Complete bio-based biodegradable polylactic acid composition and preparation method thereof

A technology of biodegradation and polylactic acid, applied in the field of fully bio-based biodegradable polylactic acid composition and its preparation, can solve the problems of large gap between thermodynamic properties and biodegradation performance, achieve good biodegradability, and realize commercialization , the effect of excellent comprehensive mechanical properties

Active Publication Date: 2015-01-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after different polymer types are blended, the thermodynamic properties and biodegradability of the polymer blends are very different. Therefore, the flexible copolyester of furandicarboxylic acid is used as a modifier to toughen and modify polylactic acid. Fully bio-based biodegradable polylactic acid blends still to be researched and developed

Method used

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  • Complete bio-based biodegradable polylactic acid composition and preparation method thereof
  • Complete bio-based biodegradable polylactic acid composition and preparation method thereof
  • Complete bio-based biodegradable polylactic acid composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Add 31.2 grams (0.2mol) of 2,5-furandicarboxylic acid, 35.4 grams (0.3mol) of succinic acid, 90 grams (1mol, alkyd-acid molar ratio) of butanediol, and titanic acid into the reactor. 85 milligrams of butyl esters (accounting for 0.05mol% of the total amount of dibasic acid monomers) were subjected to an esterification reaction at 160-200°C for 4 hours (this process is a temperature-programmed process) to obtain an esterified product; 85 mg of n-butyl titanate (accounting for 0.05 mol% of the total amount of dibasic acid monomers), at 200-240°C and 10-500Pa pressure (during the reaction, the pressure is gradually reduced from 500Pa to 10Pa), the melt polycondensation reaction After 5 hours, the flexible random copolyester-poly(butylene succinate-co-2,5-butylene furandicarboxylate) of hydroxyl-terminated furandicarboxylic acid was obtained;

[0051] (2) Add 113.4 grams of L-lactide to the product of step 1, and add 0.113 grams of stannous octoate (accounting for 0.1wt...

Embodiment 2

[0055] Add 31.2 grams (0.2mol) of 2,5-furandicarboxylic acid, 35.4 grams (0.3mol) of succinic acid, 90 grams (1mol, alkyd molar ratio of alcohol to acid) of 2,5-furandicarboxylic acid, 85 n-butyl titanate milligrams (accounting for 0.05mol% of the total amount of dibasic acid monomers), the esterification reaction was carried out at 160-200°C for 4 hours (the process is a temperature program), and the esterification product was obtained; 85 milligrams of butyl esters (accounting for 0.05mol% of dibasic acid monomer total amount), under 200~240 ℃, 15~300Pa pressure (in the reaction process, pressure is gradually reduced to 15Pa by 300Pa), melt polycondensation reaction 8 hours, Copolyesters are produced. Detected by nuclear magnetic resonance, the copolyester is furandicarboxylic acid random copolyester-poly(butylene succinate-copoly-2,5-furandicarboxylate) with 40mol% butanediol furandicarboxylate unit glycol ester), denoted as PBS 60 f 40 .

[0056] The polymer has a weig...

Embodiment 3

[0059] Polylactic acid (PLLA, commercially available Natureworks 3051D) and furandicarboxylic acid copolyester PBS 60 f 40 (Poly(butylene succinate-co-butylene furandicarboxylate) with 40 mol% butylene furandicarboxylate units, weight-average molecular weight of 73000 g / mol) was melted at a mass ratio of 80:20 Blending to make PLLA and PBS 60 f 40 of blends.

[0060] The blend has a tensile strength of 15MPa and an impact strength of 7.2kJ / m 2 . After 45 days of compost degradation, the average percent biodegradation was 76.4%.

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Abstract

The invention discloses a complete bio-based biodegradable polylactic acid composition and preparation method thereof. The composition is prepared by blending of (A) 60-95wt% of biological source biodegradable polylactic acid, (B) 5-40wt% of biodegradable furan dicarboxylic acid flexible copolyester prepared from biological source diacid and diol, and (C) a compatibilizer with 0-15% of a total mass of polylactic acid and copolyester. The blend provided by the invention is a product of blending modification on bio-based biodegradable brittle polymer-polylactic acid, and has the advantages of complete biological raw materials, full biodegradability, excellent impact resistance and comprehensive mechanical properties. The provided preparation method is simple technology, and has an environment-friendly process, thus being conducive to realizing commercialization.

Description

technical field [0001] The present invention relates to a polylactic acid composition and a preparation method thereof, in particular to a fully bio-based biodegradable polylactic acid composition and a preparation method thereof, which use furandicarboxylic acid flexible copolyester as a modifier to toughen and modify polylactic acid . Background technique [0002] As an environmentally friendly material prepared from renewable resources, bio-based polymers, as a substitute for traditional non-renewable petroleum-based polymers, are becoming more and more popular when the environment is deteriorating and petroleum resources are becoming increasingly tense. Pay attention to. However, due to the unsatisfactory mechanical properties of existing bio-based polymers, their application range is limited. Therefore, how to improve the mechanical properties of bio-based polymers is one of the research priorities that people are facing. [0003] Polylactic acid is an important biod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08G63/08C08G63/16
Inventor 吴林波徐煜韬
Owner ZHEJIANG UNIV
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