液化柳杉為基質PU發泡體以二乙二醇為溶劑之醇解及其產物回收再利用

Glycolysis of Liquefied Cryptomeria japonica-Based PU Foams in Diethylene Glycol and Utilization of Recycling Products

本研究液化柳杉（Cryptomeria japonica；Japanese cedar）為基質製造PU發泡體，並將此PU發泡體以二乙二醇為溶劑，醋酸鉀為催化劑進行醇解反應，探討其醇解產物與異氰酸酯反應再製PU發泡體之可行性。由試驗結果得知，以液化柳杉為基質之PU發泡體可利用二乙二醇為溶劑，醋酸鉀為催化劑進行醇解反應而得液態產物，此醇解產物添加液化柳杉或PEG-400後可與異氰酸酯反應重新應用於PU發泡體製造，然其發泡性較低，所製造發泡體密度較大，但機械強度較高，方向性較小，耐溶劑性佳。比較兩種原生多元醇之添加效果，添加液化柳杉所製造之PU發泡體密度較低，吸水量較小；添加PEG-400者則密度較高，吸水量較大，耐熱性較佳。 In this study, PU foams were made with liquefied Cryptomeria japonica (Japanese cedar) as the raw materials. The PU foams were glycolysis in diethylene glycol (DEG) with potassium acetate as a catalyst. The feasibility of blending the glycolysis products with PMDI to re-manufacture the PU foams was investigated. The results showed that the PU foams made with liquefied Cryptomeria japonica could undergo the glycolysis reaction and transferred to a liquid type products in diethylene glycol (DEG) with potassium acetate as a catalyst. As blending the glycolysis products with liquefied Cryptomeria japonica or PEG-400, the mixtures could be use to re-manufacture the PU foams by reacting with the PMDI. However, they had lower blowing capability and higher density. But they had higher mechanical strength, lower anisotropic and good solvent resistance. Comparing between the two kinds of fresh polyols added, PU foams made with glycolysis products blending with fresh liquefied Cryptomeria japonica had lower density and water absorption. However, the one blending with PEG-400 had higher density, more water absorption and better heat resistance.

In this study, PU foams were made with liquefied Cryptomeria japonica (Japanese cedar) as the raw materials. The PU foams were glycolysis in diethylene glycol (DEG) with potassium acetate as a catalyst. The feasibility of blending the glycolysis products with PMDI to re-manufacture the PU foams was investigated. The results showed that the PU foams made with liquefied Cryptomeria japonica could undergo the glycolysis reaction and transferred to a liquid type products in diethylene glycol (DEG) with potassium acetate as a catalyst. As blending the glycolysis products with liquefied Cryptomeria japonica or PEG-400, the mixtures could be use to re-manufacture the PU foams by reacting with the PMDI. However, they had lower blowing capability and higher density. But they had higher mechanical strength, lower anisotropic and good solvent resistance. Comparing between the two kinds of fresh polyols added, PU foams made with glycolysis products blending with fresh liquefied Cryptomeria japonica had lower density and water absorption. However, the one blending with PEG-400 had higher density, more water absorption and better heat resistance.