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Preparation method of low temperature plasma grafted protein modified polyvinylidene fluoride film

A technology of polyvinylidene fluoride membrane and low-temperature plasma, which is applied in the field of preparation of plasma-grafted protein-modified polyvinylidene fluoride membrane, to achieve good hydrophilicity, large water flux, and improvement of hydrophobic defects

Inactive Publication Date: 2012-06-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are relatively few studies on macromolecules such as proteins, which contain more hydrophilic groups, and there will be greater breakthroughs in the improvement of hydrophilicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 75g of polyvinylidene fluoride, 25g of polyvinylpyrrolidone, and 400g of N,N-dimethylacetamide into the dissolution kettle, and at a temperature of 40°C, swell and dissolve to form a casting solution. The membrane liquid is used after filtration and defoaming. Keep the clean glass plate and scraper at the same temperature as the casting solution. Pour the casting solution on one end of the glass plate and use a scraper to form a uniform liquid film. After pre-evaporating for 10 seconds, immerse it in a water bath. After the green film floated up from the glass plate, it was washed thoroughly with distilled water, soaked to remove the solvent, and dried at room temperature.

[0023] Put the prepared polyvinylidene fluoride-based film into a low-temperature plasma studio, the working pressure of the working gas is 25Pa, the discharge power is 60W, and the treatment time is 100s for plasma surface treatment; after the treatment, the film is taken out and placed in the ...

Embodiment 2

[0026] Put 75g of polyvinylidene fluoride, 15g of polyvinylpyrrolidone, and 400g of N,N-dimethylacetamide into the dissolution kettle, and at a temperature of 40°C, swell and dissolve to make a casting solution. Filter and defoam before use. The casting solution is spun into a hollow fiber membrane through a concentric circular tube spinneret. The membrane forming process is as follows: the metering pump specification is 0.40ml / r, the pump speed is 13r / min, the length of the air section is 200mm, and the temperature of the inner and outer coagulation baths is 60°C Water, spinning speed 30m / min. After the primary film is formed, it can be assembled after being washed with water and pore-preserving treatment and then dried at low temperature. Among them, the filling fluid pressure in the spinneret cavity is 1.5×10 -3 MPa, the filling liquid is 5% ethanol aqueous solution.

[0027] Put the prepared polyvinylidene fluoride-based film into a low-temperature plasma studio, the wo...

Embodiment 3

[0030] Add 100g of polyvinylidene fluoride, 35g of polyvinylpyrrolidone, and 365g of N,N-dimethylacetamide into the dissolution kettle, and make a casting solution by swelling and dissolving at a temperature of 40°C. The casting solution is filtered , Stand-by after defoaming. Keep the clean glass plate and scraper at the same temperature as the casting solution. Pour the casting solution on one end of the glass plate and use a scraper to form a uniform liquid film. After pre-evaporating for 10 seconds, immerse it in a water bath. After the green film floated up from the glass plate, it was washed thoroughly with distilled water, soaked to remove the solvent, and dried at room temperature.

[0031] Put the prepared polyvinylidene fluoride-based film into a low-temperature plasma studio with a working pressure of 20Pa, a discharge power of 120W, and a treatment time of 200S for plasma surface treatment; after the treatment, the film was taken out and exposed to air for 3 minute...

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PUM

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Abstract

The invention discloses a preparation method of a low temperature plasma grafted protein modified polyvinylidene fluoride film. The preparation method comprises the following steps: putting a polyvinylidene fluoride film into a plasma working chamber for 10-600 seconds, and carrying out plasma surface treatment; taking the film out, exposing in air for 0-10 minutes, immersing into protein solution, and carrying out grating reaction; and taking the film out, and rinsing by distilled water repeatedly. The depth of the action of the low temperature plasma to the material surface is only 10 nanometers, so that the properties of a matrix cannot be affected. The preparation method has a simple process, is convenient to operate, has low chemicals consumption, is water-saving and energy-saving, and has higher reliability and safety, small environment pollution and broad application prospect.

Description

technical field [0001] The invention relates to a modification technology of a membrane product, in particular to a preparation method of a plasma-grafted protein-modified polyvinylidene fluoride membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) is an emerging film material with excellent comprehensive properties. It has high mechanical strength, acid and alkali resistance and other harsh environmental conditions and good chemical stability. It has outstanding dielectric properties, biocompatibility, resistance The characteristics of heat, high separation precision and high efficiency are the preferred materials for preparing membranes. [0003] PVDF membrane has extremely low surface energy and good hydrophobicity, and is widely used in various water purification treatments; PVDF membrane is an ideal membrane for non-aqueous system separation processes such as membrane distillation, membrane absorption, and organic solvent purification. In addition, PV...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/34
Inventor 孙俊芬童发钦何春菊
Owner DONGHUA UNIV
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