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Preparation method of regenerated cellulose reinforced starch film

A technology of regenerated cellulose and cellulose, which is applied in the field of preparation of new regenerated cellulose-reinforced starch composite materials, can solve the problems of cumbersome preparation of raw material microcrystalline cellulose, performance dependence on reaction conditions, etc., and achieve cost reduction and simple preparation process Effect

Inactive Publication Date: 2014-08-06
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are not only cumbersome to prepare the raw material microcrystalline cellulose, but also the final properties are strongly dependent on the reaction conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add a certain amount of cotton linters (polymerization degree 1000) into the NaOH / urea aqueous solution and mix thoroughly, wherein the mass ratio of NaOH, urea and distilled water is 7:12:81, the ratio of linter pulp to NaOH / urea aqueous solution The mass ratio is 1:99. The mixture was frozen at -12°C for 5 h, and a transparent solution was obtained after thawing. Add distilled water to the transparent solution to form white flocs, and the volume ratio of distilled water to transparent solution is 10:1. A white gel was obtained by centrifugation, washed with deionized water until neutral, and regenerated cellulose was obtained after centrifugation. The mixture of starch, glycerol and distilled water was heated to 100°C and stirred for 20 minutes to obtain a colorless transparent viscous solution, in which the mass fractions of starch, glycerol and distilled water were 7 wt%, 3 wt% and 90 wt%, respectively. Add the regenerated cellulose into the starch / glycerin / distil...

Embodiment 2

[0023] Add a certain amount of microcrystalline cellulose (polymerization degree 220) into the LiOH / thiourea aqueous solution and mix thoroughly, wherein the mass ratio of LiOH, thiourea and distilled water is 9.5:4.5:86, and the microcrystalline cellulose and LiOH / thiourea The mass ratio of the aqueous solution of urea was 3:97. The mixture was frozen at -20°C for 7 hours, and a transparent solution was obtained after thawing. Distilled water was added to the transparent solution to obtain a white floc, wherein the volume ratio of distilled water to the transparent solution was 10:1. Centrifuge to obtain a white gel, use deionized water to wash the gel until neutral, and obtain regenerated cellulose after centrifugation. The mixed solution of starch, sorbitol and distilled water was heated to 100°C and stirred for 20 minutes to obtain a colorless transparent viscous solution, in which the mass fractions of starch, sorbitol and distilled water were 10 wt%, 5 wt% and 85 wt%. ...

Embodiment 3

[0025] Add a certain amount of cotton (95% cellulose content) into NaOH / urea aqueous solution and mix well, wherein the mass ratio of NaOH, urea and distilled water is 5:8:87, and the mass ratio of cotton to NaOH / urea aqueous solution is 10 :90. The mixture was frozen at -20°C for 7 hours, and a transparent solution was obtained after thawing. Add distilled water to the transparent solution to obtain white flocs, wherein the volume ratio of distilled water to transparent solution is 10:1. A white gel was obtained by centrifugation, and the gel was washed with distilled water until neutral, and regenerated cellulose was obtained after centrifugation. The mixed solution of starch, sorbitol and distilled water was heated to 100°C and stirred for 20 minutes to obtain a colorless transparent viscous solution, in which the mass fractions of starch, sorbitol and distilled water were 15 wt%, 6 wt% and 79 wt%. Add the regenerated cellulose into the starch / sorbitol / distilled water mix...

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Abstract

The invention discloses a preparation method of a regenerated cellulose reinforced starch film. The method comprises the steps of dissolving cellulose by taking an alkaline / urea mixed water solution or alkaline / thiourea mixed water solution as a solvent, and then, preparing regenerated cellulose by using water as a coagulating bath; blending the regenerated cellulose and a starch solution, and coating after carrying out vacuum degassing. The elasticity modulus and elongation at break of the composite film are remarkably increased as comparison with those of a starch matrix. The cellulose and starch are wide in source and low in price and can be completely dissolved, so that the starch film is expected to be applied to the food packaging field.

Description

technical field [0001] The invention belongs to the field of high value-added utilization of cellulose resources, and relates to a preparation method of a novel regenerated cellulose-reinforced starch composite material. Background technique [0002] Cellulose is a very rich renewable polymer material, which is an inexhaustible resource for our earth, and its annual regeneration capacity reaches 1.0*10 10 Ton. And cellulose itself has high crystallinity, intermolecular and intramolecular hydrogen bonds, so the addition of cellulose has a significant impact on the mechanical properties, thermal stability and other properties of polymer materials. The use of fillers as polymer matrix has unparalleled advantages, which has attracted the attention of many researchers. [0003] As one of the biodegradable materials, starch has been recognized by the industry as a representative of new biodegradable materials with great development potential by virtue of its wide range of raw ma...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L1/02C08L71/08C08K5/053C08J5/18C08B16/00
Inventor 蔡小霞李聪申增辉
Owner QILU UNIV OF TECH
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