A kind of phosphorus-nitrogen-based supramolecular rare earth complex and its preparation method and application

Abstract

The invention relates to a phosphorus-nitrogen-based supramolecular rare earth complex and its preparation method and its application in polycarbonate flame retardancy, heat resistance and toughening modification, belonging to organic synthesis, supramolecular assembly and polymer material processing technology field. The phosphorus-nitrogen-based supramolecular rare earth complex flame retardant prepared by using cerium nitrate hydrate and phosphorus and nitrogen organic ligands (DPA) as raw materials has a stable supramolecular structure and an adjustable two-dimensional lamellar morphology and can play a flame-retardant role in the condensed phase-gas phase at the same time. The phosphorus-nitrogen-based supramolecular rare earth complex is introduced into polycarbonate, which can be well and uniformly dispersed in the polycarbonate matrix, and the polycarbonate is modified to enhance the flame retardancy of polycarbonate while also improving Its thermal stability and toughness overcome the defect that it is difficult to balance the flame retardant performance and other performance in the traditional flame retardant strategy.

Description

A kind of phosphorus-nitrogen-based supramolecular rare earth complex and its preparation method and application technical field The invention belongs to the processing, organic synthesis, supramolecular assembly technical field of polymer composite material, be specifically related to a A phosphorus-nitrogen-based supramolecular rare earth complex and its preparation method and application. Background technique Polycarbonate (polycarbonate, PC) is a kind of commercial engineering plastics, due to its good dimensional stability properties, mechanical strength, thermal stability, high transparency, processing ductility, etc., have been widely used in construction, communications, lighting Optical, electronic and electrical, vehicle engineering and many other fields. However, due to the abundant hydrocarbon and benzene ring structures in its molecular chain, PC has Higher flammability. Once PC products are exposed to open flame or sustained high temperature, it is pr...

AI Technical Summary

Problems solved by technology

However, due to the rich hydrocarbon and benzene ring structure in its molecular chain, PC has high flammability

Once PC products are exposed to open flame or continuous high temperature, they are prone to violent combustion or thermal oxidation cracking, which will generate a large amount of heat radiation and release toxic and suffocating thick black smoke, which will not only cause the failure of the material, but also cause a fire and cause more damage. losses and casualties

Although the traditional PC flame retardant material has good flame retardant effect, the thermal stability and mechanical properties of the material are greatly reduced

[0003] As a strategic resource, rare earth metals are dubbed "industrial vitamins". Due to their variable valence, they have certain functions of capturing free radicals, anti-oxidation and catalyzing carbonization reactions. In recent years, they have gradually begun to be used in flame retardancy. , initially, rare earth oxides were directly used in polyolefins and ethylene-propylene rubbers with relatively stable chemical properties, which had a good effect on improving the limiting oxygen index (LOI) and vertical combustion rating of materials, but in polyesters, polyesters, etc. Polymers such as carbonates and polyamides are seldom used. This is because when rare earth oxides are melt-blended with them, ester bonds, carbonate bonds, amide bonds, etc. will be broken, resulting in severe degradation of the matrix and material failure. Therefore, There is a need to introduce rare earth metals into polymers in more stable forms

Images