| 摘要 |
<p>Polyurethane polyisocyanurate foam reinforced by glass fibers, obtained by: reacting an isocyanate component and a polyol component comprising first, second and third polyols, in the presence of a catalyst (preferably tin salts, potassium carboxylate and optionally tertiary amines), a physical and/or chemical blowing agent, an emulsifier and optionally a flame retarding agent to obtain a composition; impregnating, the composition in a glass fiber stacking; and expanding and solidifying the composition to form a reinforced foam block containing the glass fiber stacking. Polyurethane polyisocyanurate foam reinforced by glass fibers, obtained by: reacting an isocyanate component having a viscosity of 200-600 mPa.s and a polyol component comprising first, second, and third polyols having a viscosity of 200-6000 mPa.s, in the presence of a catalyst (preferably tin salts, potassium carboxylate and optionally tertiary amines), a physical and/or chemical blowing agent, an emulsifier and optionally a flame retarding agent to obtain a composition; impregnating, the composition in a glass fiber stacking; and expanding and solidifying the composition to form a reinforced foam block (having an average density of 115-135 (preferably 130) kg/m 3>, and an isocyanate index of 100-180 (preferably 130-180)) containing the glass fiber stacking. An independent claim is included for the preparation of foam.</p> |
