Fluoropolymer/nano SiO2 superhydrophobic coating layer and preparation method thereof

A super-hydrophobic coating and super-hydrophobic coating technology, which is applied in the coating, anti-corrosion coating, etc., can solve the problems of complicated process, short service life, and decreased hydrophobic performance, and achieve simple preparation methods, broad application prospects, and enhanced mechanical properties. Effect

Active Publication Date: 2018-07-20
UNIV OF JINAN
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  • Abstract
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Problems solved by technology

These preparation methods have high cost, large equipment investment, complicated process, high requirements on the environment, and are not suitable for large-scale preparation.
Moreover, the prepared superhydrophobic coating has the disadvantages of obvious decline in hydrophobic performance after being stained by pollutants, the microstructure on the surface of the superhydrophobic coating is easily destroyed, and the service life is short.
[0004] Fluorine-containing copolymers have the advantages of high surface activity, high thermal and chemical stability, and oleophobic and hydrophobic properties. However, fluorine-containing copolymers also have problems such as poor mechanical properties, poor wettability and compatibility with pigments, how to reduce the Insufficient performance of fluoropolymers, while maximizing the excellent characteristics of fluoropolymers is still an important challenge

Method used

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  • Fluoropolymer/nano SiO2 superhydrophobic coating layer and preparation method thereof
  • Fluoropolymer/nano SiO2 superhydrophobic coating layer and preparation method thereof

Examples

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preparation example Construction

[0033] In one embodiment of the present invention, a kind of fluorine-containing copolymer / nanometer SiO is provided 2 The preparation method of superhydrophobic coating, comprises the steps:

[0034] (1) Add trifluoroethyl methacrylate (TFEMA) and perfluoroalkyl ethyl acrylate to the reaction solvent in a molar ratio of 1:0.01 to 1:100; use azobisisobutyronitrile (AIBN) as The initiator carries out free radical solution polymerization, and the temperature of free radical solution polymerization is between 60 and 80°C; the reaction time is 12 to 48 hours; the polymer produced by the reaction is repeatedly dissolved and precipitated three times; dried at 100°C for 48 hours or more Obtain the binary random fluorine-containing copolymer of TFEMA and TEAc-8;

[0035] (2) Dissolving the resulting fluorine-containing copolymer in a solvent to form a polymer solution, adding hydrophobic nano-SiO 2 , so that nano-SiO 2The content of the superhydrophobic composite coating is 1-10wt%...

Embodiment 1

[0046] Add 3g of TFEMA, 3g of perfluorobutyl ethyl acrylate, 20ml of N,N-dimethylformamide and 0.05g of AIBN into a 100ml single-necked bottle, vacuumize and protect with nitrogen. After 30 minutes of magnetic stirring at room temperature, the temperature was raised to 60° C., and the reaction was stopped after 48 hours. The reacted solution was added dropwise to 500ml of distilled water, and after standing for 20 minutes, the precipitate was filtered out, and dried at 100°C. The obtained crude product was repeatedly dissolved and precipitated three times with tetrahydrofuran and methanol, and dried at 100° C. for 48 hours to obtain the final product—a fluorine-containing copolymer.

[0047] 0.01g fluorine-containing copolymer and 0.01g nano-SiO 2 Dissolved in 1ml N,N-dimethylformamide, ultrasonicated for 30 minutes to obtain fluorine-containing copolymer / nano-SiO 2 Superhydrophobic coatings. Take 100 μl of the superhydrophobic coating and spin-coat it on a glass slide to f...

Embodiment 2

[0050] Add 3g of TFEMA, 6g of perfluorooctyl ethyl acrylate, 25ml of N,N-dimethylformamide and 0.1g of AIBN into a 100ml single-necked bottle, vacuumize and protect with nitrogen. After 30 minutes of magnetic stirring at room temperature, the temperature was raised to 80° C., and the reaction was stopped after 24 hours. The reacted solution was added dropwise to 500ml of distilled water, and after standing for 20 minutes, the precipitate was filtered out, and dried at 100°C. The obtained crude product was repeatedly dissolved and precipitated three times with tetrahydrofuran and methanol, and dried at 100° C. for 48 hours to obtain the final product—a fluorine-containing copolymer.

[0051] 0.01g fluorine-containing copolymer and 0.01g nano-SiO 2 Dissolved in 1ml N,N-dimethylacetamide, ultrasonic treatment for 30 minutes to obtain fluorine-containing copolymer / nano-SiO 2 Superhydrophobic coatings. Take 60 μl of the superhydrophobic coating and spin-coat it on a glass slide ...

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Abstract

The invention discloses a fluoropolymer/nano SiO2 superhydrophobic coating layer and a preparation method thereof. The preparation of the superhydrophobic coating layer includes the following steps: (1) adding trifluoroethyl methacrylate and perfluoroalkylethyl acrylate into a solvent a according to the molar ratio of 1:0.01-1:100; with azodiisobutyronitrile as an initiator, carrying out free radical solution polymerization; and repeatedly dissolving and precipitating the polymer prepared from the reaction, and then drying, to obtain a fluoropolymer; (2) dissolving the fluoropolymer in a solvent b, to obtain a polymer solution; adding nano SiO2 into the polymer solution, making the content of the nano SiO2 be 1-10 wt%, carrying out ultrasonic treatment, spin-coating on a substrate, and drying to form the superhydrophobic coating layer. The preparation method of the fluoropolymer/nano SiO2 superhydrophobic coating layer is simple, and is suitable for large area preparation; and the prepared superhydrophobic coating layer has the advantages of high interfacial strength, good thermal stability and strong corrosion resistance, and has a broad application prospect.

Description

technical field [0001] The invention relates to the technical field of preparation of superhydrophobic coatings, in particular to a fluorine-containing copolymer / nano-SiO 2 Superhydrophobic coating and its preparation method. Background technique [0002] A superhydrophobic interface is an interface with special wettability. Typically, the static water contact angle of a superhydrophobic interface is >150°. On the superhydrophobic interface, the water droplet will keep a good spherical shape and cannot wet its interface. On some special super-hydrophobic interfaces, water droplets can roll freely while not wetting the interface, and impurities such as dust on the surface are taken away by water droplets to form a self-cleaning interface. This effect is called the self-lotus leaf effect. The interface has a static water contact angle of >150° and a rolling angle of <5°. Due to its special wettability, the superhydrophobic interface has great application value in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/16C09D5/08C09D7/61C08F220/24
CPCC08F220/24C08K3/36C08K2201/011C09D5/08C09D133/16
Inventor 张书香胡梅宗传永张亚彬张炉青马佳晨
Owner UNIV OF JINAN
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