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Method for preparing skin-free homogeneous structural polyvinylidene fluoride transfer film

A technology of polyvinylidene fluoride and transfer membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve uniform pore size, stable structure and performance, and high porosity

Inactive Publication Date: 2010-10-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on the targeted preparation of PVDF porous membranes with symmetrical structures and networks for immobilizing proteins.

Method used

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  • Method for preparing skin-free homogeneous structural polyvinylidene fluoride transfer film
  • Method for preparing skin-free homogeneous structural polyvinylidene fluoride transfer film
  • Method for preparing skin-free homogeneous structural polyvinylidene fluoride transfer film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] PVDF (viscosity average molecular weight M v =431,000g / mol) was dissolved in the mixture of triethyl phosphate and ethanol at 90°C, the weight ratio of raw materials was: PVDF: triethyl phosphate: ethanol=15:82:3, stirred until PVDF was completely dissolved , after standing for defoaming, scrape it on a clean and flat glass plate with a scraper. Immerse the scraped film liquid in the first gel bath for 10 minutes, the first gel bath temperature is 20°C, the composition of the gel bath is: the mass percent concentration is an aqueous solution of 75% triethyl phosphate, to obtain nascent ecology membrane. The nascent membrane was then immersed in a second gel bath containing only deionized water at 20°C for 2 hours. Finally, the membrane was rinsed with tap water at room temperature for more than 24 hours to completely exchange the solvent. Dry the membrane after rinsing at room temperature to obtain a microporous membrane with a certain pore size distribution. The str...

Embodiment 2

[0043] PVDF (viscosity average molecular weight M v =431,000g / mol) was dissolved in the mixture of dimethylformamide and ethanol at 70°C, the weight ratio of raw materials was: PVDF: dimethylformamide: ethanol = 16 ~ 81 ~ 3, stirred until PVDF Dissolve completely, let it stand for defoaming, and then scrape it on a clean and flat glass plate with a spatula. Immerse the scraped membrane solution in the first gel bath for 10 minutes, the temperature of the first gel bath is 20° C., and the composition is an aqueous solution with a mass percentage concentration of 60% dimethylformamide to obtain a nascent membrane. Then the nascent film was immersed in the second gel bath with a temperature of 40° C. and an aqueous solution with a concentration of 10% dimethylformamide by mass for 2 hours. The following steps are the same as Example 1. The results obtained are shown in Table 2 and attached image 3 , Figure 4 .

[0044] The various performances of the prepared membrane of t...

Embodiment 3

[0047] PVDF (viscosity average molecular weight M v =789,000g / mol) was dissolved in triethyl phosphate at 80°C, the weight ratio of raw materials was: PVDF:triethyl phosphate=16:84, stirred until the PVDF was completely dissolved, and scraped with a scraper after standing for defoaming on a clean, flat glass plate. The following steps are the same as Example 1. The structure of the obtained membrane is as Figure 5 , Figure 6 As shown, the performance test results are shown in Table 3.

[0048] The various performances of the prepared membrane of table 3 embodiment 3

[0049]

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Abstract

The invention discloses a method for preparing a skin-free homogeneous structural polyvinylidene fluoride transfer film, which comprises the following steps of: (1) mixing raw materials, stirring the raw materials uniformly at the temperature of between 60 and 140 DEG C, standing and de-foaming the mixture to obtain polyvinylidene fluoride film-making solution, and standing the film-making solution for later use; (2) scraping the film-making solution on a clean and flat glass plate, wherein the thickness of the film solution is 300 to 700 microns; (3) dipping the scraped film solution into a first gel bath, and soaking the film solution for 0.05 to 48 hours at the temperature of between 0 and 30 DEG C to obtain a coarse ecological film; (4) dipping the coarse ecological film into a second gel bath, and soaking the coarse ecological film for 0.1 to 2 hours at the temperature of between 5 and 70 DEG C; and (5) soaking the film into purified water for at least 24 hours, fully displacing the residual organic solvent and additive, then taking the film out, and naturally airing the film to obtain the homogeneous network structural polyvinylidene fluoride transfer film. The preparation method has simple process and low production cost, and the prepared polyvinylidene fluoride transfer film has high strength and high protein adsorption quantity.

Description

technical field [0001] The invention relates to a preparation method of a polymer film, in particular to a preparation method of a polyvinylidene fluoride transfer film with a uniform structure without a skin layer. Background technique [0002] Polyvinylidene fluoride (PVDF) has excellent chemical stability and thermal stability. Its performance is basically unchanged after being irradiated with ultraviolet lamps with a wavelength of 20-400nm for one year. It is not resistant to strong oxidants such as acids and alkalis and halogens at room temperature. corrosion. In view of the above advantages, PVDF membranes have been widely used since the mid-1980s. In recent years, PVDF has been successfully used in wastewater treatment, industrial gas filtration, medicine and food industry. At the same time, due to the hydrophobicity and electrostatic adsorption of the PVDF material, it has a strong adsorption capacity for proteins, so it has also been used in protein adsorption sep...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00
Inventor 张林叶茜陈欢林
Owner ZHEJIANG UNIV
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