单组分聚氨酚丁基防水嵌缝胶粘接

发布时间 : 2026-8-21 16:05:49
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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.

单组分聚氨酚丁基防水嵌缝胶粘接

(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 : 2026-8-21 16:05:49
Views:

与胶条剥离试样相同环境下采用相同表面处理工艺制作3组对比拉伸剪切试样，以期将不同表面处理下粘接性能定量表征。结果如图6所示，可见N4试样断裂强度最低，为1.0MPa,NS和N6试样拉剪力相当，分别约为1.7MPa和1.8MPa。作为密封部位，单组分聚氨酚丁基防水嵌缝胶粘接允许拉伸剪切强度值为不小于1.5MPa，可见，仅清洁处理(N4)试样粘接强度不满足要求，而表面活化+底涂处理的(NS)试样粘接强度满足设计要求。考虑到在实际施工时清洁+打磨对于场景适应性会差一些，因此刷活化+底涂的方式可以同时提高粘接性和具备工程适应性。此外，N4拉剪断裂宏观形貌如图7所示，接头破坏形式为界面开裂，而NS,N6试样均为丁基防水嵌缝胶内聚破坏。选取N4和N6试样起裂区典型断口SEM观察可见，N4试样断面光滑平整，N6试样断口微观形貌为蜂窝状，大量丁基防水嵌缝胶填充料外露，剪切面沿填充料侧边撕裂，这种断裂形式对粘接接头的抗断裂性能的提升具有重要影响。

本试验选用的蒸馏水和甲酞胺所对应的表面能参数如表3所示。表4为检测液体在测试表面的接触角及通过Owens和Wendt法计算的表面能参数，见公式(1)。式中:e为接触角;y为液体表面能总量;y九为固体表面的色散分量;洲为液体表面能色散分量;yn为固体表面能极性分量;yn为液体表面能极性分量。

可见，表面施加活化剂+底涂剂后，试样表面表面能略微提升，但提升幅度有限，因此认为施加活化剂+底涂剂后不锈钢与聚氨酚密封胶之间的粘接性提升与试样表面的表面能关联有限。从微观界面层的角度来分析粘接时丁基防水嵌缝胶与基材的关系，粘接时基材与丁基防水嵌缝胶的界面示意图如图9(a)所示，基材微观界面较粗糙，丁基防水嵌缝胶与基材在微观层面存在较多点接触，导致孔穴等缺陷在粘接完成后残留在粘接界面，在后续老化试验中，由于丁基防水嵌缝胶与粘接金属的两相线膨胀系数相差太大，胶层容易产生内应力，在湿热条件下，孔穴发生膨胀降低粘接性能。当在基材表面施加活化剂+底涂后，活化剂+底涂可以更好地填充浸润基材表面，使粘接界面微观层面更加平滑，丁基防水嵌缝胶与基材呈现更多的面接触，有利于提升粘接性，如图9(b)所示。图10为未处理试样(N4)和施加活化剂+底涂试样(NS)表面的AFM三维图，可见，施加活化剂+底涂后试样的Sz(Z轴方向表面粗糙度)由187nm降低到53nm，这也验证了上述粘接微观界面在施加活化剂+底涂后表面更加平滑的理论。此外，活化剂+底涂剂中的活性基团会分别与基材和聚氨酚丁基防水嵌缝胶发生物理相互作用，从而提升粘接效果。http://www.sdyuantai.com/

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