Preparation method for strength-reinforced anti-microbial hollow fiber separating membrane

A fiber separation and fiber membrane technology, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc.

Inactive Publication Date: 2015-03-25

华文蔚

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AI-Extracted Technical Summary

Problems solved by technology

However, there are few reports on the preparation of functional polymer fi...

Abstract

The invention discloses a preparation method for a strength-reinforced anti-microbial hollow fiber separating membrane. The preparation method comprises the following steps: (1) preparing a casting liquid, namely mixing polyether sulfone, thermoplastic polyurethane, polyethylene glycol, sodium dodecyl sulfate, lithium chloride and an organic solvent in ratio by weight of (10-30) : (1-6) : (2-12) : (1-2) : (1-20) : (60-90) to a reaction kettle, heating, thermally stirring and dissolving for 10-12 hours; after the raw materials are dissolved, standing till the temperature is up to the room temperature, and adding a certain quantity of quaternary ammonium salt-acrylonitrile copolymer; starting stirring, mixing uniformly, and filtering, defoaming and purifying the obtained liquid; (2) manufacturing a hollow fiber membrane, namely extruding the prepared membrane manufacturing liquid to a spinning nozzle by utilizing a metering pump, and extruding a core liquid quantitatively to an inner needle of the spinning nozzle through the metering pump; spinning by the spinning nozzle, feeding the spun fibers to sequentially pass through a coagulating bath to be cooled and coagulated and a stretching groove to be subjected to post-treatment under the action of a fraction wheel, so as to obtain the hollow fiber membrane.

Application Domain

Semi-permeable membranes

Technology Topic

Dodecylsulfonic acidThermoplastic polyurethane +15

Examples

Experimental program(3)

Example Embodiment

[0022] Example 1

[0023] (1) Preparation of casting solution

[0024] Combine polyethersulfone, thermoplastic polyurethane, polyethylene glycol, sodium dodecyl sulfonate, lithium chloride, and dimethyl sulfoxide in a weight ratio of 10:1:2:1:1:60 in the reaction Mix in the kettle, then heat and stir to dissolve, the time is 12 hours; after the above raw materials are dissolved, let stand until the temperature reaches room temperature, add a certain amount of quaternary ammonium salt-acrylonitrile copolymer; start stirring, mix, and then combine the obtained The solution is filtered, defoamed and purified;

[0025] (2) Production of hollow fiber membranes

[0026] The film-forming liquid prepared in step (1) is squeezed into the spinneret through the metering pump, and the core liquid is quantitatively squeezed into the inner needle of the spinneret through the metering pump; Under the action of, the spinning passes through the coagulation bath to cool and coagulate and the post-treatment of the stretching tank to obtain the hollow fiber membrane.

[0027] The breaking strength of the hollow fiber membrane is 3.0 MPa, the pure water flux at 25° C. and 0.1 MPa is 2500 L/m2.h, the porosity is 90%, and the average pore diameter of the membrane is 1 nm.

Example Embodiment

[0028] Example 2

[0029] (1) Preparation of casting solution

[0030] Combine polyethersulfone, thermoplastic polyurethane, polyethylene glycol, sodium dodecyl sulfonate, lithium chloride, and dimethylformamide in a weight ratio of 30:-6:2:2:20:90. Mix in the reaction kettle, then heat and stir to dissolve for 12 hours; after the above-mentioned materials are dissolved, let stand until the temperature reaches room temperature, add a certain amount of quaternary ammonium salt-acrylonitrile copolymer; start stirring, mix, and then The resulting solution is filtered, defoamed and purified;

[0031] (2) Production of hollow fiber membranes

[0032] The film-forming liquid prepared in step (1) is squeezed into the spinneret through the metering pump, and the core liquid is quantitatively squeezed into the inner needle of the spinneret through the metering pump; Under the action of, the spinning passes through the coagulation bath to cool and coagulate and the post-treatment of the stretching tank to obtain the hollow fiber membrane.

[0033] The breaking strength of the hollow fiber membrane is 2.5 MPa, the pure water flux at 25° C. and 0.1 MPa is 2000 L/m2.h, the porosity is 85%, and the average pore diameter of the membrane is 0.5 nm.

Example Embodiment

[0034] Example 3

[0035] (1) Preparation of casting solution

[0036] Polyethersulfone, thermoplastic polyurethane, polyethylene glycol, sodium dodecyl sulfonate, lithium chloride, dimethylacetamide, according to the weight ratio, 20:4:2:1:10:90 in the reaction Mix in the kettle, then heat and stir to dissolve for 11 hours; after the above-mentioned materials are dissolved, let stand until the temperature reaches room temperature, add a certain amount of quaternary ammonium salt-acrylonitrile copolymer; start stirring, mix, and then combine The solution is filtered, defoamed and purified;

[0037] (2) Production of hollow fiber membranes

[0038] The film-forming liquid prepared in step (1) is squeezed into the spinneret through the metering pump, and the core liquid is quantitatively squeezed into the inner needle of the spinneret through the metering pump; Under the action of, the spinning passes through the coagulation bath to cool and coagulate and the post-treatment of the stretching tank to obtain the hollow fiber membrane.

[0039] The breaking strength of the hollow fiber membrane is 2.8 MPa, the pure water flux at 25° C. and 0.1 MPa is 1900 L/m2.h, the porosity is 85-90%, and the average pore diameter of the membrane is 0.1 μm.

PUM

Property	Measurement	Unit
Breaking strength	2.5 ~ 3.0	MPa
Pure water flux	1500.0 ~ 2500.0	h·l/m²
Average pore size	0.1	µm

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