Toughened polylactic acid composite material and preparation method thereof

A composite material and polylactic acid technology, applied in the field of toughened polylactic acid composite material and its preparation, can solve problems such as non-uniformity and stability, and achieve the effects of improving compatibility, excellent comprehensive performance, and increasing thermal deformation temperature

Active Publication Date: 2020-09-11
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polylactic acid and polycarbonate are not compatible and cannot form a relatively uniform and stable phase. This can be seen from some other indicators of mechanical properties, especially the notched impact strength, which is far lower than the relevant industrial standards

Method used

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  • Toughened polylactic acid composite material and preparation method thereof
  • Toughened polylactic acid composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare materials according to the following parts by weight: 37 parts of polylactic acid PLA, 58 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PCTG), 3 parts of compatibilizer, 0.2 part of antioxidant .

[0029] The above-mentioned raw materials are put into a high mixer and mixed evenly to obtain a premixed material. Then the premixed material is added into a twin-screw extruder, melted and extruded to granulate, the screw temperature of each section of the twin-screw extruder is controlled between 180-210°C, and the screw speed is 500 rpm. The obtained particles were dried at 60°C for 6 hours to obtain the finished material.

Embodiment 2

[0031] Prepare materials according to the following parts by weight: 37 parts of polylactic acid PLA, 58 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PCTG), 5 parts of compatibilizer, 0.2 part of antioxidant .

[0032] The above-mentioned raw materials are put into a high mixer and mixed evenly to obtain a premixed material. Then the premixed material is added into a twin-screw extruder, melted and extruded to granulate, the screw temperature of each section of the twin-screw extruder is controlled between 180-210°C, and the screw speed is 500 rpm. The obtained particles were dried at 60°C for 6 hours to obtain the finished material.

Embodiment 3

[0034] Prepare materials according to the following parts by weight: 36 parts of polylactic acid PLA, 57 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PCTG), 7 parts of compatibilizer, and 0 part of toughening agent , 0.2 parts of antioxidant.

[0035] The above-mentioned raw materials are put into a high mixer and mixed evenly to obtain a premixed material. Then the premixed material is added into a twin-screw extruder, melted and extruded to granulate, the screw temperature of each section of the twin-screw extruder is controlled between 180-210°C, and the screw speed is 500 rpm. The obtained particles were dried at 60°C for 6 hours to obtain the finished material.

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Abstract

The invention discloses a toughened polylactic acid composite material and a preparation method thereof, and the toughened polylactic acid composite material comprises the following raw materials by weight: 20-80 parts of polylactic acid (PLA), 20-80 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol ester (PCTG), 0-9 parts of a compatilizer, 0-5 parts of a toughening agent, and 0.1-0.5part of an antioxidant; wherein the polylactic acid comprises L-lactic acid and D-lactic acid; the average molecular weight is 207 kDa; the relative density ranges from 1.20-1.30 g/cm3; and the melting temperature is 200-220 DEG C. The toughened polylactic acid composite material has excellent comprehensive properties, effectively improves the compatibility of PLA and PCTG, greatly enhances the notch impact strength and toughness, enhances the thermal deformation temperature, and can be industrially applied to some specific packaging materials and container materials.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a toughened polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid is the most widely studied and used biodegradable and renewable thermoplastic polyester, and has the potential to replace traditional petrochemical-based polymers. Over the past few decades, polylactic acid and its copolymers have attracted widespread attention in the environmental, biomedical, and pharmaceutical fields because of their potential as an alternative to petroleum-based polymers. Generally, polylactic acid uses glucose, a carbohydrate in crops, as a raw material. Commonly used crops include corn, potatoes, and sorghum. Among the applications used as substitutes for petroleum-based polymers, the field of packaging engineering is the most widely used. However, in the practical application of the engineering field, the br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L67/04C08L51/06C08L25/14C08K5/134C08K5/526
CPCC08L67/02C08L2205/02C08L2205/035C08L2205/08C08L67/04C08L51/06C08L25/14C08K5/1345C08K5/526
Inventor 徐群杰宋红江陈晓东范金辰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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