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Novel hydrophilic hollow fiber membrane preparation method

A fiber membrane and hydrophilic technology, which is applied in the field of preparation of new hydrophilic hollow fiber membranes, can solve the problems of loss, loss of hydrophilicity of separation membranes, etc. Mild and controlled effects

Active Publication Date: 2014-03-26
DALIAN TINSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a water-soluble polymer, PVP will dissolve in water and be lost during the preparation and use of the separation membrane, resulting in the loss of the hydrophilicity of the separation membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026]In the preparation method of the novel hydrophilic hollow fiber membrane of the present invention, polyvinylpyrrolidone is hydrolyzed to obtain partially hydrolyzed modified polyvinylpyrrolidone; the obtained modified polyvinylpyrrolidone is blended with polymer materials, and the The hollow fiber membrane is prepared by the sedimentation method; after the membrane is formed, the hollow fiber membrane is crosslinked with a crosslinking agent to obtain a hydrophilic hollow fiber membrane with a crosslinked structure.

[0027] Among them, the hydrolysis treatment is to mix polyvinylpyrrolidone and water according to the mass ratio of 0.001 or 0.005 or 0.01 or 0.05 or 0.1 or 0.2 or 0.3 or 0.4 or 0.5︰1, that is, between 0.001-0.5︰1. °C or 35 °C or 40 °C or 50 °C or 60 °C or 70 °C or 80 °C or 90 °C or 100 °C, that is, the temperature can be between 20 and 100 °C, heated and refluxed in the presence of a catalyst to obtain Modified polyvinylpyrrolidone having carboxyl and amin...

Embodiment 1

[0038] Add 45g of PVP K30, 15g of sodium hydroxide, and 500mL of deionized water into a round-bottomed flask, heat and reflux at 90°C for 2 hours, then distill off the remaining water to obtain modified PVP (U-PVP 1), and dry it in vacuum. spare.

[0039] Add 45g of polysulfone and 18g of U-PVP 1 into 237g of DMAc, and mechanically stir at 80°C for 12 hours to make a casting solution. , after the degassing is completed, it enters the nozzle to spin the hollow fiber membrane. The spinning conditions are as follows:

[0040] Degassing tank pressure: 0.05MPa, degassing tank temperature 50°C, pipeline temperature 50°C, core liquid is water 68 drops / min, normal temperature, drafting speed: 1500m / h, gel bath: 25°C Dry spinning distance: 2 cm.

[0041] The hollow fiber membrane was prepared by gelling in deionized water, replaced with deionized water for 0.5 hours, and the inner and outer diameters were 0.72 / 0.96mm.

[0042] Soak the obtained hollow fiber membrane in a crosslinki...

Embodiment 2

[0045] Add 60g of PVP K30, 30g of sodium hydroxide, and 800mL of deionized water into a round-bottomed flask, heat and reflux at 95°C for 2 hours, then distill off the remaining water to obtain modified PVP (U-PVP 2), and dry it in vacuum. spare.

[0046] Add 54g of polyvinylidene fluoride, 24g of U-PVP 2, and 6g of ethylene glycol into 216g of DMAc, and at 80°C, mechanically stir for 12 hours to make a casting solution, filter it, and filter it until it is completely dissolved, and introduce the casting solution into In the degassing tank, vacuum degassing, after the degassing is completed, enter the nozzle to spin the hollow fiber membrane. The spinning conditions are as follows:

[0047] Degassing tank pressure: 0.12MPa, defoaming tank temperature 80°C, pipeline temperature 70°C, core fluid 98 drops / min of water, normal temperature, drafting speed: 1200m / h, dry spinning distance: 5cm.

[0048] The hollow fiber membrane was prepared by gelling in deionized water, replaced ...

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Abstract

The invention discloses a novel hydrophilic hollow fiber membrane preparation method, which comprises the following steps: firstly polyvinylpyrrolidone (PVP) is subjected to hydrolytic treatment to obtain partially hydrolyzed modified PVP; then the obtained modified PVP is blended with a polymer material, and the immersion and sedimentation method is adopted to prepare a hollow fiber membrane; finally a cross-linking agent is adopted to perform cross linking on the hollow fiber membrane after membrane forming so as to obtain a hydrophilic hollow fiber membrane with a cross-linking structure. According to the method, the reaction condition is mild and easy to control, and the operation is simple, convenient and safe; the modified raw materials are convenient and easy to obtain, and are low in cost; the stability of a hydrophilic modifier in the hollow fiber membrane is greatly improved after cross linking, and the hydrophilicity of the hollow fiber membrane is improved.

Description

technical field [0001] The invention relates to a preparation method of a hollow fiber membrane, in particular to a preparation method of a novel hydrophilic hollow fiber membrane. Background technique [0002] The membrane separation process has the following characteristics: (1) There is no interphase change, and the separation can be carried out at room temperature and low pressure, so its energy consumption is low; (2) The membrane separation process is generally a simple pressurized delivery fluid, and the process flow is simple , easy to operate and manage; (3) The equipment is small in size, simple in structure, and low in investment costs; (4) The substance does not undergo qualitative changes in the process of concentration and separation, so it is suitable for the treatment of flavor-preserving and heat-sensitive substances; (5) It is suitable for dilute Recovery of trace valuable macromolecular substances in the solution and concentration of low-concentration macr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/44B01D69/08B01D67/00
Inventor 高珺付晓燕于海军王科
Owner DALIAN TINSING TECH
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