硅烷改性聚氨酯密封胶发生失效的根本原因

发布时间 : 2023-2-25 19:22:02
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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发生失效的根本原因

(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 : 2023-2-25 19:22:02
Views:

综上所述，硅烷改性聚氨酯密封胶发生失效的根本原因有以下两点:(1)不能在200 ℃下长期运行。200 ℃ , 115 h发生粉化，且失重为1.44%入容易发生腐蚀失重较多，说明该硅烷改性聚氨酯密封胶长期高温下容易粉化，TG-DSC曲线表明200 ℃存在缝隙，酸性物质渗硅烷改性聚氨酯密封胶与金属基材在腐蚀性介质中的界面结合力较弱。腐蚀试验后，发生附着破坏，拆卸实验后的形貌可以看出有大部分基体裸露，硅烷改性聚氨酯密封胶对金属基体起不到保护作用。

由于之前某厂TRT装置上采用的白色密封材料的防腐效果较好，拆卸后韧性较高，且硅烷改性聚氨酯密封胶内部未被工况环境中的腐蚀介质浸入。结合原硅烷改性聚氨酯密封胶的失效分析和朱育元[}6z」的TRT透平机的修复一文中的相关资料，本试验拟选用环氧类作为极树型叶根桦槽的硅烷改性聚氨酯密封胶。结合上一章原用硅烷改性聚氨酯密封胶的失效分析结果以及TRT服役环境对硅烷改性聚氨酯密封胶的操作有以下要求:固化方式及固化时间。由于硅烷改性聚氨酯密封胶涂抹的面非平面，而且面积较大不适合高温固化，所以产品必须要能够用人工涂敷的方法涂抹于桦槽和叶根处，且满足常温固化。由于在室温操作时，硅烷改性聚氨酯密封胶同时在慢慢固化中，根据操作时间，需要满足实际施工需求的表干时间(可操作时间)在半个小时左右，固化时间大于4小时且小于24小时，为了让设备尽快投入使用，为企业创造效益。www.sdyuantai.com

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