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

FIELD: chemistry.

SUBSTANCE: invention relates to an elastomeric polyisocyanurate polyurethane material with 5-45% content of hard blocks, Shore hardness A 10-99 (DIN 53505) and elongation at fracture 5-1000% (DIN 53504), as well as a method of producing said material. Said material is obtained by reacting polyisocyanate with a component which is capable of reacting with isocyanate, where the reaction is carried out at isocyanate index ranging from 150 to 5000 and in the presence of a trimerisation catalyst. The polyisocyanate contains a) 80-100 wt % diphenylmethane diisocyanate which contains at least 40 wt % 4,4'-diphenylmethane diisocyanate and/or modified diphenylmethane diisocyanate which, at temperature 25°C, is a liquid and has NCO value of at least 20 wt % (polyisocyanate a), and b) 20-0 wt % of another polyisocyanate (polyisocyanate b), wherein the amount of polyisocyanate a) and polyisocyanate b) is calculated based on the total amount of polyisocyanate a) and polyisocyanate b). The component which is capable of reacting with isocyanate contains a) 80-100 wt % polyether polyol with average nominal functionality 2-6, average equivalent weight 1100-5000 and oxyethylene (EO) content 50-90 wt %, and b) 20-0 wt % of another one or more groups of compounds capable of reacting with isocyanate, where the amount of polyol a) and compound b) is calculated based on the total amount of polyol a) and compound b).

EFFECT: obtaining elastomeric materials with low modulus, high elongation at fracture, good thermal stability and resistance to inflammation, short setting time and good mould release properties.

7 cl, 2 ex, 1 tbl