METHOD OF PRODUCING POLYISOCYANURATE POLYURETHANE MATERIAL Russian patent published in 2011 - IPC C08G18/16 C08G18/48 C08G18/76 C08G101/00 

FIELD: chemistry.

SUBSTANCE: method involves reaction of polyisocyanate and a component capable of reacting with isocyanate, where the reaction takes place at isocyanate index between 1600 and 100000 and in the presence of a trimerisation catalyst, and where content of hard blocks is at least equal to 50%. The polyisocyanate contains a) 75-100 wt % diphenyl methane diisocyanate which contains at least 40 wt % 4,4'-diphenyl methane diisocyanate and/or a derivative of the said diphenyl methane diisocyanate, which is liquid at 25°C and has NCO value of at least 20 wt % (polyisocyanate a), and b) 25-0 wt % of another polyisocyanate (polyisocyanate b), where the amount of polyisocyanate a) and polyisocyanate b) is calculated based on total amount of that polyisocyanate a) and polyisocyanate b). The component capable of reacting with isocyanate contains a) 80-100 wt % polyether polyol having average nominal functionality of 2-6, average equivalent weight of 1100-5000 and oxyethylene content of 65-100 wt %, and b) 20-0 wt % of one or more groups of compounds capable of reacting with isocyanate, where the amount of polyol a) and compound b) is calculated based on total amount of that polyol a) and compound b).

EFFECT: obtaining materials with low residual concentration of NCO groups, having high modulus of elasticity, high impact strength, heat- and fire-resistance, low brittleness, short demoulding time and high cohesion strength.

6 cl, 3 ex