Preparation method of polylactic acid material

Abstract

The invention discloses a preparation method of a polylactic acid material. The preparation method comprises the following steps: (1) dispersing an antimicrobial compound in lactic acid to prepare a solution with the concentration of 0.1-2g / L, and performing ultrasonic stirring for 60-90min to obtain an antibacterial lactic acid solution; (2) dispersing a conductive filler in lactic acid to prepare a solution with the concentration of 1-2g / L, and performing ultrasonic stirring for 60-90min to obtain a conductive lactic acid solution; (3) mixing the antibacterial lactic acid solution and the conductive lactic acid solution according to a volume ratio of 2: 1, putting the mixed solution into a vacuum drying oven with the temperature of 50-80 DEG C, and performing vacuum drying for 24-36h till the mixed solution has no residual water to obtain the polylactic acid material through direct condensation. Through scientific compatibility of the antimicrobial compound and the conductive filler and under a synergistic action of raw materials, the polylactic acid material not only has an antibacterial property, but also has an antistatic function, so that the application range of the polylactic acid material is further widened.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a preparation method of a 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). More...

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

The existing polylactic acid material has a single function, and it is difficult to meet the multi-functional characteristics

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