Modification method of porous membrane, modified porous membrane and application of modified porous membrane

A porous membrane and modification technology, which is applied in the field of porous membrane modification and modified porous membrane, can solve the problems that the pore size of semi-permeable membrane cannot be adjusted, the degree of pore adjustment is different, and it is difficult to control the uniform level.

Active Publication Date: 2021-06-22
ASIA REGENERATIVE MEDICINE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pore size of semipermeable membranes prepared by biaxial stretching, particle filtration, phase separation, and electrostatic methods cannot be adjusted once they are formed.
In order to solve the above problems, researchers have tried to introduce modification

Method used

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  • Modification method of porous membrane, modified porous membrane and application of modified porous membrane
  • Modification method of porous membrane, modified porous membrane and application of modified porous membrane
  • Modification method of porous membrane, modified porous membrane and application of modified porous membrane

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Embodiment 1

[0046] This embodiment provides a modified porous membrane and a method for modifying the porous membrane.

[0047] The raw material reagents used in the modification process of the porous membrane are as follows:

[0048] Porous membrane: a disc-shaped expanded polytetrafluoroethylene semipermeable membrane (ePTFE membrane) with a thickness of 100 μm, a porosity of 85%, a pore diameter of 220 nm, and a diameter of 3 cm.

[0049] Pre-polymerization solution: Take 10g of acrylic acid monomer, 1g of N,N'-methylenebisacrylamide crosslinking agent, and 1g of potassium persulfate initiator to prepare 100ml of aqueous solution.

[0050] The steps of the modification method of expanded polytetrafluoroethylene semipermeable membrane are as follows:

[0051] S0, fixing the expanded polytetrafluoroethylene semipermeable membrane in a mold composed of a glass sheet and a silica gel sheet, sequentially adding anhydrous ether for soaking treatment for 1 hour, then adding 50 wt% ether aque...

Embodiment 2

[0057] This embodiment provides a modified porous membrane and a method for modifying the porous membrane.

[0058] The raw material reagents used in the modification process of the porous membrane are as follows:

[0059] Porous membrane: a disc-shaped expanded polytetrafluoroethylene semipermeable membrane with a thickness of 30 μm, a porosity of 75%, a pore diameter of 450 nm, and a diameter of 3 cm.

[0060] Prepolymerization liquid: take 20g of acrylamide monomer, 2g of N,N'-methylenebisacrylamide crosslinking agent, and 2g of azobisisobutylcyanide initiator to prepare 100ml of aqueous solution.

[0061] The steps of the modification method of expanded polytetrafluoroethylene semipermeable membrane are as follows:

[0062] S0. Fix the expanded polytetrafluoroethylene semi-permeable membrane in a mold composed of a glass sheet and a silica gel sheet, sequentially add anhydrous methanol for soaking treatment for 0.5h, then add 50wt% methanol aqueous solution for sufficient...

Embodiment 3

[0068] This embodiment provides a modified porous membrane and a method for modifying the porous membrane.

[0069] The raw material reagents used in the modification process of the porous membrane are as follows:

[0070] Porous membrane: a disc-shaped expanded polytetrafluoroethylene semipermeable membrane with a thickness of 60 μm, a porosity of 80%, a pore diameter of 1000 nm, and a diameter of 3 cm.

[0071] Pre-polymerization liquid: take 15g 2-acrylamide-2-methylpropanesulfonic acid monomer, 2g N,N'-methylenebisacrylamide crosslinking agent, 2g azobisisobutylcyanide initiator to make 100ml aqueous solution .

[0072] The steps of the modification method of expanded polytetrafluoroethylene semipermeable membrane are as follows:

[0073] S0. Fix the expanded polytetrafluoroethylene semipermeable membrane in a mold composed of a glass sheet and a silica gel sheet, sequentially add anhydrous acetone for soaking treatment for 0.5h, then add 50wt% acetone aqueous solution f...

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Abstract

The invention discloses a modification method of a porous membrane, a modified porous membrane and an application of the modified porous membrane. The modification method comprises the following steps: S1, placing a porous membrane in a pre-polymerization solution containing a monomer, and initiating a polymerization reaction through free radicals to pre-polymerize the monomer in the pre-polymerization solution on the porous membrane; and S2, removing the pre-polymerized solution, and continuing free radical-initiated polymerization reaction. According to the two-step method, firstly, the porous membrane is placed in the pre-polymerization solution to be directly prepolymerized, so that monomers in the porous membrane can be at least partially polymerized, and in the process, the provided surrounding environment of the prepolymerization liquid can enable the content of the prepolymerization liquid at different positions in porous channels of the porous membrane to be in a more full-load state; therefore, the local structure of the pore channel is more uniform; and then the porous membrane is separated from the prepolymerization solution, and the prepolymerization components in the porous membrane are further polymerized, so that the dispersion degree of the adjusted pore sizes at different positions in the porous membrane is effectively ensured to be reduced to the minimum.

Description

technical field [0001] This application relates to the technical field of biomedical materials, especially the modification method of porous membrane, modified porous membrane and its application. Background technique [0002] Semipermeable membrane is a kind of porous film, which can effectively intercept macromolecules and filter small molecular components, and has a wide range of applications in biopharmaceuticals, biomedical engineering, ecological environment treatment, and catering. The materials used in conventional polymer semipermeable membranes include polypropylene (PP), polyethersulfone resin (PES), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyamide (PA), mixed cellulose (MCE), etc. These semi-permeable membranes are hydrophobic filtration membranes, which cannot be directly used in the fields of aqueous phase separation and filtration, and need to be appropriately modified by hydrophilicity. Plasma treatment, irradiation, chemical graftin...

Claims

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Application Information

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IPC IPC(8): C08J7/16C08J9/40C08L27/18
CPCC08J7/16C08J9/405C08J2327/18
Inventor 吴水平张磊周文浩吴海伟郑立新
Owner ASIA REGENERATIVE MEDICINE LTD
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