| 摘要 |
It is known to include a coupling agent (silane) in a filled cycloaliphatic amino hardened resin system which is employed in coating resin bonded glass fibre rods used as electrical insulators. It has been found that the method of introducing the coupling agent in the filled cycloaliphatic amine hardened resin system is critical to the success of the subsequent coating process. The invention lies in a method of preparing and treating a substrate of resin coated glassfibre material prior to coating with the filled cycloaliphatic amine hardened resin system which comprises the following steps: a) the surface of the substrate is abraded or ground to remove the thin resin-rich surface layer which is formed during preparation of the material, thus exposing the composite structure of the rod and providing a roughened surface to promote mechanical adhesion, b) the exposed roughened surface is painted overall with the silane coupling agent. The coating of the substrate with the filled resin system is preferably carried out in a mould whilst the substrate is in a state of stress e.g. under an applied tension, and the coating is preferably also cured whilst the stress is maintained in the substrate. Thus when the substrate is released from the mould the applied coating/interface is in a state of compression shear. |
