摘要
为进一步改善超细CaCO3的表面活性,利用γ-氨基丙基三乙氧基硅烷偶联剂(KH-550)对超细CaCO3进行表面改性,采用密炼工艺制备了超细CaCO3/热塑性丁苯橡胶(SBS)复合材料.通过红外光谱(FT-IR)、热重分析(TGA)、接触角测定仪(CAMI)和粒径分析等研究了改性前后超细CaCO3的结构变化,采用橡胶加工分析仪(RPA)和扫描电子显微镜(SEM)等对改性前后超细CaCO3的复合材料的力学性能和微观形貌进行了测试分析.结果表明:硅烷偶联剂KH-550与超细CaCO3粉体间能形成化学结合,修饰后的超细Ca-CO3能有效阻止颗粒间团聚,并均匀分散在橡胶胶体中,与胶体间形成物理和化学交联结构;改性后超细Ca-CO3在SBS体系中能形成网状结构,材料力学性能明显提高;当活化超细CaCO3的质量分数为20%时,能获得性能优异的复合材料.
To improve the superficial capacity of ultra-fine calcium carbonate（CaCO3） powder,γ-aminopropyltriethoxylsilane coupling agent（KH550） was used as modifier to modify its surface activity.Then the CaCO3/SBS composites were prepared by mixing the ultra-fine CaCO3 powder with thermoplastic butadiene-styrene rubber（SBS）.The structural changes of the unmodified and modified ultra-fine CaCO3 powder were characterized by Fourier transform infrared spectroscopy（FTIR）,thermogravimetric analysis（TGA）,contact angle measuring instrument（CAMI）,size distribution.The mechanical properties of the composites were studied by rubber processing analyzer（RPA） and scanning electron microscopy（SEM）,respectively.The results showed that the chemical combination ccould be formed between KH-550 and CaCO3 particles,and the surface modification could effectively restrict the agglomeration of CaCO3 particles.The modified CaCO3 particles could be dispersed equally in rubber and formed physical and chemical crosslinking structure with rubber.The mechanical properties of composites were increased due to the network structure of CaCO3 with SBS.The excellent mechanical properties,processing propterties and aging resistance of composites were obtained when the content of modified CaCO3 was 20%.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2013年第1期49-55,共7页
Materials Science and Technology
基金
安徽省高校省级优秀青年人才基金资助项目(2011SQRL036ZD
2009SQRZ065)
关键词
超细CACO3
硅烷偶联剂
表面修饰
热塑性丁苯橡胶
交联结构
ultra-fine CaCO3
silane coupling agent
surface modification
thermoplastic butadiene-styrene rubber
crosslinking structure
