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Preparation method of food-grade full-degradable high-temperature-resistant polylactic acid composite material

A high-temperature-resistant, composite material technology, applied in the field of biodegradable polymer materials, can solve the problems of weakening biodegradability, being unable to use in the field of food packaging, and difficult to take into account biodegradability, etc.

Inactive Publication Date: 2015-11-11
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In Chinese patent CN201110110906.5, a polylactic acid modified material and its preparation method, it is disclosed that the heat-resistant modification and toughening modification of pure new polylactic acid materials are simultaneously completed, thereby improving the heat resistance of polylactic acid, and its maintenance The Vicat softening point is around 85°C, which cannot be used in the field of high temperature resistant food packaging at this Vicat softening temperature point
[0011] It is found from the above Chinese patent disclosure that while improving the heat resistance of polylactic acid, it cannot be used in the field of food packaging, and it is difficult to take into account its unique biodegradability. If the modification process weakens the excellent biodegradation of the material itself It is unfavorable for the study of a green and environmentally friendly biodegradable material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Formula: about 10 kg of L-polylactic acid (molecular weight 150,000, domestic, extrusion grade), 1 kg of D-polylactic acid (molecular weight of 50,000, domestic), antioxidant [β-(3,5-di-tert-butyl- 4-Hydroxyphenyl) propionic acid n-octadecyl alcohol ester], light absorber phenyl salicylate is totally 50g;

[0030]Place PLLA and PDLA in a vacuum oven and dry for 8 hours for later use. Add PLLA, PDLA and functional additives in step 1 to the twin-screw extruder at the same time for melt blending and extrusion. The extruder screw temperature range is 170~210°C, the screw speed is 100~200rpm, and the screw length-to-diameter ratio is 15 ~48, a strong shear field mixing element and a weak shear field element are respectively loaded on the melting section and the homogenization section of the screw. The mixing element will uniformly disperse PDLA in the PLLA matrix, and the blend will induce Under the in-situ nucleation and stay at this stage for 20~40s, improve the stereoco...

Embodiment 2

[0032] Formula: about 10 kg of L-polylactic acid (molecular weight 150,000, domestic, extrusion grade), 5 kg of D-polylactic acid (molecular weight of 50,000, domestic), antioxidant [β-(3,5-di-tert-butyl- 4-Hydroxyphenyl) propionic acid n-octadecyl alcohol ester], light absorber phenyl salicylate totally 100g;

[0033] Place PLLA and PDLA in a vacuum oven and dry for 8 hours for later use. Add PLLA, PDLA and functional additives in step 1 to the twin-screw extruder at the same time for melt blending and extrusion. The extruder screw temperature range is 150~180°C, the screw speed is 100~200rpm, and the screw length-to-diameter ratio is 15 ~48, a strong shear field mixing element and a weak shear field element are respectively loaded on the melting section and the homogenization section of the screw. The mixing element will uniformly disperse PDLA in the PLLA matrix, and the blend will induce Under the in-situ nucleation and stay at this stage for 20~40s, improve the stereocom...

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PUM

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Abstract

The invention discloses a preparation method of a food-grade full-degradable high-temperature-resistant polylactic acid composite material, and belongs to the field of biodegradable high polymer materials. The composite material comprises, by weight, 100 parts of poly-l-lactic acid (PLLA), 1-10 parts of poly-d-lactic acid (PDLA) and 0.5-1 part of functional additives. Compared with traditional petroleum-based high polymer materials, the composite material has the advantages of being easy to degrade and renewable; compared with common polylactic acid, the composite material has excellent heat resistance. Thus, the polylactic acid composite material can be applied to high-temperature-resistant food packages.

Description

technical field [0001] The invention relates to a food-grade fully degradable high-temperature-resistant polylactic acid composite material and a preparation method thereof, belonging to the field of biodegradable polymer materials. Background technique [0002] Polylactic acid (PLA) is a non-toxic, fully biodegradable polymer. It not only has good chemical inertness and easy processing, but also has good biocompatibility, and is one of the most promising biodegradable polymer materials. Polylactic acid can be divided into L-polylactic acid, D-polylactic acid and racemic polylactic acid. Today, with the rapid development of industry, the shortage of petroleum resources and the highlight of environmental problems have made people's demand for non-petroleum-based plastics and environmentally friendly materials more and more high. As a bio-based material, polylactic acid not only has the function of being completely degradable, but also can be easily molded and processed on e...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K5/134B29C47/92B29C48/92
Inventor 李锦春李雄杰刘雨邹国享赵彩霞
Owner CHANGZHOU UNIV
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