Polylactic acid-modified polycarbodiimide compound, polylactic acid resin composition containing same and molded article

A technology of polycarbodiimide and polylactic acid resin, which is applied in the field of polycarbodiimide compounds, can solve problems such as lack of uniformity, achieve excellent hydrolysis resistance, improve mechanical properties, and enhance the effect of entanglement

Inactive Publication Date: 2009-03-04
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may be due to the lack of uniformity in the polylactic acid resin composition, and the low-strength polycarbodiimide phase dispersed in the composition increases

Method used

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  • Polylactic acid-modified polycarbodiimide compound, polylactic acid resin composition containing same and molded article
  • Polylactic acid-modified polycarbodiimide compound, polylactic acid resin composition containing same and molded article
  • Polylactic acid-modified polycarbodiimide compound, polylactic acid resin composition containing same and molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0066] The invention will be described below with reference to specific examples. The physical properties described in the examples were measured and evaluated by the following methods.

[0067] (1) Hydrolysis resistance

[0068] The produced pellets of the resin composition were kept for a given time in an atmosphere comprising a temperature of 80° C. and a humidity of 95 RH%. The change in number average molecular weight was measured using GPC (Gel Permeation Chromatography). The hydrolysis resistance was evaluated according to the following criteria:

[0069] ○ (good): The initial number average molecular weight is maintained even after 150 hours have elapsed.

[0070] × (poor): Decomposition proceeded after 150 hours had elapsed, and the initial number average molecular weight could not be maintained.

[0071] (2) Compatibility

[0072] The pellets of the produced resin composition were placed on a slide glass heated to 200°C. After dissolution, the resin was covered...

manufacture example 1

[0077] Production Example 1 (Production 1 of polylactic acid for production of polylactic acid-modified polycarbodiimide; raw material: lactic acid)

[0078] Put L-lactic acid (a primary chemical) in a flask equipped with a stirrer and a cooling tube, and perform a dehydration reaction under reduced pressure at 150° C. for 6 hours, and discharge the generated water from the system. The resulting reaction mass was precipitated using hexane to obtain polylactic acid ((oligomer)) having a number average molecular weight of 300-500. Herein, the number average molecular weight was determined by determining the number of terminal carboxylic acids.

manufacture example 2

[0079] Production Example 2 (Production 2 of polylactic acid for production of polylactic acid-modified polycarbodiimide; raw material: lactide)

[0080] L-lactide (a primary chemical) and 150 ppm of tin octoate (relative to L-lactide) were added to a flask equipped with a stirrer and a cooling tube, and polymerization was performed at 190°C in a nitrogen atmosphere. Adjust the reaction time to obtain polylactic acid with different molecular weights. Its molecular weight, determined by determining the number of terminal carboxylic acids, falls within the range of 1,000-20,000.

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Abstract

Disclosed is a polylactic acid-modified polycarbodiimide compound which is blended with a polylactic acid resin for imparting hydrolysis resistance thereto while improving mechanical characteristics thereof. Also disclosed are a polylactic acid resin composition containing such a polylactic acid-modified polycarbodiimide compound, and a molded article.

Description

technical field [0001] The present invention relates to a polylactic acid-modified polycarbodiimide compound, a polylactic acid resin composition and a molded article containing the compound. More specifically, the present invention relates to a polycarbodiimide compound having improved compatibility with a polylactic acid resin through linkage of polylactic acid. The present invention also relates to a polylactic acid resin composition and molded article comprising the compound and having excellent hydrolysis resistance and mechanical properties. Background technique [0002] In recent years, plant-derived resins have attracted attention as a substitute for petroleum raw materials, and resin compositions obtained using various plant-derived resins have been actively studied for their practical use. In particular, polylactic acid resins have attracted attention as an example of using plant-derived resins, and are being commercialized in various applications. The applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08L67/04C08L79/00C08L101/16
CPCC08L79/00C08L87/005C08L67/04C08L2666/02C08L2666/18
Inventor 田中修吉木内幸浩位地正年
Owner NEC CORP
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