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Method of depositing fluorinated layer from precursor monomer

A technology of fluorinated and fluorinated compounds, which can be applied to devices, coatings, and special surfaces that coat liquids on surfaces, and can solve problems such as reducing surface hydrophobicity

Inactive Publication Date: 2010-09-01
UNIV LIBRE DE BRUXELIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this approach is that it requires the use of sufficiently reactive compounds
However, most of these reactive compounds have the following disadvantages: directly bearing hydrophilic polar groups or reacting with atmospheric oxygen or moisture to generate polar groups in the long run, thereby reducing the hydrophobicity of the surface
These constraints limit the deposition of fluorinated layers to high value-added products

Method used

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  • Method of depositing fluorinated layer from precursor monomer
  • Method of depositing fluorinated layer from precursor monomer
  • Method of depositing fluorinated layer from precursor monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1 shows the deposition of perfluorohexane on PVC, which was carried out in the post-discharge region under the following conditions:

[0058] Cut a sample 3 (Solvay brand PVC film) of 4 cm × 4 cm, clean it with methanol and isooctane and place it in a low-temperature plasma torch operated under normal pressure ( figure 1 ) (dielectric barrier discharge) outlet (at 0.05cm). The fluorinated monomer (perfluorohexane) was placed in a glass (Pyrex) bubbler immersed in a Dewar container containing a mixture of acetone and dry ice. The temperature of the mixture (and thus the temperature of the monomers) was about -80°C. The vapor pressure of perfluorohexane at this temperature is about 1.2 mbar. The bubbler was then fed with a flow of argon with an initial overpressure of 1.375 bar. Argon / perfluorohexane gas mixture 1 is brought into the torch. Plasma was initiated for 1 minute at a voltage of 3,200 volts and a frequency of 16 kHz.

Embodiment 2

[0060] Example 2 shows the deposition of perfluorohexane on PVC produced in the dielectric barrier discharge region under the following conditions.

[0061] The sample was attached to the inside of the outer electrode 9 of the cylindrical dielectric barrier discharge region. The "hot" electrode 8, to which the voltage is applied, is an inner electrode covered with an alumina cup. High alumina cement provides sealing ( figure 2 ).

[0062] The fluorinated monomer was brought into the discharge region as in Example 1. Subsequently, a treatment (treatment in the discharge area) was carried out at a voltage of 3,000 V and a frequency of 20 kHz for 1 minute.

[0063] It is confirmed by X-ray photoelectron spectroscopy that there is indeed a fluorinated layer on the surface of the PVC film. image 3 and 4 The spectrum in , shows a full view and a zoom-in view of the carbon region. The fluorine peak located at 689eV clearly identifies CF 2 The presence of fluorine in the grou...

Embodiment 3

[0066] Embodiment 3 is the same as Embodiment 1, except that the substrate in this embodiment is polyethylene.

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Abstract

The invention relates to a method for depositing a fluorinated layer onto a substrate, said method comprising the injection of a gaseous mixture containing a fluorinated compound and a carrier gas into a zone for the discharge or post-discharge of an atmospheric cold plasma at a pressure of between 0.8 and 1.2 bar. The invention is characterised in that the fluorinated compound has a boiling temperature higher than 25 DEG C at a pressure of 1 bar.

Description

technical field [0001] The present invention involves depositing thin layers of hydrophobic compounds on the surface of a substrate. Background technique [0002] It is common practice to modify surfaces in order to impart new properties to them. In this method, in order to render the anti-adhesive surface (including to proteins) antifouling or further (super)hydrophobic, a layer consisting entirely or partly of fluorinated molecules is usually deposited on the anti-adhesive surface. [0003] These methods are currently mainly realized by PACVD (Plasma Assisted Chemical Vapor Deposition) or PECVD (Plasma Enhanced Chemical Vapor Deposition) technology. Conventional techniques include injecting fluorinated gas monomers (CF 4 is the simplest, but there are many alternatives such as C 2 f 6 、C 3 f 8 、C 4 f 8 , Fluoroalkylsilane, etc.). [0004] The type of plasma used (RF, microwave plasma, etc.) varies from study to study, but the principle is the same. The precursors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24B05D5/08
CPCB05D1/62B05D5/083
Inventor 弗朗索瓦·雷尼尔尼古拉斯·范登卡斯蒂尔奥利维耶·布里
Owner UNIV LIBRE DE BRUXELIES
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