| 不同潮湿环境下装配式建筑用聚氨酯密封胶的粘结性能研究 |
| Study on Adhensive Properties of PU Sealant for Prefabricated Buildings in Different Humidity Environments |
| 投稿时间：2023-06-09 修订日期：2023-06-13 |
| DOI：10.12136/j.issn.1000-890X.2025.04.0290 |
| 中文关键词: 装配式建筑 聚氨酯密封胶 粘结性能 潮湿环境 |
| 英文关键词: prefabricated building PU adhensive property humidity condition |
| 基金项目:河北省重点研发计划项目（21475702D） |
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| 中文摘要: |
| 研究不同潮湿环境下装配式建筑用聚氨酯密封胶的粘结性能。结果表明：低湿环境下粗糙基体与聚氨酯密封胶的粘结强度小于光滑基体，高湿环境下光滑基体与聚氨酯密封胶的粘结强度小于粗糙基体；低温潮湿环境使聚氨酯密封胶的粘结强度减小，低温干燥环境对聚氨酯密封胶的粘结性能影响较小；随着混凝土含水量的增大，聚氨酯密封胶的拉伸强度减小；在干燥养护＋浸水养护时，随着干燥养护时间的延长，聚氨酯密封胶的粘结强度先增大后减小；在异氰酸酯指数为0.95时，聚氨酯密封胶的拉伸性能较好；当触变剂用量为30份时，聚氨酯密封胶的粘结性能较好。 |
| 英文摘要: |
| The adhensive properties of polyurethane（PU） sealant for prefabricated buildings in different humidity conditions were studied.The results showed that the adhensive strength between rough matrix and PU sealant was lower than that of smooth matrix in low humidity condition，and the adhensive strength between smooth matrix and PU sealant was lower than that of rough matrix in high humidity condition.The low temperature and humidity condition reduced the adhensive strength of PU sealant，while the low temperature and dry condition had little effect on the adhensive properties of PU sealant.As the moisture content of concrete increasing，the tensile strength of PU sealant decreased.During dry curing and immersion curing，as the drying curing time prolonging，the adhensive strength of PU sealant first increased and then decreased.When the isocyanate index was 0.95，the tensile properties of PU sealant were better.When the amount of thixotropic agent was 30 phr，the adhensive properties of PU sealant were better. |
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