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Preparation method of modified ultrafiltration membrane by layer-by-layer self-assembly technology

A layer-by-layer self-assembly, ultrafiltration membrane technology, applied in the field of membrane separation, can solve the problems of poor hydrophilicity and antifouling properties of ultrafiltration membranes, complex processes, etc., and achieve the effect of strong practicability and simple process

Pending Publication Date: 2020-02-04
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor hydrophilicity and anti-fouling properties and complicated process of the ultrafiltration membrane prepared by the existing method, the present invention provides a preparation method of the ultrafiltration membrane modified by layer-by-layer self-assembly technology

Method used

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  • Preparation method of modified ultrafiltration membrane by layer-by-layer self-assembly technology
  • Preparation method of modified ultrafiltration membrane by layer-by-layer self-assembly technology
  • Preparation method of modified ultrafiltration membrane by layer-by-layer self-assembly technology

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Embodiment 1

[0023] This embodiment provides a method for preparing a modified ultrafiltration membrane layer by layer self-assembly technology, such as figure 1 As shown, the method includes the following steps:

[0024] Step 1: Preparation of tertiary amino polysulfone polymer: (1) Under the protection of nitrogen, 3.08g bisphenol A, 0.52g 2,2-dimethylaminomethylene-4,4-bisphenol A, 3.71 g 4,4'-difluorodiphenylsulfone and 5g potassium carbonate were added to 100ml dimethyl sulfoxide solution for copolymerization, 50ml toluene was added as a water-carrying agent, and reacted at 180℃ for 12h; (2) After the reaction, the mixed system Pour into deionized water to precipitate; (3) Wash with distilled water, filter, and vacuum dry at 220°C for 12 h.

[0025] Step 2. Preparation of zwitterionic polysulfone polymer: (1) Dissolve 332 mg of methacryl ethyl sulfobetaine (SBMA) and 4.6 g of tertiary amino polysulfone polymer in a mixture of chloroform, 80 The reaction was heated and stirred at ℃ for 18h...

Embodiment 2

[0033] This embodiment provides a method for preparing a layer-by-layer self-assembly technology modified ultrafiltration membrane. The method includes the following steps:

[0034] Step 1: Preparation of tertiary amino polysulfone polymer: (1) Under the protection of nitrogen, 3.86g bisphenol A, 0.41g 2,2-dimethylaminomethylene-4,4-bisphenol A, 3.92g 4,4'-difluorodiphenylsulfone and 6g potassium carbonate were added to 150ml dimethyl sulfoxide solution for copolymerization, 80ml toluene was added as a water-carrying agent, and reacted at 200℃ for 18h; (2) After the completion of the mixed system Pour into deionized water to precipitate; (3) Wash with distilled water and dry in vacuum at 250°C for 12 hours.

[0035] Step 2. Preparation of zwitterionic polysulfone polymer: (1) Dissolve 364 mg of methacryl ethyl sulfobetaine (SBMA) and 5.2 g of tertiary amino polysulfone polymer in a chloroform mixture, 60 The reaction was heated and stirred at ℃ for 24h; (2) After the reaction was ...

Embodiment 3

[0042] This embodiment provides a method for preparing a layer-by-layer self-assembly technology modified ultrafiltration membrane. The method includes the following steps:

[0043] Step 1: Preparation of tertiary amino polysulfone polymer: (1) Under the protection of nitrogen, mix 4.02g bisphenol A, 0.66g 2,2-dimethylaminomethylene-4,4-bisphenol A, 4.3g 4,4'-difluorodiphenyl sulfone and 8g potassium carbonate were added to 180ml dimethyl sulfoxide solution for copolymerization, 90ml toluene was added as a water-carrying agent, and reacted at 220℃ for 22h; (2) After the completion of the mixed system Pour into deionized water to precipitate; (3) Wash with distilled water and dry in vacuum at 250°C for 12 hours.

[0044] Step 2. Preparation of zwitterionic polysulfone polymer: (dissolve) 283 mg of methacryl ethyl sulfobetaine (SBMA) and 5.5 g of tertiary amino polysulfone polymer in a mixture of chloroform at 80°C Under heating and stirring reaction for 24h; (2) After the reaction ...

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Abstract

The invention discloses a preparation method of a modified ultrafiltration membrane by a layer-by-layer self-assembly technology. The method comprises the following steps: step 1, preparing a tertiaryamine polysulfone polymer: preparing a tertiary amine polysulfone copolymer by a condensation polymerization method; step 2, preparing a zwitterionic polysulfone polymer: preparing the zwitterionic polysulfone polymer by a condensation polymerization method; step 3, dissolving the zwitterionic polysulfone polymer prepared in the step 2 in a mixed solution of dimethylacetamide and ethanol to prepare a zwitterionic polysulfone polymer solution; step 4, immersing a polysulfone base membrane into the zwitterionic polysulfone polymer solution, taking out the polysulfone base membrane, and cleaningthe polysulfone base membrane with deionized water to obtain a polysulfone base membrane containing a zwitterionic polysulfone layer; and step 5, repeating the step 4 for 3-7 times. The zwitterionicpolysulfone polymer is self-assembled on the surface of the polysulfone base membrane by using the layer-by-layer self-assembly technology so as to modify the base membrane, and an assembly layer is relatively thin, so that relatively large flux and relatively good interception performance can be obtained.

Description

Technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a method for modifying a membrane, in particular to a method for preparing a layer-by-layer self-assembly technology modified ultrafiltration membrane. Background technique [0002] Membrane separation technology has the characteristics of good selectivity, energy saving, high efficiency, and easy integration. It is widely used in water treatment, chemical engineering, food, medical treatment, environment and other fields, and has produced huge social and economic benefits. Ultrafiltration membrane is a pressure-driven membrane between microfiltration membrane and nanofiltration membrane. Because of its lower operating pressure (0.1~0.5 MPa) and larger permeation flux (100~500 L / m 2 hbar) and a wider molecular cut-off interval (1000~200000 Da) are widely used. [0003] The key to the lack of competitiveness of domestic ultra-microfiltration membranes lies in their low flux and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D67/00B01D71/68
CPCB01D61/145B01D67/0006B01D71/68B01D2325/36
Inventor 李大龙高昌录孙秀花张瑛洁
Owner HARBIN INST OF TECH AT WEIHAI
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