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Prepn. process of intermingled chitin/cellulose material in sodium hydroxide/urea water solution system

A sodium hydroxide and chitin technology, applied in the fields of natural polymers and biomedicine, can solve the problems of high cost of chitin and cellulose blend materials, environmental pollution, human harm and other problems, and achieve good biocompatibility, scientific and technological progress. The effect of high content and easy processing

Inactive Publication Date: 2003-01-08
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The patent application with Chinese patent application number 01106676.8 proposes a chitin and cellulose blend material and its preparation method and application. Since the blend material generates hydrogen sulfide gas during the preparation process, the release of the gas not only pollutes the environment , and harmful to human
In addition, the cost of preparing chitin and cellulose blend materials by this method is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Get 160g regenerated cellulose and fully swell in metered 6% (wt) NaOH and 4% (wt) urea mixed solution, thaw after freezing at -10 ℃ for 24 hours, filter, and make 3.5% (wt) Cellulose solution.

[0017] Add 160g of chitin powder to 616mL of 46% (wt) NaOH solution, swell in an ice bath for 6 hours, add metered crushed ice, freeze at -10°C for 24 hours after stirring, thaw and filter to obtain 3.5% ( wt) chitin solution.

[0018] Mix the above-mentioned chitin aqueous solution and cellulose aqueous solution according to different proportions, degas after fully stirring, scrape the film on a glass plate, the film thickness is about 0.2-0.3mm, and then immerse in 0.5-20% (wt) chlorine Coagulate in calcium chloride aqueous solution for 30 minutes, regenerate in 0.5-25% (wt) sulfuric acid aqueous solution or 0.1-10% (wt) hydrochloric acid aqueous solution for 5 minutes, wash with water and dry at room temperature to obtain a colorless and transparent film.

Embodiment 2

[0019] Example 2: Repeat the above dissolution process to prepare a blend of 3.5% (wt) chitin solution and 3.5% (wt) cellulose solution. The film is directly immersed in 0.5-25% (wt) sulfuric acid aqueous solution or 0.1-10% (wt) hydrochloric acid aqueous solution for regeneration for 5 minutes, washed with water and dried at room temperature to obtain a colorless and transparent film.

Embodiment 3

[0020] Embodiment 3: with reference to the method of embodiment 1 or 2, can make the aqueous alkali solution of 0.5~10% chitin and the NaOH / urea aqueous solution of 0.5~10% cellulose, according to different proportioning ratio 1: 0.5 to 1 : 20 by weight ratio, stirring, filtering, and degassing to obtain a blended slurry, and then obtaining blended films or fibers with different chitin contents through film scraping or spinning.

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PUM

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Abstract

The invention discloses a method of using the system of the sodium hydroxide / the carbamide to prepare the commixed materials of the crust element and the fibrin, and the method is as follows: using the water solution of the NaOH / the carbamide to be the solvent, commix the crust element and the fibrin according to different make-up proportion, then perform scraping film or spraying thread on the commixture, then make the film or the thread of the commixture solidify in the calcium chloride solution, and then make the crust element and the fibrin regenerate to get the above commixed materials. The method can prepare the film and thread by directly using the crust element to commix, the film and the thread have fine mechanical property, water resistance and anti-cruor capability, the have avirulence, innocuity, high security and biological degradability.

Description

technical field [0001] The invention relates to a method for preparing a chitin and cellulose blend material in a sodium hydroxide / urea water system, which belongs to the field of natural polymers and also belongs to the field of biomedicine. Background technique [0002] Chitin is a linear polymer composed of 2-acetylamino-2-deoxy-D-glucopyranose monomers linked by β-(1→4). Because of its good biological activity, antibacterial and anti-inflammatory, biocompatibility, adsorption, ion exchange and biodegradability, chitin and its derivatives have been widely used in biomedicine, papermaking, textiles, optical materials, heavy metal chelating agents, hollow fibers etc. (J.D.Rathke, S.M.Hudson, J.Macromol.Sci.: Rev.Macromol.Chem.Phys., 1994, C34(3), 375; R.A.A.Muzzarelli, Chitin In: Naturally Chelating Polymers, New York: Pergaman Press, 1977 ). Simultaneously, they can also be used as anticoagulant, bandage, surgical suture thread, dressing tape, artificial bone and artific...

Claims

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Application Information

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IPC IPC(8): C08L1/00C08L5/08
Inventor 周金平张俐娜杜予民郑化
Owner WUHAN UNIV
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