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A kind of processing method of sodium carboxymethyl cellulose toughening thermoplastic chitosan

A technology of sodium carboxymethyl cellulose and a processing method, applied in the field of thermoplastic processing, can solve the problems of high brittleness and no application value of materials, and achieve the effect of improving breaking strength and elongation at break

Active Publication Date: 2021-10-29
WUHAN ENG SCI & TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can conveniently and effectively prepare thermoplastic chitosan, in the process of processing, due to the degradation of chitosan molecular chains and other reasons, the obtained material is relatively brittle and has no application value.

Method used

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  • A kind of processing method of sodium carboxymethyl cellulose toughening thermoplastic chitosan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Chitosan (CS) with a weight average molecular weight of about 50,000 and a degree of deacetylation of 85% was mixed with a viscosity of

[0019] 300-800mpa.s sodium carboxymethylcellulose (CMC) is mixed, sodium carboxymethylcellulose accounts for 1% of the total weight of sodium carboxymethylcellulose and chitosan, and then mixed with an aqueous hydrochloric acid solution with a mass fraction of 8% Mix evenly, pour it into an internal mixer, and react at 80°C for 10 minutes to obtain thermoplastic chitosan, which is designated as CC300-1.

Embodiment 2～4

[0021] Preparation method is identical with embodiment 1, and difference is that sodium carboxymethyl cellulose accounts for the ratio of sodium carboxymethyl cellulose and chitosan gross weight and improves to 3%, 5% and 10%, gained thermoplastic chitosan They are recorded as CC300-3, CC300-5 and CC300-10 respectively.

Embodiment 5～12

[0023] The preparation method is the same as in Example 1, except that the viscosity of sodium carboxymethyl cellulose is changed, and sodium carboxymethyl cellulose with a viscosity range of 800-1200mpa.s and 1000-1400mpa.s accounts for 1%, 3%, 5% and 10% of chitosan composite materials prepared under the conditions, the resulting thermoplastic chitosan composite materials were recorded as CC800-1, CC800-3, CC800-5, CC800-10, CC1000-1, CC1000- 3, CC1000-5 and CC1000-10.

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Abstract

The invention relates to a novel thermoplastic processing method for toughening chitosan materials. A processing method for melt-toughened thermoplastic chitosan, comprising uniformly mixing chitosan, acid solution, and sodium carboxymethyl cellulose and kneading in an internal mixer to obtain thermoplastic chitosan that can be directly processed by secondary molding A sugar / sodium carboxymethyl cellulose composite material, wherein the mass ratio of chitosan to sodium carboxymethyl cellulose is 1: (0.01-0.1), and the acid solution is an acid solution capable of dissolving chitosan. When chitosan and sodium carboxymethyl cellulose are blended, a certain mass fraction and molecular weight of carboxymethyl cellulose can improve the breaking strength and breaking elongation of chitosan membrane materials.

Description

technical field [0001] The invention relates to a novel thermoplastic processing method for toughening chitosan materials. Background technique [0002] Chitosan is the product of deacetylation of chitin and is the only alkaline polysaccharide in nature. The amino group on the chitosan molecule can combine with some positive ions, so it has a wide range of applications in metal ion adsorption and antibacterial. [0003] The current method used to prepare chitosan membrane materials is the solution method. This method requires the use of a large amount of solvent, and the subsequent separation and purification are complicated. The properties of the obtained material are also affected by factors such as the solvent volatilization rate, so it is not suitable for industrial production. Melt processing is an ideal polymer material processing method, and it is also suitable for the industrial preparation of materials. However, pure chitosan molecules have strong molecular hydrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/08C08L1/28
CPCC08L5/08C08L1/286
Inventor 张宇
Owner WUHAN ENG SCI & TECH RESINST