以棉杆木质素(LG)和丙酸酐(PA)为原料制备了酯化木质素(PA-L),探究不同掺量的LG和PA-L对苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青性能的影响。通过热重(TG),傅里叶变换红外光谱(FT-IR),接触角(OCA)等测试分析了LG改性前后的性能。利用三大指标分析了复合改性沥青的基本物理性能,使用动态剪切流变仪(DSR)对复合改性沥青进行温度扫描和多重应力蠕变恢复实验(MSCR)。结果表明:PA-L的改性是成功的,经改性后的PA-L疏水性和与沥青的相容性提升明显。PA-L提升了SBS改姓沥青的高温稳定性,对其低温抗裂性能弱化效果更小,其最佳掺量为5%。相较于LG,经改性后的PA-L热稳定性更好,掺入SBS改性沥青后硬度更大,各种指标变化更为线性,复数剪切模量(G*)更大,相位角更平缓,有着更佳的稳定性和抗车辙性能,以及更好的蠕变恢复能力。
Esterified lignin (PA-L) was prepared using cotton stem lignin (LG) and propionic anhydride (PA) as raw materials,and the effects of different dosages of LG and PA-L on the properties of SBS-modified asphalt were investigated.The performance of LG before and after modification was analyzed by thermogravimetric analysis (TG),Fourier transform infrared spectroscopy (FT-IR),and contact angle analyzer (OCA).The basic physical properties of the composite modified asphalt were analyzed using three major indicators,and temperature scanning and multiple stress creep recovery experiments (MSCR) were conducted on the composite modified asphalt using a dynamic shear rheometer (DSR).The results showed that the modification of PA-L was successful,and the hydrophobicity and compatibility with asphalt of the modified PA-L were significantly improved.PA-L improved the high-temperature stability of SBS-modified asphalt and had a smaller weakening effect on its low-temperature crack resistance.Its optimal dosage was 5%.Compared to LG,the modified PA-L had better thermal stability,greater hardness when blended into SBS-modified asphalt,more linear changes in various indicators,larger complex shear modulus (G*),smoother phase angle,better stability and rutting resistance,as well as better creep recovery ability.
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基金资助
新疆自治区青年基金项目(2023D01C194);新疆自治区昌吉州两区科技发展计划项目(2023LQG03)
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