Method for preparing hydrophilic polyvinyl chloride alloy ultrafiltration membrane

A polyvinyl chloride, hydrophilic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the inevitable damage to membrane structure and strength, poor thermal and chemical stability of PVC, difficult Realize problems such as industrialized production, and achieve the effects of controllable and stable structure, strong hydrophilicity and anti-pollution, and repeatability.

Inactive Publication Date: 2008-10-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although surface grafting can effectively improve the surface properties of the membrane and has long-term stability, due to the poor thermal and chemical stability

Method used

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  • Method for preparing hydrophilic polyvinyl chloride alloy ultrafiltration membrane
  • Method for preparing hydrophilic polyvinyl chloride alloy ultrafiltration membrane
  • Method for preparing hydrophilic polyvinyl chloride alloy ultrafiltration membrane

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Effect test

preparation example Construction

[0036] The preparation method of hydrophilic polyvinyl chloride alloy ultrafiltration membrane comprises the following steps:

[0037] 1) Synthesis of amphiphilic graft copolymer: 15g polyvinyl chloride is dissolved in 150ml nitrogen methyl pyrrolidone, add 75ml hydrophilic monomer polyethylene glycol monomethyl ether methacrylate (PEGMA) (molecular weight is 475g / mol), 0.12g cuprous bromide, 0.048g cupric bromide, 0.39g pentamethyldiethylenetriamine, stirred evenly, moved to 95°C oil bath, protected by high-purity argon, and carried out atom transfer radical polymerization , reacted for 3 hours, then precipitated with a mixture of methanol and water, the volume ratio of methanol and water was 3:7, to obtain amphiphilic graft copolymer polyvinyl chloride-g-polyethylene glycol monomethyl ether methyl Acrylate (PVC-g-PEGMA).

[0038] 2) Preparation of casting solution: 10-30wt% of polyvinyl chloride, 1-10wt% of amphiphilic graft copolymer, 5.5-26wt% of additives, 0.1-2wt% of no...

Embodiment 1

[0045] Embodiment 1 preparation steps are as follows:

[0046] 1) Synthesis of amphiphilic graft copolymer: 15g polyvinyl chloride is dissolved in 150ml nitrogen methyl pyrrolidone, add 75ml hydrophilic monomer polyethylene glycol monomethyl ether methacrylate (PEGMA) (molecular weight is 475g / mol), 0.12g cuprous bromide, 0.048g cupric bromide, 0.39g pentamethyldiethylenetriamine, stirred evenly, moved to 95°C oil bath, protected by high-purity argon, and carried out atom transfer radical polymerization , reacted for 3 hours, then precipitated with a mixture of methanol and water, the volume ratio of methanol and water was 3:7, to obtain amphiphilic graft copolymer polyvinyl chloride-g-polyethylene glycol monomethyl ether methyl Acrylate (PVC-g-PEGMA).

[0047] 2) Preparation of casting solution: 10wt% of polyvinyl chloride, 1wt% of amphiphilic graft copolymer, 0.5wt% of additive polyvinylpyrrolidone; 5wt% of polyethylene glycol; 0.1wt% of non-solvent are blended with solvent...

Embodiment 2

[0053] Embodiment 2 preparation steps are the same as embodiment 1.

[0054]

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Abstract

The present invention discloses a preparation method of hydrophilic PVC alloy ultrafiltration membrane. PVC amphiphilic graft copolymer is synthesized through an atom-transfer-free radical polymerization method, which is taken as a hydrophilic modifier and is blended with PVC to prepare the PVC alloy ultrafiltration membrane with controllable structure, hydrophilicity, pollution resistance, large flux and high rejection rate by a solution transformation method. The hydrophilic chain of the amphiphilic graft copolymer can self-assemble and transfer to the membrane surface for microphase separation in the process of solution phase inversion, thus forming a relatively thin hydrophilic surface layer (dozens to hundreds of nanometers). The membrane preparation and hydrophilic modification are carried out simultaneously and the hydrophilic modification of membrane and the interior of the membrane hole can be achieved. The surface contact angle of the ultrafiltration membrane is less than 60 degrees and can be reduced to 0 degree within dozens of seconds; the water flux reaches above 500L/m<2> h(0.1Mpa); the BSA rejection rate reaches above 90 percent; the recovery rate of water cleaning flux is above 90 percent.

Description

technical field [0001] The invention belongs to the technical field of preparation and modification of polyvinyl chloride (PVC) separation membranes, in particular to a method for preparing a hydrophilic polyvinyl chloride alloy ultrafiltration membrane, that is, by co-polymerizing an amphiphilic graft copolymer with polyvinyl chloride Mixing, the purpose of hydrophilic modification can be realized simultaneously during the process of solution phase inversion and membrane formation. Background technique [0002] In the field of polymer membrane separation materials, polyvinyl chloride (PVC) has excellent acid and alkali resistance, bacteria resistance, and weather resistance, especially its low price, making it in the field of microfiltration and ultrafiltration at room temperature. Expensive polyvinylidene fluoride (PVDF), polyethersulfone (PES), etc. have unique advantages, and there is a huge application market. However, its gel membrane is easy to wrinkle spontaneously,...

Claims

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Application Information

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IPC IPC(8): B01D71/30
Inventor 徐又一王建宇刘富朱宝库朱利平
Owner ZHEJIANG UNIV
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