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Non-crystallization permanent hydrophilic PVDF membrane material and preparation method thereof

A technology of polyvinylidene fluoride membrane and polyvinylidene fluoride, applied in the field of hydrophilic polyvinylidene fluoride membrane material and its preparation, can solve the problem of affecting the permeability of membrane materials, high viscosity of polymer solutions, and long-term instability of solutions and other problems to achieve the effect of reducing the frequency of replacement, improving the performance and avoiding the reduction of strength

Inactive Publication Date: 2008-09-24
南京奥特高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of the strength of membrane materials, polyvinylidene fluoride is easy to stretch and has a low Young's modulus. One of the solutions to obtain high-strength membrane materials is to increase the concentration of high molecules. High polymer concentration will bring technical difficulties to the preparation of membrane materials: the high polymer solution viscosity is high, the solution is unstable for a long time, and gel is prone to occur, and the crystallinity after film formation is too high, resulting in too low strength of the membrane material. Too high a molecular concentration directly affects the permeability of the membrane material

Method used

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  • Non-crystallization permanent hydrophilic PVDF membrane material and preparation method thereof
  • Non-crystallization permanent hydrophilic PVDF membrane material and preparation method thereof
  • Non-crystallization permanent hydrophilic PVDF membrane material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 20 grams of polyvinylidene fluoride and 15 grams of long-chain polyvinylpyrrolidone (K120) were dissolved in a mixed solvent of 65 grams of dimethylacetamide and 8 grams of ethylene glycol at 80° C. with thorough stirring. After the polymer was completely dissolved, it was filtered through a stainless steel mesh with a pore size of 40 microns and left to stand in an oven at 100°C for defoaming. The proximity ratio α of the solution is 0.8. Using a stainless steel spatula with a thickness of 300 microns, the polymer solution was applied to a glass plate, placed in air (22°C, relative humidity 50%) for about 2 seconds, then immersed in 60°C water for phase separation and solidification. After the membrane material is completely cured, take out the membrane material for further cleaning. After cleaning, the membrane material was immersed in a hydrogen peroxide solution with a concentration of 5000ppm for 48 hours for post-treatment, and then the pure water permeability of...

Embodiment 2

[0038] Prepare the same polyvinylidene fluoride solution as in Example 1. After filtering and defoaming, use a stainless steel spatula with a thickness of 300 microns to apply the polymer solution to a glass plate and place it in the air (20°C, relative humidity 50%) Place in the middle for about 2 seconds and then immerse in water at 20°C for phase separation and solidification. After the membrane material is completely cured, take out the membrane material for further cleaning. The membrane material after cleaning adopts the method identical with above-mentioned embodiment to carry out post-treatment, then the pure water permeability of measuring polyvinylidene fluoride membrane is 70L m -2 ·hr -1 · bar -1 . SEM structure observation revealed polyvinylidene fluoride crystalline structures on the surface and bottom of the film. The measured crystallinity of the film material is 0.3, the breaking strength in the tensile test is 3.5 Newton, and the breaking elongation is 15...

Embodiment 4

[0046] 20 grams of polyvinylidene fluoride, 15 grams of long-chain polyvinylpyrrolidone (K30), dissolved in 65 grams of dimethylacetamide solvent and mixed with 8 grams of ethanol at 80 ° C under full stirring, the proximity ratio of the solution α is 0.95 . After the polymer was completely dissolved, it was filtered through a stainless steel mesh with a pore size of 40 microns, and then left to defoam in an oven at 50°C. Using a stainless steel spatula with a thickness of 300 microns, the polymer solution was applied to a glass plate, placed in air (20°C, relative humidity 50%) for about 2 seconds, and then immersed in 60°C water for phase separation and solidification. After the membrane material is completely cured, take out the membrane material for further cleaning. After cleaning, the membrane material was immersed in a hydrogen peroxide solution with a concentration of 5000ppm for 48 hours for post-treatment, and then the pure water permeability of the polyvinylidene f...

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Abstract

The invention relate to a non-crystallization type permanent hydrophilic polyvinylidene fluoride material and the preparation method thereof. The invention adopts crystalline non-crystallization type polyvinylidene fluoride macromolecules, mixes the polyvinylidene fluoride macromolecule with long chain hydrophilic or long chain hydrophilic and noncrystalline hydrophobic macromolecules; thus, the polyvinylidene fluoride macromolecules and water-soluble long chain macromolecules physical cross-linking are formed in polar excellent solvent, and liquid-liquid phase separation is realized via adding micromolecule addictives and improving the temperature of coagulation bath at the same time to speed up the phase separation of the macromolecules; after treatment, the permanent hydrophilic membrane material is obtained, the membrane material is mainly formed by amorphous macromolecule material, the crystallinity of the material is 0 to 0.4; the water contact angle is 0 to 50 degrees with permanent hydrophilicity.

Description

technical field [0001] The invention discloses a hydrophilic polyvinylidene fluoride membrane material and a preparation method thereof; in particular, a high-strength, permanently hydrophilic polyvinylidene fluoride membrane material structure and its preparation with a non-crystalline or amorphous structure method. technical background [0002] In recent years, porous organic membrane materials have performed well in the treatment of industrial wastewater and municipal sewage. Due to the substantial reduction in the manufacturing cost of membrane materials and the gradual maturity of sewage treatment technologies such as membrane bioreactor technology, membrane technology has become the most important in environmental protection. one of the technologies. Membrane material sewage treatment mainly includes two processes: the first is to use conventional activated sludge water treatment technology to consume organic matter in sewage, then settle, and finally filter out bacte...

Claims

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Application Information

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IPC IPC(8): B01D71/34
Inventor 何涛李雪梅殷勇
Owner 南京奥特高科技有限公司
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