Multilayer Coating Film Simultaneous Curing for White Metallic Luster
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Solution Overview
Problem
Existing methods for forming metallic coating films result in poor white metallic luster due to low lightness in the highlight and insufficient water resistance and adhesion.
Innovation Solution
A multilayer coating film is formed by applying a base paint, an effect pigment dispersion containing aluminum flake pigment, light-scattering particles, and a hydroxy-containing acrylic resin, followed by a clear paint, and then curing all layers simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metallic paint containing flake-effect aluminum powder and titanium oxide powder is applied, then metallic luster is achieved, but white metallic luster with high lightness in highlight is insufficient
Solution Approach 1:
The patent applies different functional layers with specific compositions: the base coating film provides adhesion and uniformity, the effect coating film with aluminum flake pigment and light-scattering particles creates the metallic luster and high lightness in highlight, and the clear coating film protects the metallic effect. This local differentiation of functions and compositions achieves both high highlight lightness and overall white metallic luster quality
Solution Approach 2:
The patent uses composite material compositions in each layer: the base paint contains specific resins and pigments for adhesion, the effect pigment dispersion combines aluminum flake pigment with light-scattering particles (titanium oxide, zinc oxide, etc.) to enhance light reflection and scattering, and the clear paint provides protective properties. These composite materials work together to achieve superior white metallic luster with high highlight lightness
2Reliability
If conventional metallic coating methods are used, then coating formation is achieved, but water resistance and adhesion are insufficient
Solution Approach 1:
The patent incorporates adhesion promoters and specific resin compositions in the base paint and effect pigment dispersion that pre-establish strong bonding capabilities before the final curing process. The base coating film is formulated with materials that inherently provide excellent adhesion to the substrate, and the simultaneous curing process ensures all layers bond together effectively, achieving superior water resistance and adhesion without requiring additional intermediate steps
Solution Approach 2:
The patent combines multiple functions into the simultaneous curing process: adhesion development, water resistance formation, and inter-layer bonding all occur in one unified curing step. This merging of functions achieves comprehensive reliability improvement while maintaining manufacturing simplicity, as the single curing operation accomplishes what would otherwise require multiple separate treatment steps
3Reliability
If multiple coating layers are applied sequentially, then coating film formation is achieved, but curing time and process complexity increase
Solution Approach 1:
The patent merges the curing of three distinct coating films (base coating film, effect coating film, and clear coating film) into a single simultaneous curing process. All layers are cured together in one heating step, eliminating the need for separate curing cycles between layers. This reduces total curing time and process complexity while maintaining the quality benefits of a multilayer structure
Solution Approach 2:
The simultaneous curing process maintains continuous useful action by curing all coating layers in one uninterrupted operation. The heating process acts on all three layers concurrently, ensuring continuous development of adhesion, water resistance, and protective properties throughout the entire coating system, rather than interrupting for separate curing steps
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 achieves high lightness from the highlight to the bottom, providing excellent white metallic luster, adhesion, and water resistance.
Implementation Method 1
light-scattering particles (B)
Implementation Method 2
a hydroxy-containing acrylic resin (C)
Implementation Method 3
heating the uncured base coating film, the uncured effect coating film, and the uncured clear coating film formed in steps (1) to (3) to simultaneously cure these three coating films
Data Source
AI summary
Provided is a method for forming a multilayer coating film including the following steps (1) to (4): (1) applying a base paint (X) to a substrate to form a base coating film; (2) applying a specific effect pigment dispersion (Y) to the base coating film formed in step (1) to form an effect coating film with a specific dry film thickness; (3) applying a clear paint (Z) to the effect coating film formed in step (2) to form a clear coating film; and (4) heating the uncured base coating film, the uncured effect coating film, and the uncured clear coating film formed in steps (1) to (3) to simultaneously cure these three coating films.