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Biodegradable film packaging material and preparation method thereof

A film packaging and biodegradable technology, applied in biological packaging, sustainable packaging industry, packaging, etc., can solve the problems of poor elongation at break, poor mechanical strength, low crystallinity, etc., and achieve improved crystallinity and good mechanical strength. Effect

Inactive Publication Date: 2014-10-29
江苏古沙农业科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the problems of low crystallinity, poor mechanical strength and poor elongation at break, the existing biodegradable materials are prone to fracture problems, which limits the application of biomaterials. Therefore, there is an urgent need for a material with good crystallinity, mechanical strength and good elongation at break of biodegradable materials
[0004] At the same time, when the existing biodegradable materials are printed on the surface, the ink only volatilizes, conjunctival, and solidifies, and cannot be well combined with the surface of the film, which may easily cause problems such as low printing quality and falling off of the printed pattern.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Dry polylactic acid, polyethylimide and polyvinyl alcohol with an average molecular weight of 6000 at 60°C for 3 hours and set aside;

[0030] (2) Mix 45kg of dried polylactic acid, 15kg of starch, 10kg of dried polyvinyl alcohol, 8kg of lignin and 4kg of glutaraldehyde at 140°C;

[0031] (3) Adjust the pH value of the product in step 2 to 6.5, add 0.5kg of sodium humate and 0.5kg of dried branched polyethyleneimine, and stir evenly at 80°C at a stirring rate of 450 rpm. Ultrasound at 30° C. for 0.5 hour, granulation and calendering, to obtain a 0.45 mm biodegradable film packaging material.

[0032] The performance test results of the prepared biodegradable film packaging materials are shown in Table 1.

Embodiment 2

[0034] (1) Dry polylactic acid, polyethylimide and polyvinyl alcohol with an average molecular mass of 8000 at 75°C for 2 hours and set aside;

[0035] (2) Mix 45kg of dried polylactic acid, 18kg of starch, 16kg of dried polyvinyl alcohol, 10kg of lignin and 6kg of glutaraldehyde at 120°C;

[0036] (3) Adjust the pH value of the product in step 2 to 6.5, add 1 kg of sodium humate and 1 kg of dried branched polyethyleneimine, and stir evenly at 90 °C at a stirring rate of 350 rpm. Ultrasound at ℃ for 1 hour, granulation and calendering, to obtain a 0.51mm biodegradable film packaging material.

[0037] The performance test results of the prepared biodegradable film packaging materials are shown in Table 1.

Embodiment 3

[0039] (1) Dry polylactic acid, polyethylimide and polyvinyl alcohol with an average molecular weight of 6000 at 60°C for 2 hours and set aside;

[0040] (2) Mix 66kg of dried polylactic acid, 20kg of starch, 18kg of dried polyvinyl alcohol, 10kg of lignin and 6kg of glutaraldehyde at 130°C;

[0041] (3) Adjust the pH value of the product in step 2 to 6.5, add 2kg of sodium humate and 0.5kg of dried branched polyethyleneimine, and stir evenly at 80°C at a stirring rate of 300 rpm. Ultrasound at 35°C for 0.5 hours, granulation and calendering to obtain a biodegradable film packaging material with a thickness of 0.56mm.

[0042] The performance test results of the prepared biodegradable film packaging materials are shown in Table 1.

[0043] Table 1

[0044] Test items Example 1 Example 2 Example 3 Tensile strength (MPa) 18 21 25 elongation at break 38% 44% 49%

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Abstract

The invention discloses a biodegradable film packaging material and a preparation method thereof. The biodegradable film packaging material is prepared from the following components in parts by weight: 45-66 parts of polylactic acid, 20-30 parts of starch, 10-18 parts of polyvinyl alcohol, 8-10 parts of lignin, 0.5-2 parts of sodium humate, 0.5-1 part of poly(ethylene imine) and 4-6 parts of glutaraldehyde. The biodegradable film packaging material prepared by using the method disclosed by the invention is favorable in crystallinity, mechanical strength and elongation at break, free of special treatment on the surface, good in film surface tension and capable of favorably bonding ink and the film packaging material.

Description

technical field [0001] The invention belongs to the field of film packaging materials, in particular to a biodegradable film packaging material and a preparation method thereof. Background technique [0002] With the development of the current society, various functional materials emerge in an endless stream. As people pay more and more attention to environmental issues, biodegradable materials have become a hot spot in current research and development, which can alleviate environmental problems to a certain extent. Therefore, materials with good biocompatibility, bioabsorbability and biodegradability are increasingly required by people. [0003] This type of biodegradable film material is widely used in the field of packaging and film materials for various products. Due to the problems of low crystallinity, poor mechanical strength and poor elongation at break, the existing biodegradable materials are prone to fracture problems, which limits the application of biomaterial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08L29/04C08L97/02C08L79/02C08L99/00C08K5/07C08J5/18B65D65/38
CPCY02W90/10
Inventor 张太元
Owner 江苏古沙农业科技发展有限公司
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