Hydrophilic polyolefin-based composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and olefin-based membrane technology, which is applied in the field of hydrophilic polyolefin-based composite nanofiltration membrane and its preparation, can solve the problems of poor membrane uniformity, cumbersome operation steps, and long time required to achieve flux retention time Long, wide application range, simple and easy operation

Pending Publication Date: 2019-04-09
JIANGXI TONRY NEW ENERGY TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the disadvantages of the co-deposition method are obvious: (1) it takes a long time, which is not conducive to industrial continuous scale production; (2) the operation steps are cumbersome, the control conditions are re

Method used

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  • Hydrophilic polyolefin-based composite nanofiltration membrane and preparation method thereof
  • Hydrophilic polyolefin-based composite nanofiltration membrane and preparation method thereof
  • Hydrophilic polyolefin-based composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0058] Example 1

[0059] The polyethylene (Mn=3×10 6 ) microporous membrane (average pore size 0.058 microns, porosity 47%, thickness 20 microns) was cleaned and dried with isopropyl alcohol, and then immersed in 2wt% polyvinyl alcohol (alcoholysis degree 98%, molecular weight 110000) solution, with 0.5wt% Glutaraldehyde is cross-linked, and the content of the surfactant SDBS in the hydrophilic agent is 10 wt %. After standing for 10 min, it is transferred to the oven to heat, and cross-linked at 70° C. for 10 min. After completion, take out and put in 40wt% ethanol aqueous solution to remove excess hydrophilic agent to obtain a hydrophilic polyethylene microporous membrane.

[0060] The aqueous phase solution containing 2wt% piperazine was poured into the frame of the hydrophilic polyethylene membrane, the content of ethylenediamine in the solution was 1wt%, and the content of precipitated silica was 0.5wt%, taken out after 5min, and extruded with a polyurethane pressing ro...

Example Embodiment

[0063] Example 2

[0064] The polyethylene (Mn=6×10 6 ) microporous membrane (average pore size 0.043 microns, porosity 35.4%, thickness 16 microns) was cleaned and dried with isopropanol, and then immersed in 8wt% polyvinyl alcohol (alcoholysis degree 98%, molecular weight 110000) solution, with 0.5wt% Maleic anhydride is cross-linked, and the content of the surfactant sodium polystyrene sulfonate in the hydrophilic agent is 10 wt %. After standing for 10 minutes, it is transferred to an oven to heat, and cross-linked at 70° C. for 20 minutes. After completion, take out and put in 40wt% ethanol aqueous solution to remove excess hydrophilic agent to obtain a hydrophilic polyethylene microporous membrane.

[0065] The aqueous phase solution containing 2wt% piperazine was poured into the frame of the hydrophilic polyethylene membrane, the content of ethylenediamine in the solution was 1wt%, and the content of precipitated silica was 0.5wt%, taken out after 5min, and extruded wi...

Example Embodiment

[0068] Example 3

[0069] Adjust the amount of precipitated silica, increase its content to 5wt%, ultrasonic for 10min, increase the interfacial polymerization time to 120s, and other conditions are the same as Example 2.

[0070] The test of Example 3 shows that the pure water flux reaches 126.8L / m2.h per bar, indicating that increasing the amount of precipitated silica has a certain effect on improving the flux, but the rejection rate of sodium chloride is reduced to 36.6%, and the sodium sulfate It is reduced to 87.2%, indicating that the pore size of the formed polyamide skin layer is too large, and defects are formed, resulting in a general decrease in the retention rate.

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Abstract

The invention relates to a hydrophilic polyolefin-based composite nanofiltration membrane. The membrane is characterized in that a polyolefin microporous membrane is immersed in a hydrophilic agent toobtain a hydrophilically modified polyolefin membrane; and a polyamide selective skin layer is formed by interfacial polymerization of polyamine water-phase monomers and poly acyl chloride oil-phasemonomers on the hydrophilically modified polyolefin membrane. The membrane disclosed by the invention has the positive effects that compared with a traditional ultrafiltration base, the adopted polyolefin film base is higher in water flux, long in flux retention time and stable in performance; a hydrophilic modification process of the polyolefin film is simple and easy to operate and strong in controllability and the modified membrane can be permanently hydrophilic, so that a capability of continuous large-scale industrial production is provided; and the composite nanofiltration membrane prepared by adopting the polyolefin base is high in water flux, low in NaCl intercepting rate and high in Na2SO4 intercepting rate and has a good charge separating ability.

Description

technical field [0001] The invention relates to the technical field of membrane filtration, in particular to a composite nanofiltration membrane with a hydrophilic polyolefin substrate and a preparation method thereof. Background technique [0002] Membrane water treatment technology is a method of separating, enriching and purifying the components in the solvent by using a membrane with selective permeation. It has the advantages of high efficiency, energy saving, and simple process. It is the core process of current water treatment technology. According to the different pore sizes, the membranes are divided into microfiltration membranes, ultrafiltration membranes, nanofiltration membranes and reverse osmosis membranes. Wherein, the pore diameter of the nanofiltration membrane is between the ultrafiltration membrane and the reverse osmosis membrane, which is about 1 nm, and the molecular weight cut-off is 300-500 Daltons. It is generally believed that the mechanism of nan...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D69/12B01D67/00B01D61/00
CPCB01D61/027B01D67/0006B01D69/12B01D71/26B01D2325/36
Inventor 程跃王英杰邱长泉
Owner JIANGXI TONRY NEW ENERGY TECH DEV CO LTD
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