Purpose

The interaction between the silver powder and organic vehicle largely determines the rheological behavior of silver conductive paste. This study aims to prepare silver conductive paste with an organic vehicle system consisting of ethyl cellulose (EC) and terpineol/butyl carbitol acetate solvent mixtures. The study also aims to measure the rheological behaviors of the silver conductive pastes with different solvent mixtures, EC molecular weights and silver content, to investigate the interaction among the polymer, solvent and silver powder and determine the main factors affecting the thixotropic index and maximum silver content.

Design/methodology/approach

The rheological behaviors of silver conductive pastes with different solvent mixtures, EC molecular weights and silver content were investigated using viscometer.

Findings

The shear thinning became significant with increasing EC molecular weight. The EC solvation with higher molecular weight in solvent is better than that of EC with lower molecular weight. This leads to a stronger interaction between the silver powder and EC with higher molecular weight and consequently good silver particle dispersion. The relative viscosity of silver conductive paste at 10 s⁻¹ increases significantly with increasing silver content, but the relative viscosity at 100 s⁻¹ is much less sensitive to the silver content. The viscosities at low and high shear rate can be increased by increasing the silver content and EC molecular weight, respectively.

Originality/value

The interaction among the polymer, solvent and silver powder was investigated for the silver paste with high solid content. The main factors affecting the viscosities at high and low shear rates, thixotropic index and maximum silver content were determined.

中文翻译：

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乙基纤维素银导电浆料的流变行为

目的

银粉和有机载体之间的相互作用在很大程度上决定了银导电胶的流变行为。这项研究旨在用有机载体体系制备银导电浆料，该体系由乙基纤维素（EC）和萜品醇/丁基卡必醇乙酸酯溶剂混合物组成。该研究还旨在测量不同溶剂混合物，EC分子量和银含量的银导电浆料的流变行为，研究聚合物，溶剂和银粉之间的相互作用，并确定影响触变指数和最大银含量的主要因素。内容。

设计/方法/方法

使用粘度计研究了不同溶剂混合物，EC分子量和银含量的银导电浆料的流变行为。

发现

剪切稀化随着EC分子量的增加而变得显着。在溶剂中具有较高分子量的EC溶剂化效果优于在较低分子量中的EC溶剂化效果。这导致具有较高分子量的银粉和EC之间的相互作用更强，因此银颗粒的分散性也更好。银导电糊剂在10 s ^-1时的相对粘度随银含量的增加而显着增加，但是100 s ^-1时的相对粘度对银含量的敏感度要低得多。通过分别增加银含量和EC分子量，可以提高低剪切速率和高剪切速率下的粘度。

创意/价值

对于高固含量的银浆，研究了聚合物，溶剂和银粉之间的相互作用。确定了影响高，低剪切速率下粘度，触变指数和最大银含量的主要因素。