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Polylactic acid/modified graphene oxide antibacterial plastic and preparation method

A technology of antibacterial plastics and polylactic acid, which is applied in the field of polylactic acid/modified graphene oxide antibacterial plastics and its preparation, can solve the problems of affecting antibacterial performance and agglomeration of nano antibacterial agents, so as to improve antibacterial activity, good system compatibility, Wide range of antibacterial effects

Active Publication Date: 2014-09-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, directly adding this nano-antibacterial agent into the plastic matrix will easily lead to the agglomeration of the nano-antibacterial agent, which will affect its original antibacterial performance to a certain extent.

Method used

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  • Polylactic acid/modified graphene oxide antibacterial plastic and preparation method
  • Polylactic acid/modified graphene oxide antibacterial plastic and preparation method

Examples

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preparation example Construction

[0026] A preparation method of polylactic acid / modified graphene oxide antibacterial plastics, comprising the following steps:

[0027] (1) Preparation of composite antibacterial agent: dry the graphene oxide prepared by the Hummers method and disperse it uniformly in ethanol by ultrasonic, add zinc acetate under heating conditions and keep stirring to make it fully mixed and dissolved, and slowly add hydrogen after the solution boils Sodium oxide solution, after the reaction is completed, the product is centrifuged and washed to neutrality, and vacuum-dried;

[0028] (2) Use the low boiling point solvent chloroform to blend the polylactic acid and the compound antibacterial agent in proportion to the solution, use an automatic film coating machine to coat the mixed solution on a clean glass plate, let the solvent evaporate naturally at room temperature, and finally put it in warm water After the film is removed in the middle, it is placed in an oven and dried to obtain the po...

Embodiment 1

[0036] Example 1: Weigh 10g of polylactic acid and dissolve it in 40mL of chloroform, and stir it magnetically for 2 hours to fully dissolve it. Weigh 0.02g of composite antibacterial agent and disperse it in 20mL of chloroform, and ultrasonically disperse it for 1.5h to make it evenly dispersed. Then the two dispersions were mixed and stirred, and blended for 4h. Use an automatic film coater to coat the mixed solution on a glass plate into a film of 1.5 mm, then allow chloroform to volatilize naturally for 24 hours at room temperature, remove the mold with warm water, and dry it in vacuum at 60 ° C for 48 hours to obtain the polylactic acid of the present invention / Modified graphene oxide antibacterial plastic. Antibacterial rate test results: Staphylococcus aureus 99.2%; Escherichia coli 97.6%.

Embodiment 2

[0037] Example 2: Weigh 10 g of polylactic acid and dissolve it in 40 mL of chloroform, and stir it magnetically for 2 hours to fully dissolve it. Weigh 0.05g of composite antibacterial agent and disperse it in 20mL of chloroform, and ultrasonically disperse it for 1.5h to make it evenly dispersed. Then the two dispersions were mixed and stirred, and blended for 4h. Use an automatic film coater to coat the mixed solution on a glass plate into a film of 1.5 mm, then allow chloroform to volatilize naturally for 24 hours at room temperature, remove the mold with warm water, and dry it in vacuum at 60 ° C for 48 hours to obtain the polylactic acid of the present invention / Modified graphene oxide antibacterial plastic. Antibacterial rate test results: Staphylococcus aureus 99.9%; Escherichia coli 98.5%.

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Abstract

The invention discloses polylactic acid / modified graphene oxide antibacterial plastic and a preparation method. The antibacterial plastic is composed of polylactic acid matrix resin and a composite antibacterial agent. The composite antibacterial agent is graphene oxide sheets with the surfaces loaded with zinc oxide nano-particles. The preparation method of the antibacterial plastic comprises the following steps that a trichloromethane solution of polylactic acid and a trichloromethane dispersing solution of the composite antibacterial agent are blended according to a certain ratio with a solution blending method, a clean glass plate is coated with the mixed solution through an automatic coating machine, and the solution is naturally volatilized at a room temperature. The polylactic acid / modified graphene oxide antibacterial plastic is obvious in antibacterial effect, wide in antibacterial range, biodegradable, safe, reliable, free from peculiar smell, and low in degree of harm and pollution to the human body and the environment.

Description

technical field [0001] The invention relates to the field of antibacterial technology of polylactic acid materials, in particular to a polylactic acid / modified graphene oxide antibacterial plastic and a preparation method thereof. Background technique [0002] In recent years, with the enhancement of people's awareness of environmental protection, biodegradable plastics have received increasing attention from researchers. Polylactic acid (PLA) has good biocompatibility and biodegradability, and the degradation products in the organism are carbon dioxide and water, without any adverse effects on organisms and the environment. At present, polylactic acid has a wide range of applications in the fields of packaging, automobile industry, drug delivery and tissue engineering. However, because the oligomers produced by the decomposition of polylactic acid are easily contaminated by various bacteria, bacteria can easily reproduce under suitable temperature and humidity conditions, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/00C08K3/04C08K3/22
Inventor 王新龙黄颖廖逢辉居亚庆王通文周露杨媛媛史加新
Owner NANJING UNIV OF SCI & TECH
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