Preparation method of strongly-combined double-layer nanofiltration membrane

A nanofiltration membrane and double-layer technology is applied in the field of preparation of strong-bonded double-layered nanofiltration membranes, which can solve the problems of weak bonding force between the separation layer and the support layer, poor chlorine resistance of polyamide nanofiltration membranes, and shortened service life, etc. Achieving good development prospects, strong binding force and high water flux

Pending Publication Date: 2022-03-18
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the commercial polyamide composite membrane is prepared by interfacial polymerization, but the polyamide nanofiltration membrane prepared by this crosslinking reaction has poor chlorine resistance and weak bonding between the separation layer and the support layer, which is greatly restricted in the use process. , highly susceptible to environmental influences that reduce its service life

Method used

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  • Preparation method of strongly-combined double-layer nanofiltration membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a strongly combined double-layer nanofiltration membrane, the specific steps are as follows:

[0023] 1) Preparation of casting solution: Add 20g of polyethersulfone, 5g of carboxyl-terminated SMA and 5g of polyethylene glycol-800 into 70g of DMAC organic solution, heat to 70°C, and stir until homogeneous;

[0024] 2) Vacuum static defoaming: keep the above-mentioned casting liquid in a heated state to evacuate, stop stirring and carry out defoaming treatment;

[0025] 3) Preparation of the base film: prepare the base film from the casting solution by phase inversion method, place it in deionized water for use;

[0026] 4) Preparation of a single-layer nanofiltration membrane: prepare a polyglycerin solution with a mass fraction of 10%, pour the solution on the surface of the base membrane, and obtain a single-layer polyester composite nanofiltration membrane after crosslinking for 2 hours;

[0027] 5) Preparation of double-layer nanofiltration m...

Embodiment 2

[0029] A method for preparing a strongly combined double-layer nanofiltration membrane, the specific steps are as follows:

[0030] 1) Preparation of casting solution: Add 15g of polysulfone, 5g of carboxyl-terminated SMA and 3g of polyvinylpyrrolidone K30 into 77g of DMAC organic solution, heat to 70°C, and stir until homogeneous;

[0031] 2) Vacuum static defoaming: keep the above-mentioned casting liquid in a heated state to evacuate, stop stirring and carry out defoaming treatment;

[0032] 3) Preparation of the base film: prepare the base film from the casting solution by phase inversion method, place it in deionized water for use;

[0033] 4) Preparation of composite nanofiltration membrane: prepare a polyglycerin solution with a mass fraction of 0.5%, pour the solution on the surface of the basement membrane, and cross-link for 5 hours to obtain a single-layer composite nanofiltration membrane.

[0034] 5) Preparation of a double-layer nanofiltration membrane: Prepare ...

Embodiment 3

[0036] A method for preparing a strongly combined double-layer nanofiltration membrane, the specific steps are as follows:

[0037] 1) Preparation of casting solution: Add 20g of polyvinylidene fluoride, 5g of carboxyl-terminated SMA and 5g of polyvinylpyrrolidone into 70g of DMAC organic solution, heat to 80°C, and stir until homogeneous;

[0038] 2) Vacuum static defoaming: keep the above-mentioned casting liquid in a heated state to evacuate, stop stirring and carry out defoaming treatment;

[0039] 3) Preparation of the base film: prepare the base film from the casting solution by phase inversion method, place it in deionized water for use;

[0040] 4) Preparation of composite nanofiltration membrane: a polyglycerol solution with a mass fraction of 3% was prepared, poured the solution on the surface of the basement membrane, and crosslinked for 3 hours to obtain a composite nanofiltration membrane.

[0041] 5) Preparation of a double-layer nanofiltration membrane: Prepare...

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Abstract

The invention discloses a preparation method of a strong-binding double-layer nanofiltration membrane, which comprises the following steps: step 1, obtaining carboxyl-terminated SMA macromolecules, and then blending carboxylated SMA and a polymer membrane material into a homogeneous membrane casting solution; 2, preparing the membrane casting solution into a surface carboxylation ultrafiltration membrane material by using a phase inversion method; step 3, adding a polyhydroxy polymer on the surface of the surface carboxylated ultrafiltration membrane material, and performing esterification reaction on the polyhydroxy polymer and carboxyl to obtain a nanofiltration membrane with a single-layer structure; and 4, adding a linear diacyl chloride monomer on the surface of the nanofiltration membrane with the single-layer structure for secondary crosslinking to obtain the strong-binding double-layer nanofiltration membrane. The method has the characteristics that the operation is simple and convenient, and the prepared nanofiltration membrane is strong in bonding force between composite layers, excellent in separation performance and the like. Compared with a traditional interfacial polymerization method for preparing the polyamide nanofiltration membrane, the nanofiltration membrane with a double-layer separation structure on the surface can be obtained through secondary reaction. The product obtained according to the method has the characteristics of excellent permeability, good chlorine resistance and high pressure resistance.

Description

【Technical field】 [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of a strongly bonded double-layer nanofiltration membrane. 【Background technique】 [0002] In membrane separation technology, the separation membrane is the most basic and core part. According to the structural characteristics of the membrane and the size of the intercepted substance, the separation membrane can be mainly divided into microfiltration membrane, ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane. Among them, the effective separation pore size of the nanofiltration membrane is about 1nm, which is located between the reverse osmosis membrane and the ultrafiltration membrane. According to its unique structure and separation characteristics, the nanofiltration membrane separation technology has shown an excellent role in the purification of drinking water. It is an effective method for preparing high-quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/02B01D61/02
CPCB01D67/0011B01D67/0013B01D67/0006B01D69/125B01D69/02B01D61/027B01D2325/30
Inventor 张凯舟靳进波秦舒浩杨敬葵张敏敏姚勇李剑李科褡
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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