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Acrylamide chitin and preparation method thereof

A technology of acrylamide and chitin, applied in the field of material science, can solve the problems of large environmental pollution and serious molecular weight degradation of products, and achieve the effects of simple and easy operation, high substitution degree and high yield.

Inactive Publication Date: 2013-07-31
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the synthesis of acrylamide chitin is prepared by using the activity of the hydroxyl group on the 6-position of chitin and the propenyl group through grafting reaction. The intermediate used is generally acrylamide, with persulfate as the initiator, and the reaction medium is alkaline isopropyl Alcohol, high concentration of alkali, the molecular weight of the prepared product is seriously degraded, organic reagents are used in the reaction process, and the environment is polluted

Method used

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  • Acrylamide chitin and preparation method thereof
  • Acrylamide chitin and preparation method thereof
  • Acrylamide chitin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 0.25g chitin to 49.75g NaOH and CO(NH 2 ) 2 In the mixed solution, the mass percentage of NaOH is 6%, CO(NH 2 ) 2 The mass percentage of chitin is 2%, and it is frozen at -18°C for 24 hours. After thorough stirring, a chitin solution with a mass percentage concentration of 0.5% is prepared. According to the chitin monomer to acrylamide molar ratio of 1:5, add 0.438g acrylamide to the chitin solution, and stir at 0°C for 36 hours, adjust the pH value of the chitin solution to neutral with 1mol / L hydrochloric acid , the neutral chitin solution was dialyzed in distilled water for 7 days until the sodium chloride was completely removed, and the liquid obtained after dialysis was dried by freeze-drying to obtain spongy acrylamide chitin.

Embodiment 2

[0033] Add 1g of chitin to 49g of NaOH and CO(NH 2 ) 2 In the mixed solution, the mass percentage of NaOH is 8%, CO(NH 2 ) 2 The mass percentage of chitin is 4%, and it is frozen at -22°C for 18 hours, and after thorough stirring, a chitin solution with a mass percentage concentration of 2% is prepared. According to the chitin monomer to acrylamide molar ratio of 1:9, add 3.148g acrylamide to the chitin solution, and stir at 15°C for 24 hours, adjust the pH value of the chitin solution to neutral with 1mol / L hydrochloric acid , the neutral chitin solution was dialyzed in distilled water for 7 days until the sodium chloride was completely removed, and the liquid obtained after dialysis was dried by freeze-drying to obtain spongy acrylamide chitin. figure 1 In (b) curve and figure 2 The curves in (a) are the infrared spectrum and nuclear magnetic resonance spectrum of the acrylamide chitin obtained in this example, respectively.

[0034] From figure 1 In (b), it can be se...

Embodiment 3

[0038] Add 1g of chitin to 49g of NaOH and CO(NH 2 ) 2 In the mixed solution, the mass percentage of NaOH is 8%, CO(NH 2 ) 2 The mass percentage of chitin is 4%, and it is frozen at -22°C for 18 hours, and after thorough stirring, a chitin solution with a mass percentage concentration of 2% is prepared. According to the chitin monomer to acrylamide molar ratio of 1:7, add 2.448g acrylamide to the chitin solution, and stir at 15°C for 24 hours, adjust the pH value of the chitin solution to neutral with 1mol / L hydrochloric acid , the neutral chitin solution was dialyzed in distilled water for 7 days until the sodium chloride was completely removed, and the liquid obtained after dialysis was dried by freeze-drying to obtain spongy acrylamide chitin.

[0039] Dissolve the acrylamide chitin obtained in this example in water to obtain an acrylamide chitin solution with a mass percentage concentration of 1%, and adjust the pH value of the acrylamide chitin solution to 7.4, and test ...

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Abstract

The invention discloses acrylamide chitin and a preparation method thereof. The method comprises the steps that: (1) chitin is dissolved in a mixed solution of NaOH and CO(NH2)2, such that a chitin solution is obtained; (2) acrylamide is added into the chitin solution; the mixture is mixed for 16-36h under a temperature of 0-20 DEG C; and the pH value of the chitin solution is regulated to that of neutral by using dilute hydrochloric acid, wherein the molar ratio of chitin monomer to acrylamide is 1:5-1:20; and (3) the neutral chitin solution is dialyzed until sodium chloride is completely removed; and liquid obtained by dialysis is dried, such that spongy acrylamide chitin is obtained. The method provided by the invention has the advantages of mild reaction, low damage to chitin molecules, and high product substitution degree. The obtained acrylamide chitin has pH value and metal ion sensitivities, and can be used in the fields such as cosmetics, textile, agriculture, food processing, pharmaceuticals, environmental protection, and the like.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to an acrylamide chitin and a preparation method thereof. Background technique [0002] Chitin, also known as chitin, chitin, shell protein, chitin, polyacetylglucosamine, chemical name (1,4)-2-acetylamino-2-deoxy-β-D-glucan , is a linear biopolymer linked by β-1,4 glycosidic bonds, and is the second largest renewable natural polymer material after cellulose. However, chitin is insoluble in common solvents due to intramolecular and intermolecular hydrogen bonds, which largely limits the further application of chitin. [0003] Acrylamide chitin is a water-soluble anionic polymer with carboxyl and amide groups in its molecular structure. It has pH sensitivity, metal ion sensitivity, good biocompatibility, biodegradability, adsorption and flocculation, moisture absorption and moisturizing It is widely used in medicine, cosmetics, agriculture, food processing, textiles, env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08A61K47/36
Inventor 施晓文丁福源杜予民
Owner WUHAN UNIV