Process for manufacturing flame-retardant rubber materials without the use of halogen-containing additives and materials produced by this process

Abstract

The useful solution refers to a process for manufacturing flame-retardant rubber materials with high mechanical properties based on a blend of EPDM and BR rubber with halogen-free flame retardants, a small amount of EPDM-g-MA compatibilizer, and DO-EG expanded graphite flame retardant. By using a reverse mixing method in the blending stage, EPDM is combined with inorganic additives to create component 1, and cross-mixing with component 2 is used to create flame-retardant rubber material with high mechanical properties based on an EPDM / BR (80 / 20) blend with halogen-free additives. The resulting flame-retardant rubber material showed a balanced combination of high mechanical properties and superior flame retardancy, with a tensile strength of 20.5 MPa, elongation at break of 212%, hardness of 73 Shore A, critical oxygen index (LOI) of 30.7%, and flame resistance level V0 according to UL94 standard.