聚氨酯密封胶温度和应变率影响的强度分析

发布时间 : 2023-3-23 11:48:49
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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.

聚氨酯密封胶温度和应变率影响的强度分析

(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 : 2023-3-23 11:48:49
Views:

为了分析聚氨酯密封胶材料的物性状态随温度的变化情况，并确定材料的玻璃化转变温度。利用动态力学分析仪DMA-Q800对HP-172B硅烷改性聚氨酯聚氨酯密封胶材料进行恒定频率下、温度匀速增大的温度扫描试验。如图3.1所示。试验测出三种特性参数:储存模量、损耗模量和损耗因子。其中，储存模量即杨氏模量，是材料变形后回弹的指标，表示材料存储弹性变形能量的能力;损耗模量是描述材料产生形变时能量转化为热的现象，是能量损失的量度，也是材料的粘性本质;损耗因子代表每周期耗散能量与在这周期内的最大储能之比，也是损耗模量与储存模量之比。三种特性参数都可以作为判断材料玻璃化转变温度的指标，需结合材料本身的物性特点和力学性质来决定。

从图3.1可知，储存模量曲线分别在42.03 ℃和210.06℃有两个明显的峰，表明材料经历了两个相变。损耗模量的峰值处所对应的温度为228.67℃，损耗因子的峰值处所对应的温度为244.56℃。因为聚氨酯密封胶材料具有粘弹性，需要考虑粘性变形造成的能量损失，而损耗模量又是材料的粘性本质。于是，本文利用损耗模量的峰值来定义Tg。则可知材料的玻璃化转变温度为228.67℃。

上一节对聚氨酯密封胶材料进行了温度扫描试验，并测出它的玻璃化转变温度Tg。因此在温度变化的试验测试中，要保证温度的变化范围在该材料的玻璃化转变温度以下。于是，在玻璃化转变温度以下，分别对材料进行了温度变化和应变率变化的强度拉伸测试。本章用热力学温度(T)来进行分析。www.sdyuantai.com

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