Filler Treatment with Famasil Silanes and Titanates（填充治疗Famasil硅烷和钛）.pdfVIP

Fille r T reat ment w it h Fa mas il S ilanes and T itanates Int rod uct ion: The global market of silane surface treatments for fillers and reinforcements has been growing significantly during the past 20 years, Reasons for employing silanes were first to improve abrasion resistance and electrical properties of synthetic rubbers filled with kaolins and clays, later to improve stiffness and heat resistance of engineering thermoplastics with fillers like talc, wollastonite and mica. In recent years, it has been the use of precipitated silica to improve dynamic properties and rolling resistance of automotive tires while replacing carbon black. This latter segment alone generated silane sales of over uro 100 MM in 2006. All these developments were only possible, due to silanes ability to react with the surface of most mineral fillers to impart designed properties. One design feature is also the fact that the organic part of the silane is reacted with the polymer and that this covalent bridging mechanism controls surface properties like adhesion. A large proportion of all thermoplastics, thermosets and elastomers worldwide are compounded and reinforced with fillers and fibers. Their function is to provide specific properties to the final product and to reduce costs. The majority of these fillers are incompatible with the polymer matrix, particularly the inorganic minerals that account for a large majority of the fillers used. Embrittlement, degradation of mechanical properties and increased moisture pickup of the composite can result.To overcome this problem, coupling agents and other surface modifications have been developed. Coupling agents tend to be bifunctional molecules able to bond chemically with both the filler surface and the polymer matrix, which forms a molecular bridge between the two. The strong interfacial bond not only aids the mixing of the two phases but also benefits the overall properties of the composite. The mos