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Preparation method of natural plant fiber/stereo polylactic acid composite material

A technology of natural plant fiber and composite material, which is applied in the field of preparation of natural plant fiber/stereopolylactic acid composite material, can solve problems such as the inability to effectively improve the heat resistance of PLA, and achieve excellent comprehensive performance, good heat resistance, and wide The effect of the application foreground

Inactive Publication Date: 2014-07-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the main component of natural plant fibers is cellulose with high crystallinity and polymerization degree, PLA can be reinforced with these natural plant fibers to obtain environmentally friendly PLA composite materials with good mechanical properties, but the above inventions are not effective. Improve the disadvantage of PLA's poor heat resistance

Method used

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  • Preparation method of natural plant fiber/stereo polylactic acid composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] PLLA, PDLA (the optical purity of both PLLA and PDLA are greater than 95%) and cotton fiber were vacuum-dried at 80° C. for 12 hours to remove moisture. Weigh 49.5% PLLA, 49.5% PDLA and 1% cotton fiber respectively by weight percentage, put them into a twin-screw extruder, melt at 210°C for 30min, and extrude to pelletize. Cotton fiber / stereotactic polylactic acid composite samples were prepared by injection molding machine, and the tensile properties, notched Izod impact strength and Vicat softening temperature of the tested samples are shown in Table 1.

Embodiment 2

[0028] PLLA, PDLA (the optical purity of both PLLA and PDLA are greater than 95%) and flax fiber were dried under vacuum at 60° C. for 6 h to remove moisture. Weigh 40% PLLA, 40% PDLA and 20% flax fiber respectively by weight percentage, put them into a torque rheometer, melt at 220°C for 5min, and then granulate. The flax fiber / stereotactic polylactic acid composite sample was prepared by injection molding machine, and the tensile properties, Izod notched impact strength and Vicat softening temperature of the test sample are shown in Table 1.

Embodiment 3

[0030] PLLA, PDLA (the optical purity of both PLLA and PDLA are greater than 95%) and ramie fiber were vacuum-dried at 70° C. for 12 hours to remove moisture. 25% PLLA, 25% PDLA and 50% ramie fibers were weighed in percentage by weight, added to a torque rheometer, melted at 230° C. for 10 minutes, and then granulated. Ramie fiber / stereotactic polylactic acid composite samples were prepared by injection molding machine, and the tensile properties, notched Izod impact strength and Vicat softening temperature of the tested samples are shown in Table 1.

[0031] Table 1 Properties of composite materials with different contents and different blending methods

[0032] test performance

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Abstract

The invention relates to a preparation method of a natural plant fiber / stereo polylactic acid composite material. The preparation method comprises the following steps: drying poly-L-lactic acid (PLLA), poly-dextrolactic acid (PDLA) and natural plant fibers in vacuum; melting and mixing 25-49.5wt% of poly-L-lactic acid, 25-49.5wt% of poly-dextrolactic acid and 1-50wt% of natural plant fibers, pelleting and forming, thus obtaining the natural plant fiber / stereo polylactic acid composite material. The preparation method is simple in a preparation technology; hazardous pollutants are not generated in a processing process; and the prepared composite material has good heat resistance, excellent mechanical performance and excellent overall property.

Description

technical field [0001] The invention belongs to the field of preparation of polymer composite materials, in particular to a preparation method of natural plant fiber / stereotactic polylactic acid composite materials. Background technique [0002] Polylactic acid (PLA), also known as polylactide, is a linear aliphatic thermoplastic polyester. It is a biopolymer prepared from corn and other starchy plants through fermentation and polymerization. It can be completely degraded into carbon dioxide in the environment. and water without polluting the environment. In addition, PLA also has the characteristics of rich raw material resources, non-toxicity, good biocompatibility, processability and mechanical properties, and can be widely used in packaging, agriculture, medical materials and clothing and other fields, so PLA is considered to be the most promising Promising biodegradable polymer materials. However, PLA materials still have disadvantages such as high brittleness, low he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L97/02C08L1/02
Inventor 张慧慧明瑞豪杨革生邵惠丽胡学超李玉增
Owner DONGHUA UNIV