White Catalyst Coating for Selective Metallization
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Solution Overview
Problem
Conventional methods for selectively metallizing plastic substrates are limited as they use colored chemical plating catalysts, which cannot satisfy the requirement for white products, and often result in poor adhesion of the metal layer to the substrate.
Innovation Solution
A method involving a coating composition with a solvent, adhesive, and catalyst precursors like ZnSnO3 and ZnTiO3, which are white, allowing for selective metal layer formation on predetermined regions through chemical plating, ensuring good adhesion and meeting the demand for white products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional chemical plating catalysts are used, then metal layer formation is achieved, but the catalysts are colored (black, gray, brown, yellow, green) which cannot satisfy the requirements for white products
Solution Approach 1:
The patent applies preliminary action by using a white catalyst precursor that is applied to the substrate before the actual catalytic conversion process. The precursor is then converted in situ to the active catalyst form through gasification or other activation methods, ensuring the substrate maintains its white appearance while still achieving effective metal layer formation.
Solution Approach 2:
The patent changes the chemical parameter of the catalyst from a colored compound to a white precursor compound. By controlling the activation conditions (such as gasification parameters), the precursor is transformed into the active catalyst form only when needed, allowing the substrate to remain white during application and handling while maintaining catalytic functionality.
2Strength
If conventional methods are used for selective metallization, then metal layer is formed, but the adhesion of metal layer to substrate is poor
Solution Approach 1:
The white catalyst precursor acts as an intermediary substance that facilitates both the adhesion of the metal layer and the maintenance of white appearance. The precursor is applied to the substrate, then converted in situ to the active catalyst, which then promotes metal deposition with good adhesion while the precursor itself maintains the white appearance during the process.
3Shape
If white catalyst precursor is used, then white product appearance is achieved, but the catalyst precursor must be transformed into active catalyst through gasification
Solution Approach 1:
The patent replaces complex mechanical catalyst application systems with a chemical approach where the white precursor is applied and then transformed in situ through gasification. This substitution allows the catalyst to be activated only where and when needed, simplifying the overall process while maintaining white appearance.
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 enables the production of white products with a metal layer on specific regions, achieving good adhesion to the insulating substrate and reducing production costs due to the availability of ZnSnO3 and ZnTiO3 catalysts, while maintaining the inherent properties of the substrate.
Implementation Method 1
gasifying a predetermined region of the white coating layer so that the catalyst precursor is exposed and transformed into a catalyst
Implementation Method 2
a coating composition including: a solvent, an adhesive, and at least one selected from ZnSnO3 and ZnTiO3 as a catalyst precursor
Implementation Method 3
a coating composition including: a solvent, an adhesive, and at least one selected from ZnSnO3 and ZnTiO3 as a catalyst precursor
Implementation Method 4
the catalyst precursor is exposed and transformed into a catalyst; and forming a metal layer on the predetermined region by chemical plating
Data Source
AI summary
A coating composition, a composite prepared by using the coating composition and a method for preparing the composite are provided. The coating composition includes a solvent, an adhesive, and a catalyst precursor including at least one selected from a group consisting of SnO2, ZnSnO3 and ZnTiO3.