Fibre membrane with porous structure and production thereof

A technology of porous structure and fiber membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as low strength, inability to meet the needs of the development of sewage treatment, and small specific surface area

Inactive Publication Date: 2005-10-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, most of the fiber membranes currently used for sewage treatment are single-hole hollow fiber membranes and flat-plate membranes. Most of the membranes used in

Method used

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  • Fibre membrane with porous structure and production thereof
  • Fibre membrane with porous structure and production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 35 grams of polyvinylidene fluoride of FR904 type and 5 grams of polyethylene glycol are dissolved in 60 grams of N, N-dimethylacetamide solvent, and then the dry-wet spinning method known in the art is used to obtain a porous structure fibrous membranes, such as figure 1 and figure 2 shown.

[0027] The dissolution temperature is 60°C, the dry spinning length is 2cm, the extrusion volume flow rate is 5ml / min, the spinning solution temperature is 20°C, and the gel bath temperature is 5°C; the gel bath is water.

[0028] The method specified in the documents "Development of Reinforced Polyvinylidene Fluoride Microporous Membrane", "Research on Hollow Fiber Polyvinylidene Fluoride Microporous Membrane", "Research on Dry-Spray Wet Spinning Polyacrylonitrile Fiber Drawing Technology" is used for detection. The water permeability of the membrane is 100L / m 2 h; the mechanical properties are as follows: breaking strength 10.23N, breaking elongation 26.4%.

Embodiment 2

[0030] Dissolve 10 grams of polyvinylidene fluoride with a molecular weight of 30,000 to 60,000 and 10 grams of polyvinylpyrrolidone in 80 grams of N-methyl-2-pyrrolidone solvent, and then adopt a dry-wet spinning process known in the art to obtain a porous structure fibrous membranes, such as figure 1 and figure 2 shown.

[0031] The dissolution temperature is 95°C, the dry spinning length is 15cm, the extrusion volume flow rate is 10ml / min, the spinning solution temperature is 90°C, and the gel bath temperature is 50°C; the gel bath is water.

[0032] The method specified in the documents "Development of Reinforced Polyvinylidene Fluoride Microporous Membrane", "Research on Hollow Fiber Polyvinylidene Fluoride Microporous Membrane", "Research on Dry-Spray Wet Spinning Polyacrylonitrile Fiber Drawing Technology" is used for detection. The water permeability of the membrane is 900L / m 2 ·h; mechanical properties are as follows: breaking strength, 8.38N; breaking elongation,...

Embodiment 3

[0034] Dissolving 20 grams of polyvinyl chloride with a molecular weight of 30000-60000 and 15 grams of additive polyethylene glycol in 65 grams of solvent, and then adopting a dry-wet spinning process known in the art to obtain a porous structure fiber membrane;

[0035] Said solvent is selected from 1-methyl-2 pyrrolidone;

[0036] The dissolution temperature is 75°C, the dry spinning length is 55cm, the extrusion volume flow rate is 12ml / min, the spinning solution temperature is 55°C, and the gel bath temperature is 27°C; the gel bath is water.

[0037] The method specified in the documents "Development of Reinforced Polyvinylidene Fluoride Microporous Membrane", "Research on Hollow Fiber Polyvinylidene Fluoride Microporous Membrane", "Research on Dry-Spray Wet Spinning Polyacrylonitrile Fiber Drawing Technology" is used for detection. The water permeability of the membrane is 200L / m 2 · h; mechanical properties are as follows: breaking strength 7.11N, breaking elongation ...

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Abstract

A fibrous membrane with porous cross-section structure features that the number of pores is 5,7 or 9, the pore wall shows five-layer bidirectional asymmetric structure consisting of external compact layer, finger pore supporting layer, sponge layer containing micropores, finger pore layer and internal compact layer, and its water permeability is 100-900 L/sq.m.h. Its preparing process is also disclosed.

Description

technical field [0001] The invention relates to a fiber membrane with a porous structure and a preparation method thereof, in particular to a high-strength fiber membrane suitable for sewage treatment and a preparation method thereof. Background technique [0002] Membrane separation technology has developed rapidly in the past 20 years, and its application has developed from early desalination to wastewater treatment in chemical, food, pharmaceutical, electronics and other industries, product separation and production of high-purity water, etc., and has become an important chemical operation unit. Compared with conventional separation methods, the membrane process has the advantages of high single-stage separation efficiency, simple process, and no environmental pollution. It is an important high-tech solution to contemporary energy, resource and environmental problems, and will play a role in the transformation of industrial technology in the 21st century. with far-reachin...

Claims

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Application Information

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IPC IPC(8): B01D69/08
Inventor 奚旦立高春梅陈季华
Owner DONGHUA UNIV
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