With the increase of energy prices and the increasingly prominent environmental problems, the pace of biodegradable materials replacing traditional petroleum products in the world shows a gradual acceleration trend. It is expected that the government will also promulgate relevant preferential policies and laws and regulations to encourage the use of shopping malls, and the prospect of large-scale use of biodegradable materials is optimistic.
Biodegradable materials include macromolecule materials directly prepared by biotechnology, such as polyhydroxyalkyl fatty acid ester (PHA), polylactic acid (PLA), polybutylene succinate (PBS), polyamino acid and so on, and starch-based biodegradable plastics and carbon dioxide copolymer aliphatic polycarbonate (APC). And so on.
Starch-based biodegradable plastics is a kind of plastics product which is made by blending starch with other polymers after modification and grafting reaction. It can replace general plastics in industry, and can be used as packaging materials, shock-proof materials, plastic film, food containers, toys and so on.
PLA is a kind of bio-environmental protection material which can truly achieve ecological and economic effects. It is the most active and fastest-developing biodegradable plastics in recent years.
Polybutylene succinate is obtained by condensation of succinic acid and butylene glycol. It is recognized as the best biodegradable plastics in the world. Due to its excellent inductive function, reasonable cost performance and wide application, PBS can be used in packaging, tableware, cosmetics bottles and drug bottles, disposable medical supplies, agricultural films, slow-release materials of pesticides and fertilizers, biomedical polymer materials and other fields.
Polyhydroxyalkanoate is a kind of intracellular polyester, which is attributed to natural macromolecule polyester and is composed of many bacteria under specific conditions. More than 90 genera of bacteria have been found to form PHA with more than 150 different structures. At present, the commercialized PHA products mainly include Polyhydroxybutyric acid (PHB), copolymer of hydroxybutyric acid and hydroxy valeric acid (PHBV) and copolymer of hydroxybutyric acid and hydroxy hexanoic acid (PHBHx).
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