PLA/PBAT composite film has the characteristics of excellent mechanical strength, strong barrier properties, and degradability. It can be used as a new food packaging material to replace traditional food packaging materials such as polyethylene PE. At the same time, adding active factors to the PLA/PBAT composite film can Effectively extend the shelf life of food and reduce the loss of nutritional value of food during storage. At present, research on the application of PLA/PBAT composite films in food packaging mainly focuses on gas selective permeability, antibacterial properties, and food storage and preservation.
Gas selective permeability
As consumers pursue a high-quality food experience, higher requirements are placed on the oxygen and water vapor barrier properties of food packaging films.
The PLA/PBAT composite membrane has certain gas selective permeability and has a good regulating effect on internal O2 and CO2. The gas selective permeability of PLA/PBAT composite membranes varies depending on the addition of different ingredients. For example, the PLA/PBAT composite membrane added with grape seed extract has high moisture permeability and gas selective permeability, and can effectively prevent The packaging film fogs up, giving it good application prospects in fruit and vegetable packaging. When BHT is added to the PLA/PBAT composite film, the barrier properties of the film are improved. In the future, it can be considered for application in food preservation packaging to reduce the loss of nutritional value and extend the shelf life.
Antibacterial properties
Good antibacterial and antibacterial effects are key factors in extending the shelf life of food.
The PLA/PBAT blend can be mixed with metal particles such as silver oxide and zinc oxide or plant essential oils and other raw materials to prepare an active composite film. The composite film has good antibacterial activity and can effectively delay food spoilage, reduce the loss of its nutritional value, and improve The quality and safety of food during storage is a green food preservation technology. Its application in cold fresh meat and aquatic products will be the future development trend. It can extend the shelf life of cold fresh meat and aquatic products and improve the quality and preservation of food. Has great application potential.
Storage and freshness performance
PLA/PBAT composite film has good UV shielding function and can reduce the moisture content and water activity in food. It can effectively reduce moisture and nutrient losses during the storage of fresh fruits and vegetables, extend the shelf life, and improve sensory quality. It plays a very good role in preserving the freshness of fresh fruits and vegetables. It can be used as a packaging material for fresh food in long-distance transportation, deep-sea voyages and other scenarios to ensure the quality and taste of fresh food.
