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Modified polyvinylidene fluoride material as well as preparation method and application thereof in hollow fiber membrane material

A technology of polyvinylidene fluoride and vinylidene fluoride, which is applied in the field of modified polyvinylidene fluoride materials, preparation and application in hollow fiber membrane materials, can solve the problem of decreased hydrophilicity, unsatisfactory modification effect, and improved The effect of hydrophilicity is limited and not durable

Inactive Publication Date: 2010-11-03
CHENGDU SHUIMOFANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification methods of these membranes are all limited to modifying the surface of the membrane after the hollow fiber membrane is formed. The disadvantage is that the grafting rate is low and the modification effect is not ideal. , high toughness, high anti-pollution and other comprehensive requirements
[0006] The Chinese patent document with the publication number CN1687222A provides a polyvinylidene fluoride modified membrane and its preparation method. The hydrophilic property of the membrane is improved by adding titanium dioxide to PVDF, but the effect of improving the hydrophilicity is limited and not lasting. During the application process, it was found that the titanium dioxide in the material will be gradually removed, resulting in a gradual decrease in the hydrophilicity during use.

Method used

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  • Modified polyvinylidene fluoride material as well as preparation method and application thereof in hollow fiber membrane material
  • Modified polyvinylidene fluoride material as well as preparation method and application thereof in hollow fiber membrane material
  • Modified polyvinylidene fluoride material as well as preparation method and application thereof in hollow fiber membrane material

Examples

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Embodiment Construction

[0022] 1. Comparative example: prepare hollow fiber membrane according to the current traditional method

[0023] 1. Stir PVDF and solvent at a constant temperature of 90°C for 10 hours at a high speed, add a pore-forming agent and continue stirring for 12 hours, then statically defoam to obtain a casting solution. Membranes are formed after spinning, shearing and post-treatment in a conventional manner, and the compositions of coagulation liquid and core liquid are changed to obtain internal (external) pressure hollow fiber membranes. The inner diameter of the membrane filament is 0.6-0.8 mm, and the wall thickness is 0.2-0.4 mm.

[0024] The raw materials and consumption etc. of each comparative example are shown in Table 1.

[0025] Raw materials and consumption of each comparative example of table 1

[0026]

[0027] Two, the modified PVDF material embodiment of the present invention

[0028] Stir the PVDF or vinylidene fluoride copolymers corresponding to the compar...

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Abstract

The invention relates to a modified polyvinylidene fluoride material as well as a preparation method and application thereof in a hollow fiber membrane material. The modified polyvinylidene fluoride material comprises a polyvinylidene fluoride or vinylidene fluoride copolymer and modified components, wherein the mass ratio of the polyvinylidene fluoride or vinylidene fluoride copolymer is 70 to 90 percent, and the balance is the modified components; the vinylidene fluoride copolymer is a copolymer in which the vinylidene fluoride is copolymerized with at least one of vinyl fluoride or hexafluoropropylene component and the vinylidene fluoride chain link unit content in the structure is not less than 60 percent. The modified material can effectively solve the problems that the PVDF (Polyvinylidene Fluoride) hollow fiber membrane has low hydrophilicity, poor physical and mechanical properties, such as strength, toughness, and the like and insufficient stain resistance, and the like, further obtain the composite modified material which is used for manufacturing hollow fiber membranes with high strength, high flux, high toughness and high stain resistance, and satisfy the treatment requirements of various water qualities, in particular wastewater quality.

Description

technical field [0001] The invention relates to a modified polyvinylidene fluoride material which can be used as a raw material for preparing hollow fiber membranes, a preparation method thereof and an application in hollow fiber membrane materials. Background technique [0002] In the field of water treatment, the membrane separation process with the advantages of high efficiency, energy saving, simple process, easy operation and control, and no pollution to the environment has been widely used, and it can have different forms such as flat membrane and hollow fiber membrane. [0003] Polyvinylidene fluoride (PVDF) is currently the main material for preparing such membrane materials, especially hollow fiber membranes. PVDF is a linear polymer obtained by homopolymerization or copolymerization of vinylidene fluoride monomer. This material has the characteristics of high strength, high rigidity, high impact resistance, abrasion resistance, temperature resistance and weather re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K5/09C08K5/42C08K5/20C08F8/00C08F114/22C08F214/22B01D63/00
Inventor 徐正华雷霆邱克薛兰波
Owner CHENGDU SHUIMOFANG TECH
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