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Composite reverse osmosis membrane with high-intensity anti-pollution layer and preparation method thereof

A reverse osmosis membrane, anti-pollution technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems that it is difficult to ensure the PVA antifouling layer, and the degree of cross-linking is difficult to achieve high, so as to improve the anti-fouling effect. Water scouring and dissolving performance, anti-pollution ability, and strength-enhancing effect

Inactive Publication Date: 2009-06-24
北京时代沃顿科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is worth noting that PVA is a water-soluble polymer material that is easily cross-linked. The cross-linking agent and catalyst are added to the PVA solution. On the premise that the PVA is not cross-linked before being coated on the surface of the reverse osmosis membrane, the PVA solution The crosslinking agent and catalyst must be controlled within a very low concentration range. Although the PVA antifouling layer prepared in this way has a certain degree of crosslinking, the degree of crosslinking is affected by the concentration of crosslinking agent and catalyst in the PVA solution. It is difficult to reach a high level of influence
Although the reverse osmosis membrane with low cross-linking degree prepared in this way has improved the ability of its PVA antifouling layer to withstand water washing and dissolution, it is still difficult to ensure that the PVA antifouling layer will be water-resistant for a long time under the long-term operation of the reverse osmosis membrane. Rinses and dissolves without shedding

Method used

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  • Composite reverse osmosis membrane with high-intensity anti-pollution layer and preparation method thereof
  • Composite reverse osmosis membrane with high-intensity anti-pollution layer and preparation method thereof
  • Composite reverse osmosis membrane with high-intensity anti-pollution layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: prepare composite reverse osmosis membrane according to the following steps:

[0021] (1) Preparation of A solution: take 3.75g of PVA with a degree of polymerization of 2600 and a degree of alcoholysis of 99% and dissolve it in 1496.25g of water, heat to 95°C, stir until completely dissolved to obtain a 0.25% PVA solution.

[0022] (2) Preparation of solution B: Weigh 32.0 g of glutaraldehyde and 40.0 g of hydrochloric acid and dissolve them in 328.0 g of water, stir well to obtain a mixed solution of 8% glutaraldehyde and 10% hydrochloric acid.

[0023] (3) The polysulfone support membrane with the polyamide dense layer polymerized on the outside is contacted with the A solution for 5s, removes excess solution, and forms a PVA layer on the polyamide surface; then this polysulfone support layer is contacted with the B solution for 5s, and then Place in an oven at 80°C for 10 minutes of cross-linking reaction to obtain a composite reverse osmosis membrane ...

Embodiment 2

[0025] Embodiment 2: prepare composite reverse osmosis membrane according to the following steps:

[0026] (1) Preparation of A solution: same as Example 1.

[0027] (2) Preparation of B solution: same as in Example 1.

[0028] (3) The polysulfone supporting membrane with the polyamide dense layer polymerized on the outside is contacted with the A solution for 10s, and the excess solution is removed to form a PVA layer on the polyamide surface; then this polysulfone supporting layer is contacted with the B solution for 5s, and then Place in an oven at 80°C for 10 minutes of cross-linking reaction to obtain a composite reverse osmosis membrane with a high-strength anti-pollution layer.

[0029] Take the diaphragm and test it on a cross-flow diaphragm testing platform under the test conditions of 2000ppm NaCl aqueous solution, 225psi operating pressure, temperature 25°C, and pH value 6.5-7.5. The results are shown in Table 1.

Embodiment 3

[0030] Embodiment 3: prepare composite reverse osmosis membrane according to the following steps:

[0031] (1) Preparation of A solution: same as Example 1.

[0032] (2) Preparation of B solution: same as in Example 1.

[0033] (3) The polysulfone support membrane with the polyamide dense layer polymerized on the outside is contacted with the A solution for 20s, and the excess solution is removed to form a PVA layer on the polyamide surface; then this polysulfone support layer is contacted with the B solution for 5s, and then Place in an oven at 80°C for 10 minutes of cross-linking reaction to obtain a composite reverse osmosis membrane with a high-strength anti-pollution layer.

[0034] Take the diaphragm and test it on a cross-flow diaphragm testing platform under the test conditions of 2000ppm NaCl aqueous solution, 225psi operating pressure, temperature 25°C, and pH value 6.5-7.5. The results are shown in Table 1.

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Abstract

The invention discloses a high-strength antipollution layer composite reverse osmosis membrane and a preparation method thereof. The composite reverse osmosis membrane comprises a non-woven fabric layer, a porous supporting layer and a dense polyamide layer, wherein the PVA antipollution layer with high crosslinking degree, which is formed through high-temperature crosslinking after being coated with a PVA solution and a solution containing a crosslinking agent and a catalyst in turn, is arranged on the surface of the dense polyamide layer. The composite reverse osmosis membrane increases the acting force between the antipollution layer and the dense polyamide layer and improves the strength of the PVA antipollution layer by constructing the PVA antipollution layer with high crosslinking degree on the surface of the dense polyamide layer of the prior reverse osmosis membrane so as to improve the scour resistance, the dissolution resistance and the antipollution ability of the reverse osmosis membrane and prolong the service life of the antipollution composite reverse osmosis membrane. Moreover, the composite reverse osmosis membrane also has the characteristics of easy preparation and operation, high water permeability and high salt retardation rate.

Description

technical field [0001] The invention relates to a high-strength anti-pollution layer composite reverse osmosis membrane with high water permeability and high salt retardation rate and a preparation method thereof, belonging to the technical field of water treatment. Background technique [0002] Reverse osmosis is a high-efficiency liquid membrane separation technology developed in recent decades. Because of the advantages of high purification rate and low cost, this technology has been widely used in seawater desalination, wastewater treatment, hard water softening, drinking water purification and other technical fields. With the development of membrane technology, its potential application fields will continue to expand. [0003] Membrane fouling is a key issue that plagues membrane applications. The fouling of reverse osmosis membrane will cause great economic loss, which seriously hinders the popularization and application of reverse osmosis membrane. PVA (polyvinyl a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D71/38B01D61/02C02F1/44
Inventor 邹昊金焱徐坚徐强强吴宗策赵宁
Owner 北京时代沃顿科技有限公司
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