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Preparation method of electrically neutral polyamide composite reverse osmosis membrane material

A technology of reverse osmosis membrane and polyamide, which is applied in the field of preparation of electrically neutral polyamide composite reverse osmosis membrane materials, can solve the problems of functional layer defects, reducing membrane separation performance, reducing membrane surface zeta potential value, etc.

Active Publication Date: 2021-04-16
湖南澳维新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN102974221B discloses a method for controlling the surface potential of a reverse osmosis membrane. NaClO solution is used to oxidize the reverse osmosis membrane to reduce the zeta potential value of the membrane surface; this treatment method can change the charge state of the membrane surface, but because active chlorine also destroys the amide The main substance of the bond will cause defects in the functional layer and reduce the separation performance of the membrane
This treatment method can remove the residual functional monomers on the surface of the reverse osmosis membrane, but does not change the state of charge on the functional layer on the surface of the membrane.

Method used

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  • Preparation method of electrically neutral polyamide composite reverse osmosis membrane material
  • Preparation method of electrically neutral polyamide composite reverse osmosis membrane material
  • Preparation method of electrically neutral polyamide composite reverse osmosis membrane material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] An electrically neutral polyamide composite reverse osmosis membrane, its preparation method specifically comprises the following steps:

[0031] Step 1: Polyamide composite reverse osmosis membrane A is obtained by interfacial polymerization reaction between m-phenylenediamine and trimesoyl chloride. Specifically, the surface of the polysulfone membrane is repeatedly washed with deionized water, and then the membrane surface is purged with nitrogen until there is no liquid. drop; preparation containing mass concentration is 3.5% m-phenylenediamine, mass concentration is 2.5% triethylamine, mass concentration is 2% camphorsulfonic acid and mass concentration is the water of 1% sodium dodecylsulfonate phase solution, contact the polysulfone membrane surface with the above water phase solution for 20s, and then purge the membrane surface with nitrogen until there are no droplets; prepare a n-hexane solution containing 0.2% trimesoyl chloride (i.e. oil phase solution) , th...

Embodiment 2-7 and comparative example 2-4

[0039] The parameter statistics of Examples 1-7 and Comparative Examples 1-4 are detailed in Table 1 (other contents not mentioned in Examples 2-7 and Comparative Examples 2-3 are the same as those in Example 1):

[0040] Table 1 The parameter statistical table of embodiment 1-7 and comparative example 1-4

[0041]

[0042] in:

[0043] Comparing Example 2 with Example 1, only the mass fraction and temperature of THF in Step 3 are different (THF is 6%, and the temperature is 55° C.), and the others are the same as Example 1.

[0044] Embodiment 3-4 is compared with embodiment 1, only the mass fraction of tetrahydrofuran in the step 3 is different, others are the same as embodiment 1.

[0045] Embodiment 5 is compared with embodiment 1, only the cleaning activator in the step 3 adopts p-hydroxybenzoic acid, and others are the same as embodiment 1.

[0046] Embodiment 6 is compared with embodiment 1, only the cleaning activator in step 3 adopts aminopropylene glycol, and ot...

Embodiment 8

[0048] Comparing Example 8 with Example 1, the only difference lies in step 3: immerse polyamide composite reverse osmosis membrane A in an oxalic acid aqueous solution with a mass fraction of 8% and wash at 75°C for 2 minutes to obtain polyamide composite reverse osmosis membrane B; Sweep away the water droplets on the surface and immerse in an aqueous solution containing 2% p-hydroxybenzoic acid and 8% pyridine at 55°C for 3.5 minutes to obtain a polyamide composite reverse osmosis membrane C; immerse in a water bath for 3 minutes , after purging to dry the water droplets on the surface, immerse in 8% glycerol aqueous solution for 1 min, and dry in an oven at 65°C to obtain an electrically neutral polyamide composite reverse osmosis membrane.

[0049] The difference between Comparative Example 2 and Example 1 lies in the amount of tetrahydrofuran (5%), and the others are the same as Example 1.

[0050] The difference between Comparative Examples 3-4 and Example 1 lies in the...

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Abstract

The invention discloses a preparation method of an electrically neutral polyamide composite reverse osmosis membrane material. The preparation method specifically comprises the following steps: step 1, carrying out interfacial polymerization to form a polyamide composite reverse osmosis membrane A; 2, carrying out monomer cleaning on the polyamide composite reverse osmosis membrane A to obtain a polyamide composite reverse osmosis membrane B; 3, treating the polyamide composite reverse osmosis membrane B with a cleaning activator to obtain a polyamide composite reverse osmosis membrane C, wherein the cleaning activator comprises a functional reagent; and 4, carrying out post-treatment on the polyamide composite reverse osmosis membrane C to obtain the electrically neutral polyamide composite reverse osmosis membrane. The preparation method of the electrically neutral polyamide composite reverse osmosis membrane material has the characteristics that the charge state of the surface of the membrane can be effectively changed; the prepared membrane material keeps a relatively high desalination rate, and the water yield is greatly improved; the anti-pollution performance of the membrane material can be improved; and the preparation method is simple and easy to operate, the process is controllable, and industrial large-scale production can be realized.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to a preparation method of an electrically neutral polyamide composite reverse osmosis membrane material. Background technique [0002] Reverse osmosis membrane is the core of reverse osmosis technology, and the most widely used membrane material is polyamide composite reverse osmosis membrane. The surface of the existing polyamide reverse osmosis membrane usually has a lot of negative charges. When treating sewage, the surface of the membrane is easy to absorb cationic surfactants, causing fouling of the membrane material, greatly reducing the water production of the membrane, and it is difficult to pass chemical Clean for recovery. [0003] In the prior art, there are some post-treatment methods for reverse osmosis membrane materials: [0004] CN102974221B discloses a method for controlling the surface potential of a reverse osmosis membrane. NaClO solution is ...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D69/02B01D67/00
Inventor 彭军贺妍博
Owner 湖南澳维新材料技术有限公司
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