The invention relates to a preparation method of slow-rebound
polyurethane foam. The method is characterized by including the following steps of firstly, heating AA and DEG for esterification
polycondensation reaction, and conducting reaction till the
acid value is 20-25 mgKOH / g; secondly, adding oxidized
carbon black containing carboxyl and hydroxyl functional groups to the product obtained in the first step, conducting vacuumizing, conducting reaction till the
acid value is smaller than or equal to 2.0 mgKOH / g, and increasing the vacuum degree and continuing to conduct reaction to obtain DEG polyhydric alcohols modified by oxidized
carbon black and terminated with hydroxyl groups, namely modified DEG polyhydric alcohols; thirdly, adding chain
extender, catalyst, H2O and polyether triols to the product obtained in the second step to be evenly mixed to prepare a component A for preparing
polyurethane foam; fourthly, conducting heating
polymerization on diisocyanate and polyether triols to prepare a component B for preparing
polyurethane foam, wherein diisocyanate is excessive; fifthly, evenly mixing the component A and the component B for preparing polyurethane foam according to the
molar ratio of hydroxyl groups to
isocyanate groups being 1.0:1.05,
coating a PET film with the mixture according to the thickness of 0.1-0.4 mm, and conducting heating and curing to obtain the slow-rebound polyurethane foam.