Preparation method of double-layer hollow fibrous nanofiltration membrane
A double-layer hollow nanofiltration membrane technology, which is applied in the field of membrane separation, can solve the problems of low yield of nanofiltration membranes, complicated preparation methods, and many factors affecting the process, so as to achieve uniform and stable membrane layers, good separation performance, The effect of simplifying the preparation process
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[0015] Example 1:
[0016] (1) Mix the high molecular polymer a, organic solvent and dispersant in a mass ratio of 10%: 45%: 45% to form a uniform and stable casting liquid A, and remove the bubbles in the casting liquid by vacuum suction ,stand-by.
[0017] (2) Mix the high molecular polymer b, organic solvent, and dispersant according to the mass ratio of 20%:50%:30% to form a uniform and stable casting solution B, and remove the bubbles in the casting solution by vacuum suction ,stand-by.
[0018] (3) The casting liquid A and the casting liquid B are simultaneously sprayed through the dual-hole spinneret under pressure driving. The driving pressure of the casting liquid A is 0.05 MPa, and the driving pressure of the casting liquid B is 0.2 MPa. The liquid flow rate is 20ml / min, the distance of the air section is 10cm, and the spun membrane yarn enters the outer gel bath water to form a double-layer hollow fiber nanofiltration membrane.
Example Embodiment
[0019] Example 2:
[0020] (1) Mix the high molecular polymer a, organic solvent and dispersant in a mass ratio of 10%: 45%: 45% to form a uniform and stable casting liquid A, and remove the bubbles in the casting liquid by vacuum suction ,stand-by.
[0021] (2) Mix the high molecular polymer b, organic solvent and dispersant in a mass ratio of 25%:50%:25% to form a uniform and stable casting solution B, and remove the bubbles in the casting solution by vacuum suction ,stand-by.
[0022] (3) The casting liquid A and the casting liquid B are simultaneously sprayed through the dual-hole spinneret under pressure driving. The driving pressure of the casting liquid A is 0.05 MPa, and the driving pressure of the casting liquid B is 0.2 MPa. The liquid flow rate is 20ml / min, the distance of the air section is 10cm, and the spun membrane yarn enters the outer gel bath water to form a double-layer hollow fiber nanofiltration membrane.
Example Embodiment
[0023] Example 3:
[0024] (1) Mix the high molecular polymer a, organic solvent and dispersant in a mass ratio of 10%: 45%: 45% to form a uniform and stable casting liquid A, and remove the bubbles in the casting liquid by vacuum suction ,stand-by.
[0025] (2) Mix the high molecular polymer b, organic solvent, and dispersant in a mass ratio of 30%:50%:20% to form a uniform and stable casting solution B, and remove the bubbles in the casting solution by vacuum suction ,stand-by.
[0026] (3) The casting liquid A and the casting liquid B are simultaneously sprayed through the dual-hole spinneret under pressure driving. The driving pressure of the casting liquid A is 0.05 MPa, and the driving pressure of the casting liquid B is 0.2 MPa. The liquid flow rate is 20ml / min, the distance of the air section is 10cm, and the spun membrane yarn enters the outer gel bath water to form a double-layer hollow fiber nanofiltration membrane.
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