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Preparation method of multilayer reverse osmosis composite membrane

A reverse osmosis composite membrane and reverse osmosis membrane technology are applied in the field of preparation of multi-layer reverse osmosis composite membranes, which can solve the problems of decreased water flux through the membrane, mechanical damage and wear on the membrane surface, and achieves simple process and mild conditions. Effect

Inactive Publication Date: 2020-05-29
XIAMEN JIANGTIAN MEMBRANE BIOTECH LTD
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  • Abstract
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Problems solved by technology

[0005] In the process of large-scale production of reverse osmosis membranes, the polyamide separation layer obtained by interfacial polymerization is very fragile. During the preparation of membrane modules, a harder guide net should be placed in the middle of a softer membrane. It is inevitable that there will be different degrees of scratches on the surface of the membrane, which will lead to a decrease in the desalination rate
During use, particulate impurities in the fluid will also cause mechanical damage and wear to the membrane surface
The traditional method is to coat the surface of the polyamide separation layer with a polyvinyl alcohol solution at room temperature, and dry and solidify at a high temperature, which not only leads to a significant decrease in the water flux through the membrane, but also causes the polyvinyl alcohol to The protective layer is gradually lost, because the polyvinyl alcohol protective layer is not chemically cross-linked, and these problems need to be solved urgently

Method used

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  • Preparation method of multilayer reverse osmosis composite membrane
  • Preparation method of multilayer reverse osmosis composite membrane
  • Preparation method of multilayer reverse osmosis composite membrane

Examples

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preparation example Construction

[0048] The preparation principle of the multilayer reverse osmosis composite membrane is as follows:

[0049] When preparing a multi-layer reverse osmosis composite membrane, first select a fabric or non-fabric that meets the requirements of compressive and tensile strength with a width of 1.06 meters and a thickness of 80 microns as the base layer; A 60-micron-thick solution containing organic polymers or inorganic polymers or organic-inorganic composite materials changes from liquid to solid through solvent exchange or temperature changes or phase changes caused by chemical reactions, forming a transition with ultrafiltration membrane separation performance layer; secondly, on the transition layer, form a dense separation layer that can retain sodium chloride ions as small as sodium chloride ions through an online interface reaction; finally, use photoinitiated polymerization on the separation layer to coat a layer of The protective layer of the structure protects the separa...

Embodiment 1

[0073] Preparation of coating solution (transition layer solution):

[0074] Take 20 parts of chemical reagent AZ and 2 parts of AV and add them to 78 parts of AW under stirring, stir at 110°C for 6 hours until AZ is completely dissolved to form a uniform coating solution, and then cool and degas naturally before use.

[0075] Preparation of base film (transition layer):

[0076] JT-100 multi-purpose automatic film coating machine is used, which is 30 meters long, 6 meters high and 5 meters wide. The above coating solution is evenly coated on the polyester non-woven fabric, and the water phase is used for solvent exchange and then solidified to obtain The polysulfone ultrafiltration membrane with non-woven fabric as the base layer is used as the base membrane of the multi-layer reverse osmosis composite.

[0077] Preparation of the separation layer:

[0078] Take 5 parts of chemical reagent AX, 0.5 part of chemical reagent T, dissolve in 94.5 parts of water to form an aqueou...

Embodiment 2

[0085] The present invention systematically studies and optimizes the influence of the protective layer formed by photoinitiated polymerization on the performance of the film, and the obtained representative results are given in Case 2-10.

[0086] The chemical reagents C, L and V in Table 2, although the absorption wavelengths are different, are all highly efficient ultraviolet photoinitiators, which can be used alone or in combination, and the combined use is often more efficient than the single use. After absorbing ultraviolet radiation energy, free radicals are formed to initiate polymerization, crosslinking and grafting reactions of monomers and oligomers, and the coating is cured to form a three-dimensional network structure in a short time. Unfortunately, the solubility of chemical reagents C, L and V in water is very limited, and it is difficult to prepare an aqueous coating system according to conventional methods. In order to solve the problem of its solubility in wa...

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Abstract

The invention discloses a preparation method of a multilayer reverse osmosis composite membrane. The preparation method comprises the following steps: S1, coating a polyester non-woven fabric with a transition layer solution by using a full-automatic coating machine to form a transition layer on the surface of the polyester non-woven fabric, thereby obtaining a base membrane; S2, immersing the base membrane into an m-phenylenediamine aqueous solution by using the full-automatic coating machine, draining off, and then immersing the base membrane into a 1, 3, 5-trimesoyl chloride solution to form a separation layer on the surface of the base membrane to obtain a permeable membrane without a protective layer, or coating the surface of the base membrane with the 1, 3, 5-trimesoyl chloride solution by using a slit scraper to obtain the permeable membrane without the protective layer; and S3, immersing the permeable membrane without the protective layer into a photoinitiator solution for a certain time, taking out, draining, and carrying out intermittent or continuous irradiation under ultraviolet light to form a protective layer on the surface of the permeable membrane, thereby obtaining the multilayer reverse osmosis composite membrane. The preparation method of the multilayer reverse osmosis composite membrane provided by the invention has the advantages of simple process and mildconditions, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of membrane science and technology, and in particular relates to a preparation method of a multilayer reverse osmosis composite membrane. Background technique [0002] Since the advent of polyamide reverse osmosis composite membranes in 1981, polyamide chemistry has become the symbolic chemical composition of reverse osmosis composite membranes. Although the first patent on polyamide reverse osmosis membrane has passed the protection period, so far, the reverse osmosis composite membrane with polyamide as the core is still the mainstream product, and the research on how to improve it is still very much. active. [0003] In US Pat. No. 9597642B2 issued on March 21, 2017, Koehler et al. described a polyamide-based reverse osmosis composite membrane containing non-metallic additives. This patent systematically describes the effect of non-metallic additives on the performance of polyamide reverse osmosis composite membr...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/12
CPCB01D61/025B01D67/0006B01D69/12
Inventor 汲江
Owner XIAMEN JIANGTIAN MEMBRANE BIOTECH LTD
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