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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 relatively strict, and the temperature and humidity changes have a great influence on the deposition rate. (3) The sediments self-aggregate to form large particles, resulting in poor membrane uniformity and serious membrane pore clogging

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
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Effect test

Embodiment 1

[0059] Polyethylene (Mn=3×10 6 ) Microporous membrane (average pore diameter 0.058 micron, porosity 47%, thickness 20 micron) cleans and dries with isopropanol, then immerses in 2wt% polyvinyl alcohol (alcoholysis degree 98%, molecular weight 110000) solution, with 0.5wt% For glutaraldehyde crosslinking, the content of surfactant SDBS in the hydrophilic agent is 10wt%, and after standing for 10 minutes, transfer to an oven to heat, and crosslink at 70°C for 10 minutes. After completion, take it out and put it into 40wt% ethanol aqueous solution to remove excess hydrophilic agent to obtain a hydrophilic polyethylene microporous membrane.

[0060] Pour the aqueous phase solution containing 2wt% of piperazine into the hydrophilic polyethylene membrane frame, the content of ethylenediamine in the solution is 1wt%, the content of precipitated silica is 0.5wt%, take it out after 5min, and extrude it with a polyurethane roller Excess liquid on the surface; finally pour n-hexane cont...

Embodiment 2

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

[0065] Pour the aqueous phase solution containing 2wt% of piperazine into the hydrophilic polyethylene membrane frame, the content of ethylenediamine in the solution is 1wt%, the content of precipitated silica is 0.5wt%, take it out after 5min, and extrude it with a polyurethane roller Excess liquid on the surf...

Embodiment 3

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

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