Method of forming polyurethane foam sheet exhibits high resilience similar to a latex characteristics.

摘要

Method of forming a polyurethane foam in high resilience slab having random cell structures and displaying characteristics like feel and behavior latex-, said method comprising the steps of: providing an isocyanate-reactive component; providing an isocyanate component that is substantially free of toluene diisocyanate and comprises diphenylmethane-2, 4 '- diisocyanate present in an amount of 15 parts by weight to 55 parts by weight based on 100 parts by weight of the isocyanate component and diphenylmethane -4, 4 '' - diisocyanate present in an amount of 45 parts by weight to 85 parts by weight based on 100 parts by weight of the isocyanate component to react with the isocyanate-reactive component; providing a first nucleation gas under low pressure; adding the first nucleation gas into at least the isocyanate-reactive component or the isocyanate component, or both, to produce a cell primeraestructura in the polyurethane foam; and providing a second nucleation gas under low pressure, wherein the second nucleation gas is different than the first nucleation gas; and adding the second nucleation gas into at least the isocyanate-reactive component or the isocyanate component, or both, to produce a second cell structure in the foam that is different from the first cell structure, so that the first cell structure and the second cell structure improves in polyurethane foam iron, characteristics like feel and latex-behavior.