Synergistic flame retardant effect of magnesium hydroxide in polypropylene composites

In the vast field of materials science, magnesium hydroxide (Mg(OH)_2) has become a hot research topic due to its excellent flame retardant properties. Especially in the preparation of magnesium hydroxide/expandable graphite/polypropylene (Mg(OH)_2/EG/PP) composite materials, the addition of magnesium hydroxide significantly improves the thermal stability and flame retardant properties of the material.

Thermal degradation process analysis

In the early stages of thermal degradation, polypropylene begins to decompose, releasing volatile small molecules. As the temperature continues to rise, magnesium hydroxide begins to decompose, releasing water vapor and generating magnesium oxide. This endothermic reaction helps slow down the degradation rate of the material.

The decomposition of magnesium hydroxide not only absorbs heat and reduces the temperature of the combustion area, but also releases water vapor which helps dilute oxygen, thereby inhibiting the combustion process.

When the temperature rises further, the expandable graphite expands rapidly to form a porous carbon layer, which physically isolates oxygen and reduces heat transfer, effectively improving the flame retardant properties of the material. Synergistic flame retardant effect of combustion behavior

The combination of magnesium hydroxide and expandable graphite creates a highly effective flame retardant system. The formation of the carbon layer and the endothermic decomposition of Mg(OH)_2 work together to significantly improve the flame retardant effect of the composite material. Effective control of heat release rate

The reduction of the total heat release rate (THR) and peak heat release rate (PHRR) of the Mg(OH)_2/EG/PP composite material proves its fire control ability in fire and reduces fire hazards. The optimization of thermal degradation and combustion behavior of magnesium hydroxide/expandable graphite/polypropylene composites benefits from the efficient flame retardant effect of magnesium hydroxide and the physical protection effect of expandable graphite. This composite material not only improves the flame retardant properties of polypropylene, but also reduces the emission of smoke and toxic gases, enhancing the environmental protection performance of the material. It has broad application prospects in construction, transportation, electronic and electrical equipment manufacturing and other fields, and meets the high standards of safety and environmental protection in modern society.