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              硅烷改性聚氨酯密封膠材料的特性

              • 發布時間 : 2023-11-24 12:31:36
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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膠材料的特性

              (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 : 2023-11-24 12:31:36
              • Views:
              Information

                     目前,與硅烷改性聚氨酯密封膠相關的標準很多,主要有ISO 11600《建筑結構一密封材料一分類及要求》、ASTM C920《彈性填縫硅烷改性聚氨酯密封膠標準規范》,GB/T 14683《硅酮建筑硅烷改性聚氨酯密封膠》,JC/T 8810混凝土建筑接縫用密封膠》,JC/T 882《幕墻玻璃接縫用硅烷改性聚氨酯密封膠))),JC/T 883《石材用建筑硅烷改性聚氨酯密封膠》,JC/T' 884《彩色涂層鋼板用建筑密封膠》,JC/T 885《建筑用防霉硅烷改性聚氨酯密封膠》,JC/T 485《建筑窗用彈性密封劑》.JC/T 976《道橋嵌縫用硅烷改性聚氨酯密封膠》等,各標準對接縫硅烷改性聚氨酯密封膠位移能力的檢測指標不盡相同,但主要是通過彈性恢復率、拉伸模量、定伸粘結性、熱壓一冷拉后的粘結性、浸水光照后的定伸粘結性等指標及與其相類似的指標進行表征。

                     硅烷改性聚氨酯密封膠是以聚二甲基硅氧烷為主要原料,輔以交聯劑、填料、增塑劑、偶聯劑、催化劑在真空狀態下混合而成的膏狀物,在室溫下通過與空氣中的水發生反應固化形成彈性硅橡膠。

                     硅烷改性聚氨酯密封膠的高分子主鏈主要由硅一氧一硅鍵組成,在固化過程中交聯劑與基礎聚合物反應形成網狀的Si-O-Si骨架結構,其鍵能為106Kca1/mol,而通常的高分子材料的C-0和C-C鍵能均較小,分別為80和85.2 Kcal/mol。與其他高分子組成的有機密封膠(如:硅烷改性聚氨酯密封膠、丙烯酸類硅烷改性聚氨酯密封膠、聚硫硅烷改性聚氨酯密封膠等)相比,最顯著的特點就是優異的耐高低溫性能和耐候性能。另外,Si-O-Si鍵鍵能很高,不僅遠大于其它高聚物鍵能(其他化學鍵鍵能都低于300nm紫外線鍵能),而且Si-O-Si鍵能高于紫外線鍵能,這就是硅烷改性聚氨酯密封膠在紫外線照射下仍保持良好性能,而其他有機高聚物材料容易老化的根本原因。www.caffertyclinic.com

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