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Anti-stripping composite PVDF ultrafiltration membrane

An ultrafiltration membrane and anti-stripping technology, which is applied in the field of ultrafiltration membranes, can solve the problems affecting the tensile strength, compressive strength, and low energy of polyvinylidene fluoride ultrafiltration composite membranes, and achieve improved peeling resistance, Effect of improving tensile and compressive strength

Pending Publication Date: 2021-05-18
徐州洁诚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A serious problem with existing PVDF ultrafiltration membranes is that during fabrication, due to the low energy required to break the bonds of fluorine-carbon functional groups between molecules, it will affect the polyvinylidene fluoride ultrafiltration composite membrane. tensile and compressive strength

Method used

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  • Anti-stripping composite PVDF ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation method is as follows:

[0032] 1S: Prefabrication first: In a stainless steel autoclave equipped with stirring, add dimethyl sulfoxide, deionized water and dispersant prepared in advance, seal the reaction kettle, vacuumize, fill with nitrogen to replace oxygen, stir, and heat up to 50°C;

[0033] 2S: Polyvinylidene fluoride polymerization: Add polyvinylidene fluoride monomer, raise the pressure of the kettle to 3.5MPa, keep the temperature in the kettle at 30°C, add oil-soluble initiator and chain transfer agent, and the polymerization reaction starts; continue Add polyvinylidene fluoride monomer and the corresponding proportion of oil-soluble initiator and chain transfer agent at a certain rate to maintain the temperature and pressure in the reactor; until the polyvinylidene fluoride monomer is added, the pressure drops from 3.5MPa to 2.8MPa, stop stirring, and the polymerization reaction is over;

[0034] 3S: Preparation of ultrafiltration membrane:...

Embodiment 2

[0039] The preparation method is as follows:

[0040] 1S: Prefabrication: In a stainless steel autoclave equipped with stirring, add the pre-prepared dimethyl sulfoxide, deionized water and dispersant, seal the reaction kettle, evacuate, and replace the oxygen with nitrogen, then stir and heat up. to 50°C;

[0041] 2S: Polymerization of polyvinylidene fluoride: add polyvinylidene fluoride monomer, raise the pressure of the autoclave to 3.5MPa, keep the temperature in the autoclave at 30°C, add oil-soluble initiator and chain transfer agent, the polymerization reaction starts; continue; Add polyvinylidene fluoride monomer and corresponding proportion of oil-soluble initiator and chain transfer agent at a certain rate to maintain the temperature and pressure in the reactor; until the polyvinylidene fluoride monomer is added, the pressure drops from 3.5MPa to 2.8MPa, stop stirring, and the polymerization reaction ends;

[0042] 3S: Preparation of ultrafiltration membrane: centr...

Embodiment 3

[0047] The preparation method is as follows:

[0048] 1S: Prefabrication: In a stainless steel autoclave equipped with stirring, add the pre-prepared dimethyl sulfoxide, deionized water and dispersant, seal the reaction kettle, evacuate, and replace the oxygen with nitrogen, then stir and heat up. to 50°C;

[0049] 2S: Polymerization of polyvinylidene fluoride: add polyvinylidene fluoride monomer, raise the pressure of the autoclave to 3.5MPa, keep the temperature in the autoclave at 30°C, add oil-soluble initiator and chain transfer agent, the polymerization reaction starts; continue; Add polyvinylidene fluoride monomer and corresponding proportion of oil-soluble initiator and chain transfer agent at a certain rate to maintain the temperature and pressure in the reactor; until the polyvinylidene fluoride monomer is added, the pressure drops from 3.5MPa to 2.8MPa, stop stirring, and the polymerization reaction ends;

[0050] 3S: Preparation of ultrafiltration membrane: centr...

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Abstract

The invention discloses an anti-stripping composite PVDF ultrafiltration membrane. The required materials are as follows: a polyvinylidene fluoride monomer; dimethyl sulfoxide; a dispersant; an oil soluble initiator; a chain transfer agent and deionized water. According to the preparation method, a quaternary ammonium base alcohol solution, a styrene solution and a dichloromethane solution are added during polymerization of polyvinylidene fluoride, so that a polymer of the polyvinylidene fluoride is modified, the oxidation resistance of the polyvinylidene fluoride is improved, and meanwhile, the fluorine-carbon bond energy in the polyvinylidene fluoride is also improved, further, the tensile strength and compressive strength of the polyvinylidene fluoride ultrafiltration composite membrane are greatly improved, so that the stripping resistance of the polyvinylidene fluoride ultrafiltration membrane is improved.

Description

technical field [0001] The invention relates to the technical field of ultrafiltration membranes, in particular to an anti-stripping composite PVDF ultrafiltration membrane. Background technique [0002] PVDF membrane, namely polyvinylidene fluoride membrane (polyvinylidene fluoride) is a solid phase support commonly used in Western blotting, and the key to ultrafiltration technology is the membrane. There are various types and specifications of the membrane, which can be selected according to the needs of the work. The early membranes were isotropic uniform membranes, that is, the commonly used microporous membranes, whose pore diameters are usually 0.05mm and 0.025mm. In recent years, some anisotropic asymmetric ultrafiltration membranes have been produced. One of the anisotropic diffusion membranes is composed of a very thin porous "skin layer" with a certain pore size (thickness is about 0.1mm ~ 1.0mm) , and a relatively thicker (about 1mm) more permeable "sponge layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D71/34B01D69/02
CPCB01D61/145B01D69/02B01D71/34B01D2325/24
Inventor 韩丰锴韩祥瑞韩祥军
Owner 徐州洁诚环保科技有限公司