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Polylactide-based blended material, preparation method thereof and method for preparing foam material from polylactide-based blended material

A technology of polylactic acid-based and foamed materials, which is applied in the field of polylactic acid-based blended materials and its preparation, can solve the problem of incomplete biodegradation of foamed PLA materials, difficulty in controlling cell structure and size, and residual chemical foaming agents, etc. problem, to achieve the effect of easy control of cell density, high reproducibility and low production cost

Active Publication Date: 2015-11-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foamed PLA materials are mainly prepared by chemical foaming agents, which are prone to cell merging and collapse, resulting in large and uneven cell sizes. Addition of other additives may make the foamed PLA material not fully biodegradable; in addition, when linear PLA is used for foaming, low melt strength affects its foaming performance to a large extent, and it is difficult to control the cells structure and size

Method used

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  • Polylactide-based blended material, preparation method thereof and method for preparing foam material from polylactide-based blended material
  • Polylactide-based blended material, preparation method thereof and method for preparing foam material from polylactide-based blended material
  • Polylactide-based blended material, preparation method thereof and method for preparing foam material from polylactide-based blended material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] PLA and TPU with a mass ratio of 80:20 and Joncryl with a mass content of 0.25% were mechanically mixed, and then the premix was added to a chaotic mixing type extruder for melt reaction blending to prepare PLA / TPU reactive blends. mix materials. The screw speed of the extruder is 40r / min, and the barrel temperature is 150-190°C.

[0053] The test results: the impact strength, tensile strength and elongation at break of the PLA / TPU reactive blend material are 69.2kJ / m 2 , 36.5MPa and 272.6%.

Embodiment 2

[0055] PLA and TPU with a mass ratio of 80:20 and Joncryl with a mass content of 0.5% were mechanically mixed, and then the premix was added to a chaotic mixing type extruder for melt reaction blending to prepare PLA / TPU reactive blends. mix materials. The screw speed of the extruder is 40r / min, and the barrel temperature is 150-190°C.

[0056] The test results: the impact strength, tensile strength and elongation at break of the PLA / TPU reactive blend material are 73.5kJ / m 2 , 38.0MPa and 375.4%.

Embodiment 3

[0058] PLA and TPU with a mass ratio of 80:20 and Joncryl with a mass content of 0.75% were mechanically mixed, and then the premix was added to a chaotic mixing extruder for melt reaction blending to prepare PLA / TPU reactive blends. mix materials. The screw speed of the extruder is 40r / min, and the barrel temperature is 150-190°C.

[0059] The test results: the impact strength, tensile strength and elongation at break of the PLA / TPU reactive blend material are 78.3kJ / m respectively 2 , 38.5MPa and 376.0%.

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Abstract

The invention discloses a polylactide-based blended material, a preparation method thereof and a method for preparing a foam material from the polylactide-based blended material. The mass ratio of PLA to an elastomer in main components of the blended material is (70-90):(30-10), and the mass percentage of a chain extender is 0.2-2.0% calculated according to the fact that the mass sum of PLA and the elastomer is 100%. The preparation method of the blended material comprises the following steps: mechanically mixing PLA, the elastomer and the chain extender according to the ratio to form a premix; then, placing the premix into an extruder; and reacting and carrying out melt blending to obtain the polylactide-based blended material. According to the preparation method of the foam material, the prepared polylactide-based blended material is placed in a high-pressure kettle cavity and is foamed through introducing a supercritical fluid, or the prepared polylactide-based blended material is added into an injection molding machine or extruder and is foamed through introducing the supercritical fluid. The blended material prepared by using the preparation method not only has very high toughness, but also remains the original strength of a polylactic acid material.

Description

technical field [0001] The invention relates to the technical field of polymer materials and their preparation, in particular to a polylactic acid-based blend material and a preparation method thereof, as well as a method for preparing foamed materials therefrom. Background technique [0002] At present, efforts are being made to prepare biodegradable green polymer materials from renewable resources. Polylactic acid (PLA) is a green biodegradable material that can replace traditional petroleum-based polymer materials in many applications due to its higher strength. However, the inherent brittleness of PLA limits its application range. [0003] PLA can be modified by methods such as copolymerization and blending to improve its toughness. Among them, the process of copolymerization modification is complicated, the efficiency is low, and the cost of the monomer used is high. Blending elastomer directly with PLA is a simple and effective method to improve its toughness, but i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L75/04
Inventor 黄汉雄赵翡
Owner SOUTH CHINA UNIV OF TECH
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