Polylactic acid-modified grammite composite material and preparation method thereof

Abstract

The invention relates to the composite material technical field which is recombined with polylactic acid and modified wollastonite, in particular to polylactic acid modification wollastonite composite material, the preparation process and the product. The composite material comprises polyactic acid resin, modified wollastonite, plasticizing agent, lubricating agent and compatibilizer according to raw materials. The preparation process comprises firstly fully mixing polyactic acid resin, modified wollastonite, plasticizing agent, compatibilizer and lubricating agent with required quantity through a high-speed heating stirring mixer, secondly evenly mixing in a low-speed cooling stirring mixer, finally directly squeezing polylactic acid modification wollastonite composite material which is obtained by a twin-screw extruder. The product is made from polylactic acid modification wollastonite composite material. The composite material and the product are obviously improved in the aspects of mechanical properties such as impact strength and tension strength and the like and heat resistance, compared with polylactic acid base material, which makes the polylactic acid modification wollastonite composite material and the product have extensive application fields, thereby expanding the application field of polyactic acid.

Description

technical field [0001] The invention relates to the technical field of composite materials composed of polylactic acid and modified wollastonite, and relates to a polylactic acid-modified wollastonite composite material, a preparation method and a product thereof. Background technique [0002] Polylactic acid (Polylactic acid) polymer material is a new type of absorbable polymer developed in the past 30 years. It has the characteristics of non-toxic, non-irritating and good biocompatibility. It can be degraded into lactic acid in the human body and is naturally metabolized. , no residue. Therefore, in the field of biomedicine, it is widely used as materials for tissue engineering, human organs, bionic intelligence, surgical sutures, and controlled release drugs. Although polylactic acid has many excellent properties, polylactic acid belongs to polyester, which is a hydrophobic substance, which reduces its biocompatibility; secondly, it is difficult to control the degradatio...

AI Technical Summary

Problems solved by technology

The combination of hydroxyapatite (HA) and polylactic acid can improve the mechanical properties and biocompatibility of polylactic acid, and improve the toughness of the material. The hydroxyapatite / polylactic acid composite material has good biocompatibility and bone conduction However, due to the weak interfacial bonding force between hydroxyapatite powder and polylactic acid as filler, the composite interface of this kind of composite material is first destroyed during application, which leads to the loss of mechanical strength of the composite material. too fast (Liu Fang, Jia Demin, Wang Yingjun

Research progress of polylactic acid and its composites in bone tissue engineering, Journal of Biomedical Engineering, 2001; 18(3): 448-450), so the mechanical strength of hydroxyapatite / polylactic acid composites is not ideal

Carbon nanotubes (carbon nanotubes, CNTs) are one-dimensional nanomaterials used for the reinforcement of polylactic acid to prepare polylactic acid / carbon nanotube composites, but their biocompatibility seems to have adverse effects (Zhang D H, Kandadai M A, Cech J, et al. J Phys ChemB, 2006, 110: 12910-12915)