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Method for preparing anti-oxidative polyamide reverse osmosis membrane

A technology of oxidizing polyamide and reverse osmosis membrane, which is applied in chemical instruments and methods, reverse osmosis, semi-permeable membrane separation, etc., can solve the problem that it is difficult to achieve large-scale production, affects the membrane flux and sodium chloride removal rate, and the material ADMH is difficult to achieve. Obtaining and other issues to achieve the effect of improving antioxidant performance, cost saving, and ensuring removal rate

Inactive Publication Date: 2019-01-11
HUNAN KEENSEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN101816900A provides a method of grafting 3-propenyl 5,5-dimethylhydantoin (ADMH) on the surface of the membrane. Grafting can improve the oxidation resistance of the membrane, but the material ADMH is not easy to obtain. It is not easy to achieve, and the grafting reaction will generally affect the membrane flux and the removal rate of sodium chloride to a large extent.

Method used

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  • Method for preparing anti-oxidative polyamide reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The production method of anti-oxidation polyamide reverse osmosis membrane is as follows:

[0029] 1. Preparation of aqueous phase liquid: same as comparative example.

[0030] 2. The preparation of the oil phase solution: the same as the comparative example.

[0031] 3. Preparation of post-grafting treatment solution: Weigh 6 g of glutaraldehyde and add it to 1992 g of deionized water. After stirring for 5 minutes, add 2 g of tannic acid and continue stirring for 10 minutes to obtain a post-grafting treatment solution.

[0032] 4. Prepare the nascent reverse osmosis membrane with the same method as the comparative example, then immerse the nascent reverse osmosis membrane in the post-grafting treatment solution for 2 minutes, and finally dry the membrane in a 60°C oven for 3 minutes to obtain the antioxidant aromatic polymer Amide reverse osmosis membrane.

[0033] The membrane detection method is the same as that of the comparative example, and the results are shown...

Embodiment 2

[0035] The production method of anti-oxidation polyamide reverse osmosis membrane is as follows:

[0036] 1. Preparation of aqueous phase liquid: same as comparative example.

[0037] 2. The preparation of the oil phase solution: the same as the comparative example.

[0038] 3. Preparation of post-grafting treatment solution: Weigh 4 g of glyoxal and add it to 1992 g of deionized water, stir for 5 minutes, add 4 g of nitric acid, and continue stirring for 10 minutes to obtain a post-grafting treatment solution.

[0039] 4, film making method is the same as embodiment 1

[0040] The membrane detection method is the same as that of the comparative example, and the results are shown in Table 1.

Embodiment 3

[0042] The production method of anti-oxidation polyamide reverse osmosis membrane is as follows:

[0043] 1. Preparation of aqueous phase liquid: same as comparative example.

[0044] 2. The preparation of the oil phase solution: the same as the comparative example.

[0045] 3. Preparation of post-grafting treatment solution: Weigh 8 g of succinic dialdehyde and add it to 1991 g of deionized water. After stirring for 5 minutes, add 1 g of tannic acid, and continue stirring for 10 minutes to obtain a post-grafting treatment solution.

[0046] 4, film making method is the same as embodiment 1

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Abstract

The invention relates to a method for preparing an anti-oxidative polyamide reverse osmosis membrane. The method comprises the following steps: (1) coating with an aqueous phase solution; (2) coatingwith an oil phase solution; (3) grafting: impregnating a nascent polyamide reverse osmosis membrane obtained in step (2) in a grafting solution, and carrying out a reaction for a predetermined time; and (4) post-treating: drying a treated product obtained in step (3) at 50-70 DEG C to obtain the anti-oxidative polyamide reverse osmosis membrane. A preparation technology of the grafting solution comprises the following steps: adding 0.2-0.4 wt% of aliphatic dialdehyde or aliphatic polyaldehyde into deionized water, performing sufficient dissolving, adding 0.05-2 wt% of tannic acid or nitric acid or directly adding 0.3-0.5 wt% of glycidyl ether to the deionized water, and performing uniform stirring to obtain the grafting solution. The membrane prepared in the invention has good chlorine andoxidation resistance, and ensures the membrane flux and the sodium chloride removal rate, and the preparation method ahs the advantages of simplicity, cost saving, and easiness in realizing commercial large-scale production.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a preparation method of an anti-oxidation polyamide reverse osmosis membrane. Background technique [0002] Polyamide reverse osmosis membrane has the advantages of good water flux and separation performance, as well as low operating pressure, and has become the mainstream of commercial reverse osmosis membranes. However, due to the characteristics of polyamide materials, polyamide-based The reverse osmosis membrane is easily oxidized and degraded by oxidizing substances such as active chlorine, which leads to a sharp decline in the performance of the reverse osmosis membrane, shortens its service life, and largely limits the application and promotion of the polyamide reverse osmosis membrane. Therefore, how to improve the oxidation resistance of polyamide reverse osmosis membrane is the focus of current research. [0003] At present, research on anti-oxidation poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D71/56B01D67/00B01D61/02
CPCB01D61/025B01D67/0093B01D69/02B01D71/56B01D2325/30
Inventor 曾浩浩石楚道石世业
Owner HUNAN KEENSEN TECH CO LTD
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