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Method for preparing heat-resisting polylactic acid nanocomposite through irradiation modification

A nano-composite material, polylactic acid technology, applied in the field of polylactic acid modification, can solve the problems of decreased processing performance, decreased fluidity of polylactic acid, etc., and achieve the effects of improved tensile strength, improved Vicat softening point, and simple process

Inactive Publication Date: 2012-07-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts the method of processing first and then irradiating, and also effectively solves the problems of reduced fluidity and processing performance of polylactic acid caused by irradiation crosslinking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Polylactic acid: 300g

[0025] Modified montmorillonite: 9g

[0026] PE wax: 3g

[0027] Antioxidant: 3g

[0028] Triallyl isocyanurate: 9g

[0029] Through twin-screw granulation, after molding, the obtained product is irradiated with electron beams in a nitrogen atmosphere, and the irradiation dose is 15kGy. The obtained product has a tensile strength of 70 MPa and a Vicat softening point of 156.9°C.

Embodiment 2

[0031] Polylactic acid: 300g

[0032] Modified montmorillonite: 9g

[0033] PE wax: 3g

[0034] Antioxidant: 3g

[0035] Triallyl isocyanurate: 3g

[0036] Through twin-screw granulation, after molding, the obtained product is irradiated with electron beams in a nitrogen atmosphere, and the irradiation dose is 15kGy. The obtained product has a tensile strength of 63 MPa and a Vicat softening point of 151.2°C.

Embodiment 3

[0038] Polylactic acid: 300g

[0039] Modified montmorillonite: 9g

[0040] PE wax: 3g

[0041] Antioxidant: 3g

[0042] Triallyl isocyanurate: 6g

[0043] Through twin-screw granulation, after molding, the obtained product is irradiated with electron beams in a nitrogen atmosphere, and the irradiation dose is 15kGy. The tensile strength of the obtained product was 66MPa, and the Vicat softening point was 153.4°C.

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Abstract

The invention belongs to a method for preparing a heat-resisting polylactic acid nanocomposite through irradiation modification. The heat-resisting polylactic acid nanocomposite comprises polylactic acid, modified montmorillonite, PE (Poly Ethylene) wax, antioxidant, and polyfunctional monomer. Extruding granulation is carried out through a double-screw, then forming is realized through mould pressing or other methods, and finally a formed workpiece is placed in nitrogen atmosphere and is irradiated by electron beams at room temperature. The obtained product has excellent heat resistance.

Description

technical field [0001] The invention belongs to the field of polylactic acid modification methods, in particular to a polylactic acid nanocomposite material prepared by electron beam irradiation modification. Background technique [0002] Polylactic acid is a biodegradable polymer obtained by fermenting lactic acid from renewable resources such as grain or plant straw, and then chemically synthesized. It has excellent biocompatibility, biodegradable absorption, high strength, good plasticity, easy processing and molding, and does not cause any pollution to the environment. It is considered to be the most promising biodegradable polymer material. However, the glass transition temperature of polylactic acid is around 60°C, and its heat resistance is poor. When the temperature is higher than its glass transition temperature, the dimensional stability of the material product is very poor, which greatly hinders the application of polylactic acid. There are three main methods to ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K13/06C08K9/04C08K3/34C08F283/02B29C35/08
Inventor 张丽叶刘亮
Owner BEIJING UNIV OF CHEM TECH
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