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丁基防水嵌缝胶的紫外老化分析

  • 发布时间 : 2025-1-24 18:38:47
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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.

丁基防水嵌缝胶的紫外老化分析

(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 : 2025-1-24 18:38:47
  • Views:
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       可知低温循环交变老化过程中,拉伸剪切强度先略有下升720I,后降至2.0V11,左右并趋于稳定,比初始值下降了约14070-960 h后,破坏类型山“内聚破坏”变为“大部分内聚破坏,小部分针合金面赫附破坏”,1440h后铝合金而剩附破坏进一步增大在高低温循环交变老化试验前期,破坏类型保持为内聚破坏,造成拉仲剪一切强度下降的原因主要是丁基防水嵌缝胶胶层内聚强度的下降。在高低温潮湿交变老化试验后期,破坏类型逐渐转变为铝合金而孙附破坏,这说明界而私附强度发生了下降。当界而赫附强度小于丁基防水嵌缝胶胶层内聚强度时,就会发生内聚破坏向豁附破坏的转变界面瓤附强度下降主要有如下两个原因:第一,丁基防水嵌缝胶胶层与铝合金华材的热膨胀系数不司,高低温循环交变附界而处发生周期吐应力变化,进而详致界面劲附破坏;第二,在高温高湿环境下,水汽分子和附着在粘接接头表的凝结水会逐渐渗透至丁基防水嵌缝胶胶层和铝合金基材的粘接界面处,水对铝合金造成腐蚀,导致粘接界面发生解吸附在上述两个原因的共同作用下,界面赫附强度快速下降,进而导致出现kG附破坏。

       丁基防水嵌缝胶经紫外老化后,拉伸性能和拉伸剪切强度测试结果分别如图3和图4所示可知:紫外老化过程中,拉伸强度逐步下降,断裂伸长率变化不大,2 000 h时,拉仲强度降至2.87 MPa,比初始值下降了约260。在紫外老化试验箱中,拉伸样品同时受到紫外光、高温和高湿三个老化因素的作用。波长340 nm的紫外光的光子能量约为352 kJ/mol,而丁基防水嵌缝胶大分子链中存在的C-N键键能约为305 kJ/rnol, C-C键键能约为332 kJ/mol,C-0键键能约为326 kJ>l。紫外光照射可造成丁基防水嵌缝胶表面大分子出现断链降解,进而导致拉伸强度下。高温和高湿两个老化因素对拉性能的影响与高低温循环交变试验中类似。在上述三个因素的共同作用下,拉伸强度并未出现先升后降,而是逐步下降,这说明紫外光照射是不者之中的主要老化因素。http://www.sdyuantai.com/

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