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Modification method for strengthening and toughening polylactic acid material

A technology of strengthening and toughening, polylactic acid, applied in the field of modification of polylactic acid material for strengthening and toughening, can solve the problems of low elongation at break and impact strength, poor toughness, restricting the progress of polylactic acid application, etc. Effects of Mechanical Strength and Toughness

Pending Publication Date: 2019-09-06
WENZHOU SHANGJU ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polylactic acid is a hard material with a high elastic modulus, but its toughness is poor, its elongation at break and impact strength are low, and it is difficult to be used in occasions that require high toughness of polymer materials. This shortcoming seriously restricts the application of polylactic acid progress

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this example, weigh 3 grams of sulfonated poly(styrene-isoprene-styrene) ionomer powder (the degree of sulfonation is 5.6%) and 30 grams of polylactic acid powder to physically blend uniformly, and then Add to internal mixer at 200 o C. Melt blending for 15 minutes, and then injection molding to obtain samples of polylactic acid composite materials for testing of mechanical properties. The test results show that the tensile strength of pure polylactic acid is 42MPa, and the tensile strength of the prepared polylactic acid composite material is 45MPa, which is increased by 7%, while the elongation at break is increased from 6% to 11%, which is increased by 0.83 times .

Embodiment 2

[0021] In this embodiment, weigh 4 grams of sulfonated poly(styrene-isoprene-styrene) ionomer powder (the degree of sulfonation is 14.7%) and 30 grams of polylactic acid powder to physically blend uniformly, and then Add to internal mixer at 200 o C. Melt blending for 15 minutes, and then injection molding to obtain samples of polylactic acid composite materials for testing of mechanical properties. The test results show that the tensile strength of the prepared polylactic acid composite material is 48MPa, which is increased by 14%, and the elongation at break is increased to 10%.

Embodiment 3

[0023] In this embodiment, weigh 9 grams of sulfonated poly(styrene-ethylene-butylene-styrene) ionomer powder (the degree of sulfonation is 4.8%) and 60 grams of polylactic acid powder to physically blend uniformly, and then added to the micro extruder at 200 o C was blended for 10 minutes by means of cyclic melt blending, and then injection molded to obtain samples of polylactic acid composite materials for testing of mechanical properties. The test results show that the tensile strength of the prepared polylactic acid composite material is 49MPa, which is increased by 17%, and the elongation at break is increased from 6% to 17%, which is increased by 1.83 times.

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Abstract

The invention discloses a modification method for strengthening and toughening polylactic acid. Sulfonated polystyrene ionomers containing sulfonated rigid segments and thermoplastic elastic flexiblesegments are blended by melting with the polylactic acid to modify the polylactic acid material and achieve the effects of strengthening and toughening. The sulfonated polystyrene ionomers are obtained by sulfonating polystyrene segments of polystyrene block copolymers such as poly (styrene-butadiene-styrene) (SEBS) and the like to different degrees, and the flexible segments play a role in toughening the polylactic acid composite material.

Description

technical field [0001] The invention belongs to the field of modification of composite materials, and relates to a modification method for strengthening and toughening polylactic acid materials. Background technique [0002] Polylactic acid, also known as polylactide, belongs to polyester polymer materials. Polylactic acid is a polymer obtained by polymerization of lactic acid as the main raw material. The source of raw material is abundant and renewable, so it is an ideal green polymer material. Polylactic acid has excellent biodegradability and biocompatibility, and can be completely degraded by microorganisms in nature after use, eventually producing carbon dioxide and water without polluting the environment. Polylactic acid also has the advantages of high strength, modulus and good processability. It is an environmentally friendly polymer material with great market application prospects. It has been widely used in biomedical materials, disposable degradable materials, p...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L53/02
CPCC08L67/04
Inventor 宋平安潘学剑徐之光张全月王积庚
Owner WENZHOU SHANGJU ENVIRONMENTAL PROTECTION TECH CO LTD
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