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Hydrophilic modification method for PVDF (Polyvinylidene Fluoride) ultra-filtration film

A hydrophilic modification and ultrafiltration membrane technology, which is applied in the field of hydrophilic modification of PVDF ultrafiltration membranes, can solve the problems of limiting the popularization and application of PVDF membrane materials, hindering the improvement of PVDF water flux, etc., and achieving performance stability improvement, Improved hydrophilicity and improved process stability

Inactive Publication Date: 2014-12-03
BEIJING ORIGIN WATER FILM TECH
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AI Technical Summary

Problems solved by technology

[0005] The strong hydrophobic effect is currently the main factor hindering the improvement of PVDF water flux, which limits the further promotion and application of PVDF as a membrane material in actual production.

Method used

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Embodiment Construction

[0024] The technical solution of the present invention will be described in further detail below in conjunction with the embodiments.

[0025] The invention provides a hydrophilic modification method of a PVDF water filtration membrane, which improves the hydrophilicity of the PVDF and increases the water flux. Specifically, it is realized through the following steps:

[0026] A. Ultrafiltration membrane pretreatment steps

[0027] Soak the PVDF ultrafiltration membrane in clean water for 12-24 hours to remove the additives, solvents and other substances added in the production process contained in the PVDF ultrafiltration membrane;

[0028] B. Dehydrofluorination step

[0029] Under the conditions of temperature 40-60°C and stirring, the PVDF ultrafiltration membrane pretreated in step A was placed in a mixed aqueous solution of sodium hydroxide and potassium permanganate for 10-20min to remove the The HF on the surface of the PVDF ultrafiltration membrane forms a C=C doub...

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Abstract

The invention provides a hydrophilic modification method for a PVDF (Polyvinylidene Fluoride) ultra-filtration film. The hydrophilic modification method for the PVDF ultra-filtration film is mainly used for improving the poor hydrophilcity of the surface of the PVDF ultra-filtration film by virtue of a chemical method and sequentially comprises the following steps: carrying out pretreatment on the ultra-filtration film, carrying out dehydrofluorination, washing, carrying out free radical treatment, grafting and sizing a hydrophilic layer. Compared with the blending modification in the prior art, for the hydrophilic modification method, the hydrophilcity property stability is obviously improved; water flux also can meet the requirements in actual production; and the hydrophilic modification process is uniform in reaction, easy to operate and stable.

Description

technical field [0001] The invention relates to a hydrophilic modification method of a PVDF ultrafiltration membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) has excellent chemical stability, thermal stability, mechanical stability and radiation resistance because it contains C-F bonds with higher bond energy, so that C-C bonds with lower bond energy are surrounded by C-F bonds. Features. As a typical ultrafiltration membrane material, it is widely used in various water treatment fields, such as domestic sewage treatment, industrial wastewater treatment, etc. [0003] However, the C-F bond and C-H bond on the surface of the ultrafiltration membrane made of PVDF determine its weak hydrophilicity, making it difficult for PVDF to form hydrogen bonds with water molecules, resulting in poor wettability and strong hydrophobicity; Difficult to attach to the surface of PVDF membrane, resulting in low water flux (Water flux refers to the volume of pure water pe...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 陈亦力祝尊路代攀王宗印赵小龙关晶
Owner BEIJING ORIGIN WATER FILM TECH
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