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Method for preparing surface self-cleaning polymer porous membrane

A technology of porous membrane and polymer, which is applied in the field of preparation of surface self-cleaning polymer porous membrane, which can solve the problems of ignoring surface hydrophobicity, decrease of membrane flux, shortening membrane life, etc. sexual effect

Inactive Publication Date: 2010-09-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hydrophobicity of the surface of polymer materials, there will be two problems in the application of water phase separation systems such as water treatment, biology, and food: one is the high mass transfer driving force and high energy consumption; the other is that it is very easy to adsorb Hydrophobic organics cause membrane fouling, resulting in decreased membrane flux and shortened membrane life
Although the modified surface can achieve a more obvious self-cleaning effect, it ignores the surface hydrophobicity of PNIPAAm above the LCST, and the surface contamination and difficulty of cleaning caused by this hydrophobicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Grafting on the surface of the polymer porous membrane: Place the polymer porous membrane in the plasma reaction chamber, and under the conditions of a plasma treatment power of 1W and a treatment time of 20 minutes in an Ar atmosphere at a pressure of 5 Pa, the The film surface initiates the generation of free radicals. Under an Ar atmosphere, the polymer porous film with free radicals generated on the surface was immersed in an aqueous solution containing 5% by weight of N-isopropylacrylamide (NIPAAm) and 0.025% of acrylamide for polymerization for 24 hours. PNIPAAm surface grafted polymer porous membrane.

[0027] Hydrophilic modification of PNIPAAm graft chain: Polyethylene glycol monomethyl ether (MPEG) was added dropwise to equimolar toluene diisocyanate, and reacted at 70°C for 6 hours under the catalysis of stannous octoate to obtain isocyanate-terminated polyethylene Glycol monomethyl ether (NCO-MPEG). The PNIPAAm grafted polymer porous membrane was reacted with...

Embodiment 2

[0029] Grafting on the surface of the polymer porous membrane: Place the polymer porous membrane in the plasma reaction chamber, and under the conditions of a plasma treatment power of 1W and a treatment time of 30 minutes under an Ar atmosphere at a pressure of 5 Pa, the The film surface initiates the generation of free radicals. Under an Ar atmosphere, the polymer porous film with free radicals generated on the surface was immersed in an aqueous solution containing 10% by weight of N-isopropylacrylamide (NIPAAm) and 0.05% of acrylamide for polymerization for 20 hours. PNIPAAm surface grafted polymer porous membrane.

[0030] Hydrophilic modification of PNIPAAm graft chain: Add polyethylene glycol monomethyl ether (MPEG) dropwise to equimolar toluene diisocyanate, and react under the catalysis of dibutyltin dilaurate at 60°C for 10 hours to obtain isocyanate seal End polyethylene glycol monomethyl ether (NCO-MPEG). The polymer porous membrane grafted with PNIPAAm was reacted w...

Embodiment 3

[0032] Grafting on the surface of the polymer porous membrane: Place the polymer porous membrane in the plasma reaction chamber, and under the conditions of a plasma treatment power of 1W and a treatment time of 20 minutes in an Ar atmosphere at a pressure of 5 Pa, the The film surface initiates the generation of free radicals. In an Ar atmosphere, the polymer porous film that generates radicals on the surface is immersed in an aqueous solution containing 8% by weight of N-isopropylacrylamide (NIPAAm) and 0.035% of acrylamide for polymerization for 24 hours to prepare PNIPAAm surface grafted polymer porous membrane.

[0033] Hydrophilic modification of PNIPAAm graft chain: Polyethylene glycol monomethyl ether (MPEG) was added dropwise to equimolar toluene diisocyanate, and reacted at 70°C for 6 hours under the catalysis of stannous octoate to obtain isocyanate-terminated polyethylene Glycol monomethyl ether (NCO-MPEG). The polymer porous membrane grafted with PNIPAAm was reacte...

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Abstract

The invention discloses a method for preparing a surface self-cleaning polymer porous membrane, which comprises the following steps of: grafting temperature-sensitive poly(N-isopropylamide) on the surface of a polymer porous membrane surface; and connecting hydrophilic polyelycol side-chain with a PNIPAAm grated chain. Due to the introduction of the hydrophilic hydrophilic on the PNIPAAm grated chain, the surface vulnerability caused by the hydrophobicity of the PNIPAAm at a low critical soluble temperature (LCST) is overcome, and the non-vulnerability and self-cleaning property of the surface of the modified polymer porous membrane are realized by using the surface hydrophilicity of the PNIPAAm below the LCST and the mechanical force supplied by the expansion / curling conversion of the PNIPAAm molecular chain in a volume phase conversion process. The aim of surface self-cleaning can be achieved when the modified porous membrane is washed in a variable-temperature way in water at a temperature close to the LCST, and the self-cleaning process has the characteristics of simplicity and environmental friendliness.

Description

Technical field [0001] The invention relates to a method for preparing a porous membrane, and more specifically to a method for preparing a self-cleaning polymer porous membrane. Background technique [0002] Membrane separation technology has the advantages of low energy consumption, simple process, high separation efficiency, and no environmental pollution. It is an important high and new technology to solve contemporary energy, resources and environmental problems. Its application has been developed to chemical, food, medicine, biochemical, environmental protection, etc. field. Polymer materials have been widely used to prepare porous separation membranes due to their excellent performance, low price, and easy processing. However, because the surface of polymer materials is mostly hydrophobic, two problems will arise when used in water treatment, biological, food and other aqueous phase separation systems: one is the high driving force for mass transfer and high energy consum...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D71/82B01D67/00
Inventor 黄健叶远松王晓琳
Owner NANJING UNIV OF TECH