Preparation method for polycaprolactone and levorotatory polylactic acid mixture

Abstract

The invention provides a preparation method for a polycaprolactone and levorotatory polylactic acid mixture, belonging to the field of preparation of materials. The preparation method comprises the following steps: putting PLLA into an electric heating drying box and drying; commixing PCL, PLLA and TBC in a double-screw-rod extruder, wherein the rotary speed of a screw rod is 200r / min; adding 8g of TBC into each 100g of PCL / PLLA commixture; and granulating and drying the obtained commixture, and fusing and pressing the commixture in a flat plate vulcanization instrument at 170 DEG C to obtain a thin sheet. The mixture is prepared by the improvement of a traditional process method; and the compatibility of the mixture is improved in a manner of adding tributyl citrate into the mixture, so that the material has a relatively good shape memory function. The preparation method for the polycaprolactone and levorotatory polylactic acid mixture has a simple process, is easy to operate and is suitable for popularization and application.

Description

technical field

[0001] The invention belongs to the field of material preparation, in particular to a method for preparing a blend of polycaprolactone and L-polylactic acid. Background technique

[0002] With the rapid development of material technology and the advancement of medical technology, more and more new materials are used as repair materials in modern medicine. Polycaprolactone (PCL) is made of ε-caprolactone through ring opening A new type of polymer polymerized has many potential applications in biomedical engineering and other fields due to its excellent biodegradability, biocompatibility and processability. However, due to the low melting point of PCL, only about 60°C, the thermal deformation resistance is poor, and when it is used as a repair material, orthopedic fixation material and tissue engineering scaffold material in medicine, its hardness and strength cannot meet the requirements, so it is necessary Modification of PCL. Contents of the invention ...