A kind of preparation method of azobenzene-containing polyamide reverse osmosis composite membrane
A reverse osmosis composite membrane, nitrogen benzene polyamide technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology and other directions, to achieve the effects of good mechanical strength, strong anti-pollution performance, high salt rejection and water flux
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Embodiment 1
[0041] A production method of azobenzene-containing polyamide reverse osmosis composite membrane, comprising the following steps:
[0042] (1) Synthesis of p-aminoazobenzene derivatives (A)
[0043] Take 5.5g (0.04mol) p-nitroaniline, add 16g (0.16mol) concentrated HCl and 20gH 2 0, heated to dissolve under stirring, and then cooled in an ice-water bath to precipitate fine crystals of hydrochloride. Take another 3.3g (0.048mol) sodium nitrite, add 18gH 2 0 to form a solution, quickly added dropwise to the above hydrochloride, and reacted for 30 min under vigorous stirring. Use starch-potassium iodide test paper to check whether the reaction is complete, and use urea to remove excess nitrous acid generated in the reaction. The reaction solution was filtered to obtain a clear yellow filtrate which was the diazonium salt solution of p-nitroaniline.
[0044] Take 8.3g (0.048mol) of p-aminobenzenesulfonic acid and 1.0g (0.01mol) of concentrated hydrochloric acid, add 30g of H2O...
Embodiment 2
[0063] A production method of azobenzene-containing polyamide reverse osmosis composite membrane, comprising the following steps:
[0064] (1) Synthesis of p-aminoazobenzene derivatives (A)
[0065] In step (1) of Example 1, 5.5g (0.04mol) of p-nitroaniline was replaced by 9.2g (0.04mol) of sodium p-aminobenzenesulfonate, and the rest were the same as in Example 1. The resulting product is p-aminoazosulfonic acid benzene (A2).
[0066] (2) Synthesis of side chain type azoamide functional monomer (B)
[0067] Replace 9.7g (0.04mol) of product A1 in step (2) of Example 1 with 13.5g (0.04mol) of product A2, and the rest are the same as in Example 1. The resulting product is methacrylamide azosulfonic acid benzene (B2).
[0068] (3) Synthesis of azoamide homopolymer (C) with terminal ω-halogen group
[0069] 31.1 g (0.1 mol) of product B1 in step (3) of Example 1 was replaced with 40.5 g (0.1 mol) of product B2, and the rest were the same as in Example 1. The resulting produc...
Embodiment 3
[0073] A production method of azobenzene-containing polyamide reverse osmosis composite membrane, comprising the following steps:
[0074] (1) Synthesis of p-aminoazobenzene derivatives (A)
[0075] In the step (1) of Example 1, p-nitroaniline is replaced by p-aminobenzoic acid, and the rest are the same as in Example 1. The product obtained is p-aminoazocarboxybenzene (A 3 ).
[0076] (2) Synthesis of side chain type azoamide functional monomer (B)
[0077] With embodiment 1. The resulting product is methacrylamide azocarboxybenzene (B 3 ).
[0078] (3) Synthesis of azoamide homopolymer (C) with terminal ω-halogen group
[0079] With embodiment 1. The resulting product is the end group containing ω-halogen group azoamide homopolymer (C 3 ).
[0080] (4) Synthesis of azobenzene & MMA block copolymer (D)
[0081] With embodiment 1.
[0082] (5) Synthesis of Chain Anion / Cation Azoamide Homopolymer (E)
[0083] The 40g phenol in embodiment 1 is replaced with 92g sodiu...
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