High-strength shape-memory 3D (three dimensional) printing bioplastics and preparation method

Abstract

The invention discloses high-strength shape-memory 3D (three dimensional) printing bioplastics. The high-strength shape-memory 3D printing bioplastics are prepared by compounding PLLA (Poly-L-lactic acid), PCL and CaCO3, wherein the PLLA accounts for 25 to 80 percent of the total mass of the material. The PCL accounts for 17 to 72 percent of the total mass of the material, the CaCO3 accounts for 3 percent of the total mass of the material, the high-strength shape-memory 3D printing bioplastics are prepared by virtue of fused deposition molding; the PLLA and the PCL are blended, so that the mechanical strength of the PCL is improved, good biocompatibility is ensured; by virtue of machining or radiation cross-linking treatment, the PLLA has the shape memory characteristics; after the PLLA is blended and extruded with the PCL, the shape memory property of the material can also be maintained; by adding little CaCO3, not only can a capacity increasing effect be achieved and the performance degradation caused by the mixing be avoided, the mechanical strength of the material can be further improved; and moreover, the invention also discloses a preparation method of the high-strength shape-memory 3D printing bioplastics. The method is easy in operation, low in technological conditions and low in requirement on production equipment, capable of being widely popularized, and wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of 3D printing materials, in particular to a high-strength shape memory 3D printing bioplastic. Background technique [0002] 3D printing technology is called rapid prototyping technology, also known as additive manufacturing technology. It is based on digital model files and uses powdered metal, plastic and other bondable materials to construct objects by layer-by-layer printing. Rapid Prototyping Technology. Compared with traditional manufacturing technology, 3D printing does not need to make molds in advance, remove a large amount of material during the manufacturing process, and get the final product without going through complicated forging processes. Therefore, structural optimization, material saving and save energy. [0003] 3D printing materials are an important material basis for the development of 3D printing technology. To a certain extent, the development of materials determines whether 3D pri...

AI Technical Summary

Problems solved by technology

[0003] 3D printing materials are an important material basis for the development of 3D printing technology. To a certain extent, the development of materials determines whether 3D printing technology can have a wider application space. At present, biomaterials used in fused deposition (FDM) 3D printing technology The mechanical strength is poor, and the products printed by traditional 3D printing biomaterials lack shape memory function and cannot achieve variable shaping, which affects simulation and flexibility in medical applications, and does not have shape memory, which limits its Application range and practicality in the medical industry

[0004] Traditional 3D printing biomaterials are mainly PLA filaments, but PLA has poor impact strength, and printed products are easily damaged and do not have shape memory. In recent years, PCL-based printing filaments have also come out, but their tensile strength and bending The strength cannot meet the application requirements of the medical industry