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- 發布時間 : 2023-9-8 9:28:46
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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.
中模量硅烷改性聚氨酯密封膠具有更優的形變能力
(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.
- 發布時間 : 2023-9-8 9:28:46
- Views:
Information
如圖1所示，高模量和中模量硅烷改性聚氨酯密封膠在承受相同應力作用情況下，中模量硅烷改性聚氨酯密封膠具有更優的形變能力。
對于因玻璃重力等造成的靜態應力，一般首選高模量和高強度的硅烷改性聚氨酯密封膠。但由于組裝不同熱膨脹系數的固體材料時(如組裝玻璃與塑料或玻璃與金屬)，無法避免因溫度變化造成的硅烷改性聚氨酯密封膠延伸。如，連接1.5 m玻璃到PVC窗框的2 mm厚的硅烷改性聚氨酯密封膠，當溫度從20℃升到70℃時，會延伸50%。而給定延伸率條件下，與中等模量硅烷改性聚氨酯密封膠相比，高模量硅烷改性聚氨酯密封膠與兩個交界面的應力要大得多(圖1)，較大的應力會使裝配過早失效，這種失效在遭遇高濕度、高溫和強風等外部因素時會更為嚴重。要實現對這些熱應力的長期耐受，低模量但彈性和彈性回復能力出色的硅烷改性聚氨酯密封膠通常是最佳選擇。
綜合考慮上述應力，具有出色彈性回復能力和耐候性的中模量硅烷改性聚氨酯密封膠是建筑物保持長期耐久性的最優選擇。
與傳統硅烷改性聚氨酯密封膠相比，硅烷改性聚氨酯密封膠以Si-。為主鏈結構，其鍵能(445 kJ/mol)與傳統硅烷改性聚氨酯密封膠主鏈C-C鍵鍵能(358 kJ/mol)相比要更高。因此，硅烷改性聚氨酯密封膠耐UV(圖2)和耐熱性更好。硅烷改性聚氨酯密封膠在極低溫度條件(-55℃)下仍能保持彈性，且模量隨溫度變化而發生的變化很小(圖3)，因此，在高溫和低溫環境下都可以使用。因其模量中等，受到的日常熱膨脹有關的應力也有限。www.www.lustload.com
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