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Method for preparing super-hydrophobic sponges

A technology of super-hydrophobic sponge and sponge, applied in the field of functional material preparation, can solve the problems of easy change of pH of reaction medium, increase of material preparation cost, low loading of modified layer, etc., and achieve good recyclability, high coverage, and economical efficiency. The effect of manufacturing cost

Active Publication Date: 2016-05-11
GUANGXI SISLAND IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Huang Shouying used a very high concentration of dopamine (8 mg / mL) to modify the surface of polyurethane sponges with polydopamine nanoparticles combined with dodecanethiol in one step to prepare superhydrophobic sponges. The reaction solution was mixed with water and ethanol with a pH of 8.5. However, due to the lack of a buffer system, the pH of the reaction medium is prone to change, making the reproducibility of the preparation of the superhydrophobic sponge poor, and the scanning electron microscope of the superhydrophobic sponge shows that the amount of nanoparticles is small, indicating that the loading of the modified layer is low (ACS .Appl.Mater.Interfaces, 2014, 6, 17144-17150)
In addition, such a high concentration of dopamine will inevitably lead to an increase in the cost of material preparation

Method used

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  • Method for preparing super-hydrophobic sponges

Examples

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Effect test

Embodiment 1

[0034] The melamine resin sponge was modified by two-step low-concentration dopamine solution and covalently bonded with mercapto long-chain alkanes with low surface energy to prepare superhydrophobic sponge. Step (1): melamine resin sponge is soaked in the Tris-HCl buffer solution (pH value is 8.5) that solution concentration is 0.5mol / L, adds dopamine hydrochloride (final concentration is 2.0mg / mL), makes dopamine in The surface of the melamine resin sponge is polymerized, reacted at room temperature for 6h to obtain the melamine resin sponge coated with polydopamine; step (2): soak the melamine resin sponge coated with polydopamine gained in step (1) in water / ethanol / ammonia water medium, Wherein the mixing ratio of water and ethanol is a volume ratio of 4:1; the final concentration of ammonia water is 0.1mol / L, adding concentration is 3.3mg / mL of dopamine hydrochloride and mercaptododecane, so that mercaptododecane accounts for the volume of the mixed solution The percenta...

Embodiment 2

[0040] The melamine resin sponge was modified by two-step low-concentration dopamine solution and covalently bonded with mercapto long-chain alkanes with low surface energy to prepare superhydrophobic sponge. Step (1): melamine resin sponge is soaked in the Tris-HCl buffer solution (pH value is 8.5) that solution concentration is 0.2mol / L, adds dopamine hydrochloride (concentration is 1.0mg / mL), makes dopamine in melamine The surface of the resin sponge is polymerized, and reacted at room temperature for 10h to obtain a melamine resin sponge coated with polydopamine; step (2): soak the melamine resin sponge coated with polydopamine gained in step (1) in water / ethanol / ammonia water medium, wherein The mixing ratio of water and ethanol is 2:1 by volume; the final concentration of ammonia water is 0.2mol / L, and dopamine hydrochloride and mercaptododecane are added with a concentration of 4.0mg / mL, so that mercaptododecane accounts for 100% of the volume of the mixed solution. con...

Embodiment 3

[0043] The melamine resin sponge was modified by two-step low-concentration dopamine solution and covalently bonded with mercapto long-chain alkanes with low surface energy to prepare superhydrophobic sponge. Step (1): melamine resin sponge is soaked in the Tris-HCl buffer solution (pH value is 8.5) that solution concentration is 0.4mol / L, adds dopamine hydrochloride (concentration is 1.5mg / mL), makes dopamine in melamine The surface of the resin sponge is polymerized, reacted at room temperature for 5h to obtain a melamine resin sponge coated with polydopamine; step (2): soak the melamine resin sponge coated with polydopamine gained in step (1) in water / ethanol / ammonia water medium, wherein The mixing ratio of water and ethanol is a volume ratio of 3:1; the final concentration of ammonia water is 0.1mol / L, and dopamine hydrochloride and mercaptododecane with a concentration of 3.0mg / mL are added so that mercaptododecane accounts for 100% of the volume of the mixed solution. T...

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Abstract

The invention discloses a method for preparing super-hydrophobic sponges. The method includes steps of coating poly-dopamine on the surfaces of melamine resin sponges; modifying the surfaces of the poly-dopamine by the aid of poly-dopamine nano-particles combined with mercapto long-chain alkane so as to obtain the super-hydrophobic sponges. The number of carbon atoms of the mercapto long-chain alkane is 6-18. The method has the advantages that the super-hydrophobic sponges can be prepared by the aid of the two-step method, and nano-particle modification layers are arranged on the surfaces of the super-hydrophobic sponges and are high in coverage and loading capacity; the super-hydrophobic sponges are excellent in acid resistance and alkali resistance, good in foldability and reusability and high in oil adsorption; the poly-dopamine required by the method is low in concentration, accordingly, the manufacturing cost can be saved, and the method is simple and convenient and is applicable to mass production.

Description

technical field [0001] The invention relates to the technical field of preparation of functional materials, in particular to a method for preparing a superhydrophobic sponge. Background technique [0002] Wettability is one of the important characteristics of solid surfaces, which is determined by the chemical composition and microscopic geometry of the surface. The wettability of a solid surface is usually measured by the static contact angle CA (contact angle) of a water drop on a solid horizontal plane. Materials with CA<90° are hydrophilic materials, and materials with CA<5° are called superhydrophilic materials. Correspondingly, materials with CA>90° are hydrophobic materials, and materials with CA>150° are superhydrophobic materials. Because superhydrophobic materials usually have superoleophilic properties, superhydrophobic materials have been widely used in water-oil separation and other fields in recent years. [0003] With the continuous aggravation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08G73/02
CPCC08G73/02C08J9/40C08J9/405C08J2361/28
Inventor 周璘刘吉洋许枭然王娇王小慧
Owner GUANGXI SISLAND IND CO LTD
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