Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for modifying polyolefin hollow fiber microporous membrane

A polyolefin and microporous membrane technology, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of high process conditions, uneven membrane surface properties, inconvenient transportation and storage, etc.

Inactive Publication Date: 2005-07-20
INST OF CHEM CHINESE ACAD OF SCI
View PDF5 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome that the polyolefin hollow fiber microporous membrane obtained by the existing modification method cannot be preserved in a dry state, transportation and storage are inconvenient, and the microporous membrane will gradually lose its hydrophilicity with the prolongation of its use time. The prepared membrane has defects such as inhomogeneous surface properties and high process conditions, and provides a method for modifying polyolefin hollow fiber microporous membranes to stabilize the physical and chemical properties of the prepared polyolefin hollow fiber microporous membranes.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Place 0.4 g of dry polyolefin hollow fiber microporous membrane in the reactor, evacuate to 50 Pa, fill with argon, repeat several times, ensure the argon atmosphere in the reactor, and re-evacuate to 15 Pa. The reactor was placed between the two electrodes of the radio frequency generator, and the polyolefin hollow fiber microporous membrane was pretreated for 0.5 minutes under the condition of a discharge power of 80W. Then, under the condition of cutting off the air, 40 ml of acrylic acid aqueous solution with a mass percent concentration of 2.5 wt% was added to the mixture, and the graft polymerization reaction was carried out at 60°C. After reacting for 4 hours, the membrane was taken out, immersed in water for 24 hours, and then extracted with acetone for 12 hours in an extractor to remove unreacted monomers and possible homopolymers. The obtained polyolefin hollow fiber microporous membrane was vacuum-dried, weighed, and the graft ratio G=2.6%.

[0015] The wate...

Embodiment 2

[0017] Place 0.4g of dry polyolefin hollow fiber microporous membrane in the reactor, vacuumize to 50Pa, fill with nitrogen, repeat several times, ensure the nitrogen atmosphere in the reactor, and then pump to 15Pa again. The reactor was placed between the two electrodes of the radio frequency generator, and the polyolefin hollow fiber microporous membrane was pretreated for 5 minutes under the discharge power of 40W. Then, under the condition of cutting off the air, 40 ml of acrylamide aqueous solution with a mass percent concentration of 5 wt % was added in advance to remove oxygen by vacuuming, and the graft polymerization reaction was carried out at 60° C. After reacting for 4 hours, the membrane was taken out, immersed in water for 24 hours, and then extracted with acetone for 12 hours in an extractor to remove unreacted monomers and possible homopolymers. The obtained polyolefin hollow fiber microporous membrane was vacuum-dried, weighed, and the graft ratio G=11.7%.

...

Embodiment 3

[0020] Place 0.4 g of dry polyolefin hollow fiber microporous membrane in the reactor, vacuumize to 50 Pa, fill with air, and pump to 15 Pa again. The reactor was placed between the two electrodes of the radio frequency generator, and the polyolefin hollow fiber microporous membrane was pretreated for 2 minutes under the discharge power of 80W. Then, under the condition of cutting off the air, 40 ml of an aqueous solution of hydroxyethyl methacrylate with a mass percent concentration of 5 wt % that was previously vacuumed to remove oxygen was added, and graft polymerization was carried out at 60° C. After reacting for 4 hours, the membrane was taken out, immersed in water for 24 hours, and then extracted with acetone for 12 hours in an extractor to remove unreacted monomers and possible homopolymers. The obtained polyolefin hollow fiber microporous membrane was vacuum-dried, weighed, and the graft ratio G=13.4%.

[0021] The water permeability of the polyolefin hollow fiber m...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention belongs to the field of polyolefine hollow fibre microporous membrane, in particular it relates to a method for making polyolefine hollow fibre microporous membrane implement modification treatment. Said method includes the following steps: placing polyolefine hollow fibre microporous membrane in a low-temperature plasma reactor, irradiating by plasma to produce lots of free radicals on the surface of membrane, then introducing active monomer and making graft polymerization reaction under a certain condition so as to obtain the membrane with required performance. after said membrane is undergone the process of modification treatment, its hydrophilic property is obviously raised, and its water permeable rate is 5-25 L / sq.m hr.

Description

technical field [0001] The invention belongs to the field of polyolefin hollow fiber microporous membranes, in particular to a method for modifying polyolefin hollow fiber microporous membranes. Background technique [0002] Polyolefin hollow fiber microporous membrane has stable chemical properties, strong mechanical properties, excellent permeability, cheap and easy-to-obtain raw materials, and simple manufacturing process, so it is an ideal microporous membrane. However, polyolefin is generally a material with strong hydrophobicity, and the typical hydrophobicity of polyolefin hollow fiber membranes limits its application range. In order to make it widely used in the industrial field, the surface properties of the microporous membrane must be improved or endowed with new separation functions through surface modification. The most commonly used modification method is to treat polyolefin hollow fiber membranes with ethanol to make them hydrophilic,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/04B01D71/26B01D71/78
Inventor 梁杰刘必前
Owner INST OF CHEM CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com