两性改性淀粉的合成及其水煤浆分散性能研究  

Study on Amphoteric Modified Starch Synthesis and Its Dispersion Property of Coal Water Slurry

作　　者：朱妞 张光华[2] Zhu Niu;Zhang Guanghua(Xi′an Medical University,Xi′an Shaanxi 710021,China;Shaanxi University of Science and Technology,Xi′an Shaanxi 710021,China)

机构地区：[1]西安医学院,陕西西安710021 [2]陕西科技大学,陕西西安710021

出　　处：《煤化工》2020年第1期23-29,共7页Coal Chemical Industry

基　　金：国家自然科学基金(21176148)

摘　　要：以市售阳离子淀粉为原料,以过硫酸铵(NH4)2S2O8作为引发剂,分别加入苯乙烯磺酸钠(SSS)和丙烯酸(AA)、甲基丙烯磺酸钠(SMAS)和丙烯酸(AA)单体进行接枝共聚,制备出两种两性改性淀粉CSSAS和CSMAS。将其作为分散剂用于神华煤制浆,探讨两性改性淀粉分散剂对水煤浆制浆性能的影响。CSSAS分散剂的最佳用量为0.4%,制浆质量分数为65%,表观黏度为837 mPa·s,7 d析水率为4.7%,CSSAS在神华煤表面的饱和吸附量为2.36 mg/g;CSMAS分散剂的最佳用量为0.4%,制浆质量分数为65%,表观黏度为910 mPa·s,7 d析水率为5.2%,CSMAS在神华煤表面的饱和吸附量为2.25 mg/g。两性改性淀粉中的阳离子与神华煤表面的负电荷可以很好地吸附,提供更多吸附位点,在煤表面的吸附较为理想。结合神华煤的结构特点及分散特性,分析了吸附模型和吸附作用机理。Two amphoteric modified starches CSSAS and CSMAS were prepared by graft copolymerization of cationic starch with ammonium persulfate(NH4)2S2O8 as initiator,added with sodium styrene sulfonate(SSS)and acrylic acid(AA),sodium methacrylate sulfonate(SMAS)and acrylic acid(AA)monomers respectively.They were taken as dispersant used for Shenhua coal water slurry preparation,and the effect of amphoteric starch dispersant on the performance of coal water slurry was discussed.The optimum dosage of CSSAS was 0.4%,the pulping concentration was 65%,the apparent viscosity was 837 mPa·s,the saturated adsorption capacity was 2.36 mg/g,and the water evolution rate was 4.7%in 7 days;the optimum dosage of CSMAS dispersant was 0.4%,the pulping concentration was 65%,the apparent viscosity was 910 mPa·s,the saturated adsorption capacity was 2.25 mg/g,and the water evolution rate was 5.2%in 7 days.The cations in amphoteric modified starch and the negative charge on the surface of Shenhua coal showed good adsorption,providing more adsorption sites,so the adsorption on coal surface was quite good.Based on the structure and dispersion characteristics of Shenhua coal,the adsorption model and mechanism were analyzed.

关 键 词：改性淀粉 水煤浆 分散剂 流变特性 吸附模型 

分 类 号：TQ536.1[化学工程—煤化学工程]