A kind of pla/pbat composite material and preparation method thereof

Abstract

The invention belongs to the technical field of preparation of high molecular materials, and particularly relates to a PLA / PBAT composite material and a preparation method thereof. The material is prepared by compounding PLA, PBAT, EGMA and OMMT. OMMT and EGMA synergistically improve the strength and toughness of the material. In particular, by EGMA, poor adhesion of two phase interfaces is improved, a PLA-EGMA-PBAT continuous phase is formed, and external force acting on the continuous phase can be transmitted to a dispersed phase through the phase interface; dispersed phase particles deformafter being stressed, and force is transmitted to the continuous phase through an interface, so that the stress transmission efficiency is improved, and the toughness of the material is improved. Hydrogen bonds are formed between OMMT and PLA or PBAT, so that an effect of physical crosslinking points is achieved, and the strength of the material is further improved. According to the preparation method, the vibration force field of a balanced three-screw dynamic extruder is utilized to promote good dispersion of EGMA and OMMT in PLA and PBAT melts, the method is simple, and the prepared producthas both the high strength of PLA and the strong toughness of PBAT, and has wide application prospect in the fields of agricultural films, packaging products, beverage bottling, medical treatment andthe like.

Description

technical field [0001] The invention belongs to the technical field of preparation of polymer materials, and in particular relates to a PLA / PBAT composite material and a preparation method thereof. Background technique [0002] Due to the reduction of petroleum resources and the huge environmental pollution caused by petroleum-based plastics, fully biodegradable plastics have received large-scale attention. As a new type of environmentally friendly polymer material, polylactic acid (PLA) has good biocompatibility, degradability, and easy processability. It also has the advantages of high strength and modulus, and has a lower At present, it is widely regarded as one of the most promising renewable, green, and environmentally friendly materials, and has attracted the attention of researchers in the past two decades. [0003] Although PLA has the advantages of high strength and modulus, PLA still has many disadvantages, such as PLA has disadvantages such as poor toughness, slo...

AI Technical Summary

Problems solved by technology

[0005] The traditional PLA / PBAT composite processing method is mainly single-screw or twin-screw extrusion processing. The single-screw extruder relies on friction and shear force to achieve extrusion, which leads to certain limitations: the shear field Weaker, not conducive to the melting and dispersion of materials, the heat transfer performance of plastics is poor, the output is relatively low, the energy consumption is relatively high, and the quality of the product is not easy to control; and the twin-screw extruder also has the problem of low screw back pressure. Therefore, it is usually used to process materials with low density, and it is not suitable for processing transparent materials with high density such as PLA, etc.

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