Polylactic acid fresh-keeping film containing natural antibacterial ingredients and preparation method thereof

Abstract

The invention relates to a polylactic acid fresh-keeping film containing natural antibacterial ingredients and a preparation method thereof, is used for solving the problems that a conventional antibacterial fresh-keeping film has complex processing, volatile antibacterial materials have large loss in the processing process and white pollution of a packaging film is serious. A single face or double faces of a modified polylactic acid thin film are coated with an antibacterial coating layer containing a fig branch extract, wherein the modified polylactic acid thin film is prepared by taking polylactic acid resin REVODE110 as a base material, adding nano copper CW-Cu-001 and blowing; the antibacterial coating layer is preapred by adding an acrylic acid-hydroxypropyl acrylate copolymer, hydroxypropyl acrylate and an initiator BP1173 to the fig branch ethyl acetate extract and mixing; the modified polylactic acid thin film is coated with the antibacterial coating layer, then the coated modified polylactic acid thin film is irradiated and cured by an ultraviolet light, and thus the polylactic acid fresh-keeping film is obtained .

Description

[0001] Technical field: [0002] The invention relates to an antibacterial fresh-keeping film and a preparation method thereof. [0003] Background technique: [0004] At present, there are three main methods of antibacterial fresh-keeping film developed at home and abroad: first, the film material is mixed with antibacterial agents before forming, such as nano-silver, nano-zinc and other antibacterial agents as antibacterial materials; The molecular material is used as the base material, and the antibacterial agent is mixed to form a film; thirdly, the natural volatile antibacterial material is mixed into the resin, and the film is extruded and blown at high temperature. Among these three methods, the first one has been popularized and used in a small range of small-scale products, and the second and third methods are mainly studied in the laboratory. The reason is that the antibacterial fresh-keeping film material prepared by the first method mainly has a contact sterilizati...

AI Technical Summary

Problems solved by technology

The reason is that the antibacterial fresh-keeping film material prepared by the first method mainly has a contact sterilization mechanism, that is to say, the antibacterial agent on the film material can only be sterilized after being in contact with the wrapped object; the second method, Due to the long film forming period of the material, the mechanical strength of the material after film formation is not ideal, which limits its application; the third method, due to the low boiling point of the volatile antibacterial material, will be lost during the process of processing by the usual thermal processing method. A large amount of antibacterial materials will generate huge waste and affect the effect

Therefore up to the present, the product of the second and the 3rd mode also does not have the report that product promotes in the market

There is another problem worthy of attention. The packaging film materials used in large quantities in the storage and transportation of fruits and vegetables are all disposable non-degradable products. The problem of white pollution caused by direct discarding after use has always been a social problem that needs to be solved.