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Preparation method and applications of super hydrophobic oleophobic material with pH responsiveness

A super-amphiphobic and responsive technology, applied in separation methods, chemical instruments and methods, liquid separation, etc., to achieve excellent super-hydrophobicity/super-oleophobicity, excellent buoyancy, and mild reaction conditions

Active Publication Date: 2019-01-11
西安奈微新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many reports on pH-responsive materials, but most of them can only achieve a limited number of conversions between the two extreme affinities.
In addition, reports related to paints and simultaneously involving in situ pH responsiveness are rare.

Method used

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  • Preparation method and applications of super hydrophobic oleophobic material with pH responsiveness
  • Preparation method and applications of super hydrophobic oleophobic material with pH responsiveness
  • Preparation method and applications of super hydrophobic oleophobic material with pH responsiveness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of a pH-responsive super-amphiphobic material, comprising the following steps:

[0035] Step 1. Prepare an ethanol solution of bis[3-(trimethoxysilyl)propyl]ethylenediamine (i.e. 1834 silane) with a volume fraction of 1.8% to 2.5%. Mix 0.2 mL of 1834 silane with a purity of 98% and to its volume ratio (ie V 1834 :V 无水乙醇 ) about 1:49 in absolute ethanol, and then continuously stir the obtained mixed solution for 30 minutes to obtain an ethanol solution of 1834 silane with a volume fraction of about 1.8% to 2.5%, which is set aside.

[0036] Step 2. Prepare a pH-responsive superamphiphobic material: Weigh 0.65g of perfluorooctanoic acid (PFOA) with a purity of 98%, add it to 8.5mL of absolute ethanol and magnetically stir until it is completely dissolved, and then add it to the mixed solution Add to PFOA mass ratio (W 高岭土 :W PFOA ) about 6-7.5:1 kaolin particles, ultrasonically oscillate for 30 minutes to disperse the kaolin evenly in the solution...

Embodiment 2

[0051] Add kaolin with a particle size of 300-400nm to the ethanol solution of perfluorooctanoic acid, mix well, add the ethanol solution of silane, heat to 50°C with stirring, and keep it warm for 4 hours to obtain a suspension, and coat the suspension on the substrate surface, and dried to obtain a pH-responsive superamphiphobic material.

[0052] Wherein, the silane is bis[3-(trimethoxysilyl)propyl]ethylenediamine, and the ratio of perfluorooctanoic acid to ethanol in the ethanol solution of perfluorooctanoic acid is 0.60 g:8.5 mL. The volume concentration of the ethanol solution of silane was 1.8%. The ratio of perfluorooctanoic acid, kaolin and silane ethanol solution is 0.60g: 4.5g: 2.5mL.

Embodiment 3

[0054] Add kaolin with a particle size of 300-400nm to the ethanol solution of perfluorooctanoic acid, mix evenly, add the ethanol solution of silane, heat to 60°C under stirring, and keep it warm for 2 hours to obtain a suspension, and coat the suspension on the substrate surface, and dried to obtain a pH-responsive superamphiphobic material.

[0055] Wherein, the silane is bis[3-(trimethoxysilyl)propyl]ethylenediamine, and the ratio of perfluorooctanoic acid to ethanol in the ethanol solution of perfluorooctanoic acid is 0.70 g:8.5 mL. The volume concentration of the ethanol solution of silane was 2.5%. The ratio of perfluorooctanoic acid, kaolin and silane ethanol solution is 0.70g:4.5g:2.7mL.

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Abstract

The invention discloses a preparation method and applications of a super hydrophobic oleophobic material with pH responsiveness. The preparation method comprises following steps: kaolin is added intoan ethanol solution of perfluorocapylic acid, after uniform mixing, an ethanol solution of silane is added, an obtained mixture is heated to 50 to 60 DEG C with stirring, thermal insulation is carriedout for 2 to 4h so as to obtain a suspending solution, the suspending solution is used for coating the surface of a substrate, and drying is carried out so as to obtain the super hydrophobic oleophobic material with pH responsiveness. The super hydrophobic oleophobic material possesses excellent super hydrophobicity and lipophobicity, and excellent wear resistance and corrosion resistance; in-suit or ex-situ pH induced material surface wetability change can be caused; a plurality of conversions between the hydrophobicity and lipophobicity can be realized. The super hydrophobic oleophobic material can be used for effective separation of a plurality of types of oil water mixtures, and especially treatment of oil-in-water emulsion, and the application prospect in treatment of leaked crude oil and purification of oil-containing waste water is promising.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of responsive super-amphiphobic materials, and in particular relates to a preparation method and application of a pH-responsive super-amphiphobic material. Background technique [0002] Industrial oily wastewater and frequent oil spills have posed a serious threat to the ecological environment and human health. How to effectively separate oily wastewater has become a global challenge. In recent years, with the rapid development of interface science and bionics, various materials with special wettability to oil or water have been developed as new separation materials for oil-water separation. They are novel, economical and efficient. , so it shows a broad application prospect in the field of oily sewage treatment. Generally, such special wettability separation materials fall into three categories, namely "oil removal" materials, "water removal" materials, and smart switchable w...

Claims

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Application Information

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IPC IPC(8): B01D17/022
Inventor 屈孟男何金梅马利利王嘉鑫周亦晨赵彧张毅
Owner 西安奈微新材料有限公司
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