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Natural fiber-reinforced polylactic acid resin composition and molded product made using the same

A technology of polylactic acid resin and natural fiber, which is applied in the field of natural fiber reinforced polylactic acid resin composition and its molded products, can solve the problem of insufficient bonding between natural fiber and polylactic acid, failure to provide performance, and biomass reduction and other issues

Inactive Publication Date: 2010-06-16
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the stereocomplex composition does not have sufficient performance, and the glass fiber reinforcement disclosed in Japanese Patent Laid-Open No. 2006-265486 has a problem of biomass reduction while being able to improve strength
[0010] Natural fiber reinforcement disclosed in Japanese Patent Laid-Open No. 2006-045428 does not provide sufficient performance due to insufficient bonding between natural fibers and polylactic acid
In the above method, since polylactic acid and natural fibers are simply kneaded, mechanical strength cannot be achieved due to defects of natural fibers and weak bonding at the interface between natural fibers and polylactic acid resin

Method used

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  • Natural fiber-reinforced polylactic acid resin composition and molded product made using the same
  • Natural fiber-reinforced polylactic acid resin composition and molded product made using the same
  • Natural fiber-reinforced polylactic acid resin composition and molded product made using the same

Examples

Experimental program
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Effect test

Embodiment

[0107] The natural fiber reinforced polylactic acid resin composition according to the embodiment includes the following components:

[0108] (1) Polylactic acid resin

[0109] 4032D produced by NatureWorks, Inc., USA was used as the L-polylactic acid resin. D,D-lactide manufactured by Purac Corporation was polymerized to provide a D-polylactic acid resin having a weight average molecular weight of 50000 g / mol.

[0110] (2) Natural fiber

[0111] It is produced from hemp and has a cellulose component content of 98% by weight, an average length of 5 mm, and an average diameter of 10 μm.

preparation example 1

[0114] The masterbatch is prepared by adding dried hemp to the reactor, followed by ring-opening polymerization of D,D-lactide monomer produced by Purac.

[0115] During ring-opening polymerization, hemp and D,D-lactide monomers were mixed in a batch mixing device at 180°C for 5 minutes and extruded with a twin-screw extruder attached to the mixing device to provide pellets. D,D-lactide monomer and hemp were used in a 1:1 weight ratio in the final dipped product.

[0116]At this time, the catalyst used for polymerization included stannous octoate and triphenylphosphine in the same molar ratio. In the impregnated product, D-polylactic acid resin obtained by adding D,D-lactide monomer in an amount of 500 mol based on 1 mol of the catalyst and natural fiber was present in a weight ratio of 1:1.

[0117] Vacuum drying was performed at 100°C to remove unreacted monomer from the mixture of polymer, monomer and natural fibers.

preparation example 2

[0119] The masterbatch was prepared by adding D-polylactic acid resin and natural fibers into a batch mixing device at a weight ratio of 1:1 and then melt mixing.

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Abstract

Disclosed is a natural fiber-reinforced polylactic acid resin composition that includes (A) a first polylactic acid resin; and (B) a natural fiber surface-treated with a second polylactic acid resin. The second polylactic acid resin can include a different isomer from the first polylactic acid resin, or alternatively, when measured under isothermal conditions after quenching from about 240 DEG C to a crystallization temperature, a spherulite crystal is first formed at a surface of the natural fiber and the growth rate at the surface is faster than at other positions. A molded product made using the natural fiber-reinforced polylactic acid resin composition is also disclosed.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit to Korean Patent Applications 10-2008-0114242 and 10-2009-0109968 filed with the Korean Intellectual Property Office on November 17, 2008 and November 13, 2009, the entire contents of which are incorporated by reference here. technical field [0003] The present invention relates to a natural fiber-reinforced polylactic acid resin composition and a molded article made using the composition. Background technique [0004] Much research has been done on the development of tough and safe polymeric materials for specific purposes. [0005] However, since waste polymers have been recognized as a serious environmental problem throughout the world, there is a need to develop environmentally friendly polymer materials. Environmentally friendly polymers can be mainly classified into photodegradable and biodegradable polymers. Biodegradable polymers have functional groups that can b...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K9/04C08K7/02
CPCC08L67/04C08L33/12C08K7/02C08K9/08C08J5/00C08K2201/004C08K2201/003C08L2201/02
Inventor 郑英美郑昌道河斗汉
Owner CHEIL IND INC
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