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A high-humidity hollow fiber membrane filament pouring method

A fiber filter membrane and high-humidity technology, applied in the field of membrane separation, can solve the problems of low cost, broken filaments, large water flux, etc., and achieve improved filtration performance and mechanical properties, improved worry performance, and strong hydrophilicity Effect

Active Publication Date: 2020-06-12
HEBEI ZHONGQUAN ENVIRONMENT PROTECTION TECHCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, reinforced hollow fiber membranes have received attention. For example, the inner support hollow fiber membrane is formed by coating the casting solution on the outer surface of the braided tube and then solidified. The membrane has a single-layer structure and can be used as an external pressure membrane or Suction membranes are used, and most of the membranes used in sewage treatment are hollow fiber ultrafiltration membranes. Because of their thin membrane filaments, large filling area per unit volume, large water flux, and low cost, they are widely used. However, the hollow fiber ultrafiltration membrane needs to be cleaned continuously during use, which can easily lead to broken wires, and the appearance of broken wires will cause the entire filtration system to collapse

Method used

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  • A high-humidity hollow fiber membrane filament pouring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 25g of polytetrafluoroethylene and 75g of dimethylformamide, put it into a three-necked flask, stir and melt in a water bath at 40°C, stop stirring after melting, keep it warm for defoaming; mix 10g of dimethyl sulfoxide with 90g of water Obtain solidified core fluid evenly; mix 40g cellulose acetate and 60g methyl salicylate, heat to 40°C to obtain an atmosphere fluid; twist 50dtex polyester fiber to form a braided tube through twisting and machine braiding; spin in three channels The inner channel, the middle channel and the outer channel in the plate are respectively fed or poured with braided pipe, casting liquid and solidified core liquid, extruded, and the extruded film thread passes through a 15cm air gap, which is filled with atomized The temperature of the atomized air liquid is 20°C. After passing through the air gap, the membrane filament enters the solidified core fluid again, and then undergoes water washing, post-processing and winding to obtain a high-...

Embodiment 2

[0028] Mix 30g of polypropylene and 70g of dimethylacetamide, put it into a three-necked flask, stir and melt in a water bath at 50°C, stop stirring after melting, keep it warm for defoaming; mix 13g of N-methylpyrrolidone and 87g of water evenly to solidify Core fluid; mix 50g cellulose acetate with 50g methyl salicylate, heat to 50°C to obtain an atmosphere fluid; twist 100dtex polyamide fibers to form a braided tube; in a three-channel spinneret The inner channel, the middle channel and the outer channel are passed or poured into the braided pipe, the casting liquid and the solidified core liquid respectively, extruded, and the extruded film thread passes through the 20cm air gap, which is filled with the atomized atmosphere liquid , the temperature of the atomized air liquid is 30°C. After passing through the air gap, the membrane filament enters the solidified core fluid again, and then undergoes water washing, post-processing and winding to obtain a high-humidity hollow f...

Embodiment 3

[0030] Mix 35g of polyimide, 35g of dimethylformamide and 30g of dimethylacetamide, put them into a three-necked flask, stir and melt in a water bath at 60°C, stop stirring after melting, keep it warm for defoaming; put 16g of dimethylformamide Mix base sulfoxide and 84g water evenly to obtain a coagulated core liquid; mix 55g cellulose acetate and 45g methyl salicylate, and heat to 60°C to obtain an atmosphere liquid; 150dtex glass fibers are twisted and machine-braided to form a braided tube ; In the inner channel, the middle channel and the outer channel of the three-pass spinneret, respectively pass into or pour the braided pipe, the cast film liquid and the solidified core liquid, extrude, and the extruded film silk passes through the air gap of 25cm, and the The air gap is filled with atomized air liquid, and the temperature of the atomized air liquid is 40°C. After passing through the air gap, the membrane filament enters the solidified core fluid again, and then undergo...

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Abstract

The invention discloses a pouring method of high-humidity hollow fiber filter membrane filaments. The method comprises steps as follows: a membrane casting solution is prepared from a high-polymer membrane preparation material and a diluent, a solidification core liquid is prepared from a solvent and water, a solidification atmosphere liquid is prepared from cellulose acetate and a cosolvent, thefilter membrane filaments are ejected by a three-channel spinneret plate, the surfaces of the filter membrane filaments are treated by an atomizing atmosphere liquid, and finally, the high-humidity hollow fiber filter membrane filaments are formed. The filter membrane filaments prepared with the pouring method have good surface performance and mechanical properties, and hydrophility and filter capacity can be improved.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a casting method for high-humidity hollow fiber membrane filaments. Background technique [0002] Hollow fiber membrane filaments have many advantages such as high packing density, no need for supporting materials, and simple production process. They are widely used in the field of separation technology. In the preparation of hollow fiber membranes, phase inversion wet spinning, dry spinning, dry-wet spinning and melt spinning-stretching, melt spinning-sintering, melt spinning-dissolution and other methods. The hollow fiber membranes obtained by these preparation methods have been able to meet the requirements for membrane strength in the fields of general chemical separation, enrichment, and purification. However, for some occasions where the separation strength is high, the strength of the hollow fiber membrane is not satisfactory. [0003] In recent years, reinfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D67/00
CPCB01D67/0016B01D69/08
Inventor 陈泉学
Owner HEBEI ZHONGQUAN ENVIRONMENT PROTECTION TECHCO LTD
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