混合填料不同配比对免垫片硅酮密封胶性能的影响  

Effect of different ratio of mixed fillers on properties of gasket-free silicone sealant

作　　者：李林峰 陈炳耀 全文高 蒙嘉华 欧佳丽 LI Linfeng;CHEN Bingyao;QUAN Wengao;MENG Jiahua;OU Jiali(Guangdong Sanhe Holdings Co.,Ltd.,Zhongshan 528429,Guangdong China)

机构地区：[1]广东三和控股有限公司,广东中山528429

出　　处：《粘接》2025年第1期5-7,19,共4页Adhesion

摘　　要：免垫片硅酮密封胶是一种可以用于要求高密封性的场合,如汽车、高铁、航天航空等领域的单组分室温硫化型密封胶。通过在密封胶中加入填料,可以提升密封胶的理化性能。以纳米碳酸钙和硅微粉作为填料,在填料总质量固定的情况下研究不同填料比例对免垫片硅酮橡胶性能的影响。试验发现,当纳米碳酸钙与硅微粉的质量比减小时,免垫片硅酮胶的表干速度、固化深度和耐高温性有所增加,而力学性能和对金属基材的粘接性能逐渐减弱。结合综合性能,纳米碳酸钙与硅微粉的质量比为5∶2时制备的免垫片硅酮密封胶具有更全面的理化性能。Gasket-free silicone sealant is a single component room temperature vulcanized sealant that can be used in applications requiring high sealing,such as automobiles,high-speed rail,aerospace and other fields.By adding filler to the sealant,the physical and chemical properties of the sealant can be improved.In this paper,nano calci⁃um carbonate and silicon powder were used as fillers to study the effects of different filler ratios on the properties of gasket-free silicone rubber under the condition that the total mass of fillers was fixed.It was found that when the mass ratio of nano-calcium carbonate to silicon powder decreased,the surface drying speed,curing depth and high temperature resistance of gasket free silicone adhesive increased,but the mechanical properties and adhesion to metal substrate gradually weakened.Combined with the comprehensive properties,the gasket-free silicone sealant prepared when the mass ratio of nano-calcium carbonate to silicon powder is 5∶2 has more comprehensive physical and chemical properties.

关 键 词：硅微粉 纳米碳酸钙 免垫片硅酮密封胶 

分 类 号：TQ436.6[化学工程]