Preparation method of modified polyacrylonitrile film

A polyacrylonitrile membrane and polyacrylonitrile technology, applied in the field of membrane materials, can solve problems such as difficult degradation, less obvious hydrophilic effect, environmental hazards, etc., and achieve low processing cost, good hydrophilic effect improvement, and environmental friendliness Effect

Inactive Publication Date: 2012-02-22
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of these blended polymers are that the hydrophilic effect is not obvious, and it is difficult to degrade, and the waste film will cause certain harm to the environment.

Method used

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  • Preparation method of modified polyacrylonitrile film

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preparation example Construction

[0012] The preparation method (abbreviation preparation method) of the modified polyacrylonitrile film (abbreviation modified film) of the present invention's design, comprises following processing steps:

[0013] 1. Prepare the hydrophilic material solution: first cut the hydrophilic material or fiber into a length of 2-10mm, preferably 3-8mm, then add it to the co-solvent and stir to dissolve it. After the dissolution is complete, you can get Hydrophilic material solution; the hydrophilic material refers to a polymer with carboxyl, amino or hydroxyl groups in the main chain or side chain, including at least one of mulberry silk fibroin, tussah silk fibroin or spider silk fibroin The silk fibroin is a long-bond macromolecule composed of a variety of α-amino acid residues linked by amide bonds, also known as a peptide chain, and its hydrolyzed products mainly include glycine, alanine, phenylalanine and glutamine Acid; said co-solvent refers to the common solvent of film-formin...

Embodiment 1

[0024] (1) Preparation of hydrophilic material solution (the same below): Add 0.75 g of silk fibroin short fibers, a hydrophilic material with a length of 3-8 mm, to 85.00 g of a NaSCN aqueous solution with a concentration of 55% by mass, and heat at 80° C. Dissolve for 0.5 h to obtain a hydrophilic material solution with a mass concentration of 0.9%.

[0025] (2) Preparation of the blend solution (the same below): add 14.25g of PAN powder to the hydrophilic material solution, stir at 70°C for 2.5h, vacuum insulate at -0.08MPa, 70°C, and statically defoam for 20h to obtain hydrophilic A blend solution in which the material accounts for the total mass percentage of the blend with a concentration of 5%.

[0026] (3) Scraping film and post-treatment (the same below): Under the conditions of 25±2°C and 70% humidity, use the L-S phase inversion method to scrape the film on the glass plate, and then immerse the glass plate and the film on it into the distilled water coagulation bath...

Embodiment 2

[0028] (1) Add 0.75 g of mulberry silk fibroin short fibers with a length of 3-8 mm to 85.00 g of NaSCN aqueous solution with a mass percentage concentration of 50%, and dissolve it for 1.0 h at 70°C to obtain a hydrophilic material with a mass concentration of 0.9% solution.

[0029] (2) Add 14.25g of PAN powder to the hydrophilic material solution, stir at 60°C for 3.0h, vacuum insulate at -0.05MPa, 60°C, and stand for 25h of defoaming to obtain the concentration of the hydrophilic material in the total mass percentage of the blend 5% blend.

[0030] (3) Under the conditions of 25±2°C and 70% humidity, use the L-S phase inversion method to scrape the film on the glass plate, then immerse the glass plate and the film on the glass plate and the film on the glass plate with a mass concentration of 50% in ethanol aqueous solution, and wait for it to naturally Take it out after peeling off, and soak it in 50% ethanol aqueous solution for 24 hours to obtain the modified membrane ...

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Abstract

The invention discloses a preparation method of a modified polyacrylonitrile film, and the process comprises the following steps: 1. hydrophilic material solution preparation, that is cutting a hydrophilic material into a length of 2-10 mm, adding into a cosolvent, stirring and dissolving; wherein the hydrophilic material is natural high-molecular polymer with a carboxyl, an amino or a hydroxyl on a main chain or a side chain, and comprises at least one of bombyx mori silk fibroin, tussah silk fibroin, or spider silk fibroin; the cosolvent is a common solvent for polyacrylonitrile and the hydrophilic material, comprises a NaSCH aqueous solution or a ZnCl2 aqueous solution, and has a mass concentration of 50-60%; the dissolving temperature is 70-90 DEG C, and the time is 0.5-1 h; the mass concentration of the hydrophilic material solution is 0.5-3%; 2. blended solution preparation, that is adding polyacrylonitrile into the hydrophilic material solution, stirring and dissolving, performing heat preservation under vacuum, allowing the solution to stand for deaeration so as to obtain the blended solution; 3. routine film scraping and posttreatment.

Description

technical field [0001] The invention relates to membrane material technology, in particular to a preparation method of a modified polyacrylonitrile membrane. Background technique [0002] Polyacrylonitrile (PAN) has excellent film-forming properties, light resistance, weather resistance and mold resistance, and is an ideal film-making material. PAN porous membrane is widely used in food, chemical, pharmaceutical and water treatment industries. [0003] Compared with hydrophobic polymers, PAN has a certain degree of hydrophilicity due to the cyano group (-CN), but the hydrophilicity is not strong. With the continuous expansion of the application field of membrane technology, the requirement for membrane hydrophilicity is getting higher and higher. The higher the hydrophilicity of the membrane, the greater the flux, the better the pollution resistance, and thus the higher its application efficiency in industry. Therefore, it is of great significance to prepare better hydrop...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D69/06
Inventor 肖长发张静王健徐乃库
Owner TIANJIN POLYTECHNIC UNIV
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