| 摘要 |
PURPOSE: A spray type hard PIR polyurethane foam composition is provided for maintaining self-extinguish property of the foam to early suppress fire by deriving plenty of isocyanate radicals in urethane functional groups by reacting resin premix and organic polyisocyanate. CONSTITUTION: A spray type hard PIR polyurethane foam composition comprises 48-52 wt% of a resin premix containing 44-67 weight parts of polyol mixture composed of polyesterpolyol having 300-800 molecular weight and 2-4 functional groups and polyetherpolyol having 300-800 molecular weight and 3-6 functional groups in a weight ratio of 90-50:10-50, and 5-15 weight parts of flame-retardant agent, 0.00-2.0 weight parts of cross-linking agent, 1.0-2.0 weight parts of amine based urethane catalyst, 2.0-7.0 weight parts of metal trimer, 1.0-2.0 weight parts of silicon oil, 0.1-3.0 weight parts of water and 15-25 weight parts of foaming agent. The composition also includes 52-48 wt% of polyisocyanate having 30-33 wt% of isocyanate radicals and 2.0-3.5 isocyanate index. |
