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A high-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and its preparation method

A functional composite material, electromagnetic shielding technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of poor dispersion and weak interface interaction, limited mechanical properties of polylactic acid, complex structure, etc., to achieve excellent antibacterial Effect and electromagnetic shielding function, good mechanical enhancement effect, effect of reducing pollution

Active Publication Date: 2022-06-24
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, due to the complex structure of lignin, the surface functional groups are not yet clear, its dispersion is not good and the interface interaction force is weak, so the mechanical properties of traditional lignin to PLA are limited, and unmodified lignin is not New functions cannot be endowed to polylactic acid materials, so it still limits its wide application, such as antibacterial packaging films, anti-electromagnetic shielding and other functional fields

Method used

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  • A high-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and its preparation method
  • A high-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and its preparation method
  • A high-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0035] A high-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties, the preparation method thereof comprises the following steps:

[0036] (1) Controllable preparation of nano-lignin

[0037] Measure 20ml of deionized water and add it to the ball mill tank, add 3g of native lignin, and use ultrasonic dispersion for 30min to obtain a uniformly dispersed composite solution. Finally, put the ball mill into the ball mill at 480 rpm and continue to react for 72 hours, then use a Buchner funnel to filter and wash to obtain the filter residue, and use a freeze dryer to freeze-dry for 48 hours to obtain nano-lignin.

[0038] (2) Preparation of zinc oxide / silver composites

[0039] 1 g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 12 mL of deionized water, then 6 mL of triethanolamine (TEA) was added to the solution and stirred at room temperature to dissolve completely; at the same time, 5.4 mg of FeCl3 6H2O was added to 200 mL...

Embodiment 2

[0043] A high-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties, the preparation method thereof comprises the following steps:

[0044] (1) Controllable preparation of nano-lignin

[0045] Controllable preparation of nano-lignin according to Example 1

[0046] (2) Preparation of zinc oxide / silver composites

[0047] Zinc oxide / silver composite preparation was performed as in Example 1.

[0048] (3) Preparation of multifunctional polylactic acid composites

[0049] At room temperature, 1.5g of PLA particles were first dissolved in 20mL of dichloromethane (PLA concentration 75-100mg / mL) and stirred for 8h to completely dissolve. After adding (2-6wt%) nano-lignin, stirring was continued for 12h, and 10wt% was added. % zinc oxide / silver composite was ultrasonicated for 1 h, stirred for 12 h, and then the solvent spectrum film was evaporated in a fume hood for 2 days to form a film to obtain a polylactic acid funct...

Embodiment 3

[0051] A high-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties, the preparation method thereof comprises the following steps:

[0052] (1) Controllable preparation of nano-lignin

[0053] Controllable preparation of nano-lignin according to Example 1

[0054] (2) Preparation of zinc oxide / silver composites

[0055] Zinc oxide / silver composite preparation according to Example 1

[0056] (3) Preparation of multifunctional polylactic acid composites

[0057] At room temperature, 1.5g PLA particles were first dissolved in 20mL of dichloromethane (PLA concentration 75-100mg / mL) and stirred for 8h to completely dissolve. After adding (2-6wt%) nano-lignin, stirring was continued for 12h, and 15wt% was added. % zinc oxide / silver composite was ultrasonicated for 1 h, stirred for 12 h, and then filmed with solvent, volatilized in a fume hood for 2 days to form a film to obtain a polylactic acid functional film material...

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Abstract

The invention discloses a high-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and a preparation method thereof. The composite material comprises the following components in parts by weight: 100 parts of polylactic acid, 2 to 6 parts of nano lignin, zinc oxide 5-15 parts per silver compound. The present invention is to carry out a controllable nanometerization of the original lignin, and prepare a zinc oxide / silver composite, and use the nano-lignin to disperse the zinc oxide / silver composite in situ and cast it with a polylactic acid solvent to prepare a composite with high mechanical properties. , excellent antibacterial performance and high-efficiency electromagnetic shielding function integrated polylactic acid composite material. The invention greatly broadens the scope of application of lignin, realizes the waste utilization of lignin resources, enables lignin to play the dual roles of enhancer and dispersant, and prepares a bio-based polylactic acid functional material with multiple functions based on integration, which can It meets the requirements of the harsh use environment in the market, and also conforms to the concept of green and sustainable development.

Description

technical field [0001] The invention belongs to the field of polylactic acid composite materials, and more particularly, relates to a high-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and a preparation method thereof. Background technique [0002] In recent years, with the deteriorating global environment and the scarcity of petroleum resources, the development of sustainable bio-based polymer environmentally friendly materials to replace traditional non-degradable thermoplastic materials has become a research hotspot in the industry and academia. Among them, polylactic acid, as a biodegradable polymer, has been widely studied by researchers due to its wide range of sources, such as starch and vegetable sugar. Polylactic acid can be degraded into carbon and water in the natural environment without causing secondary pollution, so it shows great application prospects in food packaging, biomedicine, aerospace...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L97/00C08K3/22C08K3/08H05K9/00
CPCC08L67/04H05K9/0081C08K2003/2296C08K2003/0806C08L97/005C08K3/22C08K3/08
Inventor 付宇蔡晨阳
Owner NANJING FORESTRY UNIV
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