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Polylactic acid / polyurethane blend and preparation method thereof

A polyester polyurethane and polylactic acid technology, applied in the field of polylactic acid/polyurethane blends and polylactic acid blends, can solve the problems of high brittleness of polylactic acid, and achieve the effect of improving toughness and tensile fracture strain

Inactive Publication Date: 2013-05-15
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The basic concept and main technical structure of the present invention are as follows: Aiming at the shortcomings of existing polylactic acid with high brittleness, a PLA / PU blend suitable for preparing high toughness is provided

Method used

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  • Polylactic acid / polyurethane blend and preparation method thereof
  • Polylactic acid / polyurethane blend and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The PLA homopolymer is 2002D (Natureworks company), and the weight-average molecular weight of the PLA homopolymer is 200,000; the polyester polyurethane is provided by Shandong Yantai Wanhua Polyurethane Co., Ltd.

[0023] In terms of weight percentage, 99 parts of PLA homopolymer and 1 part of polyester polyurethane are uniformly mixed to obtain a mixture, and then the mixture is melt-blended with a twin-screw extruder at a temperature of 190-220°C to obtain PLA Blends with PU; the mechanical properties of the resulting PLA / PU blends can be found in figure 1 , 2 shown.

Embodiment 2

[0025] The PLA homopolymer is 2002D (Natureworks company), and the weight-average molecular weight of the PLA homopolymer is 200,000; the polyester polyurethane is provided by Shandong Yantai Wanhua Polyurethane Co., Ltd.

[0026] In terms of weight percentage, 95 parts of PLA homopolymer and 5 parts of polyester polyurethane are uniformly mixed to obtain a mixture, and then the mixture is melt-blended with a twin-screw extruder at a temperature of 190-220°C to obtain PLA Blends with PU; the mechanical properties of the resulting PLA / PU blends can be found in figure 1 , 2 shown.

Embodiment 3

[0028] The PLA homopolymer is 2002D (Natureworks company), and the weight-average molecular weight of the PLA homopolymer is 200,000; the polyester polyurethane is provided by Shandong Yantai Wanhua Polyurethane Co., Ltd.

[0029] In terms of weight percentage, 90 parts of PLA homopolymer and 10 parts of polyester polyurethane are uniformly mixed to obtain a mixture, and then the mixture is melt-blended with a twin-screw extruder at a temperature of 190-220°C to obtain PLA Blends with PU; the mechanical properties of the resulting PLA / PU blends can be found in figure 1 , 2 shown.

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Abstract

The present invention relates to a polylactide blend, especially a polylactic acid / polyurethane blend and a preparation method thereof. The method provided by the invention comprises steps of: evenly mixing 70- 99wt% of a polylactic acid homopolymer and 1-30 wt% of polyester type polyurethane to obtain a mixture; and then subjecting the mixture to melt blending extrusion, casting and granulating by a twin-screw extruder at 190-220 DEG C to obtain the polylactic acid / polyurethane blend provided by the invention. The polylactic acid / polyurethane blend provided by the invention has significantly increased toughness and tensile failure strain compared with pure PLA; meanwhile, the tensile strength of the blend only decreases a little compared with that of the pure PLA.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a polylactic acid blend, in particular to a polylactic acid (PLA) / polyurethane (PU) blend and a preparation method of the blend. Background technique [0002] Polylactic acid (PLA) is a biodegradable aliphatic polyester that can be synthesized from renewable crops and eventually degrades into CO 2 、H 2 O, etc., have little environmental pollution, so they have become the focus of research in recent years. It has good biocompatibility and is widely used in pharmaceutical industries such as drug carriers, bone fixation parts and surgical sutures. At the same time, it also has good mechanical properties and good thermoplastic processing performance. Therefore, it can replace traditional thermoplastics to a certain extent and be used in the production of plastic devices, films, and fibers. [0003] However, due to the strong hydrogen bond force between molecules and poor m...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L75/06B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/92B29C2948/92704B29C2948/92895
Inventor 宁炜邢倩张秀芹刘国明董侠王笃金
Owner INST OF CHEM CHINESE ACAD OF SCI
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