Preparation method of glycine betaine colloid nano particle modified chitosan nanofiltration membrane
A nanoparticle and betaine technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems that restrict long-term stable work, nanofiltration membrane pollution, etc., achieve good industrial applicability, low cost, Simple and safe preparation process
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[0016] The steps of the preparation method of betaine colloidal nanoparticles modified chitosan nanofiltration membrane are as follows:
[0017] 1) Prepare betaine colloidal nanoparticles by using betaine olefin monomer and hydroxyalkyl acrylate monomer as functional monomers, making an aqueous solution, adding a water-soluble oxidation-reduction initiator, and adopting a soap-free emulsion polymerization method;
[0018] 2) Uniformly disperse chitosan and betaine colloidal nanoparticles in an aqueous solution containing inorganic acid, add a cross-linking agent, and make a casting solution; o Under the condition of temperature of C and relative air humidity of 50-60%, the above-mentioned casting solution is evenly coated on the polysulfone ultrafiltration membrane, and placed at 40-60 o In the baking oven of C for 2~4 hours, obtain betaine colloidal nanoparticles modified chitosan nanofiltration membrane;
[0019] Step 1) The betaine-based olefin monomer is 3-[N,N-dimethyl-[...
Embodiment 1
[0026] Take 15g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 5g of hydroxyethyl acrylate In 100ml of water, nitrogen gas was introduced, and potassium persulfate and sodium bisulfite (mass ratio 1:1) were added with a concentration of 1% by mass percentage, at 30 o Carry out soap-free emulsion polymerization under C for 6 hours, after repeated centrifugation, washing, and vacuum drying, obtain betaine colloidal nanoparticles; 0.1g of the above nanoparticles, 0.5 g chitosan (molecular weight 50,000, deacetylation degree 85%) ), 0.1g of hydrochloric acid and 0.2g of glutaraldehyde were added to 100 ml of water and dissolved to obtain a clear and transparent casting solution; at 20 o C and 50% air relative humidity conditions, the above-mentioned casting solution is evenly coated on the polysulfone ultrafiltration membrane, and then it is placed in 40 o In the baking oven of C for 4 hours, obtain betaine colloidal nanoparti...
Embodiment 2
[0028] Take 35g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 15g of hydroxyethyl acrylate and add In 100ml of water, nitrogen gas was introduced, and potassium persulfate and sodium bisulfite (mass ratio 1:1) were added with a mass percent concentration of 3%, at 50 o Soap-free emulsion polymerization was carried out at C for 2 hours, after repeated centrifugation, water washing, and vacuum drying, betaine colloidal nanoparticles were obtained; 1 g of the above nanoparticles, 2 g of chitosan (molecular weight: 200,000, deacetylation degree: 95%) , 0.3g hydrochloric acid and 0.5g glutaraldehyde were added into 100 ml of water and dissolved to obtain a clear and transparent casting solution; at 30 o C and 60% air relative humidity conditions, the above-mentioned casting solution is evenly coated on the polysulfone ultrafiltration membrane, and then it is placed in 60 o C in the oven for 2 hours to obtain the betaine colloi...
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