According to the source of raw materials, biodegradable plastics can be divided into biodegradable plastics and biodegradable plastics based on petrochemical.
Biodegradable plastics can be divided into four categories: the first category is the plastics directly processed by natural materials. At present, biodegradable plastics produced by natural polymers in the market mainly include thermoplastic starch, bio-cellulose, polysaccharides and polyamino acids, as well as the products of their blending modification and chemical modification.The second type is the polymer obtained by microbial fermentation and chemical synthesis, such as PLA.The third type of polymers are those directly synthesized by microorganisms, such as PHA.The fourth category is the biodegradable plastics obtained by blending the above materials or by blending these materials with other chemically synthesized biodegradable plastics.
Biodegradable petrochemical plastics refer to the plastics obtained by chemical synthesis of the monomers of petrochemical products, such as polyterephthalic acid-butanedioic acid (PBAT), polybutanedioic acid (PBS), carbon dioxide copolymer (PPC), polyglycolic acid (PGA), etc.