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Lotus leaf surface-imitated super-hydrophobic film and preparation method thereof

A super-hydrophobic, lotus leaf-like technology, used in coatings, polyurea/polyurethane coatings, etc., can solve the problems of limiting the wide application of micro/nano coatings, inability to form films in large areas, and complicated preparation processes, and achieve stable storage. Good performance, low cost and good mechanical properties

Inactive Publication Date: 2011-06-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these surface treatments generally need to be carried out under strict laboratory equipment and process control conditions, or can only be realized on special substrates (such as carbon nanotube arrays), and the preparation process is complicated and costly, and it is impossible to form large-scale films. Thus limiting the wide application of micro / nano coatings in the production field

Method used

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  • Lotus leaf surface-imitated super-hydrophobic film and preparation method thereof
  • Lotus leaf surface-imitated super-hydrophobic film and preparation method thereof
  • Lotus leaf surface-imitated super-hydrophobic film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] a kind of like figure 1 The superhydrophobic film imitating the surface of the lotus leaf of the present invention is shown, the superhydrophobic film includes a base film of low surface energy material and a micro / nano structure formed on the base film. The base film is a compound of organofluorine modified acrylate and organosilicon modified polyurethane. The micro / nano structure includes micron-sized particles uniformly distributed on the base film (in this embodiment, the average particle diameter of the micron-sized particles is about 3 μm, see figure 1 ) and the nanoscale papillae grown on the micron-scale particles (the average particle diameter of the nanoscale papillae in this embodiment is about 40nm, see figure 1 ), the micron-sized particles and nano-sized papillae are made of modified Fe 3 o4 aggregates of nanoparticles. In the superhydrophobic film imitating the lotus leaf surface of the present embodiment, the modified Fe 3 o 4 The mass ratio of nano...

Embodiment 2

[0038] A super-hydrophobic film imitating the surface of a lotus leaf of the present invention, the super-hydrophobic film comprises a base film of low surface energy material and a micro / nano structure formed on the base film. The base film is a compound of organofluorine modified acrylate and organosilicon modified polyurethane. The micro / nano structure includes micron-scale particles uniformly distributed on the basement membrane (average particle diameter is about 5 μm) and nano-scale papillae (average particle diameter is about 40 nm) grown on the micron-scale particles, the micron-scale particles and Nanoscale papillae are made of modified SiO 2 aggregates of nanoparticles. In the superhydrophobic film imitating the lotus leaf surface of the present embodiment, the modified SiO 2 The mass ratio of nanoparticles to base film is 0.1:1.

[0039] The superhydrophobic film on the imitation lotus leaf surface of the present embodiment is specifically prepared through the fo...

Embodiment 3

[0047] A super-hydrophobic film imitating the surface of a lotus leaf of the present invention, the super-hydrophobic film comprises a base film of low surface energy material and a micro / nano structure formed on the base film. The base film is a compound of organofluorine modified acrylate and organosilicon modified polyurethane. The micro / nano structure includes micron-scale particles uniformly distributed on the basement membrane (average particle diameter is about 5 μm) and nano-scale papillae (average particle diameter is about 40 nm) grown on the micron-scale particles, the micron-scale particles and Nanoscale papillae are made of modified TiO 2 aggregates of nanoparticles. In the superhydrophobic film imitating the lotus leaf surface of the present embodiment, the modified TiO 2 The mass ratio of nanoparticles to base film is 0.2:1.

[0048] The superhydrophobic film on the imitation lotus leaf surface of the present embodiment is specifically prepared through the fo...

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Abstract

The invention discloses a lotus leaf surface-imitated super-hydrophobic film and a preparation method thereof. The super-hydrophobic film comprises a base membrane made of a low surface energy material and a micro / nano structure formed on the base membrane, wherein the micro / nano structure comprises micron particles evenly distributed on the base membrane and nano mastoids grown on the micron particles. The preparation method comprises the following steps: firstly, dispersing oxide nano particles in a modified solution added with a coupling agent, stirring, separating and drying, thus obtaining modified oxide nano particles; then adding an initiator in the modified oxide nano particle solution, heating, and simultaneously dropwise adding a mixed monomer solution of fluorine-containing acrylate monomers and hydroxyl-containing acrylate monomers; mixing with organic silicon modified polyurethane, and adding a catalyst so as to obtain a nano composite solution after reaction; and finally, filming by utilizing the diluted nano composite solution, and drying so as to obtain the lotus leaf surface-imitated super-hydrophobic film. The film discloses by the invention has the advantages of good self-cleaning effect, good mechanical property and stability, low cost, environmental friendliness and the like.

Description

technical field [0001] The invention relates to a composite organic film and a preparation method thereof, in particular to a superhydrophobic film and a preparation method thereof. Background technique [0002] In nature, the surface of lotus leaf has a unique self-cleaning function, which is determined by its surface microstructure and chemical substances with low surface energy. From the SEM image of the surface of the lotus leaf, it can be seen that the surface is composed of many papillae with a thickness of 5 μm to 9 μm, and each papillae has a nanoscale secondary structure. The superhydrophobic micro-nano secondary structure (referred to as micro / nano structure) on the surface of lotus leaf includes: the surface cell morphology of lotus leaf has a papillae structure with micro / nano dual scale, and the surface micro / nano structure contains hydrophobic wax plastid. With the recognition of the micro / nano structure characteristics and mechanism of superhydrophobic self-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08K9/06C08K3/36C08K3/22C08G18/77C08G18/62C08F220/28C08F220/14C08F220/18C08F212/08C08F220/22C08F2/44C08J5/18C09D175/04C09D7/12C09D5/00
Inventor 王建方田小洲钱斯文吴文健王璟赖媛媛
Owner NAT UNIV OF DEFENSE TECH
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