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Preparation method of hollow fibrous membrane, hollow fibrous membrane, and latent solvent composition

A fiber membrane, latent solvent technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as inability to obtain narrowly distributed pore structure, reduced membrane mechanical properties and chemical resistance, and dense skin layer thickness.

Active Publication Date: 2014-02-12
博天环境规划设计研究院(北京)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Polysulfone and polyethersulfone hollow fiber membranes are generally prepared by the non-solvent-induced phase separation method. A large proportion of solvent is added to the membrane-making solution, and there are large finger-like pore structures inside the prepared hollow fiber membranes, and the dense skin layer is too thick, so it is impossible to obtain Narrowly distributed pore structure, resulting in low membrane strength, water flux and compression resistance
However, the spherical particle structure leads to a decrease in the mechanical properties and chemical resistance of the membrane.

Method used

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  • Preparation method of hollow fibrous membrane, hollow fibrous membrane, and latent solvent composition
  • Preparation method of hollow fibrous membrane, hollow fibrous membrane, and latent solvent composition
  • Preparation method of hollow fibrous membrane, hollow fibrous membrane, and latent solvent composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add the dried 20wt% polyethersulfone, 65wt% γ-butyrolactone and ε-caprolactam mixed latent solvent, and 15wt% glycerol non-solvent into the stirring tank, wherein the latent solvent γ-butyrolactone: ε - Caprolactam = 3 / 1.

[0039] The above mixture was stirred for 18 hours at a temperature of 120° C. at a rotation speed of 100 rpm, and vacuum defoamed at a temperature of 120° C. for 12 hours to obtain a homogeneous film-forming solution.

[0040] Keep the film-making liquid at 120°C and pass through a 250-mesh filter before entering the intubation spinneret and spraying out together with the core liquid in the center tube of the nozzle. The core fluid consisted of 60 wt% deionized water, 25 wt% γ-butyrolactone and 15 wt% glycerol. The sprayed film-forming liquid passes through a 10cm air section and enters a cooling bath at 10°C. The cooling bath is composed of 40wt% deionized water, 30wt% γ-butyrolactone and 30wt% glycerol, and the spinning speed is 15m / min. The obta...

Embodiment 2

[0046] Add the dried 21wt% polyethersulfone, 65wt% γ-butyrolactone and ε-caprolactam mixed latent solvent, and 14wt% ethylene glycol non-solvent into the stirring tank, wherein the latent solvent γ-butyrolactone: ε - caprolactam = 1 / 3.

[0047] The above mixture was stirred for 36 hours at a temperature of 150° C. at a rotational speed of 100 rpm, and vacuum defoamed at a temperature of 150° C. for 6 hours to obtain a homogeneous film-forming solution.

[0048] Keep the film-making liquid at 150°C and pass through a 250-mesh filter before entering the intubation spinneret and spraying out together with the core liquid in the center tube of the nozzle. The core fluid consisted of 80 wt% deionized water, 10 wt% γ-butyrolactone and 10 wt% ethylene glycol. The sprayed film-making liquid passes through a 15cm air section and enters a cooling bath at 25°C. The cooling bath is composed of 60wt% deionized water, 20wt% γ-butyrolactone and 20wt% ethylene glycol, and the spinning speed ...

Embodiment 3

[0053] Add the mixed latent solvent of 30wt% polysulfone, 57wt% gamma-butyrolactone and epsilon-caprolactam, 13wt% tetraethylene glycol non-solvent into the stirring tank, wherein the latent solvent gamma-butyrolactone: epsilon- Caprolactam = 1 / 1.

[0054] The above mixture was stirred for 24 hours at a temperature of 130° C. at a rotational speed of 100 rpm, and vacuum defoamed at a temperature of 130° C. for 8 hours to obtain a homogeneous film-forming solution.

[0055] Keep the film-making liquid at 130°C and pass through a 250-mesh filter before entering the intubation spinneret and spraying out together with the core liquid in the center tube of the nozzle. The core fluid consisted of 60wt% deionized water, 20wt% γ-butyrolactone and 20wt% tetraethylene glycol. The sprayed film-forming liquid passes through a 20cm air section and enters a cooling bath at 15°C. The cooling bath is composed of 50wt% deionized water, 25wt% γ-butyrolactone and 25wt% tetraethylene glycol. The...

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Abstract

The invention relates to a preparation method of a polysulfone or polyether sulfone hollow fibrous membrane, a latent solvent composition and the polysulfone or polyether sulfone hollow fibrous membrane. The preparation method comprises the following steps: preparing the polysulfone or polyether sulfone, the latent solvent composition and a non-solvent into a homogenous film-forming solution; introducing the film-forming solution together with a core solution into a cooling bath through an intubation-tube sprayer, separating composite phase to obtain a polysulfone or polyether sulfone hollow fibrous membrane; removing the latent solvent composition or non-solvent from the hollow fibrous membrane, thus obtaining the hollow fibrous membrane. The latent solvent composition is one or mixture of more selected from gamma-butyrolactone, epsilon-caprolactone, epsilon-hexanolactam, triethyl phosphate and tetramethylurea. The hollow fibrous membrane has high density, high separation precision, high flux and excellent chemical resistance.

Description

technical field [0001] The invention relates to a hollow fiber membrane and a preparation method thereof, in particular to a polysulfone or polyethersulfone hollow fiber membrane and a preparation method thereof. The hollow fiber membrane has high strength, high separation precision, high flux and excellent chemical resistance performance. Background technique [0002] Membrane separation technology is widely used in chemical, food, pharmaceutical, municipal and electronic fields. [0003] The main polymer materials for membrane making are cellulose acetate, polyacrylonitrile, polyvinyl chloride, polysulfone, polyvinylidene fluoride and polyethersulfone. [0004] Film-making methods include melt-stretching method, sintering method, non-solvent-induced phase separation method and thermal-induced phase separation method, among which the most important film-making methods are non-solvent-induced phase separation method and thermal-induced phase separation method. [0005] Mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/68B01D67/00
Inventor 周钱华赵亮
Owner 博天环境规划设计研究院(北京)有限公司
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