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Hydrophilic modification method of PVDF multihole film

A hydrophilic modification, porous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of strong hydrophobicity, easy pollution, low water flux, etc. , good compatibility, strong hydrophilic effect

Inactive Publication Date: 2015-04-22
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problems of strong hydrophobicity of PVDF porous membrane, large driving force required in the separation process, low water flux, and easy pollution during use, and provides a hydrophilic modification method of PVDF porous membrane

Method used

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  • Hydrophilic modification method of PVDF multihole film
  • Hydrophilic modification method of PVDF multihole film
  • Hydrophilic modification method of PVDF multihole film

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specific Embodiment approach 1

[0026] Specific embodiment one: the hydrophilic modification method of the present embodiment PVDF porous film is as follows:

[0027] 1. Put 2-acrylamide-2-methylpropanesulfonic acid in a beaker, add dimethylformamide, and stir to obtain 2-acrylamide-2-methylpropanesulfonic acid with a mass concentration of 20-40%. solution;

[0028] 2. Add methyl methacrylate to the solution obtained in step 1 according to the ratio of 2-acrylamido-2-methylpropanesulfonic acid to methyl methacrylate, and then add Azobisisobutyronitrile, the amount of azobisisobutyronitrile added is 5‰-1% of the total mass of 2-acrylamide-2-methylpropanesulfonic acid and methyl methacrylate to obtain a reaction system;

[0029] 3. Heat the reaction system to 65-75°C, then stir for 5 hours while heating at 65-75°C, cool to room temperature, and distill under reduced pressure to obtain a polymer solution after vacuum distillation;

[0030] 4. Pour the polymer solution after vacuum distillation into a precipit...

specific Embodiment approach 2

[0035] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass concentration of 2-acrylamide-2-methylpropanesulfonic acid in the solution described in step 1 is 25%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the addition of azobisisobutyronitrile described in step two is 2-acrylamide-2-methylpropanesulfonic acid and methane 0.5% of the total mass of methyl acrylate. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a hydrophilic modification method of a PVDF multihole film, relates to a film modification method, belongs to the field of multihole film modifying, and aims at solving the technical problems that the PVDF multihole film is high in hydrophobicity, the driving force needed in the separating process is large, the water flux is low, and the PVDF multihole film is contaminated easily in the using process. The hydrophilic modification method comprises the following steps that a solution with the mass concentration of 2-acrylamide-2-methyl propanesulfonic acid ranging from 20 percent to 40 percent is prepared, methyl methacrylate and azodiisobutyronitrile are added to the solution, and a reaction system is obtained; the reaction system is heated, reduced pressure distillation is carried out, the reaction system is poured into precipitator, precipitate is obtained and dried, and copolymer is obtained; the copolymer, polyvinylidene fluoride and polyvinylpyrrolidone are added to dimethylformamide to be stirred and cooled to the indoor temperature, the mixture is subjected to standing, and casting film liquid is obtained; the casting film liquid is poured to a glass plate on a film laying machine for film laying, the casting film liquid is dried, and then the PVDF multihole film is obtained. The modified PVDF multihole film is high in hydrophilia.

Description

technical field [0001] The invention relates to a method for modifying a thin film. Background technique [0002] Water is the foundation of life and an essential condition for human survival and development. In recent years, with the rapid development of social economy, my country's annual urban sewage discharge has reached more than 20 billion cubic meters, while the sewage treatment rate is less than 10%. Some northern heavy industrial cities and southeast coastal cities suffer from water shortages and environmental pollution. The problem is more prominent. Therefore, it is of great practical significance to improve the recycling level of water resources and promote the development of water treatment technology. [0003] Using membrane technology for water treatment, using the characteristics that water molecules in the aqueous solution (raw water) can pass through the separation membrane, but solutes or other impurities cannot pass through the separation membrane, and t...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/02
Inventor 崔巍巍徐文华刘京强姜洋刘慧慧刘立柱
Owner HARBIN UNIV OF SCI & TECH
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