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Porous hollow fiber membrane

A hollow fiber membrane and hollow technology, applied in the field of porous hollow fiber membrane, can solve the problems of difficult membrane production process, high production cost, and many factors of membrane production conditions, and achieve excellent chemical durability, excellent physical durability, and high-purity water permeability. over performance effect

Active Publication Date: 2017-08-29
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the wet solution method has the following problems: it is difficult to cause phase separation uniformly in the film thickness direction, and a film with an asymmetric three-dimensional network structure including macropores is formed, so the strength is insufficient.
In addition, there are disadvantages that there are many film-forming condition factors that affect the film structure and film performance, so it is difficult to control the film-forming process and lacks reproducibility.
However, the strength is insufficient, and if the dispersibility of the inorganic fine particles is poor, there is a possibility of defects such as pinholes
In addition, the melt extraction method also has the disadvantage that the manufacturing cost is very high

Method used

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Experimental program
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preparation example Construction

[0140] (2-1) Preparation of membrane stock solution

[0141] The method for producing a porous hollow fiber membrane in the present invention further includes a step of preparing a fluororesin-based polymer solution. By dissolving the fluororesin polymer in a poor solvent or a good solvent of the fluororesin polymer at a relatively high temperature above the crystallization temperature, a fluororesin polymer solution (that is, a film-forming film containing the fluororesin polymer) is prepared. stock solution).

[0142] When the polymer concentration in the membrane-forming stock solution is high, a porous hollow fiber membrane having high strength can be obtained. On the other hand, when the polymer concentration is low, the porosity of the porous hollow fiber membrane increases, and the pure water permeability improves. Therefore, the concentration of the fluororesin polymer is preferably not less than 20% by weight and not more than 60% by weight, more preferably not less...

Embodiment 1

[0222] 36% by weight of a homopolymer of vinylidene fluoride (KF1300 manufactured by KLEHA Co., Ltd., weight average molecular weight: 417,000, number average molecular weight: 221,000) and 64% by weight of γ-butyrolactone were dissolved at 150°C. The Tc of this vinylidene fluoride homopolymer solution was 48°C. This solution was pressurized to 2.0 MPa by installing two gear pumps, and the line between them was pressurized to 2.0 MPa, and it was retained at 99 to 101° C. for 20 seconds, and then it was discharged from the outer tube of the double-tube spinneret. Simultaneously, an 85% by weight aqueous solution of γ-butyrolactone is discharged from the inner tube of the double-layer tube spinneret, and is retained for 20 seconds in a cooling bath at a temperature of 25° C. formed by an 85% by weight aqueous solution of γ-butyrolactone. , to make it harden. The obtained porous hollow fiber membrane had a columnar structure with a thickness uniformity of 0.62, a columnar struct...

Embodiment 2

[0225] 36% by weight of a homopolymer of vinylidene fluoride (KF1300 manufactured by KLEHA Co., Ltd., weight average molecular weight: 417,000, number average molecular weight: 221,000) and 64% by weight of γ-butyrolactone were dissolved at 150°C. The Tc of this vinylidene fluoride homopolymer solution was 48°C. The solution was pressurized to 2.0 MPa by installing two gear pumps, the line between them was pressurized to 2.0 MPa, and the solution was retained at 99 to 101° C. for 20 seconds, and then discharged from the outer tube of the double-tube spinneret. , Simultaneously, the 85% by weight aqueous solution of γ-butyrolactone is discharged from the pipe of the inner side of the double-tube spinneret, and stays in the 1st cooling bath of the temperature 5 ℃ that is formed by the 85% by weight aqueous solution of γ-butyrolactone After 10 seconds, the mixture was solidified by staying in a second cooling bath at a temperature of 25° C. consisting of an 85% by weight aqueous ...

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Abstract

The purpose of the present invention is to provide a porous hollow fiber membrane that has high strength while maintaining high purified water permeability. This porous hollow fiber membrane is formed from a fluororesin polymer, wherein there is a columnar structure oriented in the longitudinal direction of the porous hollow fiber membrane, and the molecular chain of the fluororesin polymer is oriented in the longitudinal direction of the porous hollow fiber membrane.

Description

technical field [0001] The present invention relates to a porous hollow fiber membrane suitable for various water treatments such as drinking water production, industrial water production, water purification treatment, drainage treatment, seawater desalination, and industrial water production. Background technique [0002] In recent years, porous membranes have been used in various fields such as water treatment fields such as water purification and wastewater treatment, medical applications such as blood purification, food industry fields, battery separators, charged membranes, and fuel cell electrolyte membranes. [0003] Especially in the field of drinking water production and industrial water production, that is, in the field of water treatment such as water purification treatment, drainage treatment and seawater desalination, as a substitute for the previous sand filtration, coagulation sedimentation, evaporation, etc., or in order to improve To treat water quality, por...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/32B01D69/02B01D69/08B01D71/34
CPCB01D69/02B01D69/08B01D71/32B01D67/0018B01D67/0027B01D2323/08B01D2325/02B01D2325/24B01D2325/30B01D2325/32B01D2325/34B01D67/0013B01D69/087B01D2323/10B01D71/34B01D2325/0281B01D67/00113B01D67/00165
Inventor 花川正行岩井健太石崎利之北出有木村将弘
Owner TORAY IND INC
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