| 超高层建筑用有机硅密封胶的制备及其拉伸粘接性能的研究 |
| Preparation of Silicone Sealants for Super High-rise Building and Its Tensile Bonding Properties |
| 投稿时间：2023-06-09 修订日期：2023-06-13 |
| DOI：10.12136/j.issn.1000-890X.2023.11.0862 |
| 中文关键词: 超高层建筑 有机硅密封胶 拉伸粘接性能 密封效果 |
| 英文关键词: super high-rise building silicone sealant tensile bonding property sealing effect |
| 基金项目:河北省重点研发计划项目（21475702D） |
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| 中文摘要: |
| 采用α，ω-二羟基聚二甲基硅氧烷和气相法白炭黑为主要原料，制备交联剂（甲基三甲氧基硅烷与甲醇反应合成）质量分数分别为2%，4%和6%的超高层建筑用有机硅密封胶，并对其拉伸粘接性能进行研究。结果表明：3种不同交联剂质量分数的有机硅密封胶的理化性能达到指标要求；在盐雾老化试验中，随着老化时间的延长，添加4%交联剂的有机硅密封胶的拉伸粘接强度及其保持率始终保持较高水平，且粘接破坏面积率几乎为0；在紫外光照老化试验中，随着紫外光照时间的延长，添加4%交联剂的有机硅密封胶的拉伸剪切强度和转矩降幅相对较小；在热老化试验中，随着热老化时间的延长，添加4%交联剂的有机硅密封胶的粘度变化相对较小，且热老化温度较高（80 ℃）时撕裂强度也未大幅降低。因此，添加4%交联剂的有机硅密封胶的拉伸粘接性能较好，密封效果最佳。 |
| 英文摘要: |
| Using α，ω-dihydroxypolydimethylsiloxane and fumed silica as the main raw materials，silicone sealants for super high-rise buildings were prepared with mass fractions of 2%，4% and 6% of cross-linking agent（synthesized by the reaction of methyltrimethoxysilane and methanol），and their tensile bonding properties were studied.The results showed that the physical and chemical properties of the three silicone sealants with different cross-linking agent mass fractions met the index requirements.In the salt mist aging test，as the aging time increased，the tensile bonding strength and its retention rate of silicone sealant adding 4% cross-linking agent always remained at a high level，and the bonding damage area was almost 0.In the UV light aging test，as the UV light exposure time increased，the decreases of the tensile shear strength and torque of silicone sealant adding 4% cross-linking agent were relatively small.In the heat aging test，as the heat aging time increased，the viscosity of silicone sealant with 4% cross-linking agent changed relatively little，and the tear strength did not decrease significantly when the heat aging temperature was high（80 ℃）.Therefore，the silicone sealant adding 4% cross-linking agent had better tensile bonding properties and the best sealing effect. |
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