Electrocoats with Triazine Crosslinkers for Impurity Tolerance
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Solution Overview
Problem
Existing cathodically depositable electrodeposition coating materials are sensitive to impurities such as phosphates and metal salts, leading to film defects and inadequate corrosion control, and require high baking temperatures, resulting in high energy consumption and economic inefficiencies.
Innovation Solution
A cathodically depositable electrodeposition coating material comprising an epoxide-amine adduct, pigment/filler, and a crosslinking agent with at least 25 wt % tris(alkoxycarbonylamino)-1,3,5-triazine, which reduces sensitivity to impurities and allows for lower baking temperatures without compromising optical or mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional crosslinking agents are used in electrodeposition coating materials, then the coating achieves adequate corrosion control, but the coating material shows high sensitivity to impurities such as phosphates and metal salts, leading to film defects
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the crosslinking agent from conventional types to tris(alkoxycarbonylamino)-1,3,5-triazine compounds. This structural parameter change fundamentally alters the reactivity and interaction characteristics of the crosslinking agent with impurities like phosphates and metal salts, thereby reducing sensitivity to these harmful factors while maintaining corrosion control performance
Solution Approach 2:
The patent employs composite materials by combining the epoxide-amine adduct binder with tris(alkoxycarbonylamino)-1,3,5-triazine crosslinking agents. This composite binder system creates a synergistic effect where the triazine crosslinking agent provides impurity tolerance while the epoxide-amine adduct maintains film integrity and corrosion protection, resolving the contradiction between reliability and sensitivity
2Reliability
If high baking temperatures are used to ensure adequate curing, then the coating achieves sufficient crosslinking and corrosion control, but energy consumption increases significantly
Solution Approach 1:
The patent applies parameter changes by utilizing the unique chemical properties of tris(alkoxycarbonylamino)-1,3,5-triazine crosslinking agents that enable effective crosslinking at lower temperatures. The molecular structure and reactivity of these triazine compounds allow the curing process to proceed efficiently at reduced temperatures, thereby achieving adequate curing quality with significantly lower energy consumption compared to conventional high-temperature baking
Solution Approach 2:
The patent applies mechanics substitution by replacing the thermal energy-intensive curing mechanism with a chemically-driven crosslinking mechanism. The tris(alkoxycarbonylamino)-1,3,5-triazine crosslinking agents provide enhanced chemical reactivity that enables effective crosslinking through chemical affinity rather than relying solely on high thermal energy input, thus substituting thermal processing with chemical processing to reduce energy consumption
3Ease of manufacture
If conventional electrodeposition coating materials are used, then the process is economically efficient, but the coating shows inadequate resistance to solvent and weathering
Solution Approach 1:
The patent employs composite materials by formulating a binder system that combines epoxide-amine adducts with tris(alkoxycarbonylamino)-1,3,5-triazine crosslinking agents. This composite structure creates a crosslinked network with enhanced solvent and weathering resistance while maintaining economic efficiency through cathodic electrodeposition application. The synergistic interaction between the binder components delivers superior durability properties without sacrificing manufacturing economy
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 coating material achieves sufficient curing and corrosion control with reduced sensitivity to impurities and lower baking temperatures, ensuring good solvent resistance and weather resistance while minimizing energy consumption.
Implementation Method 1
a cathodically depositable aqueous electrodeposition coating material comprising at least one epoxide-amine adduct (a), at least one pigment and/or at least one filler (b), and at least one crosslinking agent (c), a fraction of at least 25 wt % of the crosslinking agent (c), based on the total weight of the crosslinking agent (c), being formed by at least one tris(alkoxycarbonylamino)-1,3,5-triazine
Implementation Method 2
a method for coating an electrically conductive substrate by cathodic electrodeposition coating using said electrodeposition coating material
Data Source
AI summary
The present disclosure relates to a cathodically depositable aqueous electrodeposition coating material including at least one epoxide-amine adduct (a), at least one pigment and/or at least one filler (b), and at least one crosslinking agent (c), a fraction of at least 25 wt % of the crosslinking agent (c), based on the total weight of the crosslinking agent (c), being formed by at least one tris(alkoxycarbonylamino)-1,3,5-triazine; to a method for coating an electrically conductive substrate by cathodic electrodeposition coating using said electrodeposition coating material; to a substrate coated accordingly; and also to a use of a tris(alkoxycarbonylamino)-1,3,5-triazine in a cathodically depositable electrodeposition coating material for reducing or eliminating the sensitivity to disruption of the electrodeposition coating bath toward impurities present therein through phosphates and/or through other metal salts which have been carried into the electrodeposition coating bath as a result of pretreatment steps ahead of the electrodeposition coating.