METHOD FOR PRODUCING FIRE-RESISTANT RIGID POLYURETHANE FOAM Russian patent published in 2023 - IPC C09K21/14 C08G18/06 C08G18/48 C08G18/16 C08G18/02 

FIELD: construction and transport industries.

SUBSTANCE: invention relates to a method for producing fire-resistant polyisocyanurate foam, which can be used as an effective and durable heat and sound insulation in construction, automotive, aviation, rail and maritime transport. A method for producing a fire-resistant rigid polyisocyanurate foam from a composition containing a polyester polyol, a polyisocyanate, catalysts, a foaming agent, a stabilizer and flame retardants, by mixing the initial components, whereas the polyether polyol is mixed with a catalyst, a foaming agent, a stabilizer and flame retardants, the resulting mixture is mixed with 120-160 weight parts of polyisocyanate PM-200 in a mechanical stirrer for 10-15 s, and a mixture of expanded graphite EG-350-80 with tert-butyl triphenyl phosphate Disflamoll® 51092 is used as a flame retardant additive in a ratio of 1:0.5-2 wt. at a total concentration of these flame-retardant additives of 5-15 wt.% based on the total number of components in the mixture, whereas the content of the components in the mixture is in the following ratio, wt. parts: Polyether polyol LY-4110 80-120; catalyst Amin A-33 0.5-2; tin dibutyl dilaurate catalyst DBDLO 0.3-1; triethanolamine catalyst 2-4; foaming agent water 1-2; polysiloxane stabilizer L-6900 1-3; flame retardant additive - expanded graphite powder EG-350-80 10-40; flame retardant additive - phosphorus-containing flame retardant tert-butyltriphenyl phosphate Disflamoll®51092 10-40.

EFFECT: reducing the flammability of polyisocyanurate foam while maintaining its physical, heat and sound insulation properties and ensuring low toxicity of combustion and pyrolysis products due to a specially (optimally) selected ratio of fire retardants of various operating principles.

1 cl, 2 tbl, 4 ex