Phosphorus-nitrogen-based supramolecular rare earth complex as well as preparation method and application thereof

Abstract

The invention relates to a phosphorus-nitrogen-based supramolecular rare earth complex as well as a preparation method and application thereof in flame retardance, heat resistance and toughening modification of polycarbonate, and belongs to the technical field of organic synthesis, supramolecular assembly and high polymer material processing. The phosphorus-nitrogen-based supramolecular rare earthcomplex flame retardant prepared by taking cerium nitrate hydrate and phosphorus and nitrogen organic ligands (DPA) as raw materials has a stable supramolecular structure, has an adjustable two-dimensional lamellar morphology, and can play a role in flame retardance in a condensed gas phase at the same time. The phosphorus-nitrogen-based supramolecular rare earth complex is introduced into polycarbonate and can be well and uniformly dispersed in a polycarbonate matrix to modify the polycarbonate, so that the flame retardancy of the polycarbonate is enhanced, the thermal stability and toughness of the polycarbonate are improved; and the defect that in a traditional flame retardant strategy, the flame retardant property and other using properties are difficult to consider at the same time is overcome.

Description

technical field [0001] The invention belongs to the technical fields of polymer composite material processing, organic synthesis and supramolecular assembly, and specifically relates to a phosphorus-nitrogen-based supramolecular rare earth complex and its preparation method and application. Background technique [0002] Polycarbonate (PC) is a commercial engineering plastic, which has been widely used in construction, communication, lighting and daylighting due to its good dimensional stability, mechanical strength, thermal stability, high transparency, processing and ductility characteristics, etc. , electronics, vehicle engineering and many other fields. 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 flames 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 ...

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