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Antipollution self-cleaning polyvinylidene fluoride membrane and method for producing same

A technology of polyvinylidene fluoride film and polyvinylidene fluoride, which is applied in the field of anti-pollution self-cleaning polyvinylidene fluoride film and its preparation, can solve the problems of human body harm and easy structure damage, and achieve easy operation and easy Effect of industrial implementation, good anti-pollution performance

Inactive Publication Date: 2012-07-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of polymers is easily damaged under long-term irradiation, and these ions are harmful to the human body, which limits the application of these technologies to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The actual anti-pollution PVDF film preparation method of the present invention comprises following process:

[0024] (1) Dissolve PVDF powder, a certain amount of azo or peroxide initiator and pore forming agent in a strong polar solvent such as dimethylformamide or dimethylacetamide, and configure it to 10-20% PVDF solution, stirred at 65°C until uniform. Degas the solution, scrape the film at 65°C, remove the solvent and dry it to obtain the PVDF film.

[0025] (2) Chemical modification of the PVDF membrane surface: put the original PVDF membrane containing the initiator into a reaction bottle containing a mixed solution of methanol and water, and add a hydrophilic monomer. Nitrogen was passed to exclude the air, and then the temperature was raised to above 65°C for reaction. The reacted membrane is washed several times with sufficient stirring, and then dried to obtain an anti-pollution self-cleaning PVDF membrane.

Embodiment 1

[0028] 1) Preparation of PVDF membrane containing AIBN initiator: Take 4g of PVDF powder, 0.2g of AIBN dissolved in 22ml of N,N-dimethylacetamide (DMAc), and prepare 18% PVDF casting solution, and stir until uniform at 35°C . The casting solution was degassed in vacuum, scraped onto the glass plate with a spatula with a thickness of 300 μm, and placed in a 35° coagulation bath (DMAc / water=30 / 70, w / w). After the membrane is detached from the glass plate, soak in deionized water for 48 hours to remove the residual solvent, and dry to obtain the PVDF membrane containing the initiator.

[0029] 2) Chemical modification of PVDF membrane surface: Put 3 pieces of PVDF original membranes (3cm×3cm) containing AIBN into a three-necked flask containing 30ml of a mixed solution of methanol and water (30 / 70, w / w), and add 1.25g of sulfobetaine methacrylate (SBMA). Nitrogen was passed for 30 minutes to remove the air, and then the flask was moved into a 70° oil bath to react for 5 hours. ...

Embodiment 2

[0032] 1) Preparation of PVDF membrane containing AIBN initiator: Take 4g of PVDF powder, 1g of AIBN dissolved in 22ml of N,N-dimethylacetamide (DMAc), and make 18% PVDF casting solution, stir at 35℃ until uniform. The casting solution was degassed in vacuum, scraped onto the glass plate with a spatula with a thickness of 300 μm, and placed in a 35° coagulation bath (DMAc / water=30 / 70, w / w). After the membrane is detached from the glass plate, soak in deionized water for 48 hours to remove the residual solvent, and dry to obtain the PVDF membrane containing the initiator.

[0033] 2) Chemical modification of PVDF membrane surface: same as step 2 of Example 1.

[0034] After testing, the contact angle between the PVDF membrane and water dropped to 58° after surface modification in this embodiment, and the contact angle decreased rapidly with time, and it was only 17° at 120 seconds. Using bovine serum albumin (BSA) as a pollutant, it was determined that the anti-protein foulin...

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PUM

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Abstract

The invention discloses an antipollution self-cleaning polyvinylidene fluoride membrane and a method for producing the same, wherein a raw polyvinylidene fluoride membrane which contains initiator is firstly produced, and then radical polymerization is initiated on the surface of the raw polyvinylidene fluoride membrane, so the antipollution self-cleaning polyvinylidene fluoride membrane can be obtained. The technology of the method is simple, the method is easy to operate, expansive instruments are not required, the method is easy to industrially carry out, the produced antipollution self-cleaning polyvinylidene fluoride membrane has good antipollution performance, the main chain structure of polyvinylidene fluoride is kept undamaged, so the good physical properties of the polyvinylidene fluoride membrane are maintained.

Description

technical field [0001] The invention belongs to the field of polymer modification, and in particular relates to an anti-pollution self-cleaning polyvinylidene fluoride film and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a commonly used synthetic polymer film-forming material with good mechanical properties, thermal stability, solvent resistance, and microbial corrosion resistance. However, due to its low surface energy and strong hydrophobic properties, its anti-fouling and biocompatibility are poor, and the polymer porous membrane prepared by it is easy to cause non-specific protein adsorption in practical applications, which limits the membrane in Applications in many ways. [0003] There are many ways to modify PVDF membranes, and surface chemical modification is one of the most important methods. At present, surface chemical modification is mainly through plasma, ozone and other pretreatments, introducing initiation po...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 张其清李建华李弥滋邵喜胜
Owner FUZHOU UNIV
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