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Multilayer composite membrane and preparation method therefor

A multi-layer composite film and composite layer technology, applied in the field of food packaging materials, can solve the problems of easy peeling of multi-layer structures, affecting the packaging effect of materials, cracking, etc., and achieve the effect of maintaining mechanical properties, good mechanical properties, and avoiding failure

Active Publication Date: 2020-01-24
扬州市华裕包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is: in the process of product use, the multi-layer structure is prone to peeling, cracking and other problems after being folded or collided many times in the product use process, thus affecting the packaging effect of the material. disadvantages, a multi-layer composite film and preparation method thereof are provided

Method used

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  • Multilayer composite membrane and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]In parts by weight, take 10 parts of silicate, 8 parts of titanate, 60 parts of absolute ethanol, 10 parts of fatty acid, 20 parts of polylactic acid, 80 parts of tetrahydrofuran, and 4 parts of graphene oxide. In tetrahydrofuran, at a temperature of 55 °C and a stirring speed of 300 r / min, keep stirring and dissolving for 45 minutes, and then under stirring, add graphene oxide, silicate, titanate, anhydrous ethanol and fatty acid in sequence, and continue After stirring for 10 min, under the condition of temperature of 85 ℃, heating and refluxing for 3 h, after the reaction is over, transfer the material to the casting machine while it is still hot, and cast the film to form a film. dry to obtain a dry film;

[0037] Fix the dry film on the tensile machine, first stretch the dry film longitudinally along the dry film to 1.1 times the original length of the dry film, and then stretch the dry film laterally along the dry film to 1.1 times the original width of the dry fil...

Embodiment 2

[0046] In parts by weight, sequentially take 12 parts of silicate, 9 parts of titanate, 70 parts of absolute ethanol, 12 parts of fatty acid, 25 parts of polylactic acid, 90 parts of tetrahydrofuran, and 5 parts of graphene oxide, first add polylactic acid to In tetrahydrofuran, under the condition that the temperature is 60 °C and the stirring speed is 400 r / min, keep stirring and dissolving for 55 minutes, and then under stirring, add graphene oxide, silicate, titanate, anhydrous ethanol and fatty acid in sequence, and continue After stirring for 15min, under the condition of temperature of 88 ℃, heating and refluxing reaction for 4h, after the reaction is over, transfer the material to the casting machine while it is still hot, cast a film, control the blade distance of the casting machine to be 4mm, and then pass dry to obtain a dry film;

[0047] Fix the dry film on the tensile machine, first stretch the dry film longitudinally along the dry film to 1.1 times the original...

Embodiment 3

[0056] In parts by weight, sequentially take 15 parts of silicate, 10 parts of titanate, 80 parts of absolute ethanol, 15 parts of fatty acid, 30 parts of polylactic acid, 100 parts of tetrahydrofuran, and 6 parts of graphene oxide. In tetrahydrofuran, under the condition that the temperature is 65°C and the stirring speed is 500r / min, keep stirring and dissolve for 60min, and then under stirring, add graphene oxide, silicate, titanate, anhydrous ethanol and fatty acid in sequence, and continue After stirring for 20 min, under the condition of temperature of 90 ℃, heating and refluxing for 5 h, after the reaction is over, transfer the material to the casting machine while it is still hot, and cast the film to form a film. dry to obtain a dry film;

[0057] Fix the dry film on the tensile machine, first stretch the dry film longitudinally to 1.2 times the original length of the dry film, and then stretch the dry film laterally to 1.2 times the original width of the dry film, an...

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Abstract

The invention discloses a multilayer composite membrane and a preparation method therefor and belongs to the technical field of food packaging materials. The preparation method comprises the steps: firstly, dissolving and dispersing polylactic acid into tetrahydrofuran, then, adding graphene oxide, silicate, titanate, anhydrous ethanol and fatty acid, carrying out a heated refluxing reaction, andcarrying out flow casting film forming, so as to obtain a dry film; drawing the dry film, and then, carrying out alkali liquor soaking and drying, so as to obtain a basal membrane; and then, paintingthe surface of the basal membrane with a coating solution with polyethylene glycol phosphate, carboxymethyl chitosan and terephthalaldehyde, carrying out drying after painting is completed, then, carrying out secondary painting, carrying out repeated painting by 5 to 10 layers in such a manner, carrying out vacuum drying until the weight is constant after the painting of last layer is completed soas to form a composite layer on the surface of the basal membrane, and then, carrying out hot-pressing and discharging, thereby obtaining the multilayer composite membrane. The multilayer composite membrane disclosed by the invention can still maintain good mechanical properties after repeated folding and the like, and naked eyes cannot observe layering and cracking.

Description

technical field [0001] The invention discloses a multilayer composite film and a preparation method thereof, belonging to the technical field of food packaging materials. Background technique [0002] Food packaging has the functions of ensuring food hygiene, extending food shelf life, facilitating food consumption, and promoting sales. It is an indispensable link in the process of food production and sales. At present, in my country's food packaging materials, the application of plastics has exceeded 50% of the total food packaging materials, ranking first among all kinds of packaging materials. The vast majority of plastic food packaging cannot be recycled, causing great harm to the environment. With the enhancement of people's awareness of environmental protection, green packaging made of natural biological materials has gradually become a research hotspot in the field of food packaging. [0003] Green packaging refers to packaging that is harmless to the ecological env...

Claims

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Application Information

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IPC IPC(8): C08J9/36C08J9/26C08J5/18C08L67/04C08K13/02C08K3/04C08K5/09C09D105/08C09D7/63
CPCC08J9/365C08J9/26C08J5/18C08J2367/04C08J2405/08C08K5/07C08J2201/044
Inventor 汤恒健王存岭陈明耀
Owner 扬州市华裕包装有限公司
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