运用过程丁基防水嵌缝胶失效情况

发布时间 : 2026-2-13 23:37:53
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.

运用过程丁基防水嵌缝胶失效情况

(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 : 2026-2-13 23:37:53
Views:

虽然在设计校核时，会根据车辆使用工况，综合静态、动态、环境载荷对粘接接头的影响进行粘接接头的设计，但在实际运用一段时间后，部分线路头罩外侧丁基防水嵌缝胶仍出现不同程度的龟裂、粉化、软化等失效现象。从产品结构来看，粘接接头结构如图1所示，胶层实际有两部分组成，胶1+胶2，两种胶的技术参数如表2所示，两种胶的模量有明显差异，其中胶2的E模量为2.6MPa，胶1的E模量为3.4MPa，实际承载时，模量较低的胶2优先承载结构应力。胶2的极限接头尺寸截面为10mmx8mm/10mmx14mm，而胶1的极限接头尺寸截面为40mmx8mm/40mmx14mm。两较:7.1MPax10mmx8mm<3.4MPax40mmx8mm，两者剪切承载能力比较:4.5MPax10mmxL<1.7MPax40mmxL，胶2在此结构中其拉伸、剪切的承载能力是弱于胶1的。设计计算是按照胶1优先承载进行的，因此其计算结果只能说明结构是可靠的，即完全不考虑胶2承载能力情况下，结构也不会发生安全风险。但是，根据上述计算，因为胶2优先承载，其承载能力不足，因而胶2非常容易发生失效。制造工艺影响从制造工艺来看，因为玻璃钢头罩大多是在模具上采用不饱和聚酚浸润玻纤成型，脱模后存在较大的收缩、变形，目前这种制成品的变形是不可逆的。在实际装配过程中，为了保障头罩与车体装配效果，通常对变形处使用工装夹具进行矫正安装困，也就是说安装过程中存在明显的内应力。制作模拟样件，按照实际粘接结构的胶层宽度、厚度进行样件粘接，丁基防水嵌缝胶固化后利用固定工装将样件两端拉伸4mm，即设置预变形量为4mm(见图4)，经老化(湿热、UV,盐雾)后，测试结果如表3。结果表明4mm形变对接头强度无明显影响。http://www.sdyuantai.com/

Scan the QR code to read on your phone

上一篇: MS密封胶1粘接方案的粘接接头是否安全

下一篇: 硅烷改性聚氨酯密封胶层龟裂软化问题

上一篇: MS密封胶1粘接方案的粘接接头是否安全

下一篇: 硅烷改性聚氨酯密封胶层龟裂软化问题