以新疆棉区的棉杆资源为原料，采用水热法将棉杆中的木质素磺化改性为木质素磺酸钠，以磺化度作为标准判断改性程度。通过FT-IR、XPS、接触角、表面张力等手段对样品进行表征，确定产物的化学结构及表面性质。结果表明，利用水热法可以将磺酸基成功地接枝到棉杆木质素上，并且木质素磺酸钠具有典型的表面活性剂性质。同时考察了木质素磺酸钠对混凝土含气量、塌落度、微观结构和力学性能的影响，结果表明，木质素磺酸钠可以改善混凝土的孔隙结构。

Cotton stalks resources in Xinjiang cotton area are used as raw materials,the lignin in cotton stalks is sulfonated to prepare sodium lignosulfonate by hydrothermal method.The degree of sulfonation is taking as the index to judge the modification degree.The product samples are characterized by FT-IR,XPS,contact angle test,surface tension test and other means to determine their chemical structure and surface activity.It is shown that the sulfonate groups can be successfully grafted onto cotton lignin by using hydrothermal method,and sodium lignosulfonate has typical properties of surfactant.The effects of sodium lignosulfonate on the air content,slump,microstructure and mechanical properties of concrete are investigated.Results show that sodium lignosulfonate can improve the pore structure of concrete.

侯公伯(1995-),男,硕士研究生,主要从事混凝土外加剂的合成及混凝土应用的研究,namehou@163.com