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Polylactic acid resin composition, process for producing the same and molding thereof

一种聚乳酸树脂、组合物的技术，应用在聚乳酸树脂组合物领域，能够解决不能充分改进耐热性、不能得到比例等问题，达到可靠获得、有效且获得的效果

Inactive Publication Date: 2008-12-31
TEIJIN LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, none of the methods described in Japanese Patent Publication (kokai) No. 2003-128900 and Japanese Patent Publication (Kokai) No. 2003-96285 can obtain sufficiently high stereoscopic crystals (stereocoordination) of poly-L-lactic acid and poly-D-lactic acid. crystal) ratio, and does not sufficiently improve heat resistance

Method used

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  • Polylactic acid resin composition, process for producing the same and molding thereof
  • Polylactic acid resin composition, process for producing the same and molding thereof
  • Polylactic acid resin composition, process for producing the same and molding thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Organicization of Layered Clay Minerals

[0087] 100 g of sodium montmorillonite (Kunipia F, manufactured by Kunimine Industries Co. Ltd., cation exchange capacity: 115 meq / 100 g) was dispersed in 5000 ml of water at 80° C.; 59.2 g of dihydroxyethylmethyl stearyl bromide Ammonium was dissolved in 2000ml of water at 80°C; subsequently, the two were mixed to carry out the organicization of montmorillonite; the organicized montmorillonite (hereinafter referred to as 18(OH) 2 -Mont) washed three times, freeze-dried, and crushed. 18(OH) determined by ignition method 2 -Mont has an inorganic residue of 63%.

[0088] Preparation of Polylactic Acid-Layered Clay Mineral Complex

[0089] 100g of L-lactide, 3.5g of 18(OH) 2 -Mont and 200 mg of tin octoate were added to the reactor and vacuumed to 10 -2 mmHg; then, the temperature was gradually raised while the mixture was fully stirred, and kept at 160°C for 1 hour; the reaction product was dissolved in chloroform and dropped i...

Embodiment 2-4

[0095] The DSC measurement of the film of the polylactic acid resin composition was carried out as described in Example 1, but the retention temperature {(A)°C} after melting was 120°C (Example 2), 100°C (Example 3) and 80°C ( Example 4). The obtained results are shown in Table 1.

Embodiment 5

[0097] Prepare the film of polylactic acid resin composition as described in Example 1, and measure on DSC, but difference is, by adding 0.5g of 18(OH) in the preparation step of polylactic acid-layered clay mineral combination 2 -Mont to obtain a PL-L-lactic acid-layered clay mineral combination (PLLA-clay #2) having a weight average molecular weight of about 120,000 and a layered clay mineral content of 0.3% by weight (based on the inorganic component), Use PLLA-clay #2 instead of PLLA-clay #1. The obtained results are shown in Table 1.

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PUM

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Abstract

The present invention provides a polylactic acid resin composition having a sufficiently high ratio of stereocrystals that can be obtained through selective crystallization into stereocrystals of poly-L-lactic acid and poly-D-lactic acid, a preparation method thereof and a polylactic acid resin composition obtained therefrom with Polylactic acid moldings with a sufficiently high proportion of three-dimensional crystals. The polylactic acid resin composition is characterized in that it comprises the following components: a polylactic acid / layered clay mineral material composed of layered clay minerals and one of poly-L-lactic acid and poly-D-lactic acid combined with the layered clay minerals and the other of poly-L-lactic acid and poly-D-lactic acid not bound to the layered clay mineral.

Description

technical field [0001] The present invention relates to a polylactic acid resin composition, its preparation method, and a molded article obtained by melt molding and crystallization thereof. Background of the invention [0002] Polylactic acid is decomposed under the action of microorganisms and biodegradation enzymes, and converted into lactic acid, carbon dioxide and water that are harmless to the human body. Therefore, polylactic acid has attracted people's attention as an alternative material for medical materials and general-purpose resins. Although polylactic acid is a crystalline resin, polylactic acid has a low crystallization rate and exhibits properties substantially similar to non-crystalline resins. That is, since polylactic acid softens rapidly, especially very rapidly around the glass transition temperature (generally, the modulus of elasticity is less than 1 / 100), it is difficult to obtain sufficient properties such as heat resistance, moldability, and mold ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K3/34C08K9/04C08L101/16C08J5/00C08G63/08C08K9/08
CPCC08G63/08C08K9/08C08L67/04C08L2666/18
Inventor 大内诚冈本浩孝中野充臼杵有光金森健志奥山久嗣山下征士影山裕史
Owner TEIJIN LTD
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