Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and preparation method thereof

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

Active Publication Date: 2021-06-01
NANJING FORESTRY UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and preparation method thereof
  • High-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and preparation method thereof
  • High-strength polylactic acid functional composite material with antibacterial and electromagnetic shielding properties and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0037] Measure 20ml of deionized water into the ball mill jar, 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 and continue to react at 480rpm for 72 hours, filter and wash with a Buchner funnel to obtain filter residue, and freeze-dry for 48 hours with a freeze dryer to obtain nano-lignin.

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

[0039] 1g 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 completely dissolve; at the same time, 5.4 mg of FeCl3·6H2O was added to 200 mL of ethylene glycol ( E...

Embodiment 2

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

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

[0045] Carry out the controllable preparation of nano-lignin according to example 1

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

[0047] Zinc oxide / silver composite preparation was carried out according to Example 1.

[0048] (3) Preparation of multifunctional polylactic acid composite materials

[0049] Dissolve 1.5g PLA particles in 20mL of dichloromethane (PLA concentration 75-100mg / mL) at room temperature and stir for 8h to completely dissolve, add (2-6wt%) nano lignin and continue stirring for 12h, add 10wt % of the zinc oxide / silver complex was ultrasonicated for 1 hour, stirred for 12 hours, solvent-spectrum filmed, and volatilized in a fume hood for 2 days to form a film to obtain a polylactic acid functional f...

Embodiment 3

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

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

[0053] Carry out the controllable preparation of nano-lignin according to example 1

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

[0055] Carry out zinc oxide / silver composite preparation according to example 1

[0056] (3) Preparation of multifunctional polylactic acid composite materials

[0057] Dissolve 1.5g PLA particles in 20mL of dichloromethane (PLA concentration 75-100mg / mL) at room temperature and stir for 8h to completely dissolve, add (2-6wt%) nano lignin and continue stirring for 12h, add 15wt % of the zinc oxide / silver complex, ultrasonicated for 1 hour, stirred for 12 hours, then solvent-coated, and volatilized in a fume hood for 2 days to form a film to obtain a polylactic acid functional film material. ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

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, 2-6 parts of nano lignin and 5-15 parts of a zinc oxide / silver compound. The preparation method comprises the following steps: performing controllable nanocrystallization on native lignin, preparing a zinc oxide / silver compound, performing in-situ dispersion on the zinc oxide / silver compound by utilizing nano lignin, and casting with a polylactic acid solvent to obtain the polylactic acid composite material integrating high mechanical property, excellent antibacterial property and an efficient electromagnetic shielding function. The application range of the lignin is greatly widened, waste utilization of lignin resources is achieved, the lignin can serve as a reinforcing agent and a dispersing agent, the bio-based polylactic acid functional material integrating multiple functions is prepared, the requirement for the strict use environment in the market can be met, and the concept of green and sustainable development is also met.

Description

technical field [0001] The invention belongs to the field of polylactic acid composite materials, and more specifically 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 environmental protection 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 dioxide and water in the natural environment without causing secondary pollution, so it shows great application prospects in food packaging, biomedicine, ae...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com