Biodegradable fat-aromatic copolyester with low carboxyl content and multi-branched chain structure, and preparation method and application thereof

Abstract

The embodiment of the invention provides a biodegradable fat-aromatic copolyester with low carboxyl content and a multi-branched-chain structure, and a preparation method and an application thereof, and relates to the technical field of high polymer materials. Polymeric monomers comprise: at least one selected from C2-C36 aliphatic dibasic acids and derivatives thereof; at least one selected fromC6-C20 aromatic diacids and derivatives thereof, and heterocyclic diacids and derivatives thereof; at least one selected from C2-C20 diols; at least one selected from polyols, polybasic organic acidsand derivatives thereof; and at least one selected from organic single acids with a boiling point of not less than 200 DEG C under normal pressure. The biodegradable fat-aromatic copolyester is prepared by mixing the polymerization monomers and then carrying out esterification or ester exchange and condensation polymerization reactions, the carboxyl content of the copolymer is less than or equal to 15 mmol / kg, and the weight-average molecular weight is greater than or equal to 100,000; and the production cost is low, and the product has good biodegradability, aging resistance, excellent mechanical properties and processability and can be used for preparing various biodegradable products.

Description

technical field [0001] The present application relates to the technical field of polymer materials, in particular to a biodegradable aliphatic-aromatic copolyester with low carboxyl content and multi-branched structure, its preparation method and application. Background technique [0002] Since the 20th century, humans have synthesized a variety of polymer synthetic materials, such as polyethylene, polypropylene, polyvinyl chloride, styrene resin (ABS), polystyrene, polyester, etc. The emergence of these materials has greatly It is convenient for people's life, but also because these materials cannot be degraded in the environment for a long time after they are discarded, it brings the problem of "white pollution" and destroys the ecological environment of the earth. [0003] There are ester bonds in the main molecular chain of polyester polymer materials, which are similar to ester bonds widely present in nature (such as fats, oils, etc.), and are considered to be an import...

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Problems solved by technology

[0002] Since the 20th century, humans have synthesized a variety of polymer synthetic materials, such as polyethylene, polypropylene, polyvinyl chloride, styrene resin (ABS), polystyrene, polyester, etc. The emergence of these materials has greatly It is convenient for people's life, but also because these materials cannot be degraded in the environment for a long time after they are discarded, it brings the problem of "white pollution" and destroys the ecological environment of the earth

[0006] Relative to the main raw materials of aliphatic-aromatic copolyesters, dibasic acids and dibasic alcohols, both carbodiimide compounds and glycidyl ether epoxy compounds are expensive auxiliary agents, so the above-mentioned preparation method increases Raw material cost, manufacturing cost, and complexity of preparation

In addition, the above method will also bring some side effects, such as residual additives, product yellowing, odor and other problems

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