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Preparation method for hyperbranched polyurethane, modified polylactic resin, and preparation method for modified polylactic resin

A technology of hyperbranched polyurethane and polylactic acid resin, applied in the field of biomass materials, can solve the problems of low elongation at break, hindering the development and application of polylactic acid, and high brittleness

Inactive Publication Date: 2012-07-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current commercialized polylactic acid has low melt strength, high brittleness, insufficient toughness, and low elongation at break, which have become key technical problems hindering the development and application of polylactic acid.

Method used

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  • Preparation method for hyperbranched polyurethane, modified polylactic resin, and preparation method for modified polylactic resin
  • Preparation method for hyperbranched polyurethane, modified polylactic resin, and preparation method for modified polylactic resin
  • Preparation method for hyperbranched polyurethane, modified polylactic resin, and preparation method for modified polylactic resin

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preparation example Construction

[0028] The invention discloses a preparation method of modified polylactic acid resin, which comprises the following steps: under the protection of nitrogen, mix castor oil and diisocyanate in a molar ratio (1-5): 1, heat up to 60-90°C, and react Finally, hyperbranched polyurethane is obtained; polylactic acid and the hyperbranched polyurethane are mixed according to the mass ratio (80-98): (2-20), and the modified polylactic acid resin is obtained after melt blending.

[0029] In the above-mentioned process of preparing modified polylactic acid resin, the present invention first utilizes chemical method to prepare hyperbranched polyurethane, because hyperbranched polyurethane is polymerized by castor oil and diisocyanate, thus it melts and blends with polylactic acid, hyperbranched polyurethane Polyurethane introduces hyperbranched structure, cross-linked structure and a large number of hydrogen bonds into the polylactic acid system, which can effectively improve the comprehen...

Embodiment 1

[0052] (1) Preparation of hyperbranched polyurethane

[0053] Under the protection of nitrogen, mix castor oil and MDI at a molar ratio of 5:1, heat up to 80°C, stir mechanically, and react for 10 hours. After the reaction is complete, dry under reduced pressure for 2 hours to obtain a colorless and transparent viscous liquid that is overrun Polyurethane;

[0054] (2) Hyperbranched Polyurethane Modified Polylactic Acid Resin

[0055] Provide polylactic acid, said polylactic acid has a molecular weight of 90.6kg, a molecular weight distribution width of 1.24, and a melting point of 170.6°C, fully dried;

[0056] Polylactic acid is mixed with the hyperbranched polyurethane prepared above, and the addition ratio (mass ratio) of the hyperbranched polyurethane is controlled to be 2%, 5%, and 10% respectively, that is, polylactic acid 98%, hyperbranched polyurethane 2%; polylactic acid 95%, hyperbranched polyurethane 5%; polylactic acid 90%, hyperbranched polyurethane 10%; the mix...

Embodiment 2

[0061] (1) Preparation of hyperbranched polyurethane

[0062] Under nitrogen protection, mix castor oil and MDI at a molar ratio of 5:2, heat up to 85°C, stir mechanically, and react for 20 hours. After the reaction is complete, dry under reduced pressure for 2 hours to obtain a colorless and transparent viscous liquid that is overrun Polyurethane;

[0063] (2) Hyperbranched Polyurethane Modified Polylactic Acid Resin

[0064] Provide polylactic acid, said polylactic acid has a molecular weight of 90.6kg, a molecular weight distribution width of 1.24, and a melting point of 170.6°C, fully dried;

[0065] Polylactic acid is mixed with the hyperbranched polyurethane prepared above, and the addition ratio (mass ratio) of the hyperbranched polyurethane is controlled to be 5%, 10%, and 15% respectively, that is, polylactic acid 95%, hyperbranched polyurethane 5%; polylactic acid 90%, hyperbranched polyurethane 10%; polylactic acid 85%, hyperbranched polyurethane 15%;

[0066] Th...

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Abstract

The invention discloses a preparation method for hyperbranched polyurethane. The method comprises the following steps of: mixing castor oil and diisocyanate in a molar ratio of (1-5):1 under the protection of nitrogen, raising temperature to 60 to 90 DEG C, and reacting to obtain the hyperbranched polyurethane. The preparation method for the hyperbranched polyurethane has the characteristics of simplicity, low cost, and adjustable molecular weight. The invention also provides modified polylactic resin and a preparation method thereof. A biomass material castor oil is used as the raw material, the degradable hyperbranched polyurethane prepared by a chemical method is used for modified polylactic acid, and the biodegradability of the modified polylactic acid can be guaranteed. The hyperbranched polyurethane is obtained by polymerizing the caster oil and diisocyanate, and hyperbranched structures, cross-linked structures and a large amount of hydrogen bonds are introduced by the hyperbranched polyurethane in a polylactic acid system in a melt blending process of the polylactic acid, so the mechanical property, the processability and compatibility of the polylactic acid are improved effectively.

Description

technical field [0001] The invention relates to the technical field of biomass materials, and more specifically, relates to a preparation method of hyperbranched polyurethane, a modified polylactic acid resin and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, the increasingly prominent environmental pollution and energy crisis have become the focus of attention in the world. The development of environmentally friendly bio-based polymer materials has become a strategic requirement to ensure a virtuous cycle of the ecological chain and achieve sustainable development. Therefore, biodegradable polymers Materials have become a hot topic in research and development today. Among many biodegradable polymer materials, polylactic acid is the most cost-effective, and it is the first environmentally friendly plastic to achieve mass industrialization. Polylactic acid has the characteristics of non-polluting production process, renew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08L67/04C08L75/14
Inventor 陈学思黄绍永张宝李杲庄秀丽
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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