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丁基防水嵌縫膠的紫外老化分析
- 發(fā)布時間 : 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.
丁基防水嵌縫膠的紫外老化分析
(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.
- 發(fā)布時間 : 2025-1-24 18:38:47
- Views:
Information
可知低溫循環(huán)交變老化過程中，拉伸剪切強(qiáng)度先略有下升720I，后降至2.0V11，左右并趨于穩(wěn)定，比初始值下降了約14070-960 h后，破壞類型山“內(nèi)聚破壞”變?yōu)椤按蟛糠謨?nèi)聚破壞，小部分針合金面赫附破壞”,1440h后鋁合金而剩附破壞進(jìn)一步增大在高低溫循環(huán)交變老化試驗前期，破壞類型保持為內(nèi)聚破壞，造成拉仲剪一切強(qiáng)度下降的原因主要是丁基防水嵌縫膠膠層內(nèi)聚強(qiáng)度的下降。在高低溫潮濕交變老化試驗后期，破壞類型逐漸轉(zhuǎn)變?yōu)殇X合金而孫附破壞，這說明界而私附強(qiáng)度發(fā)生了下降。當(dāng)界而赫附強(qiáng)度小于丁基防水嵌縫膠膠層內(nèi)聚強(qiáng)度時，就會發(fā)生內(nèi)聚破壞向豁附破壞的轉(zhuǎn)變界面瓤附強(qiáng)度下降主要有如下兩個原因:第一，丁基防水嵌縫膠膠層與鋁合金華材的熱膨脹系數(shù)不司，高低溫循環(huán)交變附界而處發(fā)生周期吐應(yīng)力變化，進(jìn)而詳致界面勁附破壞;第二，在高溫高濕環(huán)境下，水汽分子和附著在粘接接頭表的凝結(jié)水會逐漸滲透至丁基防水嵌縫膠膠層和鋁合金基材的粘接界面處，水對鋁合金造成腐蝕，導(dǎo)致粘接界面發(fā)生解吸附在上述兩個原因的共同作用下，界面赫附強(qiáng)度快速下降，進(jìn)而導(dǎo)致出現(xiàn)kG附破壞。
丁基防水嵌縫膠經(jīng)紫外老化后，拉伸性能和拉伸剪切強(qiáng)度測試結(jié)果分別如圖3和圖4所示可知:紫外老化過程中，拉伸強(qiáng)度逐步下降，斷裂伸長率變化不大，2 000 h時，拉仲強(qiáng)度降至2.87 MPa，比初始值下降了約260。在紫外老化試驗箱中，拉伸樣品同時受到紫外光、高溫和高濕三個老化因素的作用。波長340 nm的紫外光的光子能量約為352 kJ/mol，而丁基防水嵌縫膠大分子鏈中存在的C-N鍵鍵能約為305 kJ/rnol, C-C鍵鍵能約為332 kJ/mol,C-0鍵鍵能約為326 kJ>l。紫外光照射可造成丁基防水嵌縫膠表面大分子出現(xiàn)斷鏈降解，進(jìn)而導(dǎo)致拉伸強(qiáng)度下。高溫和高濕兩個老化因素對拉性能的影響與高低溫循環(huán)交變試驗中類似。在上述三個因素的共同作用下，拉伸強(qiáng)度并未出現(xiàn)先升后降，而是逐步下降，這說明紫外光照射是不者之中的主要老化因素。http://hbxqtax.com/
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