Preparation method of nanocellulose enhanced hemicellulose-based composite membrane

A nanocellulose and hemicellulose technology, applied in flexible coverings, packaging, wrapping paper, etc., can solve the problems of poor strength properties, poor mechanical properties of films, weak water resistance, etc., and achieve excellent film-forming properties, enhanced Strength properties, the effect of improving hardness

Active Publication Date: 2018-10-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sabiha-Hanim et al. studied the physical properties of bagasse hemicellulose-based membranes. The results showed that hemicellulose-based membranes have certain strength properties and water vapor transmission rates, but they have the disadvantage of poor strength properties.
This is because when hemicellulose is used alone as a film-forming material, its film mechanical properties are poor and its water resistance is weak.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of nano-cellulose reinforced hemicellulose-based composite membrane, the specific steps are as follows:

[0025] (1) Extraction of hemicellulose: Extract hemicellulose by cooking bagasse with sodium hydroxide, mix 800g of absolute dry bagasse and NaOH solution at a solid-to-liquid ratio of 1:5, and add it to the cooking pot. The amount of alkali used is 14%, that is, the amount of NaOH The quality is 14% of the absolute dry bagasse, and the hemicellulose is extracted by alkaline method by cooking at 100°C for 2 hours. After the reaction is completed, filter the filtrate to adjust the pH value to 2.0 with 2mol / L hydrochloric acid, and filter to remove the acid-insoluble lignin. Adjust the pH value of the filtrate to 4.5, add 3 times the volume of ethanol to flocculate and separate the flocs, wash the precipitates with acetone to neutrality, and dry them at 50°C to obtain hemicellulose, the hemicellulose The molecular weight is 7718g / mol;

[0026] (2...

Embodiment 2

[0032] A preparation method of a hemicellulose-based composite membrane, the specific steps are as follows:

[0033] (1) Extract hemicellulose by the bagasse alkali method in Example 1, the molecular weight of the hemicellulose is 7718g / mol;

[0034] (2) Dissolving the hemicellulose obtained in step (1) and commercially available soybean protein isolate in water respectively to obtain hemicellulose solution and soybean protein isolate solution, the molecular weight of soybean protein isolate is 100kDa;

[0035] (3) Mix the hemicellulose solution and soybean protein isolate solution in step (1) according to the mass ratio of hemicellulose and soybean protein isolate 7:3 to obtain a mixture A, stir the mixture A and add hemicellulose and glycerin, a plasticizer with 30% of the total mass of soybean protein isolate, stirred for 5 minutes, fully mixed evenly, and added water to prepare a mixed solution B with a total mass concentration of 3% of hemicellulose and soybean protein is...

Embodiment 3

[0039] A preparation method of nano-cellulose reinforced hemicellulose-based composite membrane, the specific steps are as follows:

[0040] (1) Extract hemicellulose by the bagasse alkali method in Example 1, the molecular weight of the hemicellulose is 7718g / mol;

[0041] (2) Dissolving the hemicellulose obtained in step (1) and the commercially available soybean protein isolate in water respectively to obtain a hemicellulose solution and a soybean protein isolate solution, the molecular weight of the soybean protein isolate is 80 kDa;

[0042] (3) Add 500nm nanocellulose NCC to water and stir at a speed of 50r / min, then slowly add 500nm nanocellulose NCC with 40% of the mass of 10nm nanocellulose NCC at a speed of 50r / min, contrary to the previous Stir evenly in the stirring direction to obtain a nanocellulose solution, wherein 500nm and 10nm are the lengths of the nanocellulose;

[0043] (4) Mix the hemicellulose solution and soybean protein isolate solution in step (2) a...

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Abstract

The invention discloses a preparation method of a nanocellulose enhanced hemicellulose-based composite membrane. The method comprises the following steps: respectively dissolving and uniformly mixinghemicellulose, soy isolate protein and nanocellulose, adding a plasticizer, sufficiently and uniformly mixing, adding water to form a solution with the concentration of 2 to 6 percent, performing ultrasonic degassing, adopting tape casting to form a membrane, laying the membrane into a thermostat at 40 to 60 DEG C for 4 to 7h, drying, and peeling off the membrane, so as to obtain the nanocelluloseenhanced hemicellulose-based composite membrane. The composite membrane has a stereochemical network structure, can effectively improve the mechanical property by about 50 percent, is excellent in light transmission, and can be applied to packaging of vegetables, fruits and meat products.

Description

technical field [0001] The invention belongs to the field of biomass food packaging materials, and in particular relates to a preparation method of a nanocellulose-reinforced hemicellulose-based composite film. Background technique [0002] Food packaging is an important part of the commodity industry. It can not only protect food from physical, chemical, and biological damage during circulation, but also maintain the stability of the quality of the food itself. However, the currently used food packaging materials are mainly non-renewable and refractory plastic products, which not only cause serious environmental pollution, but also endanger human health, which has aroused people's attention to the safety of food packaging. Therefore, natural, harmless and degradable packaging materials have become a research hotspot. As the second largest natural polysaccharide, hemicellulose has the characteristics of strong film-forming property, abundant yield, renewability and easy degr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/14C08L89/00C08L1/02C08K5/053C08J5/18C08B37/14B65D65/46
CPCB65D65/466C08B37/0003C08J5/18C08J2305/14C08J2389/00C08J2401/02C08J2405/14C08J2489/00C08K5/053
Inventor 刘玉新李娇阳黄吉振孙兵
Owner KUNMING UNIV OF SCI & TECH
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