Hollow fiber membrane and preparation method thereof

A fiber membrane and hollow technology, which is applied in the field of hollow fiber membrane and its preparation, can solve the problems of complex equipment, cumbersome process and high production cost, and achieve the effects of simple preparation method, simplified membrane production process and reduced membrane production cost.

Active Publication Date: 2014-07-16
无锡迈姆润环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned methods for preparing hollow fiber membranes are usually complicated in equipment, large in investment, cumbersome in process and long in process. For example, a screw extruder is required to melt the polymer or complex spinneret components; a large amount of additives such as porogens need to be added during the preparation process, resulting in The obtained hollow fiber membrane has poor mechanical properties, high production cost and waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The preparation method of the hollow fiber membrane of the present invention adopts a simplified solution spinning method. First prepare the polymer film-forming system according to the formula of the present invention, put it into a syringe or other containers that are convenient for extrusion, and then inject the polymer film-forming liquid from the needle or other pipelines under the action of a syringe pump or other pushes Extrusion, the diameter and shape of the needle or extrusion pipe are not limited, preferably a circular pipe of 0.2 mm to 2 mm, the extruded polymer film-forming system is immersed in pure water or aqueous solution, depending on the additive, can be selected The acidic aqueous solution or the alkaline aqueous solution is solidified and formed through the film-forming system of the aqueous solution, and the additive reacts with water at the same time, and the generated gas expands to form the inner cavity of the hollow fiber membrane, and finally t...

Embodiment 1

[0020] 15wt% polyvinylidene fluoride, 84wt% dimethyl sulfoxide, and 1wt% sodium bicarbonate were placed in a Erlenmeyer flask, stirred with a rotor for 6 hours, and the temperature was 25°C. After the stirring was completed, static defoaming was performed for 10 hours to obtain a film-forming system. Put the prepared film-forming system into the syringe, and then extrude the polymer film-forming liquid from a circular needle with an inner diameter of 0.9 mm under the action of the syringe pump, and immerse the extruded polymer film-forming system until pH=1 The hydrochloric acid aqueous solution is solidified and formed through the film-forming system of the acidic aqueous solution, and the additive reacts with water at the same time, and the generated carbon dioxide gas expands to form the inner cavity of the hollow fiber membrane, and finally obtains the polyvinylidene fluoride hollow fiber membrane.

[0021] Using 50ppm of methyl orange, Congo red and methyl blue aqueous so...

Embodiment 2

[0024]25wt% polysulfone, 73.5wt% N-methylpyrrolidone, and 1.5wt% sodium borohydride were placed in a conical flask and stirred for 4 hours at a temperature of 60°C. After the stirring was completed, static defoaming was performed for 10 hours to obtain a film-forming system. Put the prepared film-forming system into the syringe, and then extrude the polymer film-forming liquid from a circular needle with an inner diameter of 0.9 mm under the action of the syringe pump, and submerge the extruded polymer film-forming system to pH=7 The aqueous solution of the aqueous solution is solidified and formed by the membrane-forming system of the aqueous solution, and the additive reacts with water at the same time, and the generated hydrogen gas expands to form the inner cavity of the hollow fiber membrane, and finally obtains the polysulfone hollow fiber membrane.

[0025] Using 50ppm methyl orange, Congo red and methyl blue aqueous solution, the performance of the polysulfone hollow f...

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PUM

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Abstract

The invention discloses a hollow fiber membrane and a preparation method of the hollow fiber membrane. The hollow fiber membrane is characterized in that a mass percent formula of a membrane forming system comprises the following components in percentage by weight (the sum of the components is 100%): 12-30% of a polymer, 70-88% of an organic solvent and 0-10% of an additive, wherein the polymer is a general membrane forming polymer or a modified product; the organic solvent is a good solvent of the polymer and can be mutually dissolved with water; the additive is a substance capable of reacting with water or a water solution to generate gas. The preparation method is a simplified solution spinning method comprising the steps of: firstly preparing the polymer membrane forming system according to the formula, putting the polymer membrane forming system into an injection syringe or other conveniently-extruded containers, extruding polymer membrane forming liquid from a syringe needle or other pipelines under the pushing action of an injection pump or the other containers, soaking the extruded polymer membrane forming liquid into pure water or a water solution which can be an acid water solution or an alkali water solution according to different additives, solidifying and forming the membrane forming system by virtue of the water solution, meanwhile, reacting the additive with water, forming a cavity of the hollow fiber membrane due to the expansion of the generated gas, and finally obtaining the hollow fiber membrane.

Description

technical field [0001] The invention relates to a hollow fiber membrane and a preparation method thereof, belonging to the technical field of membranes. Background technique [0002] The hollow fiber membrane is like a fiber-like, self-supporting membrane. It is a kind of asymmetric membrane, and its dense layer can be located on the outer surface of the fiber (such as reverse osmosis membrane) or on the inner surface of the fiber (such as microfiltration membrane, nanofiltration membrane and ultrafiltration membrane). For gas separation membranes, the dense layer may be located on the inner or outer surface. The separation principle of the hollow fiber membrane is: the membrane wall is densely covered with micropores, the raw liquid passes through one side of the membrane under a certain pressure, the solvent and small molecular solutes pass through the membrane wall to become the filtrate, and the macromolecular solutes are retained by the membrane to achieve material sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00
Inventor 陈英波张士锋胡欣萍施洋张宇峰
Owner 无锡迈姆润环境科技有限公司
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