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Effects of Isocyanate Index and Aging on the Physical Properties of Polyurethane Foams  

Kwon Hyun (R&D Center, Finetec Cooperation)
Kim Sang-Bum (Department of Chemical Engineering, Kyonggi University)
Kim Youn Cheol (Division of Chemical Engineering, Kongju National University)
Publication Information
Polymer(Korea) / v.29, no.5, 2005 , pp. 457-462 More about this Journal
Abstract
Polyurethane foams (PUFs) were prepared from polymeric 4,4'-diphenylmethane diisocyanate (PMDI), mixed polyol with OH value of 480, silicone surfactant, three catalysts, and hydrofluorocarbon(HFC) as blowing agent. Balance (PC-8), gelling (33LV), and trimerization (TMR-2) catalysts were used. The effect of the catalysts on the physical properties of PUF with increase of isocyanate (NCO) index and aging time was investigated. The cell size of the PUF with PC-8 and 33LV slightly increased with an increase in NCO index from 100 to 170 but compressive strength did not change significantly. In case of trimerization catalyst, the compressive strength of PUF increased from 8.75 to 1$10.5 kg_f/cm^2$ and the cell size decreased with an increase in NCO index. The compressive strength of the PUF with 33LV increased from 9.21 to $10.15 kg_f/cm^2$ with an increase in aging time. However, there was no detectable change in the compressive strength of PUF with TMR-2. A possible interpretation of the results includes an additional cross-link reaction of non-reacted MDI and FTIR spectrum illustrated the change of NCO peak.
Keywords
polyurethane foam; hydrofluorocarbon; NCO index; aging; catalyst.;
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