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Method for producing light-pollution reverse osmosis composite film

A reverse osmosis membrane and production method technology, applied in the field of water treatment, can solve problems such as difficult operation, high degree of saponification, loss of protective layer, etc., and achieve improved pollution resistance, improved hydrophilicity, high desalination rate and water flow volume effect

Active Publication Date: 2007-03-07
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Chinese Patent Publication No. CN1213985A discloses a "reverse osmosis composite membrane and its method for reverse osmosis treatment of water", wherein the reverse osmosis composite membrane is exactly a low-pollution composite reverse osmosis membrane, although PVA is used to coat polyamide layer surface, but the PVA used in it has a high degree of saponification (99%), which requires a relatively high water temperature for dissolution, close to 80 ° C, and is difficult to operate
Moreover, because the PVA molecular chain is not cross-linked and does not form a three-dimensional molecular structure, the PVA layer is easy to gradually dissolve in water during the use of the diaphragm, and eventually loses its protective layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The production method of low-pollution composite reverse osmosis membrane comprises the following steps:

[0015] (1) Preparation of A solution: Dissolve 2.5 kg of m-phenylenediamine and 0.5 kg of sodium lauryl sulfate in 97.0 kg of water, and stir to obtain A solution.

[0016] (2) Preparation of solution B: 0.1 kg of trimesoyl chloride was dissolved in 100 kg of naphtha (Naphtha, Shell Chemicals) to obtain solution B.

[0017] (3) Preparation of solution C: 2kg of polyvinyl alcohol (PVA) with an average degree of polymerization of 1000 (n=1000) and a degree of saponification of 75% is dissolved in 97.7kg of hot water at 60°C, and after fully stirring for 10 minutes , then add 0.2kg of glutaraldehyde and 0.1kg of hydrochloric acid, and continue to stir for 30 minutes to fully react to form a C solution.

[0018] (4) Coating solution A on the polysulfone support layer, removing excess solution A, and then contacting the support layer with solution B to form a polyamide...

Embodiment 2

[0021] The production method of low-pollution composite reverse osmosis membrane comprises the following steps:

[0022] (1) Preparation of A solution: Dissolve 2.5 kg of m-phenylenediamine and 0.5 kg of sodium dodecylbenzenesulfonate in 97.0 kg of water, and stir to obtain A solution.

[0023] (2) The preparation of B solution: with embodiment 1.

[0024] (3) Preparation of solution C: 2kg of polyvinyl alcohol (PVA) with an average degree of polymerization of 500 (n=500) and a degree of saponification of 75% is dissolved in 97.7kg of hot water at 60°C, and after fully stirring for 10 minutes , then add 0.2kg of melamine and 0.1kg of hydrochloric acid, and continue to stir for 30 minutes to fully react to form a C solution.

[0025] Remaining steps are with embodiment 1.

[0026] The contact angle was measured to be 21°. Then adopt the same test method as Example 1, and the obtained results are shown in Table 1.

Embodiment 3

[0028] The production method of low-pollution composite reverse osmosis membrane comprises the following steps:

[0029] (1) Preparation of A solution: Dissolve 2.5 kg of m-phenylenediamine and 0.5 kg of N-methylpyrrolidone in 97.0 kg of water, and stir to obtain A solution.

[0030] (2) Preparation of B solution: same as in Example 1.

[0031] (3) Preparation of solution C: 2kg of polyvinyl alcohol (PVA) with an average degree of polymerization of 1000 (n=1000) and a degree of saponification of 75% is dissolved in 97.7kg of hot water at 60°C, and after fully stirring for 10 minutes , then add 0.2kg of glyoxal and 0.1kg of hydrochloric acid, and continue to stir for 30 minutes to fully react to form a C solution.

[0032] Remaining steps are with embodiment 1.

[0033] The contact angle was measured to be 20°. Then adopt the same test method as Example 1, and the obtained results are shown in Table 1.

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Abstract

The invention relates to a method for producing low-pollution composite inverse penetration film. Wherein, it comprises that (1), preparing A solution; (2), preparing B solution; (3), preparing C solution that dissolving polyvinyl alcohol whose average polymer degree is n=500-3000 and saponification degree is 75% into hot water at 60Deg. C to prepare the solution whose density is 2.0%; adding one of fatty group, heat convertible resin, or zirconyl ammonium carbonate at 0.2% and the HCl at 0.1%; mixing for 30mins, to form C solution; (4), coating A solution on polysulfone support layer, to form A solution layer; contacting support layer with B solution, drying to form polysulfone layer; coating C solution on polyamide layer, drying.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a production method of a low-pollution composite reverse osmosis membrane. Background technique [0002] Chinese Patent Publication No. CN1213985A discloses a "reverse osmosis composite membrane and its method for reverse osmosis treatment of water", wherein the reverse osmosis composite membrane is exactly a low-pollution composite reverse osmosis membrane, although PVA is used to coat polyamide layer surface, but the degree of saponification (99%) of the PVA used in it requires higher water temperature when dissolving like this, close to 80°C, which is difficult to operate. And because the PVA molecular chain is not cross-linked and does not form a three-dimensional molecular structure, the PVA layer is easy to gradually dissolve in water during the use of the diaphragm, and eventually loses its protective layer effect. Contents of the invention [0003] The object...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12
Inventor 吴宗策蔡志奇刘霞龙昌宇刘枫王思亮
Owner VONTRON TECH CO LTD
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