Polylactic acid composition, and production method and production apparatus of the same

A manufacturing method and polylactic acid technology are applied in the field of polylactic acid composition to achieve the effect of high molecular weight and high strength

Inactive Publication Date: 2015-11-18
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this melt-kneading method, there is a problem that application of kneading pressure (partial (shear, share)) causes occurrence of ring-opening polymerizable monomer residues or thermal decomposition of the resulting polymer, so that the resulting polymer contains Large amounts of ring-opening polymerizable monomer residues

Method used

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  • Polylactic acid composition, and production method and production apparatus of the same
  • Polylactic acid composition, and production method and production apparatus of the same
  • Polylactic acid composition, and production method and production apparatus of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0218] pass image 3 The polymerization reactor 100 performs ring-opening polymerization of L-lactide. The configuration of the polymerization reactor 100 is as follows.

[0219] (1) Tank 1 and metering feeder 2 (piston pump NP-S462, product of Nihon Seimitsu Kagaku Co., Ltd.):

[0220] Tank 1 was charged with a mixture of L-lactide (product of Purac, melting point: 100° C.) serving as a ring-opening polymerizable monomer and ethylene glycol (99:1 molar ratio) serving as a polymerization initiator. Note that in Tank 1, lactide is allowed to become liquid by heating it to a temperature equal to or higher than its melting point. To 100 parts by mass of lactide, 10 parts by mass of talc (SG-95, product of NIPPONTALC Co., Ltd.) serving as a nucleating agent was added.

[0221] (2) Tank 3 and metering feeder 4: not used in this example.

[0222] (3) Tank 5 and metering pump 6: not used in this embodiment.

[0223] (4) Tank 7: A carbon dioxide gas cylinder (gas cylinder) was us...

Embodiment 2-9 and comparative example 1-5

[0259] The polylactic acid compositions of Examples 2-9 and Comparative Examples 1-5 were manufactured in the same manner as in Example 1, except that the types and amounts of nucleating agents and crystallization accelerators, and polymerization initiation were changed according to the following Tables 1 to 3. dose.

[0260] Properties of the obtained polylactic acid composition were evaluated in the same manner as in Example 1. The results are shown in Tables 1 to 3.

Embodiment 10

[0262] The polylactic acid composition of Example 10 was produced in the same manner as in Example 1, except that the type of catalyst was changed to DBU according to the following Table 2, and the temperature of the delivery path of the biaxial stirring device was set to be between the inlet and the outlet. Both were at 80°C, and the respective types of nucleating agent and crystallization accelerator and the amount of polymerization initiator were changed.

[0263] Properties of the resulting polylactic acid composition of Example 10 were evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0264] Table 1

[0265]

[0266] Table 2

[0267]

[0268] table 3

[0269]

[0270] The materials described in Tables 1 to 3 will be specifically described.

[0271] *Talc: SG-95, a product of NIPPONTALC Co.,Ltd.

[0272] *Kaolin: SATINTONE No.5, product of TAKEHARAKAGAKUKOGYO CO.,LTD.

[0273] * Phosphate ester metal salt compound: ADEKASTABNA...

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Abstract

To provide a polylactic acid composition, containing: polylactic acid, wherein the polylactic acid composition contains a ring-opening polymerizable monomer residue in a concentration of 100 ppm by mass to 5,000 ppm by mass, and wherein the polylactic acid composition has a weight average molecular weight of 100,000 or more but less than 300,000 as measured by gel permeation chromatography, a yellow index (YI) value of 5 or less, and a Charpy impact strength of 10 kJ / m2 or more.

Description

technical field [0001] The present invention relates to a polylactic acid composition, a method for producing the polylactic acid composition, and a production facility for the polylactic acid composition. Background technique [0002] Production of polymers by ring-opening polymerization of ring-opening polymerizable monomers is a conventionally known method. For example, there has been proposed a method of producing polylactic acid by allowing a polymerization raw material containing lactide as a main component to react in a molten state to perform polymerization (see PTL 1). According to this proposed method, using tinoctylate as a catalyst and setting the reaction temperature at 195° C., lactide is reacted in a molten state to be polymerized. [0003] However, when polylactic acid is produced by this proposed method, the resulting polylactic acid contains more than 2% by mass of lactide residues. This is because the equilibrium relationship between the ring-opening pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08G63/78C08K3/34C08K5/521C08L101/16
CPCC08G63/785C08G63/08C08G63/78C08K3/34C08K5/521C08L67/04C08L101/16C08K5/0083C08K5/09C08K3/346
Inventor 根本太一田中千秋
Owner RICOH KK
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