分散体系对微米银粉微观形貌及粒径影响研究

发布时间：2018-01-13 01:00

  本文关键词：分散体系对微米银粉微观形貌及粒径影响研究　出处：《稀有金属》2017年02期 　论文类型：期刊论文

  更多相关文章： 化学还原法 球形银粉 乳液分散 W/O 分散机制

【摘要】：微米及亚微米级球形银粉具有良好的导电性,在太阳能电池正面银浆料中应用广泛。利用化学还原法制备球形银粉是目前主要的制备方法之一,但制备的银粉存在分散性差,粒径分布宽的缺点。因此为制备粉体粒径分布范围窄、球形度良好且分散性好的银粉,本实验在化学还原法基础上,选用聚乙二醇(PEG-6000)和乳液分散两种不同的分散体系制备球形银粉。以聚乙二醇为分散剂制备银粉,主要改变分散剂含量、反应温度、反应液pH值等制备因素,而以乳液作为分散剂制备银粉时,主要改变表面活性剂含量、O/W比(油/水比)和乳液的HLB值(亲水亲油平衡值)。通过调整制备条件比较银粉的粒径分布、球形度。发现利用聚乙二醇制备银粉在分散剂含量为7%、温度为50℃、pH为9时分散度较好,但是球形度较差,平均粒径在1.59μm;利用乳液法制备银粉时在分散剂含量为3%、乳化转速为11000 r·min-1、W/O比为1∶1、HLB=4.5时粉体分散度较好,且粉体球形度好,平均粒径为0.91μm。分析实验结果发现,利用乳液法制备的银粉粒径分布均一、球形度良好,且分散性明显提高。
[Abstract]:Micrometer and submicron spherical silver powder have good electrical conductivity and are widely used in solar cell silver paste. The preparation of spherical silver powder by chemical reduction method is one of the main preparation methods at present. However, the silver powder has the disadvantages of poor dispersion and wide particle size distribution. Therefore, in order to prepare silver powder with narrow particle size distribution, good sphericity and good dispersion, the experiment is based on chemical reduction method. Polyethylene glycol (PEG-6000) and emulsion dispersion systems were used to prepare spherical silver powder and polyethylene glycol was used as dispersant to prepare silver powder, which mainly changed the content of dispersant and reaction temperature. When silver powder was prepared with emulsion as dispersant, the content of surfactant was mainly changed. The O / W ratio (oil / water ratio) and the HLB value of emulsion (hydrophilic hydrophilic equilibrium value). The particle size distribution of silver powder was compared by adjusting the preparation conditions. Spherical degree. It was found that the dispersant content of silver powder prepared by polyethylene glycol was 7, the temperature was 50 鈩，

本文编号：1416741