Polycarbonate Resin Composition for Low-Heat, Low-Smoke Fire Protection

The patent employs a composite flame retardant system combining phosphorus-based flame retardant (1-30 parts by mass), nitrogen-based flame retardant (1-30 parts by mass), and metal hydroxide (10-80 parts by mass) with talc filler (20-100 parts by mass). This multi-component composite approach creates synergistic effects that simultaneously achieve flame retardancy, low heat release, and low smoke generation performance required by EN 45545-2 standards

The patent optimizes the specific parameters of each component: phosphorus content (1-30 parts), nitrogen content (1-30 parts), metal hydroxide content (10-80 parts), and talc content (20-100 parts). By precisely controlling these compositional parameters and their ratios, the invention achieves the required fire safety performance while maintaining mechanical properties

The patent selects flame retardant components that perform multiple functions simultaneously: phosphorus-based compounds provide flame retardancy and promote char formation; nitrogen-based compounds enhance fire resistance and reduce smoke; metal hydroxides contribute to flame inhibition and act as fillers; talc provides structural stability and fire protection. This multi-functionality reduces the need for separate additives for each function

The invention merges multiple flame retardant mechanisms (phosphorus, nitrogen, metal hydroxide) into a single integrated composition system that works synergistically. By combining these components in specific ratios and using talc as a common filler base, the patent simplifies the overall composition structure while maintaining effective fire protection