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Hydrophilic polyvinyl chloride alloy ultrafiltration membrane and production method thereof

A polyvinyl chloride and ultrafiltration membrane technology, applied in the field of membrane separation, can solve the problems of decreased separation performance, loss of hydrophilicity, unstable structure, etc., to achieve improved hydrophilicity, increased surface self-assembly, and energy saving Effect

Active Publication Date: 2008-06-11
HAINAN LITREE PURIFYING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the difference in thermodynamic compatibility between the two components, the kinetic parameters during the film formation process can be adjusted to achieve the purpose of controlling the structural performance of the film. For film materials with poor thermodynamic compatibility, the structure is unstable during use, which is easy to cause With the loss of components, the hydrophilicity will also be lost, and the separation performance of the membrane will decrease.

Method used

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  • Hydrophilic polyvinyl chloride alloy ultrafiltration membrane and production method thereof
  • Hydrophilic polyvinyl chloride alloy ultrafiltration membrane and production method thereof
  • Hydrophilic polyvinyl chloride alloy ultrafiltration membrane and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Polyvinyl chloride / poly(vinyl chloride-vinyl acetate) / PVP / H with a weight ratio of 10 / 2 / 5 / 0.5 / 82.5 2 O / DMAc was fully stirred in the flask at 70°C for 24 hours until the polymer was completely dissolved and a uniform and transparent solution was obtained. The above-mentioned casting solution was filtered with a Buchner funnel, then subjected to vacuum degassing, and left to stand for use. After the casting solution is sprayed from the spinneret of the spinning machine, it stays in the air at room temperature with a humidity of 80% for 10 seconds, and then immersed in a pure water coagulation bath at 60°C at a constant speed, and the film after gel solidification is taken out and immersed in 30°C NaOH solution for 24h, followed by deionized cleaning at 40°C for 10h, and finally air-dried to obtain a hydrophilized PVC alloy ultrafiltration membrane.

[0048]

[0049] The contact angle, porosity, water flux and BSA rejection rate of the prepared PVC alloy ultrafiltrati...

Embodiment 2

[0051] The preparation steps are the same as in Example 1.

[0052]

Embodiment 3

[0054] The preparation steps are the same as in Example 1.

[0055]

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Abstract

The invention relates to a surface self-assembly hydrophilised modified method for a polychloroethylene ally hyperfiltration membrane, which comprises first, dissolving polychloroethylene, a second component of amphipathic nature polybasic multipolymer and pore-foaming agent in organic solvent, and forming casting solution, second, immersing the casting solution into the coagulating bath after being hollow-shaped, shaping films by gel through a method for converting wetness and humidity, regulating the separating time for the hydrophilous nature chain segment to be transferred to the surface and self-assemble, third, hydrophilised-processing polychloroethylene ally hyperfiltration membrane after being hardened by gel, fourth, cleaning the hyperfiltration membrane after being processed, and obtaining the polychloroethylene ally hyperfiltration membrane after dried.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a method for preparing a hydrophilic polyvinyl chloride alloy ultrafiltration membrane by blending polyvinyl chloride and a second-component amphiphilic multi-polymer copolymer and utilizing the principle of immersion precipitation phase inversion . Background technique [0002] Polyvinyl chloride (PVC) is one of the three largest synthetic resins with abundant sources, low price, good chemical stability, bacteria resistance, acid and alkali resistance, and chemical corrosion resistance. It is widely used in ultrafiltration membranes and microfiltration membranes preparation. And it can be dissolved in various polar solvents such as dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, etc. It is very suitable for immersion precipitation phase inversion method membrane. [0003] In recent years, the research on PVC micro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/30B01D67/00
Inventor 陈良刚徐又一刘富
Owner HAINAN LITREE PURIFYING TECH CO LTD
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