Method for preparing aromatic-aliphatic copolyester

Abstract

The invention relates to a method for preparing aromatic-aliphatic copolyester. In the method, aromatic binary acid, dihydric alcohol and aliphatic hydroxy acid are used as a copolymerization system to prepare the aromatic-aliphatic copolyester by direct melt polycondensation under the action of a catalyst, wherein the dihydric alcohol is one or both of aliphatic dihydric alcohol and cyclized aliphatic dihydric alcohol. The method overcomes the defect of the generation of poisonous methanol in the prior ester exchange process. By the random copolymerization, a polylactic acid chain segment can be introduced to an aromatic polyester chain segment, and the sequence length of an aromatic component is reduced, thereby improving the degradation property of the copolyester and keeping better mechanical behavior; moreover, the method also has the advantages of simple synthesis process, easy reaction operation and low-priced and easily obtained materials, and the obtained copolyester has certain degradation property.

Description

technical field [0001] The invention relates to a method for preparing aromatic-aliphatic copolyester, in particular to a method for preparing degradable aromatic-aliphatic copolyester. Background technique [0002] With the development of the economy and the continuous improvement of people's living standards, plastics, especially disposable plastic packaging materials, daily necessities and mulch waste, are increasingly polluting the environment. On the other hand, the dwindling petroleum resources also pose a corresponding threat to the sustainable development of the global plastics industry, and plastic materials derived from petroleum resources have penetrated into various fields of the national economy. The technological progress of various sectors of the national economy and the people's Life is inseparable from plastic materials, so how to reduce dependence on petroleum resources is the key to the sustainable development of the plastics industry and even the global e...

AI Technical Summary

Problems solved by technology

From the descriptions of these patents, it can be learned that the synthesis process for obtaining aromatic-aliphatic copolyesters is mainly divided into two types: one is to use aromatic dibasic acid methyl ester as a reaction monomer and aliphatic dibasic acid And dibasic alcohol carries out co-condensation reaction to obtain copolyester product, and this process will release toxic methanol molecules during operation, which is easy to cause pollution to the environment, and is not an environmentally friendly synthetic process method; the other is to directly synthesize aromatic polyester Copolyester products are obtained by reactive blending with aliphatic polyesters. Although the process is simple to operate, the resulting products are often block copolymers, and the aromatic segments still exist in the molecular chain in the form of longer segments. In the same way as ordinary aromatic polyester, this part of the segment still has the disadvantage of being difficult to degrade

Therefore, both methods have certain limitations

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