Conductive Pattern Blackening via Acid Mixture
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Solution Overview
Problem
Existing methods for blackening conductive patterns in EMI shielding films are inefficient, requiring lengthy processing times and increasing sheet resistance, which affects the ability to shield electromagnetic interference and reduces productivity and increases production costs.
Innovation Solution
A method involving immersion of conductive patterns in an aqueous solution containing reducing metal ions, such as Fe or Cu, to oxidize the surface and form chlorine salt crystals, reducing sheet resistance and enhancing blackening, using printing methods like offset printing to form conductive patterns on substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If concentrated nitric acid is used for blackening processing of the conductive pattern, then the surface can be blackened, but the processing time becomes too long and sufficient blackness cannot be obtained
Solution Approach 1:
The patent changes the chemical parameters of the blackening solution by using a mixture of nitric acid and hydrochloric acid in specific proportions (1:3 to 1:10), and controls the immersion time (1-10 seconds). This parameter optimization achieves sufficient blackness while dramatically reducing processing time compared to using concentrated nitric acid alone.
Solution Approach 2:
The patent uses a composite chemical solution combining nitric acid and hydrochloric acid. This composite approach creates a more effective blackening medium that works faster and more efficiently than nitric acid alone, resolving the contradiction between processing speed and blackening effectiveness.
2Ease of manufacture
If concentrated nitric acid is used for blackening processing, then the conductive pattern can be blackened, but the sheet resistance increases
Solution Approach 1:
By optimizing the acid concentration ratio and immersion time, the patent achieves blackening while minimizing damage to the conductive pattern. The controlled parameters ensure that the metal surface is oxidized sufficiently for blackness without excessive etching that would increase sheet resistance.
Solution Approach 2:
The patent replicates the effective blackening action of concentrated nitric acid while using a diluted, controlled acid mixture that produces the same visual effect (blackness) without the harmful side effect of excessive sheet resistance increase.
3Ease of manufacture
If conventional blackening methods are used, then the conductive pattern surface can be treated, but the productivity decreases and production cost increases
Solution Approach 1:
The patent dramatically reduces processing time from minutes to seconds (1-10 seconds immersion), and optimizes solution composition. This enables high-speed production while maintaining blackening quality, directly improving productivity and reducing production costs.
Solution Approach 2:
The patent rushes through the blackening process by using a highly effective acid mixture that achieves the desired result in just 1-10 seconds, skipping the lengthy processing times required by conventional methods and thereby dramatically improving production efficiency.
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 effectively reduces sheet resistance, enhances conductance, and improves blackening efficiency, thereby increasing productivity and reducing production costs while maintaining effective electromagnetic interference shielding.
Implementation Method 1
blackening the surface of the conductive pattern by immersing the conductive pattern in an aqueous solution containing reducing metal ions to oxidize the surface of the conductive pattern
Implementation Method 2
immersing the conductive pattern in an aqueous solution containing reducing metal ions to oxidize the surface of the conductive pattern
Implementation Method 3
immersing the conductive pattern in an aqueous solution containing reducing metal ions
Data Source
AI summary
The present invention provides a method for preparing a conductive pattern, comprising a pattern forming step of forming a conductive pattern on a substrate; and a blackening processing step of blackening the surface of the conductive pattern by immersing the conductive pattern in an aqueous solution containing reducing metal ions to oxidize the surface of the conductive pattern, and a conductive pattern prepared therefrom.