Silver Paste Coated with Fatty Acid for Stable Polar Dispersion
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Solution Overview
Problem
Conventional conductive pastes using organic solvents for nano-sized metal particles face issues with ventilation requirements, combustion treatment, waste disposal, and unstable particle size, as well as poor redispersibility in polar solvents, which affect industrial productivity and environmental impact.
Innovation Solution
A composition of silver particles coated with a linear fatty acid, such as hexanoic acid, dispersed in a polar solvent like water or alcohol, which allows for stable existence and easy redispersion, enabling efficient production and use in electronic device applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional conductive pastes using organic solvents are used, then the paste can be applied to form conductive patterns, but ventilation requirements, combustion treatment, and waste disposal issues arise due to organic solvent use
Solution Approach 1:
The patent changes the solvent parameter from organic to polar (water-based), eliminating the need for ventilation, combustion treatment, and special waste disposal while maintaining paste applicability for conductive pattern formation
Solution Approach 2:
The patent uses water as a replacement for expensive and hazardous organic solvents, creating a safer, more environmentally friendly conductive paste that does not require special handling infrastructure
2Manufacturing precision
If nano-sized metal particles are used to improve pattern precision and electrical conductivity, then fine line formation and conductivity improve, but particle size stability and redispersibility in polar solvents deteriorate
Solution Approach 1:
The patent introduces a polar solvent mediator that stabilizes nano-sized metal particles and enables their redispersibility, allowing fine line formation precision to be maintained while solving particle stability issues
Solution Approach 2:
The patent creates a composite conductive paste system combining nano-sized metal particles with polar solvent and appropriate additives, achieving both fine line precision and particle stability through material composition optimization
3Ease of operation
If conventional organic solvent-based conductive pastes are used, then the paste can be stored and applied, but poor redispersibility in polar solvents affects industrial productivity
Solution Approach 1:
The patent changes the solvent system parameter to polar-based, fundamentally improving redispersibility and enabling better industrial productivity while maintaining ease of storage and application
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 composition provides fine silver particles with improved stability, redispersibility, and increased mass productivity, reducing environmental impact and operational costs while maintaining high electrical conductivity.
Implementation Method 1
the linear fatty acid adheres to the surface of the silver particles
Implementation Method 2
metal fine particles formed by reduction of metal ions in an aqueous phase
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
A composition containing fine silver particles which have a uniform particle size, can form a fine drawing pattern, and have a small environmental impact, a method for producing that composition, a method for producing fine silver particles, and a paste having fine silver particles are provided. The fine silver particles are produced by carrying out a fluid preparation step of preparing a reduction fluid, a silver reaction step, and a filtration/washing step. The reaction step is carried out by adding an aqueous silver nitrate fluid to a reduction fluid whose temperature has been increased to a range between 40 and 80°C. The aqueous silver nitrate fluid is added at a stretch. The composition containing fine silver particles is produced by dispersing the composition containing the fine silver particles in a polar fluid.