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化學結構上的特點都使得MS密封膠具有良好的低溫柔性
- 發(fā)布時間 : 2025-1-18 19:21:02
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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.
化學結構上的特點都使得MS密封膠具有良好的低溫柔性
(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(fā)布時間 : 2025-1-18 19:21:02
- Views:
對于MS密封膠來說,在耐候性方面擁有明顯的優(yōu)勢,這主要是由其分子結構決定的。在常用的密封材料中,聚氨醋的主鏈為C-0鍵,C-C鍵和C-N鍵,其中C-C鍵的鍵能約為348kJ/mol;MS密封膠的主鏈化學鍵則為Si-0鍵(鍵能對比圖1所示),鍵能大約為445kJ/mol。而宇宙中輻射到地球表面的最強紫外線波段處于UVB,其波長典型值約為300nm。根據(jù)得知,其能量為399kJ/mol。
也就是說,照射到地球表面能量最高的紫外線不足以破壞MS密封膠的Si-0主鏈結構,保證了其良好的耐紫外生能。與之相反,該紫外線能量可以破壞聚氨醋的主鏈結構,導致其在使用一段時間過后,會出現(xiàn)不同程度的開裂,從而造成漏水,影響使用效果。
由于我國幅員遼闊,緯度跨度較大,從海南到黑龍江的溫差也較大。因此,預制建筑板片接縫用密封材料也要具備溫度適應性及低溫柔性。
對于MS密封膠來說,其分子結構上的Si-0鍵較長,且硅原子上的甲基間距比較大,因此可以自由的進行旋轉(zhuǎn)。此外,甲基上的氫原子在低溫下有很高的運動性,這種運動主要圍繞Si-C鍵旋轉(zhuǎn);而且氫原子占據(jù)的空間自由體積大,與臨近分子間距大,分子間作用力小。這些化學結構上的特點都使得MS密封膠具有良好的低溫柔性。http://www.m.n5224.cn/
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