Degradable packaging bags mean that they can be degraded, but degradable packaging bags are divided into two types: “degradable” and “fully degradable”. Degradable packaging bag refers to adding a certain amount of additives (such as starch, modified starch or other cellulose, photosensitizers, biodegradants, etc.) during the production process to reduce its stability, and then it is easier to be in the natural environment Degradable plastic packaging bags.
Fully degradable packaging bag means that the plastic packaging bag is completely degraded into water and carbon dioxide. The main source of this fully degradable material is processed from corn and cassava into lactic acid, which is PLA.
Polylactic acid (PLA) is a new type of biological substrate and renewable biodegradable material. Starch raw materials are saccharified to obtain glucose, which is then fermented by glucose and certain strains to produce high-purity lactic acid, and then a certain molecular weight polylactic acid is synthesized by chemical synthesis. It has good biodegradability. After use, it can be completely degraded by microorganisms in nature under specific conditions, and finally carbon dioxide and water are generated without polluting the environment. This is very beneficial to protecting the environment and is an environmentally friendly material for workers.
At present, the main bio-based material of fully degradable packaging bags is composed of PLA+PBAT. In the case of composting (60-70 degrees), it can be completely decomposed into water and carbon dioxide in 3-6 months, which does not pollute the environment. Why do you want to add PBAT? Professional flexible packaging manufacturers tell me here.
PBAT is a copolymer of adipic acid, 1,4-butanediol, and terephthalic acid. It is a chemically synthesized aliphatic-aromatic polymer that can be excessively biodegradable. PBAT has excellent flexibility and can be used for film extrusion, blowing processing, extrusion coating and other molding processing. The purpose of blending PLA and PBAT is to improve PLA’s toughness, biodegradation and molding processing properties. PLA and PBAT are incompatible, so choosing a suitable compatibilizer can significantly improve the performance of PLA.