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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 NameAffiliationPostcode
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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