Chitosan graft hyperbranched polymer polyamidoamine, its preparation method and application
A technology of hyperbranched polymers and polyamidoamines, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve problems such as low scale inhibition efficiency and phosphorus pollution, and achieve good results Antibacterial effect, easy biodegradation, obvious effect of environmental performance
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Embodiment 1
[0057] Add acrylic acid into water and stir well; add NaOH in the amount of acrylic acid and other substances into water, stir to dissolve it completely; slowly add NaOH solution into the aqueous solution of acrylic acid, adjust the pH value to 6; according to the molar ratio of chitosan and acrylic acid 1:4, mix chitosan with the above-mentioned solution, control the temperature at 80°C, 85°C, 90°C, 95°C, 100°C, and react for 5 hours at pH 6; after the reaction, adjust the reaction with NaOH solution The pH of the solution is about 10, and then centrifuged to collect the supernatant; slowly add 95% ethanol with a concentration of 2 times the volume of the clear solution to the separated clear solution under stirring, so that the product is fully precipitated, and then carried out Washing; add absolute ethanol to wash, drain, and vacuum dry at 70-80°C to obtain carboxyethyl chitosan. The degree of substitution and yield of carboxyethyl chitosan are shown in the table below.
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Embodiment 2
[0061] Add acrylic acid into water and stir well; add NaOH in the amount of acrylic acid and other substances into water, stir to dissolve it completely; slowly add NaOH solution into the aqueous solution of acrylic acid, adjust the pH value to 6; according to the molar ratio of chitosan and acrylic acid 1:4, mix chitosan with the above-mentioned solution, control the temperature at 90°C, the time is 3h, 4h, 5h, 6h, 7h, and react at pH 6; after the reaction, adjust the pH of the reaction solution with NaOH solution to about 10, then centrifuged to collect the supernatant; slowly add 2 times the volume of ethanol with a concentration of 95% to the separated supernatant under stirring, so that the product is fully precipitated, and then washed; add Wash with absolute ethanol, drain, and vacuum dry at 70-80°C to obtain carboxyethyl chitosan. The degree of substitution and yield of carboxyethyl chitosan are shown in the table below.
[0062] Table 3 Effect of reaction time of car...
Embodiment 3
[0065] Add acrylic acid into water and stir well; add NaOH in the amount of acrylic acid and other substances into water, and stir to dissolve it completely; slowly add NaOH solution into the aqueous solution of acrylic acid, and adjust the pH to 6; Ratio 1:3, 1:3.5, 1:4, 1:4.5, 1:5, mix chitosan with the aforementioned solution, control the temperature at 90°C, the time is 5h, the pH value is 6, and react; after the reaction Use NaOH solution to adjust the pH of the reaction solution to about 10, then centrifuge to collect the supernatant; slowly add 2 times the volume of the clear liquid to the separated clear liquid under stirring. Slowly add 95% ethanol to make the product fully The precipitate is precipitated, and then washed; adding absolute ethanol to wash, draining, and vacuum drying at 70-80°C to obtain carboxyethyl chitosan. The degree of substitution and yield of carboxyethyl chitosan are shown in the table below.
[0066] Table 4 Effect of reactant ratio of carbox...
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