Process for production of polylactic acid

A manufacturing method, polylactic acid technology, applied in chemical instruments and methods, chemical/physical/physicochemical processes, chemical/physical processes, etc., can solve the problems of low heat resistance and low rigidity, and achieve low-cost effects

Active Publication Date: 2012-05-16
UHDE INVENTA FISCHER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems of low heat resistance and low rigidity, so it is only practically used in a limited range

Method used

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  • Process for production of polylactic acid
  • Process for production of polylactic acid
  • Process for production of polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0181] (Example 1: Production of poly-L-lactic acid)

[0182] 600kg of L-lactide (manufactured by Musashino Chemical Research Institute Co., Ltd.), 30g of tin octoate (manufactured by Wako Pure Chemical Industries, Ltd.), and 1500g of lauryl alcohol (manufactured by Wako Pure Chemical Industries, Ltd.) were charged into 1000L pretreatment Tank, at 40°C, 1.33×10 3 Dry under Pa (10mmHg) for 30 minutes. Next, the decompression was released and replaced with nitrogen gas with a purity of 99.999% by mass. This decompression operation and nitrogen replacement operation were repeated three times as pretreatment. The water content of the pretreated L-lactide was 20 ppm.

[0183] Then, the feeder is used to cover the nitrogen gas with a purity of 99.999% by mass at a speed of 11.8kg / h, such as Figure 7 The lactide melting tank with a capacity of 15 L equipped with MaxBlend (registered trademark) blades shown above supplies the above-mentioned L-lactide. While melting L-lactide, i...

Embodiment 2

[0184] (Example 2: Synthesis of Stereocomplex Polylactic Acid Block Copolymer)

[0185]

[0186] In place of L-lactide, D-lactide (manufactured by Musashino Chemical Research Institute Co., Ltd.) was used, except that the amount of lauryl alcohol used was 5400 g, and poly-D was produced by the same method as in Example 1. - Lactic acid. use as figure 2 The shape shown is a 16.8 L capacity reactor with plug flow. The ξ(τ) of each of the first reactor, the second reactor, and the third reactor was 0.28, and the ξ(τ) of the entire reaction system was 0.16. After reaching a steady state, the poly-D-lactic acid obtained from the third reactor was stored in a polymer melting vessel previously replaced with nitrogen with a purity of 99.999% by mass, and a heat medium at 200° C. was circulated in the jacket. The lactide conversion rate of the obtained poly-D-lactic acid was 95.9%, Mw was 56,850, Mn was 36,850, and the molecular weight distribution was 1.54. Moreover, the yellow...

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Abstract

Provided is a process for the production of polylactic acid, by which a high-molecular-weight polylactic acid can be obtained at a low cost. A process for the production of polylactic acid which comprises polymerizing molten lactide using at least one plug flow reactor that has a Xi(t) value of 0.3 or smaller as calculated from numerical formula (1) [wherein E(t) is a residence time distribution function found by an impulse response method with a starch syrup having a viscosity of 3Pas, and t is the ratio of elapsed time (Theta) to mean residence time (Theta0)].

Description

technical field [0001] The present invention relates to a method for producing polylactic acid. Background technique [0002] For polylactic acid, since lactic acid as a raw material is produced from potatoes, corn, sugar cane, etc., polylactic acid has carbon-neutral properties that do not affect the increase and decrease of carbon dioxide on the ground, and is used as a material that can be used in various applications. Polymers get attention. In addition, since the polymer has excellent melt formability, strength, etc., and has a biodegradability and decomposition promotion effect due to moisture, etc., it is also attracting attention from the point of view of easy recycling of used products. However, there are problems of low heat resistance and low rigidity, so they are only put to practical use within a limited range. As the continuous production method of existing polylactic acid, in patent document 1 (US-A-5136017, CA-A1-2056549, EP-A2-0499747), it is proposed to c...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/08
CPCC08G63/785B01J19/0066B01J19/1818B01J2219/00094B01J2219/00085B01J19/1862B01J2219/0004C08G63/08C08G63/78
Inventor 松叶健一郎青木强志
Owner UHDE INVENTA FISCHER
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