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Polylactic acid antibacterial thin film and preparation method thereof

A polylactic acid and film technology, applied in the field of polylactic acid antibacterial film and its preparation, can solve problems such as barrier performance and antibacterial performance defects, and achieve the effects of improving barrier performance, easy surface effect and small size

Active Publication Date: 2018-04-20
XIAMEN AMESON NEW MATERIAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain defects in the barrier properties and antibacterial properties of polylactic acid itself, which need to be further improved.

Method used

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  • Polylactic acid antibacterial thin film and preparation method thereof
  • Polylactic acid antibacterial thin film and preparation method thereof
  • Polylactic acid antibacterial thin film and preparation method thereof

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preparation example Construction

[0024] A kind of preparation method of polylactic acid antibacterial film that the embodiment of the present invention provides, comprises the following steps:

[0025] S1, acid-treating the nano-layered clay to obtain acid-activated layered clay;

[0026] S2, dispersing the acid-activated layered clay in water, adding an aqueous solution of tannic acid, and after adsorption, adding an iron salt solution to obtain a reaction solution, and reacting the reaction solution for 0.8 to 1.5 minutes to obtain a modified layered clay;

[0027] S3, adding glutathione dropwise to the silver nitrate solution to obtain a nano-silver precursor;

[0028] S4, dispersing the modified layered clay in water, adding the nano-silver precursor under ice bath conditions, stirring and reacting, filtering and drying to obtain nano-silver loaded modified layered clay;

[0029] S5, mixing the nano-silver loaded modified layered clay and polylactic acid to form a film.

[0030] Further, in a preferred ...

Embodiment 1

[0048] An antibacterial polylactic acid film provided in this embodiment is prepared according to the following steps.

[0049] (1) Weigh 0.18 mol of magnesium chloride, 0.08 mol of aluminum chloride and 0.385 mol of urea and dissolve them in deionized water, then sonicate for 30 minutes, transfer to an autoclave, and then put them in a muffle furnace at 160°C for 6 hours , after the reaction, filter and wash to obtain LDHs powder.

[0050] (2) Disperse 0.3g of LDHs in 50ml of deionized water, sonicate for 30min, add 5ml of 0.01M HCl and react at 60°C for 2.5h. After the reaction, wash by centrifugation and freeze-dry to obtain acid-activated LDHs.

[0051] (3) Prepare TA aqueous solution and FeCl with a concentration of 24mM respectively 3 aqueous solution.

[0052] (4) Add 0.06g of acid-activated LDHs into 50ml of deionized water, sonicate for 45min, then add 0.5ml of TA aqueous solution (0.02gTA), after fully adsorbed, add 0.2ml of FeCl 3 Aqueous solution (0.0008g FeCl ...

Embodiment 2

[0058] An antibacterial polylactic acid film provided in this embodiment is prepared according to the following steps.

[0059] (1) Weigh 0.18 mol of magnesium chloride, 0.08 mol of aluminum chloride and 0.385 mol of urea and dissolve them in deionized water, then sonicate for 30 minutes, transfer to a high-pressure reactor, and first heat up to 120 ℃ at 4 ℃ / min for 3 hours , and then heated at 1°C / min to 160°C for 4h to obtain LDHs powder.

[0060] (2) Disperse 0.3g of LDHs in 50ml of deionized water, sonicate for 30min, add 5ml of 0.01M HCl and react at 60°C for 2.5h. After the reaction, wash by centrifugation and freeze-dry to obtain acid-activated LDHs.

[0061] (3) Prepare TA aqueous solution and FeCl with a concentration of 24mM respectively 3 aqueous solution.

[0062] (4) Add 0.06g of acid-activated LDHs into 50ml of deionized water, sonicate for 45min, then add 0.5ml of TA aqueous solution (0.02gTA), after fully adsorbed, add 0.2ml of FeCl 3 Aqueous solution (0.000...

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Abstract

The invention provides a polylactic acid antibacterial thin film and a preparation method thereof, and relates to the technical field of polymer materials. The preparation method includes the steps: carrying out acid activation treatment of layered clay LDHs; then forming an organic coating material of tannic acid and ferric ions on the surface of the acid activated LDHs, to obtain LDHs@TA-Fe (III); adding glutathione to a silver nitrate solution to obtain a nano silver precursor, and carrying out a reaction of the LDHs@TA-Fe (III) with the nano silver precursor to obtain nano silver loaded modified layered clay; and finally, mixing the nano silver loaded modified layered clay and polylactic acid to form a film, and thus obtaining the polylactic acid antibacterial thin film which has excellent mechanical properties, barrier properties and antibacterial properties.

Description

technical field [0001] The invention relates to the field of polymer materials, and in particular to a polylactic acid antibacterial film and a preparation method thereof. Background technique [0002] Nano-layered clays, namely layered double metal hydroxides (LDHs), have become a new type of inorganic antibacterial materials due to their high specific surface area, chemical stability and heat resistance, and will not make bacteria resistant. At the same time, silver nanoparticles are currently the most potential inorganic antibacterial materials. Silver ions released from unstable silver nanoparticles have excellent biocidal effects and exhibit remarkable broad-spectrum antibacterial properties. Silver nanoparticles can only obtain high-performance antibacterial activity under the premise of uniform morphology and narrow particle size distribution. However, silver nanoparticles tend to agglomerate strongly due to the high surface area to volume ratio, so it is necessary t...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K9/12C08K3/08C08K7/00C08K9/04C08K3/34C08J5/18
CPCC08J5/18C08J2367/04C08K3/346C08K7/00C08K9/04C08K9/12C08K2003/0806C08K2201/011
Inventor 毛龙刘跃军吴慧青姚进郑思洁刘静怡
Owner XIAMEN AMESON NEW MATERIAL INC
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