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Polylactic acid foamed particle and molded product of the polylactic acid foamed particle

A technology of polylactic acid resin and foam particles, which is applied in the field of polylactic acid resin foam particle moldings, and can solve the problems of foam particle fusion adhesion, insufficient dimensional stability, large density dispersion, and poor mechanical properties

Inactive Publication Date: 2007-03-21
JSP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, since the existing foamed particle molded body made of polylactic acid resin is to fill the foamable non-foamed resin particles in the metal mold, the resin particles are foamed by hot air, and at the same time the particles are separated from each other. It is made by melting and bonding each other, so the density of a part of the foam particle molded body has a large dispersion, and the fusion adhesion and dimensional stability of the foam particles are not sufficient, and the mechanical properties are poor.

Method used

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  • Polylactic acid foamed particle and molded product of the polylactic acid foamed particle
  • Polylactic acid foamed particle and molded product of the polylactic acid foamed particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6、 comparative example 1～4

[0092] The heat absorption (ΔH endo：Material ) is 37J / g of crystalline polylactic acid resin (manufactured by Shimadzu Corporation, ラクライ9030) and the heat absorption (ΔH endo：Material ) is 0J / g non-crystalline polylactic acid resin (manufactured by Shimadzu Corporation, ラクライ9800) according to the mixing ratio (weight ratio) shown in Table 1 and mixed, the blend and talc in the extruder After medium melting and kneading, extrude in the form of strands, and then quench and solidify the strands in water at about 25° C., then cut to obtain cylindrical resin particles with a diameter of about 1.3 mm, a length of about 1.9 mm, and each about 3 mg. In addition, the amount of talc added to the resin particles was 2000 ppm.

[0093] Then, the inside of an airtight container having an internal volume of 5 L was adjusted to the immersion temperature shown in Table 1, and 1000 g of the above-mentioned resin particles were put into the container. carbon dioxide (CO 2 ) is pressed into t...

Embodiment 7

[0100] The heat absorption (ΔH endo：Material ) is 49J / g of crystalline polylactic acid resin (produced by Mitsui Chemicals Co., Ltd., レイシアH-100) and the heat absorption (ΔH endo：Material ) is 0 J / g non-crystalline polylactic acid resin (Mitsui Chemicals Co., Ltd., Leysia H-280) was mixed at the mixing ratio (weight ratio %) shown in Table 3, and talc was added to the mixture to make it The blending amount was 2000 ppm, and these were melt-kneaded in an extruder, and then extruded in a linear form. Next, the wire was rapidly cooled and solidified in water at about 25° C., and then cut to obtain cylindrical resin particles with a resin particle length (L) to diameter (D) ratio (L / D) of 1.5 and about 3 mg per one.

[0101] In addition to making CO 2 Except for the immersion conditions shown in Table 3, expandable resin particles were prepared from the obtained resin particles in the same manner as in Example 1.

[0102] Next, after filling the expandable resin particles in an ...

Embodiment 8

[0105] In a closed container with a capacity of 5L, add 1000g of resin particles made by the same method as in Example 7 and 3L of water as a dispersion medium, then carbon dioxide (CO 2 ) is pressed into the airtight container, and the CO in the airtight container 2 The pressure was adjusted to the pressure shown in Table 3, and the dispersion medium was stirred while being maintained under the immersion conditions shown in Table 3. Next, after the pressure in the airtight container was brought to atmospheric pressure, the expandable resin particles into which carbon dioxide had been impregnated were taken out together with the dispersion medium.

[0106] Then, after filling the expandable resin particles in an airtight container provided with a pressure regulating valve, introduce 0.05MPa(G) (65°C) steam for 5 seconds and heat to foam the resin particles to obtain a non-crosslinked foam particles. The properties of the foam particles are shown in Table 3.

[0107] Then, t...

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Abstract

An expanded bead of a polylactic acid resin containing at least 50 mole % of lactic acid units. The expanded bead has such characteristics in heat flux scanning differential calorimetry that a difference ( DELTA Hendo:Bead- DELTA Hexo:Bead) between an endothermic calorific value DELTA Hendo:Bead and an exothermic calorific value DELTA Hexo:Bead is not less than 0 J / g but less than 30 J / g and that the endothermic calorific value DELTA Hendo:Bead is at least 15 J / g. A foamed molding obtainable by molding the expanded beads in a mold has a flexural strength of A ÄN / cm<2>Ü and a density of B Äg / cm<3>Ü, wherein the ratio of A / B is at least 294 N.cm / g.

Description

[0001] This application is a divisional application of the Chinese application with the application number CN03154626.9 (application date is July 1, 2003) and the invention name is "polylactic acid resin foam particles and polylactic acid resin foam particle molded body". technical field [0002] The present invention relates to polylactic acid resin foam particles with microbial decomposability and the foam particle molded body, more specifically, to a foam particle suitable for the preparation of foam particles with excellent melt adhesion and dimensional stability, small density dispersion, Polylactic acid resin foamed particles having uniform mechanical properties, and a polylactic acid resin foamed particle formed body obtained therefrom. Background technique [0003] Foam particle moldings made of resins such as polystyrene, polyethylene, and polypropylene are widely used as cushioning materials for packaging, boxes for agricultural products, boxes for fish, automotive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/16C08L67/04C08J9/18
CPCC08J2367/04C08J2203/06C08J9/18C08J9/232
Inventor 筱原充常盘知生佐佐木秀浩
Owner JSP CORP
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