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Preparation method of high-toughness polylactic acid based composite material

A technology of composite materials and tough polylactic acid, which is applied in the field of high-toughness polymer materials preparation, can solve the problems of great influence on compatibility, reduction of strength and hardness of composite materials, and limited improvement of toughness, etc., to achieve flexibility and movement Good ability, good tensile strength, effect of increasing interaction force

Inactive Publication Date: 2017-05-31
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For plasticizers, elastomers and tough polymers, introducing them into polylactic acid will increase the toughness, but the strength and hardness of the composite will be greatly reduced, while for montmorillonite, carbon black, carbon nanotubes For inorganic fillers such as inorganic fillers, although their addition can improve the mechanical properties, thermal properties, and electrical properties of composite materials, the dispersion state of the fillers and the compatibility with the matrix have a greater impact, and at the same time have a greater impact on the degree of toughness. limited

Method used

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  • Preparation method of high-toughness polylactic acid based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The polylactic acid and carbon nanotubes are used in a mass ratio of 100:10 to obtain a polylactic acid / carbon nanotube composite material through a twin-screw extruder, which is used as a masterbatch after drying; the extrusion temperature during extrusion is 185 ° C, and the rotation speed is 150rpm;

[0020] The masterbatch is mixed with polylactic acid, ethylene-vinyl acetate copolymer, and dicumyl peroxide at a mass ratio of 20:60:20:0.4, and passed through a twin-screw extruder at a temperature of 190°C and a rotational speed of 120rpm. Squeeze out and get it.

[0021] The carbon nanotubes used in this example are multi-walled carbon nanotubes with a diameter of 10 nm and a length of 10 μm; the content of vinyl acetate blocks in the ethylene-vinyl acetate copolymer is 50 wt%.

[0022] Tests show that the notched impact strength of the material prepared in this example can reach 54.7MPa, and the tensile strength is 41.1MPa, which belongs to the high-toughness PLA-...

Embodiment 2

[0025] Polylactic acid and carbon nanotubes are used in a mass ratio of 100:10 to obtain a polylactic acid / carbon nanotube composite material through a twin-screw extruder, which is used as a masterbatch after drying; the extrusion temperature is 160 ° C, and the rotation speed is 100 rpm;

[0026] The masterbatch is mixed with polylactic acid, ethylene-vinyl acetate copolymer, and dicumyl peroxide at a mass ratio of 1:94:5:0.1, and the twin-screw extruder is extruded at a temperature of 160°C and a rotation speed of 100rpm. Extruded under the conditions, that is.

[0027] The carbon nanotubes in this example are single-walled carbon nanotubes with a diameter of 200 nm and a length of 50 μm, and the vinyl acetate block content in the ethylene-vinyl acetate copolymer is 40 wt%.

Embodiment 3

[0029] The polylactic acid and carbon nanotubes are used in a mass ratio of 100:20 to obtain a polylactic acid / carbon nanotube composite material through a twin-screw extruder, which is used as a masterbatch after drying; the extrusion temperature during extrusion is 220 ° C, and the rotation speed is 250rpm;

[0030] The masterbatch is mixed with polylactic acid, ethylene-vinyl acetate copolymer, and dicumyl peroxide in a mass ratio of 25:40:35:1, and passed through a twin-screw extruder at an extrusion temperature of 220°C and a rotation speed of 250rpm. Extruded under the conditions, that is.

[0031] The carbon nanotubes in this example are single-walled carbon nanotubes with a diameter of 100 nm and a length of 30 μm, and the vinyl acetate block content in the ethylene-vinyl acetate copolymer is 80%wt.

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Abstract

The invention discloses a preparation method of a high-toughness polylactic acid based composite material. The preparation method comprises steps as follows: a polylactic acid / carbon nanotube composite material is prepared from polylactic acid and carbon nanotubes in a mass ratio being 100:(5-20) by a twin-screw extruder and is taken as a master batch after being dried; the extrusion temperature is 160-220 DEG C, and the revolving speed is 100-250 rpm; the master batch, polylactic acid, an ethylene-vinyl acetate copolymer and dicumyl peroxide in a mass ratio being (1-50):(15-94):(5-35):(0.1-1) are extruded by the twin-screw extruder at the temperature of 160-220 DEG C and at the revolving speed of 100-250 rpm, and the high-toughness polylactic acid based composite material is obtained. The polylactic acid based composite material prepared with the method is high in notch impact strength and better in tensile strength and belongs to the high-toughness polylactic acid based composite material.

Description

technical field [0001] The invention belongs to the technical field of high toughness polymer material preparation. Background technique [0002] Polylactic acid is an aliphatic polymer with abundant sources of raw materials and no pollution in the production process. It is a high-strength, high-modulus, degradable and environmentally friendly material. Polylactic acid has good biocompatibility and biodegradability, and has a wide range of applications in the field of biomedicine, such as surgical sutures, drug sustained release carriers, etc. Polylactic acid also has good air permeability and transparency, so it also has large-scale commercial application prospects in agriculture, packaging and other fields. However, polylactic acid has a high degree of brittleness, and its notched impact strength is relatively low, which limits its application in industrial production. Therefore, the toughening modification of polylactic acid is a hot spot that is widely concerned. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L23/08C08K7/24C08K3/04C08K5/14C08J3/22B29C47/92B29C48/92
CPCC08L67/04B29C48/92B29C2948/92514B29C2948/92704C08J3/226C08J2367/04C08J2467/04C08K2201/011C08L2205/025C08L2205/03C08L23/0853C08K7/24C08K3/04C08K5/14
Inventor 王勇张楠王雄飞杨静晖黄婷
Owner SOUTHWEST JIAOTONG UNIV