Non-Water Reducible Polyester Anticrater Agent for Electrocoat
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cathodic electrocoating compositions often result in cratered finishes, which negatively impact the adhesion of subsequent coating layers, especially when cured without NOx in ovens.
Innovation Solution
Incorporation of a non-water reducible anticrater agent, a polyester reaction product of cyclic aliphatic carboxylic acid anhydride, monofunctional epoxy compound, monofunctional alcohol, and polyepoxy compound, into the electrocoating composition to reduce craters and improve smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional anticrater agents are used in electrocoating compositions, then crater formation is reduced, but adhesion of subsequent coating layers deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the anticrater agent by specifying a polyester formed from particular monomers (cyclic aliphatic carboxylic acid anhydride with 6-20 carbon atom side chains, monofunctional epoxy compound, monofunctional alcohol, and polyepoxy compound) that is non-water reducible. This specific compositional parameter change allows the agent to reduce craters while maintaining adhesion properties that conventional agents lack.
Solution Approach 2:
The invention creates a composite chemical system by formulating the anticrater agent as a polyester combination of multiple specific monomer types rather than using a single conventional anticrater compound. This composite structure provides both crater-reducing properties and compatible adhesion characteristics for subsequent coating layers.
2Use of energy by moving object
If electrocoating composition is cured in oven without NOx, then energy consumption is reduced, but adhesion of subsequent coatings deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the electrocoating system by incorporating the specific non-water reducible polyester anticrater agent, which modifies the curing behavior and surface properties. This allows the coating to achieve proper adhesion even when cured in energy-efficient ovens without NOx, eliminating the need for high-energy conventional curing processes.
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 non-water reducible anticrater agent significantly reduces crater formation and enhances the smoothness of the electrocoated film without compromising the adhesion of subsequent coatings.
Implementation Method 1
The coating of electrically conductive substrates by an electrocoating process
Implementation Method 2
An electric current is passed between the article and a counter-electrode in electrical contact with the aqueous emulsion, until a desired coating is deposited on the article
Data Source
AI summary
The present disclosure relates to an improved electrocoating coating composition wherein the improvement is the addition of a non-water reducible anticrater agent. The non-water reducible anticrater agent is a polyester that is the reaction product of an aliphatic carboxylic acid anhydride, a monofunctional epoxy compound, a monofunctional alcohol and a polyepoxide. The improved electrocoating composition provides cured coatings that have fewer craters and have a smooth surface when compared to coatings utilizing other anticrater additives.