POTTING COMPOUND FOR PRODUCING RIGID POLYURETHANE FOR PRE-INSULATED PIPES Russian patent published in 2014 - IPC C08G18/12 C08G18/18 C08G18/32 C08L75/04 C08J9/08 C08G101/00 

FIELD: chemistry.

SUBSTANCE: composition contains a polyether polyol - oxypropylated glycerine, foaming agent - water, catalyst, fire retardant, foam stabiliser, polyisocyanate and additionally contains polyether polyols: polyether obtained by oxypropylation of glycerine and saccharose, polyether obtained by polymerising ethylene oxide with ethylene glycol; foam stabiliser - non-hydrolysable silicone surfactant; catalyst - pentamethyldiethylenetriamine; fire retardant - trichloropropyl phosphate, with the following ratio of components, wt %: oxypropylated glycerine 12.0-18.0; polyether obtained by oxypropylation of glycerine and saccharose 10.0-14.0; polyether obtained by polymerising ethylene oxide with ethylene glycol 1.0-2.0; water 2.0-4.0; pentamethyldiethylenetriamine 0.1-0.5; non-hydrolysable silicone surfactant 0.5-1.0; trichloropropyl phosphate 8.0-10.0; polyisocyanate - the balance.

EFFECT: obtaining an environmentally safe fire-resistant composition, which provides improved strength properties of the finished rigid polyurethane and the required density level according to requirements for heat-insulation materials, water absorption while maintaining an optimum start time sufficient to mould a foamed article with uniform density in the volume and a good outer surface.

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