Chain-extended modified PLA/PETG (polylactic acid/poly (ethylene terephthalateco-1, 4-cylclohexylenedimethylene terephthalate)) blend and preparation method thereof

A technology of ethylene glycol phthalate and cyclohexanedimethanol ester, which is applied in the field of polymer material blending and modification, can solve the problems of large viscosity difference, difficult PLA performance, poor compatibility, etc., and achieve an increase in toughness , low cost, good modification effect

Active Publication Date: 2014-03-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor compatibility and large viscosity difference between PETG and PLA, it is difficult to greatly improve the performance of PLA.

Method used

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  • Chain-extended modified PLA/PETG (polylactic acid/poly (ethylene terephthalateco-1, 4-cylclohexylenedimethylene terephthalate)) blend and preparation method thereof
  • Chain-extended modified PLA/PETG (polylactic acid/poly (ethylene terephthalateco-1, 4-cylclohexylenedimethylene terephthalate)) blend and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) First, the PLA and MDI, which were pre-dried in an oven at 60°C for 36 hours, were composed according to the mass ratio, and granulated by twin-screw melt extrusion at a processing temperature of 180°C and a speed of 60r / min;

[0032] (2) Dry the pellets in step (1) in an oven at 60°C for 36 hours to obtain PLA pellets after chain extension;

[0033] (3) The chain-extended PLA pellets in step (2) and PETG are composed according to the mass ratio, and the same processing conditions as described in step (1) are used to melt and blend through a twin-screw extruder to obtain chain-extended modification The polylactic acid / polyethylene terephthalate-1,4-cyclohexanedimethanol blend prepared by the method, the mass ratio of PLA:PETG:MDI is controlled to be 80:20:5;

[0034] (4) Dry the blend in step (3) and mold it into an injection molded product by an injection molding machine. The properties of the product are shown in Table 1.

Embodiment 2

[0036] (1) First, the PLA and MDI, which were pre-dried in an oven at 60°C for 36 hours, were composed according to the mass ratio, and granulated by twin-screw melt extrusion at a processing temperature of 180°C and a speed of 60r / min;

[0037] (2) Dry the pellets in step (1) in an oven at 60°C for 36 hours to obtain PLA pellets after chain extension;

[0038] (3) The chain-extended PLA pellets in step (2) and PETG are composed according to the mass ratio, and the same processing conditions as described in step (1) are used to melt and blend through a twin-screw extruder to obtain chain-extended modification The polylactic acid / polyethylene terephthalate-1,4-cyclohexanedimethanol blend prepared by the method, the control PLA:PETG:MDI mass ratio is 80:20:3;

[0039] (4) Dry the blend in step (3) and mold it into an injection molded product by an injection molding machine. The properties of the product are shown in Table 1.

[0040] (5) Do a scanning electron microscope (SEM) ...

Embodiment 3

[0046] (1) First, the PLA and MDI, which were pre-dried in an oven at 60°C for 36 hours, were composed according to the mass ratio, and granulated by twin-screw melt extrusion at a processing temperature of 180°C and a speed of 60r / min;

[0047] (2) Dry the pellets in step (1) in an oven at 60°C for 36 hours to obtain PLA pellets after chain extension;

[0048] (3) The chain-extended PLA pellets in step (2) and PETG are composed according to the mass ratio, and the same processing conditions as described in step (1) are used to melt and blend through a twin-screw extruder to obtain chain-extended modification The polylactic acid / polyethylene terephthalate-1,4-cyclohexanedimethanol blend prepared by the method, the PLA:PETG:MDI mass ratio is controlled to be 90:10:3;

[0049] (4) Dry the blend in step (3) and mold it into an injection molded product by an injection molding machine. The properties of the product are shown in Table 2.

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Abstract

The invention discloses a chain-extended modified PLA/PETG (polylactic acid/poly (ethylene terephthalateco-1, 4-cylclohexylenedimethylene terephthalate)) blend. The blend is characterized by comprising the components in percentage by weight as follows: 40%-90% of PLA, 10%-60% of PETG and 4, 4'-diphenyl-methane-diisocyanate, and the amount of 4, 4'-diphenyl-methane-diisocyanate does not exceed 5% of total weight of the PLA. The invention further provides a chain-extended modified preparation method of the PLA/PETG blend. According to the invention, the processing process is simple in operation and the cost is low; and compared with a pure PLA material, the rigidity of a product is maintained, the good modifying effect of reinforcement and toughening is simultaneously achieved, further, the toughening amplitude is greatly increased, and the use field range of the PLA product is remarkably broadened.

Description

technical field [0001] The invention belongs to the field of blending modification of polymer materials, in particular to a polylactic acid / polyethylene terephthalate-1,4-cyclohexanedimethanol blend modified by chain extension and its Preparation. Background technique [0002] Since plastics were put into use in the 1930s, they have been loved by people for their light weight, low price, corrosion resistance, good chemical stability, good processability, and good insulation. The pillar industries that keep pace with each other have been widely used in agriculture, food industry, construction industry, electronic appliances, aerospace and other fields. However, the vast majority of plastic raw materials come from petroleum, which is a non-renewable resource. As the world's petroleum gradually decreases, it will inevitably affect the development of the plastic industry that uses petroleum as raw material. In addition, traditional plastics are difficult to decompose in nature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08K5/29C08G18/42
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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