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丙烯酸系水煤浆添加剂的研究
【作者】 武成利;
【导师】 李寒旭;
【作者基本信息】 安徽理工大学 , 化工工艺, 2005, 硕士
【摘要】 本文以丙烯酸(AA)、丙烯酸甲酯(MA)、丙烯酰胺(AM)为共聚单体,以过硫酸铵和亚硫酸氢钠为氧化还原体系引发剂,异丙醇为链转移剂,采用水溶液聚合方法,合成了P(AA-MA)和P(AA-MA-AM)无规共聚物。 采用红外光谱、表面张力、热分析对共聚物的组成、结构、表面张力、玻璃化转变和失重进行了表征。用正交实验对聚合条件进行了优化,研究了各因素对共聚物的特性粘数的影响程度和趋势。 对共聚物用作水煤浆添加剂进行了研究,考查各共聚物在煤泥水煤浆中的制浆性能,得出各共聚物的最佳添加量和最大可制浆浓度;得出最佳聚合条件,二元聚合的最佳条件为:单体比例8:1,反应时间2.5h,反应温度60℃,过硫酸铵用量2%,亚硫酸氢钠用量6%;三元共聚的最佳条件为:单体比例为4:1:1,反应时间3h,反应温度80℃,过硫酸铵用量5%,亚硫酸氢钠用量4%。 通过X光电子能谱、透射电镜和红外光谱分析表明:共聚物能有效地吸附在煤粒表面,提高其亲水性,改变煤水体系的界面性质,使水煤浆更好地稳定分散。
【Abstract】 In this study, using acrylic acid (AA), methyacrylate (MA), acrylamide (AM) as monomers of copolymerization , ammonium persulfate and sodium bisulfite as redox system initiator, iso-propanol as chain transfer agent, random copolymers of P(AA-MA)and P(AA-MA-AM) are synthesized by means of aqueous solution copolymerization .The composition, structure, surface tension, glass transition, and thermal weight loss of copolymers are characterized by FT-IR, surface tension-meter and DSC-TG .Using orthogonal experiment, the polymerization conditions are optimized, the influence extents and trends of which on the intrinsic viscosity of copolymers are studied.Copolymers as additives of CWS are studied, the slurry-abilities of which in the CWS are investigated .The optimal dosages of copolymers and the maximal concentrations of CWS are given. Therefore, the optimal conditions of copolymerization are given. The optimal conditions of binary polymerization are molar ratio of monomers (AA:AM) 8:1, time of reaction 2.5h, temperature of reaction 60℃, dosage of ammonium persulfate 2%, dosage of sodium bisulfite 6%. The optimal conditions of terpolymerization are molar ratio of monomers (AA:AM:MA) 4: 1: 1, time of reaction 3h, temperature of reaction 80℃, dosage of ammonium persulfate 5%, dosage of sodium bisulfite 4%.Based on the analysis of XPS, TEM and FT-IR, the results show that copolymers are adsorbed effectively on the surface of coal particles ,their hydrophilicity is improved , thus interface properties of coal-water system are improved ,which makes CWS more stable and dispersible.
【Key words】 acrylic acid; methyacrylate; acrylamide; random copolymerization; additive of CWS;
- 【网络出版投稿人】 安徽理工大学 【网络出版年期】2005年 07期
- 【分类号】TQ536
- 【被引频次】3
- 【下载频次】490