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Reinforced hollow fiber composite membrane and preparation method thereof

A fiber composite and reinforced technology, which is applied in the field of separation membrane composite material preparation, can solve the problems of reducing the strength of hollow fiber membrane filaments, difficulty in ensuring uniformity, and high feasibility of polyamide desalination layer, achieving high tensile strength and strengthening mechanical properties. The effect of intensity

Inactive Publication Date: 2016-07-27
BEIJING ORIGIN WATER FILM TECH
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Problems solved by technology

[0007] However, due to the structural characteristics of the hollow fiber membrane, it is difficult to ensure the uniformity of the polyamide desalination layer synthesized on the outer surface of the hollow fiber through interfacial polymerization; while the feasibility of synthesizing the polyamide desalination layer on the inner surface of the hollow fiber is more high
In order to reduce the membrane area loss caused by the composite form of the inner surface, the hollow fiber membrane should adopt a thin-walled structure, that is, the wall thickness / outer diameter<0.15, and this structure will greatly reduce the strength of the hollow fiber membrane

Method used

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  • Reinforced hollow fiber composite membrane and preparation method thereof

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[0037] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.

[0038] Concrete technical scheme of the present invention is as follows:

[0039] Such as figure 1 As shown, a reinforced hollow fiber composite membrane includes an outer network structure 1, a middle porous transition layer 2, and an inner polyamide desalination layer 3; the thickness of the outer network structure 1 is 50-500 μm; the The porosity of the middle porous transition layer 2 is 50-85%, the thickness is 50-300 μm, and the inner surface pore diameter is 5-50 nm; the pure water flux of the inner polyamide desalination layer 3 is 10-100 L / (m 2 ·h·MPa), the diffusion rate of sodium chloride is 0.05-5L / (m 2 h); the tensile force of the reinf...

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Abstract

The invention discloses a reinforced hollow fiber composite membrane and a preparation method thereof.The preparation method is characterized in that hollow fiber ultrafiltration membrane yarn with an inner separation layer is prepared with a wet spinning process, filaments are adopted for knitting or crocheting on the outer surface of the hollow fiber membrane yarn, and a reinforced hollow fiber base membrane is obtained; a polyamide desalted layer is composited in an inner cavity of a fiber tube with an interfacial polymerization method, and the reinforced hollow fiber composite membrane is obtained.Higher mechanical strength of the membrane yarn is achieved with a netted support, and thus the reinforced hollow fiber composite membrane is suitable for the reverse osmosis and pressure-retarded osmosis processes performed at high pressure.

Description

technical field [0001] The invention relates to the technical field of preparation of separation membrane composite materials, in particular to a reinforced hollow fiber composite membrane and a preparation method thereof. Background technique [0002] The synthesis of artificial semipermeable membranes has laid a technical foundation for reverse osmosis membrane processes such as membrane seawater desalination and brackish water desalination, and has promoted the development of membrane water treatment technology. [0003] At present, the reverse osmosis membrane mainly adopts polyamide film composite roll type reverse osmosis membrane and hollow fiber reverse osmosis membrane. [0004] On the one hand, the polyamide composite membrane has the characteristics of high flux and high rejection rate. However, the production process of roll-type membrane elements is complex, with a high degree of refinement, and requires a large amount of non-membrane materials, such as concent...

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D69/08B01D67/00
CPCB01D71/56B01D67/0006B01D69/08B01D69/12
Inventor 陈亦力丑树人彭文娟夏建中林勇
Owner BEIJING ORIGIN WATER FILM TECH
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