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A kind of anti-pollution and easy-to-clean polyamide reverse osmosis composite membrane and preparation method thereof

A technology of reverse osmosis composite membrane and polyamide, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of unstable modification effect and easy peeling off of the surface coating layer, and achieve cost reduction and Environmental impact, strong anti-pollution ability, and improved durability

Active Publication Date: 2016-01-20
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surface coating belongs to the category of physical modification. This method is simple and easy, but the surface coating layer is easy to fall off, so it is very limited in application; irradiation graft modification is an important surface graft modification method , has the advantages of safety, no pollution, and easy operation, but irradiation will cause homopolymerization and degradation of monomers; plasma modification technology has many advantages, which can quickly and effectively endow materials with new properties, and only change the surface of materials It has basically no effect on the body, but the plasma treatment will decay with time, making the modification effect unstable

Method used

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  • A kind of anti-pollution and easy-to-clean polyamide reverse osmosis composite membrane and preparation method thereof
  • A kind of anti-pollution and easy-to-clean polyamide reverse osmosis composite membrane and preparation method thereof
  • A kind of anti-pollution and easy-to-clean polyamide reverse osmosis composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation of amphoteric monomer 4-(2-sulfoethyl)-1-(4-vinylbenzyl) pyridine betaine (SVBP) comprises the following steps:

[0025] (1) Dissolve 18.72g (0.1mol) of 2-(4-pyridine)ethanesulfonic acid and 4g (0.1mol) of sodium hydroxide in 120ml of formamide at room temperature;

[0026] (2) Slowly drop 15.26g (0.1mol) of 4-chloromethylstyrene and a drop of nitrobenzene into the formamide solution under the protection of nitrogen;

[0027] (3) Stir at room temperature for 65 hours;

[0028] (4) Cool the reacted solution to 4°C in the refrigerator, and precipitate in ice acetone;

[0029] (5) Filtrate, and vacuum-dry the filtrate in a vacuum oven to obtain a crude product;

[0030] (6) Finally, crystallize in ice absolute ethanol to obtain salt-free pure SVBP monomer. See figure 1 .

Embodiment 2

[0032] A method for preparing an anti-pollution and easy-to-clean polyamide reverse osmosis composite membrane, comprising the steps of:

[0033] (1) Clean the polyamide reverse osmosis composite membrane with isopropanol and deionized water in sequence;

[0034] (2) Wash the 20cm×5cm polyamide reverse osmosis composite membrane, 4-(2-sulfoethyl)-1-(4-vinylbenzyl)pyridine betaine, potassium thiosulfate, sodium bisulfite And deionized water is added in the container, obtains 100 milliliters of aqueous solutions, makes 4-(2-sulfoethyl)-1-(4-vinylbenzyl) pyridine betaine concentration be 1mmol L -1 , the concentration of potassium thiosulfate is 2mmol·L -1 , the concentration of sodium bisulfite is 2mmol·L -1 , continue to feed nitrogen for 20 minutes to remove the oxygen in the container;

[0035] (3) Seal the container, react in a water bath at 60°C for 24 hours, take out the membrane, and wash it with pure water to obtain an anti-pollution and easy-to-clean polyamide revers...

Embodiment 3

[0037] A method for preparing an anti-pollution and easy-to-clean polyamide reverse osmosis composite membrane, comprising the steps of:

[0038] (1) Clean the polyamide reverse osmosis composite membrane with isopropanol and deionized water in sequence;

[0039] (2) Wash the 20cm×5cm polyamide reverse osmosis composite membrane, 4-(2-sulfoethyl)-1-(4-vinylbenzyl)pyridine betaine, potassium thiosulfate, sodium bisulfite And deionized water is added in the container, obtains 50 milliliters of aqueous solutions, makes 4-(2-sulfoethyl)-1-(4-vinylbenzyl) pyridine betaine concentration be 2mmol L -1 , the concentration of potassium thiosulfate is 1mmol·L -1 , the concentration of sodium bisulfite is 1mmol L -1 , continue to feed nitrogen for 15 minutes to remove the oxygen in the container;

[0040] (3) Seal the container, react in a water bath at 20°C for 24 hours, take out the membrane, and wash it with pure water to obtain an anti-pollution and easy-to-clean polyamide reverse o...

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Abstract

The invention discloses an anti-pollution and easily-washable polyamide reverse osmosis composite membrane and a preparation method of the membrane. The method disclosed by the invention comprises the following steps: (1) sequentially washing a polyamide reverse osmosis composite membrane by using isopropanol and de-ionized water; (2) adding the washed polyamide reverse osmosis composite membrane, 4-(2-sulfoethyl)-1-(4-vinyl benzyl)pyridine glycine betaine, potassium thiosulfate, sodium hydrogen sulfite and de-ionized water into a container; introducing nitrogen and discharging oxygen in the container; and (3) sealing the container and carrying out reaction in a water bath. The method is simple and convenient, conditions are moderate and the environment-friendly effect is realized; the prepared anti-pollution and easily-washable polyamide reverse osmosis composite membrane has the strong anti-pollution capability; after being polluted, the surface of the membrane can be physically washed by changing the salt concentration of input water; an organic chemical washing agent is not needed; the durability of the membrane is improved; the cost is reduced and the service life of the membrane is prolonged.

Description

technical field [0001] The invention relates to an anti-pollution and easy-to-clean polyamide reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] With the acceleration of social industrialization and population growth, the shortage of fresh water resources has become a major threat to human beings, and seawater desalination has become a key way to solve this problem. Conventional biochemical separation technology separates products with low purity and high energy consumption. It is difficult to effectively carry out selective separation, and often causes serious secondary pollution. Membrane separation technology is a new separation technology developed rapidly after the 1960s, which has the functions of separation, concentration and purification. Reverse osmosis technology is an economical and reliable separation method to solve the water crisis, and has been widely used in seawater and brackish water desalination, wastewater ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/78B01D69/12B01D67/00B01D69/02
Inventor 孟建强杜西兰曹震张宇峰
Owner TIANJIN POLYTECHNIC UNIV
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