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Poly(4-methyl-1-pentene) hollow fiber membrane with gradient pore structure and preparation method thereof

A gradient pore and pentene technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of continuous and stable production of high-performance poly hollow fiber membranes, affecting the safety of fiber membranes, and phase separation Difficulty in controlling crystallization behavior

Active Publication Date: 2021-02-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the melting temperature of poly(4-methyl-1-pentene) is close to the crystallization temperature, it is difficult to control the phase separation and crystallization behavior of poly(4-methyl-1-pentene) in the TIPS process. As for the difficulty in achieving continuous and stable production of high-performance poly(4-methyl-1-pentene) hollow fiber membranes, currently only 3M can provide poly(4-methyl-1-pentene) for ECMO Hollow Fiber Membrane Products
In addition, some of the above patent descriptions involve a variety of organic solvents that are toxic to the environment or the human body, which will greatly affect the safety of poly(4-methyl-1-pentene) hollow fiber membranes

Method used

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  • Poly(4-methyl-1-pentene) hollow fiber membrane with gradient pore structure and preparation method thereof
  • Poly(4-methyl-1-pentene) hollow fiber membrane with gradient pore structure and preparation method thereof
  • Poly(4-methyl-1-pentene) hollow fiber membrane with gradient pore structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of poly(4-methyl-1-pentene) hollow fiber gradient pore membrane is carried out through the following steps:

[0036] 1) Preparation of casting solution: mix poly(4-methyl-1-pentene) with a mass fraction of 25%, dibutyl adipate with a mass fraction of 70%, and propylene glycol with a mass fraction of 5% as Casting solution;

[0037] 2) Extrusion molding: Extrude the casting solution described in step 1) into a hollow fiber shape through a twin-screw extruder at 250°C at a speed of 80m / min;

[0038] 3) Phase separation and solidification: the hollow fiber described in step 2) is cooled in a water bath at a temperature of 30°C for 2 seconds after passing through an air section at 25°C for 10 ms, poly(4-methyl-1-pentene) / diluted The solvent system undergoes thermal-induced phase separation and non-solvent-induced phase separation at the same time, and then solidifies to form a film;

[0039] 4) extracting and removing the diluent: immersing the memb...

Embodiment 2

[0042] The mass fraction of poly(4-methyl-1-pentene) in the preparation of the casting solution in step 1) of Example 1 is increased to 30%, and the mass fractions of dibutyl adipate and propylene glycol are respectively reduced to 65.3% and 4.7% , with other conditions unchanged.

Embodiment 3

[0044] In step 1) of Example 1, dibutyl adipate was replaced by tributyl phosphate in the preparation of the casting solution, the mass fraction was reduced to 45%, the mass fraction of propylene glycol was increased to 30%, and other conditions remained unchanged.

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Abstract

The invention provides a method for preparing a poly(4-methyl-1-pentene) hollow fiber membrane with a gradient pore structure through coupling of a thermally induced phase separation method and a non-solvent induced phase separation method. The method comprises the following steps: uniformly mixing poly(4-methyl-1-pentene) and a diluent at high temperature, and carrying out extrusion to realize one-shot molding; after the formed mixture passes through an air section, allowing the mixture to enter a cooling bath for cooling so as to realize thermally induced phase separation and non-solvent phase separation; and finally, extracting the diluent to obtain the hollow fiber membrane. The hollow fiber membrane prepared by the method provided by the invention has improved safety, and the thermally induced phase separation process and the non-solvent induced phase separation process in a poly(4-methyl-1-pentene) diluent system are easy to regulate and control, so the poly(4-methyl-1-pentene) membrane with better mechanical strength, gas permeability and plasma infiltration resistance is obtained. The invention also provides the poly(4-methyl-1-pentene) hollow fiber membrane and applicationthereof in the field of artificial membrane lungs.

Description

technical field [0001] The invention relates to a poly(4-methyl-1-pentene) hollow fiber membrane with a gradient pore structure and a preparation method, in particular to the preparation of a poly(4-methyl-1-pentene) hollow fiber membrane with a gradient pore structure by adopting a thermally induced phase separation method and a non-solvent phase separation integration process Process for poly(4-methyl-1-pentene) hollow fiber membranes and hollow fiber membranes produced by the process. Background technique [0002] Extracorporeal Membrane Oxygenation (ECMO) system, which replaces the function of human lungs to regulate the oxygen and carbon dioxide levels in the blood, has become an important medical treatment for acute respiratory diseases, waiting for lung transplantation and cardiovascular surgery. equipment. ECMO consists of membrane oxygenator, blood pump, gas mixer, various pipelines and monitors. Membrane oxygenator is the key place for gas-blood exchange and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D67/00B01D69/08
CPCB01D71/26B01D69/08B01D67/0011
Inventor 林亚凯汪林王晓琳
Owner TSINGHUA UNIV
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