Study on the synergistic effect of red phosphorus and magnesium hydroxide in polypropylene flame retardant system

Research objectives

The flame retardancy enhancement effect of the combination of red phosphorus and magnesium hydroxide on polypropylene was investigated and compared with the effect of a single additive. The synergistic mechanism of the two flame retardants during thermal degradation and combustion was elucidated to achieve more efficient heat absorption, gas phase inhibition, and char formation.

Preparation of samples: Prepare PP samples containing different proportions of RP and MH through processes such as twin-screw extrusion and injection molding. Thermal analysis: Use TGA and DSC technology to evaluate the thermal stability and heat release characteristics of PP composite materials. Flame retardant test: The flame retardant performance of composite materials is measured through UL-94 vertical burning test and LOI test, and parameters such as heat release rate are evaluated using a cone calorimeter. Charcoal layer and morphology analysis: Use SEM and TEM to conduct microstructure analysis of the burned charcoal layer to understand the role of RP and MH in the formation of the charcoal layer. Mechanical property testing: Evaluate the tensile strength, flexural strength and impact properties of PP after adding flame retardants to ensure that the mechanical properties of the material are not affected. Expected results

Synergistic effect verification: It is expected that the combination of RP and MH will produce a stronger flame retardant effect than either additive alone, benefiting from their complementarity in flame retardant mechanisms. Optimal addition ratio: The research aims to find the optimal ratio and addition amount of RP and MH to achieve optimal flame retardant effect and mechanical properties. Improved thermal stability: It is expected that the synergistic effect of RP and MH will improve the thermal stability of PP, delay the thermal degradation process, and reduce heat release. environmental impact considerations

The study will also assess the potential environmental impact of using RP and MH, two environmentally friendly non-halogen flame retardants, which are generally considered to be more ecologically sound. This research is dedicated to developing safer PP materials that require high flame retardant properties in key application areas such as construction, transportation and electronic components. By combining the advantages of red phosphorus and magnesium hydroxide, the flame retardant effect of PP is enhanced.