| Effects of Hot Air Aging on Properties of Welded Joint of Rubber Floor Covering |
| Received:August 05, 2021 Revised:August 05, 2021 |
| DOI：10.12136/j.issn.1000-890X.2022.11.0856 |
| Key Words: rubber floor covering；welded joint；weld；hot air aging；tensile strength；DSC；Raman spectroscopy |
| Author Name | Affiliation | E-mail | | SHEN Hefei* | CRRC Qingdao Sifang Co.，Ltd | 247088851@qq.com | | LI Gangqing | CRRC Qingdao Sifang Co.，Ltd | | | HAN Xiaohui | CRRC Qingdao Sifang Co.，Ltd | | | XU Zhibao | No. 52 Institute of China North Industries Group Yantai Branch Co.，Ltd | | | ZHAO Min | CRRC Qingdao Sifang Co.，Ltd | | | JIANG Daixun | CRRC Qingdao Sifang Co.，Ltd | | | ZHENG Ziqin | No. 52 Institute of China North Industries Group Yantai Branch Co.，Ltd | | | LIANG Jingheng | No. 52 Institute of China North Industries Group Yantai Branch Co.，Ltd | |
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| Abstract: |
| Abstract：The effects of hot air aging（70 ℃×14 d） on the properties of the welded joints of groups Ⅰ
and Ⅱ rubber floor coverings with different welding parameters were studied，and the differential scanning
calorimetry（DSC） and Raman spectroscopy analyses of the welded joint were carried out. The hot air aging
test showed that，the welded joint of group Ⅰ rubber floor coverings melted from weld position，and the
tensile strength of the welded joint of group Ⅱ rubber floor coverings decreased by 12%. The DSC analysis
showed that，the heat flow rate of the welded joint weld of group Ⅰ rubber floor coverings changed at 65. 6
℃，and there was an obvious endothermic peak at 67. 2 ℃，indicating that the weld had a viscous fluid state
transition. There was no obvious endothermic peak in the welded joint of group Ⅱ rubber floor coverings and
the base material of the welded joint of group Ⅰ rubber floor coverings in the temperature range of 25～110
℃ . Raman spectroscopy analysis showed that，after hot air aging，the characteristic peak intensities of the
welded joint of group Ⅰ rubber floor coverings at 1 056 and 1 118 cm-1 decreased significantly，which was
caused by the cross-linking and fracture reactions of the rubber molecular chains during hot air aging. |
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