Method for preparing amphiphilic block copolymer modified polyvinylidene fluoride hollow fiber membrane

A polyvinylidene fluoride and copolymer modification technology, applied in the field of material science, can solve problems such as adsorption, achieve high filtration accuracy, improve hydrophilic properties, and increase strength

Active Publication Date: 2013-04-24
苏州富淼膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a polyvinylidene fluoride hollow fiber membrane with excellent hydrophilic properties, so as to overcome the problem that pollutants are easily adsorbed on the surface of the membrane and in the pores of the membrane

Method used

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  • Method for preparing amphiphilic block copolymer modified polyvinylidene fluoride hollow fiber membrane
  • Method for preparing amphiphilic block copolymer modified polyvinylidene fluoride hollow fiber membrane
  • Method for preparing amphiphilic block copolymer modified polyvinylidene fluoride hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Preparation of polyvinylpyrrolidone homopolymer:

[0043] Dissolve 2 parts of N-vinylpyrrolidone in 98 parts of 1,4-dioxane to make a 2% N-vinylpyrrolidone solution, and add 0.2 parts of S, S'-bis(α,α' -Methyl-α"acetic acid) trithiocarbonate, with 0.1 part of AIBN in N 2 Under protection, react at 60° C. for 4 hours to obtain a PVP homopolymer with a chain transfer agent terminal carboxyl group.

[0044] (2) Modification of polyvinylpyrrolidone homopolymer:

[0045] Dissolve 1 part of PVP homopolymer in 19 parts of dichloromethane to make a solution with a concentration of 5%, then add 2 parts of DCC and 8 parts of HOBT (based on PVP), then add 10 parts of Allylamine (based on PVP) was reacted at 0°C for 72 hours, and modified PVP was obtained after separation and treatment on a silica gel column.

[0046] (3) Modified PVP and organosiloxane polymer to generate block copolymer:

[0047] Dissolve 4 parts of modified PVP and 6 parts of vinyl polydimethylsiloxane i...

Embodiment 2

[0049] (1) Preparation of polyvinylpyrrolidone homopolymer:

[0050] Dissolve 100 parts of N-vinylpyrrolidone in 900 parts of 1,4-dioxane to make a 10% N-vinylpyrrolidone solution, and put 10 parts of S, S'-bis(α,α' -Methyl-α"acetic acid) trithiocarbonate, with 0.5 parts AIBN in N 2 Under protection, react at 80°C for 72 hours to obtain a PVP homopolymer with a chain transfer agent terminal carboxyl group.

[0051] (2) Modification of polyvinylpyrrolidone homopolymer:

[0052] Dissolve 1 part of PVP homopolymer in 1 part of dichloromethane to make a solution with a concentration of 50%, then add 8 parts of DCC and 4 parts of HOBT (based on PVP), and then add 50 parts of Allylamine (based on PVP) was reacted at 80° C. for 1 hour, and modified PVP was obtained after separation and treatment by silica gel column.

[0053] (3) Modified PVP and organosiloxane polymer to generate block copolymer:

[0054] Dissolve 3 parts of modified PVP and 7 parts of vinyl polydimethylsiloxane...

Embodiment 3

[0056] (1) Preparation of polyvinylpyrrolidone homopolymer:

[0057] Dissolve 30 parts of N-vinylpyrrolidone in 20 parts of 1,4-dioxane to make a 60% N-vinylpyrrolidone solution, and add 0.3 parts of S, S'-bis(α,α' -Methyl-α"acetic acid) trithiocarbonate, with 4.5 parts AIBN in N 2 Under protection, react at 60° C. for 72 hours to obtain a PVP homopolymer with a chain transfer agent terminal carboxyl group.

[0058] (2) Modification of polyvinylpyrrolidone homopolymer:

[0059] Dissolve 1 part of PVP homopolymer in 4 parts of dichloromethane to make a solution with a concentration of 20%, then add 4 parts of DCC and 4 parts of HOBT (based on PVP), and then add 40 parts of Styrylamine (based on PVP) was reacted at 25°C for 24 hours, and modified PVP was obtained after separation and treatment by silica gel column.

[0060] (3) Modified PVP and organosiloxane polymer to generate block copolymer:

[0061] Dissolve 6 parts of modified PVP and 4 parts of styrene-based polydimet...

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Abstract

The invention provides a method for preparing an amphiphilic block copolymer modified polyvinylidene fluoride hollow fiber membrane, which is characterized by comprising the following specific steps: blending polyvinylidene fluoride, a composite diluent and an amphiphilic block copolymer to prepare film casting liquid; extruding the film casting liquid by a spinning nozzle to form nascent hollow fibers; enabling the formed nascent hollow fibers to enter coagulating bath to carry out coagulation regeneration; placing the obtained hollow fiber membrane into an extraction agent to extract out the diluent; and then placing the obtained product into pure water to soak and wash and processing the obtained product by a pore maintaining agent to obtain the amphiphilic block copolymer modified polyvinylidene fluoride hollow fiber membrane finished product. The method fulfills the aim of hydrophilic modification by blending the amphiphilic polymer so as to finally improve the antifouling property of the membrane.

Description

technical field [0001] The invention relates to a preparation method of an amphiphilic block copolymer modified polyvinylidene fluoride hollow fiber membrane, belonging to the field of material science. Background technique [0002] As a new type of membrane material, polyvinylidene fluoride (PVDF) has excellent chemical stability, thermal stability, ultraviolet radiation resistance and sufficient mechanical strength, and has been widely used in membrane water resource utilization technology. Polyvinylidene fluoride hollow fiber membrane has the characteristics of no energy consumption, green environmental protection, high filtration accuracy, can filter out all bacteria, viruses, rust and other substances, and can retain the trace elements necessary for human body. In recent years, it has been widely used in microfiltration, ultrafiltration, membrane distillation, gas separation, seawater desalination, etc. However, most of the currently commercialized polyvinylidene fluor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/34B01D67/00C08F299/08C08F126/10C08F2/38C08F8/32
Inventor 何春菊李松涛
Owner 苏州富淼膜科技有限公司
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