Recycled ethylene-propylene-diene monomer

BR, butyl rubber CB, carbon black CBS, cyclohexyl-2-benzothiazolefulfenamide CNT, carbon nanotube CSPE, chlorosulfonate polyethylene CIP, carbonyl-iron powder EPM, ethylene propylene monomer EPDM, ethylene propylene diene monomer EVA, ethylene-vinyl acetate FSR, fluorosilane rubber GRP, graphite powder HGM, hollow glass microsphere lONP, iron oxide nanoparticle LDH, layered double hydroxide MBT, 2-mercaptobenzothiazol MMT, modified montmorillonite NR, natural rubber PAMAM, polyamidoamine R-EPDM, recycled ethylene propylene diene monomer SR, silicon rubber SBR, styrene-butadiene rubber TBBS, iV-tert-butyl-2-benzothiazolesulfenamide. 

H. Nabil, H. Ismail, A.R. Azura, Optimisatioii of accelerators and vulcanising systems on thermal stability of natural rubber/recycled ethylene—propylene-diene-monomer blends. Materials Design, ISSN 0261-3069 53 (January 2014) 651-661. http //dx.doi. org/10.1016/jjnatdes.2013.06.078. 

HIPS have been proposed for upgrading of recycled HDPE. In a study, artificially aged HDPE samples were melt blended with HIPS, thereby using an ethylene propylene diene monomer/SBR (49). 

Automotive industry waste provided another idea for a study [10]. Recycled plastics from bumpers are being applied in several areas, even as new bumpers [11, 12]. Thermal analysis was applied to the material used in discarded car bumpers, which came from standard grade automobiles of different brands. The recycled polymer composition was a polymeric blend of PP, ethylene-propylene-diene monomer (EPDM) and high-density polyethylene (HOPE). Differential scanning calorimetry (DSC) analysis (Figure 2.5) confirmed the presence of PP, and indicated HDPE and EPDM as ingredients in the formulation of car bumpers. 

In one study, rPP and recycled polyethylene (rPE) were blended with two compatibilisers, polyethylene-grafted-maleic anhydride (PE-g-MA) and ethylene propylene diene monomer (EPDM) copolymer, and OMMT [56]. Scanning electron microscopy (SEM) micrographs showed that the blend with EPDM exhibited a better compatibilisation than PE-g-MA. The presence of OMMT caused an increase of the storage modulus and loss modulus additionally, OMMT improved the thermal stability. 

Another illustration of the impact of these influences, such as increasing landfill taxes for general rubber goods products, is that more forms of waste rubber are being considered for recycling. One example of this is the recycling of post-industrial and postconsumer ethylene-propylene-diene monomer (EPDM) rubber membranes, which has received a great deal of attention in recent years as described in an article published in Rubber and Plastics News [5]. 

The reactivity of ethylene is high, whereas that of propylene is low and the various dienes have different polymerisation reactivities. The viscous mbber solution contains some unpolymerised ethylene, propylene, unpolymerised diene, and about 10% EPDM, all in homogeneous solution. This solution is passed continuously into a flash tank, where reduced pressure causes most of the unpolymerised monomers to escape as gases, which are collected and recycled. 

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