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Green and environment-friendly toughened strong-antibacterial degradable polylactic acid composite and preparation method thereof

A technology of green environmental protection and composite materials, which is applied in the field of polymer composite materials, can solve the problems of limiting the application of polylactic acid composite materials, low mechanical properties, processing performance and thermal performance, and achieve the improvement of mechanical and thermal properties, mechanical properties, Effect of improving dispersion and compatibility

Inactive Publication Date: 2015-10-28
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that PLA / nano-ZnO / CCA has low mechanical properties, processability, thermal properties, etc., which severely limit the application of polylactic acid composite materials, the purpose of the present invention is to provide a method to ensure that PLA / nano-ZnO / CCA Under the premise of strong antibacterial properties of composite materials, improve the mechanical properties and thermal properties of polylactic acid composite antibacterial materials, while retaining its environmental protection and biodegradable properties, and expand its application fields. Preparation

Method used

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  • Green and environment-friendly toughened strong-antibacterial degradable polylactic acid composite and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step (1) Preparation of CCA: Weigh 3.33 parts of sodium chlorophyll cuprate into a round bottom flask filled with distilled water, stir mechanically for a certain period of time, add 0.56 parts of hydrochloric acid, continue stirring to precipitate the solution, and vacuum filter to obtain The CCA precipitate was washed repeatedly with distilled water until neutral, dried, weighed, and stored for future use.

[0045] Step (2) Surface treatment of nano-ZnO: Add 9 parts of nano-ZnO into a flask containing 30 ml of 95% ethanol aqueous solution, shake well, ultrasonically disperse at room temperature for 1.5 h, add 0.27 parts of KH550, and ultrasonically Vibrate for 1.5h, and stir on a magnetic stirrer for 1.5h, centrifuge, wash with ethanol, dry in a blast drying oven at 60°C, and set aside.

[0046] Step (3) Preparation of antibacterial masterbatch: Add the CCA obtained in step (1) and the modified nano-ZnO obtained in step (2) into a beaker containing 500ml of chlorofor...

Embodiment 2

[0050] Step (1) Preparation of CCA: Weigh 3.89 parts of sodium chlorophyll cuprate into a round-bottomed flask filled with distilled water, stir mechanically for a certain period of time, add 0.65 parts of hydrochloric acid, and continue stirring to precipitate the solution. The CCA precipitate was obtained by vacuum filtration, washed repeatedly with distilled water until neutral, dried, weighed, and stored for future use.

[0051]Step (2) Surface treatment of nano-ZnO: Add 10.7 parts of nano-ZnO into a flask containing 30 ml of 95% ethanol aqueous solution, shake well, ultrasonically disperse at room temperature for 1.5 h, add 0.32 parts of KH550, and ultrasonically Vibrate for 1.5h, and stir on a magnetic stirrer for 1.5h, centrifuge, wash with ethanol, dry in a blast drying oven at 60°C, and set aside.

[0052] Step (3) Preparation of antibacterial masterbatch: add the CCA obtained in step (1) and the modified nano-ZnO obtained in step (2) into a beaker containing 500ml of...

Embodiment 3

[0056] Step (1) Preparation of CCA: Weigh 4.44 parts of sodium chlorophyll cuprate into a round-bottomed flask filled with distilled water, stir mechanically for a certain period of time, add 0.73 parts of hydrochloric acid, and continue stirring to precipitate the solution. The CCA precipitate was obtained by vacuum filtration, washed repeatedly with distilled water until neutral, dried, weighed, and stored for future use.

[0057] Step (2) Surface treatment of nano-ZnO: Add 12 parts of nano-ZnO into a flask containing 30 ml of 95% ethanol aqueous solution, shake well, ultrasonically disperse at room temperature for 1.5 h, add 0.36 parts of KH550, and ultrasonically Vibrate for 1.5h, and stir on a magnetic stirrer for 1.5h, centrifuge, wash with ethanol, dry in a blast drying oven at 60°C, and set aside.

[0058] Step (3) Preparation of antibacterial masterbatch: add the CCA obtained in step (1) and the modified nano-ZnO obtained in step (2) into a beaker containing 500ml of ...

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Abstract

The invention discloses a green and environment-friendly toughened strong-antibacterial degradable polylactic acid composite and a preparation method thereof. The composite is prepared from, by weight, 1000 parts of polylactic acid, 3-18 parts of chain extender, 7-20 parts of nanometer zinc oxide, 0.20-0.55 part of coupling agent and 1-8 parts of chlorophyll copper acid. According to the visible light absorption and transmission principle of the chlorophyll copper acid, with the nanometer zinc oxide processed by the chlorophyll copper acid and the coupling agent as a composite antibacterial agent, the visible light utilization rate of the nanometer zinc oxide is increased; through the environment-friendly small-molecule chain extender, the molecular weight of the polylactic acid is improved, the composite has the strong antibacterial performance, and the mechanical property and thermal property are improved; meanwhile, the greenness, environmentally friendliness and complete degradability characteristics of the polylactic acid are kept. Through the simple preparation process, the green and environment-friendly completely-degradable polylactic acid composite with strong antibacterial performance, the improved mechanical property and the improved thermal property is obtained.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and relates to a green, environmentally friendly, toughened, strong antibacterial and degradable polylactic acid composite material and a preparation method thereof. Background technique [0002] With the deterioration of environmental problems, antibacterial materials are gradually developing in the direction of green, environmental protection and health. Polylactic acid (PLA) is recognized as the most potential bio-based degradable polymer material, and has been widely used in agriculture, industry, packaging, and medicine. PLA composite antibacterial materials have also become a hot research topic. [0003] Nano-zinc oxide (nano-ZnO) has become a hotspot in the research and application of antibacterial materials due to its low price, white appearance, and UV resistance. However, as an antibacterial agent, nano-ZnO can only exert photocatalytic antibacterial effect under ul...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K9/06C08K3/22C08K5/00
Inventor 樊卫华郭凯陈金周赵月赵坤章霭靜张臻臻
Owner ZHENGZHOU UNIV
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