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A kind of preparation method of superhydrophilic polyvinylidene fluoride film

A polyvinylidene fluoride membrane, super-hydrophilic technology, applied in chemical instruments and methods, membranes, membrane technology, etc., to achieve good and lasting hydrophilicity, improved stability, and extended service life

Active Publication Date: 2020-04-17
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above technical problems, the present invention provides a method for preparing a superhydrophilic polyvinylidene fluoride membrane, which uses polyethylene glycol ditrifluoromethacrylate and vinylidene fluoride for copolymerization, and the prepared PVDF membrane is superhydrophilic Stable performance, excellent anti-fouling properties, through modification to overcome the problems of reduced rejection rate and flux attenuation caused by membrane fouling, prolong the service life of the membrane, and have a good application prospect in the field of membrane separation

Method used

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  • A kind of preparation method of superhydrophilic polyvinylidene fluoride film
  • A kind of preparation method of superhydrophilic polyvinylidene fluoride film

Examples

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Embodiment 1

[0018] (1) Trifluoromethacrylic acid chlorination: Trifluoromethacrylic acid (5.0469g) and thionyl chloride (5.4607g) were added to a round-bottomed flask equipped with a spherical condenser. An oil bubbler to monitor the evolution of the gas during the reaction, the temperature was heated to 80°C, and the reaction was carried out for 4 hours to obtain a white transparent solution;

[0019] (2) Preparation of polyethylene glycol ditrifluoromethacrylate: polyethylene glycol (7.14g), pyridine (3.5038g), and dichloromethane (9.0368g) were respectively added to a constant pressure dropping funnel In a round-bottomed flask, the mixture was replaced with nitrogen in an ice-salt bath at -10°C for 20 minutes, and the acid-chlorinated trifluoromethacrylic acid was transferred to a constant-pressure dropping funnel under a nitrogen atmosphere, and the addition time was greater than 30 minutes. Keep it at -10°C for 2 hours, then react at room temperature for 16h, add methanol (2ml) to qu...

Embodiment 2

[0023] (1) Trifluoromethacrylic acid chlorination: Trifluoromethacrylic acid (5.0382g) and thionyl chloride (5.4687g) were added to a round-bottomed flask equipped with a spherical condenser. An oil bubbler to monitor the evolution of the gas during the reaction, the temperature was heated to 80°C, and the reaction was carried out for 4 hours to obtain a white transparent solution;

[0024] (2) Preparation of polyethylene glycol ditrifluoromethacrylate: polyethylene glycol (7.14g), pyridine (3.5028g), and dichloromethane (9.0412g) were respectively added to a constant pressure dropping funnel In a round-bottomed flask, the mixture was replaced with nitrogen in an ice-salt bath at -10°C for 20 minutes, and the acid-chlorinated trifluoromethacrylic acid was transferred to a constant-pressure dropping funnel under a nitrogen atmosphere, and the addition time was greater than 30 minutes. Keep it at -10°C for 2 hours, then react at room temperature for 16h, add methanol (2ml) to qu...

Embodiment 3

[0028] (1) trifluoromethacrylic acid chlorination: trifluoromethacrylic acid (5.0547g) and thionyl chloride (5.4687g) are added in the round bottom flask that spherical condenser is housed, installed on the top of spherical condenser An oil bubbler to monitor the evolution of the gas during the reaction, the temperature was heated to 80°C, and the reaction was carried out for 4 hours to obtain a white transparent solution;

[0029](2) Preparation of polyethylene glycol ditrifluoromethacrylate: polyethylene glycol (7.14g), pyridine (3.5541g), and dichloromethane (9.0314g) were respectively added to a constant pressure dropping funnel In a round-bottomed flask, the mixture was replaced with nitrogen in an ice-salt bath at -10°C for 20 minutes, and the acid-chlorinated trifluoromethacrylic acid was transferred to a constant-pressure dropping funnel under a nitrogen atmosphere, and the addition time was greater than 30 minutes. Keep it at -10°C for 2 hours, then react at room temp...

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Abstract

The invention discloses a method for preparing a superhydrophilic polyvinylidene fluoride membrane, which belongs to the technical field of polymer membrane separation. Polyethylene glycol ditrifluoromethacrylate and vinylidene fluoride are used for copolymerization. Both ends of the alcohol are connected with trifluoromethacrylic acid monomer. During the copolymerization reaction, vinylidene fluoride and polyethylene glycol ditrifluoromethacrylate are cross-linked and copolymerized to form a cross-linked polymer, which is similar to a network structure. The stability of the copolymer is improved, and at the same time, the hydrophilicity of the prepared PVDF membrane is greatly improved, so that the surface of the membrane can achieve superhydrophilic performance. The PVDF membrane prepared by the method has stable super-hydrophilicity and excellent anti-fouling properties, and the problems of reduced interception rate and flux attenuation caused by membrane fouling can be overcome through modification to prolong the service life of the membrane. It has a good application prospect in the field of membrane separation.

Description

technical field [0001] The invention belongs to the technical field of polymer membrane separation, and in particular relates to a preparation method of a superhydrophilic polyvinylidene fluoride membrane. Background technique [0002] Membrane separation technology has been widely used due to its functions of separation, concentration, purification and refining, as well as high efficiency, energy saving, environmental protection, molecular level filtration and simple and easy control of the filtration process. The pore size of the membrane is generally on the micron scale, among which microfiltration (MF) and ultrafiltration (UF) membrane technologies are developing rapidly, and the market is growing rapidly. Microfiltration membranes and ultrafiltration membranes currently used in water treatment are mainly membranes made of polymer materials, including fluoropolymers, polyolefins, polyamides, polyesters, and polysulfones. Among the fluoropolymers, polyvinylidene fluoride...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/80B01D67/00
CPCB01D67/0013B01D71/80B01D2325/36
Inventor 刘道鑫张炉青张书升张亚彬宗传永张书香
Owner UNIV OF JINAN