Method for preparing super absorbent polymer (SAP) from carboxymethylcellulose (CMC) and maleic acid (MA)
A technology of carboxymethyl cellulose and water-absorbent resin, applied in the field of preparation of water-absorbent resin, can solve the problems of poor temperature resistance, high price, single raw material and the like
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[0012] The present invention is further described and illustrated below through specific embodiments:
[0013] Accurately weigh 6g of acrylamide and place it in a 250mL three-neck flask, stir well to disperse it evenly; weigh 3g of maleic acid, prepare a solution, add 25% NaOH solution to adjust the neutralization degree of maleic acid (N) 80%; weigh 1g carboxymethyl cellulose and swell it with distilled water; mix the three monomers in a 250mL three-necked flask, add quantitative distilled water to make w(CMC+MA+AM)=20% (based on the mass of the system) ; Then add 0.1% mass fraction of crosslinking agent N,N'-methylbisacrylamide solution, heat to 50 ° C for 10 minutes, then dropwise add 0.2% mass fraction of initiator ammonium persulfate-sodium bisulfite solution, Continue to stir until the mixture is uniform; feed nitrogen to maintain a constant temperature of 50°C for reaction. React for 5 hours to obtain a colorless and transparent colloid; place the colloid in a vacuum o...
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