观察聚氨酯密封胶试样表面是否发生了变化

发布时间 : 2024-1-2 12:34:02
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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.

观察聚氨酯密封胶试样表面是否发生了变化

(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 : 2024-1-2 12:34:02
Views:

四组聚氨酯密封胶试样经过上述处理后，首先观察聚氨酯密封胶试样表面是否发生了变化?首先用白色纱布擦拭聚氨酯密封胶试样，看是否有物质析出?结果发现标准条件环境下以及浸水条件下[水温(40士5)℃,(23士2℃],擦拭聚氨酯密封胶试样表面均无物质析出(图丘图6)，而经过水一紫外辐照后的聚氨酯密封胶试样表面有物质析出(图7)。

分析:标准条件下的聚氨酯密封胶试样拉伸强度为0.46MPa，粘结破坏面积为0，主要是由于刷在混凝土表面的底涂使混凝土中的碱性物质无法析出，增强了混凝土与聚氨酯密封胶的界面粘结力。

1和2相比，可以发现浸水条件(23士2)℃下，其拉伸强度由0.46MPa变为0.16MPa，下降65 %，下降明显;最大强度时伸长率由279.66%变为230.71 %，下降18%，稍有下降;粘结破坏面积由0变为100%。主要是由于混凝土为多孔结构，浸水条件下其水分会渗透到混凝土内部，刷在混凝土表面的底涂逐渐遭到破坏，混凝土本身的碱性物质会析出，破环其与装配式聚氨酯密封胶的粘结面，从而使其拉伸强度下降明显，最大强度时伸长率稍有下降，粘结破坏面积增大。2和3相比，可以发现随着浸水温度的升高，其拉伸强度由0.16MPa变为O.15MPa，下降6%;最大强度时伸长率由230.71%变为186.96%，下降19%0说明在较高的温度(40士5)℃下，水分子活动能力增强，刷在混凝土表面的底涂进一步的遭到破坏，力学性能稍有下降。3和4相比，其拉伸强度没有变化，最大强度时伸长率下降5%，可以发现在水一紫外辐照处理168h条件下，紫外线只是使其表面发生了老化，而未使其内部结构发生变化，故其力学性能下降不明显。http://www.sdyuantai.com/

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