Polyvinylidene fluoride hollow fiber ultrafiltration membrane with permanent hydrophilcity and preparation method thereof

A polyvinylidene fluoride and ultrafiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of not seeing articles and reports, not seeing the production of hydrophilic membrane products, etc.

Inactive Publication Date: 2010-05-26
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of polar monomer grafted modified polymer solution to prepare the casting solution to prepare hydrophilic ultrafiltration membranes has not seen the production of similar hydrophilic membrane products in my country, nor have we seen published articles and reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 17% (w / w) polyvinylidene fluoride, 70% (w / w) dimethylacetamide, 12% (w / w) polyethylene glycol and 1% (w / w) surfactant The agents were added into the dissolution tank in a certain order, and stirred and dissolved at 80°C for 6 hours until fully uniform. Maintain the temperature of the dissolution tank, add ammonium persulfate with a mass of 0.5% (w / w) of the polar monomer as an initiator, stir for 30 minutes until uniform, and then slowly add a polar monomer with a mass of 2% (w / w) of the casting solution. Bulk acrylic acid, and continue to stir and react for 8 hours at the dissolution temperature of polyvinylidene fluoride. Then, the obtained spinning solution was statically defoamed at the reaction temperature for 24 hours to remove the remaining air bubbles in the spinning solution.

[0014] Control the flow rate of the spinning solution to 8.0mL / min, the temperature of the spinning solution is 80°C, the temperature of the coagulation bath is 45°C, the height of the ...

Embodiment 2

[0016] Polar monomer is changed into maleic anhydride by acrylic acid, and all the other are with embodiment 1. Then the pure water permeability coefficient of the obtained hydrophilic polyvinylidene fluoride hollow fiber ultrafiltration membrane is 235L / m 2 ·hr·MPa, the rejection rate of bovine serum albumin (67000MW) is 98.6%, the elongation at break is 207%, and the burst pressure is 0.58MPa.

Embodiment 3

[0018] The time for the polar monomer acrylic acid to participate in the grafting reaction was reduced from 8 hours to 6 hours, and all the others were the same as in Example 1. Then the pure water permeability coefficient of the obtained hydrophilic polyvinylidene fluoride hollow fiber ultrafiltration membrane is 186L / m2 ·hr·0.1MPa, the retention rate of bovine serum albumin (67000MW) is 98.2%, the elongation at break is 185%, and the bursting pressure is 0.53MPa.

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Abstract

The invention discloses a polyvinylidene fluoride hollow fiber ultrafiltration membrane with permanent hydrophilcity and a preparation method thereof. The preparation method comprises the following steps of: sequentially adding 13 wt% to 25 wt% of polyvinylidene fluoride, 8 wt% to 16 wt% of additives and 0.02 wt% to 3.0 wt% of surface active agents and solvents in a dissolving tank, and then stirring for dissolving for 2 to 16 hours at 15 to 90 DEG C to the fully uniform state to prepare that initial membrane casting liquid; sequentially adding initiating agents accounting for 0.1 wt% to 3.5 wt% of polar monomers and the polar monomers accounting for 0.1 wt% to 5.0 wt% of the membrane casting liquid in the membrane casting liquid, and reacting for 1 to 12 hours at 15 to 90 DEG C to prepare hydrophilic membrane casting liquid; and preparing the hydrophilic hollow fiber ultrafiltration membrane by adopting the traditional dry-wet spinning technology. For the hydrophilic polyvinylidene fluoride hollow fiber ultrafiltration membrane prepared in the preparation method, the pure water permeability coefficient is greater than 230 L/m2*hr*0.1MPa, the retention rate of bovine serum albumin (67000MW) is greater than 95.0%, the breaking elongation rate of fibers is greater than 200%, and the fracture pressure is greater than 0.55 MPa. The polyvinylidene fluoride hollow fiber ultrafiltration membrane with permanent hydrophilcity is especially suitable for deep treatment and recycling of waste water, clarification and separation in the fields of biochemical engineering and medicament, and the like.

Description

Technical field: [0001] The invention relates to a polymer ultrafiltration membrane and a preparation method thereof, in particular to a polyvinylidene fluoride hollow fiber ultrafiltration membrane with permanent hydrophilicity and a preparation method thereof. Background technique: [0002] Polyvinylidene fluoride (PVDF) is a crystalline polymer with good chemical stability, heat resistance, mechanical stability, and can be dissolved in some strong polar organic solvents at low temperatures, easy to Membrane made by phase inversion method is a new type of polymer membrane material with excellent performance. In recent years, PVDF separation membrane has been successfully used in many fields such as chemical industry, food, medicine and biochemistry. However, due to the hydrophobicity of the surface of polyvinylidene fluoride and other hydrophobic membranes, there are disadvantages such as water not easily permeating the membrane channel, easy to be polluted by organic matt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 王立国刘思全王秀菊张晓光陈永芳寇广云刘文娟
Owner UNIV OF JINAN
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