添加剂对鳞片石墨在水介质中分散性能的影响

以鳞片石墨在水介质中的沉降率和分散率作为评价指标,研究了7种添加剂单独以及复合添加对鳞片石墨在水介质中分散性能的影响。结果表明:十二烷基苯磺酸钠和十二烷基硫酸钠对石墨在液相中的分散效果显著,分散率分别为97.8%和80.0%,0.5h时的沉降率分别为92.0%和94.0%,但稳定性不好;通过正交试验方法得出最佳添加剂配方,即十二烷基硫酸钠添加量为4.7%(质量分数,下同),N-乙酰-L-脯氨酸添加量为3.7%和磷酸三丁酯添加量为2.6%,按该最佳配方添加时鳞片石墨在水介质中的分散率达到99.2%,1h时的沉降率为92.0%;在用最佳配方制备的银-石墨复合镀层中,鳞片石墨已被均匀分散在银层中。

Effect of Additive on Dispersibility of Flake-Graphite in Aqueous Medium

The sedimentation rate and the dispersion rate of flake-graphite in aqueous medium were taken as evaluation criteria.The effects of individual addition of seven additives and composite addition on the dispersibility of flake-graphite in aqueous medium were investigated.The results show that sodium dodecyl benzene sulfonate and lauryl sodium sulfate have evident dispersion effect to flake-graphite in aqueous medium,achieving dispersion rates of 97.8％ and 80.0％,the sedimentation rate of 92.0％ and 94.0％ in 0.5 hour,respectively,but stability of sedimentation was not ideal.The optimum formula of additive,lauryl sodium sulfate addition of 4.7％ (mass),N-acetyl-L-proline addition of 3.7％ (mass) and tributyl phosphate addition of 2.6％ (mass),was obtained by orthogonal desigr.The dispersion rate was 99.2％ and the sedimentation rate in 1 hour was 92.0％ when using the optimum fomula.Flake-graphite in the silver-graphite composite coating prepared by the optimum formula dispersed uniformly.