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Polylactic acid resin composition and molded body which is obtained using same

A technology of resin composition and polylactic acid resin, which is applied in the field of polylactic acid resin composition and molded products using it, can solve the problems of slow crystallization speed, etc., and achieve fast crystallization speed, improved crystallinity, and excellent crystallinity Effect

Inactive Publication Date: 2015-03-04
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when polylactic acid is used alone, its crystallization rate is extremely slow

Method used

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  • Polylactic acid resin composition and molded body which is obtained using same
  • Polylactic acid resin composition and molded body which is obtained using same
  • Polylactic acid resin composition and molded body which is obtained using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0173] The resin compositions and molded articles of Nos. 1 to 32 of Example 1 shown in Tables 1 and 3 and Nos. 1 to 15 of Comparative Example 1 shown in Tables 2 and 3 were prepared as follows.

[0174] The various materials shown in Tables 1 to 3 were dry-blended at the ratios shown in Tables 1 to 3, and the resulting mixture was supplied to a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd., TEM26SS). Melt-kneading was carried out under conditions of a rotation speed of 150 rpm and a discharge rate of 15 kg / h. The melt-kneaded product was extruded into strands through a die having three holes (0.4 mm in diameter), and cut to obtain pellets. The obtained pellets were dried at a temperature of 60° C. for 48 hours with a vacuum dryer (manufactured by Yamato Scientific, DP83) to obtain a pellet-shaped polylactic acid-based resin composition.

[0175] The obtained granular polylactic acid-based resin composition was injection-molded using an injection molding mach...

Embodiment 1

[0186] The polylactic acid-based resin composition of Example 1 had a short molding cycle to obtain a molded article, and the obtained molded article had a high heat distortion temperature and was excellent in heat resistance. In addition, the obtained molded article had a high retention rate of bending fracture strength and was excellent in wet heat durability.

[0187] The polylactic acid-based resin compositions of Nos. 17 to 22 in Example 1 were obtained by using tin oxide (B) and an organic crystal nucleating agent in combination. Therefore, the crystallinity is further improved, and the molding cycle becomes shorter. In addition, the heat resistance of the obtained molded article is also more excellent, and furthermore, the bending fracture strength retention rate is also high, and the wet heat durability is also improved.

[0188] The polylactic acid-type resin composition of No. 27-32 of Example 1 was obtained using tin oxide (B) and a carbodiimide compound together. ...

Embodiment 2 and comparative example 2

[0198] In this example, a resin composition containing a polylactic acid resin (A), tin oxide (B) and an impact modifier (C) is discussed.

[0199] The resin compositions and molded articles of Nos. 1 to 24 in Example 2 shown in Table 4 and Nos. 1 to 9 in Comparative Example 2 shown in Table 5 were produced in the following manner.

[0200] Various materials shown in Tables 4 to 5 were dry-blended at the ratios shown in Tables 4 to 5, and the same method as in Example 1 was used to obtain a granular polylactic acid resin composition.

[0201] The obtained granular polylactic acid resin composition is injection-molded by the same method as in Example 1, and made into a test piece (molded body) (80 mm in length, 10 mm in width, and 4 mm in thickness) for general physical property measurement based on ISO standards. ). This test piece was used for the measurement of the heat distortion temperature of the above (4), the measurement of the molding cycle of the above (5), and the m...

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Abstract

This polylactic acid resin composition contains a polylactic acid resin (A) that has a D form content of 0-2.0% by mole or 98.0-100% by mole. This polylactic acid resin composition additionally contains tin oxide (B) in an amount of 0.005-10 parts by mass per 100 parts by mass of the polylactic acid resin (A). A molded body which has excellent crystallinity, excellent heat resistance and sufficiently excellent wet heat durability can be obtained using this polylactic acid resin composition.

Description

technical field [0001] The present invention relates to a polylactic acid-based resin composition and a molded article using the same. Background technique [0002] Generally speaking, as resin raw materials for molding, polypropylene resin (PP), acrylonitrile-butadiene-styrene resin (ABS), polyamide resin (PA6, PA66, etc.), polyester resin (PET, PBT, etc.) etc.), polycarbonate resin (PC), etc. Molded articles made of such resins are excellent in moldability and mechanical strength. However, when discarded, the amount of garbage increases, and it hardly decomposes in the natural environment, so even if it is buried for disposal, it remains in the ground semi-permanently. [0003] Therefore, in recent years, biodegradable polyester resins have attracted attention from the viewpoint of environmental protection. Among them, polylactic acid, polyethylene succinate, polybutylene succinate, and the like can be mass-produced, so they are inexpensive and highly useful. Polylacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K3/22C08L101/16
CPCC08L67/04C08L23/00C08L33/12C08L51/04C08L55/02C08K3/22C08L69/00C08K2003/2231C08L2205/24C08L2207/53C08L2205/06
Inventor 石井成明竹谷丰井上和子冲田祐介臼井亚津沙上田一惠川田宪一
Owner UNITIKA LTD
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