Performance characterization of rigid polyurethane foam with refined alkali lignin and modified alkali lignin
The two kinds of rigid polyurethane (PU) foams were prepared with respectively adding the refined alkali lignin and alkali lignin modified by 3-chloro-1,2-epoxypropane to be instead of 15% of the polyether glycol in weight. The indexes of mechanical performance, apparent density, thermal stability and aging resistance were separately tested for the prepared PU foams. The results show that the mechanical property, thermal insulation and thermal stability for PU foam with modified alkali lignin are excellent among two kinds of PU foams and control samples. The additions of the refined alkali lignin and modified alkali lignin to PU foam have little effect on the natural aging or heat aging resistance except for decreasing hot alkali resistance apparently. Additionally, the thermal conductivity of modified alkali lignin PU foam is lowest among two kinds of PU foams and control samples. The alkali lignin PU foam modified by 3-chloro-1,2-epoxypropane could be applied in the heat preservation field.
作 者： LIU Zhi-ming YU Fei FANG Gui-zhen YANG Hui-jun 作者单位： Key Laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, P.R. China 刊 名： 林业研究（英文版） 英文刊名： JOURNAL OF FORESTRY RESEARCH 年，卷(期)： 2009 20(2) 分类号： S7 关键词： refined alkali lignin modified alkali lignin rigid PU foam mechanic performance thermal stability