分散剂对石墨水悬浮液分散性能的影响  

Dispersibility of graphite in water with different dispersants

作　　者：王丽丽[1] 于锦[1] 李正元[1] 

机构地区：[1]沈阳工业大学理学院,辽宁沈阳110870

出　　处：《新型炭材料》2016年第1期92-96,共5页New Carbon Materials

基　　金：辽宁省高等学校研究项目专项资金(20060616)~~

摘　　要：通过测定分散体系的吸光度,探讨不同浓度的各种分散剂对石墨水悬浮液分散性能的影响,其中添加含有阴离子型、非离子型和高分子表面活性剂的三种复配分散剂(SGDF1、SGDF2、SGDF3)的石墨水悬浮液分散效果较好。进一步研究在复配分散剂存在下,pH值、静置时间对石墨水悬浮液性能的影响。结果表明,当pH值大于7后,石墨水悬浮液的分散能力维持在较高水平,pH值为9时,Zeta电位绝对值最高,吸光度最大,分散体系稳定性最好。添加分散剂的石墨较未添加分散剂的石墨聚集程度明显减弱,分散性能变好。其中添加SGDF3的石墨水悬浮液的石墨的聚集程度最小,分散稳定最佳。Octaphenyl polyoxyethyiene （OP-10）, polyoxyethylene sorbitan monolaurate （Tween 20）, sodium alcohol ether sul- phate （AES）, carboxymethylcellulose sodium （CMC）, polyethylene glycol （PEG） 6000 and their mixtures were used to disperse graphite in water and their dispersion performance was investigated by spectrophotometry and Zeta potential measurements. Results indicate that three dispersant mixtures, （a） SGDF1 containing 100 g/L AES, 30 g/L Tween 20 and 20 g/L OP-10, （b） SGDF2 containing 100 g/L AES, 10 g/L Tween 20 and 20 g/L PEG-6000, and （c） SGDF3 containing 100 g/L AES, 10 g/L Tween 20 and 20 g/L CMC, have a good dispersibility for graphite in water. When the pH value is higher than 7, the dispersant mixtures have improved dispersibility. When the pH value is over 9, the Zeta potential of the graphite suspensions are high and their stability is the best. SGDF3 has the best dispersibility among all dispersants investigated.

关 键 词：石墨 分散剂 吸光度 

分 类 号：TQ127.11[化学工程—无机化工]