Preparation method of hollow fiber nanofiltration membrane

A fiber membrane and nanofiltration membrane technology, applied in the field of separation membrane manufacturing, can solve the problems of performance deterioration, reinforced mesh or reinforced fiber being easily peeled off from the membrane body, low strength of homogeneous hollow fiber membrane, etc. Simple and advanced production process, high-strength effect

Inactive Publication Date: 2017-12-12
上海健水源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of the homogeneous hollow fiber membrane is slightly low, and it is easy to deform under the operating pressure of nanofiltration; at present, there are hollow fiber membranes reinforced with braided mesh and fibers, but the reinforced mesh or the reinforced fiber is prone to contact with the membrane body during use. The phenomenon of peeling off will cause structural damage and performance deterioration of the hollow fiber membrane

Method used

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  • Preparation method of hollow fiber nanofiltration membrane
  • Preparation method of hollow fiber nanofiltration membrane
  • Preparation method of hollow fiber nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 2 beaded fibers reinforced polyethersulfone hollow fiber nanofiltration membrane:

[0037] 1. Prepare polyethersulfone casting solution and let stand for defoaming;

[0038] 2. Prepare silica, additives, polyamide, etc. and solvents to make an electrospinning solution;

[0039] 3. Set the electrospinning conditions, including: the static voltage is 1kV, the spinning speed is 5m / s, etc., turn on the electrospinning equipment, and use air spinning technology to spin beaded fibers; the discharge needles of the electrospinning device are 2 ;

[0040] 4. Turn on the hollow fiber spinning machine, and at a certain temperature and pressure, the casting liquid passes through the spinneret and the electrospinning needle tip, and enters the coagulation bath at the same time as the polymer solution ejected from the electrospinning to form a film. . The electrospun beaded fibers were embedded in the fibers to obtain a hollow fiber nanofiltration membrane reinforced with 2 beaded...

Embodiment 2

[0042] 100 beaded fibers reinforced polyethersulfone hollow fiber nanofiltration membrane:

[0043] 5. Prepare polysulfone and polyethersulfone blended casting solution, and let stand for defoaming;

[0044] 6. Prepare graphene, additives, polyvinylidene fluoride, etc., and solvents into an electrospinning solution;

[0045] 7. Set the electrospinning conditions, including: the static voltage is 50kV, the spinning speed is 50m / s, etc., the electrospinning equipment is turned on, and the air spinning technology is used to spin beaded fibers; the discharge needles of the electrospinning device are 100 ;

[0046] 8. Turn on the hollow fiber spinning machine, and at a certain temperature and pressure, the casting liquid passes through the spinneret and the electrospinning needle tip, and enters the coagulation bath at the same time as the polymer solution ejected from the electrospinning to form a film. . The electrospun beaded fibers were embedded in the fibers to obtain a hol...

Embodiment 3

[0048] 6 fiber bundles reinforced polyethersulfone hollow fiber nanofiltration membrane:

[0049] 9. Prepare polysulfone and polyethersulfone blend casting solution, and let it stand for defoaming;

[0050] 10. Prepare titanium dioxide, additives, polyamide, etc. and solvents into an electrospinning solution;

[0051] 11. Set the electrospinning conditions, including: the static voltage is 20kV, the spinning speed is 100m / s, etc., the electrospinning equipment is turned on, and the quantitative control technology is used to spin fiber bundles to strengthen the hollow fiber nanofiltration membrane; the electrospinning device There are 6 discharge needles;

[0052]12. Turn on the hollow fiber spinning machine, and at a certain temperature and pressure, make the casting liquid pass through the spinneret and the electrospinning needle tip, and enter the coagulation bath at the same time as the polymer solution ejected from the electrospinning to form a film . The electrospun be...

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Abstract

The invention relates to a preparation method of an anti-pollution and high-strength hollow fiber nanofiltration membrane. The technical solution of the present invention is to design a new spinning process (see Figure 1 and Figure 2), which uses polyethersulfone (PES), sulfonated polyethersulfone (SPES) or a blend of the two As the body material, the electrospinning technology is combined with the traditional non-solvent phase inversion spinning process. When the hollow fiber casting solution is extruded from the spinneret, the solution ejected from the electrospinning needle just enters the hollow fiber membrane wall. The two fall into the coagulation bath together to undergo phase inversion, and after rinsing, winding and other processes, a hollow fiber nanofiltration membrane with functionalized beaded fibers or superfine fiber bundles as reinforcements is obtained. Multiple beaded fibers or superfine fiber bundles form reinforcing ribs firmly embedded in the hollow fiber nanofiltration membrane (see Figure 3, Figure 4), which is difficult to peel off. The reinforcing rib is a high-strength resin mixed with inorganic particles, which endows the hollow fiber nanofiltration membrane with Higher strength and stain resistance. The process of the invention is simple and advanced, and is suitable for large-scale production of hollow fiber membrane plants.

Description

technical field [0001] The invention relates to a method for preparing a nanofiltration membrane, in particular to a method for preparing a hollow fiber nanofiltration membrane with beaded fibers or superfine fiber bundles as reinforcements, and belongs to the field of separation membrane manufacturing. Background technique [0002] Nanofiltration membrane (Nanofiltration, NF) is a new type of separation membrane with a cut-off performance between ultrafiltration and reverse osmosis. The rejection rate of the nanofiltration membrane for monovalent salts is less than 50%, and the rejection rate for divalent and multivalent salts is above 80%. It can also intercept dissolved components with a relative molecular mass of more than 200. In addition, the transmembrane pressure difference required by the nanofiltration process is generally 0.5-2.0 MPa, which is 0.5-3.0 MPa lower than the pressure difference required to achieve the same permeation flux by reverse osmosis. Due to it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/08B01D67/00B01D61/02
CPCB01D71/68B01D61/027B01D67/0002B01D69/08
Inventor 不公告发明人
Owner 上海健水源新材料科技有限公司
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