High-selectivity composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and high-selectivity technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of increasing the cleaning cycle of membrane elements, easily polluting nanofiltration membranes, and reducing the life of membrane elements, etc. problem, to achieve the effect of improving pollution resistance, increasing thickness and prolonging service life
CN101934201AInactive Publication Date: 2011-01-05北京时代沃顿科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
北京时代沃顿科技有限公司
Publication Date
2011-01-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a high-selectivity composite nanofiltration membrane and a preparation method thereof. The high-selectivity composite nanofiltration membrane comprises a nonwoven layer and a polymer porous supporting layer; and the porous supporting layer is provided with one or two polyamide surface layers prepared by reacting polyamine and / or amine polyalcohol with chlorine polyacyl. Compared with the prior art, by forming one or two polyamide surface layers on the porous supporting layer through an interfacial polymerization method, the nanofiltration membrane has increased thickness of a surface layer, has more smooth, hydrolysis-resistant, oxidation-resistant and scratch-resistant surface, and improves pollution resistance; and the surface of the membrane can carry negative or positive charges, so that the composite nanofiltration membrane has a high-selectively functional desalting layer; besides, the method for preparing the composite nanofiltration membrane is simple to operate, high water flux and desalination rate are ensured under low pressure, and the service life of the membrane component is prolonged.
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Description

technical field

[0001] The invention relates to a composite nanofiltration membrane and a preparation method thereof, in particular to a composite nanofiltration membrane with a highly selective functional desalination layer and an interface polymerization preparation method thereof. Background technique

[0002] Separation membrane is a high-efficiency and energy-saving separation material with broad application prospects. Nanofiltration membranes first appeared in the late 1970s and are one of the fastest-growing membrane varieties in the world in recent years, and have become a research hotspot in the field of separation membranes. Nanofiltration membrane is a pressure-driven membrane whose separation performance is between that of reverse osmosis membrane and ultrafiltration membrane. However, the rejection rate of polyvalent salts and small organic molecules with a relative molecular weight above 300 is relatively high. The interception performance of composite nanofi...

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
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