Durable polyvinylidene fluoride three-layer composite hydrophilic film and preparation method thereof

A technology of polyvinylidene fluoride and layer compounding, which is applied in general water supply saving, rayon manufacturing, filament/thread forming, etc., can solve the problems of poor durability, achieve hydrophilicity, simple operation process, and small pore size Effect

Active Publication Date: 2021-06-11
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-membranes treated with surfactants have good initial hydrophilicity, but there is a problem of poor durability after finishing, while Many polyvinylidene fluoride nano-membranes are used for water filtration or oil-water separation, etc. They are used multiple times in industry, and few are disposable, which can save costs

Method used

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  • Durable polyvinylidene fluoride three-layer composite hydrophilic film and preparation method thereof
  • Durable polyvinylidene fluoride three-layer composite hydrophilic film and preparation method thereof
  • Durable polyvinylidene fluoride three-layer composite hydrophilic film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) PVDF, hydrophilic SiO 2 Dissolve in DMF and acetone, heat and stir for 4 hours, then stir without heating for 20 hours, after fully stirring, make the concentration of PVDF in the solution 10wt%, hydrophilic SiO 2 The quality of ,: the quality of PVDF=1:100, the quality of DMF: the quality of acetone=1:1;

[0029] (2) Electrospinning is carried out with the solution obtained in step (1), and the electrospinning process parameters are adjusted. The first layer uses 20KV voltage, 0.8ml / h advancing rate, 14cm receiving distance, 400r / min, and the spinning time is 2h. The second layer uses 15KV voltage, 2ml / h propulsion rate, 9cm receiving distance, 300r / min, spinning time is 2h, the third layer uses 20KV voltage, 0.8ml / h propulsion rate, 14cm receiving distance, 400r / min, spinning The silk time is 2 hours, so that a thick and thin three-layer composite PVDF nano-membrane is formed;

[0030] (3) Add PVP and KH560 into deionized water and stir to form a hydrophilic fin...

Embodiment 2

[0037] (1) PVDF, hydrophilic SiO2 are dissolved in DMF and acetone and heated and stirred for 3h, then without heating and stirred for 19h, after fully stirring, the concentration of PVDF in the solution is 10wt%, hydrophilic SiO2, the quality: the quality of PVDF= 1:100, the quality of DMF, the quality of acetone = 1:1;

[0038] (2) Electrospinning is carried out with the solution obtained in step (1), and the electrospinning process parameters are adjusted. The first layer uses 20KV voltage, 0.8ml / h advancing rate, 14cm receiving distance, 400r / min, and the spinning time is 2h. The second layer uses 15KV voltage, 2ml / h propulsion rate, 9cm receiving distance, 300r / min, spinning time is 2h, the third layer uses 20KV voltage, 0.8ml / h propulsion rate, 14cm receiving distance, 400r / min, spinning The silk time is 2h, thus forming a three-layer composite PVDF nano-membrane;

[0039] (3) Add PVP and KH560 into deionized water and stir to form a hydrophilic finishing agent; wherein...

Embodiment 3

[0043] (1) PVDF, hydrophilic SiO2 are dissolved in DMF and acetone and heated and stirred for 4h, then without heating and stirred for 18h, after fully stirring, the concentration of PVDF in the solution is 10wt%, hydrophilic SiO2, the quality: the quality of PVDF= 1:100, the quality of DMF, the quality of acetone = 1:1;

[0044] (2) Electrospinning is carried out with the solution obtained in step (1), and the electrospinning process parameters are adjusted. The first layer uses 20KV voltage, 0.8ml / h advancing rate, 14cm receiving distance, 400r / min, and the spinning time is 2h. The second layer uses 15KV voltage, 2ml / h propulsion rate, 9cm receiving distance, 300r / min, spinning time is 2h, the third layer uses 20KV voltage, 0.8ml / h propulsion rate, 14cm receiving distance, 400r / min, spinning The silk time is 2h, thus forming a three-layer composite PVDF nano-membrane;

[0045] (3) Add PVP and KH560 into deionized water and stir to form a hydrophilic finishing agent; wherein...

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Abstract

The invention discloses a durable polyvinylidene fluoride three-layer composite hydrophilic film and a preparation method thereof. The preparation method comprises the following steps that (1), PVDF and hydrophilic SiO2 are dissolved in DMF and acetone, heating and stirring are carried out for 3-4 hours, and stirring is carried out for 18-20 hours without heating to obtain a PVDF solution; (2), electrostatic spinning is carried out on the PVDF solution obtained in the step (1), and electrostatic spinning process parameters are adjusted to prepare a three-layer composite PVDF nano film; (3), PVP and KH560 are added into deionized water according to a certain amount, and stirring is carried out to prepare a hydrophilic finishing agent; and (4), the three-layer composite PVDF nano-film is infiltrated in ethanol and placed in the hydrophilic finishing agent, and the three-layer composite PVDF nano-film is dried to obtain the durable polyvinylidene fluoride three-layer composite hydrophilic film. The obtained polyvinylidene fluoride film is excellent in hydrophilic effect, the water flux is not changed after multiple flux tests, and the durable polyvinylidene fluoride three-layer composite hydrophilic film 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 nanometer membrane. Specifically, it relates to a durable polyvinylidene fluoride three-layer composite hydrophilic membrane and a preparation method thereof. Background technique [0002] In recent years, nonwovens have developed rapidly, among which electrospun nanofiber membranes have attracted more and more attention, and have been applied in many fields with a very fast growth rate. The application of electrospun nanofiber membranes in current life is ubiquitous, such as mask production, air purifier filter elements, mask cloth, 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, and good acid and alkali resistance. However, since PVDF itself has no hydrophilic groups, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D01D5/00D01F6/12D04H1/4318D06M15/356D06M13/513D01F1/10D06M101/22
CPCD04H1/728D01D5/003D01F6/12D04H1/4318D06M15/3562D06M13/513D01F1/10D06M2101/22Y02A20/131
Inventor 冯建永许瑞祥李圣泉张凌霄王文富
Owner ZHEJIANG SCI-TECH UNIV
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