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Improved spinneret plate for parallel channel nanofiltration membrane and preparation method thereof

A parallel channel, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of large quantity and low incidence of wire breakage

Active Publication Date: 2019-04-19
TIANJIN MOTIMO MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the preparation process of the base membrane of the hollow fiber nanofiltration membrane, due to the expansion of the polymer and the combined effects of various factors such as radial stretching and transverse shrinkage, the final parallel channel basement membrane deviates seriously from the spinneret hole. The hollow fiber nanofiltration membrane prepared by the base membrane is prone to breakage and deformation during the spinning process, destroying the dense desalination layer on the surface and reducing the membrane performance

Method used

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  • Improved spinneret plate for parallel channel nanofiltration membrane and preparation method thereof
  • Improved spinneret plate for parallel channel nanofiltration membrane and preparation method thereof
  • Improved spinneret plate for parallel channel nanofiltration membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: The axial distance of the straight transition holes of adjacent spinneret units is 0.1mm; the radius of the spinneret holes is 0.25mm, and the radius of the arc-shaped spinneret holes in the middle is 0.45mm; The radius of the wire hole is 0.55 mm. The base film was spun by using the improved spinneret of Example 1, the feeding pressure of the feed liquid was 0.03 MPa, the drawing speed was 16.5 m / min, the solid content of the feed liquid was 15%, and the temperature of the coagulation bath was 55° C.; a multi-channel base film was obtained.

Embodiment 2

[0019] Embodiment 2: the axial distance of the straight transition hole of the adjacent spinneret unit is 0.2mm; the radius of the spinneret hole is 0.3mm, and the radius of the arc-shaped spinneret hole in the middle is 0.5mm; The radius of the wire hole is 0.6 mm. The base film was spun with the improved spinneret of Example 2, the feeding pressure of the feed liquid was 0.1 MPa, the drafting speed was 24 m / min, the solid content of the feed liquid was 35%, and the temperature of the coagulation bath was 85° C.; a multi-channel base film was obtained.

Embodiment 3

[0020] Embodiment 3: the axial distance of the straight transition hole of the adjacent spinneret unit is 0.15mm; the radius of the spinneret hole is 0.28mm, and the radius of the arc-shaped spinneret hole in the middle is 0.48mm; The radius of the wire hole is 0.58mm. The base film was spun with the improved spinneret of Example 3, the feed liquid delivery pressure was 0.05 MPa, the drafting speed was 21.5 m / min, the feed liquid solid content was 16%, and the coagulation bath temperature was 75°C. After the multi-channel basement membrane is obtained, it is immersed in deionized water to be tested.

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Abstract

The invention belongs to the field of hollow fiber membrane preparation, and specifically relates to an improved spinneret plate for parallel channel nanofiltration membrane and a preparation method thereof. The spinneret plate includes multiple spinneret units in mutual connection; the spinneret units include spinneret holes, and arc-shaped spinneret holes symmetrically arranged on the upper andlower sides of the spinneret holes; and the adjacent arc-shaped spinneret holes are connected to each other through straight transition holes. Thus, the serious deviation problem of parallel channel basement membranes and the spinneret holes under the combined action of various factors of radial stretching and lateral contraction due to polymer expansion during the preparation of the basement membranes can be improved. The nanofiltration membranes prepared through the formed parallel channel basement membranes are high in intensity, large in flux and extremely low in filament break incidence rate.

Description

technical field [0001] The invention belongs to the field of hollow fiber membrane making, and in particular relates to a spinneret for an improved parallel channel nanofiltration membrane and a preparation method thereof. Background technique [0002] In the preparation process of the base membrane of the hollow fiber nanofiltration membrane, due to the expansion of the polymer and the combined effects of various factors such as radial stretching and transverse shrinkage, the final parallel channel basement membrane and the spinneret hole deviate seriously. The hollow fiber nanofiltration membrane prepared by the base membrane is prone to breakage, and is easily deformed during the spinning process, which destroys the dense desalination layer on the surface and reduces the membrane performance. Contents of the invention [0003] The purpose of the present invention is to overcome the defects in the prior art, and provide an improved spinneret for parallel channel nanofilt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D63/02
CPCB01D61/027B01D63/021
Inventor 王春浩胡晓宇梁恩宾
Owner TIANJIN MOTIMO MEMBRANE TECH