| 摘要 |
A release agent system provides a water-soluble releasing interface which permits a plurality of cycles of the mold between applications with reaction-injection molding materials such as glass-reinforced urethane. The system can provide on the mold surface a base coat, including a polymer release agent with groups capable of bonding to the mold surface (e.g., a carboxy-terminated silicone) and a bonding or cross-linking agent (e.g., tetraisopropyltitanate), which reacts with and cross links the polymer and provides bonding with the mold surface and for soap-like materials, and a releasing film, which is a water-soluble soap-material (e.g., one or more water-soluble, metallic salts of long-chain fatty acids such as sodium myristate). Such a system can be particularly adapted for use with urethane RIM materials. |
