Modified cardanol-based polyether polyol and high-fire-resistant hard polyurethane foam prepared by modified cardanol-based polyether polyol and preparation method thereof

The invention discloses a modified cardanol-based polyether polyol and high-fire-resistant hard polyurethane foam prepared by the modified cardanol-based polyether polyol and a preparation method thereof. The polyether polyol takes cardanol, paraformaldehyde, diethanolamine, diethylenetriamine, tribromoaniline, melamine, oxirane and epoxypropane as raw materials, the raw materials are reacted for synthesis of cardanol Mannich polyether polyol, a hydroxyl value is 200-700mg/gKOH, the moisture is less than or equal to 1.0%, the viscosity is 1000-12000 mPa.s (at 25 DEG C), and the cardanol-based polyether polyol can be taken as a polyhydric alcohol component which can be used in the hard polyurethane foam. The product has advantage of adjustable functionality, contains a flame-retardant group, and has good compatibility with a cyclopentane foaming agent.