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Polylactic acid mixture and impact-resistant formed product thereof

A polylactic acid and blend technology, which is applied in the field of polylactic acid resin blends and their molded products, can solve the problems of inability to significantly improve the impact strength of polylactic acid, improve impact performance and heat resistance, maintain melt the effect of strength

Inactive Publication Date: 2012-08-15
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the impact strength of polylactic acid cannot be significantly improved only by crystallization, and even this increase in impact strength is based on sacrificing the toughness of molded products

Method used

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  • Polylactic acid mixture and impact-resistant formed product thereof
  • Polylactic acid mixture and impact-resistant formed product thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] Preparation of blend masterbatch:

[0032] Each component in the examples and comparative examples was co-extruded and granulated by a twin-screw extruder. The temperature of the feeding section of the twin-screw extruder (Kobe Steel Works TEX30) is 170° C., and the temperature of the other sections is 200° C. During the extrusion process, vacuum is exhausted.

[0033] dry:

[0034] The resin and the masterbatch were dried at 80° C. for 15 hours using a double-cone rotary vacuum dryer (Changzhou Huiyang Drying).

[0035] Film preparation:

[0036] Extrude through a single-screw extruder with a T-die and pass through a casting roll to produce a film with a thickness of about 0.5 mm. The temperature of the feeding section of the twin-screw extruder is 170°C, and the temperature of other sections is 210°C.

[0037] Injection molding:

[0038] A sample bar for impact was prepared using an injection molding machine (Nisei Seiki NEX1000) having an aspect ratio of 20. Th...

Embodiment (1

[0052] Polylactic acid 4032D (Natureworks, weight-average molecular weight Mw≈200,000), ethylene-vinyl acetate copolymer (Korean Hyundai Petrochemical Co., Ltd. VC590, vinyl acetate content is 28wt%), and ethylene bis-lauramide according to 100:20 : 1 weight mixed and then extruded by a twin-screw extruder to prepare a masterbatch. After the masterbatch is dried, a casting film is prepared by a single-screw casting molding machine. The treatment was performed at 120° C. for 45 seconds in a blast oven.

[0053] After testing, its impact strength is 193KJ / m 2 , heat resistance is "◎".

Embodiment (2

[0055] Polylactic acid 4032D (Natureworks, weight-average molecular weight Mw≈200,000), ethylene-vinyl acetate copolymer (Korean Hyundai Petrochemical Co., Ltd. VC590, vinyl acetate content is 28wt%), and ethylene bis-lauramide according to 100:20 : 3 weight mixed and then extruded by a twin-screw extruder to prepare a masterbatch. After drying the masterbatch, a sample strip was obtained by injection molding. The strips were treated in a tunnel oven at 130°C for 50 seconds.

[0056] After testing, its impact strength is 221KJ / m 2 , heat resistance is "◎".

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Abstract

The invention provides a polylactic acid mixture with `high impact resistance and high heat resistance. The mixture is prepared by 100 parts of polylactic acid, 0.5-100 parts of ethylene-vinyl acetate copolymer and 0.1-10 parts of amide compound. A formed product which is obtained by the polylactic acid mixture is obtained by heat-treating the formed product which is made of the mixture during forming or after forming. The mixture and the formed product have high impact resistance and high heat resistance, thus having wide application in the fields of packaging materials and the like.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and mainly relates to a polylactic acid resin blend and its shaped product. Background technique [0002] In recent years, the consumption of polyethylene, polypropylene, polyester, nylon, etc., which are used as food and beverage containers, trays, etc., and commodity outer packaging materials has increased year by year. Along with this, the amount of post-use waste is also increasing. Incineration and landfilling of these wastes have caused various environmental problems. In order to solve these problems, biodegradable polymers have been increasingly used in recent years. Among them, polylactic acid is widely used in industry due to its relatively high melting point and relatively high mechanical properties. [0003] But when PLA itself is brittle, the glass transition temperature is lower. Therefore, compared with general-purpose resins, molded products directly prepared from polyla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K5/20B29C71/02C08L23/08
Inventor 夏天赖铮铮邱若愚河野俊司
Owner TORAY FIBER RES INST(CHINA) CO LTD