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Method for depositing, crosslinking and modifying chitosan on surface of polypropylene porous membrane

A technology of cross-linking modification and polypropylene, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve the problems of complex equipment, cumbersome operation steps, and high cost, and achieve long-lasting hydrophilic and antibacterial properties. The treatment effect is reliable and the effect of prolonging the service life

Inactive Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Blending polypropylene and hydrophilic polymers to make membranes can endow polypropylene separation membranes with lasting hydrophilicity, but the disadvantage is that the blended components need to be able to co-crystallize with polypropylene and not be destroyed at high temperatures, otherwise it will Affect the degree of crystallization of polypropylene, reduce the mechanical properties of polypropylene separation membrane and the effect of hydrophilic modification, and the membrane parameters need to be readjusted, the process is more complicated; hydrophilic substances such as ethanol, some surfactants are used or amphiphilic solvent etc. to soak the polypropylene porous membrane, the hydrophilic modification method is simple but easy to be eluted and lost, so that the hydrophilicity of the polypropylene porous membrane disappears; the persistent hydrophilic modification method such as triggering Agent-induced grafting, ozone treatment, radiation (ultraviolet light, electron beam, ion beam, γ-ray) treatment, low-temperature plasma treatment, etc. can improve the surface hydrophilicity of polypropylene porous membrane, and introduce groups on the surface of polypropylene porous membrane. The species and the degree of grafting on the surface of the polypropylene porous membrane are important parameters that determine the effect of the hydrophilic modification of the polypropylene porous membrane. At the stage of processing the polypropylene porous membrane, the uniformity of the hydrophilic modification effect of the polypropylene porous membrane, the structure control of the surface of the polypropylene porous membrane and the treatment effect of the internal pores of the polypropylene porous membrane need further research.
[0005] In addition, the complex pollution situation of polypropylene porous membrane is not enough to solve this problem only by improving the hydrophilic property of polypropylene porous membrane. The preparation technology of polypropylene porous membrane with both hydrophilic property and anti-microbial pollution performance has not been seen so far. to report
At present, no cost-effective and easy-to-operate method for preparing polypropylene separation membranes with hydrophilic surface and antibacterial modification has been developed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The flux of pure water is stabilized at 495.1L / h.m 2 , a polypropylene hollow fiber membrane with a contact angle of 120.7°, an average inner diameter of membrane filaments of 1.0 mm, an outer diameter of 1.7 mm, and a membrane pore diameter of 0.2 μm was placed in glutaraldehyde crosslinking agent solution 1 with a mass concentration of 50%, soaked After 24 hours, take it out and dry it for later use;

[0058] Take a certain amount of chitosan and dissolve it in an acidic aqueous solution of acetic acid with a mass concentration of 5% to prepare a uniform chitosan or chitosan derivative solution with a mass concentration of 2%. The pretreated polypropylene The porous membrane is dropped into chitosan or chitosan derivative solution, and chitosan or chitosan derivative is deposited on the surface of the polypropylene porous membrane and in the film pores for 12 hours, then taken out and dried for use;

[0059] Immerse the polypropylene porous membrane deposited with ch...

Embodiment 2

[0063] The flux of pure water is stabilized at 731.8L / h.m 2 , a polypropylene hollow fiber membrane with a contact angle of 127.2°, an average inner diameter of membrane filaments of 0.9mm, an outer diameter of 1.5mm, and a membrane pore diameter of 0.2μm was placed in formaldehyde crosslinking agent solution 1 with a mass concentration of 10%, and soaked for 36 hours After that, take it out and dry it for later use;

[0064] Weigh a certain amount of chitosan and hydroxypropyl chitosan (the ratio of chitosan and hydroxypropyl chitosan is arbitrary) and dissolve it in an acidic aqueous solution of formic acid with a mass concentration of 1%, and prepare a mass concentration of 1% uniform chitosan or chitosan derivative solution, put the pretreated polypropylene porous membrane into chitosan or chitosan derivative solution, so that chitosan or chitosan derivative The surface of the porous propylene membrane and the deposition in the pores of the membrane were taken out after 1...

Embodiment 3

[0069] The flux of pure water is stabilized at 1080L / h.m 2 , a polypropylene hollow fiber membrane with a contact angle of 108.4°, an average inner diameter of membrane filaments of 0.9mm, an outer diameter of 1.4mm, and a membrane pore diameter of 0.3μm was placed in glyoxal crosslinking agent solution 1 with a mass concentration of 20%, soaked After 48 hours, take it out and dry it for later use;

[0070] Take a certain amount of chitosan and dissolve it in an acidic aqueous solution of hydrochloric acid with a mass concentration of 10%, and prepare a uniform chitosan or chitosan derivative solution with a mass concentration of 10%. The pretreated polypropylene The porous membrane is dropped into chitosan or chitosan derivative solution, and chitosan or chitosan derivative is deposited on the surface of the polypropylene porous membrane and in the film pores for 5 hours, then taken out, and dried for use;

[0071] Immerse the polypropylene porous membrane deposited with chi...

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Abstract

The invention relates to a method for modifying surface of a polypropylene porous membrane, and concretely relates to a method for depositing, crosslinking and modifying chitosan on surface of the polypropylene porous membrane. The method takes chitosan or a chitosan derivative as a modifier, the polypropylene porous membrane is immersed in a cross-linking agent solution 1 for pretreatment, then placed in a chitosan or chitosan derivative solution , the chitosan or the chitosan derivative are uniformly deposed on the surface and in the membrane pore of the polypropylene porous membrane, under existence of a catalyst, a crosslinking reaction is carried out in a cross-linking agent solution 2, immersion is carried out in an alkaline aqueous solution, and steps of washing and drying are carried out to obtain the modified polypropylene porous membrane having dual performance of hydrophillicity and antibiosis. According to the invention, modification technology is simple, processing effect is reliable, complex equipment is not required, and the method is suitable for industrial large-scale application.

Description

technical field [0001] The invention relates to a method for modifying the surface of a polypropylene porous membrane, in particular to a method for modifying the surface of a polypropylene porous membrane by depositing and crosslinking chitosan. In particular, it refers to a method for hydrophilic antibacterial modification of chitosan deposition / crosslinking on the surface of a polypropylene porous membrane. Background technique [0002] Polypropylene has attracted the attention of membrane scientists because of its good mechanical properties and chemical stability, as well as the advantages of low price. At present, this type of material has been successfully used to prepare polymer microporous membrane separation materials such as microfiltration membranes and ultrafiltration membranes, and is widely used in water treatment, membrane distillation, pervaporation, enzyme immobilization, biopharmaceutical separation and other fields. Due to the lack of suitable solvents fo...

Claims

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Application Information

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IPC IPC(8): B01D71/76B01D69/08B01D67/00
Inventor 杨丽奚振宇魏昕侯秀华
Owner CHINA PETROLEUM & CHEM CORP
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