Autodepositable Coating Formulation with Phosphated Monomers
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Solution Overview
Problem
Existing autodeposition compositions based on acrylic polymers for metal surfaces suffer from insufficient corrosion resistance, limited color variety, and loss of gloss, while requiring complex formulations and two-component systems.
Innovation Solution
An aqueous autodeposition composition comprising iron(III) ions, fluoride ions, a chain transfer agent, and an organic binder component with water-dispersible polymerizable (meth)acrylic acid and acrylated mono- or diphosphate ester compounds, which promotes rapid and homogeneous coagulation on metal surfaces, enhancing corrosion resistance and gloss retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If acrylic polymer-based binder components are used in autodeposition compositions, then the formulations are economically advantageous and simple, but the corrosion resistance and gloss retention are insufficient
Solution Approach 1:
The patent combines acrylic polymer components with phosphated monomers to create a composite binder system. This composite approach integrates the economic advantages and ease of application of acrylics with the superior corrosion resistance and adhesion properties of phosphated compounds, resolving the contradiction between formulation simplicity and corrosion protection effectiveness
Solution Approach 2:
The patent modifies the chemical composition parameters of the binder by incorporating specific phosphated monomers (such as phosphonic acid groups) into the acrylic polymer structure. This parameter change transforms the binder from a simple acrylic polymer to a functionally enhanced composite material that maintains processing simplicity while achieving adequate corrosion resistance
2Ease of manufacture
If acrylic polymer-based binder components are used in autodeposition compositions, then the formulations are economically advantageous and simple, but the gloss retention and block resistance are insufficient
Solution Approach 1:
The patent creates a composite binder system combining acrylic polymers with phosphated monomers. This composite structure provides both the application simplicity of acrylics and the gloss retention properties of phosphated compounds, as the phosphate groups enhance crosslinking density and film integrity, preventing gloss loss over time
Solution Approach 2:
The patent changes the chemical composition by incorporating phosphated functional groups into the binder system. This parameter modification increases the crosslinking density and thermal stability of the coating film, which directly improves gloss retention and block resistance while maintaining the economic advantages of acrylic-based formulations
3Object-affected harmful factors
If hydrofluoric acid-containing autodeposition compositions are used, then the pickling action is effective, but the bath stability is diminished and color variety is limited
Solution Approach 1:
The patent replaces the unstable hydrofluoric acid system with alternative pickling agents that provide effective metal surface preparation without the severe stability issues. This substitution maintains the pickling effectiveness needed for proper coating adhesion while extending bath life and enabling greater color variety
Solution Approach 2:
The patent changes the chemical composition by eliminating hydrofluoric acid and using alternative pickling mechanisms. This parameter change removes the source of bath instability and color limitations while maintaining effective metal surface preparation, allowing for more stable and versatile coating formulations
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 provides stable, malleable, and adherent coatings with prominent and permanent gloss, improved corrosion resistance, and a variety of colors, while maintaining economic advantages and simplifying formulations to single-component systems.
Implementation Method 1
coagulate directly on the surface of the component in a thin liquid layer upon contact with the metallic surface due to the pickling removal of metal cations
Implementation Method 2
aqueous dispersions of organic resins or polymers, which coagulate directly on the surface of the component
Implementation Method 3
Self-precipitating compositions, also referred to as autophoretic baths
Implementation Method 4
thermal treatment thereof induces final polymerization of the organic binder components
Implementation Method 5
which may be further promoted by curing agents
Data Source
AI summary
The present invention relates to an aqueous autodeposition composition comprising iron(II) ions, fluoride ions, at least one chain transfer agent and at least one dispersed organic binder component, wherein the organic binder component comprises at least one water-dispersible polymerizable (meth)acrylic acid component; and at least one acrylated mono- or diphosphate ester component.