シランカップリング処理を施した亜鉛-シリカ複合めっきの表面性状とゴム接着性

抄録

The effects of surface morphology, silica codeposition and silane coupling treatment on the rubber adhesion of electroplated zinc have been studied using shear tensile tests and ESCA. No primer or adhesive was used at the interface of the rubber and the deposit. While the adhesion strength of rubber to the non-silane-coupled zinc deposit, with or without codeposited silica particles, was too small to measure, its adhesion strength to smooth and fan-shaped zinc deposits treated with 3-mercaptopropyltrimethoxysilane (3-MPS) was 2.7MPa and 3.4MPa, respectively. After shear tensile tests, however, adhesion failed commencing at the interface of the rubber and the deposit. When the fan-shaped zinc contained 1.6wt% of silica and was treated with 3-MPS, rubber adhesion strength increased to 5.3MPa, and the percentage of the area detached after the shear tensile tests was 70% at the deposit-to-rubber interface, and 30% at the rubber. ESCA analysis of electroplated zinc-silica composite surfaces with and without 3-MPS treatment indicated that some of the 3-MPS reacted with the silica particles and some bonded with OH radicals contained in the surface oxide of the zinc matrix.