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Polylactic acid foam

A polylactic acid foaming and polylactic acid technology, applied in the direction of adhesives, etc., can solve the problems of insufficient physical properties, low strength, insufficient mechanical properties of resin foams, etc., and achieve excellent mechanical properties, high utilization value, and good appearance. Effect

Inactive Publication Date: 2008-03-26
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if biodegradable resins such as polylactic acid are used continuously at high temperatures for a long period of time, their strength will decrease due to hydrolysis and their physical properties will be insufficient.
In addition, even if a polyolefin resin is added to polylactic acid, since biodegradable resins and polyolefin resins are completely incompatible, it is difficult to produce a resin foam with a good appearance. Insufficient mechanical properties
In addition, when making a cross-linked foam, the two resins cannot be uniformly cross-linked, so that a cross-linked foam with a good appearance cannot be produced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] 30 parts by weight of the above-mentioned [a1] as polylactic acid (A), 60 parts by weight of the above-mentioned [b1] as polyolefin resin (B), and 10 parts by weight of the above-mentioned polyolefin resin copolymer (C) [c1], mixed with a V-type mixer to make a homogeneous mixture. Dry the above mixture in a vacuum dryer with a temperature set at 60°C for 4 hours, then use a twin-screw extruder with a screw diameter of 40 mm in the same direction, and set the temperature of the first half of the barrel at 180 to 150 rpm at a screw speed of 150 rpm. 200°C, setting the temperature of the second half at 160-180°C, extruding, forming strands, and then pelletizing to obtain a resin composition. The resulting resin composition was extruded from a circular die with a gap of 0.4 mm using a single-screw extruder with a screw diameter of 70 mm. out, foaming, made into a tubular foam, and cut it to make sheet-like polylactic acid foam. The obtained polylactic acid foam had no ir...

Embodiment 2～4

[0130] (Examples 2-4, Comparative Examples 1-4)

[0131] In Examples 2-4 and Comparative Examples 1-4, except having used the raw material composition shown in Table 1, the polylactic acid foam was produced by the method similar to Example 1. Table 2 shows the evaluation results of physical properties of the obtained polylactic acid foam.

[0132] [Table 1]

[0133] Polylactic acid (A)

[0134] Table 2

[0135] thickness

[0136] The polylactic acid foams of Examples 1 to 4 had good appearance and excellent compression recovery properties. However, in Comparative Examples 1 and 2, which did not use the polyolefin resin copolymer (C), since the compatibility between polylactic acid and polyolefin resin was not good, the surface morphology of the foam was not good, and the density and compression recovery could not be measured. sex. In addition, in Comparative Example 3 having a large resin weight ratio, although a foam with a good appearance was obt...

Embodiment 5

[0138] With respect to 100 parts by weight of the granular resin composition made in Example 1, add 5 parts by weight of triallyl cyanurate as a polyfunctional monomer (D), and azodicarbonamide as a blowing agent 9 parts by weight, 0.3 parts by weight of "Irganox" (registered trademark) 1010 (manufactured by Chiba Specialty Chemical Co., Ltd.) as a heat stabilizer, and "Adacastab" (registered trademark) AO-30 as a heat stabilizer (manufactured by Asahi Denka Co., Ltd.) 0.2 parts by weight, using a twin-screw extruder, the temperature of the first half of the barrel is set at 170-180°C, the temperature of the second half is set at 150-160°C, and the screw diameter is 60mmφ , extruded from a T-die at a screw speed of 15 rpm to produce a long foamable sheet with a thickness of 1.2 mm. Next, the foamable sheet was irradiated with ionizing radiation of 8 kGy at an accelerating voltage of 800 kV to cross-link the resin. The obtained cross-linked sheets are continuously fed into a v...

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Abstract

A polylactic acid foam obtained from a resin composition comprising polylactic acid (A), a polyolefin resin (B), and a polyolefin resin copolymer (C), characterized in that the ratio of the weight of the polylactic acid (A) to the total weight of the polyolefin resin (B) and the polyolefin resin copolymer (C), (A) / {(B)+(C, in the resin composition is 0.2-6. The polylactic acid foam is a foam made from a polylactic acid resin, which burdens the environment little, and excellent in heat resistance, moldability, and compression recovery. This polylactic acid foam is suitable for use in various applications where polyolefin resin foams are used at present, such as automotive applications, bases for heat insulators, cushioning materials, packing materials, pressure-sensitive adhesive tapes, etc., and joint filling materials.

Description

technical field [0001] The present invention relates to a polylactic acid foam. More specifically, the polylactic acid foam related to the present invention is a polylactic acid foam formed from a resin composition containing polylactic acid, a polyolefin resin, and a polyolefin resin copolymer, wherein the resin combination The ratio of the polylactic acid in the product to the sum of the polyolefin resin and the polyolefin resin copolymer is within a specific range. This polylactic acid foam is a foam that uses a polylactic acid resin that has a low load on the global environment and is excellent in heat resistance, moldability, and compression recovery, and can be used in various applications where polyolefin resin foams are currently used used in . Background technique [0002] Olefin-based resins represented by polyethylene and polypropylene, polyester resins such as polyethylene terephthalate and polybutylene terephthalate have been used as fibers, films, and other m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/04C08L23/00C08L67/04C08L101/16
CPCC08L67/04C08J9/0061C08L2205/02C08L23/02C08L23/0869C09J123/02C08J2323/02C08J2467/00C08L2666/06C08L2666/04C08J9/22C08L23/00
Inventor 冈善之吉冈孝英大山昌彦
Owner TORAY IND INC
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