The Influence of Organic Carrier Selection in Printing Silver Paste on the Final Printing Performance

As one of the important materials in modern electronic technology, printed silver paste is widely used in fields such as solar cells, printed circuit boards, touch screens, etc. Its performance depends not only on the quality and distribution of silver powder, but also greatly on the selection and formulation of organic carriers. This article will explore the role of organic carriers inPrinting silver pasteThe role of [insert function] and its impact on the final printing performance, and through reference data and comparative analysis, explain the specific manifestations of this impact.

1、 The role of organic carriers

Organic carriers mainly play the following roles in printing silver paste:

1. Adjusting viscosity and thixotropy: The formulation of organic carriers directly affects the viscosity and thixotropy of silver paste, which is a key factor affecting printing performance. A silver paste with appropriate viscosity and thixotropy can exhibit good printing performance during screen printing, ensuring the transfer accuracy of patterns.

2. Wetting and spreading: Organic carriers affect the wetting and spreading effect of the slurry on the substrate surface, which in turn affects the adhesive strength and density of the silver film.

3. Volatility and decomposition: During the sintering process, the organic carrier decomposes and evaporates, and its volatility and decomposition temperature directly affect the final performance of the silver film.

2、 Organic carrier components and properties

Organic carriers are usually composed of organic solvents, surfactants, leveling agents, and thixotropes. The following is a typical organic carrier formula example:

• Solvent: 60wt% turpentine alcohol
• Plasticizer: 15wt% diethylene glycol dibutyl ether, 15wt% tributyl citrate
• Other additives: 10wt% dibutyl phthalate

The selection and ratio of these ingredients directly affectsilver pasteLiquidity, viscosity, and thixotropy. For example, pine oil alcohol, as the main solvent, has good volatility and solubility; Diethylene glycol dibutyl ether and tributyl citrate as plasticizers can adjust the viscosity of silver paste and improve its printing performance.

3、 The influence of organic carriers on printing performance

1. Viscosity and thixotropy:

   • Viscosity: Moderate viscosity is beneficial for improving the printing performance of silver paste. Excessive viscosity can lead to uneven printing, while low viscosity can cause flow phenomenon. For example, it is found in the study that the viscosity of silver paste increases with the increase of the content of BYK-381 thixotropic agent. When the content increases from 2wt% to 5wt%, the volume resistivity of the silver electrode changes from 14.0 × 10-3 Ω· cm, which is due to the gel phenomenon of the organic carrier, which leads to the deterioration of the screen printing performance of silver paste.

   • Thixotropy: Thixotropy affects the flow and recovery properties of the slurry. Good thixotropy can maintain the stability of the paste during the printing process, preventing flow and collapse.

2. Wetting and spreading:

   • The type and proportion of organic carriers affect the wetting and spreading properties of the slurry on the substrate surface. For example, ethyl cellulose (EC), as an adhesive, helps improve printing performance due to its shear thinning properties. Research has shown that organic carriers with different levels of EC have a significant impact on the rheological behavior and printing performance of silver paste.

3. Volatility and decomposition:

   • The volatility and decomposition temperature of organic carriers directly affect the final performance of silver films. Excessive volatility can lead to the collapse and cracking of the silver film, while a low decomposition temperature may result in residual organic compounds, affecting the conductivity and adhesion of the silver film.

4、 Research Platinum Brand YB8604 Line Printing Silver Paste

Produced by Advanced Institute (Shenzhen) Technology Co., LtdResearch Platinum Brand YB8604 Line Printing Silver PasteFor example, the silver paste has excellent printing performance and conductivity.

• Viscosity: Moderate, able to meet the requirements of high-precision screen printing.
• Thixotropy: Good, ensuring the stability of the paste and the transfer accuracy of the pattern during the printing process.
• Wetting and spreading: It exhibits good wetting and spreading properties on various substrates, with strong adhesion to the substrate.
• Volatility and decomposition: During the sintering process, the organic carrier decomposes and evaporates completely, leaving no residual organic matter, ensuring the conductivity and adhesion of the silver film.

5、 Data comparison and analysis

The following is a performance comparison between YB8604 printed silver paste and other types of conductive silver paste from Yanbo brand:

• Conductivity: YB8604 silver paste has a higher conductivity than ordinary silver alloy conductive silver paste and is close to the level of pure silver conductive silver paste, ensuring good conductivity.
• Viscosity: YB8604 silver paste has a moderate viscosity, is easy to print, and the printed pattern is uniform without obvious flow or collapse.
• Tensile strength: YB8604 silver paste has high tensile strength, strong adhesion to the substrate, and is not easy to peel off.
• Hardness: YB8604 silver paste has moderate hardness, good wear resistance, and is not easily scratched.
• Thermal conductivity and heat resistance:YB8604 silver pasteIt has high thermal conductivity, good heat dissipation performance, and good heat resistance, and can maintain stable performance in high temperature environments.

6、 Conclusion

The selection and formulation of organic carriers have a significant impact on the final printing performance of silver paste. By optimizing the composition and ratio of organic carriers, the viscosity, thixotropy, wetting and spreading properties, as well as volatilization and decomposition characteristics of silver paste can be significantly improved, thereby enhancing the printing performance and conductivity of silver paste. The YB8604 line printing silver paste produced by Advanced Institute (Shenzhen) Technology Co., Ltd. has achieved excellent printing performance and conductivity through a reasonable organic carrier formula, providing strong support for the development of the electronics industry.
The above data is for reference only, and specific performance may vary due to production processes and product specifications.