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Biodegradable blend material for improving crystallinity of polylactic acid and preparation method thereof

A technology of biodegradation and polylactic acid, which is applied in the field of biodegradable blended materials and their preparation, can solve the problems of complex operation process and high cost, and achieve the effects of simple process, low product cost and reduction of white pollution.

Pending Publication Date: 2020-12-11
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Published Patent No. CN 108707323 A patent application for invention, which discloses a preparation method of PLA / PPC / HBP derivative blend, which uses HBP hyperbranched copolymer to increase the compatibility of PLA and PPC two materials, But the operation process is complicated and the cost is high

Method used

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  • Biodegradable blend material for improving crystallinity of polylactic acid and preparation method thereof
  • Biodegradable blend material for improving crystallinity of polylactic acid and preparation method thereof
  • Biodegradable blend material for improving crystallinity of polylactic acid and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Polylactic acid 60 parts

[0038] Polypropylene carbonate 40 parts

[0039] 1 part maleic anhydride

[0040] Tetrabutyl titanate 1 part

[0041] The specific implementation steps are as follows:

[0042] (1) Dry the polypropylene carbonate, then evenly mix it with maleic anhydride and add it to the twin-screw extruder, set the heating temperature to 130°C, and the rotation speed to 50 rpm, take out the material, dry it, and set it aside;

[0043] (2) Evenly mix the polypropylene carbonate weighed in (1) with the dried polylactic acid and tetrabutyl titanate into the twin-screw extruder, set the heating temperature to 180°C, and the speed to 45 rpm ,Reclaimer.

[0044] The material was subjected to DSC thermal performance test, the results are as follows:

[0045] Crystallinity 8.19%

Embodiment 2

[0047] Polylactic acid 70 parts

[0048] Polypropylene carbonate 30 parts

[0049] 1 part maleic anhydride

[0050] Tetrabutyl titanate 2 parts

[0051] The specific implementation steps are as follows:

[0052] (1) Dry the polypropylene carbonate, then mix it evenly with maleic anhydride and add it to the twin-screw extruder, set the heating temperature to 135°C, and the rotation speed to 55 rpm, take out the material, dry it, and set it aside;

[0053] (2) Evenly mix the polypropylene carbonate weighed in (1) with the dried polylactic acid and tetrabutyl titanate into the twin-screw extruder, set the heating temperature to 180°C, and the speed to 50 rpm ,Reclaimer.

[0054] The material was subjected to DSC thermal performance test, the results are as follows:

[0055] Crystallinity 20.04%

Embodiment 3

[0057] Polylactic acid 70 parts

[0058] Polypropylene carbonate 30 parts

[0059] 2 parts dicumyl peroxide

[0060] Tetrabutyl titanate 3 parts

[0061] The specific implementation steps are as follows:

[0062] (1) Dry polypropylene carbonate, then evenly mix it with dicumyl peroxide and add it to the twin-screw extruder, set the heating temperature to 130°C, and the speed to 55 rpm, take out the material, dry it, and set it aside ;

[0063] (2) Evenly mix the polypropylene carbonate weighed in (1) with the dried polylactic acid and tetrabutyl titanate into the twin-screw extruder, set the heating temperature to 175°C, and the speed to 50 rpm ,Reclaimer.

[0064] The material was subjected to DSC thermal performance test, the results are as follows:

[0065] Crystallinity 19.64%

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Abstract

The invention discloses a biodegradable blend material capable of improving crystallinity of polylactic acid and a preparation method thereof, and relates to a biodegradable blend material and a preparation method thereof. The biodegradable blend material comprises the following raw materials: 60-90 parts of polylactic acid; 10-40 parts of polypropylene carbonate; 1-5 parts of an end-capping reagent; and 1-5 parts of a compatibilizer. The preparation method comprises the following steps of: 1, carrying out end-capping treatment on an end-capping agent and polypropylene carbonate in a double-screw extruder; and 2, blending polylactic acid, polypropylene carbonate obtained in the step 1 and a compatibilizer in a double-screw extruder to obtain the high-crystallinity PLA / PPC blend material. The blend material has better compatibility, avoids the problem of matrix migration caused by poor compatibility, has higher crystallinity than a single polylactic acid material, and enhances the processing and forming properties of polylactic acid. According to the preparation method, the crystallization capacity of polylactic acid is effectively improved, meanwhile, the characteristic of completebiodegradation is reserved, and the preparation method has a wide application prospect.

Description

technical field [0001] The invention relates to a biodegradable blended material and a preparation method thereof, in particular to a biodegradable blended material which improves the crystallinity of polylactic acid and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a non-toxic, fully biodegradable and renewable semi-crystalline polymer, which is widely used in biomedicine, textile, packaging and other fields. However, PLA has limited its further promotion and application due to its slow crystallization rate, low crystallinity, poor impact resistance and elongation at break. [0003] PPC has the advantages of high elongation at break and good flexibility, and is synthesized using propylene oxide and "greenhouse gas" CO 2 As a raw material, it alleviates the problems of greenhouse effect and white pollution. For this reason, the method of blending PPC and PLA can be used to improve the crystallization ability and toughness of PLA. How...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L69/00C08K5/10C08K5/29
CPCC08L67/04C08L2201/06C08L2205/08C08L2205/24C08L69/00C08K5/10C08K5/29
Inventor 宋立新李永超孟祥宇史颖王元霞刘立志
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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