Medical degradable composite material

Abstract

The invention relates to a medical degradable composite material, which consists of polylactic acid (PLA), toughening agent, inorganic nano composite material and antioxidant, wherein in the composition, each 100 portions of PLA by weight contain 20 to 50 portions of the toughening agent, 0.5 to 3 portions of the inorganic nano composite material, and 0.1 to 0.5 portion of the antioxidant. The toughening agent is thermoplastic polyurethane (TPU) or styrene type thermoplastic elastomer (SEBS or SBS). The inorganic nano composite material is silver-supported nano silicon dioxide or silver-supported nano titanium dioxide. The composite material is prepared by adopting a method of melting and blending, and has the advantages of reasonable formulation, stable performance, good toughness and good heat resistance; an injection molded product is easy to demould; small molecular plasticizing agent does not need to be added during processing; compounds are prevented from separating, polluting liquid medicine and entering human body; and the composite material is applicable to producing disposable injectors, can automatically degrade, and reduces the problem of white pollution of disposable medical products.

Description

technical field [0001] The invention relates to a polymer material, in particular to a blended modified polylactic acid medical degradable composite material. The composite material can improve the toughness and heat resistance of polylactic acid, and improve its processing performance, and it is specially used for making disposable degradable syringes. Background technique [0002] We know that from the birth of the first synthetic plastic in 1907 to now various types of plastics have entered every corner of people's lives and become a part of human society, the plastics industry has gone through a century of ups and downs. However, today, 100 years later, when we enjoy the convenience and comfort brought by plastics, we also have to face various problems caused by it, the first of which is environmental pollution - the chemical composition of traditional plastics is stable, and it is difficult to degrade and disappear . In response to this problem, various countries have...

AI Technical Summary

Problems solved by technology

Mainly: ①Material properties: Although the mechanical properties of PLA are similar to those of PS, it is brittle and has poor impact resistance.

②Processability: PLA has poor thermal stability, and the molecular weight will drop significantly when processed below the melting temperature or thermal decomposition temperature

The existing polylactic acid raw materials have limited their application in disposable medical devices due to their poor toughness and poor heat resistance. For example, syringe products are fragile at room temperature and low temperature, and ethylene oxide sterilized syringes are deformed at 50-60°C