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Polylactic acid/polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol blend and preparation method thereof

A technology of polyethylene terephthalate and cyclohexanedimethanol, which is applied in the field of blending and modification of polymer materials, can solve the problems of brittle products, limit the application of PLA, and poor ductility, so as to improve ductility, Significant compatibilization effect and increased elongation at break

Active Publication Date: 2013-06-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, its brittleness and poor ductility greatly limit the application of PLA in the packaging industry and other fields.

Method used

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  • Polylactic acid/polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol blend and preparation method thereof
  • Polylactic acid/polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol blend and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) PLA and PETG are extruded and granulated by twin-screw blending at a mass ratio of 90:10. The blending temperature is 170-200°C and the screw speed is 100r / min to form blended granules of PLA and PETG;

[0026] (2) Dry the blended particles in step (1) and mold them into injection molded products by injection molding machine. The properties of the products are shown in Table 1.

Embodiment 2

[0028] (1) PLA and PETG are extruded and granulated by twin-screw blending at a mass ratio of 60:40. The blending temperature is 170-200°C and the screw speed is 100r / min to form blended granules of PLA and PETG;

[0029] (2) Dry the blended particles in step (1) and mold them into injection molded products by injection molding machine. The properties of the products are shown in Table 1.

Embodiment 3

[0031] (1) PLA and PETG are extruded and granulated by twin-screw blending at a mass ratio of 80:20. The blending temperature is 170-200°C and the screw speed is 100r / min to form blended granules of PLA and PETG;

[0032] (2) After quenching the above blended particles with liquid nitrogen, do a scanning electron microscope (SEM) test to observe the shape of the blend. For details, see figure 1 ;

[0033] (3) Dry the blended particles in step (1) and mold them into injection molded products by injection molding machine. The properties of the products are shown in Table 1.

[0034] Table 1

[0035] Numbering Elongation at break (%) Tensile strength (MPa) Tensile modulus (MPa) PLA 6.9 86.3 1411 Example 1 8.0 82.0 1293 Example 2 8.8 82.8 1301 Example 3 7.4 81.2 1167

[0036] As can be seen from Table 1 above, simply using PLA and PETG blending, the strength and modulus of the blend do not decrease significantly, while the elon...

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Abstract

The invention discloses polylactic acid / polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol blend. The polylactic acid / polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol blend is composed of 55 wt%-90 wt% of polylactic acid, 5 wt%-40 wt% of polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol, and polylactic acid graft maleic anhydride less than 5 wt%. The invention further provides a preparation method of the polylactic acid / polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol blend. Polylactic acid (PLA)-g-maleic anhydride (MAH) compatibilizer adopted by the polylactic acid / polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol blend is self-made compatibilizer, and in the processing procedure, operation is easy, and cost is low while compatibilizing effect is remarkable. Compared with pure PLA material, compatibility between the PLA and polyethylene terephthalate glycol (PETG) is remarkably improved, elongation at break of products is remarkably increased, but tensile strength and modulus changes are small.

Description

technical field [0001] The invention belongs to the field of blending modification of polymer materials, in particular to a preparation method of a polylactic acid / polyethylene terephthalate-1,4-cyclohexanedimethanol blend. Background technique [0002] Among the many biodegradable polymer materials, polylactic acid (PLA) is known as one of the varieties with the most development potential, mainly because PLA is completely biodegradable and plant-derived with renewable resources as raw materials, and it is a A material that maintains the "carbon cycle balance" in nature. Therefore, the development and application of PLA can reduce the white pollution of waste polymer materials to the environment, save petroleum resources, and inhibit the intensification of the global warming effect caused by the increase in net carbon dioxide emissions. [0003] Polylactic acid (PLA) enjoys a huge market demand due to its excellent properties such as biodegradability, renewability, high str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08L51/08C08F283/02B29B9/06
Inventor 杨伟蒋文柔包睿莹刘正英谢邦互杨鸣波
Owner SICHUAN UNIV
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