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Foaming-grade polylactic acid with excellent processing fluidity and preparation method thereof

A technology for processing fluidity and polylactic acid, which is applied in the field of foaming grade polylactic acid and its preparation, can solve the problems of reduced processing performance and increased shear viscosity of polylactic acid, and achieves improved shear viscosity, excellent foamability, Controllable Effects

Active 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

However, with the significant increase in the melt strength of PLA, the shear viscosity of PLA tends to increase sharply, so that its processing performance is greatly reduced.

Method used

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  • Foaming-grade polylactic acid with excellent processing fluidity and preparation method thereof
  • Foaming-grade polylactic acid with excellent processing fluidity and preparation method thereof
  • Foaming-grade polylactic acid with excellent processing fluidity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In this embodiment, the preparation method of the foamed grade polylactic acid with excellent processing fluidity includes the following steps in sequence:

[0033] (1) By weight, the following raw materials are equipped with: polylactic acid 98.50%, organic peroxide 0.30% (tert-amyl peroxy-2-ethylhexyl carbonate), branching regulator 0.30% (4-vinylbenzyl carbonate) Glycidyl ether), 0.60% nucleating agent (wherein nano-montmorillonite 0.30%, N, N'-ethylene bisstearic acid amide 0.30%), lubricant 0.30% (pentaerythritol tetrastearate);

[0034] (2) Dry polylactic acid, nucleating agent and lubricant at 110°C for 95 minutes, and cool to 25°C;

[0035] (3) Mix organic peroxide, branching control agent, polylactic acid, nucleating agent and lubricant uniformly to obtain mixed material;

[0036] (4) Melting and extruding the mixed material through a twin-screw extruder, and granulating the material extruded by the twin-screw extruder to obtain foamed grade polylactic acid wi...

Embodiment 2

[0042] In this embodiment, the preparation method of the foamed grade polylactic acid with excellent processing fluidity includes the following steps in sequence:

[0043] (1) By weight, the following raw materials are equipped: polylactic acid 97.40%, organic peroxide 0.50% (tert-amyl peroxy-2-ethylhexyl carbonate), branching regulator 0.60% (4-vinylbenzyl carbonate) Glycidyl ether), nucleating agent 1.00% (nano-montmorillonite 0.50%, N, N'-ethylene bisstearic acid amide 0.50%), lubricant 0.50% (pentaerythritol tetrastearate);

[0044] (2) Dry polylactic acid, nucleating agent and lubricant at 100°C for 120 minutes, and cool to 30°C;

[0045] (3) Mix organic peroxide, branching control agent, polylactic acid, nucleating agent and lubricant uniformly to obtain mixed material;

[0046] (4) Melting and extruding the mixed material through a twin-screw extruder, and granulating the material extruded by the twin-screw extruder to obtain foamed grade polylactic acid with excellent...

Embodiment 3

[0052] In this embodiment, the preparation method of the foamed grade polylactic acid with excellent processing fluidity includes the following steps in sequence:

[0053] (1) By weight, the following raw materials are equipped: polylactic acid 96.00%, organic peroxide 0.90% (tert-amyl peroxy-2-ethylhexyl carbonate), branching regulator 1.00% (4-vinylbenzyl Glycidyl ether), nucleating agent 1.30% (wherein nano-montmorillonite 0.50%, N, N'-ethylene bisstearic acid amide 0.80%), lubricant 1.00% (pentaerythritol tetrastearate);

[0054] (2) Dry polylactic acid, nucleating agent and lubricant at 95°C for 115 minutes, and cool to 20°C;

[0055] (3) Mix organic peroxide, branching control agent, polylactic acid, nucleating agent and lubricant uniformly to obtain mixed material;

[0056] (4) Melting and extruding the mixed material through a twin-screw extruder, and granulating the material extruded by the twin-screw extruder to obtain foamed grade polylactic acid with excellent pro...

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Abstract

The invention discloses foaming-grade polylactic acid with excellent processing fluidity. The foaming-grade polylactic acid is characterized by being prepared from the following raw materials in percentage by weight: 87.00-99.60% of polylactic acid; 0.10-2.00% of an organic peroxide; 0.10-3.00% of a branching regulating agent; 0.10-5.00% of a nucleating agent; and 0.10-3.00% of a lubricant. The invention also provides a preparation method of the foaming-grade polylactic acid with excellent processing fluidity. The adopting branching regulating agent not only can be subjected to chemical reaction with terminal hydroxyl of polylactic acid or terminal carboxyl of polylactic acid, but also can be subjected to free radical grafting reaction with polylactic acid under the initiation action of organic peroxide, so that a long-chain branching structure is introduced into a polylactic acid molecular chain; on the basis of keeping the excellent processing fluidity of the polylactic acid, the melt strength of the polylactic acid is greatly improved, so that the process requirements of continuous extrusion foaming, kettle pressure foaming, mold pressing foaming and injection molding foaming can be met, and excellent foamability is shown.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a foaming grade polylactic acid with excellent processing fluidity and a preparation method thereof. Background technique [0002] With the rise of the Internet economy (online shopping and takeaway industries, etc.), disposable plastic products have developed rapidly. However, the traditional disposable plastic packaging products have the disadvantages of non-degradability and high recycling cost, causing severe "white pollution" and causing serious damage to the earth's ecological environment, especially the marine ecosystem. Among them, polystyrene (PS) foam is one of the most important sources of pollution. This is due to the light weight of polystyrene foam products, high recycling costs, and difficulty in recycling. Most of the PS foam products are filled after use. Bury, incinerate or discard. In addition, traditional disposable plastic products are mainly deri...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K13/02C08K3/34C08K5/20C08K5/103C08K5/14C08K5/1515C08J9/12C08G63/91C08F283/02C08F212/14
CPCC08K13/02C08K3/346C08K5/20C08K5/103C08K5/14C08K5/1515C08J9/122C08J9/0095C08J9/0071C08J9/0028C08J9/0023C08G63/912C08F283/02C08J2367/04C08J2203/06C08J2203/08C08K2201/011C08L67/04C08F212/22
Inventor 李鹏张晓智詹卡斯
Owner SHANTOU SAMMA PLASTIC IND CO LTD