Tea dregs modified oxidized cellulose composite film and its preparation method and application

A technology of oxidizing cellulose and composite film, which is applied in the direction of preserving meat/fish with chemicals, and can solve the problems of large amount of plasticizer, low extraction rate and purity of tea dregs hemicellulose, and high price of laccase, so as to reduce Good effect of crystallinity, renewable price, and biodegradability

Active Publication Date: 2021-07-30
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Invention Patent Publication No.: "CN104059239A" discloses a method for making plastic wrap with tea dregs. Using tea dregs as raw material, low molecular weight hemicellulose is obtained by lye extraction, laccase hydrolysis and ultrafiltration purification, and then in the hemicellulose Add plasticizer to cellulose solution to prepare hemicellulose plastic wrap with high mechanical strength and easy degradation. However, this method has the disadvantages of high price of laccase, low extraction rate and purity of hemicellulose from tea dregs, and large amount of plasticizer. Problem, the purpose of this invention is only to prepare lower molecular weight hemicellulose and hemicellulose cling film from tea dregs

Method used

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  • Tea dregs modified oxidized cellulose composite film and its preparation method and application
  • Tea dregs modified oxidized cellulose composite film and its preparation method and application
  • Tea dregs modified oxidized cellulose composite film and its preparation method and application

Examples

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Effect test

Embodiment 1

[0032] (1) Soak tea residues in deionized water at 70°C for 4 hours to remove soluble pigments, wash and dry at 80°C for 4 hours, crush and pass through a 150-mesh sieve to obtain tea residue powder.

[0033] (2) Add selective oxidized cotton cellulose to 25 g of ionic liquid 1-butyl-3-methylimidazole acetate, heat the oil bath to 95 ° C and continue stirring for 45 minutes to dissolve the selectively oxidized cellulose and obtain the selected An ionic liquid solution of selectively oxidized cotton cellulose, wherein the mass concentration of selectively oxidized cotton cellulose is 1%.

[0034] Wherein, the selective oxidized cellulose is obtained as follows: cotton cellulose is pulverized, passed through an 80-mesh sieve, immersed in a sodium hydroxide solution with a mass concentration of 8%, and ultrasonically treated for 45min at 25°C (ultrasonic frequency: 20kHz, the ultrasonic intermittent time is 5s, the working time is 3s, and the ultrasonic power is 600W), then fully...

Embodiment 2

[0039] (1) Soak tea residues in deionized water at 75°C for 4 hours to remove soluble pigments, dry at 90°C for 5 hours after washing, and pass through a 150-mesh sieve after crushing to obtain tea residue powder;

[0040] (2) Add selective oxidized cotton cellulose to 25g of ionic liquid 1-allyl-3-methylimidazolium chloride salt, heat the oil bath to 90°C and continue stirring for 90min to dissolve the selectively oxidized cellulose and obtain the selected An ionic liquid solution of selectively oxidized cotton cellulose, wherein the mass concentration of selectively oxidized cotton cellulose is 1.2%.

[0041] Wherein, the selective oxidized cellulose is obtained as follows: cotton cellulose is pulverized, passed through an 80-mesh sieve, immersed in a sodium hydroxide solution with a mass concentration of 9%, and ultrasonically treated at 35°C for 30min (ultrasonic frequency: 20kHz, the ultrasonic intermittent time is 5s, the working time is 3s, and the ultrasonic power is 8...

Embodiment 3

[0047] (1) Soak tea residues in deionized water at 80°C for 3 hours to remove soluble pigments, wash and dry at 95°C for 4 hours, crush and pass through a 150-mesh sieve to obtain tea residue powder;

[0048] (2) Add selective oxidized cotton cellulose to 30 g of ionic liquid 1-allyl-3-methylimidazolium chloride salt, heat the oil bath to 95 ° C and continue stirring for 60 minutes to dissolve the selectively oxidized cellulose and obtain the selected An ionic liquid solution of selectively oxidized cotton cellulose, wherein the mass concentration of selectively oxidized cotton cellulose is 1.5%.

[0049] Wherein, the selective oxidized cellulose is obtained as follows: cotton cellulose is pulverized, passed through an 80-mesh sieve, immersed in a sodium hydroxide solution with a mass concentration of 9%, and ultrasonically treated at 30°C for 50min (ultrasonic frequency: 20kHz, the ultrasonic intermittent time is 5s, the working time is 3s, and the ultrasonic power is 800W), ...

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Abstract

The invention discloses a tea dregs modified oxidized cellulose composite film and its preparation method and application, which is obtained by imine chemical reaction between the aldehyde group in the selective oxidized cellulose molecule and the amino group in the tea dregs. The tea dregs modified oxidized cellulose composite film prepared by the invention has good mechanical strength, biodegradability and oxidation resistance, is safe and hygienic, can be used for keeping fresh pork at room temperature, and can prolong the shelf life of food.

Description

technical field [0001] The invention relates to an oxidized cellulose composite film chemically modified by tea dregs and its preparation method and application, belonging to the technical field of packaging materials and food preservation. Background technique [0002] Today, with the advancement of science and technology, the use of plastic wrap has entered thousands of households and has become a must-have for daily life. As a commonly used plastic packaging product for fresh-keeping food, fresh-keeping film has moderate oxygen permeability and moisture permeability, which can adjust the oxygen content and moisture content around the fresh-keeping product, block microorganisms and dust in the air, and achieve the purpose of fresh-keeping food . Currently used cling film materials mainly include polyethylene (PE), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC) and other polymer plastic films. The raw materials of these plastic cling films come from non-renewable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L87/00C08G81/00A23B4/20
CPCA23B4/20C08G81/00C08J5/18C08J2387/00
Inventor 许云辉宛晓春刘检谢文东段先锋
Owner ANHUI AGRICULTURAL UNIVERSITY
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