硅烷改性聚氨酯密封胶在高温下的耐久性

发布时间 : 2025-1-22 15:46:56
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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在高温下的耐久性

(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 : 2025-1-22 15:46:56
Views:

从表可知，不同牌号硅烷改性聚氨酯密封胶在高温下的耐久性没有统一规律，造成以上差异的主要原因是配方差异所致。硅烷改性聚氨酯密封胶分子在高温环境中始终存在两个方向的变化，一个是未反应完的交联剂偶联剂与主链上轻基继续反应，交联度提高;另一个是分子链断裂。当交联度提高作用大于分子链断裂作用时，拉伸强度提高;反之，拉伸强度减小。几种硅烷改性聚氨酯密封胶之间配方设计不同，交联度不同，粘接能力也不同，导致了长期高温老化后的不同变化趋势。

结语

(1)在温度一30200℃内，随测试温度升高，拉伸粘接强度和伸长率以近似线性下降趋势变化;但每种硅烷改性聚氨酯密封胶降幅不同，所测6个牌号硅烷改性聚氨酯密封胶拉伸粘接强度降幅在(2.8%-4.3%)/10℃，伸长率降幅在(2%-4.5%)/10℃。

(2)同一温度长期耐久性因老化温度不同有不同结果，在温度90,120℃环境中老化1年，硅烷改性聚氨酯密封胶拉伸粘接强度变化率不超过20%，未出现粘接破坏现象，可认为在温度120℃环境中使用1年硅烷改性聚氨酯密封胶与玻璃和铝基材的粘接仍然可靠。在温度150℃老化8个月、温度180℃老化5个月时硅烷改性聚氨酯密封胶失去弹性，发生大面积粘接破坏现象，所以在温度超过150℃长期使用时，应考虑硅烷改性聚氨酯密封胶与玻璃的粘接性问题。

(3)同一温度长期耐久性因配方差异有不同结果，硅烷改性聚氨酯密封胶1#,2#,6#在发生粘接失效前拉伸强度大于初始值，硅烷改性聚氨酯密封胶3#在发生粘接失效前拉伸强度几乎都小于初始值。http://www.sdyuantai.com/

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