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Preparation method of NCC/ modified konjac glucomannan degradable film

A technology of konjac glucomannan and degradable film, which is applied in the preparation of degradable film and NCC/modified konjac glucomannan degradable film, can solve the problems of low mechanical strength and poor thermal stability, and achieve Good flexibility, high thermal stability, and strong practicability

Inactive Publication Date: 2019-05-21
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems of low mechanical strength and poor thermal stability of konjac glucomannan films in the prior art, and provide a preparation method for NCC / modified konjac glucomannan degradable films

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Hydrolyze the microcrystalline cellulose with sulfuric acid at 40°C, wash the obtained nano-suspension with deionized water until the pH reaches neutral, and centrifuge to obtain the NCC suspension;

[0020] (2) Konjac fine powder is swollen in ethanol solution, adjusted to pH 8, stirred for reaction, dried, and vacuum filtered to obtain konjac glucomannan;

[0021] (3) Put the konjac glucomannan obtained in (2) into an ethanol solution, add chloroacetic acid, adjust the pH value to 8, stir the reaction and dry to obtain modified konjac glucomannan;

[0022] (3) Add the modified konjac glucomannan to distilled water, heat and stir until it swells completely, then slowly add NCC suspension, polyvinyl alcohol, polyethylene glycol and glycerin and stir to obtain a mixed solution, and then add the mixed solution to the colloid Grind evenly in the mill, then add to a homogenizer for homogenization, defoam the homogenized mixed solution to obtain a membrane solution;

[...

Embodiment 2

[0026] (1) Hydrolyze the microcrystalline cellulose with sulfuric acid at 50°C, wash the obtained nano-suspension with deionized water until the pH reaches neutral, and centrifuge to obtain the NCC suspension;

[0027] (2) Konjac fine powder is swollen in ethanol solution, adjusted to pH 9, stirred for reaction, dried, and vacuum filtered to obtain konjac glucomannan;

[0028] (3) Put the konjac glucomannan obtained in (2) into an ethanol solution, add chloroacetic acid, adjust the pH value to 9, stir the reaction and dry to obtain modified konjac glucomannan;

[0029] (3) Add the modified konjac glucomannan to distilled water, heat and stir until it swells completely, then slowly add NCC suspension, polyvinyl alcohol, polyethylene glycol and glycerin and stir to obtain a mixed solution, and then add the mixed solution to the colloid Grind evenly in the mill, then add to a homogenizer for homogenization, defoam the homogenized mixed solution to obtain a membrane solution;

[...

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Abstract

The invention discloses a preparation method of a NCC / modified konjac glucomannan degradable film. A novel compound film material is prepared by adding NCC by taking modified konjac glucomannan as a raw material. The preparation method comprises the following steps: acid hydrolyzing microcrystalline cellulose with sulfuric acid to obtain NCC; modifying konjac glucomannan with chloroacetic acid; mixing the NCC with the modified konjac glucomannan; adding an auxiliary agent; then stirring, glue-milling, homogenizing and defoaming the mixture to obtain a film solution; and pouring the film solution into a grinding apparatus and naturally drying the solution and uncovering the film to obtain the NCC / modified konjac glucomannan degradable film. The film prepared by the invention has the advantages of good flexibility, high mechanical strength, degradability and high thermal stability, is harmless, green and environmentally friendly and is the environment-friendly compound film. The preparation method disclosed by the invention is simple in preparation process, simple to operate, low in cost and high in practicality.

Description

technical field [0001] The invention relates to a preparation method of a degradable film, in particular to a preparation method of an NCC / modified konjac glucomannan degradable film, and belongs to the technical field of composite film materials. Background technique [0002] Konjac glucomannan is a non-ionic water-soluble polymer polysaccharide isolated and extracted from the natural plant konjac corm. The molecule contains glucose and mannose, which are linked by β-1,4-glycosidic bonds. Renewable natural resources, konjac glucomannan has sufficient sources, is biodegradable, has various properties such as hydrophilicity, gelation, and film-forming properties, as well as chemically modifiable functional groups. It can be widely used in food, medicine, chemical industry and biological field. Its hydrosol can be formed into a film under proper conditions, and has a broad prospect of becoming a green packaging film. However, the simple konjac glucomannan film has strong wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/14C08L1/02C08L29/04C08L71/02C08K5/053C08J5/18C08B37/14
Inventor 汤浩其他发明人请求不公开姓名
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD