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Solid poly(lactic acid) composition and production method therefor

A solid composition and production method technology, applied in the field of polylactic acid solid composition, can solve the problems of high cost, reduce the molecular weight of the refractory resin, reduce the molecular weight cost, etc. The effect of the processability advantage

Pending Publication Date: 2021-11-12
TOYO SEIKAN GRP HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is necessary to use easily hydrolyzable polymers such as polyoxalate with high cost as the ester decomposition accelerator (B)
Thus, using this technique to modify polylactic acid by, for example, lowering the molecular weight becomes problematic in terms of cost
In addition, since the ester decomposition accelerator (C) in the technology of Patent Document 2 is used to promote the hydrolysis of the ester decomposition accelerator (B), Patent Document 2 does not give whether the assistant (C) helps to reduce the difficulty of hydrolysis. Resin molecular weight considerations

Method used

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  • Solid poly(lactic acid) composition and production method therefor
  • Solid poly(lactic acid) composition and production method therefor
  • Solid poly(lactic acid) composition and production method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0100] High molecular weight PLA and sodium carbonate were quantitatively fed to a continuous twin-screw extruder through respective quantitative feeders so that the mass ratio (PLA:sodium carbonate) was 9:1, followed by melt kneading at 220°C for 3 minutes. Then, the melt-kneaded product was extruded to obtain pellets of the polylactic acid solid composition.

[0101] The weight average molecular weight (Mw) of PLA contained in the pellets was measured by the aforementioned method. The weight average molecular weight (Mw) was 35,000.

[0102] The weight average molecular weight distribution curve is shown in figure 1 middle.

[0103] In addition, the content of sodium carbonate particles in the pellets was 7.4% by mass. The average particle diameter of the sodium carbonate particles was 1.5 μm.

[0104] figure 2 shows a SEM photograph of sodium carbonate, and image 3 A SEM photograph of sodium carbonate, a reagent used as a raw material, is shown.

[0105] The obtain...

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Abstract

A solid poly(lactic acid) composition characterized by comprising poly(lactic acid) having a weight-average molecular weight in terms of polystyrene, as determined by GPC, of 40,000 or less and a basic compound of an alkali metal or alkaline-earth metal, which is a residue of an accelerator for molecular-weight reduction, and by containing the basic compound in an amount of 0.5-20 mass%.

Description

technical field [0001] The invention relates to a polylactic acid solid composition and a production method thereof. More specifically, the present invention relates to a polylactic acid solid composition, which has improved crushability, contains low molecular weight polylactic acid as a polymer component, and can be used as a fine granule; and a production method thereof. Background technique [0002] Polylactic acid is known as an environmentally friendly biodegradable resin, and is used in various applications. [0003] Recently, the use of polylactic acid in a method of soil purification using microorganisms (called bioremediation) has been proposed. Lactic acid produced by hydrolysis of polylactic acid is used as a nutrient source for microorganisms. Thus, by spraying polylactic acid to saturate the soil with it, the reproduction and activity of microorganisms can be promoted. [0004] For example, Patent Document 1 discloses a polylactic acid-based resin in a solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J3/12C08K3/105C08K3/26
CPCC08K3/26C08K2003/262C08G63/08C08J3/201C08J2367/04C08J2300/12C08L67/04C08K3/105
Inventor 片山传喜吉川成志柴田幸树
Owner TOYO SEIKAN GRP HLDG LTD