Peroxide Vulcanisation of EPDM

Peroxide vulcanisation of EPDM is growing in popularity because of enhanced ageing resistance. A comparison of sulfur and peroxide cure systems for EPDM is shown in Table 32 (381). 

Apart from peroxide type and the amount of peroxide incorporated in compounds, the efficiency of crosslinking depends on coagents. The commercially important ones are  

Excellent ozone and weathering resistance, good heat and chemical resistance, good low temperature flexibility and outstanding electric properties, make 

EPDM rubber preferred for a great number of specific applications. For many years peroxide-cured EPDM based compounds have been applied, e.g., for window seals, automotive hoses, steam hoses, conveyer belts, roof sheeting, tank lining, roll coverings, mouldings, and last but not least, for electrical insulation and jacketing compounds. Two formulation types (403) are illustrated in Tables 33 and 34. 

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Sartomer s Saret zinc diacrylate and zinc dimethacrylate coagents were evaluated in the peroxide vulcanisation of EPDM automotive belt and hose compounds. Cure characteristics and effects on mechanical properties, heat and water resistance and adhesion of EPDM to metal and synthetic fibre reinforcements and to other mbbers were investigated. The results of this study and other experiments with Saret coagents in rabber formulations are discussed. 6 refs. 

Saret acrylic and methacrylic acid salts (Sartomer) were compared withtriallyl cyanurate as co-curing agents in the peroxide vulcanisation of EPDM compounds for a number... 

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