Automotive Paint Composition for Chipping Resistance and Flip-Flop
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Solution Overview
Problem
Existing automobile paint compositions fail to achieve a balance between small graininess, high flip-flop property, and excellent chipping resistance and adhesion, particularly under varying climatic conditions and impact peeling phenomena.
Innovation Solution
A paint composition comprising a hydroxy group-containing acrylic resin, a hydroxy group-containing polyester resin, an amino resin, and a titanium oxide-coated light interference pigment, with specific ratios and properties, is used in a multilayer coating film formation method involving basecoat and clearcoat steps to form a durable and aesthetically pleasing coating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a basecoat film is formed by coating with a basecoat material containing a scale-like titanate pigment, then chipping resistance is improved, but flip-flop property and adhesiveness may not be sufficient
Solution Approach 1:
The patent uses a composite pigment system combining scale-like titanate pigment with plate-like mica pigment in specific weight ratios (titanate: 10-40 wt%, mica: 60-90 wt%). This composite approach allows the titanate to provide chipping resistance while the mica maintains flip-flop property and adhesiveness, resolving the contradiction between durability and reliability
Solution Approach 2:
The patent specifies precise L* value parameters for the pigment composition (L*15 ≥ 100, L*110 ≤ 65) and controls the weight ratio parameters of different pigments. By optimizing these parameters, the coating achieves both high chipping resistance and sufficient adhesiveness simultaneously
2Illumination intensity
If a coating film has high flip-flop property with significant brightness difference between high-light and shade regions, then aesthetic property is improved, but graininess may increase
Solution Approach 1:
The patent utilizes the anisotropic optical properties of plate-like mica pigment, where the crystal structure reflects light differently based on viewing angle. This local optical quality variation creates high flip-flop effect while the plate-like structure itself provides a smooth surface that minimizes graininess when properly oriented
Solution Approach 2:
The patent employs pigments with specific light reflection characteristics that change with viewing angle (L*15 ≥ 100, L*110 ≤ 65). This optical color change phenomenon creates the metallic flip-flop appearance while the controlled pigment morphology prevents graininess
3Reliability
If a coating film has high adhesion under various climatic conditions including water presence, then durability is improved, but complexity of achieving consistent performance increases
Solution Approach 1:
The patent develops a basecoat composition that universally performs multiple functions: the scale-like titanate pigment provides chipping resistance, the plate-like mica pigment provides flip-flop effect and adhesion, and the resin system provides climate resistance. This multi-functional composition achieves consistent performance across various climatic conditions without requiring complex separate systems
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 solution provides a coating film with improved chipping resistance, adhesion, and flip-flop property, maintaining aesthetic appeal even under impact and varying climatic conditions, while ensuring durability and smooth appearance.
Implementation Method 1
a titanium oxide-coated light interference pigment (D), which has an L*15 value of 100 or more and an L*110 value of 65 or less
Implementation Method 2
when viewed in a state close to perpendicular to the coating plate (high-light), the texture shines
Data Source
AI summary
To provide a paint composition capable of forming a coating film having a small graininess, having high flip-flop property, and having excellent chipping resistance and adhesion. According to the present invention, there is provided a paint composition including a hydroxy group-containing acrylic resin (A), a hydroxy group-containing polyester resin (B), an amino resin (C), and a titanium oxide-coated light interference pigment (D), which has an L*15 value of 100 or more and an L*110 value of 65 or less, wherein the solid content of the hydroxy group-containing acrylic resin (A) is in the range of 20 to 60 parts by mass, the solid content of the hydroxy group-containing polyester resin (B) is in the range of 10 to 50 parts by mass, the solid content of the amino resin (C) is in the range of 5 to 40 parts by mass, and the solid content of the titanium oxide-coated light interference pigment (D) is in the range of 3 to 25 parts by mass, relative to 100 parts by mass of the total solid content of the hydroxy group-containing acrylic resin (A), the hydroxy group-containing polyester resin (B), and the amino resin (C).