高分辨率丝印低温银浆的制备

研究了有机载体中溶剂、树脂、触变剂和银粉含量对低温银浆印刷分辨率的影响。结果表明，不同载体的树脂、溶剂和触变剂对银浆的印刷性有很大影响，银粉的含量对浆料的电性能直接相关。优选的以二价酸酯(38.5%)为溶剂、饱和聚酯(10%)为载体、聚酰胺蜡(0.5%)为触变剂、片状银粉(51%)制备出的低温银浆印刷分辨率高。浆料性能如下：粘度为36.5 Pa·s、触变指数为26.8，在PET、PC、ITO等基材上，用于印刷线宽为100μm时，在x轴和y轴方向扩边率均小于10%，方阻12 m?/□，满足高分辨率精密印刷的要求。

Preparation of High-Resolution Screen-printing Low-temperature Silver Paste

The effects of solvent, resin, thixotropic agent and silver content on printing resolution of a low temperature silver paste were investigated. Resin, solvent and thixotropic agent had great influence on printing performance of the paste while silver content was directly related to the conductivity. The optimized formula of silver paste consisted of DBE (38.5%) as solvent, saturated polyester resin(10%) as vehicle, polyamide wax (0.5%) as thixotropic agent, and silver flake powder (51%) displayed a high printing resolution. The thixotropic index and viscosity of the paste were 26.8 and 36.5 Pa·s, respectively. After the paste was printed on PET, PC and ITO substrates with a line width of 100 μm in less than 10% broadening deviation on bothx andy direction, the sheet resistance was measured to be 12 m?/□, meeting the requirements for high resolution fine printing.