Hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent and preparation method thereof
A carboxymethyl cellulose, anion technology, applied in the direction of flocculation / sedimentation water / sewage treatment, etc., can solve the problems of low molecular weight, sensitive flocculation effect, etc. Effect
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[0033] Example 1:
[0034] Dissolve carboxymethyl cellulose (anion substitution degree of about 80%, weight average molecular weight of about 150,000) in pure water to prepare a 0.5% solution of carboxymethyl cellulose. After the solution is uniform, add ammonium persulfate as initiator (Additional amount is 2% of the moles of carboxymethyl cellulose unit), then add acrylamide (mass ratio to carboxymethyl cellulose: 5:1), react at 45°C for 3 hours, then use acetone as precipitation The product is separated by precipitation to obtain grafted carboxymethyl cellulose. Disperse the grafted carboxymethyl cellulose in a mixed solvent of water and ethanol (the mass ratio of water to ethanol is 1:6, and the mass percentage of the grafted carboxymethyl cellulose in the mixed solvent is 1%), add Sodium hydroxide (the mass percentage of sodium hydroxide in the mixed solvent is 2%), react at 55°C for 3 hours, filter and dry after the reaction, to prepare a hydrolyzed grafted enhanced anioni...
Example Embodiment
[0035] Example 2:
[0036] Dissolve carboxymethyl cellulose (anion substitution degree of about 90%, weight average molecular weight of about 250,000) in pure water to prepare a 0.1% solution of carboxymethyl cellulose. After the solution is uniform, add ammonium persulfate as initiator (Addition amount is 3% of carboxymethyl cellulose unit moles), then add acrylamide (to carboxymethyl cellulose mass ratio: 2:1), react at 55℃ for 2 hours, then use acetone as precipitation The product is separated by precipitation to obtain grafted carboxymethyl cellulose. Disperse grafted carboxymethyl cellulose in a mixed solvent of water and ethanol (the mass ratio of water to ethanol is 1:2, and the mass percentage of grafted carboxymethyl cellulose in the mixed solvent is 10%), add Sodium hydroxide (the mass percentage of sodium hydroxide in the mixed solvent is 8%), react at 60°C for 0.1 hours, filter and dry after the reaction, to prepare a hydrolyzed grafted enhanced anionic carboxymethyl...
Example Embodiment
[0037] Example 3:
[0038] Dissolve carboxymethyl cellulose (anion substitution degree about 85%, weight average molecular weight about 400,000) in pure water to prepare a 3% solution of carboxymethyl cellulose. After the solution is uniform, add potassium persulfate as a trigger (Additional amount is 1% of the mole number of carboxymethylcellulose unit), then add acrylamide (mass ratio to carboxymethylcellulose: 6:1), react at 50℃ for 2 hours, and then use ethanol as precipitation The product is separated by precipitation to obtain grafted carboxymethyl cellulose. Disperse the grafted carboxymethyl cellulose in a mixed solvent of water and ethanol (the mass ratio of water to ethanol is 1:10, and the mass percentage of grafted carboxymethyl cellulose in the mixed solvent is 5%), add Sodium hydroxide (the mass percentage of sodium hydroxide in the mixed solvent is 5%), react at 35°C for 5 hours, filter and dry after the reaction, to prepare a hydrolyzed grafted enhanced anionic c...
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