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Preparation method of underwater super-oleophobic modified polyvinylidene fluoride membrane

A polyvinylidene fluoride membrane and underwater super-oleophobic technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems that limit wide application, achieve high separation efficiency, good stability, Inexpensive effect

Active Publication Date: 2015-01-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, it has been reported that the cross-linking reaction of dopamine and polyethyleneimine is used to modify the polypropylene membrane to endow it with oil-water separation properties. Molecular species, that is, molecules containing amino or sulfhydryl groups
This greatly limits the wide application of this method

Method used

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  • Preparation method of underwater super-oleophobic modified polyvinylidene fluoride membrane
  • Preparation method of underwater super-oleophobic modified polyvinylidene fluoride membrane
  • Preparation method of underwater super-oleophobic modified polyvinylidene fluoride membrane

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specific Embodiment approach 1

[0024] Specific embodiment one: the preparation method of the modified polyvinylidene fluoride membrane of underwater super-oleophobic in this embodiment, carries out according to the following steps:

[0025] 1. Soak the polyvinylidene fluoride microfiltration membrane in absolute ethanol, and then soak it in the soaking solution for 14-16 minutes;

[0026] 2. Then dissolve the dopamine hydrochloride and the co-modifier in the impregnation solution containing the polyvinylidene fluoride microfiltration membrane, and let it stand for 4h to 12h;

[0027] 3. Take out the polyvinylidene fluoride microfiltration membrane from the immersion solution, wash it with clear water, and then dry it to obtain an underwater super-oleophobic modified polyvinylidene fluoride membrane.

specific Embodiment approach 2

[0028] Embodiment 2: This embodiment differs from Embodiment 1 in that: in Step 1, the pore size of the polyvinylidene fluoride microfiltration membrane is 0.2-50 microns. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that the impregnation solution in step 1 is composed of absolute ethanol and an alkaline solution with a pH value of 8 to 12, wherein the volume percentage of absolute ethanol The content is 5%-40%, and the alkaline solution is Tris-HCl buffer solution or sodium hydroxide aqueous solution. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a modified polyvinylidene fluoride membrane, and in particular relates to a preparation method of an underwater super-oleophobic modified polyvinylidene fluoride membrane. According to the preparation method provided by the invention, silane coupling agent matter which is low in price and is easily available serve as a co-modifying agent, and the auto-polymerization of dopamine and the hydrolytic condensation of the co-modifying agent are simultaneously carried out in an alkaline environment, so that the underwater super-oleophobicity of a polymer membrane is realized, and the polymer membrane has excellent oil-water separation performance. The method comprises the following steps: firstly, soaking a polyvinylidene fluoride micro-filtration membrane in absolute ethyl alcohol, and impregnating the polyvinylidene fluoride micro-filtration membrane in an impregnation liquid; secondly, dissolving dopamine hydrochloride and the co-modifying agent into the impregnation liquid containing the polyvinylidene fluoride micro-filtration membrane, and standing; and thirdly, taking out the polyvinylidene fluoride micro-filtration membrane, cleaning the polyvinylidene fluoride micro-filtration membrane with clear water, and then airing the polyvinylidene fluoride micro-filtration membrane to obtain the modified polyvinylidene fluoride membrane. The method is simple, and the prepared oil-water separation membrane can be reused and can be prepared on a large scale. The preparation method is used for modifying a porous polymer membrane.

Description

technical field [0001] The invention relates to a preparation method of a modified polyvinylidene fluoride film. Background technique [0002] The traditional coating method to modify the metal mesh to have oil-water separation properties is difficult to apply to the modification of porous polymer membranes, because the traditional coating method has poor coating effect and poor stability on polymers. Modification with dopamine is a proven method. Recently, it has been reported that the cross-linking reaction of dopamine and polyethyleneimine is used to modify the polypropylene membrane to endow it with oil-water separation properties. Molecular species are molecules containing amino or sulfhydryl groups. This greatly limits the wide application of this method. Contents of the invention [0003] The invention provides a method for preparing an underwater super-oleophobic modified polyvinylidene fluoride membrane, which uses cheap and easy-to-obtain silane coupling agent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 邵路王振兴郭靖
Owner HARBIN INST OF TECH
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