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Graphene reinforced and toughened biodegradable polyester compound and foaming material thereof

A technology for strengthening, toughening, and degrading polyester, which is used in biological packaging, sustainable packaging, climate sustainability, etc. It can solve the problem of low foaming material ratio, poor compatibility, physical foaming behavior, and limited improvement in material toughness. and other problems to achieve the effect of improving physical foaming behavior, increasing tensile strength and elongation at break, and improving compatibility

Active Publication Date: 2020-06-23
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PBAT and PLA are incompatible systems, and the compatibility of the alloy can be improved by adding an epoxy chain extender, but the improvement of the toughness of the material is limited, and it is difficult to simultaneously improve the strength and toughness of the alloy
[0004] The poor compatibility of PBAT / PLA alloy also affects its physical foaming behavior, which makes it easy for high-pressure fluid to escape from the interface during the foaming process, resulting in the problem of low expansion ratio of foamed materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Disperse 1 g of graphene oxide (with a carbon-to-oxygen ratio of 3, containing epoxy groups, carboxylic acid groups, and aldehyde groups) in 500 ml of water through a high-energy ultrasonic probe, and freeze-dry the GO aqueous solution to obtain fluffy GO powder. 1 g of GO powder was dispersed in 50 g of DMF. Dissolve 5 g of the trifunctional epoxy chain extender in 30 ml of DMF by stirring, add the resulting dispersion into the GO / DMF dispersion, and continue stirring for 2 h. A triphenylphosphine catalyst is added to the dispersion to induce a chemical reaction. The epoxy-grafted GO (GO-epoxy) powder was obtained by multiple filtration, washing with acetone, and drying. PBAT (50% by weight), PLA (49% by weight) and GO-epoxy (1% by weight) dried at 70°C / 5h were circulated at 200°C for 10 minutes, and molded to obtain a thickness of 1.0 mm biodegradable composite sheet. The biodegradable composite was saturated under the condition of 15MPa / 130°C for 30min, and the bi...

Embodiment 2

[0028] The preparation method of epoxy-grafted GO (GO-epoxy) powder is the same as that of Example 1. PBAT (89.9% by weight), PLA (10% by weight), and GO-epoxy (0.1% by weight) dried at 70°C / 5h were mixed at 200°C for 10 minutes, and molded to obtain a thickness of 1.0 mm biodegradable composite sheet. The biodegradable composite was saturated under the condition of 20MPa / 135°C for 30min, and the biodegradable composite foam material was obtained through rapid pressure release.

[0029] Studies have shown that the tensile strength of the biodegradable composite is 33 MPa, and the elongation at break is 150%; the density of the biodegradable composite foam material is 0.08 g / cm 3 , the hardness is Shao C42, the cell size is 120.3mm, and the cell density is 1.1´10 8 piece / cm 3 ; The tensile strength of the composite foam material is 4.3MPa, and the elongation at break is 210%.

Embodiment 3

[0034] The preparation method of epoxy-grafted GO (GO-epoxy) powder is the same as that of Example 1. PBAT (50% by weight), PLA (45% by weight), and GO-epoxy (5% by weight) dried at 70°C / 5h were circulated at 200°C for 10 minutes, and molded to obtain a thickness of 1.0 mm biodegradable composite sheet. The biodegradable composite was saturated under the condition of 20MPa / 135°C for 30min, and the biodegradable composite foam material was obtained through rapid pressure release.

[0035] Studies have shown that the tensile strength of the biodegradable composite is 42 MPa, and the elongation at break is 350%; the density of the biodegradable composite foam material is 0.05 g / cm 3 , the hardness is Shao C55, the cell size is 102.3mm, and the cell density is 3.5´10 8 piece / cm 3 ; The tensile strength of the composite foam material is 6.5MPa, and the elongation at break is 380%.

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Abstract

The invention discloses a graphene reinforced and toughened biodegradable polyester compound and a foaming material thereof. The preparation method comprises the following steps: A, preparing GO / DMF dispersion liquid; B, dissolving a polyfunctional epoxy chain extender in DMF, adding a triphenylphosphine catalyst, and inducing a chemical reaction to obtain GO-epoxy powder; and C, carrying out meltblending on the dried PBAT, PLA and GO-epoxy powder through a circulating twin-screw internal mixer, and carrying out mold pressing to obtain the graphene reinforced and toughened biodegradable polyester composite sheet. According to the invention, epoxy resin grafted graphene oxide is used as a compatilizer and a reinforcing agent; the compatibility of the PBAT / PLA compound is improved, the tensile strength and elongation at break of the PBAT / PLA compound are improved, the tensile strength of the obtained graphene reinforced and toughened biodegradable polyester compound is 25-55 MPa, and the elongation at break of the obtained graphene reinforced and toughened biodegradable polyester compound is 100-600%. And high-pressure CO2 foaming is carried out to prepare the low-density, high-hardness, high-strength and high-toughness graphene reinforced and toughened biodegradable polyester composite foaming material.

Description

Technical field: [0001] The invention relates to the field of biodegradable polymer materials, in particular to graphene-enhanced and toughened biodegradable polyester composites and foam materials thereof. Background technique: [0002] Plastic, rubber, and synthetic fiber materials are widely used in people's production and life as synthetic polymer materials. These materials are difficult to degrade in the natural environment after use, and cause serious damage to soil, rivers, and oceans. Biodegradable plastics can be decomposed by microorganisms, and can even be degraded within a few weeks under composting conditions, and become nutrients that can be absorbed by animals and plants. The development of biodegradable plastics has attracted attention from all over the world. Foaming materials have the advantages of light weight, cushioning, and heat preservation. Biodegradable plastic foaming materials can significantly reduce the cost of materials and broaden the applicati...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L67/04C08K9/04C08K3/04C08J5/18C08J9/12
CPCC08L67/02C08J5/18C08J9/122C08J9/009C08J9/0061C08L2201/06C08L2203/14C08L2205/02C08J2367/02C08J2467/04C08J2203/06C08L67/04C08K9/04C08K3/042Y02W90/10
Inventor 翟文涛赵丹
Owner SUN YAT SEN UNIV
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