不同填料对硅烷改性聚氨酯密封胶弹性模量的影响

发布时间 : 2026-8-28 9:54:36
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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.

不同填料对硅烷改性聚氨酯密封胶弹性模量的影响

(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 : 2026-8-28 9:54:36
Views:

不同填料对硅烷改性聚氨酯密封胶应力应变和弹性模量的影响。改性硅烷改性聚氨酯密封胶的应力一应变曲线改性后的环氧树脂硅烷改性聚氨酯密封胶的应力一应变结果如所示。由图可知，曲线分为OA,AB,BC这3个阶段。OA阶段呈直线，在拉应变增大时，拉应力线性增加，二者表现为正比关系。如果将应力去除，则恢复原样，即存在显著的弹性特征。曲线中的A点为试件最大应力。在AB阶段中，曲线开始呈现出上凸特征，应变的变化速率显著高于应力，二者不再为正比关系。在该阶段中逐步有弹性变形变为塑性变形，在达到B点时均不存在显著的屈服点。BC阶段从最大值逐渐减小，达到G点断裂。为10%组合填料下的应力一应变曲线。可知，OA阶段试件应力和应变线性相关;在AB阶段中，曲线基本是水平的，应变在增大时应力总体是稳定的，即表现出显著的塑性特征;在BC阶段中，曲线表现为上凸形态，随着拉应变的增加，拉应力也在持续上升，但是曲线斜率相对于第1个阶段更低。最终在达到G点时，试件出现断裂。分析其原因是齐口断裂形成气泡引发了断裂。

不同填料硅烷改性聚氨酯密封胶的弹性模量如表所示。由表可知，在组合填料掺量分别为3%,7%时，均显著提升了弹性模量，二者分别为2.62,3.15 GPa,相对于基体分别提升40.1%,68.4%。在超过7%之后，掺量继续增加，弹性模量并未出现显著的增长，甚至出现了一定程度的下滑，但始终高于基体。

综上所述，当组合填料的掺量为5%时，对应的抗压强度为87.57 MPa，抗拉强度为48.36 MPa，弹性模量为3.15。另外，在掺人的组合填料分别为5% ,7%,10%时，硅烷改性聚氨酯密封胶有良好的力学性能、弹性模量、抗拉强度、抗压强度，同时节约了成本，适合于应用到建筑工程领域中。

通过上述试验，大大提高了传统硅烷改性聚氨酯密封胶的力学性能，说明通过纳米碳酸钙和纳米白炭黑的改性可行。使用纳米碳酸钙和纳米白炭黑改性相对于单一改性的机理在于传统的纳米碳酸钙其粒径在100 nm,纳米白炭黑材料的粒径为20 nm左右。通过以上研究，得出以下几点结论，一是组合填料的掺量为5%时，得到的硅烷改性聚氨酯密封胶性能最佳;二是硅烷改性聚氨酯密封胶的最佳比例为:固定剂50%，偶联剂和稀释剂分为环氧树脂的4%、10%，组合填料掺量为5%。http://www.sdyuantai.com/

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