Branched chain type degradable hydrophilic polyester master batch and preparation method thereof

Abstract

The invention provides a branched chain type degradable hydrophilic polyester master batch and a preparation method thereof. A degradable lactic acid group with a multi-branched chain structure and polyalcohol with a polyhydroxyl structure are introduced into a chain segment, excellent biodegradability and hygroscopicity are given to polyester, the degradability of polyester is further improved, a static contact angle of the surface of a copolyester chip is less than 60 degrees, and intrinsic viscosity is 0.45-0.52dL/g. The invention also provides a preparation method of branched chain type degradable hydrophilic polyester. The preparation method comprises the steps that reaction is carried out on benzenetetracarboxylic anhydride and lactic acid for preparing a branched chain monomer, then primary esterification reaction is carried out on the branched chain monomer, terephthalic acid and ethylene glycol, and then polyalcohol is added in a secondary prepolycondensation process for carrying out copolycondensation, and final polycondensation is carried out for preparing the branched chain type degradable hydrophilic polyester. The prepared polyester has the advantages of good hydrophility, fast biodegradation and the like and can be widely applied to the fields of home textiles, clothing, plastics and the like.

Description

【Technical field】 [0001] The invention relates to a branched degradable hydrophilic polyester masterbatch and a preparation method thereof, specifically introducing a branched and degradable lactic acid group and a polyol group with a polyhydroxy structure on the main chain of the polyester, While endowing the polyester with degradability, reduce the regularity of the polyester structure and introduce polar groups to achieve the purpose of improving the excellent biodegradability and hygroscopicity of the polyester, so that the prepared polyester has excellent degradability and hygroscopic properties, belonging to the field of polyester multifunctional modification. 【Background technique】 [0002] Polyester is a polymer compound with a certain molecular weight obtained by condensation polymerization of terephthalic acid and ethylene glycol. Because polyester has excellent properties such as high strength, high modulus, good shape retention, and high dimensional stability, it...

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Problems solved by technology

[0003] At present, the research on biodegradable polyester is mainly prepared by blending renewable natural polymer materials such as starch, cellulose, lignin, chitin, and plant fiber with polyester, but the thermal and mechanical properties of the prepared product are poor. , forming and processing is difficult, and cannot meet the performance requirements of engineering materials. It needs to be modified or blended with other polymer materials to form polymer alloys to obtain biodegradable materials with practical value.

The other is to add synthetic degradable polymers such as polylactic acid and polycaprolactone to the polyester system for blending to prepare polyester materials with certain degradable properties. Lactone is easy to be thermally degraded, anti-degradation agent needs to be added in the blending, and the addition amount is large, and it has a great impact on the mechanical properties of the product

The third is to use degradable monomers or polymers to copolymerize with polyester to prepare degradable polyester materials, but generally speaking, the mechanical strength is insufficient, the thermal stability is poor, and the product price is high, which makes it widely used in many application fields. limit

The patented biodegradable monomolecular multi-arm polymer and its preparation method and application (201310102420.6) announced a multi-arm polyester copolymer, but the prepared copolymer branched type has low viscosity, high fluidity, However, there are still polylactic acid segments with long chain structure, and the mechanical properties and heat resistance are poor.

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