MS密封胶粘接允许拉伸剪切强度

发布时间 : 2024-12-5 9:23:32
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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.

MS密封胶粘接允许拉伸剪切强度

(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 : 2024-12-5 9:23:32
Views:

利用红外光谱研究了施加底涂前(N4)及施加活化剂+底涂后(NS)不锈钢粘接表面化学结构的变化，如图5所示。其中，1 457 cm,1 508 cm和1 606 cm处为苯环振动峰，1 181 cm和1 232cm处为C一0的非对称伸缩振动峰，915 cm,1 036cm处为环氧振动峰，2 930 cm处为C一H伸缩振动吸收峰，由于原始不锈钢表面未见谱峰，因此NS试样红外光谱中的振动吸收峰为活化剂及底涂剂的特征峰。由于环氧键是三角形结构，键与键之间存在巨大的张力，因此环氧键具有高活性，这可能是施加底涂后提升材料粘接性的一个重要原因。此外，活化剂是一种含有能促进茹性的活性物质的醇溶液，与单组分MS密封胶搭配使用，可以有效清洁和活化金属等非孔性被粘基材，提高粘接性能。活化剂和底涂剂中所包含的柔性和润湿促进作用的有机基团，可提升MS密封胶在不锈钢基材表面的润湿力和吸附力，避免不锈钢表面或表面微孔因所吸附的空气和水分而形成弱边界层，从而有效改善了胶接件的耐湿热性能。

拉伸剪切性能

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. 0 MPa , NS和N6试样拉剪力相当，分别约为1.7 MP。和1. 8 MPa。作为密封部位，单组分MS密封胶粘接允许拉伸剪切强度值为不小于1. 5 MPa，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MS密封胶内聚破坏。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MS密封胶填充料外露，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。http://www.sdyuantai.com/

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下一篇: 单组分聚氨酯密封胶胶在环境影响下老化性能的六类检测