| 摘要 |
<p>An improved method of producing treated silica filler for use with silicone rubber operates at ambient temperature in a short period of time. The method consists essentially of mixing reinforcing silica with a volatile treating agent of the formula RxS-(OR min )4-x, wherein R is a substituted or unsubstituted, saturated or unsaturated, alkyl or aryl radical having from 1 to 6 carbon atoms, R min is an alkyl radical having from 1 to 3 carbon atoms, x is 1 or 2 and R and R min are chosen so that the vapor pressure of the alkoxysilane exceeds 0.005 atmosphere at treatment temperature, in combination with a volatile catalyst selected from the group consisting of acid A, base B and mixtures thereof; wherein acid A is a volatile acid or acid progenitor and base B is a silylamine or silazane, acid A and base B being chosen so that the vapor pressure of either acid A or base B exceeds 0.005 atmosphere at treatment temperature, for a period of time sufficient to allow the desired amount of treating agent to be adsorbed onto the surface of the particulate filler.</p> |
