Reverse osmosis membrane with PE microporous membrane as base material and preparation method of reverse osmosis membrane

A technology of reverse osmosis membrane and microporous membrane, which is applied in the direction of reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc. Uneven pore size on the surface of the membrane, etc., to achieve excellent water flux and rejection rate, small pore size, and uniform polyamide layer

Pending Publication Date: 2021-05-28
宁波日新恒力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the pore size distribution of the base membrane of the reverse osmosis membrane is not uniform at present, and the surface pore size of the reverse osmosis membrane will be uneven during the reaction process of the polyamide film, which will eventually affect the flux and rejection rate of the reverse osmosis membrane.

Method used

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  • Reverse osmosis membrane with PE microporous membrane as base material and preparation method of reverse osmosis membrane

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preparation example Construction

[0034] The present invention also provides a method for preparing the above-mentioned reverse osmosis membrane with the PE microporous membrane as the substrate, comprising the following steps:

[0035] 1) Coating the polysulfone casting liquid on the surface of the PE microporous membrane, and obtaining the PE microporous membrane covered with the polysulfone layer after curing;

[0036] 2) Add m-phenylenediamine, triethylamine and camphorsulfonic acid into deionized water, and stir magnetically to obtain an aqueous phase solution; add trimesoyl chloride to n-hexane, stir until dissolved, and obtain trimesoyl chloride- n-hexane oil phase solution; immerse the PE microporous membrane covered with polysulfone layer obtained in step 1) into the water phase solution, remove the solvent after taking it out, and then immerse in the prepared trimesoyl chloride-n-hexane oil phase solution Carry out interfacial polymerization reaction to form a polyamide layer, remove the solvent n-he...

Embodiment 1

[0048] The reverse osmosis membrane with PE microporous membrane as the base material includes PE microporous membrane, polysulfone layer coated on the PE microporous membrane and polyamide layer coated on the polysulfone layer; the pore size of the PE microporous membrane is 0.01-10μm, porosity 70-95%, thickness 20-120μm;

[0049] PE microporous membrane includes high-density PE, chain extender, hydrophilic polymer and inorganic particles; the mass ratio of high-density PE, chain extender, hydrophilic polymer and inorganic particles is 2:1:2:1. The hydrophilic polymer is polyacrylic acid; the inorganic particles are titanium dioxide; the chain extender is phthalic anhydride;

[0050] Above-mentioned PE microporous membrane is the preparation method of the reverse osmosis membrane of substrate, comprises the following steps:

[0051] 1) Mix high-density PE, chain extender, hydrophilic polymer and inorganic particles with a mass ratio of 2:1:2:1 and pour them into a screw extrud...

Embodiment 2

[0056] The reverse osmosis membrane with PE microporous membrane as the base material includes PE microporous membrane, polysulfone layer coated on the PE microporous membrane and polyamide layer coated on the polysulfone layer; the pore size of the PE microporous membrane is 0.01-10μm, porosity 70-95%, thickness 20-120μm;

[0057] PE microporous membrane includes high-density PE, chain extender, hydrophilic polymer and inorganic particles; the mass ratio of high-density PE, chain extender, hydrophilic polymer and inorganic particles is 2:1:2:1. The hydrophilic polymer is polyacrylic acid; the inorganic particles are titanium dioxide; the chain extender is phthalic anhydride;

[0058] Above-mentioned PE microporous membrane is the preparation method of the reverse osmosis membrane of substrate, comprises the following steps:

[0059] 1) Mix high-density PE, chain extender, hydrophilic polymer and inorganic particles with a mass ratio of 2:1:2:1 and pour them into a screw extr...

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Abstract

The invention discloses a reverse osmosis membrane with a PE microporous membrane as a base material and a preparation method of the reverse osmosis membrane. The reverse osmosis membrane comprises the PE microporous membrane, a polysulfone layer coating the PE microporous membrane and a polyamide layer coating the polysulfone layer, the pore diameter of the PE microporous membrane is 0.01-10 microns, the porosity is 70-95%, and the thickness is 20-120 microns. The PE microporous membrane is small in aperture and excellent in homogeneity, the surface of the PE microporous membrane is coated with the polysulfone layer, and due to the fact that organic solvents such as DMF, DMAc, NMP or DMSO are adopted during polysulfone coating, the PE microporous membrane is easily dissolved in the solvents, the PE microporous membrane can be subjected to permeation etching, and the aperture of the surface of the polysulfone layer becomes small and is more uniform. The pore diameter of the polysulfone layer is more uniform, so that the defects of the polyamide layer in the polymerization process are reduced, the polyamide layer is more uniform, and the performance is more excellent. The prepared reverse osmosis membrane has excellent water flux and rejection rate.

Description

technical field [0001] The invention belongs to the field of reverse osmosis membranes, in particular to a reverse osmosis membrane with a PE microporous membrane as a base material and a preparation method thereof. Background technique [0002] Reverse osmosis is an efficient water purification method, which has the advantages of high efficiency, low cost, no phase change, easy integration, modularization and automation, etc. It is widely used in the preparation of high-purity water in the electronics industry, medical water preparation, seawater desalination, Water desalination, sewage recycling and many other fields. With the shortage of global fresh water resources and the increasingly serious water pollution, reverse osmosis technology is playing an increasingly important role in water purification. [0003] However, the pore size distribution of the base membrane of the reverse osmosis membrane is not uniform at present, and the surface pore size of the reverse osmosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/64B01D71/26B01D69/12B01D67/00B01D61/02
CPCB01D71/68B01D71/64B01D71/26B01D69/12B01D67/0002B01D61/025
Inventor 不公告发明人
Owner 宁波日新恒力科技有限公司
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