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 membra

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

Example Embodiment

[0037] Example 1

[0038] PVDF (viscosity average molecular weight M v =431,000g / mol) dissolved in a mixture of triethyl phosphate and ethanol at 90℃, the weight ratio of raw materials is: PVDF: triethyl phosphate: ethanol=15:82:3, stir until PVDF is completely dissolved , After standing for deaeration, scrape it on a clean and flat glass plate with a spatula. Immerse the scraped membrane solution into the first gel bath for 10 minutes. The temperature of the first gel bath is 20°C. The composition of the gel bath is: 75% aqueous solution of triethyl phosphate with a mass percentage concentration of 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 for more than 24 hours at room temperature to completely exchange the solvent. Dry the rinsed membrane at room temperature to obtain a microporous membrane with a certain pore size distribution. The structure of t...

Example Embodiment

[0042] Example 2

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

[0044] Table 2 Various properties of the film prepared in Example 2

...

Example Embodiment

[0046] Example 3

[0047] PVDF (viscosity average molecular weight M v =789,000g / mol) dissolved in triethyl phosphate at 80°C, the weight ratio of raw materials is: PVDF: triethyl phosphate=16:84, stir until PVDF is completely dissolved, stand for deaeration and scrape with a spatula On a clean and flat glass plate. The following steps are the same as in Example 1. The structure of the resulting film is Figure 5 , Image 6 As shown, the results obtained from the performance test are shown in Table 3.

[0048] Table 3 Various properties of the film prepared in Example 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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