Properties and microstructure of expandable graphite particles pulverized with an ultra-high-speed mixer

Influence of Organoclay on the Flame Retardancy and Thermal Insulation Property of Expandable Graphite/Polyurethane Foam

The rigid polyurethane foams (RPUFs) filled with organoclay cloisite 20A and expandable graphite (EG) were prepared by the one-step expanding foam method. Flame behavior, mechanical properties, and thermal conductivity of the composites were investigated. The vertical burning test (UL-94V) and limiting oxygen index (LOI) showed that the flame retardancy was increased proportionally with the content of EG in PU composite. However, the presence of EG filler impaired the thermal insulation and the compressive strength of the composite. In this report, we proved that organoclay could improve the compressive strength, thermal insulation, and flame retardancy of EG/polyurethane composites. This work can contribute to the development of environment-friendly flame-retardant products for green growth.

An Investigation on Reactivity, Mechanical and Fire Properties of Pu Flexible Foam

Regarding the increasing demands for the fire resistance polyurethane foam for train and airplane industry and a serious planning to phase out the halogenated flame retardants (FR) because of high and toxic smoke generation, the use of halogen-free fire retardants have been more investigated in recent years. In this work, we have concentrated more on two well-known solid halogen-free fire retardants, expandable graphite, and melamine with two grades of each one and compare their performance in a variety of areas including reactivity, physical and mechanical properties, and fire behaviors and finally the tendency of each FR to have a synergetic effect with each other. The obtained results show that the addition of these two FR affect significantly on reactivity and physical—mechanical properties such as recession factor, expansion factor and compression load deflection (CLD P25/5), sag factor, compression set, tear strength, resilience, and more efficiently on fire behavior of flexible polyurethanes foam.