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Amphiphilic polymer PVP-g-PVDF-g-DMF and preparation method and application thereof

An amphiphilic polymer, pvp-g-pvdf-g-dmf technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of pollution, difficult to control, easy to be washed off, etc. , to achieve the effect of stable process, reliable quality and uniform response

Inactive Publication Date: 2015-09-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these modification methods can improve the hydrophilicity of PVDF separation membranes to a certain extent, the modification treatment is often accompanied by some unavoidable shortcomings. , it is easy to be washed off; the operating conditions of plasma treatment are harsh and difficult to control; the operation process of chemical modification method is complicated, and there is a lot of pollution in production, so it is not suitable for large-scale industrial production

Method used

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  • Amphiphilic polymer PVP-g-PVDF-g-DMF and preparation method and application thereof
  • Amphiphilic polymer PVP-g-PVDF-g-DMF and preparation method and application thereof

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specific Embodiment approach 1

[0035] Embodiment 1: According to the ratio of mass parts PVDF:PVP:DMF=50:7-15:150-170, add PVDF resin powder and PVP powder into DMF solvent for mixing, and heat to 60 under sealed stirring condition -80°C, keep the constant temperature for 8-12 hours to completely dissolve the material mixture into a uniform solution, keep it in a sealed state and cool to room temperature, then use it as a radiation grafting system for gamma-ray irradiation treatment. Adopt one-step irradiation method to complete the irradiation grafting treatment according to the irradiation dose of 25.0 kGy and the irradiation dose rate of 6.0 KGy / h, and obtain modified materials containing the target product PVP-g-PVDF-g-DMF and its unreacted DMF system. Mix the grafted reaction material after irradiation treatment with the film-casting solution of unmodified PVDF resin according to the mass ratio of 10-50:100 to prepare a composite film-making solution. The casting solution was used for film formation, ...

specific Embodiment approach 2

[0039] Specific embodiment two: the difference between this embodiment and specific embodiment one is: two-step irradiation treatment is adopted, the irradiation dose of the first step irradiation grafting treatment is 5.0-10.0 kGy, and the irradiation dose rate is 5.0-5.5 KGy / h, this process is to realize the grafting reaction of PVDF and DMF to obtain the pre-product PVDF-g-DMF; on this basis, the second step of irradiation treatment is carried out, the irradiation dose is 7.5-18.0 kGy, and the irradiation dose rate is 6.6-7.5 KGy / h, this process is to realize the grafting reaction of the pre-product PVDF-g-DMF and PVP to form the double-grafted product PVP-g-PVDF-g-DMF. From the graft reaction material system after irradiation treatment, a small part is taken out for separation and purification to obtain the pure target product PVP-g-PVDF-g-DMF, and the infrared spectrum analysis of the product structure is shown in figure 1 , compared with the spectrum of unmodified pure P...

specific Embodiment approach 3

[0040] Specific embodiment three: the difference between this embodiment and specific embodiment one is: the components in the grafting system of specific embodiment one are prepared according to the following proportions to prepare two grafting systems, and grafting system 1 is composed of PVDF and DMF. Component composition, PVDF:DMF= 25:75-85, graft system 2 is composed of PVDF, PVP and DMF three components, PVDF:PVP:DMF= 25:7-15:75-85, using two-step radiation According to the treatment method, the first step is to irradiate the graft system 1, the irradiation dose is 5.0-10.0 kGy, and the irradiation dose rate is 5.0-5.5 KGy / h. This process is to realize the grafting reaction of PVDF and DMF to obtain Pre-product PVDF-g-DMF; the graft system 1 and graft system 2 after the first step of irradiation treatment are mixed evenly for the second step of irradiation treatment, the irradiation dose is 7.5-18.0 kGy, and the irradiation dose rate is 6.6-7.5 KGy / h, this process is to...

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Abstract

The invention discloses an amphiphilic polymer PVP-g-PVDF-g-DMF and a preparation method and application thereof. The amphiphilic polymer PVP-g-PVDF-g-DMF is prepared from PVDF resin which is a main component of a casting solution for a PVDF separation membrane, a super-hydrophilic solvent micromolecular N,N-dimethylformamide (DMF) and a hydrophilic macromolecular pore forming agent polyvinylpyrrolidone (PVP) by a high energy irradiation method; and the amphiphilic polymer can be used for preparing a hydrophilic modified PVDF membrane. The material components used for preparing the amphiphilic polymer are all from a material system for preparing a PVDF separation membrane, and no other substances are added; the obtained modified material system can be directly used without being separated or purified; and the irradiation grafting reaction process is pollution-free and environmentally-friendly, can be performed at room temperature, and is uniform in reaction, simple to operate, stable in process and reliable in quality, thereby being suitable for industrial production.

Description

technical field [0001] The invention relates to a polymer for improving the hydrophilicity of a PVDF separation membrane, a preparation method and application thereof. Background technique [0002] Because the surface of the unmodified PVDF separation membrane is mainly composed of chemically inert C-F bonds, showing low surface energy and hydrophobicity, the PVDF membrane is easy to adsorb organic substances in water during water treatment to pollute the membrane surface and membrane pore side walls. leading to a decrease in membrane separation performance. At present, many studies have proved that the fouling of the membrane will decrease with the increase of the hydrophilicity of the membrane. Some hydrophilic modification methods such as mixing method, coating method, plasma modification method and chemical modification method have been widely reported. Although these modification methods can improve the hydrophilicity of PVDF separation membranes to a certain extent, ...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08J5/18C08L27/16C08L87/00B01D71/34B01D67/00B01D69/02
Inventor 张春华刘雅薇刘超胡桢
Owner HARBIN INST OF TECH
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