Nano Metal Paste Preparation for Oxidation-Resistant Conductive Inks
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Solution Overview
Problem
Conductive pastes and inks face challenges due to the complexity of preparing conductive nanoparticles, which are prone to oxidation and agglomeration, leading to poor dispersion and conductive properties.
Innovation Solution
A method involving the use of organic metallic salts and organic reducing agents in water or organic solvents to prepare nano metal pastes, followed by concentration, which simplifies the process and ensures good dispersion and oxidation resistance of metal nanoparticles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive nanoparticles are dispersed in resin binder or solvent in powder form, then conductive paste or ink can be formed, but the metal nanoparticles are prone to oxidation and agglomeration, resulting in poor conductive properties
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing metal nanoparticles in an organic solvent system with added antioxidants before incorporation into the conductive paste or ink. This preliminary preparation prevents oxidation and agglomeration from occurring during subsequent storage and application, directly addressing the harmful factors identified in the contradiction.
2Ease of manufacture
If inorganic metal salts, inorganic reducing agents and inorganic solvents are used to prepare metal nanoparticles, then metal particles can be obtained, but repeated washing is required to prevent inorganic materials from mixing into the organic system, greatly exacerbating particle aggregation
Solution Approach 1:
The patent applies parameter changes by switching from inorganic to organic materials throughout the nanoparticle synthesis system. Specifically, organic metal salts, organic reducing agents, and organic solvents are used instead of their inorganic counterparts. This fundamental parameter change eliminates the need for repeated washing steps, as the organic synthesis system is compatible with the organic conductive paste or ink matrix, thereby simplifying the overall preparation process and reducing particle aggregation.
3Reliability
If metal nanoparticles are centrifuged, washed and dried multiple times, then inorganic contaminants can be removed, but the particle aggregation is greatly exacerbated
Solution Approach 1:
The patent applies parameter changes by using organic solvents and additives throughout the synthesis and formulation process, ensuring compatibility between the nanoparticle preparation system and the final conductive paste or ink system. This eliminates the need for multiple washing and re-dispersion cycles, thereby maintaining particle dispersion stability while achieving the required purity.
4Reliability
If conductive paste is prepared by adding conductive fillers to resin binder followed by curing or sintering, then conductive paste can be formed, but the preparation is complicated and the metal nanoparticles have poor dispersion
Solution Approach 1:
The patent applies merging by combining the nanoparticle synthesis and paste formulation into a single integrated process. Metal nanoparticles are synthesized directly in the organic solvent system containing the resin binder and other paste components, eliminating the need for separate synthesis, washing, drying, and re-dispersion steps. This merging of processes simplifies preparation while ensuring uniform dispersion and maintaining conductive performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in a nano metal paste that can be directly applied in conductive pastes and inks, with improved dispersion and conductivity, reducing the risk of oxidation and agglomeration, and simplifying the preparation process.
Implementation Method 1
adding an organic metallic salt and an organic reducing agent to a solvent to obtain a first mixture; reacting the first mixture under heating to obtain a second mixture containing metal nanoparticles
Data Source
AI summary
A method for preparing a nano metal paste, including the following steps. (S1) An organic metallic salt and an organic reducing agent are added into water or an organic solvent to obtain a first mixture. (S2) The first mixture is reacted under heating to obtain a second mixture containing metal nanoparticles. (S3) The second mixture is concentrated to obtain a nano metal paste containing 20-95% by weight of the metal nanoparticles. A conductive paste and A conductive ink prepared by using the nano metal paste as filler are also provided.