Polylactic acid anti-bacterial-activity packaging material and preparation method thereof

Abstract

The invention discloses a polylactic acid anti-bacterial-activity packaging material and a preparation method thereof and belongs to the technical field of macromolecule. The anti-bacterial-activity packaging material includes, in a blending manner, a matrix resin and natural anti-bacterial plant essential oil, wherein the matrix resin accounts 100 parts by weight and the natural anti-bacterial plant essential oil accounts 2-10 parts by weight. The matrix resin is blended by polylactic acid and polytrimethylenecarbonate with a weight ratio of the polylactic acid to the polytrimethylenecarbonate being (60-90):(40-10). The natural anti-bacterial plant essential oil includes clove essential oil, cinnamon essential oil, fennel essential oil and lemongrass essential oil, thyme essential oil or origanum vulgare essential oil. The ingredients are blended in a double-screw extruder and are prepared into the novel polylactic acid anti-bacterial-activity packaging material through a film blowing machine. The material has a certain tensile strength and a certain elongation at break, can be biologically degraded completely, has an excellent anti-bacterial activity and can be widely applied in the field of packaging.

Description

technical field [0001] The invention relates to a polylactic acid antibacterial active packaging material and a preparation method thereof, belonging to the technical field of polymers. Background technique [0002] At present, in the food processing industry at home and abroad, most of the food is circulated in the market through packaging. At present, chemically synthesized plastic products are widely used in food packaging and fresh-keeping due to their low price, stable properties, excellent barrier properties, and heat resistance. However, the rapid development of the plastics industry and the substantial increase in the number of products have brought about some serious problems: First, most of the materials used in food packaging cannot be degraded by the environment, leading to increasingly serious environmental pollution problems; second, the current plastics The raw materials of products (such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.) ...

AI Technical Summary

Problems solved by technology

However, the rapid development of the plastics industry and the substantial increase in the number of products have brought about some serious problems: First, most of the materials used in food packaging cannot be degraded by the environment, leading to increasingly serious environmental pollution problems; second, the current plastics The raw materials of products (such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.) are non-renewable resources - petroleum, and its world reserves will face depletion in about 40 years, and the plastic industry that uses petroleum as raw material will also be exhausted. Facing a shortage of raw materials

[0005] Although many scholars at home and abroad have introduced the preparation of polylactic acid antibacterial active packaging materials, they have not mentioned the use of polylactic acid / polytrimethylene carbonate blended materials as the base material, adding natural antibacterial plant essential oils to prepare polylactic acid with antibacterial activity. Research on food antibacterial active packaging materials with excellent mechanical properties