| Effect of Vulcanization Systems on Properties of Millable Polyurethane Elastomer |
| Received:February 15, 2022 Revised:February 15, 2022 |
| DOI：10.12136/j.issn.1000-890X.2023.06.0416 |
| Key Words: MPU；vulcanization system；vulcanization characteristics；tensile property；crosslinking density；blooming |
| Author Name | Affiliation | E-mail | | ZHANG Jianhang* | Qingdao University of Science & Technology | fuzi0821@163.com | | SHI Zhongxing | Qingdao University of Science & Technology | | | LI Kanxu | Qingdao University of Science & Technology | | | ZHANG Jiqing | China Railway Design Group Co. ，Ltd | | | CUI Tao | China Railway Design Group Co. ，Ltd | | | WANG Dalin | China Railway Design Group Co. ，Ltd | | | LIU Jinchun | Qingdao University of Science & Technology | |
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| Abstract: |
| In this study，millable polyurethane（MPU） elastomer was synthesized by using polyether
polyol and diphenylmethane diisocyanate as monomers and α-allyl glycerol ether as the chain extender，and
the effects of sulfur vulcanization system and peroxide [dicumyl peroxide（DCP）] vulcanization system on
the properties of the MPU compounds were investigated. The results showed that，with the increase of the
amount of sulfur and DCP，the t90 of the MPU compounds were prolonged，and the t90 of the MPU compound
with sulfur vulcanization system was shorter than that of the MPU compound with DCP vulcanization
system. Furthermore，the tensile stresses at 100% elongation of the MPU vulcanizates increased with the
increase of the amounts of the sulfur and DCP，the tensile strengths first increased and then decreased，and
the elongations at break decreased. Compared with the MPU vulcanizate with DCP vulcanization system，
the MPU vulcanizate with sulfur vulcanization system had higher tensile strength and larger elongation at
break，and its comprehensive tensile properties were better. Moreover，the crosslinking density of the MPU
vulcanizate with DCP vulcanization system was much higher than that of the MPU vulcanizate with sulfur
vulcanization system. When the sulfur amount exceeded 1. 5 phr，a blooming phenomenon would appear on
the surface of the MPU vulcanizate. |
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