Preparation method of high-power interception reinforced nano-structure composite membrane

A nano-structure composite and high-power technology, applied in the field of membrane separation, can solve the problems that anti-pollution and hydrophilicity have not been effectively improved, increasing the difficulty of continuous production, increasing the number of multiple monomers and preparation steps, etc.

Inactive Publication Date: 2020-07-31
浙江迪萧科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation of nanocomposite membranes by interfacial polymerization not only requires a complex aqueous solution system, but even requires pretreatment of the aqueous phase or base membrane, and the performance of the prepared membrane still cannot avoid the gap between the rejection rate and the membrane flux. trade-off relationship
[0003] In recent years, with the continuous development of membrane preparation technology, the discovery of nanopolymer structure has made the interfacial polymerization method have greater application potential and further enhanced the interception effect of composite membranes. However, the formation of nanostructures in the polymerization process still needs to involve a variety of The increase of monomers and preparation steps greatly increases the difficulty of continuous production; at the same time, there is no significant advantage in the selective separation of divalent ions, and the anti-pollution and hydrophilicity have not been effectively improved.

Method used

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  • Preparation method of high-power interception reinforced nano-structure composite membrane
  • Preparation method of high-power interception reinforced nano-structure composite membrane
  • Preparation method of high-power interception reinforced nano-structure composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0026] A 30,000 molecular weight cut-off ultrafiltration membrane made of polyethersulfone material is selected as the base membrane, and a nanostructured composite membrane is prepared according to the steps described in claim 1:

[0027] (1) prepare the aqueous phase monomer solution, the sulfhydryl concentration in the aqueous phase is 0.50mol / L, the content of bispiperidine in the aqueous phase is 0.40%, and mix uniformly by magnetic stirring;

[0028] (2) preparing an organic phase monomer solution, the content of trimesoyl chloride (TMC) in the organic phase is 0.20%, and the solvent is n-hexane;

[0029] (3) Interfacial polymerization reaction, under the pressure of 0.1Mpa, impregnate the base film in the prepared water phase monomer solution for 4 minutes, pour out the water phase solution, remove the excess liquid on the surface, and then impregnate the base film in the Put in the prepared organic phase monomer solution for 60 seconds, pour out the organic phase solut...

Embodiment 4-8

[0033] The 30000 molecular weight cut-off ultrafiltration membrane made of polysulfone material is selected as the base membrane, and the nanostructure composite membrane is prepared according to the steps described in claim 1:

[0034] (1) prepare aqueous phase monomer solution, the bicarbonate concentration in the aqueous phase is 0.50mol / L, the content of the bispiperidine in the aqueous phase is successively 0.10%, 0.20%, 0.30%, 0.40%, 0.50%, Mix evenly by magnetic stirring;

[0035] (2) prepare organic phase monomer solution, trimesoyl chloride content is as shown in table 2 in the organic phase, and solvent is IsoparG;

[0036] (3) Interfacial polymerization reaction, under 0.1Mpa pressure, impregnate the base film in the prepared water phase monomer solution for 5 minutes, then pour out the water phase solution, remove the excess liquid on the surface, and then impregnate the base film in the prepared water phase monomer solution Put in the good organic phase monomer s...

Embodiment 9-13

[0040] The 30000 molecular weight cut-off ultrafiltration membrane made of polysulfone material is selected as the base membrane, and the nanostructure composite membrane is prepared according to the steps described in claim 1:

[0041] (1) prepare aqueous phase monomer solution, the carbonate group in the water phase and the sulfite group mixing concentration are respectively 0.10,0.20,0.30,0.40,0.50mol / L, the content of the bispiperidine in the water phase is 0.40%, Mix evenly by magnetic stirring;

[0042] (2) preparing an organic phase monomer solution, the content of trimesoyl chloride in the organic phase is 0.20%, and the solvent is n-hexane;

[0043] (3) Interfacial polymerization reaction, immerse the base film in the prepared aqueous phase monomer solution for 5 minutes, pour out the aqueous phase solution, remove excess liquid on the surface, and then impregnate the base film in the prepared organic phase monomer solution In the body solution for 120 seconds, the o...

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Abstract

The invention belongs to the technical field of membranes, and relates to a preparation method of a high-power interception reinforced nano-structure composite membrane. According to the preparation method, an aqueous phase buffer system of interfacial polymerization is changed; adding of one or a combination of more of hydrosulfide radical, sulfite radical, bisulfite radical, bicarbonate radicaland carbonate radical is carried out, enough nanometer bubbles are generated in interfacial polymerization process, the nanometer polymerization structure is enhanced, the membrane surface morphologyis changed, and the nano-structure composite membrane with super high interception rate on inorganic high valence ions is obtained, and at the same time, the water flux attenuation rate of the membrane is minimized, and the pollution resistance and the hydrophilicity are significantly improved. According to the preparation method provided by the invention, through simpler and more convenient operation steps, a high-performance and low-cost preparation process is realized under the condition that raw materials and parameter variables are greatly reduced, and the application range of the composite membrane is greatly widened.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a preparation method of a nanostructure composite membrane. Background technique [0002] As a very common composite membrane preparation process, the interfacial polymerization method can not only prepare a polymer layer with good performance by virtue of its relatively simple process steps and excellent polymerization degree, but also can add or change the water phase and The monomer in the oil phase can improve one or more performance parameters of the original composite membrane. The existing preparation of nanocomposite membranes by interfacial polymerization not only requires a complex aqueous solution system, but even requires pretreatment of the aqueous phase or base membrane, and the performance of the prepared membrane still cannot avoid the gap between the rejection rate and the membrane flux. trade-off relationship. [0003] In recent years, with the conti...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D69/12
CPCB01D69/125B01D71/82B01D2325/36
Inventor 于清丁武龙
Owner 浙江迪萧科技有限公司
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