Fossil-based biodegradable plastics: PBAT and PBS petroleum-based biodegradable plastics are biodegradable plastics produced by polymerization of monomers produced in the petrochemical industry chain. These plastics mainly include polybutylene succinate (PBS)/polybutylene succinate-adipate (PBSA), polycaprolactone (PCL) and polybutylene succinate-terephthalate (PBAT).
1. Poly (epsilon-caprolactone) (PCL)
Poly (epsilon-caprolactone) (PCL) is a low melting point polymer obtained by ring-opening polymerization of epsilon-caprolactone. Its melting point is only 62 C. The degradation of PCL has been studied since 1976. In anaerobic and aerobic environments, PCL can be completely decomposed by microorganisms.
Compared with PLA, PCL has better hydrophobicity, but its degradation rate is slower; together, its synthesis process is simple and its cost is lower. PCL has excellent processing function. It can be made into film and other products by ordinary plastic processing equipment.
Together, PCL and a variety of polymers have good compatibility, such as PE, PP, PVA, ABS, rubber, cellulose and starch. Through blending and copolymerization, excellent information can be obtained. Especially its blending or copolymerization with starch can not only maintain its biodegradability, but also reduce its cost, so it has attracted much attention.
PCL can be blended with starch to obtain degradable plastics with good water resistance, and its price is near the paper. In situ polymerization method can be used to graft epsilon-caprolactone with starch to obtain thermoplastic polymers with excellent functions.
Compared with similar products, the advantages of polyester biodegradable plastics are as follows:
1) One of the fatal shortcomings of the above-mentioned biodegradable plastics (polylactic acid, poly-epsilon-caprolactone, polyhydroxyalkyl ester) is its poor heat resistance, which affects its application and promotion in catering field.
2) The processing conditions of the above-mentioned biodegradable plastics (polylactic acid, poly-epsilon-caprolactone, polyhydroxyalkyl ester) are harsh, and there are some difficulties in industrialization.
3) Polylactic acid (PLA) is a water-degradable bioplastics. It can not withstand water molecules during storage, and its function can not be guaranteed during general storage and normal use.
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