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A kind of preparation method of reverse osmosis membrane containing buffer layer free interface polymerization

A technology of interface polymerization and reverse osmosis membrane, which is applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of membrane wrinkles and accumulation, achieve uniform thickness, improve desalination performance, and smooth structure

Active Publication Date: 2022-03-11
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a method for preparing a reverse osmosis membrane containing a buffer layer free interface polymerization in view of the shortcomings of the existing reverse osmosis membrane free interface polymerization process that causes the membrane to wrinkle and pile up

Method used

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  • A kind of preparation method of reverse osmosis membrane containing buffer layer free interface polymerization
  • A kind of preparation method of reverse osmosis membrane containing buffer layer free interface polymerization
  • A kind of preparation method of reverse osmosis membrane containing buffer layer free interface polymerization

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Embodiment 1

[0036] This embodiment provides a method for preparing a reverse osmosis membrane containing buffer layer free interface polymerization, the steps include:

[0037] S1. Soak the nylon 66 (PA66) base film in absolute ethanol for 60s at room temperature, then wash it with clean water, then sonicate it in deionized water for 150s until no water droplets gather on its surface, and store it in deionized water for later use.

[0038] S2. Take m-xylylenediamine (m-XDA) and dissolve it in deionized water, configure 0.3wt% m-XDA solution, dissolve trimesoyl chloride (TMC) in n-hexane, configure 0.15wt% TMC solution.

[0039] S3. Put the PA66 base film on the bottom of the reactor, pour 20mL of m-XDA aqueous solution into the reactor, and ensure that the upper surface of the base film is more than 1cm away from the surface of the water phase, and add n-hexane with a thickness of 3.5mm to cover the water phase The surface is used as a buffer layer, and finally 5ml of TMC solution is slow...

Embodiment 2

[0042] The process of this embodiment is the same as that of embodiment 1, the difference being that 0.4wt% m-XDA solution and 0.2wt% TMC solution are used in this embodiment.

Embodiment 3

[0044] The process of this embodiment is the same as that of embodiment 1, the difference being that 0.5wt% m-XDA solution and 0.25wt% TMC solution are used in this embodiment.

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Abstract

The invention discloses a method for preparing a reverse osmosis membrane containing a buffer layer free interface polymerization. The invention adds a buffer layer between the water phase and the organic phase in the reverse osmosis membrane prepared by free interface polymerization, so as to slow down the intensity of the polymerization reaction and The inhomogeneity makes the reverse osmosis membrane formed by free interface polymerization uniform and dense, so as to solve the problems of uneven distribution of reaction monomers and severe local reactions in free interface polymerization, avoid wrinkles and accumulation of the dense layer of reverse osmosis membrane, and improve the reaction rate. The desalination performance and chlorine resistance performance of the permeable membrane can effectively control the polymerization reaction at the interface. The method of the invention is simple in operation and low in cost, and can realize batch and rapid preparation of reverse osmosis membranes with uniform structure, excellent desalination performance, good chlorine resistance performance and excellent stability.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a preparation method of a reverse osmosis membrane containing buffer layer free interface polymerization. Background technique [0002] The shortage of water resources is still a major challenge facing mankind today, and reverse osmosis technology is an advanced seawater desalination technology today. Reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics made by simulating biological semipermeable membrane, and is the core component of reverse osmosis technology. The principle of reverse osmosis technology is to separate these substances from water based on the fact that other substances cannot pass through the semi-permeable membrane under the action of the osmotic pressure higher than the solution. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D71/56B01D61/02
CPCB01D67/0002B01D69/02B01D69/125B01D71/56B01D61/025B01D2325/30Y02A20/131
Inventor 米皓阳张青经鑫刘跃军
Owner HUNAN UNIV OF TECH