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Effects of Catalysts and Blowing Agents on the Physical Properties and Cell Morphology of Polyurethane Foams  

Kwon, Hyun (R&D Center, Finetec Cooperation)
Lee, Su Heon (R&D Center, Finetec Cooperation)
Kim, Sang Bum (Major in Chemical Engineering, Kyonggi University)
Bang, Moon-Soo (Division of Chemical Engineering, Kongju National University)
Kim, Youn Cheol (Division of Chemical Engineering, Kongju National University)
Publication Information
Applied Chemistry for Engineering / v.16, no.3, 2005 , pp. 379-384 More about this Journal
Abstract
Polyurethane foams (PUFs) were prepared from polymeric 4,4'-diphenylmethane diisocyanate (PMDI), seven polyols with different functionalities and OH values, silicone surfactant, two catalysts, and three blowing agents. Chlorofluorocarbon (CFC-11), hydrochlorofluorocarbon (HCFC-141b) and hydrofluorocarbon (HFC-365mfc) were used as blowing agents. The effect of gelling and blowing catalysts on basic properties and cell structure of PUF with HCFC-141b was investigated. The cell size of the PUF decreased with an increase in the amount of catalyst from 0 to 2 pph (parts per hundred polyol). In the case of gelling type catalyst, the compressive strength increased from 11.9 to $12.66kg_f/cm^2$ with an increase in the amount catalyst from 0 to 2 pph but the density did not change significantly. The gelling time, density, and compressive strength of the PUF with three different blowing agents were measured. There was no detectable change in their properties. However, the cell structure of PUF with HCFC-141b was not uniform as in the other systems.
Keywords
polyurethane foam; blowing agent; gelling catalyst; blowing catalyst;
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