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Method and spinning device for producing porous hollow yarn membrane

A manufacturing method and technology of porous membranes, applied in hollow filament manufacturing, fiber processing, rayon manufacturing, etc., can solve problems such as cracking and difficulties of porous hollow fiber membranes, and achieve the effect of suppressing cracking

Active Publication Date: 2015-01-14
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in conventional spinning nozzles such as spinning nozzle 101, especially when the spinning speed is increased to produce porous hollow fiber membranes at low cost and high productivity, the porous membrane layer formed on the outside of the reinforcement support The starting point of cracking in the axial direction is formed on the upper surface, and cracking may occur when the obtained porous hollow fiber membrane is deformed into a flat shape, etc.
In addition, as in Patent Documents 1 and 2, even in devices using porous hollow fiber membranes such as filters and static mixers, it is difficult to sufficiently suppress the initiation of cracks in the axial direction from being formed on the porous membrane layer.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Method and spinning device for producing porous hollow yarn membrane
  • Method and spinning device for producing porous hollow yarn membrane
  • Method and spinning device for producing porous hollow yarn membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0242] (Manufacture of reinforced support body)

[0243] use Figure 10 The support body manufacturing apparatus 70 shown manufactures a reinforcement support body.

[0244] The supporting body manufacturing device 70 is provided with: a bobbin 72; a circular knitting machine 76 for knitting the wire 74 pulled out from the bobbin 72 into a circle; A rope supply device 80 for pulling; a heating mold 82 for heat-treating the hollow braided rope 78; a pulling device 84 for pulling the heat-treated hollow braided rope 78; A winder 86 wound on a bobbin.

[0245] Polyester fiber (denier: 84 dtex, number of single fibers: 36, false twisted yarn) was used as the yarn. As the bobbin 72, five rolls on which 5 kg of the polyester fiber was wound were prepared. As the circular knitting machine 76 , a desktop rope knitting machine (manufactured by Yuanjing Textile Machinery Co., Ltd., number of knitting needles: 12, needle size: 16 gauge, peripheral diameter of the main shaft: 8 mm) wa...

Embodiment 2、10～12

[0254] As shown in Table 2 and Table 3, the travel speed of the reinforcement support, the discharge amount of the first film-forming stock solution and the second film-forming stock solution from the spinning nozzle 10, and the time t 1 , time t 2 , than (t 1 / T 1 ) and ratio (t 2 / T 2 ) was changed, the rest was the same as in Example 1 to produce a porous hollow fiber membrane.

Embodiment 3、4、13

[0256]Except that the first upstream side branch confluence part 50 and the second upstream side branch confluence part 52 were respectively changed into three-stage fixed plate tube agitators (manufactured by Mercury Supply Systems Corporation, type: 005-031) arranged in series, and as shown in the table 2 and Table 3, the traveling speed of the reinforcement support, the discharge amount of the first film-forming stock solution and the second film-forming stock solution from the spinning nozzle 10, and the time t 1 , time t 2 , than (t 1 / T 1 ) and ratio (t 2 / T 2 ) was changed, the rest was the same as in Example 1 to produce a porous hollow fiber membrane.

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Abstract

The purpose of the present invention is to control cracking of a porous hollow yarn membrane, even one produced under a high spinning speed. The method for producing a porous hollow yarn membrane of the present invention comprises a spinning and coagulation step wherein the membrane-producing liquor branches into multiple currents that merge back together; the membrane-producing liquid that has formed multiple merging sites is fed to a spinning nozzle (10); inside the spinning nozzle (10) the membrane-producing liquor branches, merges annularly, and then is extruded annularly; and the membrane-producing liquor is coagulated with a coagulating bath. The ratio (t / T) of the time t found by the formula t = V / Q (where V is the volume (cm3) of the liquor flow path, from the point where the first merging site is formed in the membrane-forming liquor to the point where the membrane-forming liquor that has branched merges inside the spinning nozzle, and Q is the amount extruded per time (cm3 / second) of membrane-forming liquor from the spinning nozzle (10)) and the viscoelastic relaxation time T of the membrane-forming liquor is less than 1. Moreover, spinning device (1) is used for the production method.

Description

technical field [0001] The present invention relates to a method for manufacturing a porous hollow fiber membrane. [0002] this application claims priority based on Japanese Patent Application No. 2012-060208 for which it applied to Japan on March 16, 2012, and uses the content here. Background technique [0003] Water treatment using a filtration membrane excellent in separability and compactness has attracted attention due to rising concerns about environmental pollution and strengthening of regulations. As a filtration membrane in water treatment, a porous hollow fiber membrane having a hollow porous membrane layer is suitably used (for example, Patent Document 1). In the production of porous hollow fiber membranes, for example, a membrane-forming stock solution is spun by a spinning device, and the membrane-forming stock solution is coagulated with a coagulation solution to form a porous hollow fiber membrane precursor. Then, the solvent and pore opening agent remaini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08D01D5/24
CPCD01D5/24B01D69/085B01D69/087B01D69/0871B01D69/081B01D67/0016B01D69/1213B01D69/10B01D71/34B01D2323/42B01D2325/04B01D2323/18B01D2325/38B01D2323/2187
Inventor 藤木浩之隅敏则广本泰夫皆川正和
Owner MITSUBISHI CHEM CORP