Conductive Ink Photopolymerization at Room Temperature
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Solution Overview
Problem
Existing conductive inks require high temperatures and long periods for production, do not provide sufficient conductivity, and generate waste, necessitating the development of conductive inks with increased conductivity and environmentally friendly methods at room temperature.
Innovation Solution
A method involving the synthesis of nanocomposite polymer material with nano-sized silver particles (AgNp) using a radical photo-initiator, silver nitrate, and polyvinyl alcohol under ultraviolet light at room temperature, followed by precipitation and viscosity adjustment with alcohol, to produce conductive inks suitable for various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional conductive ink production methods are used, then production can be performed with existing processes, but high temperatures and long periods are required
Solution Approach 1:
The patent replaces thermal energy input (heating) with photochemical energy input (UV light irradiation). The photopolymerization reaction is initiated by UV light absorbing molecules, converting optical energy directly into chemical reaction energy, thereby eliminating the need for high-temperature thermal processing while achieving polymerization and conductive ink formation.
Solution Approach 2:
The patent changes the energy input parameter from thermal (temperature) to photochemical (UV light wavelength and intensity). By controlling UV light exposure parameters instead of temperature parameters, the process achieves polymerization at room temperature, resolving the contradiction between ease of manufacture and high temperature requirements.
2Productivity
If conventional conductive ink production methods are used, then production can proceed with standard timelines, but long periods are required
Solution Approach 1:
The patent employs periodic UV light irradiation to initiate and control the photopolymerization reaction. By using intermittent or controlled-duration UV exposure, the reaction proceeds rapidly through defined stages, significantly reducing the overall production time compared to continuous thermal processing while maintaining product quality.
Solution Approach 2:
Photochemical reactions typically proceed much faster than thermal reactions at equivalent energy inputs. The direct activation of polymerization by UV light eliminates the need for prolonged thermal incubation, thereby increasing productivity while reducing production time.
3Reliability
If conventional conductive ink methods are used, then existing materials can be employed, but sufficient conductivity is not achieved
Solution Approach 1:
The patent creates a composite structure where conductive particles are embedded within a polymer matrix formed by photopolymerization. This composite approach allows the polymer to provide structural integrity and adhesion while the conductive particles (such as silver, carbon, or metal oxides) provide electrical conductivity, achieving high reliability without requiring excessive amounts of expensive conductive material.
Solution Approach 2:
The patent applies conductive materials locally at specific positions where conductivity is needed, rather than uniformly distributing them throughout the entire ink formulation. The photopolymerization process allows for precise spatial control, enabling conductive pathways to be formed only where required, thereby improving conductivity efficiency while reducing overall conductive material consumption.
4Ease of manufacture
If conventional conductive ink production is used, then standard procedures can be followed, but waste is generated
Solution Approach 1:
The patent utilizes the phase transition from liquid monomer to solid polymer through photopolymerization. This direct phase change allows for precise control of material transformation, minimizing material loss and waste generation. The UV-cured ink dries rapidly without requiring high-temperature evaporation that would otherwise cause solvent loss and environmental pollution.
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 resulting conductive inks exhibit 100 times higher conductivity than alternatives, reduce production costs, and are environmentally friendly, enabling applications in flexible electronics and smart tags.
Implementation Method 1
converting said initial solution into nanocomposite polymer material containing nano-sized silver particles (AgNp) by ultraviolet light
Implementation Method 2
precipitating said nanocomposite material and obtaining the conductive ink with the desired viscosity by adding alcohol thereon
Data Source
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AI summary
The present invention relates to a method for producing conductive inks, comprising 5 the steps of; preparing an initial solution containing a radical photoinitiator, silver nitrate, acrylamide, and polyvinyl alcohol (i), converting said initial solution into nanocomposite polymer material containing nano-sized silver particles by ultraviolet light (ii), precipitating said nanocomposite material and obtaining the conductive ink with the desired viscosity by adding alcohol thereon (iii), all of which are carried out at 0 room temperature.