| Preparation of Silicone Sealants for Super High-rise Building and Its Tensile Bonding Properties |
| Received:June 09, 2023 Revised:June 13, 2023 |
| DOI：10.12136/j.issn.1000-890X.2023.11.0862 |
| Key Words: super high-rise building；silicone sealant；tensile bonding property；sealing effect |
| Author Name | Affiliation | E-mail | | SUN Na | Guoneng Shuohuang Railway Development Co.，Ltd | dwew562333@163.com |
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| Abstract: |
| 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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