Durable super-hydrophilic or super-hydrophobic plastic surface and preparation method thereof

A super-hydrophilic and super-hydrophobic technology, applied in the coating and other directions, can solve the problems of not reaching the super-lyophobic state, no test instructions for durability, etc., achieving good industrial application prospects, strong durability, and simple and convenient preparation process. Effect

Inactive Publication Date: 2019-01-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN106423769A discloses a super-hydrophobic and super-oleophobic antifouling coating prepared for plexiglass, but its liquid contact angle does not reach 150°, and the contact

Method used

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  • Durable super-hydrophilic or super-hydrophobic plastic surface and preparation method thereof
  • Durable super-hydrophilic or super-hydrophobic plastic surface and preparation method thereof
  • Durable super-hydrophilic or super-hydrophobic plastic surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation of durable super-hydrophilic plastic surface specifically comprises the following steps:

[0047] (1) Etch micron-scale structures on the surface of plexiglass with a laser etching machine. The etched structure is square in shape, with a side length of 350 µm and a spacing of 700 µm; the parameters of the laser etching machine are: speed 20%, energy 20%;

[0048] (2) Clean the etched sample with ethanol, dry at 50°C, and set aside;

[0049](3) The preparation method of superhydrophilic modified silica (by weight): Take 46 parts of ethyl orthosilicate in 33 parts of ethanol solution, stir at 50 °C for 30 minutes, add 2.6 parts of ammonia water and 7.2 parts of distilled water, continue to stir at constant temperature for 8 hours, add 1.26 parts of heptadecafluorodecyltrimethoxysilane to it, and continue to keep constant temperature for 12 hours; centrifuge the obtained suspension at a speed of 6000 rpm for 10 minutes, and take out the centrifuged product...

Embodiment 2

[0057] (1) Etch the micron structure on the surface of the plexiglass with a laser etching machine. The etched structure is cylindrical in shape, with a diameter of 70 µm and a pitch of 140 µm; the parameters of the laser etching machine are: speed 20%, energy 50 %;

[0058] (2) Clean the etched sample with acetone, dry at 50°C, and set aside;

[0059] (3) The preparation method of superhydrophobic modified nano-silica (by weight): Take 74 parts of tetraethyl orthosilicate in 60 parts of ethanol solution, stir at 30°C for 30 minutes, add 2.6 parts of ammonia water and 0 parts of distilled water, continue to stir at a constant temperature for 3 hours, add 1.1 parts of perfluorodecyltrichlorosilane to it, and continue to keep the temperature for 6 hours; centrifuge the obtained suspension at a speed of 6000 rpm for 10 minutes, and take out the centrifuged product nanometer Silica, cleaned with ethanol, under the same centrifugation conditions, continue to centrifuge and then wa...

Embodiment 3

[0065] (1) Use a laser etching machine to etch the micron structure on the surface of the plexiglass. The etched structure shape is a triangular truss, the side length is 140µm, and the spacing is 280µm; the parameters of the laser etching machine are: speed 20%, Energy 30%;

[0066] (2) Clean the etched sample with ethanol, dry at 50°C, and set aside;

[0067] (3) The preparation method of superhydrophilic modified nano-silica (by weight): Take 46 parts of ethyl orthosilicate in 46 parts of ethanol solution, stir at 25 °C for 30 minutes, add 5.9 parts of ammonia water and 4 parts of distilled water, continue to stir at constant temperature for 3 hours, take 1 part of heptadecafluorodecyltrimethoxysilane, add it, and continue to keep constant temperature for 12 hours; centrifuge the obtained suspension at a speed of 6000 rpm, centrifuge for 10 minutes, take out the centrifuge The product nano-silica is cleaned with ethanol, and under the same centrifugation conditions, the ce...

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Abstract

The invention discloses a durable super-hydrophilic or super-hydrophobic plastic surface and a preparation method thereof. The method comprises the following steps of: (1) etching a micron-scale structure on the surface of a plastic substrate by using a laser etching instrument, and then cleaning and drying the etched plastic substrate; (2) preparing hydrophilic or hydrophobic modified nano-silica; (3) coating the surface of the dried plastic substrate obtained in the Step (1) with a prepared a colloidal solution of a bonding layer, drying, and then coating with a hydrophilic or hydrophobic modified nano-silica particle solution, and drying to obtain the durable super-hydrophilic or super-hydrophobic plastic surface. The preparation method of the invention is carried out at a low temperature, which ensures that the plastic substrate will not be molten or deform and guarantees the durability of the super-hydrophilic or super-hydrophobic plastic surface. The preparation method has a goodindustrial application prospect.

Description

technical field [0001] The invention relates to the technical field of plastic surface wettability modification, in particular to a durable superhydrophilic or superhydrophobic plastic surface and a preparation method thereof. Background technique [0002] Since the self-cleaning mechanism of the lotus leaf surface was discovered, the wetting phenomenon of the material surface has stimulated the research enthusiasm of researchers. Wetting has two extreme interface effects: complete wetting and complete non-wetting. When the contact angle of the liquid on the surface is less than 10°, it is super-hydrophilic and close to complete wetting; when the contact angle of the liquid on the surface is greater than 150° and the rolling angle is less than 10°, it is super-hydrophobic, close to complete non-wetting wet phenomenon. The enhancement of the interface effect will make the solid surface present many special properties, such as the tiny water droplets on the surface are easy ...

Claims

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Application Information

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IPC IPC(8): C08J7/06C08J7/04C08J7/12
CPCC08J7/0423C08J7/06C08J7/123
Inventor 张立志职晶慧綦戎辉
Owner SOUTH CHINA UNIV OF TECH
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