不同分子量磺化丙酮-甲醛缩聚物在煤上的吸附及水煤浆流变性能  

Effects of molecular weight of sulphonated acetone-formaldehyde polymer on its adsorption and rheological properties of coal-water slurry

作　　者：张光华[1] 李元博[1] 朱军峰[1] 王睿[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2015年第1期79-84,98,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(21176148;21303098);陕西省教育厅重点实验室科研计划项目(2011JS020);陕西省科技厅自然科学基金项目(2014JM2040)

摘　　要：以丙酮、甲醛及亚硫酸钠为原料,采用磺化缩聚法,通过控制缩合时间和温度合成了一系列具有不同分子量的磺化丙酮-甲醛(SAF)水煤浆分散剂,并对其分子结构进行了表征,证明了它是一个含有磺酸基和羟基亲水基团的脂肪族柔性链高分子.同时研究了它们对彬长煤的吸附和水煤浆流变性能的影响,并与萘系进行了对比.结果表明,相对分子量适中(Mw=38 541)的SAF-2对水煤浆的分散降黏性最好,其分散性和稳定性均优于萘系分散剂;通过吸附等温线的测定,得出SAF在彬长煤上呈Langmuir单分子层吸附,且SAF分子量越小,其吸附能力K越大,吸附量也越大;用Herschel-Bulkley模型对浆体流变曲线进行拟合,发现不同分子量的SAF水煤浆体都呈现"剪切变稀"的流变特性,为假塑性流体,且分子量适中的SAF-2流动指数最大,吸附量与水煤浆流动性密切相关.A water-soluble aliphatic polycondensate,sulfonated acetone-formaldehyde（SAF）was prepared by sulfonation and polycondensation reations using acetone,formaldehyde and sodium sulfite as raw material.Characterized its structure,it was a containing sulfonic acid groups and hydroxyl hydrophilic aliphatic flexible chain polymer.The effects of molecular weight of SAF on its adsorption behaviors and rheological property in CWS were investigated.The results show that,the relative molecular weight is moderate（Mw=38 541）,SAF-2is best for reducing viscosity on the coal-water slurvy,dispersibility and stability are better than naphthalene dispersants.Adsorption results show that all the adsorption isotherms of SAF and NSF on coal surface are belonging to Langmuir monolayer adsorption.With the increase of molecular weight,the adsorption amounts on coal surface decrease.The rheological properties of different SAF were fitted by using the Herschel-Bulkley model.The results showed all rheological properties of CWS that added different molecular weight SAF were the shear thinned and pseudoplastic fluids.The adsorption capacity was closely related to the liquidity of CWS.

关 键 词：磺化丙酮-甲醛缩聚物 相对分子质量 水煤浆 流变 吸附 

分 类 号：TQ536.9[化学工程—煤化学工程]