Physical aging-resistant polylactic acid two-dimensional material, its preparation method and application

Abstract

The invention discloses a two-dimensional polylactic acid material resistant to physical aging, a preparation method and application thereof. The polylactic acid two-dimensional material has a crystallinity of 35wt% to 85wt% and contains 15wt% to 65wt% of an amorphous phase. The amorphous phase contains 5wt% to 55wt% of a metastable phase. The characteristic peak in the figure appears at 918cm ‑1 place. The polylactic acid two-dimensional material has the characteristics of physical aging resistance, the change rate of tensile strength and bending strength before and after storage is small, the change of elongation at break is also small, and the degree of crystallinity and orientation are high. The resulting polylactic acid bone plate and other products not only have the strength equivalent to or better than the existing polylactic acid bone plate, but also have excellent physical aging resistance, which can maintain the stability of size and performance in the storage and logistics stage. At the same time, its The preparation process is simple, beneficial to large-scale production, and has broad application prospects.

Description

technical field [0001] The invention relates to a polylactic acid material, in particular to a physical aging-resistant polylactic acid two-dimensional material, its preparation method and application (bone plate or folder, etc.), and belongs to the technical field of polymer materials. Background technique [0002] With the increasing car ownership and the development of the production industry in the world, there are a large number of traumatic fractures caused by traffic accidents and production safety accidents every year; in addition, spinal degeneration, bone tumors, and bone tuberculosis caused by diseases Orthopedic defects or dysfunctions such as bone grafting make the demand for bone transplantation the largest transplant demand after blood transfusion. The basic principles of clinical orthopedic treatment are reduction, fixation, and early functional exercise, and fixation includes external fixation and internal fixation. Internal fixation usually refers to fixin...

AI Technical Summary

Problems solved by technology

[0005] Although the above known technologies can prepare polylactic acid bone plates, there are the following limitations: (1) under the current technical conditions, the polylactic acid embryo body obtained by injection molding is easy to undergo physical aging during the shelf life (warehousing and logistics stage), resulting in rapid changes. brittle; (2) solid-state extruded orientation-reinforced polylactic acid is also prone to physical aging in the storage and logistics stage, resulting in rapid brittleness; (3) pressure-formed general-purpose polylactic acid bone plates will also undergo physical aging in the storage and logistics stage. The bone plate becomes brittle rapidly; (4) The polylactic acid bone plate obtained by 3D printing does not have a highly oriented molecular chain structure, and the mechanical properties and physical aging resistance will be affected to a certain extent; (5) The polylactic acid coating without orientation induction The skirt is also prone to physical aging and becomes brittle rapidly; therefore, it is necessary to develop new polylactic acid materials and products resistant to physical aging, especially polylactic acid bone plates and other products, to meet the comprehensive requirements proposed by various applications. high performance requirements