纳米碳酸钙/二氧化硅复合粒子的制备及其在丁苯橡胶中的应用

摘要

Integrating the processes of preparation of nano-sized CaCO3 and its surface-coating,CaCO3/SiO2 core-shell nanoparticles were prepared by sol -precipitation method using sodium silicate as silica source.A layer of dense silica membrane was coated on the surface of nano-sized calcium carbonate.Size, morphology, chemical composition, structure, and surface properties of the composite nanoparticles were characterized by TEM, FT -IR, TG, XRD, BET, and oil absorption measurement etc..As the CaCO3/SiO2 nanoparticles were applied in SBR vulcanizate ,the tensile strength and tearing strength of SBR vulcanizate were improved remarkably .When the filling amount of the CaCO/SiO2 nanoparticles was 75 phr,the SBR vulcanizate had the maximum tensile strength( 13.6 Mpa).%将纳米碳酸钙的制备和表面包覆工艺融为一体,以硅酸钠为无机硅源,采用溶胶沉淀法制备出具有核壳结构的纳米碳酸钙/二氧化硅复合粒子,在纳米碳酸钙的表面包覆了一层致密的二氧化硅膜.采用TEM、红外光谱(FT-IR)、TG、XRD、BET、吸油值测定等手段对复合粒子的大小、形貌、化学组成、结构及表面性质进行了分析和表征.将复合粒子填充于丁苯橡胶,能显著提高丁苯橡胶(SBR)硫化胶的拉伸性能和撕裂性能.当填充量为75份时,拉伸强度最大,为13.6 MPa.