Multilayer Coating Film Low-Temperature Curing Method
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Solution Overview
Problem
Existing methods for forming multilayer coating films on automotive panels face challenges in achieving low-temperature curing while maintaining performance, especially in integrating metal and plastic members, and achieving high flip-flop properties for aesthetic enhancement.
Innovation Solution
A method involving sequential application of an aqueous 2-package first colored paint, an aqueous 1-package white paint, an aqueous 1-package interference color paint, and a solvent-based 2-package clear paint, followed by simultaneous curing at 75 to 100°C, utilizing specific resin compositions and titanium oxide-coated synthetic mica to achieve a whitish multilayer coating film with enhanced designability and lightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 3-coat 2-bake system is used to ensure coating performance, then the finished appearance and water resistance are improved, but the energy consumption and facility cost increase
Solution Approach 1:
The patent merges the curing process of multiple coating layers into a single bake step. The clear paint and base paint are formulated to both cure simultaneously at 100-120°C, eliminating the need for separate bake cycles and achieving both energy savings and maintained coating performance
Solution Approach 2:
The patent changes the curing temperature parameter to enable low-temperature simultaneous curing. By formulating paints that cure at 100-120°C instead of higher temperatures, the system achieves energy reduction while maintaining coating film quality and performance
2Use of energy by moving object
If the baking temperature is reduced to save energy, then the energy consumption decreases, but the finished appearance and water resistance deteriorate
Solution Approach 1:
The patent formulates the clear paint and base paint with curing agents and resins specifically designed to cure at low temperatures (100-120°C). This parameter change in curing temperature enables energy reduction while maintaining complete cure and coating performance
Solution Approach 2:
The patent uses composite material formulations combining hydroxyl-containing acrylic resins with polyisocyanate curing agents. This composite system enables low-temperature crosslinking and curing that maintains coating film durability, water resistance, and appearance quality
3Use of energy by moving object
If a 3-coat 1-bake system is used to reduce energy consumption, then the energy cost decreases, but the coating film performance and integrated painting quality become insufficient
Solution Approach 1:
The patent merges the curing of the clear paint and base paint into a single bake step at 100-120°C. This simultaneous curing approach maintains the quality of integrated painting while achieving energy reduction, resolving the contradiction between energy savings and manufacturing precision
Solution Approach 2:
The patent applies the clear paint over the uncured base paint, allowing both layers to cure simultaneously in one bake cycle. This preliminary arrangement of layers enables synchronized curing that maintains coating quality while reducing energy consumption
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 produces a multilayer coating film with excellent low-temperature curing properties, high lightness in highlight, significant flip-flop effect, and improved designability on both metal and plastic automotive panels, ensuring a smooth, water-resistant, and aesthetically appealing finish.
Implementation Method 1
heating the uncured first colored coating film, the uncured white coating film, the uncured interference color coating film, and the uncured clear coating film formed in the steps (1) to (4) at 75 to 100°C so as to simultaneously cure these coating films
Data Source
AI summary
A method for forming a multilayer coating film, sequentially conducting step (1) of applying an aqueous 2-package type first colored paint (X) on both a metal member and a plastic member of an automobile outer panel to form an uncured first colored coating film; step (2) of applying an aqueous 1-package type white paint (Y-1) on the uncured first colored coating film by step (1) to form an uncured white coating film; step (3) of applying an aqueous 1-package type interference color paint (Y-2) on the uncured white coating film by step (2) to form an uncured interference color coating film; step (4) of applying a solvent-based 2-package type clear paint (Z) on the uncured interference color coating film by step (3) to form an uncured clear coating film; and step (5) of heating these coating films by steps (1) to (4) at 75 to 100°C to simultaneously cure them.