanol suspension, spray it evenly on the surface of LDPE film (about 0.5mm thick, the same below), dry it at room temperature and then put it in an oven at 120°C for 20min, cool it to room temperature and rinse it thoroughly with ethanol, N 2 Blow dry to obtain LDPE-SiO 2 membrane.

[0044] The film has good transparency, and the surface morphology is as follows: figure 1 As shown in A / B, the static contact angle and rolling angle of water droplets are 154.8° and 2.8°, respectively, showing typical superhydrophobic properties ( figure 1 B inset). The LDPE superhydrophobic membrane that makes utilizes self-made device (such as figure 2 ) to test their water resistance ( ...

Embodiment 2

[0048] Others are the same as in Example 1, changing the oven temperature to 130°C. The surface morphology of the resulting LDPE film is shown in figure 1 C / D. The LDPE film exhibits typical superhydrophobic properties (the static contact angle of water is 154.2°, and the rolling angle is 3.0°).

Embodiment 3

[0050] Others are the same as in Example 1, changing the oven temperature to 140°C. The surface morphology of the resulting LDPE film is shown in figure 1 E / F. The LDPE film exhibits typical superhydrophobic properties (the static contact angle of water is 153.8°, and the rolling angle is 3.2°).

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Abstract

The invention discloses a method for preparing a polymer superhydrophobic surface by virtue of hydrophobic nano particle spontaneous deposition. The method comprises the following steps: uniformly spraying hydrophobic nanoparticles onto a polymer film-shaped melt surface, so that the hydrophobic nanoparticles can be spontaneously deposited inside the melt surface in a short time at a polymer melting point or the viscous flow temperature or above, forming an insert structure, and cooling, thus obtaining the polymer superhydrophobic film. The polymer superhydrophobic film provided by the invention has the advantages of stable hydrophobic performance, water impact resistance, good friction resistance and the like. The preparation method of the invention is highly matched with the existing polymer casting and spraying process, so that only a row of hydrophobic nanoparticle spraying apparatuses is required nearby a T-shaped machine head of the casting or spraying device; and moreover, the cost is low, the repetition / continuity is good, environmental protection is achieved, and the method is suitable for mass production and wide in market prospect.

Description

(1) Technical field [0001] The invention relates to a method for preparing a superhydrophobic surface of a polymer, specifically refers to the spontaneous deposition of hydrophobic nanoparticles on the surface of a polymer melt to form a mosaic structure and realize the superhydrophobicity of the polymer surface. (2) Background technology [0002] A superhydrophobic surface refers to a surface with a static contact angle of water droplets ≥ 150° and a rolling angle ≤ 10°. It has important applications in the fields of rainwater self-cleaning, anti-freezing rain, and fluid drag reduction. The large-area and low-cost construction of superhydrophobic surfaces, especially transparent superhydrophobic plastic films, has always been a difficult point in industrialization. In previous studies, we have invented various methods for constructing polymer superhydrophobic surfaces / films in large areas (200910096817.2, 200910098056.4, 200910098094.X, 201010109225.2, 201010203392.3), but ...

Claims

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Application Information

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IPC IPC(8): B29C67/00
CPCB29C67/0011
Inventor 冯杰张伟成张静
Owner ZHEJIANG UNIV OF TECH
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