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| Chemical Modification of Organosolv Lignin into Polyol and Preparation of Polyurethane Rigid Foam |
| Received:June 10, 2024 |
| DOI：10.11980/j.issn.0254-508X.2024.12.002 |
| Key Words:organosolv lignin polyurethane foam polyols compressive strength |
| Fund Project:齐鲁工业大学科教产融合基金（2023PYI008）。 |
| Author Name | Affiliation | Postcode | | GENG Chuanmin | State Key Lab of Biobased Materials and Green Papermaking, Qilu University of Technology （Shandong Academy of Sciences）, Ji’nan, Shandong Province,250353 | 250353 | | JIANG Chengzhen | Jinan Shengquan Group Co., Ltd., Ji’nan, Shandong Province, 250200 | 250200 | | TANG Lei | Jinan Shengquan Group Co., Ltd., Ji’nan, Shandong Province, 250200 | 250200 | | GAO Shaofeng | Jinan Shengquan Group Co., Ltd., Ji’nan, Shandong Province, 250200 | 250200 | | ZHANG An | Jinan Shengquan Group Co., Ltd., Ji’nan, Shandong Province, 250200 | 250200 | | YANG Xuelu | Jinan Shengquan Group Co., Ltd., Ji’nan, Shandong Province, 250200 | 250200 | | NI Shuzhen | State Key Lab of Biobased Materials and Green Papermaking, Qilu University of Technology （Shandong Academy of Sciences）, Ji’nan, Shandong Province,250353 | 250353 | | LI Qun | School of Light Industry Science and Engineering, Tianjin University of Science and Technology, Tianjin,300457 | 300457 | | WANG Zhaojiang* | State Key Lab of Biobased Materials and Green Papermaking, Qilu University of Technology （Shandong Academy of Sciences）, Ji’nan, Shandong Province,250353 | 250353 |
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| Abstract:In this study， chemical modification of organosolv lignin was carried out to synthesize lignin-based polyols and then prepared polyurethane foam. The structure of organosolv lignin was characterized. The prepared lignin-based polyols were tested for viscosity， acid value， hydroxyl value. The thermal conductivity， compressive strength， and apparent density of the synthesized bio-based foam were tested. The results showed that the hydroxyl value of lignin-based polyol was 920 mg KOH/g， and acid value was 4.76 mg KOH/g. Viscosity of lignin polyols decreased with temperature. Viscosity reduced from 15 832 mPa·s at 25 ℃ to 3 057 mPa·s at 80 ℃. The amount of isocyanate， foaming agent， and surfactant all affected compressive strength of polyurethane foam. Finally， the lignin-based polyurethane foam showed compressive strength of 370 kPa， density of 77 kg/m3， and thermal conductivity of 0.037 1 W/(m·K) under the optimal ratio. The foaming time was shortened from 320 s to 35 s by adjusting the acid value or catalyst dosage. |
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