Production method of thermoplastic high-molecular material hollow fiber micro-pore membrane

A thermoplastic polymer and production method technology, applied in the field of membrane separation, can solve the problems of difficult selection of phase components, large environmental pollution, etc., and achieve the effects of uniform pore size distribution, strong mechanical properties, and low cost

Inactive Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hollow fiber membrane is prepared by thermally induced phase separation, the process is relatively simple, and the membrane structure is easy to control, but the selection of phase components is difficult and the environmental pollution is relatively large.
[0007] It can be seen from the above that the existing hollow fiber membrane production technology still has various deficiencies and needs further research and development.

Method used

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  • Production method of thermoplastic high-molecular material hollow fiber micro-pore membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Blend low-melting-point high-viscosity PET and CAB at a ratio of 25-40% (the weight percentage of CAB, the same below), spun into untwisted yarn at a temperature of 195-240°C, and then spun at a temperature of 95-130°C Stretching and heat treatment at 160-180°C to make PET / CAB blended hollow fiber, then place it in acetone at room temperature to dissolve the CAB in it, and obtain a hollowness of 30-45% and a porosity of 26-42 % PET hollow fiber microporous membrane.

Embodiment 2

[0025] PTT and CAB are blended at a ratio of 30-40%, spun into untwisted yarn at a temperature of 185-215°C, then drawn at 85-115°C, and heat-treated at 150-170°C to make PTT / CAB The hollow fiber is blended, and then placed in acetone at room temperature to dissolve the CAB in it to obtain a PTT hollow fiber microporous membrane with a hollowness of 35-45% and a porosity of 40-45%.

Embodiment 3

[0027] PBT and CAB are blended at a ratio of 25-35%, spun into untwisted yarn at a temperature of 190-220°C, then drawn at 80-100°C, and heat-treated at 140-155°C to make PBT / CAB The hollow fiber is blended, and then placed in acetone at room temperature to dissolve the CAB in it to obtain a PBT hollow fiber microporous membrane with a hollowness of 30-45% and a porosity of 28-32%.

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Abstract

The invention relates to a production method of a thermoplastic high-molecular material hollow fiber micro-pore membrane and belongs to the technical field of membrane separation. The method includes the following steps: 1) mixing a thermoplastic high-molecular material and CAB, of which the melting points are similar; 2) spinning the mixture through melt spinning method at 180-240 DEG C to prepare untwisted yarns; 3) drafting the untwisted yarns at 80-130 DEG C; 4) performing thermal treatment at 140-180 DEG C to obtain thermoplastic high-molecular material/CAB blended hollow fibers; and 5) placing the blended hollow fibers in acetone to dissolve the CAB phase to prepare the thermoplastic high-molecular material hollow fiber micro-pore membrane which is 30-45% in hollowness degree and 40-55% in porosity. The hollow fiber micro-pore membrane is high in porosity, is uniform in pore size distribution, is strong in mechanical performance and excellent in filtering performance, is low in processing cost, has a high additional value, is environment-friendly, and is an excellent basic material for the field of membrane separation.

Description

technical field [0001] The invention relates to a processing and production method for a hollow fiber microporous membrane of a thermoplastic polymer material, and belongs to the technical field of membrane separation. Background technique [0002] Hollow fiber microporous membrane is a self-supporting separation membrane with a fiber-like shape and a large number of micropores penetrating the hollow cavity of the fiber distributed on the fiber wall. It is an important variety in the field of membrane separation technology. The fiber wall of the hollow fiber microporous membrane has selective permeability, which allows some components in the gas and liquid mixture to pass through the hollow fiber wall from the inner cavity to the outside or from the outer to the inner cavity, while retaining other components. effect. [0003] As an important membrane separation technology, the hollow fiber membrane has good pressure resistance, easy backwashing, no support, high strength, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/48B01D71/26B01D67/00B01D69/08
Inventor 吕洪王栋刘传生李沐芳
Owner CHINA PETROLEUM & CHEM CORP
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