Coated Article Weather Resistance via Titanium Oxide Distribution
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Solution Overview
Problem
Conventional powder coating materials with titanium oxide exhibit insufficient weather resistance, and forming a cured film with good weather resistance using existing methods is cumbersome, especially when a two-coating process is required.
Innovation Solution
A coated article is formed using a powder coating material comprising a fluorinated polymer, a polyester polymer, an ultraviolet absorber, and titanium oxide, with a specific atom concentration profile and distribution of titanium oxide, and an ultraviolet absorber, to create a cured film that is excellent in weather resistance without the complexity of multi-coating processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluororesin type powder coating material is used to improve weather resistance, then the cured film achieves good weather resistance, but the cost increases and the process becomes more complex
Solution Approach 1:
The patent combines fluororesin and polyester resin in a single powder coating material formulation, allowing both materials to be applied in one coating process. The fluororesin component provides the weather resistance while the polyester resin provides cost effectiveness and good adhesion to the substrate, eliminating the need for separate coating steps
Solution Approach 2:
The invention creates a composite powder coating material containing both fluororesin and polyester resin with specific compositional ratios. This composite formulation allows the cured film to exhibit both the superior weather resistance of fluororesin and the cost advantages of polyester resin, while achieving good adhesion and overall performance
2Reliability
If a two-coating process is used with polyester resin and fluororesin to achieve good weather resistance, then the cured film has excellent weather resistance, but the process becomes cumbersome and productivity decreases
Solution Approach 1:
The patent merges the functions of two separate coating materials (polyester resin and fluororesin) into a single integrated powder coating material. This allows the coating process to be completed in one application and curing step, significantly improving productivity while maintaining the weather resistance benefits of fluororesin and the adhesion benefits of polyester resin
3Strength
If titanium oxide is added to the powder coating material to improve durability, then the cured film gains enhanced durability, but the weather resistance becomes insufficient due to photocatalytic reactions
Solution Approach 1:
The patent uses the fluororesin component as an intermediary protective layer that surrounds and isolates the titanium oxide particles. This fluororesin matrix prevents direct contact between titanium oxide and environmental factors, suppressing photocatalytic reactions while still allowing the titanium oxide to provide durability benefits such as hardness and scratch resistance
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 weather-resistant cured film with titanium oxide, ensuring the film's durability and resistance to environmental factors while simplifying the coating process, as the ultraviolet absorber effectively protects the polyester layer from degradation and the titanium oxide is strategically distributed to prevent photocatalytic reactions.
Implementation Method 1
an ultraviolet absorber (D)... the proportion of the ultraviolet absorber (D) contained in the above region (I) (100 mass%) as obtained by the following method (3) is from 0.5 to 10 mass%
Implementation Method 2
a powder coating material comprising a fluorinated polymer (A), a polyester polymer (B)... which has a cured film of the above powder coating material
Data Source
AI summary
To provide a coated article, in which formation of a cured film having a fluororesin layer and a polyester layer is not cumbersome, and the cured film is excellent in weather resistance. A coated article having a cured film formed by coating a substrate with a powder coating material comprising a fluorinated polymer (A), a polyester polymer (B), an ultraviolet absorber (C) and titanium oxide (E), wherein the thickness of the cured film is from 20 to 1,000µm, the atom number concentration of Ti element present in a region (I) within 5µm in depth from the surface of the cured film is from 0 to 9%, the atom number concentration of Ti element present in a region (II) beyond 10µm in depth from the surface of the cured film is from 8.5 to 10%, and the proportion of the ultraviolet absorber (D) contained in the region (I) (100 mass%) is from 0.5 to 10 mass%.