Basic Copper Hydroxyl Phosphate (BCHP) is chosen for its ability to absorb NIR radiation and initiate localized thermal effects, which are essential for selective metallization in LDS processes. Its stability and crystalline structure make it an ideal additive in polymer-based systems.
Governing Mechanisms & Activation
Upon exposure to NIR light, BCHP undergoes electronic transitions that result in heat generation. This heat triggers the polymer surface to undergo chemical modifications, enabling selective metallization. The activation process is highly efficient in polymer matrices that are sensitive to heat and light.
Variables That Typically Matter
Laser wavelength: Around 1 µm, critical for optimal activation of BCHP.
Loading concentration: Ensures uniform activation across the matrix.
Polymer compatibility: BCHP is highly effective in halogenated polymers like PVC, where HCl evolution aids in smoke suppression.
Laser fluence: The energy delivered must be sufficient to activate BCHP without degrading the substrate.
Known Constraints & Failure Sensitivities
Non-Applicability:BCHP is ineffective in non-halogenated polymers where no HCl is released during processing.
Unknown/Unverified: Long-term stability in non-PVC matrices is still under investigation.
Activation Boundary:BCHP requires a minimum laser fluence of 10 J/cm² to effectively initiate the metallization process.
Data Confidence
The data presented is supported by peer-reviewed studies on the photothermal activation mechanisms of copper-based compounds under NIR irradiation.
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Application area
• Security printing and anti-counterfeiting inks
• Machine-readable barcodes and authentication marks
• Covert IR markings for brand protection
• Industrial and electronic component identification
• Packaging and label security systems