Polylactic acid modified material and preparation method thereof

A modified material, polylactic acid technology, applied in the field of polylactic acid modified material and its preparation, can solve the problems of poor toughness and limited wide application, and achieve the effect of improved elongation at break and excellent tensile properties

Inactive Publication Date: 2013-05-08
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PLA is brittle, has poor toughness, and its elongation at break is about 5%, which greatly limits its wide application, and it must be toughened and modified.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: A polylactic acid modified material, the modified material includes: polylactic acid: 40% by mass; polyether polyamide elastomer: 30%; montmorillonite: 30%; prepare a polylactic acid When modifying materials, first dry the polylactic acid and polyether polyamide elastomer in a vacuum oven at 70°C for 24 hours, and dry the montmorillonite in a vacuum oven at 100°C for 24 hours, then dry the polylactic acid, polyether type The polyamide elastomer and montmorillonite were melt-blended in a twin-screw blender, the blending temperature was 170°C, the screw speed of the twin-screw blender was 50 rpm, and the blending time was 5 minutes to prepare a blending system , after drying the blended system, the modified material was prepared by injection molding with an injection molding machine. The barrel temperature of the injection molding machine was 175° C., the mold temperature was 50° C., and the injection molding cycle was 40 seconds.

Embodiment 2

[0019] Embodiment 2: A polylactic acid modified material, the modified material includes by mass percentage: polylactic acid: 70; polyether polyamide elastomer: 15; montmorillonite: 15; preparation of polylactic acid modified For materials, first dry polylactic acid and polyether polyamide elastomer in a vacuum oven at 70°C for 24 hours, and dry montmorillonite in a vacuum oven at 100°C for 24 hours, then dry polylactic acid, polyether polyamide The elastomer and montmorillonite were melt-blended in a twin-screw blender, the blending temperature was 175°C, the screw speed of the twin-screw blender was 70rpm, and the blending time was 8 minutes to prepare a blending system. After the blending system was dried, the modified material was prepared by injection molding with an injection molding machine. The barrel temperature of the injection molding machine was 180° C., the mold temperature was 50° C., and the injection molding cycle was 50 seconds.

Embodiment 3

[0020] Embodiment 3: A polylactic acid modified material, the modified material includes: polylactic acid: 82; polyether polyamide elastomer: 9; montmorillonite: 9; preparation of polylactic acid modified For materials, first dry polylactic acid and polyether polyamide elastomer in a vacuum oven at 70°C for 24 hours, and dry montmorillonite in a vacuum oven at 100°C for 24 hours, then dry polylactic acid, polyether polyamide The elastomer and montmorillonite were melt-blended in a twin-screw blender, the blending temperature was 180°C, the screw speed of the twin-screw blender was 80 rpm, and the blending time was 8 minutes to prepare a blending system. After the blending system was dried, the modified material was prepared by injection molding with an injection molding machine. The barrel temperature of the injection molding machine was 180° C., the mold temperature was 50° C., and the injection molding cycle was 50 seconds.

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Abstract

The invention discloses a polylactic acid modified material which comprises the following components in percentage by mass: 40-90% of polylactic acid, 5-30% of polyether type polyamide elastomer and 5-30% of montmorillonite. The preparation method of the polylactic acid modified material comprises the following steps: drying polylactic acid and polyether type polyamide elastomer in a vacuum drying oven at 70 DEG C for 24 hours, drying montmorillonite in a vacuum drying oven at 100 DEG C for 24 hours, and carrying out melt blending on the polylactic acid, polyether type polyamide elastomer and montmorillonite in a twin-screw blender to obtain a blend system, wherein the blending temperature is 170-190 DEG C, the screw speed of the twin-screw blender is 40-100 rpm, and the blending time is 5-10 minutes; and after drying the blend system, and carrying out injection molding with an injection molding machine to obtain the modified material, wherein the cylinder temperature of the injection molding machine is 170-190 DEG C, the mold temperature is 50 DEG C, and the injection molding cycle is 40-60 seconds. The invention has the advantages of high tensile strength and excellent elongation at break.

Description

technical field [0001] The invention relates to a polylactic acid modified material and a preparation method thereof. Background technique [0002] Among many polymers, polylactic acid (PLA) is known as the biodegradable polymer material with the most development potential because of its complete biodegradability and plant origin with renewable resources as raw materials. However, PLA is brittle, has poor toughness, and its elongation at break is about 5%, which greatly limits its wide application and must be toughened and modified. In addition, since PLA is often used in the biomedical field, when selecting toughened elastomers, biodegradable or bioinert materials should be selected to maintain the biodegradable or biomedical properties of the blend system. Polyurethane (PU) and PLA are melt blended. PU is dispersed in PLA at a micron scale to disperse energy. The prepared blend has excellent toughness. PLA / terephthalic acid is also prepared by melt extrusion. - Adipic ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K3/34B29B7/72B29C45/78
Inventor 张伟魏发云
Owner NANTONG UNIVERSITY
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