Biodegradable polyester composition used for shopping bag

Abstract

The invention relates to a biodegradable polyester composition used for a shopping bag. The biodegradable polyester composition is characterized by comprising the following components in parts by weight: 80 to 120 parts of aliphatic-aromatic copolyester PBAT with a weight-average molecular weight of 50,000 to 100,000, 20 to 40 parts of aliphatic polyester which is at least one selected from the group consisting of PLA, polyhydroxyalkanoate PHA, PBS and polypropylene carbonate PPC, 0.5 to 5 parts of a compatibilizer and 0 to 1 part of an antioxidant, wherein the compatibilizer is a terpolymer of methoxy polyethyleneglycol methacrylate, (methyl)hydroxy acrylate and (methyl)acrylamide; and a preparation method for the compatibilizer comprises the following steps: adding deionized water into areactor, introducing nitrogen gas, carrying out heating, simultaneously and respectively dropwise adding a monomer mixed solution and an initiator aqueous solution, carrying out a reaction with a reaction temperature of 70 to 90 DEG C, and carrying out stirring at a constant temperature, wherein the molar ratio of methoxy polyethyleneglycol methacrylate, (methyl)hydroxy acrylate and (methyl)acrylamide is 1: (2-5): (2-4); and carrying out dropwise adding for 3 to 4 h, carrying out heat-preserving for 1 to 2 h, then carrying out cooling to a room temperature, and adding a pH regulator until a pH value of an solution is neutral. The composition provided by the invention has the following advantages: mechanical properties are excellent; tensile strength is 35 MPa or above; elongation at breakis 700% or above; and the biodegradation rate is controlled to be 90% or above.

Description

technical field [0001] The invention relates to the field of biodegradable polyester compositions, in particular to a biodegradable polyester composition for shopping bags and a preparation method thereof. Background technique [0002] The development of degradable and environmentally friendly polymer materials applied to thin films has become the mainstream and hot spot of current development. [0003] CN103703077A discloses a biodegradable polyester film comprising: i) 80 to 95% by weight of biodegradable polyester based on aliphatic and aromatic dicarboxylic acids and based on aliphatic dihydroxy compounds, based on component i Based on the total weight of components i to ii; ii) 5 to 20% by weight of polyhydroxyalkanoates, based on the total weight of components i to ii; iii) 10 to 25% by weight of calcium carbonate, based on components i to vi iv) 3 to 15% by weight of talc, based on the total weight of components i to vi; v) 0 to 30% by weight of polylactic acid and / o...

AI Technical Summary

Problems solved by technology

[0009] It can be seen that the degradability of the polyester composition has been pursued all the time. At present, it is relatively easy to control the degradability above 90%, but there is still a large room for improvement in the pursuit of mechanical properties

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