Polyether sulfone-polyurethane blend hollow fiber membrane and preparation method thereof

The technology of polyurethane and polyethersulfone is applied in the field of preparation of polyethersulfone-polyurethane blended hollow fiber membrane and its non-solvent induced phase separation method, which can solve the problems of poor strength of hollow fiber membrane, complicated process and high cost. Achieve the effect of increasing flexibility, reducing wire breakage and improving strength

Inactive Publication Date: 2011-04-20
HUIZHOU QIXIN MEMBRANE PURIFICATION & ENVIRONMENTPROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermally induced phase separation process needs to extract the hollow fiber formed by cooling, the process is more complicated than the non-solvent induced phase separation process, and the cost of the thermally induced phase separation process is much higher than that of the non-solvent induced phase separation process
[0006] The non-solvent-induced phase separation method is mature and simple, but it has a big disadvantage that the prepared hollow fiber membrane has poor strength.

Method used

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  • Polyether sulfone-polyurethane blend hollow fiber membrane and preparation method thereof
  • Polyether sulfone-polyurethane blend hollow fiber membrane and preparation method thereof
  • Polyether sulfone-polyurethane blend hollow fiber membrane and preparation method thereof

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preparation example Construction

[0057] In the present invention, a preparation method of polyethersulfone-polyurethane blended hollow fiber membrane is also provided, which is prepared by non-solvent-induced phase separation method, and the preparation steps are as follows:

[0058] Step (1): First, put polyethersulfone, polyurethane, polymer pore-forming agent, surfactant, water and solvent in a certain proportion into the reaction kettle, and stir at 50-90°C for more than 20 hours to fully and evenly dissolve;

[0059] Step (2): Then, stop stirring, filter, vacuumize and degas, and lower the temperature to obtain a casting solution at 30~70°C;

[0060] Step (3): Next, transport the casting solution to a seven-round tube spinneret at 30-60°C, and pour an internal coagulation solution at 20-60°C into the seven round tubes to form inner holes and extrude hollow fiber;

[0061] Step (4): Finally, pass the hollow fiber through an air distance of 50-300mm, enter the external coagulation liquid at 20-60°C for co...

Embodiment 1

[0065] Example 1: Weigh 15% of polyethersulfone, 2% of polyurethane, 15% of polyethylene glycol, 3% of polyvinylpyrrolidone, 1% of water, and 64% of dimethylacetamide by weight percentage and put them into the reaction kettle. Stir at 80°C for 20 hours, then stop stirring, filter, vacuumize and defoam, and cool down to obtain a 50°C casting liquid, which is transported to a seven-round tube spinneret at 50°C through a metering pump. Deionized water at 30°C is extruded into a hollow fiber with seven inner holes, then passes through an air distance of 200mm, enters an aqueous solution with 30% dimethylacetamide content at 30°C and solidifies, and then collects the filaments , to obtain a polyethersulfone-polyurethane mixed hollow fiber membrane. The prepared polyethersulfone-polyurethane blended hollow fiber membrane has an inner diameter of 0.92mm, an outer diameter of 4.26mm, and a pure water flux of 1800L / M 2 ·H (0.1MPa, 25°C), with an average pore diameter of 0.13μm, a tens...

Embodiment 2

[0068] Example 2: Weigh 13% of polyethersulfone, 3% of polyurethane, 15% of polyethylene glycol, 1% of water, and 68% of dimethylacetamide in the reaction kettle by weight percentage, and stir at 80°C for 20h , then stop stirring, filter, vacuumize and defoam, and lower the temperature to obtain a 50°C casting solution, which is transported to a seven-round tube spinneret at 50°C through a metering pump, and 20% bismuth at 30°C is passed into the seven round tubes The aqueous solution containing methyl acetamide is extruded into a hollow fiber with seven inner holes, and then passes through the air distance of 200mm, enters the aqueous solution water with 30% dimethyl acetamide content at 30 ℃ and solidifies, and then the membrane filament collected to obtain a polyethersulfone-polyurethane blended hollow fiber membrane. The prepared polyethersulfone-polyurethane blended hollow fiber membrane has an inner diameter of 0.96mm, an outer diameter of 4.30mm, and a pure water flux o...

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Abstract

The invention relates to a polyether sulfone-polyurethane blend hollow fiber membrane and a preparation method thereof. In the hollow fiber membrane, polyether sulfone is taken as a main membranous material; polyurethane is added for blending; and a high molecular pore forming agent, a surfactant, a solvent and the like are added to prepare casting solution; and the polyether sulfone-polyurethane blend hollow fiber membrane is prepared by a dry-wet method, namely, a nonsolvent induced phase separation method spinning process. The prepared polyether sulfone-polyurethane blend hollow fiber membrane has seven inner bores with the inner diameter of 0.8 to 1.0mm and the outer diameter of 3.8 to 4.5mm, has high hydrophilcity, the flux of pure water of 300 to 2,900 L/M<2>.H(0.1MPa and 25 DEG C), high intensity and the tensile breaking force of 30 to 62N, has the advantages of high flexibility, the breaking elongation of 60 to 110 percent, high chemical resistance, high pollution resistance, and the like, and is easy to clean.

Description

technical field [0001] The invention relates to a polyethersulfone-polyurethane blended hollow fiber membrane and a preparation method thereof by a non-solvent-induced phase separation method. Background technique [0002] Membrane separation technology has developed rapidly in recent years and is widely used in wastewater treatment in chemical, food, pharmaceutical, electronics, electric power and other industries, municipal tap water and sewage treatment, household and commercial drinking water filtration and treatment, etc. Compared with traditional separation methods, membrane separation methods have the advantages of low energy efficiency, no phase change, simple process, and no pollution to the environment. The materials used to make separation membranes have developed from cellulose acetate to polyethylene, polypropylene, polyvinyl chloride, polyacrylonitrile, polysulfone, polyvinylidene fluoride, polyethersulfone, etc.; from a single material to two Or a blend of tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/54B01D69/08B01D67/00
Inventor 刘冠文
Owner HUIZHOU QIXIN MEMBRANE PURIFICATION & ENVIRONMENTPROTECTION
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