Long-chain branched polylactic acid with high melt strength and excellent processing fluidity and preparation method thereof

A technology with processing fluidity and high melt strength, applied in the field of long-chain branched polylactic acid and its preparation, can solve the problems of reduced processing performance and increased shear viscosity of polylactic acid, and achieves improved processing performance and reduced shear viscosity. , controllable effect

Pending Publication Date: 2021-08-17
SHANTOU SAMMA PLASTIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the melt strength of polylactic acid can be improved by endowing polylactic acid with a long-chain branched structure by reactive extrusion technology, the shear viscosity of such long-chain branched polylactic acid often increases sharply, so that its processing performance is greatly reduced

Method used

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  • Long-chain branched polylactic acid with high melt strength and excellent processing fluidity and preparation method thereof
  • Long-chain branched polylactic acid with high melt strength and excellent processing fluidity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030]In this embodiment, the preparation method of this long-chain branched polylactic acid with high melt strength and excellent processing fluidity includes the following steps in sequence:

[0031] (1) By weight, the following raw materials are equipped: 98.30% polylactic acid, 0.50% organic peroxide (tert-amyl peroxy-2-ethylhexyl carbonate), 1.20% branching regulator (4-vinylbenzyl glycidyl ether);

[0032] (2) Dry the polylactic acid at 100°C for 120 minutes to make the moisture content of the polylactic acid lower than 200ppm, and cool to 20°C;

[0033] (3) Add organic peroxides and branching regulators to polylactic acid, and mix evenly to obtain a mixed material;

[0034] (4) Melt and extrude the mixed material through a twin-screw extruder, and granulate the material extruded by the twin-screw extruder to obtain a granular long-chain compound with high melt strength and excellent processing fluidity. branched polylactic acid.

[0035] The screw aspect ratio of the...

Embodiment 2

[0039] In this embodiment, the preparation method of this long-chain branched polylactic acid with high melt strength and excellent processing fluidity includes the following steps in sequence:

[0040] (1) By weight, the following raw materials are equipped: 97.70% polylactic acid, 1.50% organic peroxide (tert-amyl peroxy-2-ethylhexyl carbonate), 1.80% branching regulator (4-vinylbenzyl glycidyl ether);

[0041] (2) Dry the polylactic acid at 115°C for 60 minutes, so that the moisture content of the polylactic acid is lower than 200ppm, and cool to 20°C;

[0042] (3) Add organic peroxides and branching regulators to polylactic acid, and mix evenly to obtain a mixed material;

[0043] (4) Melt and extrude the mixed material through a twin-screw extruder, and granulate the material extruded by the twin-screw extruder to obtain a granular long-chain compound with high melt strength and excellent processing fluidity. branched polylactic acid.

[0044] The screw aspect ratio of...

Embodiment 3

[0048] In this embodiment, the preparation method of this long-chain branched polylactic acid with high melt strength and excellent processing fluidity includes the following steps in sequence:

[0049] (1) By weight, the following raw materials are equipped: 95.80% polylactic acid, 1.20% organic peroxide (tert-amyl peroxy-2-ethylhexyl carbonate), 2.50% branching regulator (4-vinylbenzyl glycidyl ether);

[0050] (2) Dry the polylactic acid at 120°C for 80 minutes so that the moisture content of the polylactic acid is lower than 200ppm, and cool to 25°C;

[0051] (3) Add organic peroxides and branching regulators to polylactic acid, and mix evenly to obtain a mixed material;

[0052] (4) Melt and extrude the mixed material through a twin-screw extruder, and granulate the material extruded by the twin-screw extruder to obtain a granular long-chain compound with high melt strength and excellent processing fluidity. branched polylactic acid.

[0053] The screw aspect ratio of ...

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Abstract

The invention discloses long-chain branched polylactic acid with high melt strength and excellent processing fluidity. The long-chain branched polylactic acid is characterized by being prepared from the following raw materials in percentage by weight: 93.00-99.80% of polylactic acid; 0.10-2.00% of an organic peroxide; and 0.1-5.00% of a branching regulating agent. The invention also provides a preparation method of the long-chain branched polylactic acid with high melt strength and excellent processing fluidity. According to the invention, a compound containing one vinyl or allyl group and one epoxy bond or isocyanate group is used as a branching regulating agent, and a long-chain branched structure is uniformly introduced into a polylactic acid molecular chain by adopting a reactive extrusion technology so that the long-chain branched polylactic acid has excellent melt strength and processing fluidity at the same time.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a long-chain branched polylactic acid with high melt strength and excellent processing fluidity and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is completely derived from biomass resources such as corn and sucrose, and has the characteristics of complete biodegradability and biocompatibility. Compared to other degradable materials such as polycaprolactone (PCL), polybutylene succinate (PBS), polyhydroxyalkanoate (PHA) and polybutylene adipate / terephthalate ( PBAT), etc., polylactic acid has the advantages of the largest production capacity, the lowest price, the best comprehensive performance and the widest application field. It is considered to be the most green and environmentally friendly new material with industrial application prospects. . [0003] However, as a linear aliphatic polyester, the melt strength of polylactic acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/02C08F212/14B29B9/06
CPCC08F283/02B29B9/06C08F212/22C08F212/26
Inventor 李鹏张晓智詹卡斯
Owner SHANTOU SAMMA PLASTIC IND CO LTD
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