硅烷改性聚氨酯密封胶材料的特性

发布时间 : 2023-11-24 12:31:36
Views:

(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.

发布时间 : 2023-11-24 12:31:36
Views:

目前，与硅烷改性聚氨酯密封胶相关的标准很多，主要有ISO 11600《建筑结构一密封材料一分类及要求》、ASTM C920《弹性填缝硅烷改性聚氨酯密封胶标准规范》,GB/T 14683《硅酮建筑硅烷改性聚氨酯密封胶》,JC/T 8810混凝土建筑接缝用密封胶》,JC/T 882《幕墙玻璃接缝用硅烷改性聚氨酯密封胶))),JC/T 883《石材用建筑硅烷改性聚氨酯密封胶》,JC/T' 884《彩色涂层钢板用建筑密封胶》,JC/T 885《建筑用防霉硅烷改性聚氨酯密封胶》,JC/T 485《建筑窗用弹性密封剂》.JC/T 976《道桥嵌缝用硅烷改性聚氨酯密封胶》等，各标准对接缝硅烷改性聚氨酯密封胶位移能力的检测指标不尽相同，但主要是通过弹性恢复率、拉伸模量、定伸粘结性、热压一冷拉后的粘结性、浸水光照后的定伸粘结性等指标及与其相类似的指标进行表征。

硅烷改性聚氨酯密封胶是以聚二甲基硅氧烷为主要原料，辅以交联剂、填料、增塑剂、偶联剂、催化剂在真空状态下混合而成的膏状物，在室温下通过与空气中的水发生反应固化形成弹性硅橡胶。

硅烷改性聚氨酯密封胶的高分子主链主要由硅一氧一硅键组成，在固化过程中交联剂与基础聚合物反应形成网状的Si-O-Si骨架结构，其键能为106Kca1/mol，而通常的高分子材料的C-0和C-C键能均较小，分别为80和85.2 Kcal/mol。与其他高分子组成的有机密封胶(如:硅烷改性聚氨酯密封胶、丙烯酸类硅烷改性聚氨酯密封胶、聚硫硅烷改性聚氨酯密封胶等)相比，最显著的特点就是优异的耐高低温性能和耐候性能。另外，Si-O-Si键键能很高，不仅远大于其它高聚物键能(其他化学键键能都低于300nm紫外线键能)，而且Si-O-Si键能高于紫外线键能，这就是硅烷改性聚氨酯密封胶在紫外线照射下仍保持良好性能，而其他有机高聚物材料容易老化的根本原因。www.sdyuantai.com

Scan the QR code to read on your phone

上一篇: 具有高温陶瓷化功能的防火聚氨酯密封胶

下一篇: 丁基防水嵌缝密封胶分级及其选择

上一篇: 具有高温陶瓷化功能的防火聚氨酯密封胶

下一篇: 丁基防水嵌缝密封胶分级及其选择