Aqueous Coating Composition with Phosphoric Acid Compound
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Solution Overview
Problem
Aqueous coating compositions for vehicles face challenges in achieving excellent smoothness, distinctness of image, metallic feel, and preventing metallic mottling, while maintaining water resistance and storage stability, especially when containing effect pigments.
Innovation Solution
An aqueous coating composition comprising acrylic resin particles, a water-soluble acrylic resin, and a phosphoric acid compound with a specific formula, which acts as a surfactant and curing catalyst, improving wettability and preventing reactions between metal powders and water, thus enhancing the orientation and stability of effect pigments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aqueous coating compositions are used to reduce VOC emissions, then environmental pollution is reduced, but coating film smoothness and distinctness of image deteriorate
Solution Approach 1:
The invention changes the chemical parameters of the aqueous coating composition by incorporating specific phosphoric acid compounds with controlled molecular structures (where m=1 or 2, n=0-20, and specific R1/R2 groups). This modifies the coating formulation to achieve both environmental compliance and high-quality film formation with excellent smoothness and distinctness of image.
2Object-affected harmful factors
If aqueous coating compositions containing effect pigments are used, then environmental pollution is reduced, but metallic feel and flip-flop property deteriorate
Solution Approach 1:
The invention modifies the chemical environment in which effect pigments are suspended by adding specific phosphoric acid compounds. This changes the interfacial properties and dispersion characteristics, enabling effect pigments to orient properly and exhibit excellent metallic feel and flip-flop properties while maintaining the environmental benefits of aqueous formulations.
3Object-affected harmful factors
If conventional aqueous coating compositions are used, then VOC emissions are reduced, but water resistance and storage stability deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating phosphoric acid compounds with specific structural parameters (m, n, R1, R2 values). These compositional changes enhance the crosslinking density and network structure of the coating film, resulting in improved water resistance and storage stability while maintaining the environmental advantages of aqueous 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 composition achieves excellent storage stability, smoothness, distinctness of image, and metallic feel without metallic mottling, while providing a coating film with improved water resistance and curability.
Implementation Method 1
a phosphoric acid compound with a specific formula, which acts as a surfactant
Implementation Method 2
improving wettability
Implementation Method 3
a phosphoric acid compound with a specific formula, which acts as a surfactant and curing catalyst
Implementation Method 4
preventing reactions between metal powders and water
Data Source
AI summary
The problem to be solved by the present invention is to provide an aqueous coating composition having an excellent finished appearance, such as smoothness and distinctness of image, as well as metallic feel and no metallic mottling when the composition comprises an effect pigment; excellent coating film performance, such as water resistance; and excellent storage stability. The present invention provides an aqueous coating composition comprising (A) acrylic resin particles, (B) a water-soluble acrylic resin, and (C) a phosphoric acid compound represented by a specific formula and having hydrocarbon (and optionally polyoxyalkylene); and also provides a method for forming a coating film, comprising applying the aqueous coating composition, as well as an article coated with the aqueous coating composition.