Silica and diatomite fillers modified fluorine rubber composites treated by silane-coupling agents

The fluorine rubber nanocomposites were prepared by using the silane-coupling agents treated silica and diatomite, in which 3-amino propyltriethoxysilane (KH550), 3-mercapto-propyl trimethoxysilane (KH590), and bis-(gamma-triethoxysilylpropyl)-tetrasulfide (Si69) of the coupling agent were used as the filler modifiers to increase the compatibility between filler and fluorine rubber. The structure and morphology of the composites were investigated by Fourier transform infrared spectroscopy and scanning electron microscopy. The T-g and thermal stability of the composites were investigated by dynamic mechanical analysis and thermogravimetric analysis. The results showed that the best coupling agent was KH550 and 2 phr (parts per hundred rubber). The KH550-modified compound filler was crosslinked with fluorine rubber, and the compatibility between filler and fluorine rubber was improved and further confirmed to improve the thermal properties of fluorine rubber with the KH550-modified filler. J. VINYL ADDIT. TECHNOL., 26:55-61, 2020. (c) 2019 Society of Plastics Engineers