【摘要】 采用水溶液自由基共聚法制备了腐殖酸-烯丙基磺酸钠接枝共聚物(HAS),并通过FT-IR和XRD对其进行了结构表征.将HAS和传统的萘磺酸甲醛缩合物(SNF)分散剂应用于神木煤的制浆,考察了浆体的表观黏度和静态稳定性.研究表明,HAS的应用性能优于SNF,在HAS用量为0.6wt%时,水煤浆(成浆浓度为63wt%)黏度为392mPa·s,168h的析水率为4.47;测定了HAS和SNF在煤表面的物理化学性质,结果表明,HAS在煤表面呈现明显多层吸附特征,吸附量比SNF大,XPS分析也说明了这一点.HAS能更有效地降低水在煤表面的接触角,这表明HAS对煤具有良好的润湿作用.此外,HAS在煤表面的zeta电位绝对值也比SNF略小.更多还原

【Abstract】 A new type of humic acid graft copolymer(HAS)was synthesized by means of water solution free radical copolymerization,and characterized by FT-IR and XRD.HAS was applied as a dispersant for the coal-water slurry(CWS)prepared from Chinese Shenmu coal. The application performance investigations show that,compared with a commercial dispersant-sulfonated naphthalene-formaldehyde condensate(SNF),HAS has better ability in lowering viscosity and strengthening stability for CWS,and the slurry(coal content=63wt% and dispersant concentration=0.6wt%)exhibits 392mPa·s of apparent viscosity,while the syneresis ratio remains 4.74within 168hours.The physicochemical property investigations show that,HAS exhibits the multilayer adsorption model on coal surface,its adsorption amount is much larger than that of SNF,Which is proved by XPS examination.Compared with SNF,HAS can more effectively decrease the contact angle of the water on coal surface, which suggests a better ability in wetting the coal.However,in the case of HAS,the zeta potential absolute value of coal surface is slight low.更多还原