| 摘要 |
PURPOSE:To suppress unnecessary surface activity of catalyst and provide necessary organic reactivity by forming a silica gel thin film on the surface. CONSTITUTION:The aimed aluminum borate whisker has a silica gel thin film formed on the surface thereof. The whisker causes no coloring of resin when packed into a high polymer material such as PVC, etc, and is effectively bounded to a coupling agent used in order to improve many physical properties of composite material and further a stable compound is obtained, since surface activity of catalyst is weak. A silica gel thin film is formed on the whisker surface e.g. by suspending whisker in a solvent such as water and adding an aqueous solution of sodium silicate of 0.05-20wt.% expressed in terms of SiO2 to the suspension and heating the mixture to 60-75 deg.C while stirring. pH is adjusted to 6.5-7.0 by adding diluted hydrochloric acid dropwise thereto to simultaneously carry out gel of silica and deposition to whisker surface. Furthermore, the whisker can be produced also by sol gel method or dry type method. |
