Preparation process of epoxy modified reverse osmosis membrane, reverse osmosis membrane and application of reverse osmosis membrane

A reverse osmosis membrane, epoxy modification technology, applied in osmosis/dialysis water/sewage treatment, reverse osmosis, semi-permeable membrane separation, etc. , The effect of low production cost and easy industrial production

Pending Publication Date: 2022-03-08
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the present inventors unexpectedly found that after hydrophilic modification of polyolefin-based membranes, while carrying hydrophilic active groups such as carboxyl or hydroxyl groups, the membrane surface will also have many defects. If it is directly used for reaction Permeable membrane preparation, it is difficult to obtain a high salt rejection rate

Method used

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  • Preparation process of epoxy modified reverse osmosis membrane, reverse osmosis membrane and application of reverse osmosis membrane
  • Preparation process of epoxy modified reverse osmosis membrane, reverse osmosis membrane and application of reverse osmosis membrane
  • Preparation process of epoxy modified reverse osmosis membrane, reverse osmosis membrane and application of reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The polyethylene film was subjected to corona treatment for 4 minutes at a voltage of 2.5 kv; the treated polyethylene film was immersed in 50% ethanol solution for 2 minutes. Subsequently, pure water was replaced for 2 minutes to obtain a polyethylene porous support layer A with a surface hydrophilized modification.

Embodiment 2

[0055] The polypropylene film was subjected to corona treatment for 4 minutes at a voltage of 2.5 kv; the treated polyethylene film was immersed in 50% ethanol solution for 2 minutes. Subsequently, the pure water was replaced for 2 minutes to obtain the surface hydrophilic modified polypropylene porous support layer B.

[0056] 【Example 1】

[0057] Refer to the raw material information in Table 2 and prepare epoxy modified reverse osmosis membrane according to the following method:

[0058] (1) Prepare an acetone solution of epoxy resin, apply it on the polyolefin porous support layer on one side, let it stand for 2 minutes, remove excess solution, wash and replace with pure water;

[0059] (2) The polyolefin porous support layer after coating is immersed in the aqueous phase solution of m-phenylenediamine, contacts 30s; Take out and remove unnecessary aqueous phase, then it is immersed in the organic phase solution of trimesoyl chloride (solvent is isopar G isoparaffin), co...

Embodiment 2-10

[0063] The epoxy-modified reverse osmosis membranes in Examples 2-10 were respectively prepared according to the method basically the same as that of Example 1, and the only difference was that the types and proportions of raw materials were added correspondingly with reference to Table 2.

[0064] Table 2, each embodiment raw material information

[0065]

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Abstract

The invention discloses a preparation process of an epoxy modified reverse osmosis membrane, the reverse osmosis membrane and application of the reverse osmosis membrane. The preparation process comprises the following steps: 1) performing surface hydrophilic modification on a polyolefin porous support layer; 2) carrying out surface coating on the polyolefin porous supporting layer obtained in the step 1) by adopting epoxy resin to obtain a polyolefin substrate film; 3) contacting the polyolefin substrate membrane with a water-phase solution of polyfunctional aromatic polyamine, then contacting the polyolefin substrate membrane with an oil-phase solution of polyfunctional aromatic acyl chloride, and carrying out interfacial polymerization reaction to form a composite membrane containing polyamide; 4) exposing the composite membrane in a nitrous acid solution for post-treatment; and rinsing and drying to obtain the epoxy modified reverse osmosis membrane. The reverse osmosis membrane prepared by the method has the performance of high desalination rate on the basis of obtaining high flux through hydrophilic modification.

Description

technical field [0001] The invention relates to a reverse osmosis membrane, in particular to a preparation process of an epoxy-modified reverse osmosis membrane, a reverse osmosis membrane and an application thereof. Background technique [0002] Reverse osmosis membrane application technology, also known as reverse osmosis, is one of the most advanced water treatment technologies in the contemporary era. It is widely used, such as seawater desalination, pure water production, concentration and separation of aqueous solutions, etc. At present, the mainstream reverse osmosis membrane on the market is an aromatic polyamide reverse osmosis composite membrane, which includes a membrane structure of a non-woven support layer, a porous carrier intermediate layer and a polyamide desalination layer. In recent years, some scholars have carried out studies on polyolefin (such as polyethylene) microporous membranes as substrates, and then formed polyamide desalination layers through in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00C02F1/44
CPCB01D61/025B01D67/0006C02F1/441B01D2325/36Y02A20/131
Inventor 高翔邬军辉苏蕾赵伟国孙家宽
Owner WANHUA CHEM GRP CO LTD
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