Bio-based biodegradable multi-block copolymer as well as preparation method and application thereof

Abstract

The invention discloses bio-based biodegradable multi-block copolymer as well as a preparation method and application thereof. The multi-block copolymer comprises a chain segment A and a chain segmentB; the chain segment A is fat-aromatic coplyester with number average molecular weight of 3000 to 100000, which is obtained by performing esterification (ester exchange) on C2-C36 fatty diacid and derivatives thereof, C6-C20 aromatic diacid and derivatives thereof, C2-C36 divalent alcohol, and 0.0 to 10% by weight of polyhydroxyl or polycarboxyl compound and performing condensation polymerization; the chain segment B is fatty copolyester with number average molecular weight of 3000 to 100000, which is obtained by performing esterification (ester exchange) on dimer acid and derivatives thereof, C2-C12 fatty diacid and derivatives thereof, C2-C36 divalent alcohol as well as 0.0 to 10% of polyhydroxyl or polycarboxyl compound and performing condensation polymerization. The chain segment A and the chain segment B react with a polyfunctional chain extender of polyisocyanate, a polyepoxy compound and carbodiimide which is 0.01 to 10% of the polymer to form the multi-block copolymer. The product prepared by the method has high biodegradability, mechanical property and processing property, and can be widely applied to the fields of packaging, biological medicine, medical treatment and thelike.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a bio-based biodegradable multi-block copolymer and its production 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, ABS, polystyrene, polyester, etc. The appearance of these materials has greatly facilitated people's lives , but also because these materials cannot be degraded in the environment for a long time after they are discarded, which brings about the problem of "white pollution" and destroys the ecological environment of the earth. In addition, these materials are derived from fossil resources such as petroleum, coal, and natural gas, and these fossil resources are non-renewable. [0003] In order to solve the environmental pollution and resource regeneration problems caused by plastic products, mate...

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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, ABS, polystyrene, polyester, etc. The appearance of these materials has greatly facilitated people's lives , but also because these materials cannot be degraded in the environment for a long time after being discarded, which brings about the problem of "white pollution" and destroys the ecological environment of the earth

[0009] The inventors of the present invention found in the research on dimer acid-modified biodegradable polyester that by adopting the technical scheme disclosed in Chinese patent application CN201510591116.1, when the content of dimer acid is relatively high, the melting point of the obtained material is very low, and the The tensile strength is very low, and the elongation at break is also relatively small, so it cannot be used as a flexible packaging material; using the technical solution published in Chinese patent application CN201610598663.7, when the dimer acid content is relatively high, the obtained material, or the tensile strength is very small or poorly biodegradable or even non-degradable

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