| 轨道车辆用硅酮密封胶的黄变行为研究 |
| Research on Yellowing Behavior of Silicone Sealant Used in Railway Vehicles |
| 投稿时间：2022-12-11 修订日期：2022-12-11 |
| DOI：10.12136/j.issn.1000-890X.2024.10.0723 |
| 中文关键词: 黄变行为 硅酮密封胶 橡胶基材 粘接 |
| 英文关键词: yellowing silicone sealant rubber substrate adhesion |
| 基金项目: |
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| 中文摘要: |
| 研究轨道车辆用硅酮密封胶与橡胶基材粘接时产生的黄变行为。结果表明：在空气、高温（80 ℃）和紫外光环境下静置5 d，挤涂在橡胶基材A上的硅酮密封胶发生不同程度的黄变，挤涂在铝合金基材和橡胶基材B上的硅酮密封胶未发生黄变；黄变前后硅酮密封胶1#和2#的傅里叶红外光谱特征峰和元素相对含量均无明显变化，即硅酮密封胶的黄变不是其自身分子结构改变导致的；硅酮密封胶与橡胶基材A粘接时发生黄变行为主要是由于橡胶基材A中的小分子物质迁移至硅酮密封胶导致的；含有苯环和羧基等不饱和键基团的邻苯二甲酸酯类增塑剂以及胺类物质二丁基胺在紫外光环境下易发生分子结构变化，进而导致硅酮密封胶黄变。 |
| 英文摘要: |
| The yellowing behavior of the silicone sealant used in rail vehicles when bonded to the rubber substrate was studied.The results showed that，standing for 5 d in air，high temperature（80 ℃） and
ultraviolet light enviroments，the silicone sealant extruded onto the rubber substrate A occured varying degrees of yellowing，and the silicone sealant extruded onto the aluminum alloy substrate and rubber substrate B did not occure yellowing.There was no significant change in the characteristic peaks of Fourier transforom infrared spectra and relative elemental contents of the silicone sealant 1# and 2# before and after yellowing，thus the yellowing of the silicone sealant was not caused by change in its own molecular structure.The yellowing behavior of the silicone sealant during bonding with the rubber substrate A was mainly caused by the migration of small molecular substances in the rubber substrate A to the silicone sealant.Phthalate plasticizers containing unsaturated bond groups such as benzene rings and carboxyl groups，as well as amine substances such as dibutylamine，were prone to molecular structural change under UV light enviroments，thereby promoting yellowing of the silicone sealant. |
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