| abstract |
The invention discloses an alkane-based foaming B1-level flame-retardant polyurethane rigid foam and a preparation method thereof. The alkane is used as a foaming agent, and a polyether/polyester polyol with specific flame-retardant effect, a catalyst and a foam stabilizer are mixed together. , flame retardants and other special auxiliaries are prepared into combined polyethers, and react with polyisocyanates to form high-index PIR foams. The B1 flame-retardant polyurethane rigid foam in the present invention is mainly suitable for continuous line production process. Compared with other PIR sheet foams, it has the advantages of high flame retardancy, environmental protection, low density, high production latitude, and excellent foam performance. |