Method for preparing high molecular weight vertical structure composite polylactic acid with melt stability characteristics

A high-molecular-weight, composite technology, applied in the field of high-molecular-weight stereocomplex polylactic acid, can solve the problems of a large number of toxic reagents, low production efficiency, long time consumption, etc., and achieve the effect of excellent melt stability

Active Publication Date: 2014-08-06
TSD (BEIJING) MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using this method to prepare sc-PLA, a large amount of toxic reagents (such as dichloromethane, etc.) need to be used, and the process steps are many, time-consuming, and the production efficiency is low, so it is not easy to realize the preparation on an industrial scale

Method used

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  • Method for preparing high molecular weight vertical structure composite polylactic acid with melt stability characteristics
  • Method for preparing high molecular weight vertical structure composite polylactic acid with melt stability characteristics
  • Method for preparing high molecular weight vertical structure composite polylactic acid with melt stability characteristics

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The weight average molecular weight was 1×10 4 g·mol and 5×10 5 PLLA and PDLA with g mol and optical purity of 92% and 99.5% respectively were vacuum-dried at 50°C until the moisture content was lower than 200ppm under a vacuum degree of less than 900Pa; Completely dissolve in absolute ethanol, then stir and mix it with 60 parts of PLLA and 40 parts of PDLA; put the mixed material into the melting mixer of the torque rheometer, and melt at a temperature of 200 ° C and a rotor speed of 120 rpm Blend for 2 minutes to obtain powdered sc-PLA.

Embodiment 2

[0034] The weight average molecular weight was 2.1×10 5 g·mol and 1.2×10 5 PLLA and PDLA with g mol and optical purity of 98.5% and 99.5% respectively were vacuum-dried at 60°C until the moisture content was lower than 200ppm under a vacuum degree of less than 900Pa; Completely dissolve in absolute ethanol, then stir and mix it with 50 parts of PLLA and 50 parts of PDLA; put the mixed material into the melting mixer of the torque rheometer, and melt at a temperature of 180 ° C and a rotor speed of 60 rpm Blend for 5 minutes to obtain powdered sc-PLA.

Embodiment 3

[0036] The weight average molecular weight was 2.1×10 5 g·mol and 1.2×10 5PLLA and PDLA with g mol and optical purity of 98.5% and 99.5% respectively were vacuum-dried at 60°C until the moisture content was lower than 200ppm under a vacuum degree of less than 900Pa; Completely dissolve in absolute ethanol, then stir and mix it with 50 parts of PLLA and 50 parts of PDLA; put the mixed material into the melting mixer of the torque rheometer, and melt at a temperature of 180 ° C and a rotor speed of 50 rpm After blending for 7 minutes, powdered sc-PLA was obtained.

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Abstract

The invention discloses a method for preparing a high molecular weight vertical structure composite polylactic acid with melt stability characteristics. The method comprises the following steps: firstly, carrying out drying treatment on L-polylactide and dextral polylactic acid in vacuum, and then mixing an initiator which can be completely dissolved into absolute ethyl alcohol with a cross-linking agent, and then adding a mixture to a fusion mixer; melting and blending under the conditions that the temperature is 170-200 DEG C and the rotating speed is 20-120 rpm (revolutions per minute) for 2-15 minutes. The prepared high molecular weight vertical structure composite polylactic acid not only has excellent melt stability, but also has strong recrystallization ability, and can ensure that the vertical structure composite polylactic acid crystal with high purity and high content is reformed in a molten product, so as to provide excellent heat resistance and weather fastness to the product. The possibility is also provided for preparation of a PLA product with high performance by virtue of a melt processing technology. Meanwhile, the preparation method provided by the invention is simple in process, high in efficiency, and easy for realization of large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid preparation, and in particular relates to a method for preparing high-molecular-weight stereocomplex polylactic acid with melt stability characteristics by adopting melt blending-solid-state micro-crosslinking technology. Background technique [0002] In recent decades, the rapid development of polymer materials has provided great convenience for human life. However, with the increasing shortage of petroleum resources and the increasing environmental pollution caused by waste plastics, the development of renewable resources as raw materials and biodegradable polymer materials to replace traditional petroleum-based polymers has attracted a lot of attention from the global academic and industrial circles. world's high attention. [0003] Polylactic acid (PLA) is a bio-based biodegradable polymer material with the most development potential. At present, its cost has been greatly reduced wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L67/04C08K5/3492C08K5/29
Inventor 白红伟傅强张琴陈枫王柯邓华
Owner TSD (BEIJING) MEDICAL TECH CO LTD
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