Iron Manganese Drier Composition for Alkyd Coatings
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Solution Overview
Problem
There is a need to improve the drying performance of non-cobalt primary drier compositions in air-drying alkyd resin coatings, particularly at low temperatures, as alternative driers based on iron or manganese complexes do not match the activity of cobalt salts in terms of drying speed or through hardening.
Innovation Solution
Combining iron- and manganese ligand complexes with potassium carboxylates to create a drier composition that includes a metal complex with nitrogen donor ligands and a potassium salt of an organic acid, enhancing the drying activity of alkyd-based coating compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If iron or manganese complexes are used as alternative driers to cobalt salts, then environmental compliance and cost are improved, but drying speed and through hardening performance deteriorate
Solution Approach 1:
The patent combines iron or manganese complexes with specific nitrogen-containing ligands (such as bipyridine, phenanthroline, or their derivatives) to create a synergistic drier system. This merging of components enhances the catalytic activity of the metal complex, enabling non-cobalt driers to achieve drying speeds comparable to cobalt salts while maintaining environmental compliance.
Solution Approach 2:
The invention modifies the chemical parameters of the drier system by introducing organic ligands with nitrogen donors that alter the electronic and steric properties of the metal center. This parameter change increases the catalytic efficiency of iron or manganese complexes, transforming them from slow-acting alternatives into high-performance driers that match cobalt-based systems.
2Object-affected harmful factors
If iron or manganese complexes are used as alternative driers to cobalt salts, then environmental compliance is improved, but through hardening performance deteriorates
Solution Approach 1:
The patent merges iron or manganese complexes with multidentate nitrogen-containing ligands to form stable yet catalytically active complexes. This combination enables the alternative drier system to achieve reliable through hardening performance, matching the reliability of cobalt-based driers while avoiding the environmental and health issues associated with cobalt.
3Productivity
If conventional drier compositions are used, then drying performance is maintained, but environmental and health concerns increase
Solution Approach 1:
The patent replaces toxic cobalt-based driers with environmentally benign iron or manganese complexes. While iron and manganese are naturally occurring and less toxic metals, the invention enhances their performance through ligand design, creating effective driers that are both environmentally friendly and economically viable without relying on hazardous materials.
Solution Approach 2:
The invention changes the chemical composition parameters by substituting cobalt with iron or manganese and introducing organic ligands to compensate for any activity differences. This parameter substitution and optimization maintains drying performance while eliminating the environmental and health concerns associated with cobalt exposure.
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
This combination achieves a significant reduction in drying time, comparable to cobalt-based driers, especially at low temperatures, and improves both surface and through drying performance.
Implementation Method 1
the chemical conversion of alkyd resins is habitually catalyzed by salts of metal ions as catalytic oil drying agents
Implementation Method 2
the binder polymers undergo autoxidation and subsequently form cross-links between the polymer chains
Implementation Method 3
drying accelerators are organic ligands that are able to increase the activity of primary drier metals causing a more rapid drying of the coating film
Implementation Method 4
the drying process starts by solvent evaporation
Data Source
AI summary
The invention relates to a drier composition for an oxidatively air-drying alkyd based coating composition, comprising: a) at least one metal complex comprising a metal and at least one nitrogen donor ligand, wherein the metal is selected from the group consisting of Fe and Mn, and wherein said at least nitrogen donor ligand is selected from the group comprising monodentate, bidentate, tridentate, tetradentate, pentadentate and hexadentate nitrogen donor ligands; and b) at least one K salt of an organic acid. The present invention also relates to a coating composition comprising said drier composition and the use thereof.