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Polyolefine hollow fiber micro-filtration film with permanent hydrophilicity, and its prepn. method

A technology of polyolefins and microfiltration membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as not seeing

Inactive Publication Date: 2006-06-28
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Our country has not seen the production of similar hydrophilic membrane products, nor have we seen any published articles and reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The polypropylene hollow fiber microfiltration membrane with a pore size of 0.2 μm produced by the melt stretching method is made into a small membrane module. First soak the membrane module in absolute ethanol for 30 minutes, then install the membrane module on an ultrafiltration or microfiltration device, and use a 30°C, 2% glutaraldehyde solution for dead-end filtration or cross-flow filtration under a pressure of 0.1MPa 10 minutes, and then on the hydrophilic membrane preparation device, under the pressure of 0.2MPa, the dead-end filtration or cross-flow filtration of the membrane-forming solution containing 3% polyvinyl alcohol and 17% polyethylene glycol was circulated for 5 minutes at 30 ° C, and after the filtration was completed Place the membrane module in a constant temperature environment of 30°C for cross-linking reaction, take it out after 5 hours, and soak it in 30°C deionized water for 24 hours to prepare a polyolefin hollow fiber microfiltration membrane...

Embodiment 2

[0014] Change the filtration time of the membrane-forming liquid from 5 minutes to 10 minutes, and the rest are the same as in Example 1. Then the pure water permeability coefficient of the obtained hydrophilic membrane is 400-750L / m 2 ·hr·MPa. After the dried membrane is directly rehydrated, the measured pure water permeability coefficient is 350-650 / m 2 ·hr·MPa.

Embodiment 3

[0016] The temperature of the glutaraldehyde solution, the temperature of the film-forming solution, the temperature of the crosslinking reaction and the temperature of the soaking water were changed from 30°C to 50°C, and the rest were the same as in Example 1. Then the pure water permeability coefficient of the obtained hydrophilic membrane is 700-1000L / m 2 ·hr·MPa. After the dried membrane is directly rehydrated, its pure water permeability coefficient is measured to be 625-900L / m 2 ·hr·MPa.

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Abstract

A micro-filter membrane made of hollow polyolefin fibers and with permanent hydrophilicity is prepared from the ordinary basic membrane of hollow polyolefin fibers through immersing in alcohol or surfactant, filtering aldehyde solution and filming liquid containing PVA and / or polyethandiol or polyvinyl pyrrolidone, cross-linking reaction, immersing in deionized water and drying.

Description

Technical field: [0001] The invention relates to a polymer microfiltration membrane and a preparation method thereof, in particular to a polyolefin hollow fiber microfiltration membrane with permanent hydrophilicity and a preparation method thereof. Background technique: [0002] Polyolefin is a kind of separation membrane material with excellent performance. It has excellent physical and chemical properties. The microfiltration membrane prepared by using them not only has good separation performance, but also has good mechanical properties, and is resistant to acid, alkali and other chemicals. , Microbial corrosion resistance, is several commonly used membrane materials. Although its products have been used in many fields, due to the low surface energy of polyolefin, it has strong hydrophobicity and the contact angle is 62°-108°, which seriously affects the popularization and application of its film products. Therefore, it must be hydrophilized so that hydrophilic fluids i...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D71/26
Inventor 王立国高从堦王琳王铎李康乔宝文温建志王生春
Owner OCEAN UNIV OF CHINA
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