沸石补强硅酮建筑密封胶的应用

Application of Silicone Building Sealant Reinforced by Zeolite

考察了用沸石和焙烧沸石作为补强剂用于制备硅酮建筑密封胶的工艺过程,分析了粉体用量对密封胶热稳定性、拉伸强度、断裂伸长率、干燥时间的影响;用扫描电镜(SEM)、X射线衍射(XRD)、氮气吸-脱附等温测试(BET)和脱附孔径测试(BJH)方法对沸石和焙烧沸石的微观形貌、物相、比表面积、孔容和孔径进行了表征;研究结果表明,它们是一种具有多孔结构的铝硅酸盐矿物,主要成分分别为KNa2Ca2(Si29Al7)O72和K(Si3Al)O8,孔径分别为10.68 nm和14.02 nm,孔体积分别为0.465 5 mL/g和0.587 1 mL/g,比表面积分别为153.6 m2/g和191.4 m2/g,孔径分布宽、孔体积和比表面积大有利于补强,焙烧沸石的补强性优于沸石,揭示了它们的补强作用是硅烷偶联剂表面改性、孔道效应和锚固效应共同作用的结果。

This paper describes the process of preparing silicone building sealants using zeolite and baked zeolite as reinforcing filler.The effect of the amount of zeolite and baked zeolite on the properties of the corresponding sealants,such as thermal stability,tensile strength,elongation at break and drying time was studied.The morphologies,components,specific surface area,porous volume and pore size distribution of zeolite and baked zeolite were characterized respectively by scanning electron microscope（SEM）,X-ray diffraction（XRD） and nitrogen adsorption-desorption investigation（BET-BJH）.The results show that zeolite and baked zeolite were a kind of porous materials composed of aluminosilicate.Their main ingredients were KNa2Ca2（Si29Al7）O72 and K（Si3Al）O8.Their pore size,porous volume and specific surface area were 10.68 nm and 14.02 nm,0.465 5 mL/g and 0.587 1 mL/g,153.6 m2/g and 191.4 m2/g,respectively.The wider pore size distribution and greater pore volume and specific surface area were conducive to reinforcement.The reinforcement effect of roasting zeolite was better than that of zeolite,which was brought about by the synergism of mineralogical effect,anchorage effect and surface modification of the silane coupling agent.