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
6 Cites 6 Cited by

AI-Extracted Technical Summary

Problems solved by technology

There are few reports on the targeted preparation of PVDF porous membra...
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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.

Application Domain

Semi-permeable membranes

Technology Topic

Polyvinylidene fluorideChemistry +7

Image

  • 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(5)
  • Comparison scheme(1)

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 the membrane is as figure 1 , figure 2 Shown.
[0039] Cut a circular membrane with a diameter of 7 cm and put it in an ultrafiltration cup. The membrane is first pre-pressed at 0.15 MPa for 30 minutes until the water flux is basically stable, and then measured at 0.1 MPa. The cross section of the film is broken by the sample in liquid nitrogen, and the surface to be observed is gold-plated by a sputtering coater in a vacuum environment. After processing, the sample was scanned and imaged under an accelerating voltage of 5kV. Put the dried microporous membrane into a protein solution of a certain concentration and statically adsorb for 5 hours, detect the amount of protein change in the solution before and after adsorption, and calculate the amount of protein adsorption per unit area of ​​the membrane. The results obtained are shown in Table 1.
[0040] Table 1 Various properties of the film prepared in Example 1
[0041]

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
[0045]

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]

PUM

PropertyMeasurementUnit
Viscosity average molecular weight400000.0 ~ 900000.0

Description & Claims & Application Information

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