Alkyd Resin Hardness via Non-Toxic Metal-Thiol Driers
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Solution Overview
Problem
Cobalt-based driers in alkyd coatings are carcinogenic and do not provide sufficient hardness, limiting their use in demanding applications, while alternatives like Borchi Oxy-Coat offer faster curing but result in softer coatings, necessitating a non-toxic agent that enhances hardness and drying speed without heat or radiation.
Innovation Solution
Incorporating small multifunctional thiols or polythiols into oxidatively curable solvent-based coating compositions, specifically with primary driers containing transition metal ions and polydentate amine ligands, to increase coating hardness and reduce drying time, excluding cobalt-based driers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cobalt-based driers are used in alkyd coatings, then the coating achieves high cross-link density and hardness, but the coating becomes carcinogenic and toxic
Solution Approach 1:
The patent removes cobalt-based driers from the coating system and replaces them with alternative non-cobalt driers (such as manganese, iron, or zinc-based driers) that provide similar curing functionality without the carcinogenic properties. This extraction of the harmful component while maintaining the essential curing function resolves the contradiction between hardness and toxicity.
Solution Approach 2:
The patent changes the chemical composition parameters of the drier system by substituting cobalt compounds with alternative metal compounds (manganese, iron, zinc) that have different toxicological profiles. This parameter change maintains the catalytic curing activity while eliminating or reducing the carcinogenic harmful factors.
2Productivity
If Borchi Oxy-Coat is used as a cobalt alternative, then the coating dries faster and shows less yellowing, but the coating becomes softer with lower scratch resistance
Solution Approach 1:
The patent combines multiple drier components in a synergistic system that merges the fast-drying capability of Borchi Oxy-Coat with additional agents or complementary driers that enhance cross-link density. This combination allows the coating to achieve both rapid drying and improved hardness, resolving the trade-off between productivity and strength.
Solution Approach 2:
The patent creates a composite drier system that integrates Borchi Oxy-Coat with other catalytic components or resin modifications to achieve properties that neither component provides alone. This composite approach enables simultaneous fast drying and high hardness by leveraging the complementary characteristics of multiple materials.
3Strength
If cobalt-based driers are used, then the coating achieves high cross-link density, but the coating requires additional heat or radiation for curing
Solution Approach 1:
The patent employs drier systems that enable the coating to cure through self-oxidation using atmospheric oxygen, eliminating the need for external heat or radiation energy input. The drier catalyzes the oxidation of unsaturated fatty acids in the alkyd resin using ambient air, providing a self-sustaining curing process that achieves high cross-link density without additional energy consumption.
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
Significantly improves coating hardness and drying speed, outperforming cobalt-based driers and maintaining fast curing, while being non-toxic and suitable for various coating applications.
Implementation Method 1
Incorporating small multifunctional thiols or polythiols into oxidatively curable solvent-based coating compositions
Implementation Method 2
primary driers, typically metal carboxylates like cobalt neodecanoate, are used to catalyze the oxidative drying (curing) of alkyd resins
Implementation Method 3
oxidative drying (curing) of alkyd resins
Data Source
AI summary
The invention pertains generally to a process and resulting product of following the steps of the process involving adding an Iron- or Manganese- or Vanadium- or Copper- in combination with a multidentate ligand to form a metal-ligand complex with a thiol or polythiol to an alkyd resin, said steps performed in any order or the synthesis performed in-situ.