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Polylactic acid melt reinforcing agent and preparation method thereof

A technology of melt enhancer and polylactic acid, which is applied in the field of melt enhancer and its preparation for blow molding of polylactic acid, can solve the problems of easy migration and the compatibility of polylactic acid needs to be improved, and achieve simple and good formula The prospect of industrialized production, the effect of adding less

Pending Publication Date: 2021-04-13
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyethylene glycol is easy to migrate in the polylactic acid matrix, and its compatibility with polylactic acid needs to be improved

Method used

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  • Polylactic acid melt reinforcing agent and preparation method thereof
  • Polylactic acid melt reinforcing agent and preparation method thereof
  • Polylactic acid melt reinforcing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A polylactic acid melt enhancer provided by the present invention and its preparation method, the preparation process is as follows: 100 parts of D-LA and 125 parts of PEG10000 (Mn=10000) are fed nitrogen into the reactor, heated to 150 ° C and melted After 30 minutes, add 0.5 parts of stannous octoate catalyst, keep the nitrogen atmosphere and continue to stir the reaction for 18 hours. After the reaction is completed, the solid obtained is a block copolymer PDLA- PEG-PDLA.

[0033] Take 5 parts of the prepared PDLA-PEG-PDLA and add it to the polylactic acid matrix for melt blending, and blend at 175°C for 5 minutes to obtain a composite material. The preferred number of parts of the polylactic acid matrix is ​​250-20 parts.

Embodiment 2

[0035] A polylactic acid melt enhancer provided by the present invention and its preparation method, the preparation process is: feed 100 parts of D-LA and 25 parts of PEG2000 (Mn=2000) into a reaction kettle with nitrogen, heat to 150°C and melt After 30 minutes, add 0.5 parts of stannous octoate catalyst, keep the nitrogen atmosphere and continue to stir the reaction for 18 hours. After the reaction is completed, the solid obtained is a block copolymer PDLA- PEG-PDLA.

[0036] Take 5 parts of the prepared PDLA-PEG-PDLA and add it to the polylactic acid matrix for melt blending, and blend at 175°C for 5 minutes to obtain a composite material. The preferred number of parts of the polylactic acid matrix is ​​250-20 parts.

Embodiment 3

[0038] A polylactic acid melt enhancer provided by the present invention and its preparation method, the preparation process is as follows: 100 parts of D-LA and 50 parts of PEG4000 (Mn=4000) are fed nitrogen into the reactor, heated to 150 ° C and melted After 30 minutes, add 0.5 parts of stannous octoate catalyst, keep the nitrogen atmosphere and continue to stir the reaction for 18 hours. After the reaction is completed, the solid obtained is a block copolymer PDLA- PEG-PDLA.

[0039] Take 5 parts of the prepared PDLA-PEG-PDLA and add it to the polylactic acid matrix for melt blending, and blend at 175°C for 5 minutes to obtain a composite material. The preferred number of parts of the polylactic acid matrix is ​​250-20 parts.

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Abstract

The invention discloses a polylactic acid melt reinforcing agent and a preparation method thereof. The copolymer involved in the invention forms a stereocomplex crystal network with a higher melting point mainly through a dextral polylactic acid PDLA chain segment in PDLA-PEG-PDLA and a matrix levorotatory polylactic acid PLLA molecular chain, the melt strength is increased, the PEG segment not only has the effect of improving molecular motion and promoting the formation of stereocomplex crystals, and but also has the effect of toughening the whole blend. The reinforcing agentdisclosed by the invention has the advantages of small addition amount, simple formula and the like, and has a good industrial production prospect.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a melt enhancer for polylactic acid blow molding and its preparation method and application. Background technique [0002] As the most potential bio-based degradable material in the 21st century, polylactic acid has received extensive attention and research. Among them, L-polylactic acid is currently the most widely used industrially synthesized biodegradable material, and it is gradually replacing the application of polyolefins in some general-purpose plastics. [0003] Melt strength is considered to be one of the most critical parameters in the polymer molding process, which affects the stability of melt spinning, extrusion, blow molding, foaming and other molding processes. The molecular chain of polylactic acid is relatively rigid, and the low entanglement density leads to its low melt strength. Therefore, its melt spinning, extrusion, foaming, blow molding, etc. are difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/664C08G63/66C08L67/04
CPCC08G63/664C08G63/66C08L67/04C08L2205/025C08L2201/06
Inventor 江元平杨鸣波严悰刘正英
Owner EAST CHINA UNIV OF TECH
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