The production process of quasi pru00c9polu00cdmeros polyurethane based mixture of monomers 2, 4 '- diphenylmethane diisocyanate (MDI) and 4,4' - diphenylmethane diisocyanate (MDI), with low content of free monomer.

摘要

The power polu00cdmero polyurethane is prepared on the basis of a mixture of 2,4 - diisocyanate MDI monomers 4,4 - diphenylmethane diisocyanate, and diphenylmethane are reacted with a polyol - poliu00c9ter functionality suitable with high molecular weight, in order to achieve a suitable plastificau00c7u00c3o in Tender and a low content of free isocyanate monomer.To improve the flexibility of the polu00cdmero power may be used mixtures of esters of acids carboxilicos with citrate. The concentration of free isocyanate monomer after production is below 1%.