Low-viscosity high-toughness biodegradable pc/pla alloy and preparation method thereof

Abstract

The invention discloses a preparation method for a PC / PLA alloy with low viscosity, high toughness and bio-degradation characteristic, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: respectively fusing and blending the PC and EVA (Ethylene Vinyl-Acetate Copolymer), reacting, extruding and slicing to obtain a PC-g-EVA grafted copolymer; fusing and blending the PLA and PCL (Polycaprolactone), reacting, extruding and slicing to obtain a PLA-Co-PCL grafted copolymer; fusing, blending and extruding the PC-g-EVA and the PLA-Co-PCL to obtain a PC / PLA alloy. Compared with the conventional PC / PLA alloy, the material prepared by the preparation method is low in viscosity and is easy to process; the prepared PC / PLA alloy is mainly applied to a three-dimensional printing material; the material contains a PC material, so compared with the traditional three-dimensional printing material PLA, the PC / PLA alloy material has high rigidity and a three-dimensional printing product is not easy to deform; besides, the alloy material contains the PLA and the PCL, is endowed with the biodegradation characteristic and has environment-friendly action.

Description

technical field [0001] The invention relates to a method in the technical field of polymer materials, in particular to a low-viscosity, high-toughness, biodegradable, hydrolysis-resistant and antistatic polycarbonate (PC) / polylactic acid (PLA) alloy and a preparation method thereof. Background technique [0002] Polycarbonate (PC) is an engineering plastic with excellent performance, which has good comprehensive performance, good impact toughness, good heat resistance, and excellent rigidity; polylactic acid (PLA) comes from renewable resources, mainly from starch and Sugars, formed by direct condensation of lactic acid or ring-opening polymerization of lactide, semi-crystalline PLA material has a lower glass transition temperature Tg and melting point Tm, making it the preferred material for 3D printing; at the same time, PLA is biodegradable , making the PC / PLA alloy also biodegradable and environmentally friendly. However, PLA materials used in 3D printing are usually br...

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Problems solved by technology

[0007] However, the defects of the above-mentioned prior art are: the toughness of the material is low, and the products produced are relatively brittle; at the same time, its biodegradation characteristics are not obvious, and it has no environmental protection effect, and it is difficult to meet the requirements for environmental protection in the case of large-scale mass production.

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