耐高温RTV-1硅酮密封胶的性能研究  

Study on the performance of high-temperature resistant RTV-1 silicone sealant

作　　者：蒙嘉华 陈炳耀 林志鹏 郭仕川 董颖 Meng Jiahua;Chen Bingyao;Lin Zhipeng;Guo Shichuan;Dong Ying(Guangdong SANVO Holdings Co.,Ltd.,Zhongshan 528400,Guangdong,China;Zhongshan Minhe Chemical Technology Co.,Ltd.,Zhongshan 528400,Guangdong,China)

机构地区：[1]广东三和控股有限公司,广东中山528400 [2]中山市珉和化工科技有限公司,广东中山528400

出　　处：《中国胶粘剂》2025年第3期51-55,共5页China Adhesives

摘　　要：本研究以α,ω-端羟基二甲基硅氧烷(107硅橡胶)为主原料,添加硅微粉、纳米碳酸钙和气相法二氧化硅等填料,并加以交联剂、硅烷偶联剂、催化剂和耐热添加剂,制得室温固化单组分耐高温硅酮密封胶。探讨了配方中不同黏度的107硅橡胶配比及含量、不同配比的填料以及耐热添加剂种类对硅酮密封胶粘接性能和耐热性能的影响。研究结果表明:(1)不同黏度的107硅橡胶配比对硅酮密封胶性能的影响研究中发现,当高黏度107硅橡胶的质量分数占比较高时,制得的硅酮硅密封胶的断裂伸长率也较高,但其拉伸强度、硬度则较低,且表干时间偏慢。(2)选择黏度为80000 mPa·s的107硅橡胶与20000 mPa·s的107硅橡胶等比例进行添加,且总添加量在50份时,室温拉伸强度为2.51 MPa,断裂伸长率可达到407%,且其耐高温性能较佳。(3)不同配比的碳酸钙与硅微粉对硅酮密封胶的粘接性能及耐温性能均有较大影响。随着碳酸钙比例的增加,硅酮密封胶对基材的粘接力值也逐步加大,但力值增加的幅度逐渐减小;相比于金属基材,硅酮密封胶对塑料基材的粘接性更加牢固。碳酸钙与硅微粉常用作硅酮密封胶的填料,硅微粉相比于碳酸钙,在一定程度上可提高硅酮密封胶的耐温性能。(4)耐热添加剂中的金属氧化物,可以在不同程度上提高硅酮密封胶的耐热性能。Usingα,ω-hydroxydimethylsiloxane(107 silicone rubber)as the main raw material in this study,adding fillers such as silicon micro powder,nano calcium carbonate and fumed silica,and adding crosslinking agents,silane coupling agents,catalysts,and heat-resistant additives,high-temperature resistant single-component silicone sealant cured at room temperature was then prepared.The effects of different viscosity ratios and contents of 107 silicone rubber in the formula,different ratios of fillers,and types of heat-resistant additives on the bonding properties and heat-resistance properties of silicone sealant were explored.The research results showed that,(1)In the study on the influence of different viscosity ratios of 107 silicone rubber on the performance of silicone sealant,it was found that when the mass fraction of high viscosity 107 silicone rubber was relatively high,the elongation at break of the silicone sealant produced was also high,but its tensile strength and hardness were low,and the surface drying time was slow.(2)When adding 107 silicone rubber with a viscosity of 80000 mPa·s and 107 silicone rubber with a viscosity of 20000 mPa·s in equal proportions,and the total amount added was 50 parts,the tensile strength at room temperature was 2.51 MPa,the elongation at break could reach 407%,and also its high temperature resistance was excellent.(3)Different ratios of calcium carbonate and silicon micro powder had a significant impact on the bonding properties and temperature resistance of silicone sealant.As the proportion of calcium carbonate increased,the bonding strength of silicone sealant to the substrate gradually increased,but the magnitude of the increase in force gradually decreased.Compared to metal substrates,silicone sealant had stronger adhesion to plastic substrates.Calcium carbonate and silicon micro powder were commonly used as fillers for silicone sealant.Compared with calcium carbonate,silicon micro powder could improve the temperature resistance of silicone sealant to a certain extent.(4

关 键 词：硅酮密封胶 耐高温 107硅橡胶 硅微粉 耐热添加剂 

分 类 号：TQ436.6[化学工程]