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Preparation method for hydrophilia polyvinylidene fluoride hollow fiber membrane

A polyvinylidene fluoride and fiber membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as adsorption, solve easy agglomeration, improve hydrophilic persistence, and improve compatibility sexual effect

Active Publication Date: 2013-11-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a hydrophilic polyvinylidene fluoride hollow fiber membrane to overcome the problem that pollutants are easily adsorbed on the surface of the membrane and in the pores of the membrane

Method used

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  • Preparation method for hydrophilia polyvinylidene fluoride hollow fiber membrane
  • Preparation method for hydrophilia polyvinylidene fluoride hollow fiber membrane
  • Preparation method for hydrophilia polyvinylidene fluoride hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Dissolve the silane coupling agent (KH570) in water and ethanol solution with a volume ratio of 1 / 9, and prepare a solution with a mass concentration of 9.0%. SiO 2 After the addition of the powder (2 parts), the temperature was gradually raised to 90° C., and the stirring was continued for 3.0 h. Cool down to room temperature and then dry.

[0048] (2) 20 parts of MPEG and 0.161 parts of phase transfer agent tetrabutylammonium bromide (TBAB), dissolved in 50 parts of toluene at 50°C, 14 parts of sodium hydroxide (NaOH), added 4-vinyl under vigorous stirring 0.763 parts of benzyl chloride, the temperature was raised to 65°C, after 5 hours of reaction, cooled to room temperature, 100 parts of extractant dichloromethane was added, the solution was filtered, and then the dichloromethane was removed by rotary evaporation. The product was purified by repeated dissolution with dichloromethane and precipitation in anhydrous ether. The product was dried in a vacuum oven ...

Embodiment 2

[0052] (1) Dissolve the silane coupling agent (A-171) in water and ethanol solution with a volume ratio of 1 / 8, and prepare a solution with a mass concentration of 8.0%. After it is completely dispersed, slowly add it dropwise and stir at high speed at room temperature Quantitative TiO 2 After the addition of the powder (3 parts), the temperature was gradually raised to 100° C., and the stirring was continued for 4.0 h. Cool down to room temperature and then dry.

[0053] (2) 25 parts of MPEG and 0.363 parts of phase transfer agent tetrabutylammonium bromide (TBAB), dissolved in 50 parts of benzene at 55 °C, 60 parts of sodium hydroxide (NaOH), added 4-vinyl under vigorous stirring 19 parts of benzyl chloride, the temperature was increased to 80°C, after 6 hours of reaction, cooled to room temperature, 250 parts of extractant dichloromethane was added, the solution was filtered, and then the dichloromethane was removed by rotary evaporation. The product was purified by repea...

Embodiment 3

[0057] (1) Dissolve the silane coupling agent (KH570) in water and ethanol solution with a volume ratio of 1 / 6, and prepare a solution with a mass concentration of 7.0%. Al 2 o 3 After the addition of the powder (1 part), the temperature was gradually raised to 100° C., and the stirring was continued for 3.0 h. Cool down to room temperature and then dry.

[0058] (2) 30 parts of MPEG and 0.256 parts of phase transfer agent tetrabutylammonium bromide (TBAB), dissolved in 60 parts of toluene / dichloromethane (mass ratio 1:9) at 50 ° C, sodium hydroxide (NaOH) 60 Parts, 15.2 parts of 4-vinylbenzyl chloride was added under vigorous stirring, the temperature was raised to 62 ° C, after 5.5 hours of reaction, cooled to room temperature, 280 parts of extractant dichloromethane was added, and the solution was filtered, then rotary evaporation to remove dichloromethane Chloromethane. The product was purified by repeated dissolution with dichloromethane and precipitation in anhydrous...

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Abstract

The invention relates to a preparation method for a hydrophilia polyvinylidene fluoride hollow fiber membrane. The preparation method comprises the following steps of: (1) dissolving hydrogen-terminated silicone oil and vinyl-terminated methoxy polyethylene glycol into methylbenzene, adding a Pt (platinum) catalyst, and reacting so as to obtain an amphiphilic polymer; (2) adding a nanometer oxide processed by a silane coupling agent into the methylbenzene, and then adding the amphiphilic polymer and the Pt catalyst so as to react to obtain an amphiphilic polymer grafted nanometer oxide particle; (3) mixing the polyvinylidene fluoride, a composite diluent and the amphiphilic polymer grafted nanometer oxide particle so as to prepare a membrane casting liquid, then extruding the membrane casting liquid through a spinning jet so as to obtain a primary hollow fiber, solidifying through a coagulating bath, stretching and retracting so as to obtain a primary hollow fiber membrane, then extracting, performing soak cleaning, and finally processing through a pore former so as to obtain the hydrophilia polyvinylidene fluoride hollow fiber membrane. The preparation method is simple, the purpose of hydrophilic modification is achieved by mixing modified nanometer oxide particles, and the antifouling property of the membrane is improved finally.

Description

technical field [0001] The invention belongs to the field of preparation of hollow fiber membranes, in particular to a method for preparing a hydrophilic polyvinylidene fluoride hollow fiber membrane. Background technique [0002] As a new type of membrane material, polyvinylidene fluoride (PVDF) has excellent chemical stability, thermal stability, ultraviolet radiation resistance and sufficient mechanical strength, and has been widely used in membrane water resource utilization technology. Polyvinylidene fluoride hollow fiber membrane has the characteristics of no energy consumption, green environmental protection, high filtration accuracy, can filter out all bacteria, viruses, rust and other substances, and can retain the trace elements necessary for human body. In recent years, it has been widely used in microfiltration, ultrafiltration, membrane distillation, gas separation, seawater desalination, etc. [0003] However, most of the currently commercialized polyvinyliden...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 何春菊秦爱文徐建峰
Owner DONGHUA UNIV
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