Carboxymethyl chitosan potassium zinc bismuth and preparation process and application thereof
A technology of carboxymethyl chitosan bismuth and chitosan, applied in the field of carboxymethyl chitosan bismuth zinc potassium, can solve the problem that the erosion effect is not as good as that of biological macromolecules, achieve good market application prospects, and reduce the risk of drunkenness Possibility, effect of promoting self-repair and healing
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Embodiment 1
[0013] Take by weighing 5g chitosan (deacetylation degree DD=75%), be dissolved in the aqueous solution of the formic acid of 500mL1% (mass percentage concentration, the same below), filter out the insoluble matter, slowly add dropwise the Zinc chloride aqueous solution 80ml, after stirring at room temperature for 2 hours, adjust the pH to 6.0 with dilute ammonia water, continue the reaction for 2 hours, precipitate with ethanol, wash, dehydrate, and then vacuum-dry to obtain a white solid of chitosan-zinc complex. Weigh 5g of the solid into the reactor, add 40mL12moL·L -1 Potassium hydroxide aqueous solution and 50mL ethanol were swelled overnight, then 12g chloroacetic acid was dissolved in 10mL ethanol and slowly added dropwise, after the dropwise addition was completed, the reaction was kept at 55°C for 4 hours, after filtration, washed repeatedly with 70% ethanol aqueous solution, and then washed with Dehydration with water and ethanol, and vacuum drying to obtain zinc po...
Embodiment 2
[0015] Weigh 5g of chitosan (deacetylation degree DD=87%), dissolve in 500mL of 1% formic acid aqueous solution, filter out the insoluble matter, slowly add 100ml of zinc sulfate aqueous solution containing 2g of zinc dropwise under stirring, and react for 3h under stirring at room temperature Finally, adjust the pH to 6.0 with dilute KOH aqueous solution, continue the reaction for 3 hours, precipitate with acetone, wash, dehydrate, and then vacuum-dry to obtain a white solid of chitosan-zinc complex. Weigh 5g of the solid into the reactor, add 50mL 10moL·L -1 Potassium hydroxide aqueous solution and 50mL isopropanol were swelled overnight, then 14g chloroacetic acid was dissolved in 10mL isopropanol and slowly added dropwise, after the dropwise addition was completed, the reaction was kept at 65°C for 2.5h, and after filtration, repeated with 70% ethanol aqueous solution Washing, dehydration with acetone, and vacuum drying to obtain zinc potassium carboxymethyl chitosan. Wei...
Embodiment 3
[0017] Weigh 5g of chitosan (deacetylation degree DD=96%), dissolve in 500mL of 1% formic acid solution, filter out the insoluble matter, slowly add 60ml of zinc acetate aqueous solution containing 1g of zinc dropwise under stirring, and react for 2h under stirring at room temperature Finally, adjust the pH to 6.0 with dilute KOH aqueous solution, continue the reaction for 3 h, precipitate with acetone, wash, dehydrate, and then vacuum-dry to obtain a white solid of chitosan-zinc complex. Weigh 5g of the solid into the reactor, add 60mL 12moL·L -1 Potassium hydroxide aqueous solution and 50mL isopropanol were swelled overnight, then 16g of chloroacetic acid was dissolved in 10mL isopropanol and slowly added dropwise, after the dropwise addition was completed, the reaction was kept at 60°C for 3h, and after filtration, it was washed repeatedly with 70% ethanol aqueous solution , and then dehydrated with acetone, and vacuum-dried to obtain carboxymethyl chitosan zinc potassium. ...
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