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A polyvinylidene fluoride separation membrane and its preparation method and application in sewage treatment

A polyvinylidene fluoride and separation membrane technology, applied in the field of membrane separation, can solve the problems of poor hydrophilicity, easy adsorption of organic pollutants, and shortened service life of polyvinylidene fluoride separation membranes, so as to improve hydrophilicity and anti-pollution performance, improve pure water flux, and prolong service life

Active Publication Date: 2021-11-26
GO HIGHER ENVIRONMENT GRP CO LTD
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Problems solved by technology

[0002] Polyvinylidene fluoride (PVDF for short) is a very good membrane material with excellent chemical stability, radiation resistance, pollution resistance and heat resistance, but due to its extremely low surface energy, PVDF has extremely strong The hydrophobicity of the prepared polyvinylidene fluoride separation membrane is poor in hydrophilicity. At the same time, in sewage treatment, the polyvinylidene fluoride separation membrane is easy to adsorb organic pollutants, resulting in reduced membrane flux and shortened service life.

Method used

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  • A polyvinylidene fluoride separation membrane and its preparation method and application in sewage treatment
  • A polyvinylidene fluoride separation membrane and its preparation method and application in sewage treatment
  • A polyvinylidene fluoride separation membrane and its preparation method and application in sewage treatment

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Embodiment Construction

[0024] The present application will be described in further detail below in combination with specific embodiments.

[0025] The polyvinylidene fluoride in the following examples and comparative examples is FR904 polyvinylidene fluoride; the weight percentage concentration of the formaldehyde solution is 37%.

[0026] Preparation example of cardanol-based polymer

[0027] Table 1 The ingredient list of cardanol-based polymer (unit: g)

[0028]

[0029] The specific preparation method of the above-mentioned cardanol-based polymer is: add cardanol, phenol, oxalic acid to a four-necked round-bottomed flask equipped with a stirrer, a thermometer, a reflux condenser and a dropping funnel, heat to 95 ° C, and then Add dropwise formaldehyde solution with a concentration of 37% by weight within 1 hour, and continue to keep warm for 3 hours after the dropwise addition; cool down to room temperature, soak in water at 50-60°C for 30 minutes and repeat 10 times, and dry to obtain carda...

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Abstract

The application relates to the technical field of membrane separation, and specifically discloses a polyvinylidene fluoride separation membrane, its preparation method and its application in sewage treatment. A method for preparing a polyvinylidene fluoride separation membrane comprises the following steps: (1) uniformly mixing polyvinylidene fluoride, a cardanol-based polymer, a porogen, and an aprotic polar solvent to form a casting solution; (2) mixing The casting solution is cast on the flat substrate to form a flat liquid film; (3) the flat liquid film is immersed in a coagulation bath, and after washing and drying, a polyvinylidene fluoride separation membrane is obtained; the cardanol-based polymer is made of cashew nuts It is obtained by polycondensation reaction of phenol, phenolic compounds and formaldehyde aqueous solution with a concentration of 30-50% by weight under an acidic catalyst. A polyvinylidene fluoride separation membrane is prepared by the above preparation method. The application improves the hydrophilicity and pollution resistance of the membrane, and prolongs the service life of the membrane.

Description

technical field [0001] The present application relates to the field of membrane separation technology, more specifically, it relates to a polyvinylidene fluoride separation membrane, its preparation method and its application in sewage treatment. Background technique [0002] Polyvinylidene fluoride (PVDF for short) is a very good membrane material with excellent chemical stability, radiation resistance, pollution resistance and heat resistance, but due to its extremely low surface energy, PVDF has extremely strong The hydrophobicity of the prepared polyvinylidene fluoride separation membrane is poor in hydrophilicity. At the same time, in sewage treatment, the polyvinylidene fluoride separation membrane is easy to absorb organic pollutants, resulting in reduced membrane flux and shortened service life. Therefore, how to effectively improve the hydrophilicity of membranes and reduce membrane fouling is the main goal of many researchers. Contents of the invention [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34C02F3/12
CPCB01D71/34C02F3/1268B01D2325/36Y02W10/10
Inventor 陈福泰杨艳刘兴甜
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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