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Method and apparatus for primary shaping composite or modified hollow fibre membrane

A fiber membrane, hollow technology, applied in fiber processing, filament/line forming, chemical instruments and methods, etc., can solve the problem of reduced production efficiency, poor production stability, composite or modified hollow fiber membrane production process can not be carried out continuously and other problems to achieve the effect of improving production efficiency and production stability

Inactive Publication Date: 2004-12-08
TIANJIN MOTIAN MEMBRANE ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the method for preparing composite or modified hollow fiber membranes in the prior art includes two processes that are not connected to each other, and has to be molded twice, so that the production process for preparing composite or modified hollow fiber membranes cannot be carried out continuously, reducing Increased production efficiency, and poor production stability

Method used

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  • Method and apparatus for primary shaping composite or modified hollow fibre membrane
  • Method and apparatus for primary shaping composite or modified hollow fibre membrane
  • Method and apparatus for primary shaping composite or modified hollow fibre membrane

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preparation example Construction

[0039] The spinning core liquid is known in the prior art for preparing hollow fiber membranes, and may be dialdehyde aqueous solution or water.

[0040] The liquid in the coagulation bath is a commonly used liquid for coagulating the spinning membrane, which may be water.

[0041] When the method of the present invention is used for one-time composite hollow fiber membrane spinning, the solution in the coating bath is a composite solution or a modified solution, and their types are determined according to the needs of composite membrane making, and the composite solution can be Solutions of polyvinyl alcohol (PVA), polyacrylic acid (PA), cellulose acetate (CA) or hydroxymethyl cellulose (CMC); the modified solution is dialdehyde, diacid, triacid or diisocyanate; Preference is given to using aqueous solutions of the modifying substances. The purpose of adding substances such as dialdehyde, diacid, triacid or diisocyanate is to make polyvinyl alcohol (PVA), polyacrylic acid (P...

Embodiment 1

[0051] Embodiment 1: as image 3 As shown, the spinning stock solution is PVDF solution (Solef PVDF 1015 22% by weight, polyethylene glycol 6000 10% by weight, dimethylacetamide 68% by weight), spinning core solution (glutaraldehyde 6% by weight aqueous solution), Coating bath (2% by weight PVA aqueous solution+2% by weight hydrochloric acid), is water in the coagulation bath, the time that passes in the coating bath is 20 seconds, the time that passes through microwave oven is 25 seconds, and temperature is 75 ℃. The method can prepare a PVA composite hollow fiber membrane. The surface of the prepared composite hollow fiber membrane is smooth and has good hydrophilicity. Since polyvinyl alcohol (PVA) macromolecules are not easy to pass through the membrane, the prepared composite hollow fiber membrane is a single-layer composite membrane with membrane The characteristics of small resistance and high separation efficiency. The resulting hollow fiber membrane has a molecular ...

Embodiment 2

[0054] Embodiment 2: as Figure 4 Shown, spinning dope is polysulfone solution (Udel PS-1700 25% by weight, polyvinylpyrrolidone K-30 10% by weight, dimethylacetamide 68% by weight), spinning core solution (glutaraldehyde 6% by weight Aqueous solution), coating bath (2% weight hydroxymethyl cellulose aqueous solution+2% weight hydrochloric acid, add surfactant soil temperature-20 1 weight %), be water in the coagulation bath, pass through glutaraldehyde 6% weight aqueous solution tank Afterwards, the time for entering into the 2% by weight hydroxymethylcellulose aqueous solution+2% by weight of hydrochloric acid coating bath is 20 seconds, the time for passing through the microwave heating box is 25 seconds, and the temperature is 75°C. The method can prepare a hydrophilic composite hollow fiber membrane. The prepared composite hollow fiber membrane has a smooth surface and good hydrophilicity. The resulting hollow fiber membrane has a molecular weight cut-off of 2000 Dalton...

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Abstract

A process for preparing the composite or modifier hollow fibre membrane includes such steps as spinning, preparing membrane, solidifying, coating compound or modifying substance, and heating for further reaction. Its apparatus is composed of solidifying bathtub, the bathtub containing compound or modifying solution, and heating box.

Description

Technical field: [0001] The invention relates to a method for forming composite or modified hollow fiber membranes at one time, and a device for forming composite or modified hollow fiber membranes at one time. The method is suitable for wet or dry-wet hollow fiber membrane spinning and melt spinning. Background technique: [0002] figure 1 It shows the hollow fiber membrane spinning method in the prior art. The feed liquid is injected into the spinning nozzle from the spinning stock solution tank and the spinning core liquid tank at the same time, and the membrane is spun through the spinning nozzle to form a membrane. The hollow fiber membrane 3 is obtained through solidification treatment in the coagulation bath 1, and the hollow fiber membrane is conducted to the wire winding machine 4 in the wire winding tank 2, and wound into rolls. [0003] After the hollow fiber membrane is spun, the hollow fiber membrane bundle or hollow fiber membrane module is immersed in a solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/04D01D5/38
Inventor 吕晓龙
Owner TIANJIN MOTIAN MEMBRANE ENG & TECH
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