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Modified poly(lactic acid) and preparation method thereof

A polylactic acid modification technology, applied in the field of modified polylactic acid and its preparation, can solve problems such as degradation of polylactic acid, reduction of mechanical properties, complex process, etc.

Active Publication Date: 2011-10-26
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, high-temperature melt processing of polylactic acid will lead to severe degradation of polylactic acid and reduce other mechanical properties.
Simultaneously, add a large amount of third component zinc ion polymers, cause the complexity of technology and the rise of cost

Method used

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  • Modified poly(lactic acid) and preparation method thereof
  • Modified poly(lactic acid) and preparation method thereof
  • Modified poly(lactic acid) and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0028] The present invention also provides a preparation method of modified polylactic acid, comprising: a) premixing polylactic acid, ethylene-acrylate-glycidyl methacrylate copolymer, and a catalyst to obtain a resin composition; It is a tertiary amine or phosphorus catalyst; b) melting and kneading the resin composition at 160-200° C. to undergo a ring-opening reaction to obtain modified polylactic acid.

[0029] According to the present invention, taking N, N-dimethyl octadecylamine as an example, the reaction process of the present invention is as follows:

[0030]

[0031]Pre-mix E-MA-GMA, polylactic acid and catalyst at 150-180°C, the pre-mixing time is preferably 2-3 minutes, the purpose of pre-mixing is to fully mix the raw materials, and pre-plasticize, so that the reaction proceeds more smoothly full. According to the present invention, the equipment used for the premixing is preferably an internal mixer, an open mixer, and a high-speed mixer.

[0032] The prem...

Embodiment 1

[0035] In parts by weight, 15 parts of E-MA-GMA elastomer, 0.3 part of N, N-dimethylisopropanolamine and 85 parts of polylactic acid are taken. Polylactic acid, E-MA-GMA elastomer, N,N-dimethylisopropanolamine are premixed, and then melt blended in an internal mixer. The blending temperature is 180° C., the rotation speed is 80 r / min, and the mixing time is 5 min. And keep the temperature, rotational speed and mixing time constant throughout the experiment.

[0036] The impact resistance test of the modified polylactic acid prepared by the present invention is carried out on the XJU-22J type Izod impact testing machine manufactured by Chengde Testing Machine Factory. The average value of ten determinations was detected. The notched impact strength of the obtained material is 69.4kJ / m 2 .

Embodiment 2

[0038] In parts by weight, 20 parts of E-MA-GMA elastomer, 0.2 part of 4-amino-N, N-dimethylaniline and 80 parts of polylactic acid are taken. Polylactic acid, E-MA-GMA elastomer, 4-amino-N, N-dimethylaniline are premixed, and then melt blended in an internal mixer. The blending temperature is 180° C., the rotation speed is 80 r / min, and the mixing time is 5 min. And keep the temperature, rotational speed and mixing time constant throughout the experiment.

[0039] Detect the notched impact strength of the modified polylactic acid prepared in this embodiment according to the method of Example 1, and the notched impact strength of the obtained material is 80.8kJ / m 2 .

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Abstract

The invention provides modified poly(lactic acid), which is prepared by a reaction between poly(lactic acid) and an ethylene-acrylate-glycidyl methacrylate copolymer under the action of a catalyst, wherein the catalyst is a tertiary amine catalyst or a phosphorus catalyst. The catalyst used for the modified poly(lactic acid) provided by the invention improves the reaction efficiency and optimizesthe reaction conditions, so that an elastomer has smaller particle size in the matrix, more uniform particle size and stronger interfacial adhesion. Experiments show that the notched impact strength of the modified poly(lactic acid) provided by the invention is improved significantly, compared with the prior art. The invention also provides a preparation method of the modified poly(lactic acid).

Description

technical field [0001] The invention relates to the field of polymers and preparation methods thereof, in particular to a modified polylactic acid and a preparation method thereof. Background technique [0002] Among the many biodegradable polymer materials, polylactic acid (Polylactide, PLA) is considered to be the most promising one, and has attracted extensive attention from academia and industry in recent years. The raw materials for the synthesis of polylactic acid can be obtained on a large scale from bio-based materials-corn, straw and other crops, and the discarded polylactic acid can be completely decomposed into carbon dioxide and water under the action of microorganisms in nature. At the same time, polylactic acid also has many advantages such as high strength, good transparency, and good biocompatibility. Secondly, polylactic acid also has good processing performance, and can be processed by general processing methods, such as extrusion, injection molding, blow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08G63/91
Inventor 赵桂艳冯玉林姜伟殷敬华
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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