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Asymmetric composite membranes and modified substrates used in their preparation

A composite membrane, asymmetric technology, applied in the direction of membrane, application, membrane technology, etc., can solve the problems of undisclosed graft polymer chemical and physical properties, etc.

Active Publication Date: 2018-01-19
HYDROXSYS HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No experimental results are disclosed regarding the chemical and physical properties of the grafted polymers prepared by using these other hydrophilizing agents

Method used

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  • Asymmetric composite membranes and modified substrates used in their preparation
  • Asymmetric composite membranes and modified substrates used in their preparation
  • Asymmetric composite membranes and modified substrates used in their preparation

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Embodiment Construction

[0096] The present invention resides, in part, in the preparation of water permeable hydrophilic microporous polyethylene ([mu]PE) sheets which can be advantageously used as backing layers for the preparation of durable asymmetric composite membranes. According to the invention, the backing layer was prepared by photoinitiated graft polymerization of [mu]PE sheets containing selected hydrophilizing agents (Table 1). The hydrophilizing agent is selected to provide a graft polymer with chemical and physical properties determined by the intended use of the asymmetric composite membrane. The method uses UVA irradiation to reduce the risk of injury to operators and to allow easy control of the rate and extent of modification of the microporous polyolefin substrate. Irradiation time for microporous substrates was limited to less than 5 minutes. Furthermore, it is believed that the use of a solvent system (e.g. 1:1 (v / v) acetone-water) in which the photoinitiator (e.g. benzophenone)...

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Abstract

Durable asymmetric composite membranes consisting of a film of cross-linked poly(ether ether ketone) adhered to a sheet of hydrophilic microporous poly(ethylene) are disclosed. The membranes are suitable for use in the recovery or removal of water from feed streams where repeated clean-in-place protocols are required such as in the processing of dairy products.

Description

technical field [0001] The present invention relates in part to the chemical and physical properties of modified microporous polyolefin substrates. The invention also relates to asymmetric composite membranes prepared using these modified substrates. In particular, the present invention relates to the use of modified microporous polyethylene sheets in the preparation of durable asymmetric composite membranes for the removal of water from dairy feed streams. Background technique [0002] The use of photografting to modify the surface of films, sheets and moldings formed from polyolefins is well known. For example, the publication of Tazuke and Kimura (1978) discloses photografting of poly(propylene), poly(ethylene), and several other polymer films using benzophenone as a sensitizer. In this publication, it is noted that the choice of solvent and sensitizer is very important. The publication of Ang et al. (1980) discloses an irradiation method in which a sensitizer is disso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/26B01D67/00A23C9/14
CPCA23C9/14B01D69/12B01D67/009B01D2323/30B01D71/261B01D67/00931B01D71/262B01D71/5222B01D2325/022B01D67/00
Inventor 马克·埃斯里
Owner HYDROXSYS HLDG