Silver Nanoparticle Dispersion Binder for Low-Temperature Sintering
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Solution Overview
Problem
Current metallic nanoparticle dispersions for conductive inks face challenges with poor adhesion to various substrates and require high sintering temperatures, which can damage common polymer foils like PET, and may cause printing quality issues due to surface roughness and sticking problems during screen printing.
Innovation Solution
A silver nanoparticle dispersion comprising silver nanoparticles, a binder copolymer of vinyl chloride and vinyl alcohol, and a liquid carrier, with optional surfactants and adhesion-promoting compounds, which improves adhesion and allows for lower sintering temperatures, enabling conductive coatings on flexible substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high sintering temperatures are used to decompose polymeric dispersants, then conductivity of applied patterns is improved, but common polymer foils like PET are damaged
Solution Approach 1:
The patent changes the decomposition temperature parameter of the polymeric dispersant by selecting specific polymers with lower decomposition temperatures (below 300°C), enabling sintering at reduced temperatures that do not damage PET substrates while still achieving adequate conductivity
Solution Approach 2:
The patent uses composite material strategies by combining metallic nanoparticles with specifically selected polymeric dispersants that have complementary properties - the polymer provides stabilization and adhesion while its controlled decomposition at lower temperatures enables substrate compatibility
2Stability of the object's composition
If polymeric dispersants with full decomposition temperature of at least 350°C are used, then stability of metallic nanoparticle dispersion is improved, but sintering temperature must be elevated
Solution Approach 1:
The patent modifies the decomposition temperature parameter of the polymeric dispersant from the conventional ≥350°C to below 300°C by selecting specific polymers, creating a new parameter regime that enables low-temperature sintering while maintaining dispersion stability through alternative molecular structures
3Reliability
If high sintering temperatures and longer sintering times are used, then decomposition of organic components is improved, but manufacturing cost and process time increase
Solution Approach 1:
The patent changes the temperature parameter to lower values (below 300°C) which paradoxically reduces the required sintering time by selecting polymers that decompose more rapidly at these temperatures, thereby reducing both time and energy costs while achieving complete decomposition
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 solution provides stable, conductive coatings with improved adhesion to diverse substrates and reduced sintering temperatures, allowing for the use of flexible substrates like PET and maintaining conductivity, while preventing printing quality issues.
Implementation Method 1
a binder which is a copolymer of vinyl chloride and vinyl alcohol
Implementation Method 2
a sintering step, also referred to as curing step, at elevated temperatures is carried out to induce/enhance the conductivity
Data Source
AI summary
A metallic nanoparticle dispersion comprising metallic nanoparticles, a binder and a liquid carrier, characterized in that the binder is a copolymer of vinyl chloride and a hydroxyfunctional monomer.