A kind of superhydrophobic superoleophobic coating and preparation method thereof

A super-hydrophobic, super-oleophobic, and coating technology, which is applied in coatings and other directions, can solve the problems of complex preparation methods of super-amphiphobic surfaces, high cost, and narrow application range of super-amphiphobic surfaces, achieving low cost, non-pollution, and synthetic high efficiency effect

Active Publication Date: 2021-06-01
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Super-amphiphobic surfaces have problems such as complex preparation methods, high cost, and dependence on special substrates, which make the application range of super-amphiphobic surfaces narrow, and there are not many products on the market.

Method used

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  • A kind of superhydrophobic superoleophobic coating and preparation method thereof
  • A kind of superhydrophobic superoleophobic coating and preparation method thereof
  • A kind of superhydrophobic superoleophobic coating and preparation method thereof

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Experimental program
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preparation example Construction

[0032] The preparation method of the superhydrophobic superoleophobic coating provided by the invention is as follows:

[0033] 1. Preparation of St-AA copolymer emulsion:

[0034] Add deionized water, styrene, acrylic monomer, initiator and cross-linking monomer divinylbenzene in turn to the three-necked flask, stir well at room temperature, then heat to 40~90℃, keep warm for 1~10h The obtained white emulsion was directly used in the next reaction.

[0035] 2. PFDTS-SiO 2 -copolymer emulsion synthesis:

[0036] Add ethanol, orthosilicate, and the above-mentioned copolymer emulsion into the three-necked bottle in turn, and stir to obtain a uniform emulsion. Then add ammonia water, stir and heat to 30-80 DEG C, keep the temperature for 0.5-8 hours, add fluorosilicone, continue keeping the temperature for 0.5-8 hours, stop the experiment, and obtain a raspberry-like nanoparticle emulsion.

[0037] The specific process is, when preparing the St-AA copolymer emulsion, acrylic ...

Embodiment 1

[0040] First, 2.5g of styrene, 1.0g of acrylic acid, 0.015g of potassium persulfate, 150μL of divinylbenzene, and 50mL of deionized water were added to a three-necked flask, stirred at room temperature for 30min, and then heated to 78°C (200rpm) , the obtained white emulsion after 6h of incubation. Then, 15 mL of ethanol, 1 mL of ethyl orthosilicate, and 6 mL of white emulsion were sequentially added to the three-necked flask, and stirred for 30 mins to obtain a uniform emulsion. Add 0.5 mL of ammonia water with a volume percentage of 25%, stir and heat to 60° C., hold for 90 minutes, add 50 μL of PFDTS, continue to hold for 90 minutes, and stop the experiment. The obtained PFDTS-SiO 2 -copolymer emulsion for the preparation of coating films.

Embodiment 2

[0042] First, 1.5g of styrene, 2.0g of methacrylic acid, 0.020g of ammonium persulfate, 150μL of divinylbenzene, and 50mL of deionized water were added to the three-necked flask, stirred at room temperature for 50min, and then heated to 85°C ( 300 rpm), the obtained white emulsion was obtained after 9 h of incubation. Then, 20 mL of methanol, 1.5 mL of methyl orthosilicate, and 6 mL of white emulsion were sequentially added to the three-necked flask, and stirred for 50 mins to obtain a uniform emulsion. Add 0.5 mL of ammonia water with a volume percentage of 25%, stir and heat to 70° C., hold for 60 minutes, add 100 μL of PFOTS, continue to hold for 8 hours, and stop the experiment. The obtained PFOTS-SiO 2 -copolymer emulsion for the preparation of coating films.

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Abstract

A super-hydrophobic and super-oleophobic coating and a preparation method thereof. Deionized water, styrene, acrylic monomers, initiators and divinylbenzene are added to a container, stirred evenly, heated to 40-90° C., and kept at a temperature of 1- 10h to obtain a white St-AA copolymer emulsion; add solvent, orthosilicate and St-AA copolymer emulsion into the container, and stir to obtain a homogeneous emulsion; then add ammonia water to the homogeneous emulsion, stir and heat to 30-80° C. , adding fluorosilicone after heat preservation for 0.5 to 8 hours, and continuing to heat preservation for 0.5 to 8 hours to obtain a superhydrophobic and superoleophobic coating. The invention does not need post-treatment to realize super-amphiphobicity; does not need extreme or environment-unfriendly conditions in the synthesis process, uses water and ethanol as solvents in the preparation, is not easy to pollute the environment, and is suitable for large-scale production. The coating synthesized by the method has good stability, and the storage stability is more than 2 years.

Description

technical field [0001] The invention belongs to the technical field of special coating films, and relates to a superhydrophobic and superoleophobic coating and a preparation method thereof. Background technique [0002] The wettability of solid surfaces is an important property of engineering materials, which plays an important role in people's daily life and industrial production, such as tarpaulins and self-cleaning glass in daily life; mineral foam in industry Flotation, oil extraction, adhesion and bonding, washing, pesticide spraying, fluid transport, etc. are all closely related to surface wettability. Super-amphiphobic surfaces are water and oil contact angles of 150° or more, respectively, and low contact angle hysteresis (rolling angle) with water and oil. There are some animals and plants in nature that also show this super-double-sparse phenomenon. Gorb and Rokitov reported the hyperamphiphobicity of a leafhopper. The surfaces of cicada wings have highly struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D125/08C09D133/02C09D7/61C08F212/08C08F220/06C08F212/36
CPCC08F212/08C08F220/06C08K2201/011C09D125/08C09D133/02C09D7/61C08K3/36C08F212/36
Inventor 郝红孙苗苗赵夏段延萍高超权薛甲张冰冰
Owner NORTHWEST UNIV
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