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Surface modification method of polyvinylidene fluoride membrane

A technology for polyvinylidene fluoride membrane and surface modification, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. Low volume and other problems, to achieve the effect of improving anti-pollution ability, improving surface performance, and simple process

Active Publication Date: 2011-04-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a surface modification method for polyvinylidene fluoride membranes in order to solve the problems of poor hydrophilicity, easy pollution, low water flux and complex modification process of existing polyvinylidene fluoride membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0008] Specific implementation mode 1: The surface modification method of polyvinylidene fluoride membrane in this embodiment is realized according to the following steps: a. Immerse the polyvinylidene fluoride membrane in the mixed solution of oxidant and strong alkali, React for 3 to 30 minutes, then rinse with deionized water until the effluent is clear; b. Soak the rinsed polyvinylidene fluoride film in nano-oxide sol for 5 to 30 minutes, and then rinse with deionized water for 1 to 3 times to obtain A surface-modified polyvinylidene fluoride film; wherein in the step a, the oxidizing agent is potassium permanganate, hydrogen peroxide, sodium hypochlorite, sodium chlorate or potassium chlorate; the strong base is potassium hydroxide or sodium hydroxide; the combination of the oxidizing agent and the strong base in the step a In the mixed solution, the volume ratio of the oxidizing agent to the strong base is 1-3: 1-10, the mass concentration of the oxidizing agent is 0.5-10...

specific Embodiment approach 2

[0010] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step a, the reaction is carried out at 40-80° C. for 10-20 minutes. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0011] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step a, the reaction is carried out at 60° C. for 15 minutes. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

A surface modification method of a polyvinylidene fluoride membrane relates to a surface modification method of a membrane. The surface modification method solves the problems of the existing polyvinylidene fluoride membranes of poor hydrophilicity, easy pollution, low water production rate and complex modification process. The surface modification method comprises the following steps: a. a polyvinylidene fluoride membrane is soaked in mixed solution of an oxidant and strong alkali, and washed; b; the washed polyvinylidene fluoride membrane is soaked in nano oxide sol and washed, and then thesurface modified polyvinylidene fluoride membrane is obtained. The modification method improves anti-pollution capability of the polyvinylidene fluoride membrane, prolongs the service life by 20%-35%, causes the polyvinylidene fluoride membrane to have good hydrophilicity and improves the water flux by 17%-40%, and the process of the method is simple.

Description

technical field [0001] The invention relates to a membrane surface modification method. Background technique [0002] Compared with traditional water treatment processes, membrane separation technology has the characteristics of small footprint, low energy consumption, high effluent quality, good treatment effect, and low impact on the environment. It is a high-tech solution to contemporary energy, resource and environmental issues. However, due to membrane fouling and short membrane life, the wide application of membrane separation technology in the field of water treatment is limited. [0003] Among the currently used membrane materials, the polymer organic polymer polyvinylidene fluoride (PVDF) has the advantages of good impact resistance, abrasion resistance and chemical stability. However, due to the low surface energy of polyvinylidene fluoride, the prepared membrane has poor hydrophilicity, and it is easy to generate adsorption pollution in the water treatment proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34
Inventor 于水利赵晴李冠洋
Owner HARBIN INST OF TECH