New Flame Retardant Systems Based on Expanded Graphite for Rigid Polyurethane Foams

Applied Sciences

Piotr Konca¹  Sylwia Członka²  Krzysztof Strzelec²  Anna Strąkowska² 

[1] Department of Building Physics and Building Materials, Lodz University of Technology, Politechniki 6, 90-924 Lodz, Poland;Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Stefanowskiego 12/16, 90-924 Lodz, Poland;

关键词: RPUF;    expanded graphite;    ionic liquids;    flame retardants;    thermal stability;    porous material;   

DOI  :  10.3390/app10175817

来源: DOAJ

【 摘 要 】

The effect of the addition of new flame retardant systems on the properties of rigid polyurethane (RPUF) foams, in particular, reduction in flammability, was investigated. The modification included the introduction of a flame retardant system containing five parts by weight of expanded graphite (EG) (based on the total weight of polyol), one part by weight of pyrogenic silica (SiO₂) and an ionic liquid (IL): 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim] [BF₄]), in an amount of 3:1 with respect to the weight of added silica. The kinetics of the synthesis of modified foams—including the growth rate and the maximum temperature—were determined and the physicochemical properties, such as the determination of apparent density and structure by optical microscopy, mechanical properties such as impact strength, compressive strength and, three-point bending test were determined. An important aspect was also to examine the thermal properties such as thermal stability or flammability. It has been shown that for rigid polyurethane foams, the addition of expanded graphite in the presence of silica and ionic liquid has a great influence on the general use properties. All composites were characterized by reduced flammability as well as better mechanical properties, which may contribute to a wider use of rigid polyurethane foams as construction materials.

【 授权许可】

Unknown