Recycled PP/PLA composite material, preparation method and application thereof

Abstract

The invention discloses a recycled PP / PLA composite material, a preparation method and application thereof. The composite material comprises the following components by weight: 50-75 parts of recycled PP resin; 5-25 parts of PLA resin; 2-5 parts of a toughening agent; 2-5 parts of PBAT resin; 1-5 parts of a compatilizer; 5-25 parts of glass fiber; and 5-15 parts of calcium carbonate; wherein the weight-average molecular weight of the PLA resin is 120,000 to 250,000; and the glass fiber is fed through a side feeding hole of an extruder. The notch impact strength is larger than or equal to 10KJ / m<2>, and the tensile strength is larger than 45MPa. The recycled PP / PLA composite material can be applied to preparation of automobile plastic and daily furniture products.

Description

technical field [0001] The invention relates to the field of plastic modification, more specifically, to a recycled PP / PLA composite material and its preparation method and application. Background technique [0002] Recycled polypropylene (PP) mainly has large performance differences. The overall performance of recycled PP is not as good as that of virgin PP. Although the impact performance of copolymerized recycled PP is higher than that of homopolymerized recycled PP, the overall performance is still poor. Polylactic acid (PLA) has excellent biodegradability, biocompatibility, and good mechanical properties, but its brittleness hinders the wide application of PLA. [0003] Blending recycled PP with PLA can enhance the tensile strength and flexural strength of recycled PP on the one hand. Due to its good degradability, PP / PLA composite materials can be recycled efficiently. On the other hand, after blending PLA and PP The performance is brittle, which leads to a further de...

AI Technical Summary

Problems solved by technology

[0003] Blending recycled PP with PLA can enhance the tensile strength and flexural strength of recycled PP on the one hand. Due to its good degradability, PP / PLA composites can be recycled efficiently. On the other hand, after blending PLA and PP The performance is brittle, which leads to a further decline in the impact performance of recycled PP

[0004] In the prior art, the Chinese patent (CN108864570A) discloses a new type of environmentally friendly wood-plastic wallboard and its preparation method, which mainly uses polylactic acid, recycled PP, maleic anhydride grafted polypropylene, and glass fiber and other components blended Obtain wood-plastic wallboard, although added maleic anhydride grafted polypropylene in the system, improved its impact performance slightly, but because a large amount of fillers have been added in the system, for example, superfine diatomite, nano-titanium dioxide, light carbonic acid Calcium and glass fibers, 40% of the total weight, greatly affect other properties

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