Polyvinylidene fluoride based micro-pore film and preparation method thereof

A technology of polyvinylidene fluoride and microporous membrane, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of complicated process and insufficient hydrophobicity of microporous membrane, and achieve good air permeability, small pore size, and high filtration efficiency. high precision effect

Inactive Publication Date: 2016-08-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] What the present invention is to solve is the problem of insufficient hydrophobicity and complex process of existing microporous membranes

Method used

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  • Polyvinylidene fluoride based micro-pore film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of polyvinylidene fluoride-based microporous membrane:

[0032] In the first step, the two polymers of PVDF (Shanghai Sanaifu New Material Co., Ltd., brand FR907) and water-soluble polyester size (produced by Shandong Juye Fine Chemical Co., Ltd.) were mixed at a ratio of 10:1 at 50 Dissolve in DMAC / PVP mixed solution at ℃, the ratio of the two solvents is 1:1, and the weight percent concentration of the polymer is 15%;

[0033] In the second step, in the above-mentioned polymer solution, isopropanol is added according to the ratio of 1:5 to the mixed solvent, stirred evenly, left to stand for defoaming, and a film-forming liquid is obtained;

[0034] In the third step, the thickness is 0.03mm, the surface density is 5g / m 2 The spunbonded polyester nonwoven fabric is dipped into the above-mentioned film-forming liquid, pulled out from the roll, and stayed in the air for 20s, then entered the water bath, stayed for 15min, and became a primary microp...

Embodiment 2

[0039] A preparation method of polyvinylidene fluoride-based microporous membrane:

[0040] In the first step, PVDF (Shanghai Sanaifu New Material Co., Ltd., brand FR907) and PVA (produced by Sinopec Sichuan Vinylon Plant, alcoholysis degree 99%, polymerization degree 1700) were mixed in the ratio of 5:1. Dissolved in the DMF / PVP mixed solution at 70°C, the ratio of the two solvents is 2:1, and the weight percent concentration of the polymer is 8%;

[0041] In the second step, in the above polymer solution, acetone is added in a ratio of 1:8 to the mixed solvent, stirred evenly, and left to defoam to obtain a film-forming liquid;

[0042] In the third step, the thickness is 0.4mm, the surface density is 10g / m 2 The polypropylene melt-blown nonwoven fabric is dipped into the above-mentioned film-forming liquid, pulled out from the roll, and stayed in the air for 60s, then entered the water bath, stayed for 20min, and became a primary microporous film;

[0043] The fourth step...

Embodiment 3

[0047] A preparation method of polyvinylidene fluoride-based microporous membrane:

[0048] In the first step, PVDF (Shanghai Sanaifu New Material Co., Ltd., brand FR907) and PVA (produced by Sinopec Sichuan Vinylon Factory, alcoholysis degree 99%, polymerization degree 1700) were mixed according to the ratio of 8:1 in the Dissolved in DMSO / PVP mixed solution at 60°C, the ratio of the two solvents is 2:1, and the weight percent concentration of the polymer is 10%;

[0049] In the second step, in the above polymer solution, add acetic acid according to the ratio of 1:6 to the mixed solvent, stir evenly and leave to defoam to obtain a film-forming liquid;

[0050] In the third step, the thickness is 0.2mm, the surface density is 10g / m 2 The spunbonded polyester nonwoven fabric is dipped into the above-mentioned film-forming solution, pulled out from the roll, and stayed in the air for 40s, then entered the water bath, stayed for 30min, and became a primary microporous membrane;...

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Abstract

The invention discloses a polyvinylidene fluoride (PVDF) based micro-pore film and a preparation method thereof. The polyvinylidene fluoride based micro-pore film comprises a polyvinylidene fluoride micro-pore film provided with a supporting layer in the middle and a low-surface-energy substance coating on the surface of the polyvinylidene fluoride micro-pore film. The preparation method comprises the following steps: selecting two types of polymers, wherein one is polyvinylidene fluoride; dissolving the two polymers into a solvent system to prepare a polymer solution; adding a pore-forming agent into the polymer solution; after uniformly stirring, standing and de-foaming to obtain a film-forming solution; immersing the supporting layer into the film-forming solution to obtain a primary micro-pore film; dissolving and etching the other polymer from the primary micro-pore film to obtain a primary PVDF based micro-pore film; immersing the primary PVDF based micro-pore film into a finishing solution containing the low-surface-energy substance and drawing out from a roller to obtain the PVDF based micro-pore. The film-forming solution is prepared by selecting two types of the incompatible polymers and the surface of the porous film is coated with the low-surface-energy substance, so that a microcosmic rough structure is formed on the surface of the micro-pore film and the super-hydrophobic effect is achieved.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride-based microporous membrane and a preparation method thereof, belonging to the technical field of membranes. Background technique [0002] Coating hydrophobic polymer coatings on the surface of solid materials can protect the solid surface to a certain extent, but coatings often do not have multiple properties to prevent damage caused by various reasons, and cannot achieve the purpose of multiple protection. Super-hydrophobic functional materials have attracted more and more attention in recent years, and can be widely used as surface coatings for outdoor antennas, ocean-going ships, and oil pipelines to provide better protection. [0003] Generally speaking, a surface with superhydrophobic properties needs to meet two conditions: one is to have a low surface energy; the other is to have a certain rough structure on the surface. Commonly used low surface energy substances mainly refer to fluorine-conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D67/00
CPCB01D67/0002B01D69/12B01D71/34B01D2325/38
Inventor 王洪靳向煜吴海波刘嘉炜
Owner DONGHUA UNIV
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