分析湿度对MS密封胶材料力学性能的影响

发布时间 : 2023-3-23 11:58:56
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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.

分析湿度对MS密封胶材料力学性能的影响

(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 : 2023-3-23 11:58:56
Views:

为了分析湿度对MS密封胶材料力学性能的影响，引入吸湿度(hygroscopic degree)的概念和计算方法。即MS密封胶试件吸湿后，去除MS密封胶试件表面水并通过称重计算MS密封胶试件的吸湿度。本试验以实验室的环境条件(298K的环境温度，40%的相对环境湿度)为基准。MS密封胶试件吸湿度的计算公式为:其中，HD一MS密封胶试件的吸湿度，m一MS密封胶试件吸湿前的质量，m:一MS密封胶试件吸湿后的质量，m2-m,一MS密封胶试件的吸湿量。为了分析材料的吸湿度与吸湿时间和吸湿温度的关系。分别在2,4, 6, 8,10, 24, 48h和吸湿温度为363K的水浴条件下，以及在293, 313, 333, 353373K和吸湿时间为6h的水浴条件下，进行吸湿试验。结果如图3.4所示。

从图3.4 (a)可知，MS密封胶试件在363K的吸湿温度中吸湿2h后，MS密封胶试件的吸湿度明显增大，增加了0.79%。随着MS密封胶试件吸湿时间的继续增大，MS密封胶试件的吸湿度也增大，但增加幅度小于最初的2h。当MS密封胶试件吸湿时间到lOh后，MS密封胶试件吸湿度的增大速度开始减小。MS密封胶试件吸湿时间到48h后，吸湿度达到2.89%。此时MS密封胶试件已达到吸湿饱和状态。可知，此密封胶在高温、高湿(363K, 100%)环境下，吸湿速度和吸湿度都随着吸湿时间的增加而增加， 48h后可达到吸湿饱和的状态，吸湿曲线呈现幂函数形式的变化。从图3.4(b)可知，在293K的吸湿温度下放置6h，MS密封胶试件的吸湿度不变，说明此密封胶在常温下耐水性好。随着吸湿温度的不断增加，MS密封胶试件吸湿度不断增大。当温度到达373K时，基本达到吸湿饱和状态。

对图3.4 (a)和图3.4 (b)可知，吸湿时间6h、吸湿温度373K的状态下，MS密封胶试件吸湿度为1.56%;吸湿时间8h、吸湿温度363K的状态下，MS密封胶试件吸湿度为1.98%。故在高温状态下，吸湿时间越长越易完成吸湿过程，吸湿温度对MS密封胶试件吸湿度的影响远小于吸湿时间。而吸湿时间6h、吸湿温度293K的状态下，MS密封胶试件吸湿度约为0.00%;吸湿时间为2h、吸湿温度为363K的状态下，MS密封胶试件吸湿度约为0.79%。故在常温状态下，由于没有高温的软化作用，MS密封胶试件无法进行吸湿。吸湿温度和吸湿时间共同决定和影响了MS密封胶试件的吸湿度。www.sdyuantai.com

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