Method for preparing reverse osmosis membrane
A reverse osmosis membrane and cross-linking reaction technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve PVA coating damage, reverse osmosis membrane water flux decline, loss of protection and anti-pollution, etc. problems, achieve the effect of small water flux, improve mechanical properties, improve water erosion resistance and water dissolution resistance
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Embodiment 1-4
[0032] The degree of polymerization is 1000, the degree of alcoholysis is 99% PVA dissolved in the aqueous solution of 80 ℃, the mass fraction of PVA is 8%, after stirring evenly, add the polyarylate fiber of different fineness (as shown in table 1), The content is 0.01wt%, magnetic stirring and ultrasonic dispersion for 20 minutes, then add 0.6wt% glutaraldehyde and 0.2wt% hydrochloric acid, magnetic stirring and ultrasonic dispersion for 25min. The reaction solution was coated on the polyamide layer of the reverse osmosis membrane prepared in Comparative Example 1, and put into an oven at 100° C. for 10 minutes to react to obtain a reverse osmosis membrane modified by PVA coating containing polyarylate fibers. The desalination rate and water flux of the obtained reverse osmosis membrane were tested, and the test results are shown in Table 1.
[0033] As can be seen from the following table 1, the preferred embodiment in this example is that the degree of polymerization of th...
Embodiment 5-8
[0038] The degree of polymerization is 1000, the degree of alcoholysis is 99% PVA dissolved in the aqueous solution of 80 ℃, the mass fraction of PVA is 8%, after stirring evenly, add the polyarylate fiber of different fineness (as shown in table 2), The content is 0.03wt%, magnetic stirring and ultrasonic dispersion for 20 minutes, then add 0.6wt% glutaraldehyde and 0.2wt% hydrochloric acid, magnetic stirring and ultrasonic dispersion for 25 minutes. The reaction solution was coated on the polyamide layer of the reverse osmosis membrane prepared in Comparative Example 1, and put into an oven at 100° C. for 10 minutes to react to obtain a reverse osmosis membrane modified by PVA coating containing polyarylate fibers. The desalination rate and water flux of the obtained reverse osmosis membrane were tested, and the test results are shown in Table 2.
[0039]As can be seen from the following table 2, the preferred implementation in this example is that the degree of polymerizati...
Embodiment 9-12
[0044] The degree of polymerization is 1000, the degree of alcoholysis is 99% of the PVA dissolved in the aqueous solution of 80 ℃, the mass fraction of PVA is 8%, after stirring evenly, add polyarylate fibers of different fineness (as shown in table 3), The content is 0.05wt%, magnetic stirring and ultrasonic dispersion for 20 minutes, then add 0.6wt% glutaraldehyde and 0.2wt% hydrochloric acid, magnetic stirring and ultrasonic dispersion for 25 minutes. The reaction solution was coated on the polyamide layer of the reverse osmosis membrane prepared in Comparative Example 1, and put into an oven at 100° C. for 10 minutes to react to obtain a reverse osmosis membrane modified by PVA coating containing polyarylate fibers. The desalination rate and water flux of the obtained reverse osmosis membrane were tested, and the test results are shown in Table 3.
[0045] As can be seen from the following table 3, the preferred implementation in this example is that the degree of polymer...
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Abstract
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