Preparing method of antibacterial polylactic acid material

Abstract

The invention discloses a preparing method of an antibacterial polylactic acid material. The method comprises the steps of 1, dispersing antibacterial compound into lactic acid, preparing solution with a concentration of 0.1-2g / L, conducting ultrasonic agitation (500-800W ultrasonic power at a rate of agitation of 500-800rpm) for 60-90min to obtain antibacterial lactic acid solution; 2, placing the antibacterial lactic solution into a vacuum oven at a temperature of 50-80 DEG C to vacuum dry for 24-36h until no redundant water is in the mixed liquor; obtaining the antibacterial polylactic acid material through direct condensing method. According to the antibacterial compound method, grapheme quantum dots after laser irradiation are adopted as the carrier of silver, then covered with silicon dioxide lamella for surface treatment, and finally adhered on porous grapheme, which can better load and fix silver nano particles, prevent the silver nano particles from agglomeration and remarkably improve the stability of the silver nano particles and enable longer antibacterial activity of the silver nano particles; application of the antibacterial compound on polylactic acid fiber film enables lasting and effective antibacterial activity and properties of high stability, broad-spectrum antibacterial and biodegradation.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a preparation method of an antibacterial polylactic acid material. Background technique [0002] Polylactic acid (PLA) is a polymer compound polymerized with lactic acid as the main raw material. It belongs to a type of lactide polyester. It is made of starch raw materials proposed by renewable plant resources (such as corn). Starch The raw material is made into lactic acid through the fermentation process, and then converted into polylactic acid through chemical synthesis, and the production process is pollution-free. After use, polylactic acid products can be completely degraded by microorganisms in nature, and finally generate carbon dioxide and water without polluting the environment. Even if polylactic acid is incinerated, its combustion calorific value is the same as that of incinerated paper, which is half that of incinerated traditional plastics (such as polyethylene). ...

AI Technical Summary

Problems solved by technology

[0003] The antibacterial agent in polylactic acid antibacterial products is not added in the form of antibacterial masterbatch. The production process of antibacterial masterbatch is to mix the antibacterial agent and matrix resin first, process it into a thread through a twin-screw extruder, and then pass it through a dryer at high temperature. Drying, granulation to obtain antibacterial masterbatch, using this method to process polylactic acid antibacterial masterbatch, drying at high temperature in the dryer will lead to thermal degradation of polylactic acid again, resulting in product performance degradation

And because the nano-silver antibacterial agent is granular and the particle size is nano-level, it can only be gathered in a specific part of the polylactic acid material and cannot be evenly distributed on the surface, thereby affecting the antibacterial effect; on the other hand, nano-silver and polylactic acid materials cannot Tightly combined (especially when the content of nano-silver particles increases, agglomeration is prone to occur), and it is easy to fall off during use, thus affecting the service life and antibacterial effect

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