Preparation method of novel biodegradable wrapping film

A biodegradable and stretch film technology, which is applied in the field of packaging film, can solve the problems of being susceptible to corrosion damage, shortening the service life of stretch film, and low strength in use, and achieves easy degradation, reduced raw material costs, good strength and corrosion resistance. Effect

Pending Publication Date: 2021-11-02
常州万泉新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing stretch film is environmentally friendly and has low use strength, and is easily damaged by corrosion, which shortens the service life of the stretch film, and at the same time cannot achieve the inherent effect of the original stretch film, or uses non-degradable materials for use. Not environmentally friendly

Method used

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  • Preparation method of novel biodegradable wrapping film

Examples

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Effect test

preparation example Construction

[0049] see figure 1 , the present invention provides a method for preparing a novel biodegradable stretch film. The biodegradable stretch film is mainly prepared by combining glycolic acid-lactic acid copolymer with polylactic acid, polyhydroxyalkanoate and polyvinyl alcohol;

[0050] Its biodegradable stretch film is prepared from the following raw materials in parts by weight:

[0051] Glycolic acid-lactic acid copolymer: 70-95 parts

[0052] Polylactic acid: 5-10 parts

[0053] Polyhydroxyalkanoate: 2-16 parts

[0054] Polyvinyl alcohol: 1-5 parts

[0055] Antioxidant 0.1-0.6 parts

[0056] Processing aid 0.2-1.2 parts.

[0057] It is characterized in that the above materials are added in different ratios to prepare A group materials, B group materials, and C group materials, and the specific ratios are as follows:

Embodiment 1

[0059] Group A

[0060] Glycolic acid-lactic acid copolymer: 70 parts

[0061] Polylactic acid: 10 parts

[0062] Polyhydroxyalkanoate: 16 parts

[0063] Polyvinyl alcohol: 2.5 parts

[0064] Antioxidant 0.5 parts

[0065] 1 part processing aid

[0066] In this example, 70 parts of glycolic acid-lactic acid copolymer, 10 parts of polylactic acid, 16 parts of polyhydroxyalkanoate, 2.5 parts of polyvinyl alcohol, 0.5 parts of antioxidant and 1 part of processing aid were poured into High-speed mixer, set the temperature at 30 degrees, the speed is 360 rpm, mix the material for 10-25 minutes, then go through the twin-screw granulator for stretching and pelletizing, and then put the pelletized material into the first casting machine The screw feeds the hopper, and finally the twin-screw casting machine extrudes the thermally synthesized single-layer film to form a film, and then cools to obtain a biodegradable stretch film.

Embodiment 2

[0068] Group B material

[0069] Glycolic acid-lactic acid copolymer: 80 parts

[0070] Polylactic acid: 6 parts

[0071] Polyhydroxyalkanoates: 11 parts

[0072] Polyvinyl alcohol: 1.5 parts

[0073] Antioxidant 0.5 parts

[0074] 1 part processing aid

[0075] In this example, glycolic acid-lactic acid copolymer: 80 parts, polylactic acid: 6 parts, polyhydroxyalkanoate: 11 parts, polyvinyl alcohol: 1.5 parts, antioxidant 0.5 part and processing aid 1 part were poured into High-speed mixer, set the temperature at 30 degrees, the speed is 360 rpm, mix the material for 10-25 minutes, then go through the twin-screw granulator for stretching and pelletizing, and then put the pelletized material into the first casting machine The screw feeds the hopper, and finally the twin-screw casting machine extrudes the thermally synthesized single-layer film to form a film, and then cools to obtain a biodegradable stretch film.

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Abstract

The invention relates to the technical field of packaging films, in particular to a preparation method of a novel biodegradable wrapping film. The biodegradable wrapping film is mainly prepared by combining glycolic acid-lactic acid copolymer with polylactic acid, polyhydroxyalkanoate and polyvinyl alcohol materials. The biodegradable wrapping film is prepared from the following raw materials in parts by weight: 70-95 parts of glycolic acid-lactic acid copolymer, 5-10 parts of polylactic acid, 2-16 parts of polyhydroxyalkanoate, 1-5 parts of polyvinyl alcohol, 0.1-0.6 parts of an antioxidant and 0.2-1.2 parts of a processing aid. The biodegradable wrapping film is prepared by combining the glycolic acid-lactic acid copolymer with the polylactic acid, polyhydroxyalkanoate and polyvinyl alcohol materials, so that the use performance of the wrapping film is ensured under the condition that the film is environment-friendly, and the wrapping film has relatively good strength and corrosion resistance; and meanwhile, it can be guaranteed that the outer wall of the biodegradable wrapping film is smooth, the inner side is high in viscosity, the cost of raw materials is effectively reduced, and degradation treatment can be conducted relatively easily.

Description

technical field [0001] The invention relates to the technical field of packaging films, in particular to a preparation method of a novel biodegradable stretch film. Background technique [0002] Stretch film, also known as stretch film and heat shrinkable film, was the first in China to produce PVC stretch film with PVC as the base material and DOA as the plasticizer and self-adhesive effect. Due to environmental protection issues, high cost (compared to PE, relatively large proportion, small unit packaging area), poor stretchability and other reasons, when PE stretch film was produced in China from 1994 to 1995, it was gradually eliminated. PE stretch film first used EVA as the self-adhesive material, but its cost was high and tasteful. Later, PIB and VLDPE were used as the self-adhesive material, and the base material was mainly LLDPE, including C4, C6, C8 and metallocene PE ( MPE). [0003] The existing stretch film is environmentally friendly and has low use strength, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L29/04C08J5/18
CPCC08J5/18C08J2367/04C08J2467/04C08J2429/04
Inventor 张民心
Owner 常州万泉新材料科技有限公司
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