| Effect of Second Ligand of Double Ligand Lanthanum Dithiocarbamate Accelerator on Properties of EPDM |
| Received:July 01, 2019 Revised:July 01, 2019 |
| DOI：10.12136/j.issn.1000-890X.2020.04.0276 |
| Key Words: rare earth accelerator；double ligands；EPDM；cross-link density；thermal oxidative aging resistance；multifunctional additive |
| Author Name | Affiliation | E-mail | | HU Tao | Beijing University of Chemical Technology | 15902238012@163.com | | WANG Guangke | Global Energy Internet Research Institute Co.Ltd | | | JIANG Guangming | China Academy of Building Research | | | WANG Yajing | Beijing University of Chemical Technology | | | WANG Ying | Beijing University of Chemical Technology | | | HU Shui* | Beijing University of Chemical Technology | hushui@mail.buct.edu.cn | | LIU Li | Beijing University of Chemical Technology | |
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| Abstract: |
| Compared with single ligand rare earth accelerator lanthanum diethyldithiocarbamate（LaDC），the effect of four kinds of rare earth accelerator [LaDC-diphenylguanidine （LaDC-D），LaDC-thiourea （LaDC-TU），LaDC-2-mercaptobenzimidazole（LaDC-MB），LaDC-2，6-ditertbutyl-4-methylphenol （LaDC-BHT）] with double ligands on the properties of ethylene-propylene-diene rubber（EPDM） was studied.The results showed that，compared with LaDC，LaDC-D had better vulcanization promoting activity due to the better synergistic activation of the two ligands，t90 of the corresponding compound was significantly shortened，and the crosslinking density of the vulcanizate increased. The vulcanizate with the rare earth accelerators having anti-aging second ligand，LaDC-MB and LaDC-BHT，exhibited better tear strength，cutting resistance and thermal oxidative aging resistance，and the one with LaDC-MB had the best thermal oxidative aging resistance．The double-ligand rare earth accelerator could not only effectively improve the vulcanization efficiency of the compound but also improve the thermal oxidative aging resistance of the vulcanizate，providing a new idea for the development of multifunctional rubber additives. |
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