硅烷改性聚氨酯密封胶相对粘结强度随老化时间变化

发布时间 : 2024-5-10 11:37:03
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(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

硅烷改性聚氨酯密封胶相对粘结强度随老化时间变化

(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.

发布时间 : 2024-5-10 11:37:03
Views:

如图7所示，从长期来看，相对硅烷改性聚氨酯密封胶粘结强度随老化时间延长呈线性下降的趋势，这与图2、图3中的结果基本一致。这表明，在整个紫外老化过程中，虽然交联与降解一直并存，但由于光、热以及水的共同作用，使得降解一直占据主导地位。相对粘结强度随老化时间的变化关系可按一次函数y=A+Bx进行拟合，详细参数列于表1。相对伸长率随老化时间延长，几乎不变，这与图4、图5中的结果也是基本一致的。

由表1可拟合得到硅烷改性聚氨酯密封胶相对粘结强度随老化时间变化的方程:

对任一既有建筑上使用的硅烷改性聚氨酯密封胶，其使用时间是已知的，通过测定其粘结强度，求出相对粘结强度，即可根据方程(1)推算硅烷改性聚氨酯密封胶自然老化结果相对应的实验室人工加速老化时间，及时掌握使用中的硅烷改性聚氨酯密封胶所处的老化阶段，从而推测幕墙工程的安全性、预测其剩余寿命。

通过人工加速老化试验，得到硅烷改性聚氨酯密封胶力学性能随老化时间变化的数据，并对其进行归一化处理，得到的曲线能在一定程度上反映多数硅烷改性聚氨酯密封胶力学性能随老化时间变化的趋势。

只要掌握足够多的硅烷改性聚氨酯密封胶老化试验数据，并对其进行归一化处理，就可以对方程(1)进行完善，得到对实际工程中使用的大部分硅烷改性聚氨酯密封胶都适用的相对粘结强度与老化时间关系方程，从而为工程检测中评估既有建筑硅烷改性聚氨酯密封胶的耐久性提供有效的技术支持。同时，通过这样的方法还能帮助研究人员建立起实验室人工加速老化的结果和自然老化结果的对应关系，为后人评估既有建筑胶耐久性提供宝贵的数据。http://www.sdyuantai.com/

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