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Method for cleanly preparing bioplastic food packaging film at low cost

A technology of food packaging film and bioplastics, applied in flat products, applications, coatings, etc., can solve the problems of incomplete cellulose treatment, food safety impact, short production process, etc., to improve thermoplastic processing performance and production cost The effect of low cost and high production efficiency

Inactive Publication Date: 2018-04-13
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Li Zhe invented a method for preparing cellulose film for food packaging (China Invention Patent Application No. 201610540555.4), which includes the following steps: preparing modified nano-vermiculite powder and preparing cellulose film. The process steps are simple and will not pollute the environment. The production process Short, the whole process is mild, and the formula of the film-forming liquid is optimized and improved at the same time. The thickness of the prepared cellulose film for food packaging is uniform and the product performance is excellent. However, this method fails to solve the problem of poor thermoplasticity caused by the high crystallinity of cellulose molecules. Problems that are difficult to completely degrade
In addition, Chinese Invention Patent Application No. 201510555850.2 discloses a method for preparing methylcellulose-lipid packaging film. The steps include: (1) Weighing methylcellulose, adding hot ethanol aqueous solution, adding plasticizer after fully dissolving (2) After the mixed film liquid is co-treated with microwave and ultrasonic waves, it is cast into a film, dried, and the film is peeled off to obtain a food packaging film, but this method is not thorough enough for the treatment of cellulose , and have a certain impact on food safety due to the addition of plasticizers

Method used

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  • Method for cleanly preparing bioplastic food packaging film at low cost

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A low-cost clean method for preparing a bioplastic food packaging film, the specific process of preparing the food packaging film is as follows:

[0028] (1) Put hydroxypropyl methylcellulose in a quartz pot, put it into a vacuum chamber, and carry out magnetic stirring. At the same time, connect the vacuum chamber to the extreme ultraviolet generator so that the direction of the exit of the extreme ultraviolet light is aligned with the cellulose. During the stirring process, the cellulose undergoes hydrogen bond destruction under the bombardment of extreme ultraviolet high-energy radiation, and the treatment time of extreme ultraviolet light is 4 to 6 minutes to obtain modified cellulose;

[0029] (2) Mix the modified cellulose obtained in step (1) with polylactic acid, gallic acid, and glycerin in a mass ratio of 20:40:1:2, heat in a mixer at 100°C, and stir at a speed of 60r / min , the mixing time was 15min, and then added to an extrusion calender to obtain a prototyp...

Embodiment 2

[0033] A low-cost clean method for preparing a bioplastic food packaging film, the specific process of preparing the food packaging film is as follows:

[0034](1) Put hydroxyethyl cellulose in a quartz pot, put it into a vacuum chamber, and carry out magnetic stirring. At the same time, connect the vacuum chamber to the extreme ultraviolet generator so that the direction of the extreme ultraviolet light exit is aligned with the cellulose. During the magnetic stirring process, In the process, the cellulose undergoes hydrogen bond destruction under the bombardment of extreme ultraviolet high-energy radiation, and the treatment time of extreme ultraviolet light is 5 minutes to obtain modified cellulose;

[0035] (2) Mix the modified cellulose obtained in step (1) with polylactic acid, gallic acid, and glycerin in a mass ratio of 30:30:2:2, heat in a mixer at 120°C, and stir at a speed of 80r / min , the mixing time is 20min, and then added to the prototype film of the extrusion ca...

Embodiment 3

[0039] A low-cost clean method for preparing a bioplastic food packaging film, the specific process of preparing the food packaging film is as follows:

[0040] (1) Put carboxymethyl cellulose in a quartz pot, put it into a vacuum chamber, and carry out magnetic stirring. At the same time, connect the vacuum chamber to the extreme ultraviolet generator so that the direction of the extreme ultraviolet light exit is aligned with the cellulose. During the magnetic stirring process, Among them, the cellulose undergoes hydrogen bond destruction under the bombardment of extreme ultraviolet high-energy radiation, and the treatment time of extreme ultraviolet light is 6 minutes to obtain modified cellulose;

[0041] (2) Mix the modified cellulose obtained in step (1) with polylactic acid, gallic acid, and glycerin in a mass ratio of 50:40:3:5, heat in a mixer at 100°C, and stir at a speed of 60r / min , the mixing time is 15min, and then added to the prototype film of the extrusion cale...

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Abstract

The invention belongs to the technical field of preparation of packaging films and provides a method for cleanly preparing a bioplastic food packaging film at low cost. The method comprises the following steps: preparing modified cellulose by utilizing hydrogen bonds of ultra ultraviolet radiation high-energy bombardment destroyed cellulose in a vacuum environment, wherein the modified cellulose has a good thermoplastic property; matching polylactic acid, gallic acid and glycerol for calendaring to obtain a prototype film; further melting polyadipic acid-butylene terephthalate and polycarbonate into slurry and coating the surface of the prototype film with the slurry; carrying out rolling, stretching and shaping, thus obtaining a food packaging film. The packaging film prepared by the method has the advantages of stretch resistance, barrier property and good contacting safety with food; in addition, the method has the advantages of simple technological operation in the whole process, high production efficiency, low production cost and capability of realizing batch production.

Description

technical field [0001] The invention belongs to the technical field of packaging film preparation and provides a low-cost and clean method for preparing bioplastic food packaging film. Background technique [0002] With the advancement of science and technology and the improvement of people's consumption level, food packaging is becoming more and more important in people's lives. Fresh-keeping, environmental protection and convenience are the new fashions in the development of food packaging. The choice of packaging should not only take into account the requirements of food packaging, the wishes of consumers and the needs of manufacturers, but also the coordination and unification of products, packaging and the environment. [0003] The current food packaging materials have achieved good development in terms of functionality, environmental protection and aesthetics. Because food packaging films have excellent performance in efficiently protecting food safety, and at the same...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08L67/04C08L1/28C08J5/18C08B11/20B29D7/01C08L67/02C08L69/00
CPCB29D7/01C08B11/20C08J5/18C08J7/0427C08J2367/04C08J2401/28C08J2467/02C08J2469/00
Inventor 陈庆昝航
Owner CHENDU NEW KELI CHEM SCI CO LTD
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