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A kind of preparation method of polyvinylidene fluoride hydrophilic stretch film

A technology of polyvinylidene fluoride and stretched membrane, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low water flux, low filtration efficiency, low efficiency, etc., and achieve easy promotion and use, The effect of high filtration efficiency and simple operation process

Active Publication Date: 2022-07-22
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the post-finishing hydrophilic finishing agents selected by most researchers are mostly surfactants. The polyvinylidene fluoride nano-membrane after surfactant treatment has good hydrophilicity, but the water flux is not very high, and the filtration efficiency is too low. Many polyvinylidene fluoride nano-membranes are used for water filtration or oil-water separation. If the efficiency is too low in industrial use, the cost will be high and it will not be cost-effective. Based on this, how to develop high-flux membranes Polyvinylidene fluoride hydrophilic membrane has become a research hotspot in the modification of polyvinylidene fluoride nano-membrane

Method used

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  • A kind of preparation method of polyvinylidene fluoride hydrophilic stretch film
  • A kind of preparation method of polyvinylidene fluoride hydrophilic stretch film
  • A kind of preparation method of polyvinylidene fluoride hydrophilic stretch film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) PVDF, hydrophilic SiO 2 Dissolved in DMF and acetone with heating and stirring for 4h, then without heating and stirring for 20h, after fully stirring, the PVDF concentration in the solution was 10wt%, hydrophilic SiO 2, The quality of: PVDF quality = 1:100, DMF , The mass of : the mass of acetone = 1:1, and then electrospun into PVDF nanomembrane;

[0026] (2) adding PVP and KH560 into deionized water and stirring to form a hydrophilic finishing agent; wherein the PVP concentration is 0.5wt%, and the KH560 concentration is 4g / L;

[0027] (3) Hydrophilic finishing of the polyvinylidene fluoride nanomembrane: the PVDF nanomembrane was soaked in ethanol for 1 min, placed in a hydrophilic finishing agent for 6 min, taken out and placed in a blast drying oven at 70 °C for 35 min , and after drying, the longitudinal and transverse directions were respectively stretched to 120% of the original film to obtain a polyvinylidene fluoride hydrophilic stretched film.

[0028...

Embodiment 2

[0032] (1) PVDF, hydrophilic SiO 2 Dissolved in DMF and acetone with heating and stirring for 3h, then without heating and stirring for 19h, after fully stirring, the PVDF concentration in the solution was 10wt%, and the hydrophilic SiO 2, The quality of: PVDF quality = 1:100, DMF , The mass of : the mass of acetone = 1:1, and then electrospun into PVDF nanomembrane;

[0033] (2) adding PVP and KH560 into deionized water and stirring to form a hydrophilic finishing agent; wherein the concentration of PVP is 2wt%, and the concentration of KH560 is 6g / L;

[0034] (3) Hydrophilic finishing of the polyvinylidene fluoride nanomembrane: the PVDF nanomembrane was soaked in ethanol for 1 min, placed in a hydrophilic finishing agent for 5 min, taken out and placed in a blast drying oven at 70 °C for 25 min , and after drying, stretch it longitudinally and transversely to 115% of the original film respectively, to obtain a polyvinylidene fluoride hydrophilic stretched film.

[0035] ...

Embodiment 3

[0037] (1) PVDF, hydrophilic SiO 2 Dissolved in DMF and acetone, heated and stirred at 70°C for 4 hours, and then stirred without heating for 18 hours. After fully stirring, the PVDF concentration in the solution was 10wt%, and the hydrophilic SiO 2, The mass of: PVDF mass = 1:100, DMF mass: acetone mass = 1:1, and then electrospin into PVDF nanomembrane;

[0038](2) adding PVP and KH560 into deionized water and stirring to form a hydrophilic finishing agent; wherein the concentration of PVP is 1wt%, and the concentration of KH560 is 2g / L;

[0039] (3) Hydrophilic finishing of the polyvinylidene fluoride nanomembrane: the PVDF nanomembrane was soaked in ethanol for 1 min, placed in a hydrophilic finishing agent for 10 min, taken out and placed in a blast drying oven at 70°C for 30 min , and after drying, stretch it to 125% of the original length in the longitudinal and transverse directions respectively to obtain the polyvinylidene fluoride hydrophilic stretched film.

[004...

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Abstract

The invention discloses a preparation method of a polyvinylidene fluoride hydrophilic stretched film. The method comprises the following steps: (1) combining PVDF, hydrophilic SiO 2 Dissolve in DMF and acetone with heating and stirring for 3-4h and then without heating and stirring for 18-20h to obtain PVDF solution, which is electrospun into PVDF nanofilm; (2) PVP and KH560 are added to deionized water in a certain amount and stirred to prepare a hydrophilic (3) The PVDF nanofilm is soaked in ethanol and then placed in a hydrophilic finishing agent. After drying, longitudinal and transverse stretching is performed to obtain a polyvinylidene fluoride hydrophilic stretched film. The polyvinylidene fluoride membrane obtained by the invention has excellent hydrophilic effect and high water flux, and can be used in the fields of liquid filtration, water filtration and the like.

Description

technical field [0001] The invention belongs to a preparation method of a functional nano-film, in particular to a preparation method of a polyvinylidene fluoride hydrophilic stretched film. Background technique [0002] In recent years, nonwovens have developed rapidly, among which electrospun nanofiber membranes have attracted more and more attention, and have been used in many fields with extremely fast growth. Electrospinning nanofiber membranes are ubiquitous in current life, such as mask production, air purifier filters, mask cloths, nanofiber membrane water purifiers, anti-haze windows, etc., which have provided us with countless conveniences. Electrospinning Polyvinylidene fluoride (PVDF) fiber membrane has the advantages of large specific surface area, high porosity, good electrolyte wettability, good acid and alkali resistance, etc. However, because PVDF itself has no hydrophilic group, the membrane itself shows The strong hydrophobicity makes the polyvinylidene f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/02
CPCB01D71/34B01D67/0079B01D69/02B01D2323/02B01D2325/36
Inventor 冯建永许瑞祥李圣泉张凌霄王文富
Owner ZHEJIANG SCI-TECH UNIV