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Biodegradable supertough polylactic acid (PLA) blend material and preparation method thereof

A polylactic acid and blend technology, which is applied in the field of polymer mixture materials, can solve the problems of poor ductility and poor toughness, and achieves improved elongation at break, improved elongation at break and impact strength, and excellent impact resistance. Effect

Inactive Publication Date: 2016-08-17
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of poor toughness and poor ductility of polylactic acid in the prior art

Method used

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  • Biodegradable supertough polylactic acid (PLA) blend material and preparation method thereof
  • Biodegradable supertough polylactic acid (PLA) blend material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 90.0wt% polylactic acid resin, 7.5wt% polybutylene succinate, 2.0wt% polybutyl methacrylate-glycidyl methacrylate copolymer, 0.5wt% antioxidant triphosphite (2,4-di-tert-butylphenyl) ester (168) was mixed in a high-speed mixer, added to a Hakke internal mixer, melted and blended at 170-200 ° C, the speed was 100 rpm, and the mixing time was 5 minutes, and then The melt is extruded through a twin-screw extruder at a speed of 50 rpm, and the temperature of each section is 180-200° C., and cooled to granulate. A standard sample of the biodegradable super-tough polylactic acid ternary blend was prepared by compression molding or injection molding, and its mechanical and mechanical properties were measured. The tensile strength is 62.2MPa, the elongation at break is 15%, the notched impact strength is 8.3MPa, the unnotched impact strength is 25.0MPa, and the bending strength is 92.0MPa.

Embodiment 2

[0019] 90.0wt% polylactic acid resin, 5.0wt% polyadipate / butylene terephthalate (PBAT), 4.5wt% ethylene-acrylate-glycidyl methacrylate terpolymer and 0.5wt% %Antioxidant 168 was mixed in a high-speed mixer, added to a Hakke internal mixer, melted and blended at 170-200 ° C, the speed was 100 rpm, and the mixing time was 10 minutes, and then the melt was melted and extruded through a twin-screw extruder , the rotation speed is 50rpm, the temperature of each section is 180-200°C, and it is cooled and granulated. A standard sample of the biodegradable super-tough polylactic acid ternary blend was prepared by compression molding or injection molding, and its mechanical and mechanical properties were measured. The tensile strength of the modified PLA material is 61.5MPa, the elongation at break is 12%, the notched impact strength is 12.5MPa, the unnotched impact strength is 34.2MPa, and the bending strength is 83.2MPa.

Embodiment 3

[0021] Put 85.0wt% polylactic acid resin, 10.0wt% polybutylene succinate, 4.5wt% polybutyl methacrylate-glycidyl methacrylate copolymer, 0.5wt% antioxidant 168 into Mix in a high-speed mixer, add it to a Hakke internal mixer, melt and blend at 170-200°C, the speed is 100rpm, and the mixing time is 8min, and then the melt is melted and extruded through a twin-screw extruder with a speed of 50rpm 180-200 ° C, and cooling granulation. A standard sample of the biodegradable super-tough polylactic acid ternary blend was prepared by compression molding or injection molding, and its mechanical and mechanical properties were measured. The tensile strength of the modified PLA material is 56.4MPa, the elongation at break is 32%, the notched impact strength is 22.2MPa, the unnotched impact strength is 45.6MPa, and the bending strength is 68.0MPa.

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Abstract

The invention relates to a biodegradable supertough polylactic acid (PLA) blend material which is mainly composed of 60.0-90.0 wt% of PLA resin, 5.0-20.0 wt% of biodegradable plastic toughener, 2.0-20.0 wt% of reactive compatibilizer and 0.2-1.0 wt% of antioxidant. Fusion reaction blending is carried out to prepare the supertough PLA three-element blend material, thereby greatly enhancing the impact property and ductility of the PLA. The biodegradable supertough PLA blend material has the advantages of excellent impact strength and excellent elongation at break, does not greatly influence the bending strength and tensile strength of the PLA, and can be used in the fields of packaging, automobile industry and the like.

Description

technical field [0001] The invention relates to a polymer mixture material, in particular to a biodegradable super-tough polylactic acid ternary blend material. Background technique [0002] With the intensification of the energy crisis in human society and the increasing awareness of environmental protection, the industrial application of biodegradable materials and bio-based polymers in the field of polymers has received great attention. Polylactic acid (PLA) is a biodegradable polyester polymer material with excellent biocompatibility. At present, polylactic acid has been widely used in biomedicine, such as surgical lines, drug delivery systems, etc. The raw material of polylactic acid is derived from cassava, sugarcane, sweet sorghum and other food crops. Polylactic acid is directly degraded by biological enzymes to generate carbon dioxide and water. It is a completely biodegradable bio-based material that meets the needs of sustainable development of the environment at...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08L33/10C08L23/08C08L25/14C08L71/08C08L77/00C08K5/526
CPCC08L67/04C08L2205/02C08L2205/025C08L2205/03C08L2201/06C08L67/02C08L33/10C08L23/0884C08L25/14C08L71/00C08L77/00C08K5/526
Inventor 吴宁晶张红
Owner QINGDAO UNIV OF SCI & TECH
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