| 초록 |
Polyurethane foams have been used as thermal insulatingmaterials for electric appliances such as freezers andrefrigerators, etc.. The polyurethane foams (PUFs) were prepared by polyether polyols, polymeric 4,4’-diphenylmethane diisocyanate (PMDI), silicone surfactants, amine catalysts, distilled water and cyclopentane as a blowing agent. Solid and liquid type fillers were used as a nucleating agent toincrease morphological propertiesof the PUFs as well as improve the thermal insulating properties of the PUFs. The PUFs were prepared by addingnucleating agentsin the range of 1 to 3 wt%. For the liquid type nucleating agnets, the cell size of the PUFs showed minimum and found to decrease compared the PUF without addingnucleating agents.Also, thermal conductivity of the PUFs with adding nucleating agentshad best thermal insulating properties. From these results, it is suggested that the thermal insulating property of the PUFs can be improved by addingnucleating agents. |
